JPH0367021B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing a composite with reduced surface slipperiness. Specifically, the present invention relates to a method for producing a sheet-like, film-like, or plate-like composite material having a high surface friction coefficient.

[Conventional technology]

In recent years, the transportation and distribution of various goods has increased with the development of industry. Therefore, efforts have been made to improve the materials used for transporting goods or transporting them, in order to streamline them, improve their safety, and so on.

For example, when moving a large amount of goods, a method is used in which the goods are stacked on pallets and transported using a forklift or the like. Furthermore, slip sheets are also used instead of pallets. The higher the friction coefficient of the surface of these pallets and slip sheets, the more useful they are in terms of preventing the load from collapsing.

Additionally, rice, fertilizer, sugar, etc. are often packed in bags. If the friction coefficient of the sheet or film used as the bag material is high, the cargo will not collapse easily, allowing for high stacking, and also preventing the cargo from collapsing during transportation.

Conventionally, as a countermeasure against the above problem, the surface of the base material has been coated with a resin (EVA, EPA, etc.) or rubber having a relatively high friction coefficient.

JP-A-51-130476 discloses that the surface of a plastic film extruded from an extruder is coated with a foamed plastic layer, and the plastic film is stretched in one direction to destroy voids in the foamed plastic layer, thereby creating irregularities on the surface. A method for producing a film has been proposed.

However, in the method disclosed in this publication, after covering a plastic film as a base material with a foamed plastic layer, both are stretched in the same direction. The layers are oriented in the longitudinal direction, and the film has a relatively high slipperiness in the longitudinal direction, making it unsatisfactory as a packaging or transportation material.

[Problem to be solved by the invention]

An object of the present invention is to solve the above-mentioned problems and to provide a method for producing a sheet-like, film-like, or plate-like composite body having a high surface friction coefficient in a well-balanced manner in both vertical and horizontal directions.

[Means to solve the problem]

As a result of extensive studies, the inventors of the present invention found that when attaching a spread planar object to one or both sides of a planar object such as a sheet, film, or plate, the two objects are attached while swinging in the width direction. By combining
The inventors have discovered that the above problems can be solved and have arrived at the present invention.

The present invention is characterized by devising a method for bonding a planar body as a base material and a spread planar body as a material to be pasted.
The objective is to provide a high friction coefficient in a well-balanced manner in the longitudinal and lateral directions of the composite.

That is, the present invention provides unevenness on the surface of the planar body A by laminating the spread planar body B, which is the material to be pasted, on all or part of at least one side of the planar body A, which is the base material. This method of manufacturing a composite is characterized in that at least one of the planar body A and the spread planar body B is laminated together while swinging in the width direction.

The present invention will be explained in detail below.

The planar body in the present invention is a sheet, film, or plate made of thermoplastic resin or paper. It may also be a composite of a thermoplastic resin sheet, film, or plate-like material and paper. The thickness of the planar body is 0.015
~20mm is preferable.

Thermoplastic resins include polyolefin resins,
General-purpose thermoplastic resins such as polyvinyl chloride resin and polystyrene resin are preferably used. There are no particular restrictions on the method for producing planar bodies from these resins, and any conventional extrusion molding method, calendar molding method, etc. may be used. The molding temperature is
It is common to mold at a temperature range of about 150 to 300°C.

A method for manufacturing a sheet body made of a composite of a thermoplastic resin sheet, film or plate and paper is as follows:
A method in which a thermoplastic resin film or the like is laminated onto paper by hot roll processing or press processing is preferably used. The laminating temperature may be within a temperature range where bonding is possible, such as a temperature equal to or higher than the melting point of the resin used.

Further, although there are no particular restrictions on the material of the paper, kraft paper is preferable in terms of price.

