JP6920601B2 - Papermaking equipment - Google Patents

Description

The present invention relates to a papermaking apparatus.

Conventionally, it has not been possible to produce a wet paper by making a pulp suspension in a paper making section, dehydrating the generated wet paper and transferring it to a drying section, and drying the wet paper in a drying section to produce a dry paper. It was done.

In Patent Document 1 below, a pulp suspension is made by a mesh belt, the generated wet paper is pressure-transferred from the mesh belt to a smooth surface belt, and the wet paper on the smooth surface belt is heated and dried. .. Further, in Patent Document 2 below, the pulp suspension is made with a papermaking wire, the generated wet paper is contact-transferred to the dehydration belt, and the wet paper is pressure-transferred from the dehydration belt to the drying belt. The wet paper conveyed by the drying belt is heated and dried.

Japanese Unexamined Patent Publication No. 2011-32604 Japanese Unexamined Patent Publication No. 2011-69015

However, in the apparatus shown in Patent Document 1, when the wet paper is transferred from the mesh belt to the smooth surface belt, it is squeezed by a press roll and a dehydration roll, and the water squeezed out on the lower surface of the wet paper is the mesh belt. It quickly escapes downward from the mesh of the belt. However, since the water squeezed out on the upper surface of the wet paper is prevented from escaping upward by the smooth surface belt, the pulp fibers of the wet paper are pushed away and moved to the lower surface side of the wet paper. Therefore, the texture of the wet paper may be deteriorated. Further, the heated smooth surface belt reaches the dehydration roll portion in a state where the temperature is sufficiently higher than room temperature. Therefore, since the reticulated belt comes into direct contact with the heated smooth surface belt in the region where the wet paper does not exist, the durability of the reticulated belt is low unless the reticulated belt is made of a material having excellent heat resistance. .. Further, in the apparatus shown in Patent Document 2, the dehydration belt is made of a water-absorbent material such as felt, and the papermaking wire and the drying belt are made of a mesh-like member. In some cases, it does not worsen the formation. Further, since the papermaking wire and the drying belt do not come into direct contact with each other, the durability of the papermaking wire can be maintained high. However, since the dehydration belt is a water-absorbent material, when fine pulp fibers and the like contained in the absorbed water accumulate in the dehydration belt and become clogged, the wet paper is transferred from the dehydration belt to the drying belt. It becomes difficult and it becomes easy for transfer mistakes to occur.

The present invention solves the above problems, and an object of the present invention is to provide a papermaking apparatus capable of preventing a decrease in the durability of a papermaking belt and efficiently delivering wet paper from a papermaking section to a drying section. And.

In order to solve the above problems, the papermaking apparatus of the present invention is a papermaking apparatus including a papermaking section for making a pulp suspension and producing wet paper, and a drying section for drying wet paper to produce paper. The papermaking section is provided with an endless papermaking belt, and has a peeling section from which the front end of the wet paper is peeled off from the papermaking belt. The drying section includes a paper-making return path that circulates at the beginning of the paper-making outward path after contact with the paper, and the drying section is between a heating carrier that transports wet paper while heating it on a heating surface and the heating carrier. It has a holding belt for holding and transporting wet paper, and the drying portion receives the wet paper peeled from the papermaking belt at the peeling portion on the holding belt or the heated surface of the heat carrier. A receiving portion is provided, and the papermaking belt is provided at a predetermined distance from the receiving portion. Further, the papermaking apparatus of the present invention is a papermaking apparatus including a papermaking unit for producing wet paper by making a pulp suspension and a drying unit for drying wet paper to produce paper. The papermaking belt is provided with an endless papermaking belt, and has a peeling portion from which the front end of the wet paper is peeled off from the papermaking belt. The drying section includes a receiving section that receives the wet paper peeled from the paper making belt at the peeling section, and a heating surface that heats the wet paper received at the receiving section. The papermaking belt is provided at a predetermined distance from the receiving portion.

In addition to the above contents, the present invention can further include the following configurations.

(A) The papermaking section is provided in the middle of the papermaking outbound route and includes a dehydrating section for dehydrating wet paper.

(B) The papermaking belt has a curved traveling portion that is hung on a plurality of support rollers and travels in a curved manner along the support roller located at the end of the papermaking outbound route, and the peeling portion has the curved traveling portion. It is provided in the section.

(C) In the curved traveling portion, the papermaking belt has a predetermined radius of curvature that can be peeled off from the papermaking belt in which the front end of the wet paper is curved and traveled by the waist of the wet paper.

(D) The drying portion includes an endless holding belt that sandwiches and conveys the wet paper received by the receiving portion with the heating carrier.

(E) before Symbol receiving portion is provided at a position lower than the final contact position where the paper belt finishes contacting with the wet paper.

(F) The heating carrier has the receiving portion, and the receiving portion is provided at a position lower than the final contact position where the papermaking belt ends contact with the wet paper.

(G) A gap is provided between the peeling portion and the receiving portion, and the distance of the gap is set to be equal to or less than the thickness of the front end of the wet paper in the peeling portion.

(H) A delivery portion is provided between the papermaking portion and the drying portion so that the front end of the wet paper peeled from the papermaking belt can be deflected toward the receiving portion by its own weight.

(I) The angle between the upstream side of the front end of the deflected wet paper in the receiving portion in the traveling direction and the downstream side in the receiving portion of the heating carrier or the holding belt in the wet paper transport direction is 90 degrees or more. It is set to be.

(J) The heating carrier is provided so that the heating surface comes into contact with the contact surface of the wet paper with the papermaking belt.

(K) The wet paper transport speed of the holding belt is set to be faster than the wet paper transport speed of the papermaking belt.

(L) The wet paper transport speed of the heating carrier is set to be faster than the wet paper transport speed of the papermaking belt.

(M) The wet paper detecting means for detecting that the wet paper peeled off from the papermaking belt has been delivered to the receiving portion is provided.

The papermaking apparatus of the present invention has a peeling portion for peeling the front end of the wet paper from the papermaking belt in the paper making portion, and the drying portion includes a heating transport body that transports the wet paper while heating it on a heating surface, and the heating transport. It has a holding belt that holds and conveys the wet paper between the body and the body, and the wet paper peeled from the papermaking belt at the peeling portion is heated in the holding belt or the heating carrier in the drying portion. A receiving portion is provided to receive the paper on the surface, and the papermaking belt is provided at a predetermined distance from the receiving portion. Ru can be passed to the drying section. Further, in the papermaking apparatus of the present invention, the drying unit is a heating unit that receives the wet paper peeled from the papermaking belt at the peeling unit and conveys the wet paper received at the receiving unit while heating on the heating surface. Since a carrier is provided and the papermaking belt is provided at a predetermined distance from the receiving portion, the durability of the papermaking belt is prevented from being lowered regardless of the material of the papermaking belt, and the wet paper is transferred from the papermaking portion to the drying portion. Can be handed over.

Further, according to the papermaking apparatus provided with the above configuration (a), since the wet paper is dehydrated in the middle of the papermaking outbound route, the wet paper can be easily peeled from the papermaking belt at the peeling portion.

Further, according to the papermaking apparatus provided with the above configuration (b), the wet paper can be easily peeled from the papermaking belt at the peeling portion.

Further, according to the papermaking apparatus provided with the above configuration (c), the wet paper can be more easily peeled from the papermaking belt at the curved traveling portion.

Further, according to the papermaking apparatus provided with the above configuration (d), the wet paper peeled from the papermaking belt and received by the drying unit can be efficiently dried and conveyed.

Further, according to the papermaking apparatus provided with the above configuration (e), the wet paper peeled from the papermaking belt can be easily delivered to the drying portion.

Further, according to the papermaking apparatus provided with the above configuration (f), the wet paper peeled from the papermaking belt can be easily delivered to the drying portion.

Further, according to the papermaking apparatus provided with the above configuration (g), the wet paper peeled from the papermaking belt can be efficiently delivered to the drying portion.

Further, according to the papermaking apparatus provided with the above configuration (h), the wet paper peeled from the papermaking belt can be easily delivered to the drying portion.

Further, according to the papermaking apparatus provided with the above configuration (i), the wet paper peeled from the papermaking belt can be efficiently received and conveyed by the drying unit.

Further, according to the papermaking apparatus provided with the above configuration (j), it is possible to suppress the formation of the mesh pattern of the papermaking belt on the paper.

