JPH0253971A - Sheet-formed mold-releasing material having permanent strain by creasing process - Google Patents

Abstract

PURPOSE:To obtain a mold-releasing sheet holding a permanent strain and having random pattern and irregular unevenness and undulations by creasing and straining a substrate made of paper and synthetic resin sheet, applying a synthetic resin composition to the substrate and setting the resin. CONSTITUTION:A mold-releasing sheet consisting of a substrate comprising a paper, a synthetic resin sheet, etc., or the substrate coated with a mold- releasing agent or laminated with a mold-releasing film is optionally pretreated (e.g., heating, cooling or moistening) and subjected to creasing process (e.g., beating, tugging or crumpling) to apply strain to the substrate. The treated substrate is coated with a synthetic resin composition (e.g., in such a manner as to fill the recess of the crease and smooth the protruded part), impregnated with the composition or laminated with a backing material such as paper or film to decrease the shrinkability. The objective mold-releasing sheet can be produced by setting the resin to keep the permanent strain. A synthetic leather having irregular and natural crease full of variety can be produced by using the above mold-releasing material.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The process of coating a polymer solution such as a vinyl composition or a polyurethane composition onto a sheet-like template and drying it to form a film is performed in sequence. Transfer (or transfer) in which the sheet-like release material is peeled off after laminating the film-like materials and finally the base fabric.
It is used in fields related to raw materials used when manufacturing synthetic leather etc. according to the law.

(b) Conventional technology Conventionally, a thin film layer of silicone, polyolefin, etc., which serves as a mold release agent, is formed on paper of a predetermined uniform thickness to a uniform thickness to create a smooth surface or an embossed surface. was provided.

(c) Problems to be Solved by the Invention Conventional 2. Coating methods for synthetic leather, etc., are based on the coating method, that is, in this case, sheet-like release method 4. J is processed by adjusting the thickness using a coating knife or a gap between the rolls between mechanical unwinding and winding. , the distance between the convex top and the back surface of the unevenness (i.e.

It was necessary to make the "thickness" uniform.

In this case, there was a suitable method to obtain a uniform uniform pattern.

The present invention does not have such an objective, but rather aims to obtain a natural wrinkle pattern rich in asymmetrical changes, which has not been seen before.

However, when trying to do this, when using this sheet-like mold release material, the wrinkles are slightly stretched due to the tension during the mechanical unwinding and winding steps, and the unevenness becomes apparent. The top becomes smaller.

) Means to solve the problem When using a sheet-like release phase, it stretches slightly,
If you leave something stretched out, it will try to return to its original shape. In other words, elasticity is observed. In order to eliminate or reduce this phenomenon as much as possible, use paper and fiber sheets with low elongation.・The permanent deformation caused by the wrinkling process is maintained by laminating (adhesive backing) or by painting or impregnating with a synthetic resin composition after the crinkling process.

In addition, the problem of wear and tear on the mold agent after wrinkle processing or the treatment of the mold release agent on the sample itself was solved by coating, spraying, impregnating, etc.

(E) By laminating paper, fiber sheets, films, etc. backing material, the wrinkles are fixed like two-corrugated cardboard.

In addition, by processing with 1 synthetic resin composition etc.
Dimensional stability is improved because the setting includes the fiber entangled structure of the wrinkled part and the loosening parts such as the release agent layer.

(f) Examples Example 1 A sheet-like release material made by laminating a polypropylene film onto kraft paper as a base material is held between two points with a pair of gripping rolls at a predetermined interval, and the interval is narrowed. Apply the texture by shaking the roll, knead it to create wrinkles, and then roll it up.

Separately, a two-component polyurethane was applied at about 70 f/nl using a knife coater onto kraft paper, which was the same base material used for sheet release.

For wrinkling, the back sides of sheet-like release mold 4', A are put together and passed between rolls with a predetermined gap and dried at about 80°C for 1 to 3 minutes. Aging is performed at room temperature (approximately 20°C) for 24 hours.

In this way, the convex portions on the back side of the sheet-like release material are adhered to the kraft paper as the backing material, and wrinkles do not elongate due to tension.

Of course, adhesion will be more reliable if the adhesive is applied to the surface of the base material by spraying or the like.

