KR19980069691A - Web humidifier and corrugated web manufacturing line - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

It relates to a web humidifying apparatus for applying water to the corrugated web and the production line of the corrugated web including the humidifier.

2. Technical problem to be solved by the invention

It is to prevent the deformation or bending of the corrugated web in the corrugated sheet manufacturing apparatus of the conventional configuration.

3. Summary of Solution to Invention

The web humidifier 1 includes elastic rolls 20a and 20b and metal rolls 27a and 27b, each elastic roll 20a and 20b connected at least on one side with a corresponding double-sided web in continuous feeding. It is rotatable in a feeding direction and at least the surface layer of the elastic roll is made of an elastic material such as rubber or natural or synthetic rubber. Each of the metal rolls 27a and 27b is rotated in a direction opposite to the elastic rolls 20a and 20b while being pressed by the corresponding elastic rolls 20a and 20b, and the surface roughness of the metal rolls 27a and 27b is 50 µm. It is larger than Ra. Water buried in the metal rolls 27a and 27b is transferred to the elastic rolls 20a and 20b and is fed to the web by the elastic rolls 20a and 20b according to the rotation thereof.

4. Important uses of the invention

It is an object of the present invention to provide a web humidifying apparatus for precisely and quickly controlling the amount of water applied to a corrugated sheet and a line for producing a corrugated web including the web humidifying apparatus.

Description

Web humidifier and corrugated web manufacturing line

The present invention relates to a web humidifier for applying water to a corrugated web and to a line for producing a corrugated web including the humidifier in order to prevent the corrugated web from being deformed or warped.

In the manufacture of double-sided corrugated webs, the upper liner (or lower liner) is bonded to the corrugated intermediate to form a single-sided web, and the lower liner (or upper liner) is laminated to the single-sided web to form a double-sided web. do. The manufactured double-sided web is dried to dry the adhesive in the drying apparatus, cut as a design dimension of the corrugated material and piled for storage.

When the moisture content is different between the upper liner and the lower liner, especially when the difference in water content is large, each loaded corrugated material may cause warpage due to the continuous change of the moisture content. Paper liners expand or contract when absorbed or taken away by water, and the amount of shrinkage changes is sensitive to atmospheric humidity. The large difference in moisture content between the upper and lower liners causes the corrugated sheet to bend due to the large difference in shrinkage.

In order to solve this problem, a web humidifier is used below as proposed in Japanese Laid-Open Publication No. 34081/96.

The apparatus includes an application roll of metal material disposed adjacent to the line downstream drying apparatus and rotating in contact to feed the double-sided web, and a drain roll of rubber material which rotates in vertical contact with the application roll. Water is fed to the valley-shaped space formed between the application roll and the upper part of the drain roll, and is fed to the double-sided web by the metal application roll, and the drain roll controls the amount of water fed to the web by adjusting the thickness of the water layer on the application roll. Adjust

In recent production lines for producing corrugated materials, many kinds of webs are continuously manufactured by butt bonding according to various orders.

When the web material or web thickness is changed without stopping the continuous process, the amount of water applied must be changed very quickly and precisely to prevent the web from bending during storage. In the configuration of the humidifying apparatus of the conventional configuration, the amount of water to be applied must be adjusted according to the change in the interaxial distance between the roll of metal and the roll of rubber.

However, a small change in the roll spacing of the rolls causes the amount of water released from the valley space between the rules to be extremely changed, i.e., by causing or not causing a sudden release of all water due to the low viscosity of the material. This adjustment is very difficult. In addition, such a problem can be avoided, but the above-mentioned adjustment takes a lot of time and requires a high level of skill and experience, so that the conventional humidification device cannot be applied to a line for manufacturing various kinds of small amounts of webs.

An object of the present invention relates to a web humidifying apparatus for precisely and quickly controlling the amount of water applied to a corrugated sheet and a line for producing a corrugated web including the web humidifying apparatus.

In order to achieve the above object, the web humidifier of the present invention comprises an elastic roll and a metal roll. The elastic roll is positioned to correspond to at least one side of the double-sided web so as to continuously feed, and is rotatable in the feeding direction or the opposite direction of the web, at least the surface layer is configured as an elastic material such as rubber or elastomer (synthetic, natural rubber, etc.) do.

The metal roll is pressed against the elastic roll and rotates in the opposite direction to the elastic roll, and the surface roughness of the roll surface is adjusted to 50 µm Ra or more. Surface roughness in this specification is average roughness in the center line Ra to B0601 of the Japanese Industrial Standard (JIS).

In the conventional web humidifier, the metal roll has a smooth surface, and water is easily discharged from the roll surface due to the weak frictional force between the water and the roll surface, so that an amount of water is not sufficient for web humidification.

The inventors of the present invention can find that an appropriate amount of water can be accommodated in a large number of cavities formed on the roll surface under the condition that the surface roughness of the metal roll is 50 µm Ra or more, and the amount of water applied to the web (hereinafter referred to as 'amount of water applied') It has been found that this can be adjusted quickly and accurately.

Although the metal rolls and elastic rolls can be used instead of the conventional construction and the application roll and the draining roll, respectively, the present inventors have opposing configurations, that is, a combination using a metal roll instead of the drain roll and an elastic roll instead of the application roll. It has been found useful in applying water to the web uniformly and efficiently and easily controlling the amount of water applied to the web.

In this combination, the elastic roll is disposed so as to be in contact with the double-sided web, and water buried in the metal roll is transferred to the elastic roll which is pressed by the metal roll and rotates. Water is applied to the double-sided web by the elastic roll. The above-described effect is that the surface portion of the elastic roll is composed of an elastic material such as rubber, synthetic or natural rubber, and the layer of water formed on the elastic roll is more uniform than the roll of metal material which rejects water, and the elastic roll when in contact with the web It is believed to be due to the occurrence of light elastic deformation at the surface portion of. If the surface roughness of the metal roll is 50 µm Ra or less, the amount of water buried in the metal roll is insufficient, and it is difficult to control the amount of water applied.