The spread planar body in the present invention is a foamed spread film obtained from a thermoplastic resin such as polyolefin resin, polyvinyl chloride resin, polystyrene resin, etc.
A hole of about 20 mm is made, or a thermoplastic resin flat body such as a film is cut and stretched to an equivalent length of 2.
Mesh shaped with openings of ~30 mm, mesh shaped with pores of approx. 1~50 mm in length by extrusion of thermoplastic resin, knitted net of thermoplastic resin fibers, tapes, etc. Any material, such as a braided material, can be used as long as it can positively create irregularities on the surface of the base material by bonding it to the base material.

As a method for manufacturing these spread-like planar bodies,
When molding the above resin into a film with a thickness of 15 to 1000 μm by melt extrusion at a temperature range of 150 to 300°C, an azo compound such as azobisisobutyronitrile is used as a blowing agent. Foam,
A method of opening the generated air bubbles;
Melt extrusion in the temperature range below 300℃, thickness 15~
A method of forming a film etc. of about 1000 μm and drilling holes with a diameter of 1 to 20 mm using an interlocking roll etc.
Make a cut of about 0.5 to 25 mm in the width direction of the film, etc., and stretch the film in the length direction,
Examples include a method of opening holes in a mesh shape of about 1 to 30 mm, and a method of braiding 50 to 2,000 denier fibers made of the above resin, or a tape with a thickness of 20 to 500 μm and a width of 0.1 to 5 mm. .

What is important in the present invention is that when bonding the planar body and the spread planar body together, they should not be stacked parallel to each other by aligning them in the same direction as their respective length directions. The aim is to bond the sheets together while swinging them in the width direction, thereby reducing slipperiness in the vertical and horizontal directions in a well-balanced manner.

In other words, the length of the spread planar material to be attached to the surface of the planar material is avoided so that, for example, the mesh openings such as holes are arranged regularly in the length direction of the planar material. It is important to balance the directional and lateral friction coefficients.

When the two are bonded together using the above method, the orientation of the resin is not limited to the vertical direction, but is effective in balancing the slipperiness in the vertical and horizontal directions.

If the spread planar body is simply bonded to the surface of the planar body with the length directions aligned without bonding the two together using the method of the present invention, the slipperiness in the longitudinal direction of the composite will not be reduced. Have difficulty.

In the present invention, the length direction of the planar body and the spread planar body is the direction in which the planar body and the spread planar body are manufactured by extrusion or the like and run through the process. The lateral direction is the direction perpendicular to the length direction,
That is, in the width direction.

When manufacturing a composite while extruding a planar body and a spread planar body, the T-die of at least one extruder is vibrated in the axial direction to extrude the planar body and/or the spread planar body. They can be vibrated in the width direction, and can be bonded together with their lengths intersecting each other.

In addition, if at least one of the sheet material or the spread sheet material is cooled and solidified into a scroll shape, when unwinding the sheet material, a guide roll that can vibrate in the axial direction may be used. By letting them out while swinging them in the lateral direction, the planar body and the spread planar body can be bonded together in a state where their length directions intersect.

A preferred embodiment of the method of the present invention will be described based on the drawings.

FIG. 6 shows an example of manufacturing a composite by simultaneously extruding a planar body and a expanded expanded fiber-like planar body.

In the figure, 61 shows a plan view of a T-die of an extruder for sheet-like bodies. The T-die is of a type that can vibrate in the width direction. The T-die 61 is located directly above the extruder T-die for the expanded expanded flat body. 62 shows a plan view of the casting roll.

The extruded planar body and the expanded expanded planar body are
Casting roll 6 from T-die each
Sent in two directions.

The expanded expanded planar body is extruded from a T-die located directly below the T-die 61 and guided to a casting roll 62 in the shape of a dgjid. On the other hand, the planar body has a T-die 6 that can vibrate in the width direction.
It is pushed out from 1. When the T-die 61 is vibrated to the left in the figure, the planar body is guided to the casting roll 62 in a cfjic shape and bonded to the planar body on the roll. At this time, the foamed expanded planar body is guided in a direction perpendicular to the casting roll 62, but since the planar body is guided in an oblique direction from the left side, the two are pasted together with their length directions intersecting. .

