JPH0798377B2 - ▲ Ro ▼ Paper molding method and molding equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter paper forming method and a forming apparatus, and more particularly to a method and an apparatus for forming a filter paper into a circular shape accurately at high speed.

BACKGROUND OF THE INVENTION Filter papers that separate and remove solid particles from liquids or solids are currently used in a wide range of technical fields. Such filter papers are manufactured from various materials and formed into various shapes so as to suit the purpose of use. Generally, industrial filter paper is formed into a predetermined shape and then housed in a container,
Used as a filtration device. Therefore, it is desirable that the characteristics of the filter device are that the fluid is uniformly filtered and the performance is high in each part of the filter element. In order for a filtering device used as an air filter of an automobile engine to exhibit high performance characteristics, the filter paper must always maintain a predetermined shape as a filter element.

A conventionally manufactured filter element, after being formed into a predetermined shape, expands slightly due to its elasticity when housed in a container. In this state, the folds formed on the filter paper also partially expand. Therefore, a portion with a large fold spacing and a portion with a small fold spacing are formed. This causes the fluid flow through the filter element to be partially non-uniform.

On the other hand, in order to manufacture a small-sized filter device in response to the demand for downsizing of the filter device, basically, it is only necessary to design the filter paper itself to be small, but if it is simply reduced, the filtering area is reduced and the filtering performance is reduced. Is reduced. When a filter element made of multi-layer filter paper is installed in the filter device for the purpose of manufacturing a small filter device with a large filtration area, the pressure difference between the filter element and the filter element becomes large, and therefore high pressure is applied to the liquid to be filtered. Otherwise, the liquid cannot pass through the filter paper. Further, in such a filtering device, a large pump is required to circulate the liquid. Therefore, in order to make a compact and high-performance filtering device, forming a large number of folds on the filter paper and increasing the contact area with the liquid to be filtered are important conditions for manufacturing an excellent filtering device. ing. Thus, the shape and spacing of the filter paper folds are determined by the nature and flow rate of the fluid to be filtered, the size or nature of the filtered solids, and the like.

In a conventional apparatus for forming a filter paper having a large number of folds, for example, as shown in JP-B-57-7806, two marking rollers for forming a fold line on the filter paper, and these marking rollers. And two drive rollers arranged behind the marking roller and moving the strip, and two opposing rollers facing each other and pressed from the opposite side of the strip, and behind the drive rollers. The guide path is provided and has two smooth surfaces that gradually converge in the traveling direction, and a large number of guide ribs that are provided on the two converging surfaces and that are high in the traveling direction.

Further, in Japanese Patent Laid-Open No. 61-291015, a ridge portion of the filter element is closed at one end portion to open a valley portion, and at the same time, the other end portion of the fold portion is opened. Thus, the trough is closed to allow the fluid to flow not only from the upper surface of the fold portion of the filter element but also from one end thereof and flow out to the lower surface of the fold portion and the other end. With this filter element, it is possible to secure a wide fluid passage surface inside and outside the filter element, and moreover, the fluid flows along the folds of the filter element, and also flows diagonally in each fold of the folds, and There is no sudden change in. Therefore, the flow resistance of the fluid can be reduced.

Problems to be Solved by the Invention By the way, the filter element disclosed in Japanese Patent Publication No. 57-7806 has a drawback that it cannot maintain a predetermined shape.
That is, in this filter element, after the fold line is formed, the filter paper is stretched by the drive roller, and is further forcibly conveyed backward while frictionally contacting with a number of guide ribs in the converging guide path. It Therefore, when the filter paper is stretched by the drive roller, the folding line of the filter paper tends to recover elastically to a flat shape, so that the folding resistance increases and the filter paper is forcibly folded at the portion where the folding line is not formed. Occurs. Further, since the filter paper is forcibly moved by the drive roller while being in frictional contact with the guide ribs, the filter paper sticks to the guide path, that is, jams, during the conveyance of the filter paper, especially when the filter paper cannot be folded along the correct folding line. As a result, a failure that cannot be carried occurs. Therefore, it is necessary to stop the operation of the device, remove the jammed filter paper, adjust the respective parts of the device, and then restart the device. Conventionally, it takes a long time to repair such a failure. Furthermore, the formed filter element, when discharged from the device, partially expands due to its elasticity, resulting in a non-uniform crease spacing as a whole.