Further, according to the papermaking apparatus provided with the above configuration (k), it is possible to prevent the wet paper from loosening between the paper making portion and the drying portion, and to prevent the paper from forming wrinkles and creases.

Further, according to the papermaking apparatus provided with the above configuration (l), it is possible to prevent the wet paper from loosening between the paper making portion and the drying portion, and to prevent the paper from forming wrinkles or folds.

Further, according to the papermaking apparatus provided with the above configuration (m), it is possible to detect the success or failure of delivery of the wet paper from the papermaking section to the drying section.

It is a structural schematic diagram of the papermaking apparatus of this invention. It is a front view of the papermaking part and the drying part which concerns on 1st Embodiment. It is a partially enlarged view of the papermaking part and the drying part of FIG. It is a partially enlarged plan view of the papermaking part and the drying part which concerns on 1st Embodiment. It is a control flow chart of the delivery detection of the wet paper in the papermaking operation which concerns on 1st Embodiment. It is a front view of the papermaking part and the drying part which concerns on 2nd Embodiment. It is a partially enlarged view of the papermaking part and the drying part of FIG. It is a partially enlarged plan view of the papermaking part and the drying part which concerns on 2nd Embodiment. It is a front view of the papermaking part and the drying part which concerns on 3rd Embodiment. It is a front view of the papermaking part and the drying part which concerns on 4th Embodiment.

<First Embodiment>
The overall configuration of the papermaking apparatus will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of a papermaking apparatus.

The papermaking apparatus 1 includes a pulp liquid manufacturing section 2, a deinking section 3, a papermaking section 4, a drying section 5, and a finishing section 6 inside the papermaking machine main body 10.

The pulp liquid manufacturing unit 2 dissociates the pulp raw material to produce a pulp suspension (not shown) containing pulp. In the present embodiment, a pulp suspension is produced using used paper 11 as a pulp raw material.

The deinking unit 3 deinks the pulp suspension produced in the pulp liquid manufacturing unit 2.

The papermaking section 4 makes a papermaking of the deinked pulp suspension supplied from the deinking section 3 to generate a wet paper W (see FIG. 2).

The drying unit 5 dries the wet paper W produced by the papermaking unit 4.

The finishing portion 6 is obtained by drying the wet paper W by the drying portion 5 and performing a finishing treatment such as cutting to obtain the paper 12.

Further, inside the paper machine main body 10, a control unit 7 for controlling the operation of the paper making device 1 is provided.

Further, the paper machine main body 10 is formed in a size that can be installed in, for example, an office. That is, the papermaking device 1 is configured as a small papermaking device.

The details of the papermaking section 4 and the drying section 5 will be described with reference to FIGS. 2 to 4. FIG. 2 is a front view of the papermaking section 4 and the drying section 5 according to the present embodiment, and FIG. 3 is a partially enlarged view of the papermaking section 4 and the drying section 5 of FIG. FIG. 4 is a partially enlarged plan view of the papermaking section 4 and the drying section 5 according to the present embodiment.

(Paper machine)
The papermaking unit 4 includes a plurality of support rollers 40, a papermaking belt 41, and a head box 42. The support roller 40 is rotatably supported by a frame (not shown). The papermaking belt 41 is a mesh-like belt having water permeability. Further, the papermaking belt 41 is hung on a plurality of support rollers 40 and is formed in an endless shape. The deinked pulp suspension is fed from the deinking section 3 to the head box 42. The head box 42 uniformly causes the pulp suspension fed from the deinking unit 3 to flow out onto the papermaking belt 41. Therefore, the papermaking belt 41 filters the pulp suspension flowing out of the head box 42 to produce wet paper W.

Further, the papermaking belt 41 has a papermaking outbound route 410 and a papermaking inbound route 411. The papermaking outbound route 410 is a traveling path of the papermaking belt 41 that carries and conveys the wet paper W. The papermaking return path 411 is a traveling path of the papermaking belt 41 that circulates at the start end of the papermaking outbound path 410 after finishing contact with the wet paper W.

A plurality of draining plates 43 are arranged at predetermined intervals below the papermaking belt 41 in the papermaking outbound route 410. Each draining plate 43 drains the pulp suspension that has flowed out onto the papermaking belt 41. Each draining plate 43 extends in the width direction orthogonal to the traveling direction of the papermaking belt 41, and is provided so as to be in sliding contact with the lower surface of the papermaking belt 41 on the papermaking outbound route 410.

A dehydration section 44 for dehydrating the wet paper W is provided in the middle of the papermaking outbound route 410. The dehydrating section 44 has a pressing roller 440 and an opposing roller 441. The pressing roller 440 and the opposing roller 441 are arranged so as to face each other with the papermaking belt 41 interposed therebetween. Further, the pressing roller 440 and the opposing roller 441 have a water absorbing layer having water absorption on their surfaces.

The pressing roller 440 is urged toward the opposing roller 441 by a spring (not shown) at a predetermined pressure. A papermaking driving means (not shown) is connected to the opposing roller 441. The papermaking driving means drives and rotates the opposed roller 441 to cause the papermaking belt 41 to travel in the traveling direction indicated by the arrow X1. Further, each of the support roller 40 and the pressing roller 440 is driven to rotate as the papermaking belt 41 travels.

In the present embodiment, the papermaking driving means is connected to the opposing roller 441 to drive the papermaking belt 41, but the papermaking driving means is used as the support roller 40 of any one of the support rollers 40. May be connected to. For example, when the papermaking driving means is connected to the support roller 40a, the papermaking belt 41 is driven by driving and rotating the support roller 40a.

A support roller 40a of the support rollers 40 is arranged at the end of the papermaking outbound route 410. The support roller 40a is provided at a position higher than that of the pressing roller 440. Therefore, as shown in FIG. 2, when the downstream side of the wet paper transport direction indicated by the arrow X is viewed from the head box 42, the papermaking outward path 410 from the dehydration section 44 to the support roller 40a is the dehydration section. It is inclined upward with respect to the papermaking outbound route 410 until it reaches 44.

Further, a peeling portion 45 is provided at the end portion of the papermaking outbound route 410. The papermaking belt 41 has a curved traveling portion 410a at the end of the papermaking outbound route 410. The papermaking belt 41 is curved and travels along the support roller 40a in the curved traveling portion 410a.

The papermaking belt 41 is formed so as to have a predetermined radius of curvature R in the curved traveling portion 410a. In the present embodiment, the radius of curvature R is defined by the radius of the support roller 40a. Further, the radius of curvature R is set to a value at which the front end of the wet paper W can be peeled off from the papermaking belt 41 which runs in a curved manner by the waist of the wet paper W. Therefore, the front end of the wet paper W is peeled off from the papermaking belt 41 by the waist of the wet paper W at the curved traveling portion 410a. That is, the peeling portion 45 is provided on the curved traveling portion 410a of the papermaking belt 41.

The radius of curvature R of the curved traveling portion 410a is preferably set to 50 mm or less so that the front end of the wet paper W can be peeled off, and is set to 25 mm in the present embodiment. Further, as a modification of the peeling portion 45, a thin plate-shaped peeling member that comes into contact with the papermaking belt 41 may be provided to peel off the front end of the wet paper W. The thin plate-shaped peeling member is provided so that the tip end portion is in sliding contact with the papermaking belt 41, and comes into contact with the front end of the wet paper W to peel off the front end of the wet paper W. Further, as another modification of the peeling portion 45, the peeling portion 45 may be formed by the curved traveling portion 410a and the peeling member.

A white water tank 46 is provided below the papermaking belt 41. The white water tank 46 stores water (white water) generated by filtering the pulp suspension with the papermaking belt 41. The white water stored in the white water tank 46 is supplied to the pulp liquid manufacturing unit 2 and the deinking unit 3, and is appropriately used as treatment water in each unit.

(Dry part)
The drying unit 5 includes a heating carrier 50, a plurality of erection support rollers 51, and a holding belt 52. The heating carrier 50 and each erection support roller 51 are rotatably supported by a frame (not shown).

The heating carrier 50 has a heating means (not shown) inside and has a cylindrical shape. The heat carrier 50 is made of a heat-resistant material such as metal. The heating carrier 50 has a heating surface 501 that is heated to an appropriate temperature by a heating means. That is, the heating carrier 50 transports the wet paper W while heating it on the heating surface 501 to dry the wet paper W. In the present embodiment, the heating surface 501 is heated so as to be in the range of 90 ° C. to 110 ° C.