On the other hand, under conditions of surface roughness of 450 µm Ra or more, the friction for confining water in the cavity becomes too weak, so that a sufficient amount of water is hardly buried on the roll surface. Therefore, the surface roughness of the metal material roll is preferably adjusted within the range of 50 µm Ra-450 µm Ra, and more preferably within the range of 100 µm Ra-300 µm Ra.

The humidifier is preferably disposed on the downstream side of the drying apparatus for drying the adhesive for adhering the upper liner and the lower liner to the corrugated intermediate to form the double-sided web, and is a device for adding water to the double-sided web after drying. . In this configuration, since water is applied to the web after drying, no intense steaming of the water occurs during heating for drying, so that the humidity content of the web after the water is further stabilized.

In the humidifying apparatus of the present invention, the amount of water applied to the web is preferably adjusted so that the moisture content of the paper liner of the double-sided web is about 6-9%. If the moisture content of the paper liner is 6-9% under a relative humidity of 60%, the paper liner stabilizes and hardly shrinks. In order to perform the degree of the amount of water applied to such a web, it is preferable that the surface hardness of a metal material roll is 50 micrometers Ra or more.

However, when the amount of water can be adjusted according to consideration of other factors than the surface roughness of the metal roll, the surface roughness may be set to 50 µm Ra or less.

At least the surface layer of the elastic roll can be configured as an absorbent rubber material. In the present specification, the term 'absorbent rubber material' is defined as a rubber material (including synthetic rubber and natural rubber) that absorbs at least 20% by weight of its own weight before absorbing water, and can release at least a part by compression. . However, the rubber material absorbs a considerable amount of water and, when connected with the double-sided web, releases back, so that a sufficient amount of water can be applied uniformly to the web.

The water absorption rate of the absorbent rubber material is preferably 30% or more, and more preferably 40% or more, or 50% or more, 60% or more, 70% or more, 80% or more, 90% or more, 100% or more, 150% It is preferable that they are 200% or more, 250% or more and 300% or more.

An example of such an absorbent rubber material is a synthetic material composed mainly of an absorbent polymer material and a rubber base material having higher water absorption than the rubber base material and interspersed in the rubber base material.

The rubber base material is at least butadiene-acrylonitrile copolymer (or acrylonitrile-butadiene rubber), polychloroprene, polyoprene, natural rubber, polybutadiene, polysobutylene, butadiene-styrene copolymer, isoprene-styrene copolymer , Urethane rubbers such as ethylene-propylene rubber, acrylic elastomer, ethylene-vinyl acetate copolymer, methyl silicone rubber, vinyl methyl silicone rubber, silicone rubber such as phenylmethyl silicone rubber, polyether urethane rubber, polyester urethane rubber, Carboxylated nitrile rubber, isobutylene-isoprene rubber, ethylene-propylene-diene rubber, chlorosulfurated polyethylene, chlorinated polyethylene, epichlorohydrin rubber, epichlorohydrin-ethylene oxide rubber, or widely known rubber It may be synthesized with at least one selected from rubber-like material.

Butadiene-acrylonitrile copolymers, polychloroprene and polyoprene are preferred for use as the rubber base material of the present invention because of their excellent elasticity, durability and operability.

On the other hand, the absorbent polymer material may include starch, cross-linked polyvinyl alcohol, hydrorestate of starch-acrylonitrile copolymer, starch-sodium polyacrylate graft copolymer or saponified thereof, polyacrylic acid copolymer , Carboxymethyl cellulose base copolymer (such as sodium compound of cross-linked carboxymethyl cellulose), cellulose sodium pulliacrylate copolymer, vinylalcoholsodium acrylate-acrylic acid copolymer, crosslinked sodium poly It may be composed of one selected from acrylate, alkaline neutralized of isobutylene-maleic anhydrohydropolymer, crosslinked polyoxyethylene oxide, urethane resin containing crosslinked polyethylene chains.

Particularly preferred absorbent polymer materials (disclosed in JP 47796/79, 83091/79, 83091/71, 83989/79, 87791/79, 108895/69) (hydrophobic polymer segment)-(hydrophilic polymer segment Block copolymer having a bonding style of)-(hydrophobic polymer segment)-(hydrophilic polymer segment)-(hydrophobic polymer segment), urethane having a crosslinked polyoxyethylene chain disclosed in Japanese Patent Application Laid-Open No. 225115/83 It is a water-insoluble substance obtained by drying a resin, a mixture of methylcellulose and acrylonitrile-butadiene rubber latex.

The content of the absorbent polymer material in the absorbent rubber material is preferably adjusted in the range of 10 to 200% by weight of the weight of the entire rubber base material. The content of 10% by weight or less or 200% by weight or more is not preferable in that the water absorption is not sufficient and the mechanical strength of the material is impaired.

Another example of an absorbent rubber material is Japanese Unexamined Patent Publication No. 98850/94, which includes a step of removing water as set from a mixture of an acrylonitrile-butadiene rubber latex and a polyvinyl alcohol hole adsorbent and vulcanizing the mixture. A vulcanized mixture of acryronitrile-butadiene and polyvinyl alcohol obtained by the process disclosed in.

On the surface of the metal material roll whose surface roughness is set as the above-mentioned range, many cavities are formed on the roll surface and water is buried therein. In this case, the amount of water applied can be adjusted by using a roll distance adjusting mechanism for adjusting the interaxial distance between the metal roll and the elastic roll.

The elastic material of the elastic roll penetrates into the cavity formed on the surface of the metal material roll by an amount by adjusting the interaxial distance between the rolls. The amount of water transferred from the metal roll to the elastic roll is controlled by washing the water remaining in the cavity after the infiltration of the elastic roll.