On the other hand, the crimped filter paper bent at a portion other than the correct folding line is discarded as a defective product in view of quality control of the product, so that the product yield is disadvantageously reduced. Therefore, there has been a demand for a technique for accurately and surely bending a filter paper into a predetermined shape so that a filter paper having a large number of folds can be accurately molded at a high speed.

Since the filter element formed by the above-mentioned conventional device has a structure that retains the shape of the filter element by the strength of the filter paper itself, it has a shape that is easily deformed, which is not only inconvenient to handle but also used as a filter element. There was a possibility of deformation while doing. A conventionally manufactured filter element, after being formed into a predetermined shape, expands slightly due to its elasticity when housed in a container. In this state, the folds formed on the filter paper also partially expand. Therefore, a portion with a large fold spacing and a portion with a small fold spacing are formed. This causes the fluid flow through the filter element to be partially non-uniform.

On the other hand, the Applicant has developed a filter element that holds the filter element in a predetermined shape by applying an adhesive to the filter paper. This filter element is disclosed in JP-A-61-291015. In order to form the filter element into a predetermined circular shape by applying the adhesive to the filter paper, the filter element must be manufactured in consideration of characteristics such as paper quality and folding structure of the filter paper. However, heretofore, since no apparatus has been proposed for forming a filter paper coated with an adhesive into a pleated shape having a constant pitch, the filter element developed by the present applicant could not be automatically manufactured.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a filter paper molding method and a molding apparatus capable of eliminating the above-mentioned drawbacks and accurately molding a filter paper into a predetermined fold shape at a high speed.

Means for Solving the Problems In the filter paper molding method according to the present invention, the surface of the band-shaped filter paper (6 ') is partially pressed to form linear recesses (7) on the surface of the band-shaped filter paper (6'). Edging process and linear recess (7)
Adhesive applying step of applying the adhesive (10) along the edges of the front and back surfaces of the band-shaped filter paper (6 ') on which the tape-shaped filter paper (6') is formed, and the band-shaped filter paper (6 ') is bonded by applying a buckling force in the traveling direction. Agent (10)
A band-shaped filter paper (6 ') coated with the resin is folded at the linear recess (7) to form the filter paper (6), and a rotary shaft (11, 12) is provided in the transport direction of the filter paper (6). And a pair of screw drums (13, 13) arranged on both sides of the filter paper (6) and rotating.
By conveying the folded portion (6e) of the filter paper (6) between the threads (15) formed with the decreasing pitch of (14), the opposing surfaces (16) of the filter paper (6) that are folded and overlapped. , 17) are crimped and bonded to each other.

Further, the filter paper forming apparatus according to the present invention has a shape complementary to the linear concave portion (7) to be formed on the surface of the band-shaped filter paper (6 ') and is substantially perpendicular to the length direction of the band-shaped filter paper (6'). Rotating drum (9) having linear protrusions (8)
Edging device (2), an adhesive supply device (3) for applying the adhesive (10) along the edges of the front and back surfaces of the band-shaped filter paper (6 '), and the adhesive (10) is not attached A folding device (4) which comes into contact with a part of the band-shaped filter paper (6 ') and gives a buckling force in the traveling direction to the band-shaped filter paper (6') to bend the band-shaped filter paper (6 ') at the linear recess (7), 6 ') is provided with a pair of screw drums (13, 14) having rotating shafts (11, 12) in the conveying direction and arranged on both sides of the band-shaped filter paper (6'), and rotating screw drums (13, The folds (6) of the filter paper between the threads (15) formed with a decreasing pitch of (14)
By transporting e), it is constituted by a crimping device (5) for crimping and adhering the facing surfaces (16, 17) of the folded and stacked filter papers (6) to each other.

