JP3477323B2 - Double facer paper presser - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double facer of a corrugating machine for producing corrugated board sheets,
The present invention relates to a paper holding device for a double facer for applying a pressing force required when bonding a single-sided corrugated board sheet and a liner.

[0002]

2. Description of the Related Art FIG. 14 shows an outline of a conventional double-facer paper pressing device in a corrugated machine, and FIG. 15 shows an outline of another conventional double-facer paper pressing device.

As shown in FIG. 14, in the conventional double facer, 101 is a glueing machine, which is glued to a single-faced corrugated cardboard sheet S formed by sticking a core paper C to a liner L ₁ by a single facer (not shown). And a guide roll 103 for guiding the liner L ₂ attached to the single-sided corrugated board sheet S. The double facer is composed of a heating part HP and a cooling part CP. A preheating roll 104 for heating the liner L ₂ is attached to the heating part HP, and a heating box 105 is provided adjacent to the downstream side of the preheating roll 104 in the transport direction. The cooling part CP is provided with a conveyor belt 106 adjacent to the downstream side of the heating box 105 in the conveying direction and circulated and driven. Further, a pressure belt 107 that is driven to circulate over the heating part HP and the cooling part CP is provided, and a plurality of pressure rollers are provided in the cooling part CP.
108 is provided. And heating part H
In P, a pressure unit 109 that faces the heating box 105 and presses the pressure belt 107 on the upper surface of the heating box 105 is provided. In the pressure unit 109, an air chamber 110 that opens downward on the upper surface of the pressure belt 107.
A blower 112 for supplying compressed air is connected to the air chamber 110 via an air supply pipe 111.

Therefore, the single-faced corrugated sheet S in which the core paper C is attached to the liner L ₁ by the single facer is processed by the glue roll 102 of the glueing machine.
While the liner L ₂ is attached to the guide roll 10
It is guided by 3, preheated and preheated by the preheat roll 104, and is appropriately heated by steam. Then, the single-sided corrugated board sheet S and the liner L ₂ are carried in between the heating box 105 and the pressure belt 107 in a laminated state. The single-faced corrugated sheet S and the liner L ₂ laminated here are the heating box 10
A suitable heating force is applied from 5 and a suitable pressure is applied by the pressure belt 107 to which a pressing force is applied by the compressed air in the air chamber 110, and the both are bonded to form the double-faced corrugated cardboard sheet D. After that, the double-faced corrugated cardboard sheet D is attached to the pressure belt 107, the pressure roller 108 and the conveyance belt.
It is carried into the space between 106 and 106 and cooled here to secure the adhered state, and the deformation such as distortion and warp is corrected.

[0005] By the way, there are many kinds of corrugated cardboard sheets having different widths, and liners L ₁ and L as raw materials are used.
There are various sizes of ₂ and core paper C, etc. in order to have a standard width that can be shaped in consideration of their economic efficiency. In the heating part HP, the double facer described above is carried in with the single-faced corrugated sheet S and the liner L ₂ laminated between the heating box 105 and the pressure belt 107,
The double-faced corrugated board sheet D is formed by appropriately attaching both by applying appropriate heating and appropriate pressure. Therefore, the pressure belt 107 is the heating box 1
It is necessary to apply a uniform pressing force to the single-sided corrugated board sheet S and the liner L ₂ on the 05 in the width direction.

However, in the above-mentioned conventional double-facer paper pressing device, the pressing belt 107 is pressed downward by the compressed air in the air chamber 110 to press the single-sided corrugated cardboard sheet S and the liner L ₂ . Belt 10
A pressure of 7 was applied. Therefore, when the pressure belt 107 and the heating box 105 are loaded with the single-faced corrugated sheet S and the liner L ₂ having a width narrower than the width of the pressure belt 107, the pressure belt 107 is heated by the heating belt 107. A single-sided corrugated board sheet S and a liner L _{2 are} placed on the lining box 105.
In the position where no pressure exists, the side portion of the pressure belt 107 hangs down due to the compressed air in the air chamber 110.
Then, the pressing force of the pressure belt 107 becomes higher in both side portions of the single-faced corrugated cardboard sheet S and the liner L ₂ than in the center portion in the width direction, and there is a problem of crushing. Further, when the side portion of the pressure belt 107 hangs down, a gap is created between the air chamber 110 and the pressure belt 107 to cause air leakage, and an appropriate pressure is applied to the single-sided corrugated cardboard sheet S and the liner L ₂ . It becomes impossible to add.