As described above, the amount of water applied to the web can be easily and precisely adjusted according to the adjustment of the interaxial distance between the metal roll and the elastic roll. In this case, it is preferable that the elastic material for elastic rolls selects the Vickers hardness within the range of 10-30 degree.

When the Vickers hardness of the elastic material is 10 degrees or less, wear is caused quickly by friction from the metal roll on the elastic surface. On the other hand, when the Vickers hardness is 30 degrees or more, the elastic material hardly penetrates into the cavity on the metal roll, and it is difficult to control the amount of water added. It is preferable to set the preferred Vickers hardness within the range of 15-25 degrees.

The cavity can be formed as dimples scattered on the surface of the metal roll. In such a configuration, the amount of water accommodated in the cavity, that is, the amount of water applied can be easily adjusted by adjusting the size or depth of each dimple. Such dimples may have a matrix-like arrangement on the surface of the metal roll. The formation density of the dimples is preferably set within 20-50 mesh. 'Mesh' is the number of dimples on one side of the dimple matrix per inch, assuming that the same number of dimples are arranged in the width and length directions in an area of one square inch.

If the dimple formation concentration is less than 20 mesh, the amount of water accommodated in the metal roll becomes insufficient, and it becomes difficult to control the amount of water added. On the other hand, when the concentration exceeds 50 mesh, the frictional force for confining water in the cavity is so small that a sufficient amount of water is difficult to be accommodated on the metal surface.

The dimple formation concentration on the surface of the metal material is preferably about 30-50 mesh. The arrangement of the dimples is not limited to the matrix shape, but may be arranged in a zigzag shape or randomly. In this case, it is preferable that the dimple formation concentration converted as the case of the matrix shape is adjusted in the above-described range.

If the web feed rate is very fast, only a pair of elastic rolls and metal rolls may be insufficient to feed water by a set amount. In such a case, in order to ensure a sufficient amount of water feeding, a plurality of sets of elastic rolls and metal rolls may be disposed along the feeding direction of the double-sided web.

The humidifying device of the present invention may have an air curtain device upstream and / or downstream. In a typical production line of double sided webs, the web cutting device is arranged after the drying device. The web is fed to a heating apparatus that is heated at 100-130 degrees Celsius and a significant amount of water vapor is generated by adding water to the heated web. If too much water vapor diffuses into the web cutting device, the cutting blade is placed in a humid environment and easily rusts. In order to solve this problem, the air curtain device described above is useful for blocking or suppressing water vapor diffused from the double-sided web after adding water.

The web humidifier has a guiding part supporting the double-sided web underneath and continuously feeds the web to a web cutting device positioned downstream of the web. In this case, if the upper surface (guide surface) of the guiding part is formed in planar shape, when water is applied to the lower side of the web, the friction between the web and the guiding surface will increase. If such friction is too large, it may damage the web due to friction from the guiding surface. In order to prevent such a problem, preferably, protrusions of lateral stripes spaced apart on the upper surface of the guiding portion may be formed in the web feeding direction.

The double sided web is supported on the protrusion. With this arrangement, the guiding portion has a line contact area with the web, so that the frictional force between the web and the guiding portion is reduced and thus no damage to the web is caused.

If too much water is applied to the web in the humidifier, excess water drips from the web into the guiding section and flows down. A drain portion may be formed between the protrusions adjacent to the side on the guiding portion in order to drain the dripping water onto such guiding portion. The drain portion may be configured as each drain hole opened in the upper surface of the guiding portion.

The present invention also relates to a web forming apparatus for adhering upper and lower liners to a corrugated intermediate to form a double sided web, and a downstream web forming apparatus for forming a double sided web to dry an adhesive for bonding liners and a corrugated intermediate. It provides a web manufacturing line comprising a drying apparatus arranged on the side, the web humidifier of the present invention described above.

According to the web production line of the present invention, an appropriate amount of water can be applied to the web after drying, thereby effectively preventing or suppressing warping or bending of the double-sided web.

1 is a schematic side view of one embodiment of a web production line of the present invention.

2 is a rear view of one embodiment of a web humidifier used in the manufacturing line of FIG.

3 is a right side view of FIG.

4 is a cross-sectional view of FIG.

5 is a partial cross-sectional view of FIG.

6 is a schematic perspective view showing a board bent upward or downward.

FIG. 7 is a view showing a perspective view and an example of dimple formation of a metal roll used in the web humidifier of FIGS.

FIG. 8 is a side view schematically showing the main part of FIG. 4. FIG.

9 is a view showing the functions of the metal roll and the elastic roll.

10 illustrates various other embodiments of dimples arranged on a roll of metal material.

11 is a view showing some other examples of dimple shapes.

12 is a schematic side view showing an embodiment in which water is applied to a roll of metal.

13 is a schematic side view illustrating an embodiment in which water is applied to only one side of the web.

14 is a schematic side view showing an embodiment of a plurality of sets of rolls of metal and elastic rolls along the web feeding direction.

FIG. 15 is a schematic side view illustrating an embodiment including an air curtain. FIG.

16 is a diagram showing an example of the guiding part.

* Description of the symbols for the main parts of the drawings *

1: web humidifier 20a, 20b: elastic roll

27a, 27b: metal roll 52: web forming apparatus

68: drying device

The invention will be described in detail with reference to the drawings with several embodiments.

1 shows an embodiment of a line for producing a corrugated web including a web humidifying apparatus according to the present invention. At the most upstream side of the web manufacturing line 51 is a web forming apparatus 52.

In the web forming apparatus 52, a feeding roll 53 for feeding an upper paper liner (hereinafter referred to as 'upper liner') is rotatably disposed. The roll of the upper liner 54 is rotatably supported on the upper liner roll stand 55 and the upper liner a is supported by the feeding roll 53.

