JPS63168328A - Silicone rubber belt for embossing and method for embossing - Google Patents

Abstract

PURPOSE:To obtain an emboss belt, onto which the surface pattern of an original material in continuous form is embossed as it is, by a structure wherein an emboss belt is a flat silicon rubber, plate, on one side of which reinforcing material is mounted and non the other side of which an irregular pattern of the original material is embossed. CONSTITUTION:An original material 1 is drawn out under the state that the surface having irregular pattern to be reproduced faces upwards so as to be coated with silicon rubber 3 on a roll 2. A reinforcing material 4 such as woven fabric, nonwoven fabric, paper, plastic film, metal foil or the like, which is prepared separately, is fed to be laminated onto the silicon rubber 3 of the original material 1, the irregular pattern surface of which is coated with silicone rubber 3. The original material 1, the irregular pattern surface of which is coated with the silicon rubber 3 having the reinforcing material 4 laminated on its top surface, is stationed in a cure zone 5. When the curing of the silicone rubber 3 is completed in the cure zone 5, the silicon rubber 3 and the reinforcing material 4 are delaminated from the original material 1 so as to peel off, an emboss belt 6, on the silicon rubber 3 of which the irregular pattern of the original material 1 is faithfully embossed in order to obtain an emboss belt by winding up them separately.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a silicone pelt for embossing for molding an uneven pattern of a raw material onto a long material to be molded;
The present invention relates to an embossing method using this embossing silicone belt.

(Prior art) For example, when it is desired to imprint a certain uneven pattern on a thermoplastic resin sheet, the uneven pattern is engraved on the circumferential surface of a metal roll, and this is used to imprint the uneven pattern on the roll surface. It is well known that this happens. The resulting uneven pattern is limited to the range that can be engraved on the metal hole, and the resulting uneven pattern is also the result of pressure bonding between the metal roll and the thermoplastic resin sheet. It was uneven.

Therefore, the present inventors believe that when molding a final product by means such as engraving, only an uneven pattern within an extremely narrow range can be reproduced on the final product. Research was being carried out with the goal of imprinting the uneven surface pattern of knitted fabrics etc. onto the final product, but in this process, silicone rubber, which is used to reproduce works of art, was used to reproduce extremely fine uneven patterns. We learned that the molded material is preferable as a material, and conducted research on using it for engraving. An example of this silicone rubber is what is called RTV silicone rubber, and this RTV stands for R.
OOM TENPERATURg VALC! -AN
It is an acronym for ISING and is a room temperature curing silicone rubber. Using this TV silicone rubber, the present inventors first conducted an Engesroll method in order to obtain a synthetic sheet that faithfully reproduces the surface pattern of, for example, a certain textile. In this method, a fabric having a surface pattern to be reproduced is wound around a roll with the surface pattern to be reproduced facing up, and the seams are joined. Next, RTV silicone rubber is applied to the surface of the wrapped fabric to an appropriate thickness, and when the cylindrical RTV silicone rubber is pulled out from the roll after it has completely cured, the inner circumferential surface of the tube is coated with the fabric. The surface pattern is embossed. Therefore, when this RTV silicone rubber tube is turned over, it becomes a tube with the surface pattern of the fabric embossed on the outer circumferential surface of the tube.This tube is fitted into a roll and engaged in the same manner as a conventional engagement roll. It is.

(Problem to be Solved by the Invention) This method, that is, molding the final product using RTV silicone rubber by roll method, is not suitable for RT.
By using silicone rubber, for example V silicone rubber, it has been extremely satisfactory to reproduce the uneven pattern of the raw material in the final product, but there are still issues that must be overcome in order to put it into practical use. Difficulties were discovered.

This is a matter related to the joints of raw materials. As mentioned earlier, when applying silicone rubber to the surface of the raw material, since the raw material is wrapped around a roll, it is natural that silicone rubber is also applied to the joints of the raw material on the roll. However, when the silicone rubber hardens, this seam will be clearly patterned, and if this is used for engessing with a roll method, the seam will be clearly patterned in the final product with each rotation of this roll. The Rukoto. The good thing about silicone rubber is that it clearly and faithfully reproduces minute uneven patterns, but even if the other parts of the raw material meet expectations, the seams are expressed as a defect. be. Most of the rolls used for Enges have a diameter of several tens of centimeters.
Since none of them exceeds 1 meter in length, the joints often appear in short lengths. The same thing also occurs when the concavo-convex pattern of the raw material is made continuous. For example, when the uneven pattern on the raw material is a repeating pattern, it is fine if the pattern is well connected at the seam, but if it is not, the pattern will not connect at the seam and will appear as a pattern part that is aesthetically undesirable. It will come.

