JPS6255119A - Manufacture of good surface embossing sheet - Google Patents

Abstract

PURPOSE:To impart truely an embossing pattern and to make good draping of an embossing sheet without damages, by preheating a sheet which is being embossed in the surface while being transferred along particular periphery of a roll circumference in accompany with the roll, then by embossing under pressure with an emboss roll. CONSTITUTION:A sheet S which is embossed in the surface is supplied through a guide roll 3 in such a manner that the surface of polymer contacts the surface of a heating emboss roll 1. Then it is preheated between the point A and point B of an emboss roll which is equivalent to the quarter of the circumference, thereafter the sheet is embossed under pressure at the point B. As the embossing on the surface of a polymer is preheated at the surface of the emboss roll, the unevenness of preheating of sheet surface hardly occurs. True embossing pattern can be imparted at relatively low pressure and low temperature, and as the sheet material is not exposed to eccessive temperature, hardening of the draping of embossing sheet is prevented. Natural peeling is possible and there are not any deformation of embossing pattern, occurrence of surface roughness or peeling transverse flow; consequently, embossing sheet having good embossed surface is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing a surface-embossed sheet having a good embossed surface by heating and pressurizing a sheet material having a smooth surface.

[Conventional technology]

Conventionally, many proposals have been made for methods of imparting stamped patterns to the surface of elastic polymers using a heat embossing method.

For example, Japanese Patent Publication No. 47-24662 discloses a method for producing a sheet material in which the open surface of an embossing roll is heated, then pressure embossing is performed, and the material is peeled off at peeling points provided at a certain distance; Japanese Patent Publication No. 55-6754, According to Japanese Patent Publication No. 57-25056 and Japanese Patent Publication No. 57-23037, a leather-like sheet having a porous coating layer is heated and embossed at 100 to 300°C, and the coating layer is embossed on the hot roll while being self-adhered to the hot roll. It is described that after a certain distance around the circumference is moved in i rows, the film is peeled off using a peeling roll provided on a heat roll.

As described above, the conventional method of imparting an embossed pattern to the surface of an elastic polymer is to emboss it with a heated embossing roll at high temperature and under high pressure, and to make it self-adhesive to the embossing roll, and to apply it at a certain distance on the circumference of the Sonoma embossing roll. The embossing roll is used to forcibly peel off the paper using an embossing roll.

[Problem that the invention seeks to solve]

In the conventional method, the surface of the elastic polymer is embossed directly, so sufficient embossing cannot be achieved without using high temperature and pressure.Furthermore, it is forced to peel off after being self-adhesive to the roll and heat treated. In addition, the embossed surface of the pressed sheet becomes rough, and if peeling is not smooth, the embossed surface becomes deteriorated, such as uneven peeling resulting in horizontal steps of peeling. Further, even if the sheet is self-adhered to the roll, the sheet surface often peels off from the embossing roll surface before reaching the peeling roll. In that case, the gloss may be uneven in the areas that are in close contact with the embossing roll and the areas that are floating from the embossing roll.
This causes the pattern to return and cause unevenness on the surface of the embossed sheet. Further, due to the heat embossing and forced peeling caused by high temperatures and high pressures, the texture of the embossed sheet becomes hard, the bones become wrinkled, and the surface becomes rough.

The present invention aims to solve the above-mentioned problems caused by conventional heat embossing and to provide a sheet with a good surface embossed surface.

[Means for solving problems]

The object of the present invention is to heat a sheet material having a surface composed of a polymer mainly composed of an elastic polymer, and apply pressure embossing to the surface of the polymer to impart a stamping pattern faithfully to the embossed roll pattern. To provide a method for manufacturing a surface-embossed sheet that does not impair the texture of the pressed sheet.

That is, the present invention involves heating and pressurizing a sheet material having a smooth surface made of a polymer mainly composed of an elastomeric polymer to produce a sheet material having an embossed surface. The sheet is brought into contact with the embossing roll (by means of a guide roll provided in front of the heated embossing roll), and is preheated by moving it along the roll at least 1/4 of the circumference of the roll, followed by pressure embossing with the embossing roll. It is characterized by:

Further, in the present invention, if the embossed sheet is brought into close contact with the embossing roll by self-adhesion to fix the stamped pattern, and then peeled off at the natural peeling point, a better surface-embossed sheet can be obtained.

Next, one embodiment of the present invention will be explained with the drawings.〇 Figures 1 and 2 are side views showing one embodiment of the present invention.