Therefore, as a solution to such a problem, the applicant of the present invention has filed a “double facer heating part” as Japanese Patent Application No. 6-33539. As shown in FIG. 15, the heating box 201 is divided into a plurality of parts, and a pressure belt 202 is rotatably disposed on the upper surface of each heating box 201.
A pressure chamber 205 composed of an air chamber 203 and a plurality of shaped steels 204 is provided on the upper surface of the pressure belt 202 so as to face the heating box 201, and compressed air is supplied to each pressure chamber 205 via a supply pipe 206. The blower 207 to be supplied is connected.

Therefore, the single-sided corrugated sheet S is liner L
₂ is carried in between the heating box 201 and the pressure belt 202 in a laminated state, and the one-sided corrugated sheet S and the liner L ₂ laminated here are appropriately heated by the heating box 201, and A moderate pressure is applied by the pressure belt 202 to which a pressing force is applied from the air chamber 110 and the shaped steel 204, and the both are bonded to form the double-faced corrugated cardboard sheet D. That is, compressed air is supplied to the pressurizing chamber 205 from the blower 207 via the supply pipe 206, and the compressed air is supplied to the air chamber 110 to the shaped steel 2 by the compressed air.
04 is urged downward to apply a pressing force to the pressure belt 202. Therefore, the pressure belt 202 is not deformed and the single-sided corrugated sheet S and the liner L ₂ on the heating box 201 are not deformed.
Is applied to apply an appropriate pressing force, and the single-sided corrugated board sheet S and the liner L ₂ can receive a uniform pressing force in the width direction.

[0009]

By the way, in the above-mentioned conventional double facer heating part, each heating box 201 has a lateral width dimension and a traveling speed of the single-faced corrugated sheet S and liner L ₂ to be conveyed, and a liner L.
₂ causes various expansion and contraction deformations depending on the preheating temperature of ₂ , the surface temperature of the heating box 201 itself, and the like. On the other hand, the shaped steel 204 which applies a pressing force to the pressure belt 202 has a predetermined rigidity so as not to be deformed by compressed air. Therefore, when the shaped steel 204 having a predetermined rigidity exerts a pressing force on the pressure belt 202, with respect to the heating box 201 that has undergone expansion deformation or contraction deformation,
It is not possible to apply an appropriate pressing force to the single-sided corrugated board sheet S and the liner L ₂ carried in between the heating box 201 and the pressure belt 202.

That is, as shown in FIG. 16A, when the heating box 201 contracts and its surface is deformed into a concave shape, the pressure applied by the pressure belt 202 is the same as that of the heating box 201 and the pressure belt 202. Both side portions in the width direction become higher than the single-faced corrugated board sheet S and the liner L ₂ that have been carried in between. In addition, as shown in FIG. 16B, when the heating box 201 expands and its surface is deformed into a convex shape,
The pressure applied by the pressure belt 202 is the heating box 201.
The central portion in the width direction is higher than the one-sided corrugated board sheet S and the liner L ₂ carried in between the pressure belt 202 and the pressure belt.
When the pressure applied by the pressure belt 202 to the single-faced cardboard sheet S and the liner L ₂ on the heating box 201 is locally increased as described above, the single-faced cardboard is crushed by the portion, while the single-faced cardboard is applied to the low-pressure portion. There is a problem that the sheet S and the liner L ₂ cannot be properly attached to each other.

The present invention solves such a problem. Even if the surface of the heating box is deformed, the single-faced corrugated cardboard sheet and the liner can be reliably adhered to each other and local crushing can be prevented. It is an object of the present invention to provide a paper holding device for a double facer that prevents the above and improves the quality of the corrugated board sheet.

[0012]

A paper pressing device for a double facer according to the present invention for achieving the above object is provided between a heating box and a heating box provided so as to face the heating box. With a pressure belt that holds and conveys the single-faced cardboard sheet and the liner, and along the width direction of the single-faced cardboard sheet in sliding contact with the upper surface of the pressure belt to attach the single-faced cardboard sheet and the liner. A plurality of plate-shaped bodies arranged in parallel along the traveling direction of the single-sided corrugated board, and a pressing means for applying a fluid pressure to the plurality of plate-shaped bodies to generate a pressing force on the pressure belt are provided. In a paper holding device for a double facer, the plurality of plate-shaped bodies are formed by a plurality of types of plate-shaped bodies having different bending rigidity in the width direction of the single-sided corrugated board sheet, By applying fluid pressure to the several types of plate-like bodies by the pressing means to generate different bending deformations, the pressing distribution in the width direction with respect to the one-sided corrugated cardboard sheet via the pressing belt can be obtained. The feature is that the deformation is averaged.