The holding belt 52 is hung on each erection support roller 51 and is formed in an endless shape. The holding belt 52 has a dry outbound route 520 and a dry inbound route 521. The dry outbound route 520 is a travel path of the holding belt 52 that conveys the wet paper W by traveling in contact with the wet paper W. The dry return route 521 is a travel path of the holding belt 52 that circulates at the start end of the dry outward route 520 after finishing contact with the wet paper W.

Of the erection support rollers 51, the erection support roller 51a is arranged at the start end of the dry outbound route 520. Further, an erection support roller 51b among the erection support rollers 51 is arranged at the end of the dry outbound route 520. A driving means (not shown) is connected to the erection support roller 51b. The driving means drives and rotates the erection support roller 51b to cause the holding belt 52 to travel in the traveling direction indicated by the arrow X2. Further, the heating carrier 50 is driven to rotate in the rotation direction indicated by the arrow X3 as the holding belt 52 travels. Therefore, the heating carrier 50 rotates at the same peripheral speed as the wet paper transport speed (running speed) of the holding belt 52.

In the present embodiment, the driving means is connected to the erection support roller 51b to drive the holding belt 52, but the driving means may be connected to the heating carrier 50. In this case, the holding belt 52 is driven by driving and rotating the heating carrier 50. Therefore, in this case, the holding belt 52 travels at the same peripheral speed as the wet paper transport speed (rotation speed) of the heating transport body 50.

Further, the wet paper transport speed (running speed) of the holding belt 52 is set to be faster than the wet paper transport speed (running speed) of the papermaking belt 41. When the drive means is connected to the heat transfer body 50 as described above, the wet paper transfer speed (rotation speed) of the heat transfer body 50 is faster than the wet paper transfer speed (running speed) of the papermaking belt 41. Is set to be. Specifically, the wet paper transport speed (running speed) of the holding belt 52 or the wet paper transport speed (rotational speed) of the heating carrier 50 is higher than the wet paper transport speed (running speed) of the papermaking belt 41. It is set 1% to 3% faster. Therefore, the wet paper W peeled off from the papermaking belt 41 is conveyed in a state of being slightly pulled by the drying portion 5, and it is possible to prevent the wet paper W from loosening between the papermaking portion 4 and the drying portion 5.

The holding belt 52 is provided with a receiving portion 53 at the starting end of the drying outbound route 520. Then, the holding belt 52 receives the wet paper W peeled off by the peeling portion 45 of the papermaking portion 4 at the receiving portion 53.

A delivery section S is provided between the papermaking section 4 and the drying section 5. The delivery portion S is a space at the front end of the wet paper W to enable deflection toward the receiving portion 53 due to its own weight.

As shown by the solid line in FIG. 3, the front end of the wet paper W is peeled from the papermaking belt 41 by the waist of the wet paper W at the peeling point 450 near the start end of the curved transport portion 410a in the papermaking outbound route 410. The peeling portion 45 is composed of a papermaking belt 41 that runs curvedly at the peeling point 450.

Then, the front end of the wet paper W peeled off from the papermaking belt 41 is deflected toward the receiving portion 53 by its own weight in the delivering portion S. Specifically, the front end of the wet paper W is deflected from the state shown by the solid line in FIG. 3 to the state of W1 shown by the alternate long and short dash line and then to the state of W2 indicated by the alternate long and short dash line at the delivery portion S. .. The front end of the wet paper W in the state of W2 indicated by the alternate long and short dash line ends the contact with the papermaking belt 41 at the final contact position E. Further, the front end of the wet paper W in the state of W2 indicated by the alternate long and short dash line is received by the holding belt 52 at the receiving point 530. At this time, the receiving unit 53 is composed of a holding belt 52 traveling at the receiving point 530.

The front end of the wet paper W deflected to the state of W2 indicated by the alternate long and short dash line, the upstream side in the traveling direction of the wet paper W at the receiving portion 53 (reception point 530), and the receiving portion 53 (reception point 530) of the holding belt 52. A predetermined angle A is formed by the downstream side in the wet paper transport direction. The receiving portion 53 is provided so that the angle A is set to 90 degrees or more.

In the present embodiment, the receiving portion 53 is formed on the traveling path of the holding belt 52 curved along the peripheral surface of the erection support roller 51a. Therefore, as shown in FIG. 3, the upstream side of the wet paper W in the receiving portion 53 at the front end of the wet paper W in the traveling direction is from the receiving portion 53 to the upstream side in the wet paper transporting direction (left side of the receiving point 530 in FIG. 3). It is indicated by the back surface of the wet paper W on which it is located. Further, the downstream side of the holding belt 52 in the receiving portion 53 in the wet paper transport direction is indicated by a tangent line on the surface of the holding belt 52 having the receiving point 530 as a contact point, which is drawn to the right side of the receiving point 530 in FIG. The angle A is set to approximately 180 degrees as shown in FIG.

As shown in FIG. 3, a gap D is provided between the papermaking belt 41 and the holding belt 52 at the closest portion. The distance of the gap D is set to be equal to or less than the thickness of the front end of the wet paper W. It is more preferable that the distance of the gap D is set to be less than the thickness of the front end of the wet paper W. Further, the papermaking belt 41 and the holding belt 52 run without contacting each other because the gap D is provided. The traveling direction of the papermaking belt 41 and the traveling direction of the holding belt 52 are opposite in the place where the gap D is formed.

When the front end of the wet paper W is conveyed toward the gap D, the front end of the wet paper W is forcibly peeled from the papermaking belt 41 at the peeling point 451. The peeling portion 45 is composed of a papermaking belt 41 running at the peeling point 451. Further, the front end of the wet paper W is received by the holding belt 52 at the receiving point 531. At this time, the receiving unit 53 is composed of a holding belt 52 running at the receiving point 531. That is, a gap D is provided between the peeling portion 45 and the receiving portion 53.

Further, as shown in FIG. 3, the wet paper detecting means 54 is provided on the downstream side in the wet paper transport direction from the peeling portion 45 and on the upstream side in the wet paper transport direction from the receiving portion 53. The wet paper detecting means 54 is provided between the peeling portion 45 and the receiving portion 53, and is for detecting that the wet paper W peeled from the papermaking belt 41 is delivered to the receiving portion 53. The wet paper detecting means 54 has a light emitting sensor 540 and a light receiving sensor 541.

As shown in FIG. 3, the light emitting sensor 540 is provided above the wet paper W in the state of W2 indicated by the alternate long and short dash line, and as shown in FIG. 4, has a width orthogonal to the wet paper transport direction. It is provided on one end side in the direction. As shown in FIG. 3, the light receiving sensor 541 is provided below the wet paper W in the state of W2 indicated by the alternate long and short dash line, and as shown in FIG. 4, the width direction orthogonal to the wet paper transport direction. It is provided on the other end side of the. Therefore, the optical axis 542 of the light beam that the light emitting sensor 540 irradiates toward the light receiving sensor 514 intersects the transport surface of the wet paper W.

Further, as shown in FIG. 2, a holding belt 52 is wound around the heat carrier 50 over half a circumference or more of the heat carrier 50. The range in which the holding belt 52 is wound around the heating transport body 50 and travels forms the holding transport portion 55.

The sandwiching and transporting unit 55 sandwiches and conveys the wet paper W received by the receiving unit 53 between the heating carrier 50 and the sandwiching belt 52. The wet paper W comes into contact with the heating surface 501 at the sandwiching and transporting unit 55, is heated by the heating and transporting body 50, and is dried. The wet paper W is dried to become dry paper (not shown).

A scraping member 56 is provided on the downstream side of the sandwiching and transporting portion 55. The scraping member 56 peels off the front end of the wet paper W (dry paper) dried by the sandwiching and transporting unit 55 from the heating surface 501 of the heating and transporting body 50.

The operation of the papermaking device of the present embodiment will be described.

First, the used paper 11 is put into the pulp manufacturing unit 2. In addition to the used paper 11, tap water supplied from the tap water supply unit (not shown) or white water stored in the white water tank 46 is supplied to the pulp manufacturing unit 2 as disintegration water.

The pulp manufacturing unit 2 manufactures a pulp suspension by stirring the used paper 11 and the disintegrating water to disintegrate the used paper 11. When the production of the pulp suspension is completed, the transfer of the pulp suspension to the deinking portion 3 is started. Further, in the route of transferring the pulp suspension to the deinking unit 3, tap water supplied from the tap water supply unit (not shown) or white water stored in the white water tank 46 is added to the pulp suspension. , Supply as diluted water.