Function In the filter paper molding method according to the present invention, the surface of the band-shaped filter paper (6 ') is partially pressed to form the linear recessed part (7) on the surface of the band-shaped filter paper (6'), and then the linear recessed part (7) is formed. ) Formed along the edges of the front and back surfaces of the band-shaped filter paper (6 ′).
0) is applied, and then the belt-shaped filter paper (6 ′) coated with the adhesive (10) is applied smoothly to the belt-shaped filter paper (6 ′) by a linear recess (7). Can be folded. In addition, the pitches of the pair of screw drums (13, 14), which have rotating shafts (11, 12) in the conveying direction of the band-shaped filter paper (6 ') and are arranged on both sides of the band-shaped filter paper (6') and rotate, decrease. Filter paper (6) between the threads (15) formed by
By transporting the bent portion (6e), the facing surfaces (16, 17) of the folded and stacked filter papers can be reliably pressed and bonded to each other.

Further, in the filter paper forming apparatus according to the present invention, the folding device (4) applies a buckling force in the traveling direction to the band-shaped filter paper (6 ') to bend the band-shaped filter paper (6'), Opposing surfaces (16, 16) of the filter paper (6) to which the adhesive (10) is attached between the screw threads (15) of a pair of rotating screw drums (13, 14) arranged on both sides of the band-shaped filter paper (6 '). 1
Since the 7) are pressed together, the filter paper (6) is formed into a filter element having a predetermined shape.

Practical Examples Hereinafter, an embodiment of the filter paper molding apparatus according to the present invention will be described with reference to FIGS.
FIG. 17 will be described. The filter element shown in FIGS. 16 and 17 has substantially the same shape as the filter element shown in Japanese Patent Publication No. 61-291015. That is, the filter paper 6 formed as a filter element has a peak portion 6a and a valley portion 6b.
A large number of folds consisting of folds are formed, and both slopes (opposing surfaces 16 and 17) of each mountain portion at one end of the folds are brought close to each other, and the top surface of the inner surface of the mountain portion of the fold is joined to a predetermined position. One joint 6c is formed, and both slopes (opposite surfaces 16 and 17 on the back side) of each valley at the other end of the fold are brought close to each other, and the bottom of the inner surface of the fold of the fold is joined to a predetermined position. Then, the second joint 6d is formed. The filter element shown in FIGS. 16 and 17 is manufactured from the band-shaped filter paper 6'shown in FIG. The band-shaped filter paper 6'has a linear concave portion 7 having a V-shaped upper linear concave portion 7a on the front surface and a Y-shaped lower linear concave portion 7b on the rear surface.

As shown in FIG. 1, the filter paper molding apparatus 1 of the present invention includes an edging device 2, an adhesive supply device 3, and a folding device 4.
And a crimping device 5. The edging device 2 has a pair of linear protrusions 8 having a shape complementary to the linear recesses 7 to be formed on the surface of the band-shaped filter paper 6'and projecting in a direction substantially perpendicular to the length direction of the band-shaped filter paper 6 '. The rotary drum 9 of FIG. The adhesive supply device 3 applies the thermoplastic adhesive 10 along the edges of the front surface and the back surface of the band-shaped filter paper 6 ′ on which the linear recesses 7 are formed. The folding device 4 comes into contact with a part of the band-shaped filter paper 6 ′ to which no adhesive is attached and gives a buckling force in the traveling direction to the band-shaped filter paper 6 ′ to bend at the linear recess 7. As shown in FIG. 4, the crimping device 5 has rotating shafts 11 and 12 arranged in parallel with the conveying direction of the band-shaped filter paper 6'and a pair of screw drums 13 arranged on both sides of the band-shaped filter paper 6 '. ,14
Is provided. As shown in FIG. 6, the crimping device 5 is bent by conveying the bent portion 6e of the filter paper 6 between the screw threads 15 formed at the decreasing pitch of the rotating screw drums 13 and 14, and The facing surface 16 of the stacked filter papers 6,
The opposing surfaces 16 and 17 are adhered to each other with the adhesive 10 by pressing the 17 together.

As shown in FIG. 2, the filter paper forming apparatus 1 has a frame 20, and in front of the frame 20, a roll of belt-shaped filter paper 6'rotatably on an axis supported by the frame 20 or another holding device. (Not shown) is supported. The band-shaped filter paper 6 ′ pulled out from the roll is supplied to the edging device 2.
The rotary drum 9 of the edging device 2 has a pair of edging drums 21 and 22 for press-molding the linear concave portion 7 in a direction substantially perpendicular to the length direction of the band-shaped filter paper 6'on the band-shaped filter paper 6 '. The edging drums 21 and 22 are supported on shafts 23 and 24 which are rotatably mounted on the frame 20 above and below the strip filter paper 6 ', respectively.