Further, when the T-die 61 is vibrated to the right in the figure, the planar body is guided to the casting roll 62 in the shape of an ehjie, and the length direction thereof intersects with the foamed spread planar body on the roll. are pasted together.

If the planar body and the foamed expanded planar body are extruded using T-dies that can vibrate in the width direction, extruded while vibrating each T-die in different left and right directions, and bonded together in the same manner as above, both The effect of bonding them together in a state where their length directions intersect is even greater.

For example, if the planar body and the expanded expanded planar body are resins having crystallinity, the surface temperature of the casting roll 62 will range from the melting point of the resin to the melting point +40
Can be bonded in a temperature range of ℃. Thereafter, it is cooled and solidified to form a composite.

FIG. 7 shows an example in which a composite is manufactured while extruding either a planar body or a spread planar body.

In the figure, reference numeral 63 indicates a plan view of the roll of the spread-like flat body. 64 shows a plan view of an axially vibrating guide roll for a spread flat body. There is a T-die of an extruder for planar bodies at a position directly below the guide roll. 65 shows a plan view of the casting roll. In the figure, the direction in which the planar body and the spread planar body are fed is the direction in which the roll of the spread planar body 6
3 is in the direction of the casting roll 65.

By extruding the planar object from the extruder T-die for planar objects located directly below the guide roll 64, the planar object is guided to the casting roll 65 in the shape of a twzyt.

On the other hand, the roll 63 of the spread flat body is unwound,
With the guide roll 64 that can vibrate in the axial direction,
It is guided to the casting roll 65 while being vibrated in the left and right directions shown in the drawing. If the guide roll oscillates to the left, the spread planar body is guided to the casting roll 65 in the shape of Klpvzysmk. Therefore, the planar body is guided in a direction perpendicular to the casting roll 65, but the foamed spread-like planar body is guided in an oblique direction from the left side, so that both are casted with their lengths intersecting. They are bonded together on a roll 65.

Further, when the guide roll 64 vibrates in the right direction, the spread planar body is guided to the casting roll 65 in the shape of Klrxzyuok.

Therefore, the planar body is casted by the casting roll 65.
However, since the expanded expanded planar foam is guided in an oblique direction from the right side, both are bonded together on the casting roll 65 with their length directions intersecting. Thereafter, it is cooled and solidified to form a composite.

When extruding the planar object, if a T-die that can vibrate in the axial direction is used to guide it to the casting roll 65 while vibrating in different directions to the left and right than the expanded expanded planar object, the length directions will intersect. The effect of bonding is even greater.

The above is an example in which the process is carried out while extruding a planar body, but the process can be carried out in the same way while extruding a foamed spread-like plane body.

For example, if the resin has crystallinity, the temperature of the casting roll is higher than the melting point of the resin.
A temperature of melting point +40°C is preferred.

If the planar body and the spread planar body are already rolled at the time of bonding, at least one of the rolls can be vibrated in the axial direction. After being unwound while vibrating from left to right and bonded together according to the method described in , the material is cooled and solidified to form a composite.

In either method, an adhesive such as a hot melt agent made of ethylene-vinyl acetate copolymer or the like may be used as an intermediate layer for bonding.

When attaching a spread planar body to a planar body,
The spread planar body may be bonded to both sides of the planar body, or to the entire surface of one side, or may be bonded to a portion of the planar body. If you want to paste a part,
50% of the surface area of the front and back sides of the planar body
It is desirable to bond them together. If it is less than 50%, it is not preferable because the reduction in slipperiness is insufficient.

Hereinafter, the present invention will be explained in more detail using Examples along with the drawings.

Note that the sliding friction angle in the present invention was measured by the following method.

Measuring method of sliding friction angle Measurement was performed at 23°C using an inclined plate type sliding friction angle measuring device (manufactured by Toyo Seiki Co., Ltd., model: AN).

