JP2000190388A - Method and apparatus for producing sheet, and double- side protected pattern sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the peelability from a strip-like member well as compared with a sheet having a recessed pattern formed on the single surface thereof and to enhance tensile strength, in a sheet used as a liner for taking up a strip- like member having self-adhesiveness. SOLUTION: A polyethylene sheet 40 has projected parts 40A, 40B forming a lattice-like pattern, wherein a large number of ribs having a triangular shape cross each other, provided on both surfaces thereof. When this polyethylene sheet 40 is interposed as a liner when a strip-like member having self- adhesiveness is taken up, a large number of gaps are formed between the strip- like members by the projected parts 40A, 40B. Therefore, the peelability from the strip-like member having self-adhesiveness becomes well and, since the patterns on both surfaces of the polyethylene sheet 40 have a projected shape, tensile strength can be enhanced as compared with a conventional recessed pattern sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided convex pattern sheet used as a liner when winding a sticky band-shaped member into a roll, a method of manufacturing the sheet, and a sheet manufacturing apparatus.

[0002]

2. Description of the Related Art In general, in a manufacturing machine for manufacturing a sheet such as a policyt sheet having a concave portion such as a groove by roll forming, an iron rotary roll having a convex portion formed on a surface thereof, and a rotating roll opposed to the rotary roll. 2. Description of the Related Art A take-up machine including an iron nip roll whose surface is coated with silicon rubber or the like is known.

FIG. 6 shows an example of a rotary roll and a nip roll provided in such a take-up machine.

On the surface of the rotating roll 70, a projection 70A is provided.
(Convex pattern) is formed by cutting.

The projection 70A has a longitudinal section of 1 m at right angles.
It is a trapezoidal rib of m (width: W5 in the figure) × 1 mm (height: H5 in the figure), and a plurality of ribs cross each other to form a lattice-like pattern.

The inner space between the ribs is 2.7 mm (L in the drawing).
5, the pitch is 3.7 mm), and the longitudinal direction of the rib is inclined by about 45 degrees with respect to the axial direction of the rotating roll 70.

On the other hand, in the nip roll 80, the surface of the coated silicone rubber 84 is smooth.

[0008] These rolls are arranged facing each other as shown in the figure, and are further arranged in a take-up machine in a state of being pressed.

The rotating roll 70 is rotated by a driving force transmitted by a motor. Therefore, the nip roll 8
This driving force is also transmitted to the zero side, and the two rolls rotate while being pressed against each other.

[0010] When producing a policyt made of polyethylene (thermoplastic resin), for example, with this take-off machine, the production method is as follows.

[0011] The polyethylene pellets are melted by an extruder, a T-die, or the like, and supplied between the rolls from above both rolls. The molten pellets (hereinafter referred to as molten resin)
The sheet is roll-formed by rotation of the rotating roll 70 and the nip roll 80, and is cooled and solidified.

During this roll forming, the convex portion 70A of the rotating roll 70 is roll-pressed on the molten resin. Therefore,
On one side of the manufactured policyt, a concave portion (concave pattern) in which the convex portion 70A is inverted is formed.

FIG. 7 shows the structure processed by the above manufacturing method.
A policy 90 is shown.

A concave portion 90A (concave pattern) in which the convex portion 70A is inverted is formed on one surface of the policyt 90, and a flat surface 90B is formed on the opposite surface side.

In this case, the concave portion 90 of the policyt 90 is used.
A is a trapezoidal groove having a longitudinal perpendicular cross section of about 0.25 mm (width: W6 in the figure) × about 0.25 mm (depth: H6 in the figure), and a plurality of grooves are formed to intersect with each other. It becomes a lattice pattern.

The inner space between the grooves is about 2.7 mm (L in the figure).
6), the grooves are arranged such that the longitudinal direction is inclined at about 45 degrees with respect to the longitudinal or width direction of the policyt 90.

Conventionally, the policyt 90 may be used as a liner for winding a belt-shaped member in which an unvulcanized rubber sheet having adhesiveness is continuously formed.

The winding liner referred to here means that when the above-mentioned band-shaped member is wound up in a roll and stored, the front and back surfaces of the band-shaped member do not come into direct contact with each other. It is a sheet that is superimposed on the belt-shaped member so that the front and back surfaces do not adhere.