As shown in FIG. 15, the plurality of linear recesses 7 are substantially perpendicular to the length direction of the band-shaped filter paper 6 ', but about θ = ± 3.
Has a line inclined at an angle of ~ 10 °. In addition, the linear recess 7
The linear protrusions 25 of the edging drum 21 and the linear protrusions 26 of the edging drum 22 are pressed against the strip-shaped filter paper 6 ′ from above and below by a predetermined angular interval, so that the strip-shaped filter paper 6 ′ is lined from the surface. Shaped concave portions 7 are formed so as to be alternately depressed in the width direction. The linear recessed portion 7 has an upper surface linear recessed portion 7a and a lower surface linear recessed portion 7b that are pressed from above and below, respectively. Therefore, the edging drum 21 is provided with the linear protrusions 25 forming the upper surface linear concave portions 7a shown by solid lines in FIG. 1, and the edging drum 22 is provided with the lower surface linear protrusions 7b shown by dotted lines in FIG. A linear protrusion 26 to be formed is provided.

The band-shaped filter paper 6 ′ on which the linear recesses 22 and 23 are formed by the edging device 2 is sent to the adhesive supply device 3. The adhesive supply device 3 is fixed to the frame 20, and as shown in FIG.
It has a reversing device 30 for reversing the direction of the band-shaped filter paper 6'and a pair of adhesive application devices 31. The reversing device 30 has two rollers 32 and 33 for directing the back surface of the strip-shaped filter paper 6'upward, and one roller 34 for redirecting the surface of the strip-shaped filter paper 6'upward again. The adhesive applying device 31 is arranged between the rollers 33 and 34 and has an adhesive supply pipe 35 for applying a synthetic resin adhesive to the back surface of the band-shaped filter paper 6 ′, and the surface of the band-shaped filter paper 6 ′ behind the roller 34. And an adhesive supply pipe 36 for applying an adhesive thereto. The pressure-fused and melted adhesive is pressure-fed to the adhesive supply pipes 35 and 36 from an adhesive supply source (not shown), and the adhesive 10 is linearly attached to each of the front surface and the back surface of the band-shaped filter paper 6 '. To be done.

The band-shaped filter paper 6 ′ thus coated with the adhesive 10 is sent to the folding device 4 mounted on the frame 20. As shown in FIGS. 4 and 7, the folding device 4 has a pair of opposed rollers 40 mounted coaxially on the horizontal axis. Each roller
Each of the rollers 40 has a pair of rollers 40 facing each other vertically. The roller 40 contacts the surface of the band-shaped filter paper 6'on which the adhesive 10 is not attached, and applies a buckling force in the traveling direction to the band-shaped filter paper 6 '. The crimping device 5 is attached to the frame 20 behind the folding device 4, and the speed at which the crimping device 5 conveys the filter paper 6 is slow. Therefore, the rotation of the roller 40 of the folding device 4 causes the band-shaped filter paper 6 ′ to be linear. The filter paper 6 is formed by folding it into a fold shape at the recess 7.

As shown in FIGS. 4 and 5, the pair of screw drums 13 and 14 of the crimping device 5 have rotating shafts 11 and 12 having different heights from each other, and as shown in FIG. The screw thread 15 of the screw drum 14 engages with the recess 50 on the front surface of the filter paper 6, and the screw thread 15 of the screw drum 14 has the recess 51 on the back surface of the filter paper 6.
(Figs. 16 and 17). As shown in FIG. 7, the pitch of the threads 15 formed on the screw drums 13 and 14 gradually decreases in the traveling direction of the filter paper 6 at the rear of the decreasing pitch portion 52 and the decreasing pitch portion 52, respectively. And the formed constant pitch portion 53. Opposing surfaces 16 and 17 of the filter paper 6 conveyed between the threads 15 of the constant pitch portion 53 are pressure-bonded,
It is firmly bonded with the adhesive 10.

