KR820002341B1 - Method for making a embossing roller for thermo-plastic - Google Patents

Abstract

The manufg. method of embossing roller used in processing sheet or film of thermoplastics such as PVC, was described. Polyorganosiloxane and crosslinking agent were coated and cured in the surface of the real thing, and then removed from the surface to give silicone elastomer having engrave, which was placed to the inside of cylinder at 5mm interval. Epoxy and dimethyleneamine were inserted to the space, cured, and then outer cylinder was removed to give epoxy cylinder having concrave, which was put to the inside of cylinder. Polyorganosiloxane and crossliking agent were packed to the space, cured and peeled.

Description

Manufacturing method of embossing roller for thermoplastic synthetic resin

The present invention relates to a method for producing an embossed roller effective for embossing a sheet or film of thermoplastic synthetic resin, in particular polyvinyl chloride (PVC).

As a constitution method of the embossing roller used in the conventional embossing process for thermoplastic synthetic resin, (1) engraving a predetermined concave-convex pattern directly on the surface of the cylindrical iron roller, and (2) the engraved roller of the silicone elastomer from the actual prototype such as leather There was a roller that was formed into a cylindrical shape.

For example, patent publications 72-195 or 81-1014 belong to this. In the conventional manufacturing method of the silicone elastomer embossing roller, a physical cylinder of woven fabric or leather is attached to the inner surface of the cylinder, and a small cylindrical roller is installed on the coaxial so as to maintain a constant distance therein, and then the outer cylinder and the inner Press and fill a mixture of liquid polyorganosiloxane, crosslinking agent and crosslinking accelerator in the space between the rollers (or cylinders) and cure for a certain time, then remove the physical circle attached to the outer cylinder and the inner surface of the cylinder to use the inner roller. In this case, the physical circle of one leather is wound on the outer side of the cylinder, and the liquid polyorganosiloxane, the crosslinking agent, and the crosslinking accelerator are mixed and applied and cured, and then the intaglio of the real body is inverted or cut off. Attach to the surface of the roller or to the inside of the cylinder so that the indented surface Small rollers are installed on the coaxial to maintain a constant gap, and the mixture of polyorganosiloxane, crosslinking agent and crosslinking accelerator is filled and cured between the outer cylinder and the inner small roller and then used to remove the outer cylinder.

However, the big defect of the embossed roller made of silicone elastomer layer manufactured in this way is that the actual circle such as one piece of leather must be cut into a cylinder of the required standard, so that the connection part remains.The rubber elasticity of the silicone elastomer Due to its physical properties, it is impossible to modify the joints. Therefore, when it is used for embossing of polyvinyl chloride, the joints are periodically reproduced on the embossed surface, which has been a major cause of deteriorating the product value. .

Accordingly, an object of the present invention is to provide a new embossing roller capable of completely eliminating the above-described defects.

The method of the present invention for achieving the object of the present invention is described in detail for each step as follows.

Step 1: According to a known method, a mixture of a polyorganosiloxane, a crosslinking agent and a crosslinking accelerator is applied to a surface of an actual circular shape having an uneven surface, and cured, followed by peeling, to obtain a negative silicone elastomer sheet. In the same way, after a predetermined number of sheets are manufactured, they are connected to each other, and the engraved parts are placed inwardly (in the radial direction) to the inside of the outer cylinder, and an iron roller is inserted into the cylinder, so that the interval between the inner and outer cylinders is constant ( About 5 mm).

Second step: A mixture of the epoxy resin and the plasticizer (70:30) prepared in advance in the above gap is injected and cured at 100 DEG C for 1 hour to obtain an embossed "epoxy resin roller". In this roller, the connection marks of the silicone elastomer described above are thoroughly corrected. At the end of the modification, the epoxy roller is used again as a core in another outer cylinder, and the mixture of polymethylsiloxane, the crosslinking agent and the crosslinking accelerator of the same component as in the first step in the gap (preferably kept at 5 mm). Inject it again to get the engraved "silicone elastomer tubing". Now there's no connection at all in this intaglio silicone elastomer. This silicone elastomer tubing can be demolded by dismantling the outer cylinder and peeling it from the inner cylinder.

Step 3: Insert the silicone elastomer tubing obtained in the second step into the inner surface of the outer cylinder with its engraved part facing outwards, and use the iron cylinder as the inner cylinder to cross the polyorganosiloxane, crosslinking agent and crosslinking again within the gap. Injecting and curing the accelerator mixture forms a silicone elastomer roller that is integrally bonded to the inner cylinder around the inner cylinder. There is no connection at all in this roller. This final roller becomes a silicone elastomer embossing roller without the connecting portion of the thermoplastic synthetic resin sought in the present invention.

When observing the original circular shape, for example, one natural leather, the size, depth, acute angle, gloss, and the like of the uneven pattern of the neck, the back, the belly, the legs, etc., are expressed differently in any animal skin. Therefore, in one leather, the part having the best left, right, top and bottom symmetry should be selected and cut. For example, in the case of the right skin, the range of about 10 cm x 6 cm is generally the same as that of the left and right, and the top and bottom unevenness is hard to be identified by the naked eye. Select such a part and use it as a manuscript.