Therefore, the single-sided corrugated cardboard sheet and the liner are carried in between the heating box and the pressure belt and conveyed in a sandwiched state, and the fluid pressure is applied to the plurality of plate-like bodies by the pressing means to press them. By generating a pressing force on the belt, the single-sided corrugated cardboard sheet and the liner are bonded together. At this time, different types of plate-shaped bodies with different bending rigidity undergo different bending deformation depending on the fluid pressure of the pressing means. Thus, the pressure belt has the same shape as that of the heating box that expands or contracts, and the widthwise pressing distribution of the pressure belt on the single-sided corrugated cardboard sheet is averaged with respect to the top-bottom deformation of the heating box. , The single-sided cardboard sheet and the liner are firmly attached.

Further, in the double-facer paper pressing device of the present invention, the plurality of plate-shaped members are composed of two or more kinds of plate-shaped members having different rigidity.

Therefore, the pressure belt has the same shape with respect to the heating box that is expanded or contracted by being pressed by two or more kinds of plate-shaped members having different rigidity.

Further, in the paper pressing device for a double facer of the present invention, the plate-shaped body is formed so that different rigidity ratios gradually differ from the upstream side to the downstream side of the single-sided corrugated board sheet and the liner in the conveying direction. It is characterized by being arranged.

Therefore, by deforming the plurality of plate-shaped bodies in accordance with the heating box that expands or contracts, the single-sided corrugated board sheet and the liner can be reliably attached.

Further, in the double-facer paper pressing device of the present invention, the lower surface of the plate-like body is formed in a crown shape.

Therefore, by forming the lower surface of the plate-shaped member into a crown shape, the plate-shaped member can be easily deformed with respect to the heating box that contracts and deforms.

Further, in the double-facer paper pressing device of the present invention, the plate-like body is formed of shaped steel.

Therefore, by constructing the plate-shaped body of shaped steel, it is possible to manufacture a high-quality corrugated board sheet at low cost.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic side view of a double-facer paper pressing device according to an embodiment of the present invention, FIG. 2 is a schematic plan view of the double-facer paper pressing device, and FIG. 3 is a pressing unit of the paper pressing device. A cross section of a main part, a cross section of a main part showing a connection structure of an air chamber and a shaped steel in FIG.
FIG. 6 shows an explanation of the pressure applied by the shaped steel when the heating box is deformed.

In the double facer paper pressing device of the present embodiment, as shown in FIGS. 1 and 2, the double facer is composed of a heating part and a cooling part, and the heating box 11 is provided in the heating part HP. A plurality of them are arranged so as to be warped in the transport direction. On the other hand, an endless pressure belt 12 is disposed above the heating box 11 so as to be circulatively driven by a large number of guide rollers 13.
Is in sliding contact with the upper surface of the heating box 11. Further, above each heating box 11, a pressure unit 14 for pressing the pressure belt 12 against the upper surface of the heating box 11 is provided. The pressurizing unit 14 is composed of a box-shaped air chamber 15 located above the pressurizing belt 12 and having a lower opening, and a plurality of shaped steels 16 closing the lower opening of the air chamber 15.
A blower 19 for supplying compressed air is connected via a supply pipe 18 to the pressurizing chamber 17 formed by the air chamber 15 and the plurality of shaped steels 16.

As shown in FIGS. 3 to 5, the shaped steel 16 includes a flat surface portion 16a along the pressure belt 12, front and rear walls 16b and 16c formed in front of and behind the flat surface portion 16a, and the flat surface portion 16a.
And side walls 16d formed on both sides of each of the side walls, and each side wall 16d is formed with an elongated hole 16e extending vertically. The plurality of shaped steels 16 are located in the lower portion of the air chamber 15, and the connecting pin 20 protruding outward from the side portion of the air chamber 15 engages with the elongated hole 16e, so that The shaped steel 16 is allowed to move up and down and is regulated to move back and forth. In addition, adjacent shaped steel 1
The front and rear walls 16b and 16c are connected to each other by a rubber cap 21 to seal the gap between them, and further, a rubber sheet 22 is attached between the air chamber 15 and each shaped steel 16 so that the gap between the two is eliminated. Is sealed.