Next, the fold-shaped filter paper 6 is sent from the pressure bonding device 5 to the straightening / conveying device 60. As shown in FIG. 8, the straightening / conveying device 60 is provided with drive belts 61, 62, 63 and 64 which come into contact with the upper surface, the lower surface and both side surfaces of the filter paper 6 and convey the filter paper 6 in the traveling direction.
The filter paper 6 moves smoothly. As shown in FIG. 13, the straightening / conveying device 60 has an adhesive curing device 65 for supplying cold air and warm air to the filter paper 6 while the filter paper 6 is being conveyed. Adhesive curing device 65
By supplying cold air of 5 ° C. and hot air of 80 ° C. to the filter paper 6, the curing of the thermoplastic adhesive 10 is accelerated. In the straightening / conveying device 60, the adhesive may not be completely cured when the screw drums 13 and 14 are pressure-bonded, and the pitch of the fold-shaped filter paper 6 may become uneven.
It has a function of hardening the adhesive 10 within a short time to hold the filter paper 6 in a predetermined shape. Further, the drive belt of the straightening / conveying device 60 adjusts the pitch between the crests of the fold-shaped filter paper 6, so that the conveying speed of the drive belt can be adjusted by controlling the rotation speed of the motor or switching the clutch and the speed reducer. it can.

In the above-described structure, the band-shaped filter paper 6 ′ pulled out from the roll has the linear recess 7 formed between the edging drums 21 and 22 of the edging device 2. After that, the adhesive 10 is linearly attached to the front surface and the back surface of the band-shaped filter paper 6 ′ from the adhesive supply pipes 35 and 36 of the adhesive supply device 3. In this state,
The roller 40 of the folding device 4 in the direction of the crimping device 5 is adhesive 10
Is brought into contact with the surface of the band-shaped filter paper 6'which is not adhered, and a buckling force in the traveling direction is applied to the band-shaped filter paper 6 ', so that the band-shaped filter paper 6'is folded at the linear recess 7 into a fold shape. The folded filter paper 6 is crimped at a predetermined pitch by the screw thread 15 of the crimping device 5 having the gradually decreasing decreasing pitch part 52 and the constant pitch part 53 formed behind the decreasing pitch part 52, To be glued. Then, the straightening and conveying device 60 causes the filter paper 6 to
During transportation, the pitch of the peaks and valleys of the filter paper 6 is corrected by heating with warm air.

In this embodiment, the filter paper 6 is further processed. That is, the filter paper 6 discharged from the straightening / conveying device 60 is supplied to the cutting device 70 shown in FIGS. 9 and 10. The cutting device 70 is a pleated filter paper.
It has a function of cutting 60 into a predetermined length. Cutting device 70
Is a motor 71, a forward / reverse clutch 66 drivingly connected to the motor 71, a clutch clutch brake 67 drivingly connected to the forward / reverse clutch 66, a feed ball screw 72 connected to a drive shaft of the clutch brake 67, And a movable support device 73 that meshes with the feed ball screw 72. Furthermore, the cutting device 70
Air cylinders 74 and 75 mounted on movable support 73
And a rotatable blade 76 attached to air cylinders 74 and 75. Further, as shown in FIG. 11, the cutting device 70 is a light reflection type sensor 77 for detecting the top of the mountain portion of the filter paper 6.
And a light transmission sensor 78 connected to a counter for counting the number of peaks of the filter paper 6.

In the above configuration, when the sensor 78 counts a predetermined number of peaks of the filter paper 6, the motor 71 is operated and the blade 76 causes the filter paper 6 to move.
It is moved at the same speed as the transport speed of and in the same direction as the filter paper 6. At the same time, the blade 76 is rotated and the air cylinders 74 and 75 are operated, so that the blade 76 moves vertically upward, and at the same time, moves to a certain height and then at a right angle to the conveyance direction of the filter paper 6. That is, it is horizontally moved to the right from the position shown in FIG. When the filter paper 6 is cut by the conveyance direction, the vertical direction and the horizontal direction movement of the blade 76, a limit switch (not shown) is operated by the support portion of the blade 76 to stop the movement so as to cut the next filter paper 6. , To the first position on the lower left and forward.