The roll-shaped band-like member with the sheet interposed is generally unwound by an unwinding device or the like, and is processed. In this unwinding device, the belt-shaped member and the sheet are separated while being conveyed at a constant speed.

The liner for winding up the belt-like member used in this manner is naturally required to have a releasability as an important function. In the policy 90 here, the recess 90
Due to the gap formed between A and the belt-like member, the releasability from the belt-like member is maintained to some extent.

[0021]

However, on the side of the plane 90B of the policyt 90, the band-shaped member is in close contact with the entire surface. Therefore, in the case of a member having particularly strong adhesiveness, the releasability from the belt-shaped member is extremely deteriorated as compared with the concave portion 90A surface side.

Further, if there is partial unevenness in the peeling resistance (or adhesive strength), the tension acting when the policyt 90 is separated from the belt-shaped member is increased in a portion where the resistance is high.

Here, as described above, the policyt 90 has a disadvantage in tensile strength because the concave portion 90A of a lattice pattern is formed on one side by a trapezoidal groove. That is,
When pulled, it is easier to cut from the recess 90A than a sheet or the like having both flat surfaces.

Due to these factors, when the policyt 90 is unwound by the unwinding device, it may be cut during the processing of the product, and the remaining fragments may be mixed into the product. In addition, there is also a problem that productivity is lowered due to interruption of the product processing.

Further, due to such unwinding conditions and durability, the policyt 90 cannot be used repeatedly as a liner for winding a belt-shaped member. Therefore,
The used policyt 90 is discarded or used by reprocessing.

As described above, the cost of manufacturing such a new sheet generated in accordance with the production amount of the belt-shaped member, the cost of reworking the used sheet, and the capital investment due to the addition of a sheet manufacturing machine, increase these costs. It was desired to improve the problem.

In the tire manufacturing process, members such as belts, wire chafers, and rubber chafers are being expanded to product processing by an unwinder.

However, in the use of such other members as a liner, productivity has been remarkably reduced due to occurrence of cutting or the like.

In consideration of the above facts, the present invention provides a sheet used as a liner for winding a sticky band member into a roll, which has a better peeling property from the band member than a conventional sheet and has a tensile strength. It is an object of the present invention to provide a double-sided convex pattern sheet having improved strength, a sheet manufacturing method thereof, and a sheet manufacturing apparatus.

[0030]

According to a first aspect of the present invention, there is provided a first roll having a concave pattern formed on a surface thereof and a second roll having a concave pattern formed on a surface rotating in opposite directions to each other.
The sheet material is supplied between the first and second rolls to obtain a sheet having a convex pattern formed on the surface.

The operation of the sheet manufacturing method according to the first aspect will be described.

A concave pattern is formed on the roll surfaces of the first roll and the second roll, and the rolls rotate in opposite directions. A sheet material is supplied between the first roll and the second roll to form a roll. As a result, the concave pattern on the roll surface is inverted to the sheet material, and a sheet having convex patterns formed on both surfaces is obtained.

Thus, a concave pattern is formed on the surface,
Although a simple method of feeding a sheet material between two rolls rotating in opposite directions, a sheet having a convex pattern formed on both surfaces can be continuously and efficiently manufactured.

Further, since the convex pattern is formed on both sides of the sheet, compared with a conventional sheet having a concave pattern formed on one side, the sheet is used as a liner for winding an adhesive band-shaped member. In addition, the releasability from the belt-like member is good, and the tensile strength of the sheet is improved.

According to a second aspect of the present invention, in the sheet manufacturing method according to the first aspect, the sheet material is a molten thermoplastic resin.

The operation of the sheet manufacturing method according to the second aspect will be described.

The molten thermoplastic resin, which is a sheet material, is roll-formed and then solidified by cooling to obtain a sheet having a convex pattern formed on both surfaces.

Here, the workability is good because the sheet material is molten. Therefore, even when the sheet is thinly processed or the shape of the convex pattern is small, the processing can be easily performed.

According to a third aspect of the present invention, in the sheet manufacturing method according to the first or second aspect, the concave pattern formed on the surface of the first roll and the second roll has a lattice shape. It is characterized by being.

The operation of the sheet manufacturing method according to the third aspect will be described.

On the surfaces of the first roll and the second roll,
A lattice-shaped concave pattern is formed, whereby a sheet having a lattice-shaped convex pattern formed on both surfaces is obtained.