In the deinking unit 3, the deinking process is started. When the pulp suspension is supplied to the deinking unit 3, an air diffuser (not shown) is activated to generate air bubbles in the pulp suspension. Printing components such as toner and ink contained in the pulp suspension adhere to the bubbles generated in the pulp suspension and float in the pulp suspension together with the bubbles. That is, the bubbles separate the printing component contained in the pulp suspension from the pulp. A scraping means (not shown) removes the printed components that have floated in the pulp suspension together with air bubbles.

The deinked pulp suspension is supplied to the headbox 42. The pulp suspension supplied to the head box 42 is uniformly discharged onto the running papermaking belt 41. On the papermaking belt 41, the pulp suspension is filtered to produce wet paper W.

Filtration and dehydration of the wet paper W are promoted by the action of the plurality of draining plates 43 and the dehydration section 44 provided in the middle of the papermaking outbound route. The wet paper W is squeezed between the pressing roller 440 and the opposing roller 441 in the dehydrating section 44, and is dehydrated so as to have a predetermined water content. In the present embodiment, the wet paper W is dehydrated in the dehydration section 44 until the water content reaches about 60%.

The wet paper W that has passed through the dehydration section 44 is conveyed toward the curved traveling section 410a of the papermaking belt 41. In the curved traveling portion 410a, the papermaking belt 41 travels in a curved state having a radius of curvature R. Therefore, the front end of the wet paper W conveyed to the curved traveling portion 410a is easily peeled from the papermaking belt 41 at the peeling point 450 by the waist of the wet paper W.

By the way, in the present embodiment, the thickness of the front end of the wet paper W is formed to be the same as that of the wet paper W of the portion other than the front end (hereinafter, referred to as "normal wet paper W"). , The thickness of the front end of the wet paper W can be formed to be thicker than the thickness of the normal wet paper W. In that case, the front end of the wet paper W is made thicker than the normal wet paper W over a predetermined length in the wet paper transport direction.

For example, the control unit 7 controls the traveling speed of the papermaking belt 41 to be slower than the traveling speed when the normal wet paper W is made to make the thickness of the front end of the wet paper W thick. Further, it is also possible to provide a weir member (not shown) that can be brought into contact with the papermaking belt 41 so that the front end edges of the wet paper W are aligned in a straight line.

The weir member is formed of a plate-shaped member extending in the width direction of the wet paper W and having a linear tip that can come into contact with the papermaking belt 41 without a gap. When forming the front end of the wet paper W, the tip of the weir member is brought into contact with the papermaking belt 41 to prevent the pulp suspension from diffusing downstream on the papermaking belt 41 in the wet paper transport direction. As a result, the front end of the wet paper W can be formed thick and the front end edges can be aligned in a straight line.

The thickness of the front end of the wet paper W is set to be 2 to 15 times thicker than the thickness of the normal wet paper W. Since the front end of the wet paper W is formed thick, it has a stronger waist than the normal wet paper W. Therefore, the front end of the wet paper W conveyed to the curved traveling portion 410a is more easily peeled from the papermaking belt 41 at the peeling point 450 by the strong waist. Further, by forming the front ends of the wet paper W in a straight line, the front ends of the wet paper W are uniformly peeled off from the papermaking belt 41 in the width direction.

When the front end of the wet paper W peeled off from the papermaking belt 41 is conveyed for a while after that, the state of the wet paper W shown by the solid line in FIG. It is deflected by its own weight so as to be in the state of W2 indicated by the chain line. Then, the front end of the wet paper W deflected in the delivery portion S is received by the receiving portion 53 (reception point 530) of the holding belt 52.

Further, for example, when the wet paper W is sufficiently dehydrated, the front end of the wet paper W may not peel off from the papermaking belt 41. At this time, the front end of the wet paper W is conveyed toward the gap D. Since the distance of the gap D is set to be equal to or less than the thickness of the front end of the wet paper W, it does not pass through the front end of the wet paper W. The front end of the wet paper W is peeled from the papermaking belt 41 at the peeling point 451 (peeling portion 45), and is received by the holding belt 52 at the receiving point 531 (receiving portion 53).

When the wet paper W is in the state of W2 in FIG. 3, the light beam emitted by the light emitting sensor 540 is blocked by the wet paper W and does not enter the light receiving sensor 541, and the wet paper detecting means 54 is in a light-shielded state. Detect that there is. Then, when the control unit 7 detects the light-shielding state in the wet paper detecting means 54, the control unit 7 determines that the wet paper W has been delivered to the receiving unit 53. That is, the wet paper detecting means 54 detects that the wet paper W has been delivered to the receiving unit 53 by detecting the light-shielding state.

By the way, when the wet paper W is in a state other than W2 in FIG. 3 (a state shown by a solid line, a state of W1 shown by an alternate long and short dash line, a state of being conveyed toward the gap D, etc.), the light emitting sensor 540 The light beam to be irradiated is incident on the light receiving sensor 541, and the wet paper detecting means 54 detects that the light is transmitted. Then, when the wet paper detecting means 54 continuously detects the light transmission state for a predetermined time, the control unit 7 determines that the wet paper W has not been delivered to the receiving unit 53. That is, the wet paper detecting means 54 detects that the wet paper W has not been delivered to the receiving unit 53 and that a delivery error has occurred by continuously detecting the light transmission state for a predetermined time.

Here, the control related to the delivery detection of the wet paper W will be described with reference to FIG. FIG. 5 is a control flow diagram of the delivery detection of the wet paper W in the papermaking operation.

When the papermaking operation is started and the pulp suspension is supplied onto the papermaking belt 41 in the stopped state, the front end of the wet paper W is formed (step S1). When the pulp suspension is supplied for a predetermined time and the front end of the wet paper W is formed, the papermaking belt 41 is driven to run and the wet paper W is started to be conveyed. When the transfer of the wet paper W is started, the counter of the control unit 7 is operated to start counting the elapsed time from the start of the drive running of the papermaking belt 41 (step S2). The front end of the wet paper W is conveyed on the papermaking outward path 410 until it is peeled off by the peeling portion 45. Then, the front end of the wet paper W peeled off from the papermaking belt 41 is handed over to the drying portion 5.

Subsequently, it is determined whether or not the count value by the counter of the control unit 7 has reached the predetermined value t1 (step S3). The predetermined value t1 is a predetermined transport distance from the position of the front end edge of the wet paper W at the time when the drive running of the papermaking belt 41 is started to the pinching start portion P2, and the wet paper transport speed (the papermaking belt 41). It corresponds to the first required time when the paper is conveyed at the traveling speed and the traveling speed of the holding belt 52). The pinching start portion P2 is the most upstream position of the pinching transport portion 55 in the wet paper transport direction. That is, in step S3, it is determined that the front end edge of the wet paper W is predicted to reach the pinching start portion P2.

If the count value does not reach the predetermined value t1 in step S3, it is predicted that the front edge of the wet paper W has not reached the pinching start portion P2, and step S3 until the count value reaches the predetermined value t1. Repeat the judgment of. Further, in step S3, when the count value reaches the predetermined value t1, it is predicted that the front end of the wet paper W has reached the pinching start portion P2, and the wet paper W is detected by the wet paper detecting means 54. Is started (step S4).

Then, it is determined whether or not the count value by the counter of the control unit 7 from the time when the supply of the pulp suspension onto the papermaking belt 41 is stopped has reached the predetermined value t2 (step S5). The predetermined value t2 is a predetermined transport distance from the position of the trailing edge of the wet paper W at the time when the supply of the pulp suspension is stopped to the predetermined position P1, and the wet paper transport speed (papermaking belt 41). It corresponds to the second required time when the paper is conveyed at the traveling speed and the traveling speed of the holding belt 52). The trailing edge of the wet paper W is formed by stopping the supply of the pulp suspension onto the papermaking belt 41. The predetermined position P1 is a position on the downstream side in the wet paper transport direction from the receiving portion 53 and on the upstream side in the wet paper transport direction from the pinching start portion P2. That is, in step S5, it is determined that the trailing edge of the wet paper W is predicted to reach the predetermined position P1.