Further, as shown in FIG. 14, the filter paper 6 cut into a predetermined length is formed into a circular shape by the circling device 80. This is because the filter element formed of the filter paper 6 is housed in the metal annular case. Shark ring device 80
Has a pair of screw drums 81 and 82. The screw drum 81 has a thread 83 formed at equal intervals and a thread 83
Conical portion 84 behind 83 and having an enlarged diameter
Have. No threads are formed on the conical portion 84. Also,
The screw drum 82 has threads 85 that are evenly spaced.
And a conical portion 86 behind the thread 85 and having a reducing diameter. Reduced pitch 87 in cone 86
Is formed. Therefore, the fold-shaped filter paper 6 has a curved shape with a substantially constant curvature as shown by a chain line in FIG.
The sac ring device 80 is provided with a warm air supply device 88 extending between the screw drums 81 and 82, and when the shape of the filter paper 6 is deformed by the screw threads of the screw drums 81 and 82, the adhesive 10 is temporarily removed. Soften.

As can be understood from the above description, when the filter paper 6 is molded according to the present invention, the surface of the band-shaped filter paper 6'is partially pressed to form the linear recess 7 on the surface of the band-shaped filter paper 6 '. Band-shaped filter paper 6'pulled out from a coiled roll
The edging forms linear recesses 7 on the front surface and the back surface, which are bent lines, at regular intervals. Then, the linear recess 7
The band-shaped filter paper 6'formed with the above is turned over during transportation, and the adhesive 10 is applied along the edges of the front and back surfaces of the band-shaped filter paper 6 '.
The adhesive 10 is linearly applied along the edges of the front and back surfaces of the band-shaped filter paper 6 '. In this state, a buckling force in the traveling direction is applied to the band-shaped filter paper 6 ′, and the band-shaped filter paper 6 ′ coated with the adhesive 10 is bent at the linear concave portion 7 to form the filter paper 6. In this state, the peaks 6a and the valleys 6b are formed on the filter paper 6. Furthermore,
A pair of screw drums 13 having rotating shafts 11 and 12 in the transport direction of the filter paper 6 and arranged on both sides of the filter paper 6 and rotating;
By crimping the folds 6e of the filter paper 6 between the threads 15 formed with a decreasing pitch of 14 crimping and adhering the opposite faces 16, 17 of the folded and stacked filter paper 6 to each other. It consists of a process and.

By partially pressing the surface of the band-shaped filter paper 6 ', the band-shaped filter paper 6'
After the linear concave portion 7 is formed on the surface of the strip-shaped filter paper, the adhesive 10 is applied along the edges of the front surface and the back surface of the strip-shaped filter paper 6 ′ having the linear concave portion 7 formed thereon. The belt-shaped filter paper 6 ′ coated with the adhesive 10 by applying the buckling force can be smoothly bent at the linear recess 7. Further, the belt-shaped filter paper 6'has rotating shafts 11 and 12 in the conveying direction of the belt-shaped filter paper 6 '.
A pair of screw drums arranged on both sides of and rotating
By conveying the folded portion 6e of the filter paper 6 between the threads 15 formed with a decreasing pitch of 13 and 14, the folded and overlapped facing surfaces 16 and 17 of the filter paper 6 are securely crimped together. And can be glued. Since the facing surfaces 16 and 17 of the filter paper 6 are brought into close contact with each other via the adhesive 10, the filter paper 6 is formed into a predetermined shape, and this shape does not deform after the adhesive 10 is solidified.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to accurately and accurately form a filter paper which is held in a predetermined shape by an adhesive. That is, after the filter paper coated with the adhesive is bent, the opposing surfaces of the filter paper are brought into close contact with each other, so that the filter paper is formed into a predetermined shape, and this shape is not deformed for a long time after the adhesive is solidified.
Therefore, the filter element formed from this filter paper does not partially have nonuniform filtration performance. A folding device applies a buckling force to the filter paper in the traveling direction to bend the filter paper, and the crimping device mechanically faces the filter paper between the threads of a pair of screw drums that are arranged on both sides of the filter paper and rotate. Because of the crimping, the filter paper is formed into a filter element having exactly the predetermined shape. Therefore, it can be understood that the filter paper forming apparatus of the present invention is suitable for mass production of filter elements having a predetermined shape.