A pair of rolls 1.2 is an embossing device, 1 is an embossing roll equipped with a heating device, 2 is a bank roll, and 3 is a guide roll provided in front of the embossing roll. The surface-embossed sheet S has a polymer surface heated by the heating embossing roll 1.
The sheet is fed through a guide roll 3 so as to be in contact with the surface of the sheet, the embossing roll is preheated between points A and B, and then the sheet is pressurized and embossed at point B. If the embossed sheet has low self-adhesion, it will peel off at point 0 after a short heat treatment as shown in Figure 1, but if it has high self-adhesion, it can be heat treated over a long distance as shown in Figure M2. will be performed. Natural peeling occurs as the heat treatment progresses and the strain of the embossed sheet is relaxed. When the distance of the natural peeling point C is long, it is preferable for continuous production to additionally install a peeling roll 4 near the peeling point. It is also preferable that the peeling roll 4 is a variable type peeling roll that moves as the natural peeling point moves.

FIG. 3 is a side view for explaining the conventional method. The surface-embossed sheet S is immediately heated and pressurized at point B of the heating embossing roll 1 to be embossed and self-adhesive without being preheated, and then guided to the peeling roll 4 and forcing the embossed sheet at the peeling point C. It peels off.

In the method of the present invention, the surface-embossed sheet is preheated before pressure embossing, and pressure embossing is carried out while maintaining that state, so the temperature and pressure during embossing are lower than in conventional methods. You can choose the type of material you want, and you can also make a clear embossed pattern. The heating temperature of the embossing roll is usually about 100 to 190°C, preferably about 120°C.
It is preferable that the temperature is in the range of ~180°C, the embossing pressure is about 2~30~ in terms of surface pressure, and the strength of self-adhesion to the embossing roll is not high. The self-adhesive strength is determined by selecting a roll temperature and pressure at which the distance from the embossing pressure point B to the peeling point C is preferably from 1/8 to less than 1/2 of the roll circumference and the roll naturally peels off. If embossing is carried out at high temperatures and pressures that do not cause natural peeling, the embossed surface will become rough, resulting in an unfavorable surface condition, and the texture will harden, resulting in stiffness and distortion during embossing. This results in residue and curling.

The embossing roll used in the embossing of the present invention is an embossing roll that is heated from inside the roll, and the embossed pattern is engraved with various desired patterns in addition to various leather-like patterns.

The surface-embossed sheet of the present invention is a sheet-like product in which a porous or non-porous polymer surface layer formed using a polymer mainly composed of an elastic polymer is provided on the surface of a fibrous sheet, or an elastic It is a porous or non-porous polymer sheet-like material mainly composed of polymers.

The fibrous sheet may be a woven fabric, a knitted fabric, a raised woven fabric, a knitted fabric, a two-dimensional or three-dimensional entangled nonwoven fabric, and furthermore, these fabrics may contain porous or non-porous polymers. It is what was done. The elastic polymer constituting the polymer surface layer or polymer sheet has an average molecular weight of about SOO
Selected from thermoplastic polyurethane distomers obtained by reacting ~5000 polymer glycols with organic diisocyanates (or may contain small amounts of organic triisocyanates) and chain extenders, plasticized polyvinyl chloride, or polyamides. It is a polymer made of Furthermore, if necessary, the polymer is a polymer composition containing a polymer selected from polyacrylate or its derivative, polyvinylidene chloride, vinyl acetate copolymer, etc. These polymers or polymer compositions are A solution, a dispersion, or a polymer solution containing fine polymer particles is solidified by a wet method or a dry method to form a polymer surface layer or a polymer sheet of a porous polymer or a non-porous polymer; It is a sheet-like product with a smooth surface obtained by applying a finishing layer of a colored resin film and/or a transparent resin film to the surface.

〔Example〕

Next, embodiments of the present invention will be described with reference to Examples. Parts and parts in the examples refer to weight unless otherwise specified.