In the present embodiment, the bending rigidity in the lateral width direction of the single-faced corrugated sheet S and the liner L _{2 in} the plurality of shaped steels 16 constituting the pressing portion 14 is made different. That is, the plurality of shaped steels 16 are configured by a plurality of types of shaped steels. Therefore, compressed air is supplied from the blower 19 into the air chamber 15 through the supply pipe 18,
When the inside of the pressurizing chamber 17 is pressurized, each shape steel 16 of a different type
The amount of deformation differs depending on the pressure.

The operation of the double facer paper pressing device of this embodiment will now be described.

As shown in FIG. 1, a core paper C is attached to a liner L ₁ by a single facer (not shown) to form a single-sided corrugated board sheet S. The single-sided corrugated board sheet S is glued on the surface to form a liner L. _The heating part HP is sent in the state of being stacked with ₂ . here,
The laminated single-sided corrugated sheet S and liner L ₂ are carried in between the heating box 11 and the pressure belt 12, where the single-sided corrugated sheet S and liner L ₂ are appropriately heated by the heating box 11. Moreover, the pressure belt 12 to which a pressing force is applied from the pressure unit 14 receives an appropriate pressure, and the both are bonded to form the double-faced corrugated cardboard sheet D. That is, compressed air is supplied from the blower 19 through the supply pipe 18 to the pressurizing chamber 17 formed by the air chamber 15 and the plurality of shaped steels 16, and the compressed air causes each of the air chambers 15 to move. The shaped steel 16 is urged downward to apply a pressing force to the pressure belt 12. Accordingly, the pressure belt 12 uniformly presses the single-faced cardboard sheet S and the liner L ₂ on the heating box 11 in the width direction without hanging down the side portions, and applies an appropriate pressing force. The S and the liner L ₂ are pressed and attached.

At this time, the heating box 11 undergoes various expansion and contraction deformations depending on the lateral width and traveling speed of the single-faced corrugated sheet S and the liner L ₂ , the preheating temperature, the surface temperature of the heating box 11 itself, and the like. is there. That is, the heating box 11 is appropriately heated by the steam in the initial state and uniformly expands,
Although the surface is deformed like a drum, heat is abruptly absorbed and contracted at the entrance portion where the laminated single-faced corrugated sheet S and the liner L ₂ are carried in, and the surface tends to be deformed into a concave shape. Then, at the exit portion of the heating box 11, the degree to which the single-faced corrugated sheet S and the liner L ₂ that are passed through are cooled to a lesser extent and the amount of shrinkage is reduced, so that the heating box 11 is returned to the initial state. The surface is deformed into a convex shape by expanding like a drum so as to maintain a close shape.

On the other hand, in the present embodiment, the pressure unit 14
The bending rigidity of the plurality of shaped steels 16 constituting the above is different, and even if the heating box 11 is expanded or contracted under the various conditions described above, each shaped steel 16 is By deforming according to the surface shape, the shaped steel 16 can uniformly press the single-faced corrugated sheet S and the liner L ₂ on the heating box 11 through the pressing belt 12 in the width direction.

That is, as shown in FIG. 6 (a), the surface of the heating box 11 into which the laminated single-faced corrugated sheet S and the liner L ₂ are carried in is deformed into a concave shape, but the bending rigidity is low. The shaped steel 16 has a central portion projecting and deforming downward in accordance with the surface shape of the heating box 11, so that the single-faced corrugated sheet S is pressed through the pressure belt 12.
And the liner L ₂ is pressed uniformly in the width direction. In addition, FIG.
As shown in (b), the surface of the heating box 11 is deformed in a convex shape at the exit portion, but the shaped steel 16 having a low bending rigidity has a central portion that is upward in accordance with the surface shape of the heating box 11. By deforming the depression, the pressure belt 12
The single-sided corrugated board sheet S and the liner L ₂ are uniformly pressed in the width direction via.