[Brief description of drawings]

FIG. 1 is a perspective view showing the concept of a filter paper molding apparatus according to the present invention, FIG. 2 is a side view of the filter paper molding apparatus, FIG. 3 is a side view of an edging apparatus, and FIG. 4 is a plane view of a folding apparatus and a crimping apparatus. FIG. 5 is an end view of the crimping device, and FIG. 6 is a partial view showing a state in which band-shaped filter paper is formed into a fold shape by a screw drum,
FIG. 7 is a side view of the screw drum, FIG. 8 is a sectional view of the straightening and conveying device, FIG. 9 is a side view of the cutting device, FIG. 10 is a sectional view of the cutting device, and FIG. 11 is a perspective view of the cutting device. FIG. 12 is a side view of the straightening and conveying device, FIG. 13 is a cross-sectional view of the straightening and conveying device, FIG. 14 is a plan view of the circling device, FIG. 15 is a plan view of a filter paper having linear recesses, and FIG. FIG. 17 is a perspective view of the formed filter element viewed from one direction, and FIG. 17 is a perspective view of the filter element viewed from the other direction. 1 ... Filter paper forming device, 2 ... Edging device, 3 ... Adhesive supply device, 4 ... Bending device, 5 ... Crimping device, 6
…… Filter paper, 6 ′ …… Band-shaped filter paper, 6e …… Bent part, 7 ……
Linear recess, 8 ... Linear projection, 9 ... Rotating drum, 10 ...
Adhesive, 11, 12 …… Rotary shaft, 13,14 …… Screw drum, 15 …… Screw, 16,17 …… Opposed surface, 21,22 …… Edging drum, 25,26 …… Linear projection,

Claims (6)

[Claims] 1. An edging step of partially pressing the surface of a band-shaped filter paper to form linear recesses on the surface of the band-shaped filter paper, and bonding along the edges of the front and back surfaces of the band-shaped filter paper having the linear recesses. Adhesive applying step of applying the agent, a folding step of forming a filter paper by bending the belt-shaped filter paper coated with the adhesive by applying a buckling force in the traveling direction to the band-shaped filter paper, and forming a filter paper, By conveying the folded portion of the filter paper between the threads formed by the decreasing pitch of a pair of rotating screw drums having a rotation axis in the conveying direction and arranged on both sides of the belt-shaped filter paper, the folded and overlapped portions are folded. And a pressure-bonding step of pressure-bonding and adhering opposing surfaces of the obtained filter paper to each other. 2. An edging device provided with a rotary drum having a linear projection having a shape complementary to a linear concave portion to be formed on the surface of a band-shaped filter paper and having a linear projection protruding substantially at right angles to the length direction of the band-shaped filter paper. , An adhesive supply device that applies adhesive along the edges of the front and back surfaces of the band-shaped filter paper, and a part of the band-shaped filter paper to which no adhesive is attached, and gives a buckling force in the traveling direction to the band-shaped filter paper. A folding device that bends at the linear recess and a pair of screw drums that have a rotation axis in the conveyance direction of the band-shaped filter paper and that are arranged on both sides of the band-shaped filter paper are provided, and are formed at a decreasing pitch of the rotating screw drum. And a crimping device for crimping and adhering the opposite surfaces of the folded and stacked filter papers to each other by conveying the folded portion of the filter paper between the threads. 3. The filter paper forming apparatus according to claim 2, wherein the edging device has a pair of edging drums which are arranged on both sides of the band-shaped filter paper and form linear recesses on both surfaces of the filter paper. 4. The filter paper forming apparatus according to claim 2, wherein the adhesive supply device has a reversing roller for reversing the band-shaped filter paper. 5. The pair of screw drums of the crimping device have rotating shafts of different heights, the screw thread of one screw drum engages with the depression of the surface of the band-shaped filter paper, and the screw screw of the other screw drum. The filter paper molding device according to claim (4), wherein the mountain engages with a recess on the back surface of the belt-shaped filter paper. 6. The pitch of the threads formed on the screw drum has a decreasing pitch portion gradually decreasing with respect to the traveling direction of the filter paper and a constant pitch portion formed behind the decreasing pitch portion. The filter paper molding apparatus according to item (4).