JPH07100997A - Manufacture of process sheet for manufacturing urethane foam - Google Patents

Abstract

PURPOSE:To provide a method for sufficiently reducing an adhering strength between a base sheet and a synthetic resin laminated film in a process sheet for manufacturing urethane foam. CONSTITUTION:A method for lightly peeling a process sheet 2 for manufacturing urethane foam has the step of forming the sheet of a base sheet 2a and a synthetic resin laminated film layer 2b made of polyolefin laminated on the sheet 2a in a temporarily laminated state. After the sheet 2a and the layer 2b are once peeled, they are again brought into contact with one another to temporarily laminate the sheet 2a and the layer 2b by degassing and static electricity. Thus, an adhesive strength of the sheet 2a to the layer 2b becomes smaller than that of urethane foam generated by foaming polyurethane resin on the layer 2b and the synthetic resin laminated film layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for lightly peeling process paper for producing urethane foam.

[0002]

2. Description of the Related Art The present applicant has already filed Japanese Patent Publication No. 54-202.
No. 27 and JP-A-64-44712, the adhesive strength between a base paper and a synthetic resin laminate film layer such as polyolefin laminated on the base paper as the process sheet for producing a urethane foam is the synthetic resin laminate film layer. By laminating the synthetic resin laminate layer on the base paper in a temporarily adhered state so that the adhesive strength between the urethane foam generated by foaming the polyurethane resin and the synthetic resin laminate film layer becomes smaller, A process paper for producing a urethane foam, in which a process paper is configured to be separable into two layers and only one layer (synthetic resin laminate film layer) is completely adhered onto the urethane foam surface to cover the foam surface, and Providing a method for manufacturing urethane foam using process paper, The Les corruption losses and urethane foam urethane material in the manufacturing process, as well as provide a method for preventing fouling.

[0003]

[Problems to be Solved by the Invention]
When a urethane foam is produced using the process sheet 10 for producing a urethane foam as disclosed in No. 4-20227, as shown in FIG. 3, the polyurethane resin M is formed on the synthetic resin laminate film layer 12b. After foaming the base paper 12a, the synthetic resin laminated film layer 12b
It is peeled from the roll and wound up by the winding roll 20.

However, in this case, since the adhesive strength between the base paper and the synthetic resin laminate film layer is not yet sufficiently small, winding resistance may be applied, and during the winding process, The synthetic resin laminate film may be cut or the base paper may be torn, so that the surface portion of the urethane foam is often peeled off as a broken fragment on the base paper surface. Therefore, in order to obtain a urethane foam slab product, it is necessary to slice the uneven fracture surface of the urethane foam surface to make the surface smooth, resulting in a large amount of material loss. Moreover, since the broken pieces of urethane foam or the synthetic resin film adhere to the peeled base paper, they cannot be reused and must be disposed of, thus presenting even a pollution problem. Further, since the synthetic resin laminate film layer may be cut, there is a problem that the manufactured urethane foam surface is stained.

In view of such circumstances, the present invention provides no method for further sufficiently reducing the adhesive strength between the base paper and the synthetic resin laminate film layer in the urethane foam manufacturing process paper. To aim.

[0006]

The present invention has been made in order to achieve the above-mentioned objects and objects of the prior art, and the gist thereof is a base paper and a temporary paper on the base paper. A method for lightly peeling a process paper for producing a urethane foam, which comprises a synthetic resin laminate film layer such as a polyolefin laminated in an adhered state, which comprises a base paper of the process paper and a synthetic resin laminate film layer. After being once peeled off and then brought into contact with each other again, the base paper and the synthetic resin laminate film layer are temporarily attached to each other by static electricity and deaeration, whereby the base paper and the synthetic resin laminate film layer are formed. The adhesive strength between the synthetic resin laminate film layer and the synthetic resin laminate film layer is formed by foaming polyurethane resin on the urethane foam and synthetic resin laminate film. A light release method of urethane foam manufacturing process paper, characterized in that to be smaller than the adhesive strength between the beam layer.

[0007]

Embodiments of the present invention will now be described in more detail with reference to the drawings.

First, FIG. 1 is a process schematic diagram for explaining a method for lightly peeling a process paper for producing a urethane foam according to the present invention.

In FIG. 1, reference numeral 1 is a supply roll, and the supply roll 1 is wrapped with a urethane foam manufacturing process paper 2. The urethane foam manufacturing process paper 2 is, as shown in FIG. 2, a base paper 2a.
An extremely thin synthetic resin laminate film layer 2b is laminated on the top of the base paper 2a. For example, as a method for obtaining process paper, polyethylene is applied on the base paper 2a as disclosed in Japanese Patent Publication No. 54-20227. It may be extruded and laminated at around 200 ° C. This is because when the extrusion temperature is as high as about 300 ° C., the base paper 2a
If the resin laminating film layer 2b is completely adhered to the upper side, but the extrusion temperature is relatively low at about 170 ° C., there is a problem in the extrudability of the resin. This is because, in consideration, it is the best in the case of about 200 ° C.