The first wrinkle forming rolls and the second wrinkle forming rolls 56a and 56b are rotatably arranged directly above the feeding roll 53. These corrugation rolls 56a and 56b are connected to each other on the corrugation roll surface and rotate together in opposite directions. Immediately below the second wrinkle forming roll 56b, an intermediate paper feed roll 57 is rotatably supported by the intermediate paper roll stand 58.

On the other hand, the first guide roll 59 is arranged directly below the second wrinkle forming roll 56b so that the lower portion is immersed in the adhesive in the fan 60a. The intermediate paper (b) is interposed between the first and second wrinkle forming rolls 56a and b, and is interposed between the second wrinkle forming roll 56b and the first guide roll 59. According to the rotation of the wrinkle forming rolls 56a and 56b, the intermediate paper b is continuously wrinkled between the wrinkle forming rolls 56a and 56b, and an adhesive is applied to the back by the first guide roll 59.

The press roll 61 is rotatably arranged on the upper left side of the second wrinkle forming roll 56b. Meanwhile, the guide roll 62 is rotatably arranged on the pressing roll 61 and the second guide roll 63 is rotatably arranged on the right side of the guide roll 62. The bottom of the second glue coating roll 63 is immersed in the adhesive in the pan 60b.

The upper liner a from the feeding roll 53 and the corrugated intermediate sheet from the second wrinkle forming roll 56b (hereinafter referred to as 'wrinkle intermediate material') b are formed by the rotation of the pressure roll 61. It is bonded to each other, and the cross section web (d) is formed accordingly to be continuously hung on the pressure roll (61), the guide roll (62), the second pull coating roll (63), and the second pull coating roll (63). The adhesive is applied to the front surface of the corrugated intermediate paper 57 in accordance with the rotation of the.

The web forming apparatus 52 is rotatably supported by a feed roll 64 for the lower liner paper (hereinafter referred to as 'down liner') c. The lower liner roll 65 is rotatably supported on the lower liner roll stand 66 on the left side of the feed roll 64. In addition, a pair of tension rollers 67a and 67b are rotatably arranged on the right side, left side, and both sides of the feed roll 64. The lower liner c is caught on the feeding roll 64 and the tension rollers 67a and 67b. As the feed roll 64 rotates, the lower liner c is glued onto the front face of the corrugated intermediate material of the single-sided web d before entering the downstream drying apparatus 68 and thus the double-sided corrugated web 74 (double-sided web). Or D) is molded.

The heating part of the drying apparatus 68 has a heating plate 69 inside, and a lower conveyor 70 is arranged on the right side of the heating plate 69. An upper conveyor 71 is disposed above the heating plate 69 and the lower conveyor 70 to form a predetermined gap with the lower conveyor 70. When the upper conveyor 71 rotates cyclically, the double-sided web 74 is fed to the heating plate 69, whereby the adhesive in the double-sided web 74 is dried (or cured) by heat, and the upper conveyor 71 and Cooling between the lower conveyor 70.

On the downstream side of the drying apparatus 68, in one embodiment of the present invention, a humidifier 1 is arranged and a web cutting device 72 composed of a conventional rotary cutter is installed next to the humidifier. The web 74 from the drying apparatus 68 is naturally cooled in the humidifying apparatus 1 by applying water to both sides, and is cut into the corrugated web D of a specified length in the cutting apparatus 72, thereby cutting the cutting apparatus 72. Finally, the stacker is unloaded by a stacker (not shown) located downstream of.

Hereinafter, the configuration of the humidifier will be described in detail. As shown in FIG. 2, the humidifier 1 is equipped with a lower support frame 3a and an upper support frame 3b. The lower support frame 3a includes fixing plates 4a and 4b, and the upper support frame 3b is movable plate 5a mounted to be movable above the fixing plates 4a and 4b so as to be movable up and down, respectively. 5b) (only 5a is shown in FIG. 3).

As shown in FIG. 3, the guide hole 6 is opened upward in each of the fixing plates 4a and 4b to open in the movable direction of the plate. The protrusion 8 is integrally formed in the lower end surface of each of the movable plates 5a and 5b and inserted into the guide hole 6 so as to be slidable together with the compression spring 7. The bolts 9 are inserted through the rear ends of the movable plates a and 5b so that the insertion portions of the bolts 9 are screwed onto the upper surfaces of the fixing plates 4a and 4b. The compression spring 10 is mounted to the bolt 9 and the outer coaxial, so that both ends are interposed between the head 9a of the bolt 9 and the upper rear end face of the movable plates 5a and 5b.

Each of the movable plates 5a and 5b can move upward against the elastic force of the compression spring 10. Further, web support plates 11a and 11b for supporting the double-sided web D are horizontally hung between the movable plates 5a and 5b.

As shown on the left side of FIG. 2, the support frame 12 is fixed on the outer surface of the fixing plate 4a and the operating shaft 13a is rotatably mounted to the bottom wall of the support frame 12a.

The operation wheel 14a is fixed to the base end of the operation shaft 13a and mounted to the end of the operation shaft 13a of the worm gear 16a. Further, the shaft 17a is rotatably mounted between the front portions of the fixing plates 4a and 4b, and the worm gear 15 that connects with the worm gear 16a is fixed to the right end of the shaft 17a. When the operation wheel 14a is rotated, the shaft 17a rotates via the operating shaft 13a, the worm gear 16a, and the worm gear 15a.

As shown in Figs. 2 to 4, an eccentric roll 18a is mounted on both ends of the shaft 17a so that the center α is deviated from the central axis α1 of the shaft 17a. Each eccentric roll 18a is mounted in an opening 19 formed above the fixing plates 4a and 4b, and the outer circumferential surface thereof is the rear eccentric roll 18a between the lower end faces of the movable plates 5a and 5b. ) Rotates as the shaft 17a rotates, the distance from the central axis α1 to the contact position between the eccentric roll 18a and each movable plate 5a, 5b (L1 in FIG. 4) changes. As a result, each of the movable plates 5a and 5b moves upward or downward.