A sample piece of the composite was placed on the inclined plate and the block (load: 1 kgf) so that the surfaces to be measured were in contact with each other, and the inclined plate was tilted from a horizontal state at a constant angular velocity of 2.7 degrees/second, so that the block was The angle at which sliding begins is defined as the sliding friction angle.

Example 1 A formulation consisting of 99% by weight of low density polyethylene and 1% by weight of azodicarboxylic acid amide as a blowing agent was prepared.
Using a 30 mmΦ extruder and a T-die 10 that can vibrate in the width direction as shown in the schematic diagram of Fig. 1,
It was extruded at 230° C. while being vibrated in the width direction, and expanded and opened to obtain a expanded and expanded planar body 12.

On the other hand, polypropylene alone was extruded at 250°C through a T-die 11 using a 40 mmΦ extruder to obtain a polypropylene film 13.

While guiding both of them in an unsolidified state onto a casting roll 14 with a surface temperature of 95° C., the foamed and expanded planar body 12 is moved back and forth once every time it advances approximately 10 cm with an amplitude of 3 cm relative to the polypropylene film 13. The composite film 16 was bonded together while swinging in the width direction, cooled and solidified, and sent to the next step via a guide roll 15 to obtain a composite film 16.

The above-mentioned method of bonding while swinging in the width direction will be explained using FIG. 6.

The polypropylene film is fed to the casting roll 62 in the form of a dgjid. On the other hand, the low-density polyethylene foam expanded fiber flat body is made of T-die 61
If it vibrates to the left in the figure, it is sent to the caster roll 62 in the shape of cfjic. Further, when the T-die 61 vibrates to the right in the figure, it is sent to the caster roll 62 in an ehjie shape. Therefore, on the caster roll 62, the polypropylene film and the low-density polyethylene foam spread-like planar body are bonded together with their respective length directions intersecting.

FIG. 2 shows a perspective view of a part of the obtained composite film cut into a rectangular shape. A cutaway view of ab in FIG. 2 is shown in FIG. 3.

In these figures, 22 and 32 indicate low-density polyethylene foam expanded planar layers, and 21 and 31 indicate polypropylene film layers.

The polypropylene film layer of this composite film 16 had a thickness of 40 μm, the low-density polyethylene expanded spread planar layer had a basis weight of 10 g/m ² , and the thickness of the thick portion was about 100 μm.

The sliding friction angle between the polypropylene film surfaces of this composite film was measured in the longitudinal direction of the film and was 20 degrees, and the sliding friction between the low-density polyethylene foam expanded planar layers in the film length direction was 20 degrees. The angle was 69 degrees. The expanded expanded planar layer was extremely hard to slip.

Comparative Example 1 A composite film was obtained in the same manner as in Example 1, except that the T-die was not oscillated from side to side when extruding the low-density polyethylene foam spread planar body.

The sliding friction angle in the longitudinal direction of the film between the planar layers of the low-density polyethylene foam expanded fibers of the obtained composite film was 38 degrees. Compared to Example 1, it was more slippery.

Example 2 First, a low-density polyethylene foam expanded flat body was obtained in the same manner as in Example 1, cooled and solidified, and then wound up to obtain a roll 42 shown in FIG. 4.

Further, low density polyethylene was extruded at 230°C through a T-die 41 using a 40 mmΦ extruder to obtain the unsolidified low density polyethylene film 43.

Scroll of low-density polyethylene foam expanded flat body 4
2, using a guide roll 47 that can vibrate in the axial direction, with an amplitude of about 3 cm relative to the unsolidified low-density polyethylene film 43.
While shaking the two in the width direction so as to make one reciprocation every 10 cm, the surface temperature was increased to 95.
The composite film 46 was guided onto a casting roll 44 at a temperature of 0.degree.

The method of making contact while swinging in the width direction will be explained using FIG. 7.