As described above, while a simple method of forming a roll between two rolls having a lattice-shaped concave pattern formed on the surface, a sheet having a grid-shaped convex pattern formed on both sides is obtained. It can be manufactured continuously and efficiently.

Further, since the convex pattern of the sheet is in a lattice shape, the releasability from the adhesive band-shaped member is further improved.

According to a fourth aspect of the present invention, there is provided a first roll having a concave pattern formed on a surface thereof, a second roll having a concave pattern formed on a surface thereof and facing the first roll, Rotation driving means for rotating at least one of the first roll and the second roll, and the first roll and the second
And a supply means for supplying the sheet material between the rolls.

The operation of the sheet manufacturing apparatus according to the fourth aspect will be described.

The sheet material is supplied by a supply means between a first roll having a concave pattern formed on the surface and a second roll having a concave pattern formed on the surface and pressed against the first roll. Supplied. Further, at least one of the first roll and the second roll is rotated by the rotation driving means, and the sheet material is roll-formed while being conveyed between the rolls.

As described above, the first roll having the concave pattern formed on the surface, the second roll having the concave pattern formed on the surface and pressure-bonding the first roll, and Although the apparatus has a simple configuration of a combination of a supply unit for supplying a sheet material and a rotation driving unit for rotating at least one of the first roll and the second roll, a sheet having a convex pattern formed on both surfaces is provided. It can be manufactured continuously and efficiently.

Further, since the convex pattern is formed on both sides of the sheet, compared with a conventional sheet having a concave pattern formed on one side, the sheet is used as a liner for winding an adhesive band-shaped member. In addition, the releasability from the belt-like member is good, and the tensile strength of the sheet is improved.

According to a fifth aspect of the present invention, in the sheet manufacturing apparatus of the fourth aspect, the surface of one of the first roll and the second roll is formed of an elastic material, The first roll and the second roll are pressure-bonded.

The operation of the sheet manufacturing apparatus according to the fifth aspect will be described.

The surface of either one of the first roll and the second roll is formed of an elastic body, and the first roll and the second roll are pressed against each other. Errors such as pitch and parallelism between the first roll and the second roll are absorbed. Therefore, even when a very thin sheet is manufactured, the thickness of the sheet can be processed substantially uniformly.

According to a sixth aspect of the present invention, in the sheet manufacturing apparatus according to the fourth or fifth aspect, the concave pattern formed on the surface of the first roll and the second roll has a lattice shape. It is characterized by being.

The operation of the sheet manufacturing apparatus according to claim 6 will be described.

On the surfaces of the first roll and the second roll,
A lattice-shaped concave pattern is formed, whereby a sheet having a lattice-shaped convex pattern formed on both surfaces is obtained.

As described above, the sheet having the lattice-shaped convex pattern formed on both sides is continuously formed by the apparatus having the simple structure of providing the space between the two rolls having the lattice-shaped concave pattern formed on the surface. It can be manufactured efficiently.

Further, since the concave pattern formed on the surface of the roll has a lattice shape, the concave pattern can be formed by relatively simple processing.

Further, since the convex pattern of the sheet is in a lattice shape, the releasability from the adhesive band-shaped member is further improved.

According to a seventh aspect of the present invention, in the sheet manufacturing apparatus according to the fifth or sixth aspect, the surface of one of the first roll and the second roll is an elastic material. The concave pattern of the roll formed by
It is characterized by being formed by laser processing.

The operation of the sheet manufacturing apparatus according to claim 7 will be described.

Since the processing of the concave pattern is performed by a laser, no stress is applied to the processing surface unlike a mechanical processing or the like. Therefore, even if the roll surface is a soft elastic body or the shape of the concave pattern is small, accurate processing can be performed.

The invention according to claim 8 is a double-sided convex pattern sheet interposed as a liner when winding a sticky band-shaped member, wherein a large number of gaps are formed between the both sides of the sheet. Is characterized by forming a convex pattern for forming the pattern.

The operation of the double-sided convex patterned sheet according to the eighth aspect will be described.

When the double-sided convex pattern sheet is interposed as a liner when winding the sticky band-shaped member, the convex patterns formed on both sides form a large number of gaps between the sheet and the band-shaped member. .

As a result, the double-sided convex pattern sheet has better releasability from the adhesive band-shaped member than a conventional sheet having a concave pattern formed on one side.