As described above, in the paper pressing device according to the present embodiment, the bending rigidity of the plurality of shaped steels 16 is made different from each other, so that the shaped steels are protected against expansion deformation or contraction deformation of the heating box 11. By deforming 16 according to its surface shape, the pressure belt 12 can uniformly press the single-faced cardboard sheet S and the liner L ₂ on the heating box 11 in the width direction, and has high strength and good flatness. A high-quality double-sided corrugated board sheet D can be manufactured.

Further, even if the plurality of shaped steels 16 are deformed, the compressed air does not always come into close contact with the air chamber 15 and the compressed air does not leak. By maintaining the air pressure in the pressurizing chamber 17 at a predetermined pressure,
A high-quality double-sided corrugated board sheet D can be manufactured in a short time, and productivity can be improved.

The plurality of shaped steels 16 are not limited to the above-described structure, and press-formed products of I-shaped steel or thin steel, molded products of synthetic resin, etc. may be used in addition to the grooved steels. Good. Further, in the air chamber 15 and the shaped steel 16 which configure the pressurizing portion 14, adjacent shaped steels 16 are connected by the rubber cap 21, and the air chamber 15 and each shaped steel 16 are connected.
Although a rubber sheet 22 is attached between and to prevent the compressed air from leaking in the pressurizing chamber 17, synthetic resin or a brush may be used.

By the way, in the double-facer paper pressing device of this embodiment, as described above, the bending rigidity of the plurality of shaped steels 16 forming the pressurizing portion 14 is made different so that the heating box 11 is heated. Each shaped steel 16 is deformed according to the surface shape due to the expansion deformation or the contraction deformation, and the specific configuration thereof will be described below.

FIG. 7 shows a pressing force distribution in the width direction representing the pressing force of a shaped steel having a high bending rigidity against the expanded and deformed heating box, and FIG. 8 shows a pressing force of a shaped steel having a low bending rigidity to the expanded and deformed heating box. 9 shows the pressing force distribution in the width direction, FIG. 9 shows the bending rigidity with respect to the contracted and deformed heating box having a high bending rigidity, and FIG. 10 shows the pressing force distribution in the width direction with respect to the contracted and deformed heating box. A pressing force distribution in the width direction showing a pressing force of a low shaped steel, a schematic showing an example of arranging a plurality of shaped steels in a heating box in Fig. 11, and a rigidity of a plurality of shaped steels arranged in a heating box in Fig. 12. FIG. 13 is a schematic view showing a ratio, and FIG. 13 is a schematic view showing another arrangement example of a plurality of shaped steels for a heating box.

7 and 8 show the case where the heating box 11 is appropriately heated and uniformly expanded, so that the surface is deformed into a drum shape. Since the shaped steel 16 having high rigidity hardly deforms, it is considered that the lower surface is a flat surface. As shown in FIG. 7A, when the shaped steel 16 is pressed by air pressure, the surface of the heating box 11 becomes a flat surface. At some time, the pressing force distribution of the sheet D by the shaped steel 16 whose lower surface is a flat surface becomes uniform in the width direction, but as shown in FIG. 7B, when the surface of the heating box 11 is a convex surface, The pressing force distribution of the sheet D by the shaped steel 16 having a flat lower surface is higher in the central portion. On the other hand, since the shaped steel 16 having low rigidity is easily deformed, when the shaped steel 16 is pressed by air pressure as shown in FIG. 8A, when the surface of the heating box 11 is flat, Since the widthwise end of the sheet deforms downward, the pressing force distribution of the sheet D by the shaped steel 16 becomes higher at the widthwise end, but FIG.
As shown in (b), when the surface of the heating box 11 is a convex surface, the widthwise end of the shaped steel 16 follows the convex surface of the heating box 11, and the pressing force of the shaped steel 16 against the sheet D is applied. The distribution becomes uniform in the width direction.

9 and 10 show the case where the heating box 11 is cooled and uniformly contracts, so that the surface is concavely deformed. The shaped steel 16 having low rigidity has a crown shape in which the central portion of the lower surface is swollen. Since the shaped steel 16 having high rigidity hardly deforms, it is considered that the lower surface is a flat surface. As shown in FIG.
Is pressed by air pressure, when the surface of the heating box 11 is a flat surface, the pressing force distribution of the sheet D by the shaped steel 16 whose lower surface is a flat surface becomes uniform in the width direction. Heating box 1 as shown in
Shaped steel 16 whose lower surface is a flat surface when the surface of 1 is a concave surface 16
The pressing force distribution of the sheet D due to becomes higher at the widthwise end.
On the other hand, since the shaped steel 16 having low rigidity is easily deformed, the shape shown in FIG.
As shown in (a), when the shaped steel 16 is pressed by air pressure, when the surface of the heating box 11 is a flat surface, the widthwise end portion of the shaped steel 16 is deformed so as to hang downward. Because of the shape, they are offset and follow the convex surface of the heating box 11, and the pressing force distribution of the sheet D by the shaped steel 16 becomes uniform in the width direction.
As shown in 0 (b), when the surface of the heating box 11 is concave, the pressing force distribution of the sheet D by the shaped steel 16 becomes higher at the widthwise end.