The low density polyethylene film is sent to the casting roll 65 in the form of a twzyt. on the other hand,
The low-density polyethylene foam spread planar body is vibrated to the left in the figure by a guide roll 64 that can vibrate in the axial direction, and is sent to a casting roll 65 in a klpvzysmk shape. In addition, when the guide roll 64 vibrates in the right direction in the figure,
It is sent to the casting roll 65 in the form of klrxzyuok. Therefore, on the casting roll 65, the low-density polyethylene film and the low-density polyethylene foam spread-like planar body are bonded together with their length directions intersecting each other.

The thickness of the low-density polyethylene film layer of the obtained composite was 40 μm, the basis weight of the low-density polyethylene foam expanded planar layer was 9 g/m ² , and the thickness at the thick part was approximately
It was 90μm.

The sliding friction angle in the longitudinal direction between the foamed spread planar bodies of this composite film was 61 degrees, and the sliding friction angle in the longitudinal direction between the back surfaces, that is, the low-density polyethylene films, was 18 degrees.

The expanded expanded planar layer of the composite film was extremely hard to slip.

Example 3 Kraft paper with a thickness of 80 μm and the expanded density polyethylene flat roll used in Example 2 were used.

As shown in FIG. 5, the kraft paper 53 was rewound via a guide roll 59 and fed onto a heating roll 54 whose surface temperature was 140°C.

On the other hand, the low-density polyethylene foam expanded flat material roll 52 is unwound via the guide roll 59, and is heated relative to the kraft paper using a preheating roll 55 that can vibrate in the axial direction and has a surface temperature of 100°C. After crimping using a pinch roll 57 on a heating roll 54 with a surface temperature of 140° C. while vibrating in the width direction so as to make one reciprocation every time it advances approximately 10 cm with an amplitude of 3 cm. , surface temperature 80
It was cooled and solidified by a cooling roll 58 at .degree. C. to obtain a composite paper 56.

A method of bringing the two into contact while swinging in the width direction will be described with reference to FIG. 7.

The kraft paper is sent to the casting roll 65 in the form of klqwzytnk. On the other hand, the low-density polyethylene foam expanded fiber flat body is vibrated to the left by a preheating roll (55 in FIG. 5) which can vibrate in the axial direction, which corresponds to 64 in the figure.
Casting roll 6 in the shape of klpvzysmk
Sent to 5. Further, when the preheating roll is vibrated to the right in the figure, it is sent to the casting roll 65 in the shape of klrxzyuok.

Therefore, on the casting roll 65, the kraft paper and the low-density polyethylene foam spread-like planar body are bonded together with their respective length directions intersecting.

The sliding friction angle in the length direction between the expanded expanded planar bodies of this composite paper was 55 degrees, and the sliding friction angle in the length direction between the back surfaces, that is, the kraft paper, was 27 degrees.

The expanded expanded planar layer of the composite paper was extremely hard to slip.

〔Effect of the invention〕

The composite obtained by the method of the present invention has a high surface friction coefficient in both the width direction and the length direction.

Therefore, when used as a material for packaging bags for rice, fertilizer, sugar, etc., or for transportation materials such as pallets, it is effective in preventing the load from collapsing, and is industrially useful.

[Brief explanation of drawings]