Since the patterns on both sides of the sheet are convex,
The tensile strength is improved as compared with the conventional concave sheet.

According to a ninth aspect of the present invention, in the double-sided convex pattern sheet according to the eighth aspect, the convex pattern has a height of 0.05 mm or more.

The operation of the double-sided convex patterned sheet according to the ninth aspect will be described.

When the height of the convex pattern of the double-sided convex pattern sheet is 0.05 mm or more, an appropriate gap is formed near the base of the belt-shaped member and the convex pattern.

As a result, the belt-shaped member does not completely adhere to the flat portion other than the convex pattern of the sheet, and the double-sided convex-shaped pattern sheet has better releasability from the adhesive band member.

When the height of the convex pattern is less than 0.05 mm, the gap near the base of the belt-shaped member and the convex pattern becomes small, and the band-shaped member covers the entire surface of the sheet other than the convex pattern. Approaching the state of being in close contact. Therefore,
The releasability from the adhesive band-shaped member is deteriorated.

According to a tenth aspect of the present invention, in the double-sided convex pattern sheet according to the eighth or ninth aspect, the convex pattern has a width of 2.0 mm or less.

The operation of the double-sided convex patterned sheet according to the tenth aspect will be described.

The width of the convex pattern of the double-sided convex pattern sheet is 2.
When the thickness is 0 mm or less, the belt-shaped member does not adhere to the convex pattern of the sheet, and an appropriate contact area is secured between the band-shaped member and the convex pattern.

Thus, the double-sided convex-shaped pattern sheet can maintain better releasability from the adhesive band-shaped member.

When the width of the convex pattern is more than 2.0 mm, the belt-like member approaches a state in which the belt-like member is in close contact with the convex pattern of the sheet, and the releasability from the adhesive band-like member is deteriorated.

According to an eleventh aspect of the present invention, in the double-sided convex pattern sheet according to any one of the eighth to tenth aspects, the convex pattern comprises a plurality of convex ribs crossing each other. It is characterized by a lattice shape.

The operation of the double-sided convex pattern sheet according to the eleventh aspect will be described.

Since the convex pattern of the double-sided convex pattern sheet has a lattice shape composed of a plurality of convex ribs crossing each other, an appropriate gap is secured between the belt-shaped member and the convex pattern.

Thus, the double-sided convex-shaped pattern sheet can maintain better releasability from the adhesive band-shaped member.

According to a twelfth aspect of the present invention, in the double-sided convex pattern sheet according to the eleventh aspect, the lattice-shaped convex pattern has an inner interval of the convex ribs of 1.0 mm or more.
It is characterized by being less than 0 mm.

The operation of the double-sided convex pattern sheet according to the twelfth aspect will be described.

When the inner spacing between the convex ribs of the double-sided convex pattern sheet is less than 1.0 mm, the contact area between the belt-shaped member and the convex pattern increases, and when the inner spacing exceeds 5.0 mm, In this case, the contact area between the belt-shaped member and the plane portion other than the convex pattern is increased, and the peelability is deteriorated.

Therefore, when the inner distance between the convex ribs is 1.0 mm or more and 5.0 mm or less, the double-sided convex pattern sheet can keep the releasability from the adhesive band-shaped member better.

[0084]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a policy manufacturing machine 10 according to an embodiment of the present invention. The policy manufacturing machine 10 includes an extruder 100 for supplying a molten resin,
The apparatus includes a take-up machine 12 that rolls a molten resin into a sheet shape to form a policy, and a take-up machine 200 that transports and winds the manufactured policy.

Hereinafter, embodiments of the present invention will be described in the order of these configurations.

On the right side of the extruder 100, a hopper 102 as a sheet material input section is provided upright, and on the left side, a T-die 106 as a sheet material supply section is provided via a joint 104.

A screw (not shown) for extruding a sheet material is provided inside the extruder 100.

The T die 106 has a flow path (not shown) through which the sheet material passes, and an opening 108 as a flow path outlet is attached to the joint 104 so as to face downward.

The flow path has a cross-sectional shape extending in an inverted T-shape from the upstream side to the opening 108 and is heated by a heater (not shown).