When creating wrinkles, depending on the constituent materials of the sheet-like release material,
Heating and cooling as pre-treatment before wrinkle processing.

Humidification, etc. are performed, and after the wrinkle processing, processing such as heating, cooling, humidification, etc. is performed as necessary as a post-processing setting.

The following Examples 2 and 3 relate to wrinkle retention after wrinkle processing.

Example 2 Toluene solution containing surface-treated calcium carbonate mainly composed of polymethyl methacrylate (viscosity, approximately 3000
cps) on the back side of the wrinkled sheet-like release material, fill in the creases (troughs), evaporate the solvent at 800-120'C, dry, and set. .

Example 3 A synthetic resin composition prepared by mixing ketones (methyl ethyl ketone and others), luene, etc. with an epoxy resin (for example, Epicor 1.1001 manufactured by Neru Kagaku Co., Ltd.) as the main ingredient and diethylene triamine as an auxiliary agent was wrinkled. Approximately 50 g/gospray coating was applied to the back side of the sheet-like release material, and the coating was dried with hot air at 40° to 60°C for several hours to harden and set.

The above is an example of implementation, but as base materials for the mold release agent, various papers, fiber sheet materials (woven fabrics, non-woven fabrics, etc.), inorganic materials such as ceramics and their components, etc. Plastic films and sheets containing aluminum carbonate and the like are used as fillers for warping and aluminum oxide.

Examples of the mold release agent include polyolefins such as silicone, fluorine, polyamide, polycarbonate, polyacetal, polyester, polypropylene, and polyethylene, metal foil, and metal vapor deposited film.

As a coating or impregnating solution for stabilizing the distortion caused by wrinkle processing, in addition to the same type of release agent, reaction-curing resins such as acrylic, epoxy, and melamine can be used.

Regarding processing, release agents are used for laminating or coating films before wrinkle processing, and for coating (painting) after wrinkle processing.
coating, spraying, impregnation, etc.).

Stabilizing wrinkle processing [2] Coating, spraying, impregnation, etc. can be used for painting synthetic resin compositions.

Regarding wrinkle processing, beating (for example, 1-batch type drumming), folding 2, for example, wrinkle processing such as cross:
Wrinkles are created by passing through a pressure device narrower than the width of the workpiece, by randomly overfeeding the workpiece, or by processing such as so-called kneading as in the embodiment.

(g) Effects of the invention By wrinkling the sheet-like mold release material, random patterns and asymmetrical unevenness and undulations are created, and the wrinkles create small wrinkles and branches in and around the large book. Form.

By processing this with a synthetic resin composition, the formation of wrinkles is stabilized, and this sheet-like release material can be used repeatedly in the production of films and synthetic leather by transfer or transfer methods, increasing the economic efficiency. becomes higher.

In addition, products manufactured using this technology come in a variety of patterns with a three-dimensional and natural feel.

Claims (1)

[Scope of Claims] 1. A sheet-like release material made of paper, synthetic resin sheet, etc. as a base material, either as it is, or coated with a release agent or laminated with a film for the release agent, as it is, Alternatively, pretreatment such as heating, cooling, and humidification may be applied, and wrinkle processing such as beating, tucking, and rolling may be applied to create distortion.
Painted or impregnated with a synthetic resin composition, or laminated with a backing material such as paper, fiber sheets, films, etc. to reduce elasticity, and left as is, or
After performing post-processing such as heating, cooling, and humidification, the
A sheet-like mold release material that retains permanent deformation due to wrinkle processing, either as it is or treated with a mold release agent. 2 Fill the wrinkled valleys of the base material with a synthetic resin composition,
2. A sheet-like release material that retains permanent deformation due to wrinkling according to claim 1, characterized in that it is set so as to be smooth at or near the top of the release material. 3. Wrinkling processing according to claim 1, characterized in that a reactive or thermosetting synthetic resin composition is coated or processed on a base material or a surface of a mold release agent, and set by reaction or thermosetting. A sheet-like release material that maintains permanent deformation. 4 Processing one or both sides of the base material or backing material such as paper, fiber sheets, films, etc. with a substance that becomes an adhesive, and pasting both sides together, 2. A sheet-like release material that retains permanent distortion due to wrinkling according to claim 1, which is set as is or after being subjected to heating, cooling, and humidification treatment.