As shown in Figs. 2 to 4, the elastic rolls 20a and 20b are mounted on the bearing 21 (Fig. 3) so as to be rotatable on the stationary plates 4a and 4b and the movable plates 5a and 5b, respectively. Is mounted.

As shown in FIG. 4, the roll surface portions of the elastic rolls 20a and 20b are made of a porous rubber 23 such as a hydrophilic sponge as an elastic material covering the circumferential surface of the core 22 of metal. . The elastic rolls 20a and 20b are connected to the outer peripheral surface together with the upper and lower surfaces of the web D, respectively. The Vickers hardness of the rubber 23 is selected to be about 15-30 degrees. In addition, as shown in FIG. 2, a drive mechanism composed of a motor and a gear (not shown) for rotationally driving the elastic rolls 20a and 20b is connected to the corresponding ends. At left end of (20a, 20b)

As shown in FIGS. 4 and 5, horizontal guide openings 24 are formed in the front portions of the fixed plates 4a and 4b and the movable plates 5a and 5b, respectively, and the movable bearings 25a and 25b are respectively deep. These horizontal guide openings 24 are mounted so as to be movable back and forth along the direction. As shown in FIG. 5, a connection opening 26 is formed on the upper and lower surfaces of the movable bearings 25b and 25a to connect with the upper and lower edges of the horizontal guard opening 24. As shown in FIG. As shown in Figs. 2 to 4, the metal rolls 27a and 27b are rotatably mounted on the movable bearings 25a and 25b, respectively. These metal rolls 27a and 27b are rotatably supported between the stationary plates 4a and 4b and between the movable bearings 25a and 25b, respectively. Each of the metal rolls 27a and 27b is surface-pressured to the corresponding elastic rolls 20a and 20b on the surface thereof, and thus the drive gear 34 (FIG. 2) connected to one end of the metal rolls 27a and 27b. It is driven by rotation.

FIG. 7A shows the appearance of the metal rolls 27a and 27b (hereinafter only referred to as 27a). On the roll surface 27r of the metal roll 27a, many dimples 100 are formed in a cavity shape. Each dimple 100 has a rectangular planar shape, and thus the inner surface thereof has an inverted triangular shape. Many of the dimples 100 are arranged in a matrix and arranged at equal intervals in their respective length and width arrangement directions. As shown in FIG. 7 (b), the dimples 100 are preferably formed in the order of 20-50 meshes, and the term 'mesh' refers to the same number of dimples in an area of 1 square inch in width and length. Assuming the arrangement in the direction, the number N of dimples 100 on one side of the dimple matrix per inch. As shown in FIG. 7C, the lateral length Ld of each dimple 100 is adjusted to about 0.4-0.8 mm and the adjacent dimple 100 spacing Id is adjusted in a range of 0.2-0.5 mm. . By such a combination of the dimples 100, the surface roughness of the roll surface 27r of the metal material roll 27a is within the range of 50-450 mu m (preferably 100-300 mu m).

As shown in FIG. 2 and FIG. 8, the fan 28 (water supply means) which provides water W is installed under the lower elastic roll 20a, and the lower part of the lower elastic roll 20a is provided with water ( Locked in W). When the lower elastic roll 20a and the lower metal roll 27a rotate together in opposite directions, water buried in the outer peripheral rubber 23 of the elastic roll 20a is partially drained by the metal roll 27a. Then, water is applied to the lower liner c of the double-sided web 74 by the elastic roll 20a by a predetermined amount.

On the other hand, as shown in FIG. 2 and FIG. 4, the watertight plates 29 are movable bearings 25a and 25b on both sides of the upper elastic roll 20b and the metal roll 27b by the brackets 30, respectively. It is fixed on the upper end surface of. As shown in FIG. 4, each watertight plate 29 has a pair of different diameter circular arc portions 29a, 29b on its lower end face. These arc portions 29a and 29b are connected to grooves 31a and 31b respectively formed at corresponding ends of the upper elastic roll 20a and the upper metal roll 27a. Water is stored in the valley-like space K formed by the outer circumferential surface portion of the elastic roll 20b, the outer circumferential surface portion of the metal roll 27b, and the watertight plate 29. The water in the space K is prevented from leaking downward by the elastic rolls 20b and the metal material rolls 27b which are mutually pressurized and leaked to the side by the watertight plate 29. When the upper elastic roll 20b and the upper metallic roll 27b rotate together in opposite directions together, the water on the outer peripheral rubber layer 23 of the elastic roll 20b is partially drained by the metallic roll 27b. Then, water is applied to the upper liner a of the double-sided web 74 by the elastic roll 20b.

It can be assumed that water is applied to the web according to the following mechanism shown in FIG. 9 by the cooperative action of the metal roll 27b (or 27a) and the elastic roll 20b (or 20a). In the case of the elastic roll 20b and the metal roll 27b, when the elastic roll 20b is pressed and rotated to the metal roll 27b side, the outer peripheral rubber layer 23 moves to the dimple 100 on the metal roll 27B. Invading and entering, the water contained in the dimple 100 is partially discharged. When the roll surface 27r of the metal roll 27b comes off from the roll surface 27r of the elastic roll 20b in accordance with the rotation of the rolls 20b and 27b, the intrusion of the rubber layer 23 from the dimple 100 Is released. At least a portion of the water remaining in the dimple 100 is transferred to the roll surface 20r of the elastic roll 20b and has a thickness V corresponding to the amount of rubber that has invaded the dimple 100 (water film Layer) (Wp). The water film layer Wp is applied on the web 74 with the rotation of the elastic roll 20b. (FIG. 8) As shown in FIG. 9, the volume of water remaining in the dimple 100, that is, the water film The thickness V of the layer Wp decreases as the amount of penetration of the rubber 23 increases. On the other hand, as shown in FIG. 9C, as the infiltration amount of the rubber 23 decreases, the amount of water remaining in the dimple 100 and the thickness V of the water film layer Wp increase. Thus, the amount of water applied on the web in this way is controlled.