The T-die 106 according to the present embodiment is
The opening 108 is 0.2 to 0.7 mm (thickness) x 1900
mm (width) slit, and the heating temperature of the channel is 15 mm.
It is set at 0 ° C to 160 ° C. As the sheet material, polyethylene which is a thermoplastic resin is used.

Thus, the polyethylene pellets fed from the hopper 102 are
06, is heated and melted while passing through the flow path, and is extruded downward from the opening 108.

On the other hand, below the T-die 106, the take-off machine 12
Is installed. FIG. 2 and FIG.
2 shows the rolls arranged.

A rotating drum 20 having a cylindrical shape is rotatably supported by the machine base 14 of the take-off machine 12, and a rotational driving force is transmitted from a rotating drive motor 24 provided in the machine base 14.

The rotating roll 20 is made of iron and has an outer shape of 250 mm (diameter) × 1900 mm (length) × about 20 m.
m (thickness).

Further, on the roll surface of the rotating roll 20,
A lattice-shaped recess 20A (concave pattern) is formed.

The recess 20A has a longitudinal cross section at a right angle of 0.
5 mm (width: W1 in the figure) x 0.5 mm (depth: H in the figure)
The triangular groove of 1), in which a plurality of triangular grooves cross each other to form a lattice-like pattern. The internal distance between the triangular grooves is 2.5 mm (L1 in the figure, the pitch is 3 mm), and the longitudinal direction of the triangular grooves is inclined by about 45 degrees with respect to the axial direction of the rotary roll 20.

This triangular groove is processed by knurling, and the roll surface is polished and chrome-plated after the groove processing.

Further, a cylindrical nip roll 30 is disposed on the machine base 14 so as to face the rotary roll 20 and is rotatably supported.

The nip roll 30 has a core made of iron and has an outer shape of 200 mm (diameter) × 1900 mm (length) × about 17.5 mm (wall thickness). Two layers of rubber are attached to the surface of the iron core. The lower layer has a hardness of 70
The lower rubber 30 has a hardness of 20 mm (thickness) and the upper layer is a silicon rubber 34 having a hardness of 70 ° ± 2 ° and 5 mm (thickness).

Therefore, the diameter of the nip roll 30 is 250 mm, which is the same as that of the rotating roll 20.

On the roll surface (the surface of the silicone rubber 34) of the nip roll 30, a lattice-shaped concave portion 30A (concave pattern) is formed.

The recess 30A has a right angle cross section in the longitudinal direction.
5 mm (width: W2 in the figure) x 0.5 mm (depth: H in the figure)
2) The plurality of triangular grooves cross each other to form a lattice pattern. The internal distance between the triangular grooves is 2.5 mm (L2 in the figure, the pitch is 3 mm), and the longitudinal direction of the triangular grooves is parallel and perpendicular to the axial direction of the nip roll 30.

This triangular groove is processed by a laser. However, any other method that can be processed to the required accuracy can be employed (for example, grinder polishing or the like).

Further, the nip roll 30 is pressed against the rotary roll 20 by a pressing device 36 provided inside the machine base 14, and the rotary roll 20 and the nip roll 30 are pressed under a predetermined pressure. Therefore, when the rotation roll 20 rotates, the nip roll 30 also rotates following the rotation.

Note that the crimping device 36 according to the present embodiment
The pressing force of the nip roll 30 is set to about 600 kgf.

The rotating roll 20 and the nip roll 3
0 denotes an opening 10 in which the crimping portion is provided in the T-die 106.
8 and is arranged on the machine base 14 so that the width direction of the opening 108 and the axial direction of the roll are parallel to each other, and is disposed on the machine base 14 (the depth direction in FIG. 2).

Thus, the molten resin extruded from the T-die 106 is supplied between the rotating roll 20 and the nip roll 30 which rotate with respect to each other, and is processed into a policyt 40 having a predetermined thickness by roll forming.

At this time, in the policyt 40, the concave portion 20A of the rotating roll 20 and the concave portion 34A of the nip roll 30 are roll-pressed and inverted to form convex portions (convex patterns) on both surfaces.

FIGS. 4 and 5 show this policy 40
It is shown.

On both sides of the policyt 40, a convex portion 40A and a convex portion 40B are formed by inverting the concave portion 20A and the concave portion 30A.

The convex portion 40A obtained by inverting the concave portion 20A is a triangular rib having a cross section perpendicular to the longitudinal direction of about 0.07 mm (width: W3 in the figure) × about 0.07 mm (height: H3 in the figure). , A plurality of ribs intersect each other in a lattice-like pattern.