In step S5, when the count value from the time when the supply of the pulp suspension is stopped reaches the predetermined value t2, the papermaking operation is completed and the trailing edge of the wet paper W has reached the predetermined position P1. Is predicted, and the process is terminated (step S6). The conditions for ending the papermaking operation include, for example, when the user inputs an instruction to stop papermaking, the pulp suspension that can be supplied to the papermaking unit 4 is exhausted, and papermaking cannot be continued, or the number of papers produced. For example, when the required number of sheets is reached. Further, in step S5, when the supply of the pulp suspension is continued, or when the count value from the time when the supply of the pulp suspension is stopped does not reach the predetermined value t2, the wet paper W It is predicted that the trailing edge has not reached the predetermined position P1, and the count value by the control unit 7 counter from the time when the light-transmitting state is detected by the wet paper detecting means 54 is the light-transmitting state of the wet paper detecting means 54. In the continuous state, it is determined whether or not the predetermined value t3 has been reached (step S7).

The predetermined value t3 corresponds to the third required time when the first predetermined distance L1 is conveyed at the wet paper conveying speed (the traveling speed of the papermaking belt 41, the traveling speed of the holding belt 52). That is, in step S7, it is determined whether the wet paper detecting means 54 has conveyed the wet paper W for the first predetermined distance L1 while the light-transmitting state is continued.

In step S7, when the wet paper W is delivered to the receiving unit 53 and exists between the light emitting sensor 540 and the light receiving sensor 541, that is, when the wet paper detecting means 54 detects a light blocking state instead of a light transmitting state. , Return to the determination in step S5. Further, even if the wet paper W does not exist between the light emitting sensor 540 and the light receiving sensor 541, but the count value from the time when the light transmitting state is detected by the existing wet paper detecting means 54 does not reach the predetermined value t3. Return to the determination in step S5.

In step S7, the count value from the time when the wet paper detecting means 54 detects the light-transmitting state has reached the predetermined value t3 while the light-transmitting state is continued without being detected by the wet paper detecting means 54. In this case, assuming that the wet paper W has been transported by the first predetermined distance L1 while the light-transmitting state of the wet paper detecting means 54 continues, the wet paper transport speed in the drying unit 5 is increased (step). S8).

In the present embodiment, in step S8, the traveling speed of the holding belt 52 is increased by 5% so as to be 105% of the traveling speed during normal transportation. When the wet paper W is conveyed at the normal transfer speed, the traveling speed of the holding belt 52 is set to be 1 to 3% faster than the traveling speed of the papermaking belt 41, and the papermaking section 4 and the drying are set. It suppresses the wet paper W from loosening with the part 5. However, depending on the state of the papermaking, the wet paper W may loosen between the papermaking section 4 and the drying section 5. When the wet paper W loosens between the paper making section 4 and the drying section 5, the wet paper detecting means 54 becomes a light-transmitting state and cannot detect the wet paper W. Therefore, in step S8, in order to eliminate the slack of the wet paper W between the papermaking section 4 and the drying section 5, the wet paper transport speed of the drying section 5 is increased.

Then, similarly to step S5, it is determined whether the count value by the counter of the control unit 7 from the time when the supply of the pulp suspension onto the papermaking belt 41 is stopped has reached the predetermined value t2 (step S9). In step S9, when the count value from the time when the supply of the pulp suspension is stopped reaches the predetermined value t2, the papermaking operation is completed and the trailing edge of the wet paper W has reached the predetermined position P1. Is predicted, and the process is terminated (step S10). Further, in step S9, when the supply of the pulp suspension is continued, or when the count value from the time when the supply of the pulp suspension is stopped does not reach the predetermined value t2, the wet paper W It is predicted that the trailing edge has not reached the predetermined position P1, and it is determined whether the wet paper detecting means 54 has detected the light transmission state (step S11).

In step S11, when the wet paper W is delivered to the receiving unit 53 and exists between the light emitting sensor 540 and the light receiving sensor 541, that is, the wet paper detecting means 54 detects the light blocking state instead of the light transmitting state. In that case, the wet paper transport speed of the drying unit 5 is returned to the normal speed (step S12), and the determination in step S5 is returned. By the way, even though the wet paper W is delivered to the receiving section 53, if the wet paper transport speed of the drying section 5 is continuously increased, the wet paper between the papermaking section 4 and the drying section 5 is continuously conveyed. The wet paper W breaks due to the difference in transport speed. Therefore, in order to prevent the wet paper W from breaking, when the wet paper detecting means 54 detects the light-shielding state in step S11, the wet paper conveying speed of the drying portion 5 is returned to the normal speed in step S12. ..

Further, in step S11, when the wet paper W does not exist between the light emitting sensor 540 and the light receiving sensor 541, that is, when the wet paper detecting means 54 detects the light transmission state, the wet paper detecting means 54 It is determined whether or not the count value by the control unit 7 counter from the time when the light passing state is detected reaches a predetermined value t4 while the light passing state of the wet paper detecting means 54 continues (step S13).

The predetermined value t4 corresponds to the fourth required time when the second predetermined distance L2 is conveyed at the wet paper conveying speed (the traveling speed of the papermaking belt 41, the traveling speed of the holding belt 52). Further, the second predetermined distance L2 is the front edge of the wet paper W at the time when the wet paper detection means 54 starts detecting the wet paper W when the paper is conveyed to the papermaking return path 411 without peeling from the papermaking belt 41. Starting from the predicted arrival position, the front edge of the wet paper W is set to the distance from the position where the wet paper W is conveyed by the first predetermined distance L1 to the position where the cleaning liquid to be supplied, which will be described later, is reached. That is, in step S13, it is determined whether or not the wet paper W has been conveyed by the wet paper detecting means 54 at the second predetermined distance L2 while the light-transmitting state is continued.

In step S13, when the wet paper W is delivered to the receiving unit 53 and exists between the light emitting sensor 540 and the light receiving sensor 541, that is, when the wet paper detecting means 54 detects a light blocking state instead of a light transmitting state. , Return to the determination in step S9. Further, even if the wet paper W does not exist between the light emitting sensor 540 and the light receiving sensor 541, but the count value from the time when the light transmitting state is detected by the wet paper detecting means 54 does not reach the predetermined value t4, the step is also performed. Return to the judgment of S9.

In step S13, the count value from the time when the wet paper detecting means 54 detects the light-transmitting state has reached the predetermined value t4 while the light-transmitting state is continued without being detected by the wet paper detecting means 54. In this case, it is determined that a delivery error of the wet paper W has occurred from the papermaking section 4 to the drying section 5, a delivery error signal is output, and the supply of the pulp suspension on the papermaking belt 41 is stopped (step). S14). Then, the papermaking operation is completed (step S15).

In the papermaking operation after the wet paper W is handed over from the papermaking section 4 to the drying section 5, the processes of steps S5 to S13 are repeated. By the way, the wet paper W once delivered to the drying section 5 is broken between the paper making section 4 and the drying section 5, and the front end of the subsequent wet paper W generated by the break is delivered to the drying section 5. If this is not possible, it is possible to detect that a mistake in delivery of the wet paper W has occurred by proceeding to the process of step S14 through the repeated processes of steps S5 to S13.

The control unit 7 starts the cleaning operation of the papermaking belt 41 based on the signal of the delivery error in step S14. Further, a message indicating that a delivery error of the wet paper W has occurred or that the papermaking belt 41 is being washed is displayed on the operation panel (not shown) connected to the control unit 7. In the cleaning operation of the papermaking belt 41, the cleaning liquid is supplied from the cleaning liquid supply means (not shown) provided inside the circulation running path of the papermaking belt 41 to a predetermined area of the papermaking belt 41 traveling on the papermaking return path 411. By supplying the cleaning liquid to the papermaking return path 411, the wet paper W remaining on the surface of the papermaking belt 41 due to a delivery error is removed. The wet paper W removed by the cleaning operation is collected together with the cleaning liquid supplied to the white water tank 46 provided below the papermaking belt 41. After the papermaking belt 41 is washed, the process returns to step S1 and the papermaking operation is restarted.

When the wet paper W is delivered from the papermaking section 4 to the drying section 5, the holding belt 52 conveys the wet paper W received by the receiving section 53 toward the sandwiching and conveying section 55. The wet paper W is pressed against the heating surface 501 by the sandwiching belt 52 and conveyed in the sandwiching and conveying section 55. Therefore, the heat-conveying body 50 can efficiently dry the wet paper W by heating the wet paper W in a state where it is in contact with the wet paper W without a gap in the sandwiching and transporting unit 55. The wet paper W is dried to become dry paper.