In addition, at least the surface layer of the rubber layer 23 mainly has a rubber base material (e.g. acrylonitrile-butadiene rubber) and has a higher water absorption than the rubber material (e.g., carboxymethyl cellulose base). Since water is mainly absorbed in the rubber layer 23 and uniformly applied on the surface of the web 74 because it is mainly composed of a high absorbent polymer material uniformly dispersed in the same). The water in the rubber layer 23 is partially squeezed by the pressing force from the metal roll 27b to return to the space K. The amount of water contained in the rubber layer 23, ie, the water applied on the web 74, is the elastic roll. It is controlled by changing the pressing force between the 20b and the metal roll 27b.

In the case of the lower elastic roll 20a and the metal roll 27a, as shown in FIG. 8, the water W is buried by the surface of the elastic roll 20a in the fan 28 and the elastic roll 20a. ) Is taken out of the fan 28 by the rotation of the pan and transferred to the dimple 100 on the metal roll 27a by the connection between the metal roll 27a and the elastic rolls 20a and 20b. The amount of water in the dimple 100 is adjusted by the amount of penetration of the rubber layer 23 of the elastic roll 20a into the dimple 100 so that the water is applied to the web 74 in the same process as the upper rolls 20b and 27b.

As shown in Figs. 3 and 5, the support frames 12b and 12c are protruded and fixed on the outside of the fixed plate 4a and the movable plate 5a. The operating shafts 13b and 13c are rotatably supported on the upper wall of the upper barrier paper frame 12a on the bottom wall of the lower barrier paper frame 12b. The operation wheels 14b and 14c are fixed to the base ends of the operation shafts 13b and 13c, respectively, and the dignity gears 16b and 16c are fixed to the end tips of the operation shafts 13b and 13c. In addition, the shafts 17b and 17c are rotatably mounted between the movable plates 5a and 5b and the front portions of the fixed plates 4a and 4b, and both ends of the shafts 17b and 17c have corresponding movable bearings 25a and 25b. (See FIG. 2) On the other hand, the worm gears 15b and 15c which are connected to the worm gears 16b and 16c are respectively fixed to the right end portions of the shafts 17b and 17c. When the operation wheel 14b or 14c is rotated, the shaft 17b or 17c may be the working shaft 13b or 13c, the worm gear 16b, or 16c, the worm gear 15b or It rotates via 15c.

As shown in FIG. 4, the eccentric rolls 18b and 18c are mounted at both ends of the shafts 17b and 17c so that the centers β and γ are from the central axes β1 and γ1 of the shafts 17b and 17c. Each will come off. The outer periphery of the flat core rolls 18b and 18c is connected to both end faces of the movable bearings 25a and 25b, respectively. As shown in FIG. 3, a pair of support rods 32 protrude on the inner end surfaces of the guide openings 24 of the stationary plates 4a and 4b and the movable plates 5a and 5b to move the movable bearings 25a and 25b. It is fixed against. The compression springs 33 are coaxially mounted on the outer side of the support rod 32, respectively, and both end surfaces of each coil spring 33 are formed on the inner end surface of the guide groove 24 and the rear of the movable bearings 25a and 25b. The sections are connected respectively. When the eccentric roll 18b or 18c rotates in accordance with the rotation of the shafts 17b and 17c, the eccentric rolls 18b and 18c and the movable bearings 25a and 25b are moved from the central axes β1 and γ1. The distance L2 or L3 to the contact position changes.

The movable bearing 25a or 25b moves forward and backward, and the interaxial distance between the elastic roll 20a or 20b and the metal roll 27a or 27b and the elastic roll 20a or 20b and the metal member The pressing force between the rolls 27a and 27b also changes.

As shown in FIG. 9B, when the pressing force is increased, the penetration amount of the rubber layer 23 into the dimple 100 decreases and the volume of water trapped in the dimple 100 also decreases. Therefore, the thickness of the water film layer Wp formed on the elastic roll 20b is reduced, resulting in a decrease in the amount of water applied to the web.

On the other hand, when the pressing force decreases, the penetration amount of the rubber layer 23 increases, and the volume of water trapped in the dimple 100 also increases. Therefore, the thickness V of the water film layer wp formed on the elastic roll 20b is increased to increase the amount of water applied to the web.

The functions of the web manufacturing line 51 and the web humidifier 1 are described below. In the web forming apparatus 52 of FIG. 1, the upper liner a, the corrugated intermediate material b, and the lower liner c are bonded to each other to form the double-sided web 74. In the drying apparatus 68, the web 74 is heated for drying by the heating plate 69, cooled between the conveyors 70 and 71 and fed to the web humidifier 1. In the humidifying apparatus, the web is humidified as the hydrolysis means so that the water content in the web 74 is about 6-9% sufficient to stabilize the upper liner a and the lower liner c. Then, the web 74 is cut as a corrugated material by the length set by the web cutting device 72.

In the web humidifier 1, the web 74 from the drying apparatus 68 is interposed between the elastic rolls 20a and 20b. The upper and lower elastic rolls 20a and 20b are connected to the upper liner a and the lower liner c in a rotational connection state, and water is applied as the mechanism described above. The stable connection between the web 74 and the elastic rolls 20a and 20b is maintained even at a high web feed speed.