The internal spacing of the ribs is about 2.5 mm (L3 in the figure), and the ribs are arranged in such a manner that the longitudinal direction is inclined at about 45 degrees with respect to the longitudinal or width direction of the policyt 40.

The convex portion 40B obtained by inverting the concave portion 30A is a triangular rib whose right-angle cross section in the longitudinal direction is about 0.07 mm (width: W4 in the figure) × about 0.07 mm (height: H4 in the figure). , A plurality of ribs intersect each other in a lattice-like pattern.

The internal spacing of the ribs is about 2.5 mm (L4 in the figure), and the longitudinal direction of the ribs is arranged parallel and perpendicular to the longitudinal or width direction of the policyt 40.

On the other hand, on the left side of the take-up machine 12,
00 is installed.

The winding machine 200 is provided with a plurality of winding rollers 202 for conveying a sheet. Here, in the present embodiment, the winding speed of the policyt 40 is set to about 10 m / min.

Further, a trimming 204 is provided in the middle of the sheet conveying path of the winding roller 202 to cut a surplus portion at both ends in the sheet width direction.

Further, on the left side of the winder 200, a turret 206 is provided.

A turret 206 is provided with a spindle 208 which is rotated by a drive motor (not shown) and winds the sheet.

In the present embodiment, the turret 206
Is a two-axis turret having two spindles 208.

The biaxial turret has a structure in which, when one of the spindles 208 is fully wound, the cutter is automatically cut by a cutter (not shown), and the turret 206 is inverted so that the other spindle 208 is automatically wound. Thus, the two spindles 208 alternately and efficiently perform the winding operation.

As a result, the rolled polisto 40 is conveyed to the winding roller 202 of the winder 200, and the excess portions at both ends in the width direction are cut by the trimming 204 during the conveyance, and then sent to the turret 206. . In the turret 206, the policyt 40 is wound by the spindle 208. (Test Example) In order to prove the effect of the present invention, a test was conducted on the peeling resistance and the tensile strength of the sheet.

The sheets measured by the test are the policyt 40 of the present invention in which convex patterns are formed on both sides and the conventional policyt 90 in which a concave pattern is formed on one side.

In the peeling resistance test, a pressure-sensitive adhesive tape (gum tape) having a width of 20 mm was attached to each sample sheet, and the pressure-sensitive adhesive tape was pulled in the longitudinal direction at a speed of 1000 mm / min to peel off the sample sheet, and the tensile load was measured.

In the tensile strength test, 40 mm (width) ×
Using each sample sheet of 0.34 mm (thickness), the cutting load when both ends of the sheet were pulled in the longitudinal direction at a speed of 1000 mm / min was measured.

Table 1 shows the results of these tests.

The comparative example sheet in the table is the policyt 90, and the example sheet is the policyt 40.

[0128]

[Table 1]

As a result of the test, the peel strength of the example sheet was about 1/8 and the tensile strength was at least twice that of the sheet of the comparative example.

In the embodiment of the present invention, the convex portions formed on both surfaces of the sheet have a triangular cross-sectional shape and a lattice pattern in which a plurality of ribs cross each other.

However, the cross-sectional shape and pattern of the projection are not limited to these. By changing the concave portion of the roll, various shapes can be formed or combined.

For example, the cross-sectional shape of the rib is square, trapezoid,
It can also be semicircular or semielliptical.

The pattern may be such that protrusions of various shapes such as a square or a circle are arranged discretely.

Thus, the policy 40 of the present invention
The heights of the convex portions 40A and the convex portions 40B formed on both surfaces are both about 0.07 mm and 0.05 mm or more, so that the releasability from the adhesive band-shaped member is further improved.

The width of each of the projections 40A and 40B is about 0.07 mm, and when the width is 2.0 mm or less, the releasability from the adhesive band-shaped member is further improved.

Further, the pattern of the convex portion 40A and the convex portion 40B has a lattice shape composed of a plurality of ribs intersecting with each other.
When the thickness is not less than 5.0 mm, the releasability from the adhesive band-shaped member can be better maintained.

[0137]

As described above, according to the sheet manufacturing method of the first aspect, a concave pattern is formed on the surface,
Although a simple method of feeding a sheet material between two rolls rotating in opposite directions, a sheet having a convex pattern formed on both surfaces can be continuously and efficiently manufactured.