The front edge of the dry paper that has passed through the sandwiching and conveying portion 55 is peeled off from the heating surface 501 of the heating and conveying body 50 by the scraping member 56. The dry paper sent out from the drying section 5 is conveyed to the finishing section 6. The finishing unit 6 performs a finishing process such as cutting to a predetermined size on the conveyed dry paper. The paper produced by finishing the dry paper is discharged from the paper ejection port of the papermaking apparatus 1 to the outside of the papermaking machine main body 10.

[effect]
According to the papermaking apparatus of the present embodiment, the following effects can be exhibited.

(1) Since the papermaking belt 41 is provided at a predetermined distance from the receiving portion 53 , the papermaking belt 41 can suppress the influence of heat received from the heating carrier 50. Therefore, it is possible to prevent the durability of the papermaking belt 41 from being lowered regardless of the material of the papermaking belt 41.

(2) Since the dehydration section 44 is provided in the middle of the papermaking outbound route 410, the wet paper W can be dehydrated and the wet paper W can be strengthened. Therefore, the front end of the wet paper W can be easily peeled from the papermaking belt 41 at the peeling portion 45 and handed over to the drying portion 5.

(3) Since the papermaking belt 41 has a curved traveling portion 410a and the curved traveling portion 410a is provided with a peeling portion 45, the front end of the wet paper W can be easily peeled from the papermaking belt 41 and received by the drying portion 5. Can be passed. Further, in the curved traveling portion 410a, the papermaking belt 41 has a radius of curvature R set to a value that can be peeled off from the papermaking belt 41 in which the front end of the wet paper W is curved and travels by the waist of the wet paper W. , The front end of the wet paper W can be more easily peeled off from the papermaking belt 41 and handed over to the drying portion 5.

(4) Since the drying unit 5 is provided with a receiving unit 53 for receiving the wet paper W peeled off from the papermaking belt 41, the wet paper W can be efficiently delivered from the papermaking unit 4 to the drying unit 5.

(5) The drying unit 5 has a holding belt 52, and the wet paper W peeled off from the papermaking belt 41 is sandwiched and conveyed between the heating carrier 50 and the holding belt 52, so that the wet paper is conveyed. By sandwiching the front end of W, the subsequent wet paper W can be pulled in from the papermaking section 4. Further, in the sandwiching transport section 55, the wet paper W is pressed against the heating surface 501 by the sandwiching belt 52 and transported, so that the wet paper W can be dried efficiently.

(6) Since the holding belt 52 has a receiving portion 53, the wet paper W can be easily received while being conveyed. Therefore, the wet paper W peeled off from the papermaking belt 41 can be efficiently delivered to the drying portion 5.

(7) Between the papermaking section 4 and the drying section 5, a delivery section S is provided so that the front end of the wet paper W peeled off from the papermaking belt 41 can be deflected toward the receiving section 53 by its own weight. , The front end of the wet paper W can be stably delivered to the receiving unit 53. Therefore, the wet paper W peeled off from the papermaking belt 41 can be easily delivered to the drying portion 5.

(8) Since a gap D having a distance equal to or less than the thickness of the front end of the wet paper W in the peeling portion 45 is provided between the peeling portion 45 and the receiving portion 53, the front end of the wet paper W is a gap. Even when the paper is conveyed toward D, the front end of the wet paper W can be forcibly peeled off from the papermaking belt 41. Therefore, the wet paper W peeled off from the papermaking belt 41 can be efficiently delivered to the drying portion 5.

(9) The angle A formed by the upstream side of the receiving portion 53 of the front end of the wet paper W in the traveling direction of the wet paper W and the downstream side of the receiving portion 53 of the holding belt 52 in the wet paper transport direction is set to 90 degrees or more. Therefore, it is possible to prevent the front end of the wet paper W from being bent and causing poor transportation. Therefore, the wet paper W peeled off from the papermaking belt 41 can be efficiently received and conveyed by the drying unit 5.

(10) Since the wet paper transport speed (running speed) of the holding belt 52 is set to be faster than the wet paper transport speed (running speed) of the papermaking belt 41, the papermaking section 4 and the drying section 5 It is possible to prevent the wet paper W from loosening between the wet papers W and prevent the wet paper W from forming wrinkles or folds. Further, when the drive means is connected to the heat transport body 50, the wet paper transport speed (rotation speed) of the heat transport body 50 is made faster than the wet paper transport speed (running speed) of the papermaking belt 41. Since it is set to, it is possible to prevent the wet paper W from loosening between the paper making portion 4 and the drying portion 5, and to prevent the wet paper W from forming wrinkles or creases.

(11) Wet paper detecting means 54 provided on the downstream side in the wet paper transport direction from the peeling portion 45 and on the upstream side in the wet paper transport direction from the receiving portion 53, that is, between the peeling portion 45 and the receiving portion 53. Since the wet paper W is detected, it is possible to detect that the wet paper W has been handed over from the papermaking section 4 to the drying section 5. In addition, it is possible to detect that a mistake in delivery of the wet paper W from the papermaking section 4 to the drying section 5 has occurred. Therefore, it is possible to detect the success or failure of delivery of the wet paper from the papermaking section to the drying section.

<Second Embodiment>
Based on FIGS. 6 to 8, the papermaking apparatus according to the second embodiment will be described focusing on a configuration different from that of the first embodiment. The parts and parts having the same configuration as that of the first embodiment are designated by the same reference numerals.

6 is a front view of the papermaking section 4 and the drying section 5 according to the present embodiment, FIG. 7 is a partially enlarged view of the papermaking section 4 and the drying section 5 of FIG. 6, and FIG. 8 is a partially enlarged view of the present embodiment. It is a partially enlarged plan view of the papermaking part 4 and the drying part 5 which concerns on.

As shown in FIG. 6, in the present embodiment, the erection support roller 51a is provided at a position lower than the support roller 40a.

As shown in FIG. 7, the front end of the wet paper W peeled off from the papermaking belt 41 is shown by a two-dot chain line at the delivery portion S from the state shown by the solid line in FIG. 7 to the state of W1 shown by the alternate long and short dash line. It is deflected downward from the horizontal so as to be in the state of W2. As shown in FIG. 7, the final contact position E at which the papermaking belt 41 finishes contacting with the wet paper W is a position slightly shifted to the right along the curved transport surface 410a from the upper end position of the support roller 40a (papermaking belt 41). It is formed at a position slightly offset to the downstream side in the traveling direction of.

The receiving portion 53 composed of the holding belt 52 traveling at the receiving point 530 is provided at a position lower than the final contact position E between the papermaking belt 41 and the wet paper W. The front end of the wet paper W deflected to the state of W2 indicated by the alternate long and short dash line is received by the holding belt 52 at the receiving point 530.

The front end of the wet paper W deflected to the state of W2 indicated by the alternate long and short dash line, the upstream side in the traveling direction of the wet paper W at the receiving portion 53 (reception point 530), and the receiving portion 53 (reception point 530) of the holding belt 52. The angle A formed by the downstream side in the wet paper transport direction is set to be an obtuse angle of less than 180 degrees.

In the present embodiment, the receiving portion 53 is formed on the traveling path of the holding belt 52 that has finished contact with the erection support roller 51a and travels linearly toward the heating carrier 50. Therefore, as shown in FIG. 7, the upstream side in the traveling direction of the wet paper W in the receiving portion 53 at the front end of the wet paper W is the upstream side in the wet paper transporting direction from the receiving portion 53 (the upper left side of the receiving point 530 in FIG. 7). It is indicated by the back surface of the wet paper W located at. Further, the downstream side of the receiving portion 53 of the holding belt 52 in the wet paper transport direction is indicated by the surface of the holding belt 52 located on the lower right side from the receiving point 530 in FIG. 7.

Further, it is the same as the first embodiment in that the wet paper detecting means 54 is provided on the downstream side in the wet paper transport direction from the peeling portion 45 and on the upstream side in the wet paper transport direction from the receiving portion 53. .. However, in the present embodiment, the wet paper detecting means 54 is provided so that the optical axis 542 of the light beam emitted by the light emitting sensor 540 toward the light receiving sensor 514 in FIG. 7 is inclined. Different from.