The thus constituted process paper 2 is guided by the supply rolls 1 by the guide rolls 3 and 4, and the base paper 2a and the synthetic resin laminate film layer 2b are interposed via the peeling pipe member 5. Between the layers (6 in FIG. 1).
(See FIG. 1), the base paper 2a and the synthetic resin laminate film layer 2b are brought into contact with each other again (see 7 in FIG. 1), the guide roll 8 or the nip roll 8 ′ having a large holding angle is used for deaeration, and the take-up roll 9 takes up It will be collected.

Thus, after the process paper 2 is once delaminated between the base paper 2a and the synthetic resin laminate film layer 2b, the base paper 2a and the synthetic resin laminate film layer 2 are again formed.
By bringing them into contact with b, a temporary attachment state is achieved with an extremely small adhesive strength due to the mutual action of static electricity. Therefore, the adhesive strength between the base paper 2a and the synthetic resin laminate film layer 2b is much smaller than the adhesive strength between the urethane foam and the synthetic resin laminate film layer, which are produced by foaming the polyurethane resin on the synthetic resin laminate film layer. It becomes possible to do.

The size of the peeling pipe member 5, the feeding speed of the process paper 2 and the like can be appropriately selected according to the desired adhesive strength due to static electricity.
Pipe size 18mmφ, supply speed 100m / min,
The peel strength is preferably 5 g / inch.

Example 1 Polyethylene was coated on the upper surface of kraft paper (75 g / m ² ) as a base paper by a well-known extrusion laminating method.
By extruding at 40 ° C., a polyethylene film layer having a thickness of 15 μm was formed on the base paper to obtain a process paper A.

Using this process paper A, the base paper and the polyethylene film layer were peeled off at a peeling pipe size of 18 mmφ and a supply rate of 100 m / min, and then they were brought into contact with each other again, and temporarily removed by the action of deaeration and static electricity. The stuck process paper B was obtained.

As a result of a peeling test using the process papers A and B, the peel strength of the process paper A was 5 g / inch, whereas the peel strength of the process paper B was close to 0. The peel strength of the process paper B, which was lightly peeled by, was extremely small.

[0016]

EFFECT OF THE INVENTION In the method for lightly peeling process paper for producing urethane foam of the present invention configured as described above, the base paper of the process paper and the synthetic resin laminate film layer are once peeled and then contacted again. Thus, the base paper and the synthetic resin laminate film layer are temporarily attached by deaeration and static electricity, whereby the adhesive strength between the base paper and the synthetic resin laminate film layer is improved. Since the adhesion strength between the urethane foam and the synthetic resin laminate film layer generated by foaming the polyurethane resin on the top is made extremely smaller, (1) after foaming the polyurethane resin on the synthetic resin laminate film layer, When peeling the base paper from the synthetic resin laminate film layer and winding it with a take-up roll, There is no resistance, and the synthetic resin laminate film is not cut or the base paper is not broken.

(2) Therefore, the surface portion of the urethane foam is not peeled off as broken fragments on the base paper surface, and the material loss is extremely small.

(3) Further, since the broken pieces of urethane foam or the synthetic resin film do not adhere to the peeled base paper, the base paper can be reused. It's huge when I go home.

(4) Further, since the urethane foam surface is completely covered with the synthetic resin laminate film layer, the manufactured urethane foam surface is not contaminated and the product quality can be improved. .

It is an extremely excellent invention that has many effects such as the above.

[Brief description of drawings]

FIG. 1 is a process schematic diagram for explaining a method for lightly peeling a process paper for producing a urethane foam according to the present invention.

FIG. 2 is a partially enlarged cross-sectional view of a process sheet for producing a urethane foam.

FIG. 3 is a schematic diagram illustrating a conventional method for producing a urethane foam using a process sheet for producing a urethane foam.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Supply roll 2 ... Urethane foam manufacturing process paper 2a ... Base paper 2b ... Synthetic resin laminate film layer 3, 4 ... Guide roll 5 ... Peeling pipe member 8 ... Guide roll 8 '... Nip roll 9 ... Winding roll

Claims (1)

[Claims] 1. A method for lightly peeling a urethane foam manufacturing process paper comprising a base paper and a synthetic resin laminate film layer such as a polyolefin laminated on the base paper in a temporarily attached state. Then, the base paper of the process paper and the synthetic resin laminate film layer are once peeled off, and then brought into contact with each other again, so that the base paper and the synthetic resin laminate film layer are temporarily attached to each other by static electricity and deaeration. None, whereby the adhesive strength between the base paper and the synthetic resin laminate film layer is higher than the adhesive strength between the urethane foam and the synthetic resin laminate film layer produced by foaming a polyurethane resin on the synthetic resin laminate film layer. A method for lightly peeling process paper for urethane foam production, which is characterized in that it is made smaller.