Further, since the convex pattern is formed on both sides of the sheet, compared with a conventional sheet having a concave pattern formed on one side, the sheet is used as a liner for winding an adhesive band-shaped member. In addition, the releasability from the belt-like member is good, and the tensile strength of the sheet is improved.

According to the sheet manufacturing method of the present invention, since the sheet material is molten, the workability is good, and even if the sheet is processed thinly or the shape of the convex pattern is small, the processing is performed. Becomes easier.

According to the sheet manufacturing method of the third aspect, while a simple method of performing roll forming between two rolls having a lattice-shaped concave pattern formed on the surface,
Sheets having a lattice-like convex pattern formed on both sides can be continuously and efficiently manufactured.

Further, since the convex pattern of this sheet is in a lattice shape, the sheet is more easily peeled off from the adhesive band member.

According to the sheet manufacturing apparatus of the fourth aspect, the first roll having the concave pattern formed on the surface and the second roll having the concave pattern formed on the surface and pressure-bonded to the first roll are provided. 2 roll, a supply means for supplying a sheet material between the rolls, and a rotation drive means for rotating at least one of the first roll and the second roll. The sheet on which the convex pattern is formed can be continuously and efficiently manufactured.

Further, since the convex pattern is formed on both sides of the sheet, compared with a conventional sheet having a concave pattern formed on one side, the sheet is used as a liner for winding an adhesive band-shaped member. In addition, the releasability from the belt-like member is good, and the tensile strength of the sheet is improved.

According to the sheet manufacturing apparatus of the fifth aspect, the surface of one of the first roll and the second roll is formed of an elastic body, and the first roll and the second roll are formed. Due to the pressure bonding, the deformation of the elastic body absorbs errors such as the pitch and parallelism between the first roll and the second roll, so that even if a very thin sheet is manufactured, the thickness of the sheet can be processed substantially uniformly.

According to the sheet manufacturing apparatus of the sixth aspect, a lattice-shaped convex pattern is formed on both sides by an apparatus having a simple structure in which a space between two rolls having a lattice-shaped concave pattern formed on the surface is provided. Can be manufactured continuously and efficiently.

Further, since the concave pattern formed on the surface of the roll has a lattice shape, the concave pattern can be formed by relatively simple processing.

Further, since the convex pattern of the sheet is in a lattice shape, the releasability from the adhesive band-shaped member is further improved.

According to the sheet manufacturing apparatus of the present invention, since the processing of the concave pattern is performed by the laser, no stress is applied to the processing surface unlike the machining or the like, and the roll surface is a soft elastic body. Even if the concave pattern has a small shape, accurate processing can be performed.

According to the double-sided convex pattern sheet according to the eighth aspect, when the sticky belt-shaped member is interposed as a liner when winding the band-shaped member, the convex pattern formed on both sides is in contact with the band-shaped member. By forming a large number of gaps between them, the releasability from the adhesive band-shaped member is improved as compared with a conventional sheet having a concave pattern formed on one side.

Further, since the patterns on both sides of the sheet are convex,
The tensile strength is improved as compared with the conventional concave sheet.

According to the double-sided convex pattern sheet according to the ninth aspect, since the height of the convex pattern is 0.05 mm or more, the belt-shaped member is entirely formed on a flat portion other than the convex pattern of the sheet. There is no close contact, and the releasability from the adhesive band-shaped member is further improved.

According to the double-sided convex pattern sheet according to the tenth aspect, since the width of the convex pattern is 2.0 mm or less, the belt-shaped member does not adhere to the convex pattern of the sheet, and thus the adhesive pattern is formed. The releasability from the strip-shaped member having the property can be kept better.

[0153] According to the double-sided convex pattern sheet of the eleventh aspect, the convex pattern has a lattice shape composed of a plurality of convex ribs that intersect with each other, so that the belt-shaped member and the convex pattern are interposed. An appropriate gap is secured, and the releasability from the adhesive band member can be better maintained.

According to the double-sided convex pattern sheet according to the twelfth aspect, the inner distance between the convex ribs is 1.0 mm or more and 5.0 m or more.
By being not more than m, the releasability from the adhesive strip can be better maintained.