When the thickness of the web 74 is increased in accordance with the order change, the gap between the upper and lower elastic rolls 20a and 20b is increased through the following procedure. When the operation wheel 14 of Fig. 2 is rotated in the setting direction, the eccentric roll 18a is connected to the lower end surfaces of the movable plates 5a and 5b to rotate on the outer peripheral surface portion and move upward. According to this operation, as shown in FIG. 4, the distance L1 from the central axis α1 to the contact position between the eccentric roll 18a and the respective movable plates 5a and 5b increases and the movable plate ( 5a and 5b move upward along the upper elastic roll 20a against the elastic force from the spring 9 and the gap between the elastic rolls 20a and 20b increases. On the contrary, when the thickness of the web 74 is reduced, the operation wheel 14a is operated in the opposite direction to reduce the clearance between the elastic rolls 20a and 20b.

The amount of water applied to the liners a and c of the web 74 can be increased by the following procedure. When the operation wheels 14b and 14c in FIG. 2 are rotated in the setting direction, the eccentric rolls 18b and 18c in FIG. 4 are connected with the front surfaces of the movable bearings 25a and 25b to rotate. The distance (L2 or L3 in FIG. 3) between the eccentric rolls 18a and 18c and the movable bearings 25a and 25b from the central axes β1 and γ1 is determined by the spring 33 being moved by the movable bearings 25a and 25b. Since the elastic pressure is reduced respectively. Then, the metal rolls 27a and 27b move upwards as the pressing force on the elastic rolls 20a and 20b decreases, so that the amount of water applied is reduced by the mechanism as described in FIG.

On the other hand, in order to reduce the amount of water applied, the operation wheels 14b and 14c are operated in the opposite direction, so that the metal rolls 27a and 27b are rearward in accordance with the increase in the pressing force against the elastic rolls 20a and 20b. Go to. The amount of water applied to the elastic rolls 20a and 20b can be adjusted independently by independent operation of the operation wheels 14b and 14c.

If the amount of water applied is different between the upper and lower elastic rolls 20a and 20b, the bending in the cut web piece will be caused. And the problem can be solved by independently controlling the amount of water applied to the upper liner (a) and the lower liner (b) by adjusting the pressing force between the elastic roll (20a, 20b) and the metal roll (27a, 27b). have.

In the following description, as shown in FIG. 6, the downward bending means a state in which the central portion rises relative to the periphery when the corrugated material D is placed on the bottom of the lower liner b. As shown in FIG. 6 (b), the upward bending means a case where the periphery of the corrugated material D rises as compared with the upper portion.

In order to shape the board bent downward, the operation wheels 14b and 14c are operated so that the amount of water applied to the upper liner a is less than the lower liner c. Then, the content of the upper liner (a) is higher than the lower liner (c) and the shrinkage ratio with respect to the upper liner is larger than the lower liner (c), so that the board becomes flat. On the contrary, in order to shape the board bent upward, the operation wheels 14b and 14c may be adjusted so that the amount of water applied to the upper liner a is less than that of the lower liner c. Then, the humidity content of the upper liner a becomes smaller than that of the lower liner c and the shrinkage rate for the upper liner a becomes smaller than the shrinkage rate for the lower liner c so that the board becomes flat.

In the above-described embodiment, the rack and pinion mechanism may be used instead of the mechanism using the shafts 17b and 17c to move the metal rolls 27a and 27b up and down. In this embodiment, each of the metal rolls 27a and 27b can be moved by the gear mechanism and the stepping motor connected thereto, so that the metal rolls 27a and 27b can be moved more precisely to determine the position.

The dimples 100 on the metal rolls 27a and 27b may be arranged in a zigzag shape as shown in FIG. 10 (a) or in a random pattern as shown in FIG. 10 (b). have. In addition, the shape of each dimple 100 may be selected from various shapes such as truncated pyramid shape in FIG. 11 (a), cone shape in FIG. 11 (b), and hexagonal pyramid shape in FIG. 11 (c). have.

In the case of using a hexagonal pyramid-shaped dimple, the maximum dimension of the planar dimple 100 is formed as about 5 mm. In addition, as shown in FIG. 11D, a plurality of recessed cavity-shaped grooves 110 may be formed as a lattice pattern on the surfaces of the metal rolls 27a and 27b instead of the dimple 100. On the other hand, the surface roughness of the metal rolls 27a and 27b can be adjusted within the range of 50-450 占 퐉 by surface roughening treatment such as sand blasting on the smooth roll surface.

As shown in FIG. 12, water may be applied to the web 74 using metal rolls 27a and 27b. In this case, the metal rolls 27a and 27b are connected to the web 74. Meanwhile, water may be applied only to one surface of the web 74. In this case, the metal rolls 27a and 27b and the elastic rolls 20a and 20b may be omitted from the side to prevent water from being applied, and as shown in FIG. 13, a roll for applying water (upward elastic in the drawing) The pressing force applied from the roll 20b is supported by the backup roll 120 arranged on the opposite side.

When the web feeding speed is very fast, the elastic rolls may be insufficient to add water by a set amount with a pair of quick re-rolls. In such a case, a plurality of sets of elastic rolls 20a and 20b and metal rolls 27a and 27b may be arranged along the passage path of the web 74 as shown in FIG. 14 to ensure sufficient water supply. have.

As shown in FIG. 15, in the humidifying apparatus 1, the air curtain apparatus 121, 122 of the web 74 in order to block or suppress the steam M from the web 74 after the water is applied. It may be arranged at the corresponding upstream and / or downstream end up and / or down.

The web 74 may be generated by the water being heated to 100-130 degrees Celsius in the heating section such that a significant amount of steam M is applied to the heated web 74. If too much such steam M diffuses into the downstream web cutting device 72, the cutting blade 72a is exposed to a humid environment and rusts.

Air curtain devices 121 and 122 generate blown air to their respective web surfaces to inhibit or block the diffusion of steam from web 74. The air curtain devices 121 and 122 are preferably configured to blow air into the web 74 at an angle inclined with respect to the web surface, as shown in FIG. Such an air curtain device may be arranged only on the upstream end side or the downstream end side of the web humidifier 1.