As the types of the polyorganosiloxane, the crosslinking agent and the crosslinking accelerator which can be used, those described in the specification of the above-mentioned Patent Publication No. 81-1014 can be used. That is, polyorganosiloxanes include polydimethylsiloxane, polymethylphenysiloxane, polydivinylsiloxane, polymethylvinylsiloxane, polyfluoroalkylmethylsiloxane, or polycyanoalkylmethylsiloxane, of which polydimethylsiloxane is easy to obtain. As a crosslinking agent, organosilicon compounds, such as ethyl silicate and ethyl trimethoxysilane, organic peroxides, such as benzoyl perdoxy, t-butyl peracetate triisocyanate, etc. are mentioned. As a crosslinking promoter, organometallic compounds, such as dibutyl tin dilaurate, or carboxylate metal salts, such as calcium stearate and a carboxylate head, are mentioned.

The use of such silicone elastomer forming materials is known and does not fall within the scope of the present invention.

When the epoxy resin is cured, it is possible to cut or grind by engraving knife, sandpaper, etc., thereby making it easy to modify the connection part. Urethane resin or acrylic resin may be used instead of epoxy. Examples of the plasticizer that can be used when using an epoxy resin include ethylenediamine, diethylenetriamine, diethylaminopropylamine, dimethylaminomethylphenool, and the like, and the weight ratio thereof is most preferably 70:30. .

Hereinafter, the present invention will be described in detail by way of examples.

Example 1

A manuscript was prepared by cutting it into a size of 10 cm × 6 cm in consideration of the shape, size, and depth gloss of irregularities in the selected cowhide. Vacuum pump homogeneous mixture of polydimethylsiloxane 100gr with silane, 30 g of methyltrimethoxysilane, 30 g of ethyl silicate with an average particle diameter of 30 m / μ and a surface area of 110-150 m 2 / g and 10 g of dibutyltin laurate The bubble mixed at 60 mmHg was degassed for about 30 minutes using. The degassed liquid mixture was applied to the surface of the document at a thickness of 20 g / m 2 at room temperature for about 5 minutes, and the mixed air bubbles were removed by force after 30 minutes, and then cured for 24 hours to peel off the original to remove the negative silicone elastomer sheet. Got it. This process was repeated to obtain 250 identical silicone elastomer sheets. After the 250 sheets of silicon elastomer sheets were interconnected to each other, the intaglio portion was attached to the inside of a predetermined outer cylinder (inner circumference: 100 cm, width: 150 cm or less) in a radial direction.

Subsequently, an iron roller (outer circumference: 98 cm width: less than 150 cm or less) was placed inside the outer cylinder to maintain a distance of 5 mm between the two cylinders. Between these intervals, a homogeneous mixture of 7,000 g of epoxy resin and 3,000 g of dimethylene amine prepared in advance was injected and left to stand at 100 ° C. for 1 hour to cure. The entrained air was removed by the method described above. After cooling to room temperature, the outer cylinder is removed and an embossed epoxy resin roller is formed. After making sufficient modifications to the connections found in this roller, the epoxy roller is obtained in another outer cylinder. After sufficient modification is made to the joints found in this roller, the epoxy roller is placed in another outer cylinder to maintain the spacing at 5 mm, at which point 7,000 g of polymethylsiloxane and 300 g of methyltrimethoxysilane are again mentioned. A homogeneous mixture of 300 g of ethyl silicate and 100 g of dibutyltinlaurate is injected, cured, and then inverted to peel to obtain a negative silicone elastomer tubing.

This silicone elastomer tubing is again attached to the inner surface of the other outer cylinder with its engraved part facing outward, and the steel cylinder is inserted in the center, keeping the gap at 5 mm, and again the same elastomer molding compound as used in the first step Is injected and cured to obtain an intaglio silicone elastomer roller layer integrally bonded around the steel cylinder.

Example 2

The surface temperature of the woven polyvinyl chloride (PVC) sheet (or foam sheet) is heated to 200 ° C. to be in a molten state, and the molten PVC sheet is an intaglio silicone elastomer embossing roller prepared in Example 1. After passing through the pressure roller, and then through the cooling drum of 80 ℃. As a result, it was possible to obtain a surface in which delicate leather shapes and pores, acute angles and gloss were completely reproduced without the same connection part as the original leather pattern.

Claims (1)

In manufacturing a synthetic resin embossed roller, a known first step of applying and curing a polyorganosiloxane, a crosslinking agent and a crosslinking accelerator mixture on a physical circular surface and then peeling off to obtain a negative silicone elastomer sheet, and the silicone elastomer sheet is externally It is attached to the inner surface of the cylinder, and the epoxy resin roller is injected by injecting the epoxy resin and the crosslinking agent mixture at the interval between the inner cylinder of the steel, and then the silicone elastomer sheet joints on the both sides are thoroughly modified and erased. A second silicone resin tubing having an epoxy resin roller as an inner cylinder and injecting a polyorganosiloxane, crosslinking agent and crosslinking accelerator mixture according to the first step within the interval between the other outer cylinders to obtain a completely modified intaglio silicone elastomer tube Intaglio silicide obtained in the process and this second process A mixture of polyorganosiloxanes, crosslinking agents and crosslinking accelerators having the composition used in the first step within the gap, wherein the elastomeric tube is bonded to the inner surface of the outer cylinder so that the intaglio is directed outward, and the steel cylinder is the inner cylinder. A method of manufacturing an embossed roller for thermoplastic synthetic resin comprising a combination in a third step of obtaining an intaglio silicone elastomer resin layer integrally bonded to the steel inner cylinder by injection curing.