From the above, the shaped steel 16 having a shape and rigidity suitable for the deformed shape of the heating box 11 may be provided. That is, as shown in FIG.
The heating box 11 is composed of five heating boxes 11a to 11e, and two shaped steels 16 are arranged for one heating box. In this case, as described above, the heating box 11 has a tendency that the surface of the heating box 11 is deformed into a concave shape at the entrance portion and the surface of the heating box 11 near the initial state is deformed into a convex shape at the exit portion. Therefore, heating box 11
It is assumed that a to 11e are gradually deformed into a convex surface along the conveyance direction of the sheet D, and each heating box 11a
Up to 11e, two shaped steels 16A, 16 having different rigidity
B is installed. Then each heating box 1
With respect to the pressing force distributions 1a to 11e, the pressing force distribution having a high central portion and the pressing force distribution having a high end portion are alternately repeated according to the principle described above. Therefore, the sheet D which has passed such a pressing force distribution can obtain a generally uniform pressing force in the width direction.

If the heating boxes 11a-11
When a shaped steel 16 having the same rigidity is arranged in e, only a pressing force distribution with a high central portion acts on the shaped steel 16A having a high rigidity, and only a pressing force distribution with a high end acts on the sheet D for a shaped steel 16B having a low rigidity. Therefore, the flatness of the sheet D is not good.

Further, in this case, considering the rigidity ratio of the shaped steels 16A and 16B, it is determined by the following formula.

The heating box 11 has a tendency that the surface of the heating box 11 is deformed into a concave shape at the entrance portion and the surface close to the initial state is convex at the exit portion. Therefore,
As shown in FIG. 12, the shaped steel 16 may be arranged so that the rigidity ratio becomes higher toward the inlet portion of the heating box 11, and the rigidity ratio of the shaped steel 16 may be zero at the outlet portion. Therefore, the rigidity ratio may be set so as to become lower toward the downstream side of the sheet D in the conveyance direction, but may be set stepwise if the width of the deformation degree of the heating box 11 is small.

Further, although two shaped steels 16 are arranged for one heating box 11, the number thereof is not limited. That is, as shown in FIG. 13A, three shaped steels 16A, 16B and 16C having different rigidity are arranged for one heating box 11,
As shown in (b), three shaped steels 16A and 16C having different rigidity may be provided for one heating box 11.

[0044]

As described above in detail in the embodiments, according to the double-facer paper pressing device of the present invention, the single-faced corrugated cardboard sheet and the liner are slidably contacted with each other in order to bond them to each other. A plurality of plate-shaped bodies that are arranged side by side along the width direction and along the traveling direction of the single-sided corrugated board sheet are configured by a plurality of types of plate-shaped bodies that have different bending rigidity in the width direction of the single-sided corrugated board sheet. By applying fluid pressure to the body by the fluid pressure to generate different bending deformations, the pressing distribution in the width direction for the single-sided corrugated cardboard sheet is averaged with respect to the undulating deformation of the top surface of the heating box. Therefore, even if the surface of the heating box expands or contracts, a large number of plate-like objects can be changed in the same manner with respect to the deformed heating box. By be along by, it is possible to reliably it is possible to bond the single-faced corrugated fiberboard sheet and liner in a proper state, improve the quality of the cardboard sheet to prevent local crushing.

Further, according to the paper pressing device of the double facer of the present invention, since the plurality of plate-like members are composed of two or more kinds of plate-like members having different rigidity, the pressure belt is different in two or more kinds. The same shape can be applied to the heating box that is expanded or contracted and deformed by being pressed by the plate member having rigidity.