FIG. 1 shows a method of simultaneously extruding and laminating a planar body and a spread planar body. In the figure, 10 is a T-die that can vibrate in the width direction, 11 is a T-die, 1
2 is a low-density polyethylene foam expanded fiber-shaped flat body; 13
14 is a cast roll, 15 is a guide roll, and 16 is a composite film. FIG. 2 is a perspective view of a rectangular cut product of the composite film shown in FIG. 1. In the figure, 21 is a polypropylene film layer, 22 is a low-density polyethylene foam spread-like planar layer, and ab is a cut surface. FIG. 3 shows a sectional view taken along the a-b section of FIG. 2.
In the figure, 31 is a polypropylene film layer, 32 is a low-density polyethylene foam spread-like planar layer, and ab is a cut surface. FIG. 4 is a schematic diagram of extruding a planar body and laminating thereon with a solidified foamed expanded planar body previously formed into a film. In the figure, 41 is a T-die, 42 is a low-density polyethylene foam expanded planar body, 43 is a low-density polyethylene film, 44 is a cast roll, 45 is a guide roll, 46 is a composite film, and 47 is vibrating in the axial direction. Show the guide roll that can be done. FIG. 5 is a schematic diagram of pasting together kraft paper and a solidified foam spread-like flat body that has been formed into a film in advance. In the figure, 52 is a low-density polyethylene foam expanded flat body, 53 is kraft paper, 54 is a heating roll, 5
5 is a preheating roll that can vibrate in the axial direction, 57 is a pinch roll, 58 is a cooling roll, 59 is a guide roll, and 56 is a composite paper. FIG. 6 is a schematic diagram showing a planar body extruded from a T-die that can vibrate in the axial direction, and guided to a casting roll while being vibrated left and right by the T-die. In the figure, 61 is a T-die that can vibrate in the axial direction;
2 is casting roll, cf, dg, eh are T-
The width of the sheet extruded from the die 61, ij, indicates the width of the sheet led to the casting roll 62. FIG. 7 is a schematic diagram showing a roll of a spread flat body guided to a casting roll while being vibrated from side to side by a guide roll that can vibrate in the axial direction. In the figure, 63 is a roll of the spread flat body, 64 is a guide roll that can vibrate in the axial direction, 65 is a casting roll, kl is the width of the roll of the spread flat body, mp,
nq, or, sv, tw, ux are the widths of the spread planar body vibrated left and right by the guide roll 64 that can vibrate in the axial direction, and yz is the casting roll 6
Fig. 5 shows the width of the roll of the spread-like planar body introduced in Fig. 5. Explanation of symbols, 10: T-die that can vibrate in the width direction, 11: T-die, 12: Foamed spread-shaped flat body,
13: Polypropylene film, 14: Casting roll, 15: Guide roll, 16: Composite film, ab: Cut surface, 22 and 32: Foamed spread planar layer, 21 and 31: Polypropylene film layer, 41: T- Die, 42: Foamed spread planar body, 43: Low density polyethylene film, 4
4: Casting roll, 45: Guide roll, 46: Composite film, 47: Guide roll that can vibrate in the axial direction, 52: Foamed spread-like flat body, 5
3: Kraft paper, 54: Heating roll, 55: Preheating roll that can vibrate in the axial direction, 56: Composite paper,
57: Pinch roll, 58: Cooling roll, 59:
Guide roll, 61: T-die that can vibrate in the axial direction, 62: Casting roll, 63: Spread planar scroll, 64: Guide roll that can vibrate in the axial direction, 65: Casting roll, cf, dg, and eh: Pushed from a T-die that can vibrate in the axial direction,
Width of the planar body vibrated left and right, ij: Width of the planar body guided by the casting roll, kl: Width of the roll of the spread planar body, mp, nq, or, sv, tw and ux:
Width of the spread flat body vibrated left and right by a guide roll that can vibrate in the axial direction, yz: Width of the spread flat body guided by the casting roll.

Claims (1)

[Scope of Claims] 1. A spread-like planar body B, which is a material to be pasted, is attached to all or part of at least one side of a planar body A, which is a base material, and unevenness is imparted to the surface of the planar body A. A method for manufacturing a composite body, which comprises bonding at least one of the planar body A and the spread planar body B while swinging them in the width direction. 2. The method according to claim 1, wherein the extruder T-die that can vibrate in the width direction or a roll that can vibrate in the axial direction is used to vibrate in the width direction. 3. The method according to claim 1, wherein the planar body and the spread planar body are obtained by melt-extruding a thermoplastic resin. 4. The method according to claim 1, wherein the planar body is paper. 5. The method according to claim 1, wherein the method is carried out while extruding at least one of the planar body and the spread planar body. 6. The method according to claim 1, wherein the planar body and the spread planar body are formed into a film or a sheet in advance to form a roll.