That is, as shown in FIG. 7, the wet paper detecting means 54 is provided so as to detect the wet paper W inclined downward from the horizontal (in the state of W2 indicated by the alternate long and short dash line). As shown in FIG. 7, the light emitting sensor 540 is provided above the wet paper W in the state of W2 indicated by the alternate long and short dash line (on the surface side of the wet paper W), and as shown in FIG. 8, the wet paper is provided. It is provided on one end side in the width direction orthogonal to the transport direction. As shown in FIG. 7, the light receiving sensor 541 is provided below the wet paper W in the state of W2 indicated by the alternate long and short dash line (on the back surface side of the wet paper W), and as shown in FIG. 8, the wet paper transport is provided. It is provided on the other end side in the width direction orthogonal to the direction.

By the way, according to the papermaking apparatus of the first embodiment, the front end of the wet paper W deflected to the state of W2 shown by the alternate long and short dash line in FIG. 3 is tangentially directed to the receiving point 530 by its own waist. It maintains a horizontal state along it. Then, as the transport of the wet paper W progresses, the front end of the wet paper W comes into contact with the heating surface 501 of the heating transport body 50 while maintaining the horizontal state. As a result, the wet paper W is deflected toward the holding belt 52 by the heating carrier 50 against the waist at the front end of the wet paper W, and at that time, creases or wrinkles are formed in the wet paper W. I was afraid to do it.

However, according to the papermaking apparatus of the present embodiment, the erection support roller 51a is provided at a position lower than the support roller 40a, and the receiving portion 53 is located at a position lower than the final contact position E between the papermaking belt 41 and the wet paper W. Since it is provided, the front end of the wet paper W tends to be along the heating surface 501 of the heating carrier 50. Therefore, the force received when the front end of the wet paper W is deflected toward the holding belt 52 by the heating carrier 50 can be reduced, or as shown in FIG. 7, the wet paper W is not deflected by the heating carrier 50. Therefore, it is possible to prevent the wet paper W from forming creases or wrinkles. Further, since the receiving portion 53 is provided at a position lower than the final contact position E, the wet paper W that is about to hang down due to its own weight can be easily received by the receiving portion 53, and the wet paper W can be dried. It is possible to suppress a delivery error to the unit 5. Therefore, the wet paper W peeled off from the papermaking belt 41 can be easily delivered to the drying portion 5.

Further, the effect obtained by the same configuration as the papermaking apparatus according to the first embodiment is the same as that of the first embodiment in this embodiment.

<Third Embodiment>
Based on FIG. 9, the papermaking apparatus according to the third embodiment will be described focusing on a configuration different from each of the above embodiments. The parts and parts having the same configuration as those of the above embodiments are designated by the same reference numerals. FIG. 9 is a front view of the papermaking section 4 and the drying section 5 according to the present embodiment.

As shown in FIG. 9, in the present embodiment, the erection support roller 51a is provided at a position higher than the support roller 40a. Further, the erection support roller 51b is provided at a position lower than the support roller 40a.

The holding belt 52 is driven and traveled in the traveling direction indicated by the arrow X4 by a driving means (not shown). Further, the heating carrier 50 is driven to rotate in the rotation direction indicated by the arrow X5 as the holding belt 52 travels.

The front end of the wet paper W peeled off from the papermaking belt 41 is deflected at the delivery portion S from the state shown by the solid line in FIG. 9 to the state of W1 shown by the alternate long and short dash line. The front end of the wet paper W in the state of W1 indicated by the alternate long and short dash line is received by the heating carrier 50. The receiving portion 53 is composed of a heating surface 501 of a heating transport body 50 that is driven and rotated on the upstream side of the sandwiching transport portion 55 in the wet paper transport direction. That is, since the heating transport body 50 has the receiving portion 53, it can be easily received while transporting the wet paper W. Therefore, the wet paper W peeled off from the papermaking belt 41 can be efficiently delivered to the drying portion 5.

The heating surface 501 of the heating carrier 50 comes into contact with the contact surface of the wet paper W with the papermaking belt 41. That is, the heating carrier 50 is provided so that the contact surface of the wet paper W with the papermaking belt 41 and the contact surface of the wet paper W with the heating surface 501 are the same surface.

As shown in FIG. 9, the front end of the wet paper W deflected to the state of W1 indicated by the alternate long and short dash line, the upstream side in the traveling direction of the wet paper W in the receiving portion 53, and the wet paper transport in the receiving portion 53 of the heating carrier 50. The angle A formed by the downstream side in the direction is set to be an obtuse angle of less than 180 degrees.

The upstream side of the wet paper W in the receiving portion 53 at the front end of the wet paper W in the traveling direction is indicated by the back surface of the wet paper W located on the upstream side in the wet paper transport direction (lower left side of the receiving portion in FIG. 9) from the receiving portion 53. Is done. Further, the downstream side of the receiving portion 53 of the heating transport body 50 in the wet paper transport direction is indicated by a tangent line on the heating surface 501 with the receiving portion 53 as a contact, which is drawn to the upper right side of the receiving portion 53 in FIG.

As shown in FIG. 9, the wet paper detecting means 54 is provided so as to detect the wet paper W inclined upward from the horizontal (in the state of W1 indicated by the alternate long and short dash line).

Further, the erection support roller 51b is provided below the heating carrier 50 and at a position separated from the heating surface 501. The sandwiching roller 57 is provided at a position horizontally opposed to the heating support roller 51b via the sandwiching belt 52. The front edge of the wet paper W (dry paper) that has been conveyed and dried by the sandwiching and conveying portion 55 is peeled off from the heating surface 501 by the scraping member 56. Then, the dry paper is sandwiched between the sandwiching belt 52 and the sandwiching roller 57, sent downward, and conveyed to the finishing portion 6.

According to the papermaking apparatus of the present embodiment, the heating carrier 50 is provided so that the heating surface 501 is in contact with the contact surface of the wet paper W with the papermaking belt 41, so that the heating carrier 50 is in contact with the papermaking belt 41. The back surface of the wet paper W is conveyed in contact with the smooth heating surface 501. Therefore, the unevenness of the mesh of the papermaking belt 41 is transferred to the back surface of the wet paper W by contact with the papermaking belt 41, but the back surface of the wet paper W is in contact with the smooth heating surface 501 in the drying portion 5. By heating with, the unevenness on the back surface of the wet paper W is reduced. Therefore, it is possible to prevent the mesh pattern of the papermaking belt 41 from being formed on the paper.

Further, the angle A formed by the upstream side in the traveling direction of the wet paper W in the receiving portion 53 at the front end of the wet paper W and the downstream side in the wet paper transport direction in the receiving portion 53 of the heating carrier 50 is set to 90 degrees or more. Therefore, it is possible to prevent the front end of the wet paper W from being bent and causing poor transportation. Therefore, the wet paper W peeled off from the papermaking belt 41 can be efficiently received and conveyed by the drying unit 5.

Further, the effect obtained by the same configuration as the papermaking apparatus according to each of the above-described embodiments is the same as that of each of the above-described embodiments in this embodiment.

<Fourth Embodiment>
Based on FIG. 10, the papermaking apparatus according to the fourth embodiment will be described focusing on a configuration different from each of the above embodiments. The parts and parts having the same configuration as those of the above embodiments are designated by the same reference numerals. FIG. 10 is a front view of the papermaking section 4 and the drying section 5 according to the present embodiment.

As shown in FIG. 10, in the present embodiment, the heating carrier 50 is provided below the support roller 40a. That is, the heating carrier 50 is provided at a position lower than the support roller 40.

The holding belt 52 is driven and traveled in the traveling direction indicated by the arrow X6 by a driving means (not shown). Further, the heating carrier 50 is driven to rotate in the rotation direction indicated by the arrow X7 as the holding belt 52 travels.

The support roller 40a in the present embodiment is provided at a position lower than that of the opposing roller 441. Therefore, when the papermaking outbound route 410 is viewed from the head box 42 on the downstream side in the wet paper transport direction, the papermaking outbound route 410 from the dehydration section 44 to the support roller 40a reaches the dehydration section 44. It is inclined downward with respect to the outward route 410.

Further, in the papermaking operation, a guide plate (not shown) for guiding the liquid to the white water tank 46 is provided so that the liquid such as white water falling from the papermaking belt 41 does not adhere to the drying portion 5. The guide plate is provided between the papermaking belt 41 and the drying portion 5.

