JPS58142821A - Manufacture of composite object - Google Patents

Abstract

PURPOSE:To improve the slip preventing property of a composite object, providing an unevenness to the surface of a substrate, by lapping a fibrillated plane object to a planar object to become the substrate so as to be shifted relatively to a direction different from a proceeding direction when sticking them together. CONSTITUTION:While a foamed, fibrillated plane object 12 is obtained by using an extruder, extruding from a T-die at ca. 230 deg.C a compound composed of ca. 99wt% of a low density polyethylene and ca. 1wt% of a foaming agent, an azodicarbonamide as the raw material of the foamed, fibrillated plane object and foaming, fibrillating, a film 13 is obtained by extruding a single polypropylene at ca. 250 deg.C, using another extruder. Then, a composite film 16 is obtained by introducing both, being in an unsolidified state, to a casting roll 14 of which the surface temperature is 95 deg.C, shifting relatively at an amplitude of ca. 3cm so as to reciprocate once a ca. 10cm of an advance, lapping, sticking together, cooling and solidifying.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for producing a composite material with poor surface slipperiness.
Ill. The composite as used in the present invention refers to a film, sheet, or plate.

In recent years, improvements have been made to materials in order to streamline the transportation of various products and improve work safety.

Among these, the above-mentioned improvement is often possible by making the surface slippery worse.

For example, slip sheets have recently become popular in place of pallet K to streamline transportation, and it is clear that the greater the friction coefficient between the upper surface and the cargo, the better the work efficiency.

In addition, the high coefficient of friction on the surface is effective in preventing bags of rice, fertilizer, sugar, etc. from collapsing and falling during stacked transportation or storage.

Conventionally, as a countermeasure against this problem, the base material has been coated with a resin (EVA, EPR Semi) or rubber having a relatively high friction coefficient.

The present inventors have conducted various studies to increase the friction coefficient of the surface of a planar body, and as a result, they have found that the present invention is different from the present invention. By pasting the shaped planar bodies together and making these two planes deviate relative to each other in a direction different from the direction in which they are moving,
By creating a composite material with aggressively numbered irregularities on the surface of the base material, it was possible to improve slip prevention.

The present invention will be explained in more detail below.The planar body referred to in the present invention refers to those made of thermoplastic resin or paper, and in each case also includes composites using these. Examples of the spread planar body include thermoplastic resin spread film, thermoplastic resin planar body with many holes, and different layer extrusion K.
Those made of thermoplastic resin in a net shape, those made by making cuts in a thermoplastic resin flat body and stretching it into a net shape, and those made by braiding thermoplastic resin fibers, filaments, and tape thickness into ring ropes. Any material that can positively provide unevenness can be used.

What is important in the present invention is that when laminating, the planar body and the spread planar body are not simply overlapped in parallel in the same direction; This is to make the slip properties even worse by laminating them while shifting them in a different direction.

If the method of the present invention does not shift as shown in 5, this is probably because the directionality in the laminating direction is poor, but the slipperiness in the winding direction cannot be deteriorated. Therefore, as a result of various studies on methods to prevent this, it was discovered that this can be achieved by laminating while being relatively shifted according to the present invention.

A method for carrying out the present invention will be specifically described.

In order to do this more easily than when extruding and laminating the spread planar body with thermoplastic resin while extruding the planar body with thermoplastic resin, it is necessary to laminate both in an unsolidified state and cool and solidify them to form a composite. It is better to A composite can be obtained if one of the two is previously coated with a thermoplastic resin.

Furthermore, when both have been formed into a film in advance, a composite can be obtained by supplying them to a hot roll, for example, heating them to a temperature sufficient to fuse them, bonding them together, and then cooling and solidifying them.

Furthermore, when bonding these together, it is also possible to use a true melt agent or the like as an intermediate layer.

In the manner described above, the composite of the present invention exhibiting a high friction coefficient can be obtained. Examples of the present invention will be described below.

Example 1 Low-density polyethylene 9 was used as a raw material for a expanded expanded planar body.
A formulation consisting of 9% by weight of a blowing agent and 1% by weight of azodicarboxylic acid amide was prepared using a 30ins21 extruder, and as shown in the schematic diagram of Figure 1, a mixture of ℃ extrusion, foaming and opening to form a foamed and expanded planar body (
While obtaining b), use another extruder 4(h+iJ1) to extrude polypropylene at 250°C.
3 was obtained, both of them were introduced in an unsolidified state onto a casting roll 14 with a surface temperature of 95°C, and they were stacked with a relative amplitude of 31 so as to make one reciprocation every time they moved about 10 cm, stacked, laminated, and cooled. After solidification, a composite film 16 was obtained. A perspective view of a part of this composite film cut into a rectangular shape is shown in FIG. 2, and FIG. 3 shows the cut plane IZA in FIG. 2.

In these figures, 22 and 32 are low-density polyethylene foam spread planar layers, and 21 and 31 are polypropylene film layers. The thickness of the polypropylene film layer of this composite film was 40 Am, and the thickness of the low-density polyethylene foam spread-like planar layer had a basis weight of 10V7r+'' at the thicker part of about 100 μm.

The sliding friction angle between the polypropylene film surfaces of this composite film was measured and found to be 20°, but the sliding friction angle between the expanded foamed flat surfaces used in the present invention was 69°, making it extremely difficult to slip. did it.

Here, for comparison, when the sheets were bonded normally without shifting, the result was as low as 38° in the direction of travel.