Example 1 An entangled nonwoven fabric of nylon fibers was filled with a polyester polyurethane elastomer 15 tidimethylformamide solution containing polybutylene adipate as a soft segment,
Further, the same polyurethane disstomer solution was applied to the surface in an amount such that the amount of polyurethane elastomer was a O'/FF/, and the solution was immersed in a 35% dimethylformamide aqueous solution to solidify. A colored ink composition consisting of 3% brown azo organic pigment and 91% solvent composition was applied to a solid content of 10 microns thick and dried to form small protrusions in a basketball pattern (recess depth approximately 900 microns). Using an embossing roll, heat the embossing roll to a temperature of 170°C, and bring the colored surface of the sheet into contact with the surface of the embossing roll using the guide roll provided on the front of the embossing roll in the manner shown in Figure 1. The pressed sheet was then preheated for about 30 seconds and then stamped with a surface pressure of 15"9/ci to make it self-adhesive, but it peeled off naturally at a distance of about 1/8th of the circumference from the pressing point. It had a concave-convex pattern with concave portions of about 60 microns, giving it a very three-dimensional effect and excellent flexibility.

For comparison, when a sheet material was directly fed to an embossing press point and embossed using the method shown in Figure 3, self-adhesion to the embossing roll was not obtained when the embossing roll was heated at a temperature of 170''C. The embossing roll could not be embossed in a sufficiently clean manner.When the temperature of the embossing roll was raised to a temperature at which self-adhesion occurred, the temperature was approximately 198°C. When it was peeled off, uneven peeling occurred, and the texture became even harder.

Example 2 A porous fiber sheet containing an elastic polymer mainly composed of polyester-based polyurethane nidistomer was made in an entangled nonwoven fabric of nylon ultrafine fiber bundles, and one side of the porous fiber sheet was coated with crosslinked polyurethane nidistomer. Fine particles 50
A composition liquid containing 3% red organic pigment added to a dispersion liquid was applied to a thickness of 10 microns in terms of solid content, and then 6% polycaprolactone-based polyurethane distomer was applied to the surface.
A solvent composition solution of 1.5 μm in solid content was applied to a thickness of 1.5 μm and dried to form a surface layer, resulting in an overall thickness of 1.5 μm.
A sheet-like product of On was obtained.

Next, the sheet-like material has a sheepskin pattern (the depth of the recess is approximately 200 mm).
Using the method shown in Figure 2, preheat the embossing roll for about 25 seconds by bringing it into contact with the surface of the embossing roll heated to 170°C. The distance was about 1/3 of a turn, and the heat treatment time during that time was about 25 seconds. Therefore, when we installed a position-variable peeling roll 4 at the natural peeling point and operated it continuously, we found that the pattern of the embossed roll was embossed with great fidelity, resulting in a sheet with a flexible texture and no surface roughness. I got something. This embossed sheet material was dyed red using a Wins dyeing machine, dried, and rubbed, but there was almost no change in the width or length of the sheet material.

For comparison, when a sheet material was directly fed to two embossing press points and embossed using the method shown in Fig. 3, the embossing roll surface, which provides self-adhesive properties, was peeled off unevenly when peeled from the embossing roll. Not only did it become narrower, but it also became narrower by about 18 inches in the width direction and had a large elongation in the length direction.

〔Effect of the invention〕

Since the embossing of the polymer surface of the present invention is preheated on the embossing roll surface, there is almost no uneven preheating on the sheet surface, and a faithful embossed pattern can be applied at a relatively low temperature and pressure. Since it does not add to the object, the texture of the embossed sheet is prevented from hardening, and natural peeling becomes possible, eliminating deformation of the embossed pattern, surface roughness, and occurrence of peeling horizontal steps, etc., resulting in a good embossed surface. A sheet is obtained.

[Brief explanation of the drawing]

1 and 2 are side views for explaining the present invention in detail. FIG. 3 is a side view for explaining the conventional method.

Claims (1)

[Scope of Claims] 1. When producing a sheet-like product having a embossed surface by heating and pressure embossing a sheet-like product having a smooth surface made of a polymer mainly composed of an elastic polymer, The surface-embossed sheet is brought into contact with the embossing roll by a guide roll provided in front of the heated embossing roll, and is preheated by moving at least 1/4 of the roll circumference along the roll,
A method for producing a good surface-embossed sheet, characterized in that the sheet is then pressurized and embossed using the embossing roll. 2. Pressure-emboss the sheet-like material with an embossing roll, and fix the stamped pattern by sticking it tightly to the embossing roll with self-adhesion.
The manufacturing method according to claim 1, wherein the film is peeled off at a natural peeling point. 3. Pressure-emboss the sheet material with an embossing roll, and fix the stamped pattern by sticking it tightly to the embossing roll with self-adhesion.
The manufacturing method according to claim 1, wherein a peeling roll is provided at the natural peeling point for peeling.