Further, according to the paper pressing device of the double facer of the present invention, the plate-like body is formed so that the different rigidity ratios of the single-faced corrugated sheet and the liner from the upstream side to the downstream side gradually or gradually decrease. Since the plurality of plate-shaped bodies are deformed in accordance with the heating box that expands or contracts, the single-sided corrugated board sheet and the liner can be reliably attached.

Further, according to the double facer paper pressing device of the present invention, since the lower surface of the plate-like member is formed in the crown shape, the plate-like member can be easily deformed with respect to the shrinking and deforming heating box. .

Further, according to the double facer paper pressing device of the present invention, since the plate member is made of shaped steel, it is possible to manufacture a high-quality cardboard sheet at low cost.

[Brief description of drawings]

FIG. 1 is a schematic side view of a paper pressing device for a double facer according to an embodiment of the present invention.

FIG. 2 is a schematic plan view of a paper pressing device for a double facer.

FIG. 3 is a cross-sectional view of essential parts showing a pressing unit of the paper pressing device.

FIG. 4 is a cross-sectional view of essential parts showing a connection structure between an air chamber and a shaped steel.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is an explanatory view showing a pressed state by the shaped steel when the heating box is deformed.

FIG. 7 is a pressing force distribution diagram in the width direction showing the pressing force of the shaped steel having high bending rigidity against the expanded and deformed heating box.

FIG. 8 is a widthwise pressing force distribution diagram showing the pressing force of a shaped steel having a low bending rigidity against the expanded and deformed heating box.

FIG. 9 is a widthwise pressing force distribution diagram showing a pressing force of a shaped steel having high bending rigidity with respect to a heating box that has been contracted and deformed.

FIG. 10 is a widthwise pressing force distribution chart showing the pressing force of a shaped steel having a low bending rigidity with respect to a contracted and deformed heating box.

FIG. 11 is a schematic view showing an arrangement example of a plurality of shaped steels with respect to a heating box.

FIG. 12 is a schematic diagram showing a rigidity ratio of a plurality of shaped steels arranged in a heating box.

FIG. 13 is a schematic view showing another arrangement example of a plurality of shaped steels with respect to a heating box.

FIG. 14 is a schematic view of a conventional paper pressing device for a double facer in a corrugating machine.

FIG. 15 is a schematic view of another conventional paper pressing device for a double facer.

FIG. 16 is an explanatory diagram showing a pressed state by the shaped steel when the heating box is deformed by the paper pressing device of the conventional double facer.

[Explanation of symbols]

11 Heating Box 12 Pressure Belt 14 Pressure Unit (Pressure Means) 15 Air Chamber 16 Shape Steel (Plate Body) 17 Pressure Chamber 19 Blowers L ₁ and L ₂ Liner C Core Paper S Single-sided Cardboard Sheet D Double-sided Cardboard Seat HP heating part

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B31F 1/36

Claims (5)

(57) [Claims] 1. A heating box, a pressure belt which is provided so as to face the heating box and which holds and conveys a single-faced cardboard sheet and a liner between the heating box and the single-faced cardboard sheet. A plurality of plate-like bodies arranged in parallel along the width direction of the one-sided corrugated board sheet in sliding contact with the upper surface of the pressure belt to attach the liner, and the plurality of plate-shaped bodies. In a paper pressing device of a double facer, which comprises a pressing means for applying a fluid pressure to the plate-like member to generate a pressing force on the pressure belt, the plurality of plate-like members in the width direction of the single-faced corrugated cardboard sheet. It is configured by a plurality of types of plate-shaped bodies having different bending rigidity, and fluid pressure is applied to the plurality of types of plate-shaped bodies by the pressing means to generate different bending deformations. Thereby, the pressing distribution in the width direction with respect to the one-sided corrugated board sheet via the pressure belt,
A double facer paper pressing device, wherein the heating box is averaged with respect to undulation deformation of the upper surface. 2. The double-facer paper pressing device according to claim 1, wherein the plurality of plate-shaped members are composed of two or more plate-shaped members having different rigidity. . 3. The paper pressing device for a double facer according to claim 1, wherein the different rigidity ratios from the upstream side to the downstream side of the one-sided corrugated cardboard sheet and the liner in the conveying direction gradually or gradually decrease. A double facer paper pressing device having a body. 4. The double-facer paper pressing device according to claim 1, wherein the plate-shaped body has a lower surface formed in a crown shape. 5. The paper pressing device for a double facer according to claim 1, wherein the plate-shaped body is made of shaped steel.