Example 2 The roll shown in FIG. 4 (see below) is obtained by forming a film in advance from a low-density polyethylene foamed expanded planar material obtained by forming a expanded expanded planar material in the same manner as in Example 1. While unwinding the film 42, using a 40 mxl extruder, extrude the unsolidified film 43 of low density polyethylene extruded from the T-die 41 at 230°C by relatively 3 (one reciprocation every time it advances approximately 101 times with an amplitude of 11ff). The composite was introduced onto a casting roll 44 with a surface temperature of 95° C. while being shifted so as to be in contact with each other, laminated together, and cooled and solidified to obtain a composite having a form similar to that of Example 1.

The thickness of this low-density polyethylene film layer is 40 μm.
It was μm.

The sliding friction angle between the expanded foamed flat surfaces of this composite film is 61°, and the sliding friction angle between the back surfaces (smooth surfaces) is 18°.
and a sufficient effect was obtained.

Example 3 Using kraft paper with a thickness of 80 μm and the low-density polyethylene foam expanded flat body used in Example 2, the kraft paper 53 was rewound as shown in FIG. 5 and placed on a heating roll 54 with a surface temperature of 140°C. The low-density polyethylene expanded fiber-shaped planar body 52 supplied through a preheating roll 54 with a surface temperature of 100° C. is reciprocated once every time it travels approximately 10 clL with an amplitude of 3 (1!Ill). After overlapping them while shifting them as shown and crimping them with a pinch roll 57,
It was cooled by passing through a cooling roll with a surface temperature of 80°C to obtain a composite film.

The sliding friction angle between the surfaces of the expanded expanded planar surfaces of this composite film is 55°, and the angle of sliding friction between the surfaces of the kraft paper is 27°.
In this case, a sufficient effect was obtained.

[Brief explanation of the drawing]

FIG. 1 shows a co-extrusion laminate.
14 and 15 are cast rolls, respectively, and guide rolls 16 are composite films laminated to extruded low-density polyethylene, foamed open-fiber planar polypropylene films 14 and 15, respectively. 2 is a perspective view of a rectangular cut product of the composite film in FIG. 1, and FIG. 3 is a sectional view showing cut planes a and b in FIG. 2, and in the figure, 21 and 31 are polypropylene film layers. 22 and 32 indicate low-density polyethylene foam spread planar layers. Fig. 4 is a schematic diagram of extruding and laminating a planar body onto a foamed spread-shaped planar body that has been formed in advance. A density polyethylene film, 44 is a casting roll 45, and a guide roll 47 is a composite film consisting of 46 guide rolls that can vibrate in the axial direction. FIG. 5 is a schematic diagram of laminating a foam spread-like flat body formed into a film in advance and kraft paper. In the figure, 52 and 53 are low-density polyethylene foam spread-shaped flat bodies, and kraft paper 54 and 5, respectively.
5, 57, 58 and 59 are heating rolls. The axially vibrating preheat roll, pinch roll, cooling roll and guide roll 56 are laminated composite papers. 10... T-die that can vibrate in the width direction 11... T-
Die 12... Foamed spread planar body 13... Polypropylene film 14, 15... Casting roll 16... Composite film a, b... Cut surfaces 22, 23.
... Foaming spread planar layer 21, 31... Polypropylene layer 41... T-die 42... Foaming spread planar material 43... Film 44... Casting roll 45... Guide Roll 46...Complex 4
7... Guide roll 52 that can vibrate in the axial direction... Foamed spread-like flat body 53... Kraft paper 56... Composite paper 54,
55, 57, 58, 59... Heating roll, preheating roll that vibrates in the axial direction, pinch roll, cooling roll, guide roll Patent applicant Mitsui Toatsu Chemical Co., Ltd.

Claims (1)

[Scope of Claims] (1) When a planar body is used as a base material, at least the whole of one box or -S surface EIK, and the spread planar body (6) is laminated to provide unevenness, the planar body is and the planar body holder and the spread flat body (6) in a direction perpendicular to the traveling direction of the spread flat body (6).
A method for manufacturing a composite, characterized in that (b) is carried out while being shifted relative to each other, thereby impairing the slipperiness of the surface. (2) Manufacture according to claim 1, characterized in that the fleshy body extrudes thermoplastic resin, while the spread flat body (2) extrudes thermoplastic resin, and the mixture is laminated to form a composite. Method. (3) For the rkJ-shaped body, extrude thermoplastic resin and prepare 11! from thermoplastic W resin in advance. 2. The manufacturing method according to claim 1, wherein the membraned spread-like planar body (b) is supplied to a heated roll if necessary and bonded together to form a composite. (4) The spread planar body (6) extrudes thermoplastic resin. 2. The manufacturing method according to claim 1, characterized in that the planar body (2) formed in advance is fed to a heated roll if necessary and bonded together to form a composite. (5) a thermoplastic resin planar body (4) formed into a film in advance;
The pre-formed thermoplastic resin fibrous planar body (6) is supplied to a heating four, and laminated (to form a composite).
Manufacturer as claimed in claim 1 (6)
The manufacturing method described in Patent-Kyuken [111g1] characterized in that the spread planar body (1) is made by extruding a thermoplastic resin and laminating it with a paper-made planar body (2) to form a composite. (7) A spread-shaped flat body made of thermoplastic resin that has been pre-treated with ** (6
) and a paper figure-like body (2) are heated, supplied to ..., and bonded together to form a composite.
Manufacturing method described in section.