As shown in FIG. 15, the guiding part 125 is provided adjacent to the inlet of the web cutting device 72. As shown in FIG. The guiding part 125 guides the web cutting device 72 which supports the web 74 coming out from the drying apparatus 68 below. In this case, if the top surface (guide surface) of the guiding part 125 is formed in flat form, when water is applied to the lower surface of the web 74, friction between the web 74 and a guide surface will increase. . If such friction is too large, the web is damaged due to the strong frictional force from the guide surface. In order to solve this problem, as shown in FIG. 16 (a), a series of laterally spaced stripe protrusions 126 are formed on the upper surface of the guiding portion 125 along the feeding direction of the web 74. It is preferably formed. Since the web 4 is in line contact with the protrusion 126, the friction force between the web 74 and the guiding portion 125 is reduced, thereby solving the problem of friction force damaging the web.

As shown in FIG. 16B, the protrusion 126 may be a plurality of rods 126a welded or brazed onto the frame 125a.

If too much water is applied to the web 74 in the web humidifier 1, excess water falls from the web 74 to the guiding portion 125. A drain portion may be disposed between the sides adjacent the protrusion 126 on the guiding portion 125 to drain such dripping water from the guiding portion 125.

As shown in FIG. 16, a plurality of drain holes 125b may be spaced apart from the protrusions 126 at predetermined intervals along the web feeding direction.

According to the web production line of the present invention as described above, an appropriate amount of water can be applied to the web after drying, thereby effectively preventing or suppressing warping or bending of the double-sided web.

Claims (15)

In the web humidifier used in the production line of the double-sided corrugated web; An elastic roll positioned corresponding to at least one side in the continuous feeding of the double-sided web and rotatable in the web feeding direction or the opposite direction, the elastic roll having at least a surface layer as an elastic material such as rubber or elastomer; A metal roll which is pressed against the elastic roll and rotates in the opposite direction to the elastic roll and whose roll surface is adjusted to have a surface roughness of at least 50 µm Ra or more; Water feeding means for feeding water between the elastic roll and the metal roll; And the elastic roll and the metal roll are connected to the double-sided web in the web feeding direction and rotate, and the water is applied to the surface of the web. 2. The elastic roll of claim 1, wherein the elastic roll is arranged to contact the double-sided web, and water buried on the metal roll is transferred to the elastic roll which is pressed by the metal roll and rotates, and the water is transferred to the double-sided web by the elastic roll. Web humidifier, characterized in that applied. In the web humidifying apparatus used in the production line of the double-sided corrugated web; In the continuous feeding of the double-sided web, an elastic roll which is located corresponding to at least one side and is rotatable in the web feeding direction or the opposite direction and composed of at least a surface layer of an elastic material such as rubber or elastomer, A metal roll which is rotated in a direction opposite to the elastic roll as being pressed against the elastic roll; Water feeding means for feeding water between the elastic roll and the metal roll; The bullet roll is arranged to connect with the double-sided web, water buried on the metal roll is transferred to the elastic roll that is pressed by the metal roll to rotate and the water is applied to the double-sided web by the elastic roll Web humidifier. 4. The web humidifier according to any one of claims 1 to 3, wherein the web humidifier is arranged downstream of the drying apparatus for drying a tackifier for adhering the upper liner and the lower liner to the corrugated intermediate to form a double-sided web. , The web humidifier, characterized in that for adding water to the double-sided web after drying. The web humidifier according to any one of claims 1 to 4, wherein at least the surface layer of the elastic roll is made of an absorbent rubber material. According to any one of claims 1 to 5, wherein the surface of the metal roll is formed with a plurality of cavities water is accommodated in these cavities, the roll distance adjusting mechanism for adjusting the distance between the shaft roll and the elastic roll Including; The elastic material of the elastic roll enters into the cavity of the metal roll by an amount determined by the interaxial distance between the rolls, and thus the amount of water transferred from the metal roll to the elastic roll is changed to the cavity after the elastic roll intrusion. Web humidifier, characterized in that adjusted according to the volume of water remaining in the. 7. The web humidifier according to claim 6, wherein the cavity is a plurality of dimples scattered on the metal roll. 8. The web humidifier of claim 7, wherein the elastic material has a Vickers hardness range of 10-30 degrees, and the dimples are formed on the metal material roll with a density of 20-50 mesh. The web humidifier according to any one of claims 1 to 8, wherein the plurality of sets of elastic rolls and metal rolls are disposed along a feeding path of the double-sided web. 10. A web humidifier according to any one of the preceding claims, comprising an air curtain device for blocking or inhibiting steam diffusion from the double-sided web after water is applied upstream and / or downstream. 20. The device according to any one of claims 1 to 19, further comprising a guiding part below the double-sided web to enable continuous feeding and to guide the web cutting device located downstream. A series of lateral stripe-shaped protrusions are provided on the surface of the guiding portion in the web feeding direction, The face web is a web humidifier, characterized in that supported by the projection. 12. The web humidifier according to claim 11, wherein a drain portion is formed between the laterally adjacent protrusions of the stripe shape on the guiding portion. The web humidifier according to claim 12, wherein the drain part is a drain hole respectively opened in an upper surface of the guiding part. By bonding the upper liner and the lower liner to the corrugated intermediate material, a web forming apparatus for forming a double-sided web, arranged on the downstream side of the web forming apparatus and corrugated with rigid liners in a double-sided web from the web forming apparatus A corrugated web manufacturing line comprising a drying apparatus for drying an adhesive for bonding an intermediate material, and a web humidifying apparatus according to any one of claims 1 to 13. 15. A web according to claim 14, further comprising: a guiding portion for supporting the double-sided web from the drying device downward and guiding toward a web cutting device located downstream, wherein a series of laterally spaced stripe-shaped protrusions Corrugated web manufacturing line, characterized in that formed on the surface of the guiding portion in the direction and the double-sided web is supported by the protrusion.