As described above, the double-sided convex pattern sheet of the present invention has better peelability and improved tensile strength as compared with the conventional sheet having a concave pattern formed on one side. Used as a liner when winding an adhesive band-shaped member into a roll, even when unwound by an unwinding device, it is advantageous for cutting during product processing, and residual fragments are mixed into the product. Can also be prevented.

Further, since the interruption of the product processing due to the cutting is eliminated, the productivity can be prevented from lowering.

Further, the durability can be improved by improving the tensile strength, so that the belt-shaped member can be repeatedly used as a liner.

Accordingly, the cost of manufacturing a new sheet and the cost of reworking a used sheet are greatly reduced, and capital investment of a sheet manufacturing machine is also avoided. Therefore, the improvement of these cost increases can be realized.

Further, in the use as a liner to other members in the tire manufacturing process, productivity is improved.
Therefore, the double-sided convex pattern sheet of the present invention can sufficiently cope with expansion of product processing by such an unwinding device.

[Brief description of the drawings]

FIG. 1 is a schematic overall configuration diagram of a policyd manufacturing machine according to an embodiment of the present invention.

FIG. 2 is a sectional view of the take-off machine according to the embodiment of the present invention.

FIG. 3 is a perspective view of a rotating roll and a nip roll according to the embodiment of the present invention.

FIG. 4 is a perspective view of a policyt according to the embodiment of the present invention.

FIG. 5 is a perspective view of a policyt according to the embodiment of the present invention.

FIG. 6 is a perspective view of a rotating roll and a nip roll according to a conventional embodiment.

FIG. 7 is a perspective view of a policyt according to a conventional embodiment.

[Explanation of symbols]

Reference Signs List 20 rotating roll (first roll) 20A recess (concave pattern) 24 rotation drive motor (rotation driving means) 30 nip roll (second roll) 30A recess (concave pattern) 32 lower rubber (elastic body) 34 silicon rubber (Elastic body) 40 Policy (sheet material / thermoplastic resin / sheet / double-sided convex pattern sheet) 40A Convex part (convex pattern / convex rib) 40B Convex part (convex pattern / convex rib) 100 Extruder (Supplying means) 106 T die (Supplying means)

Claims (12)

[Claims] 1. A sheet material is supplied between a first roll having a concave pattern formed on its surface and a second roll having a concave pattern formed on its surface, rotating in opposite directions to each other. A sheet manufacturing method comprising obtaining a sheet having a convex pattern formed on a surface. 2. The sheet manufacturing method according to claim 1, wherein the sheet material is a molten thermoplastic resin. 3. The sheet manufacturing method according to claim 1, wherein the concave patterns formed on the surfaces of the first roll and the second roll are lattice-shaped. 4. A first roll having a concave pattern formed on a surface thereof, a second roll having a concave pattern formed on a surface thereof facing the first roll, and the first roll or the first roll having a concave pattern formed on a surface thereof. 2
A sheet manufacturing apparatus comprising: a rotation drive unit configured to rotate at least one of the rolls; and a supply unit configured to supply a sheet material between the first roll and the second roll. 5. The surface of one of the first roll and the second roll is formed of an elastic body, and the first roll and the second roll are pressure-bonded. The sheet manufacturing apparatus according to claim 4. 6. The sheet manufacturing apparatus according to claim 4, wherein the concave patterns formed on the surfaces of the first roll and the second roll are lattice-shaped. 7. The concave pattern of one of the first roll and the second roll, the surface of which is formed of an elastic body, is formed by laser processing. The sheet manufacturing apparatus according to claim 5 or 6, wherein 8. A double-sided convex pattern sheet interposed as a liner when winding a sticky band-shaped member,
A double-sided convex pattern sheet, wherein convex patterns for forming a large number of gaps between the belt-shaped members are formed on both surfaces. 9. The double-sided convex pattern sheet according to claim 8, wherein the convex pattern has a height of 0.05 mm or more. 10. The double-sided convex pattern sheet according to claim 8, wherein the convex pattern has a width of 2.0 mm or less. 11. The double-sided convex pattern sheet according to claim 8, wherein the convex pattern has a lattice shape composed of a plurality of convex ribs intersecting each other. . 12. The double-sided convex pattern sheet according to claim 11, wherein the lattice-shaped convex pattern has an inner interval of the convex ribs of 1.0 mm or more and 5.0 mm or less.