The front end of the wet paper W peeled off from the papermaking belt 41 is deflected at the delivery portion S from the state shown by the solid line in FIG. 10 to the state of W1 shown by the alternate long and short dash line. The front end of the wet paper W in the state of W1 indicated by the alternate long and short dash line is received by the heating carrier 50. The receiving portion 53 is composed of a heating surface 501 of a heating transport body 50 that is driven and rotated on the upstream side of the sandwiching transport portion 55 in the wet paper transport direction.

Since the heating carrier 50 is provided at a position lower than the support roller 40, the receiving portion 53 is provided at a position lower than the final contact position E between the papermaking belt 41 and the wet paper W.

Further, the heating carrier 50 of the present embodiment is provided so that the heating surface 501 is in contact with the contact surface of the wet paper W with the papermaking belt 41, as in the third embodiment.

As shown in FIG. 10, the front end of the wet paper W deflected to the state of W1 indicated by the alternate long and short dash line, the upstream side in the traveling direction of the wet paper W in the receiving portion 53, and the wet paper transport in the receiving portion 53 of the heating carrier 50. The angle A formed by the downstream side in the direction is set to be an obtuse angle of less than 180 degrees.

The upstream side of the wet paper W in the receiving portion 53 at the front end of the wet paper W in the traveling direction is indicated by the back surface of the wet paper W located on the upstream side in the wet paper transport direction (upper left side of the receiving portion in FIG. 10) from the receiving portion 53. Is done. Further, the downstream side of the receiving portion 53 of the heating transport body 50 in the wet paper transport direction is indicated by a tangent line on the heating surface 501 with the receiving portion 53 as a contact, which is drawn to the right side of the receiving portion 53 in FIG.

Similar to the wet paper detecting means 54 in each of the above embodiments, the wet paper detecting means is also provided in this embodiment, but the illustration is omitted in FIG. As shown in FIG. 10, the wet paper detecting means in the present embodiment is provided so as to detect the wet paper W inclined downward from the horizontal.

According to the papermaking apparatus of the present embodiment, the heating carrier 50 has a receiving portion 53, and the receiving portion 53 is provided at a position lower than the final contact position E between the papermaking belt 41 and the wet paper W. Therefore, the wet paper W that is about to hang down due to its own weight can be easily received by the receiving unit 53, and an error in delivering the wet paper W to the drying unit 5 can be suppressed. Therefore, the wet paper W peeled off from the papermaking belt 41 can be easily delivered to the drying portion 5.

Further, the angle A formed by the upstream side in the traveling direction of the wet paper W in the receiving portion 53 at the front end of the wet paper W and the downstream side in the wet paper transport direction in the receiving portion 53 of the heating carrier 50 is set to 90 degrees or more. Therefore, it is possible to prevent the front end of the wet paper W from being bent and causing poor transportation. Therefore, the wet paper W peeled off from the papermaking belt 41 can be efficiently received and conveyed by the drying unit 5. Further, since the receiving portion 53 is provided at a position lower than the final contact position E between the papermaking belt 41 and the wet paper W, the receiving portion 53 can easily receive the wet paper W that is about to hang down due to its own weight. It is possible to suppress a mistake in delivery of the wet paper W to the drying portion 5. Therefore, the wet paper W peeled off from the papermaking belt 41 can be easily delivered to the drying portion 5.

Further, the effect obtained by the same configuration as the papermaking apparatus according to each of the above-described embodiments is the same as that of each of the above-described embodiments in this embodiment.

<Other Embodiments>
In each of the above embodiments, the arrival position and the transport distance of the wet paper W are determined by counting the elapsed time with the counter of the control unit 7, but instead of counting the elapsed time, the papermaking belt 41 and the holding are held. The arrival position and the transport distance of the wet paper W may be determined by driving and traveling the belt and counting the number of rotation pulses of each drive means.

The present invention is not limited to the configuration described in each of the above embodiments, and may include various forms that can be considered by those skilled in the art without departing from the contents described in the claims.

1 Paper making device 4 Paper making part 5 Drying part 7 Control part 40, 40a Support roller 41 Paper making belt 44 Dehydrating part 45 Peeling part 50 Heating carrier 51, 51a, 51b Elevated support roller 52 Holding belt 53 Receiving part 54 Wet paper detecting means 55 Holding and transporting unit 410 Paper-making outbound route 410a Curved traveling part 411 Paper-making return route 440 Pressing roller 441 Opposing roller 450 Peeling point 501 Heating surface 520 Drying outbound route 521 Drying inbound route 530 Receiving point 540 Light emitting sensor 541 Light receiving sensor A angle E Final contact position R Radiation radius S Delivery part T Wet paper front edge thickness W Wet paper

Claims (14)

A papermaking apparatus including a papermaking section for making a pulp suspension and producing wet paper, and a drying section for drying wet paper to produce paper.
The papermaking portion includes an endless papermaking belt, and has a peeling portion from which the front end of the wet paper is peeled off from the papermaking belt.
The papermaking belt includes a papermaking outbound route that supports and conveys wet paper, and a papermaking inbound route that circulates at the beginning of the papermaking outbound route after contact with the wet paper.
The drying portion has a heating carrier for transporting the wet paper while heating it on the heating surface, and a holding belt for sandwiching and transporting the wet paper between the heating and transporting bodies .
The drying portion is provided with a receiving portion that receives the wet paper peeled from the papermaking belt at the peeling portion on the heating surface of the holding belt or the heating carrier.
The papermaking belt is a papermaking device provided at a predetermined distance from the receiving portion. A papermaking device including a papermaking section for making a pulp suspension and producing wet paper, and a drying section for drying wet paper to produce paper. The papermaking section is provided with an endless papermaking belt. The papermaking belt has a peeling portion from which the front end of the wet paper is peeled off from the papermaking belt, and the papermaking belt circulates to the starting end of the papermaking outbound route that carries and conveys the wet paper, and after finishing contact with the wet paper. The drying section includes a receiving section for receiving the wet paper peeled from the paper making belt at the peeling section, and a heating carrier for transporting the wet paper received at the receiving section while heating on the heating surface. The papermaking belt is provided at a predetermined distance from the receiving portion. The papermaking apparatus according to claim 1 or 2 , wherein the papermaking section is provided in the middle of the papermaking outbound route and includes a dehydration section for dehydrating wet paper. The papermaking belt has a curved traveling portion that is hung on a plurality of support rollers and that curves along the support rollers located at the end of the papermaking outbound route.
The papermaking apparatus according to any one of claims 1 to 3, wherein the peeling portion is provided on the curved traveling portion. The papermaking apparatus according to claim 4 , wherein in the curved traveling portion, the papermaking belt has a predetermined radius of curvature that can be peeled off from the papermaking belt in which the front end of the wet paper is curved and traveled by the waist of the wet paper. The papermaking according to any one of claims 2 to 5 , wherein the drying portion includes an endless holding belt that sandwiches and conveys the wet paper received by the receiving portion with the heating carrier. Device. The papermaking apparatus according to any one of claims 1 to 6, wherein the receiving portion is provided at a position lower than the final contact position where the papermaking belt ends contact with the wet paper. A gap is provided between the peeling portion and the receiving portion.
The papermaking apparatus according to claim 6 or 7 , wherein the distance between the gaps is set to be equal to or less than the thickness of the front edge of the wet paper at the peeling portion. A delivery portion is provided between the papermaking portion and the drying portion so that the front end of the wet paper peeled from the papermaking belt can be deflected toward the receiving portion by its own weight. 8. The papermaking apparatus according to any one of 8. The angle between the upstream side of the front end of the deflected wet paper in the receiving portion in the traveling direction and the downstream side in the receiving portion of the heating carrier or the holding belt in the wet paper transport direction is 90 degrees or more. The papermaking apparatus according to claim 9, which is set in 1. The papermaking apparatus according to any one of claims 1 to 10, wherein the heating carrier is provided so that the heating surface is in contact with the contact surface of the wet paper with the papermaking belt. Web transfer speed of the clamping belt, the is set faster than the web transfer speed of the paper belt, according to claim 1, claim 6, claim 7 or 11 quoting claim 1 or claim 6 The papermaking apparatus according to any one of the above. The papermaking apparatus according to any one of claims 1 to 12, wherein the wet paper transport speed of the heating carrier is set to be faster than the wet paper transport speed of the papermaking belt. The papermaking apparatus according to any one of claims 1 to 13, further comprising a wet paper detecting means for detecting that the wet paper peeled off from the papermaking belt has been delivered to the receiving portion.

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