(Means for Solving the Problems) In view of the progress of these studies, the present inventors used silicone rubber to make a mold from the raw material and when molding it to the final product, the joints or patterns were removed. As a result of various studies and various experiments aimed at making it possible to perform discontinuities to the extent that there is almost no problem in practical use, we have found that (1) a flat plate made of silicone rubber; A silicone rubber belt for embossing (2), which has a reinforcing material on one side and a concave-convex pattern on the other side, which has a concavo-convex pattern on the raw material. Using a molding material and an endless silicone rubber belt for embossing, which is an endless silicone rubber belt for embossing in which the uneven pattern of the raw material is molded on the silicone rubber layer, the thermoplastic synthetic resin layer of the bamboo material to be molded is molded. The uneven pattern surface of the silicone rubber layer of the endless embossing silicone rubber belt is softened by heating, and then heated to a temperature that is lower than the softening temperature of the resin of the thermoplastic synthetic resin layer of the molding material. The thermoplastic resin layer of the material to be molded and the softened material is crimped and bonded while the machine is running together with the machine.
After molding the uneven pattern of the silicone rubber belt for endless embossing on the thermoplastic synthetic resin layer of the material to be molded, the silicone belt for endless embossing is peeled off from the material to be molded, and the silicone rubber belt for endless embossing is circulated endlessly. By using an embossing method in which the concavo-convex pattern on the silicone rubber belt for endless embossing is imprinted on the material to be molded by pressure bonding with the material to be molded, the object can be well achieved, and the present invention has been obtained. It is.

i'・' (For work 1.1..+,') The first invention, the silicone belt for embossing (hereinafter simply referred to as the embossing belt), can be made as long as you like, so even if it is 60 m. Since it is possible to imprint the surface pattern of a long raw material, such as a textile, as it is, the seams will appear every 10111 times.

When the seams that appear at such long intervals become a product,
Since it only appears in a very small number of products, it poses no practical problem, and therefore there is no need for seam correction.

Also, is this the first invention/7+? The second invention, the embossing method, uses an embossing belt, and since the crimping time between the embossing belt and the material to be molded is extremely long, it is possible to imprint an uneven pattern on the main valve. In the case of using an embossing roll, the embossing roll and the material to be molded are crimped and bonded by line contact, so that the embossing was inevitably insufficient.

(!!Example) To explain the present invention in more detail with reference to the attached drawings, Figure 1 is a process diagram showing an example of a method for obtaining an embossed belt according to the first invention.First, the uneven pattern to be reproduced is Prepare the raw material 1, which should be rolled up properly.This raw material 1 is placed on a drawer roll 2 with the uneven pattern surface to be replicated facing up, and then rolled with silicone rubber 3. A separately prepared auxiliary material 4 such as woven fabric, non-woven fabric, paper, glass film metal foil, etc. is applied onto the silicone rubber 3 of the raw material 1 whose uneven pattern surface is coated with silicone rubber 3. The silicone rubber 3 is applied to the uneven pattern surface of the raw material 1, and the auxiliary material 4 is laminated on the upper surface of the raw material 1. Although not shown, the raw material 1 is set in a pinch/tar and placed in a cure zone 5. It is left still inside.

When the curing of the silicone rubber 3 is completed in this cure zone 5, the silicone rubber 3 and the reinforcing material 4 are laminated from the raw material 1, and the silicone rubber 3 faithfully molds the uneven pattern of the raw material 1. An embossed belt is obtained by peeling off the embossed belt 6 and winding each part separately.

Separately, silicone rubber was applied to the uneven patterned surface of the raw material spread out on the workbench, and a reinforcing material was layered on top of that, and the material was placed in a cure zone to wait until curing was complete. It is also possible to obtain an embossed belt by waiting and then peeling off the raw material.

<Example 1> Nylon woven fabric (warp 420 D, weft 42
0D, plain weave with a density of 50 warps/inch and a weft of 40 threads/inch), and a mixture of equal amounts of Shin-Etsu Silicon KE1603A and Shin-Etsu Silicon KE1603B was used as the silicone rubber for forming the uneven pattern to be applied to the uneven pattern surface. (Shin-Etsu Silicone KB1603A and 1603B are two-component RTV silicone rubber manufactured by Shin-Etsu Silicone Co., Ltd.) Apply at 500 f/d using a doctor knife.

After this silicone rubber for forming an uneven pattern is applied, a sfumos (muslin made of spun rayon yarn) made of spun rayon yarn of No. 30 for both the warp and weft is applied to the coated surface.
Laminate as a reinforcing material. This laminated material is set in a pinch/tar and placed in the Cure Zone → treatment.8 This process increases the cure zone to 15
Heat at 0°C for 30 minutes, then lower the temperature to 20°C over 1 hour, and leave at 20±5°C for 24 hours. This completes the curing power of the silicone rubber, so wait for this curing to complete.
The raw material, iron woven fabric, is peeled off, and silicone rubber and
An embossed belt consisting of sfumos laminated thereon was obtained. On this embossed belt, the uneven pattern on the surface of the nylon woven fabric, which is the raw material, was clearly transferred over a long length with a high degree of fidelity.

Next, as shown in FIG. 2, using the embossed belt obtained according to the first invention described above, the patterned material (the uneven pattern of the raw material is finally embossed by the embossed belt) The method of imprinting the uneven pattern of an embossed belt on a long sheet or belt having the same uneven pattern on its surface will be explained. In FIG. 2, 21 is a material to be molded, which is a long film, sheet, etc.
It consists of something like a belt. When this molding material 21 is made of a single material, it is made of thermoplastic synthetic resin, but 2
In the case of two or more layers, the layer on which the uneven pattern is to be imprinted, that is, the outermost layer, is made of thermoplastic synthetic resin.

While the molded material 21 is pulled out and passed over the rolls 22, it is heated by a heat source 23 and the thermoplastic resin layer is softened. On the other hand, the engagement belt 6 obtained according to the first invention is joined at both ends to a silicone belt 26 for endless engagement (hereinafter simply referred to as an endless engagement belt) rolls 24, 24', 24'.
, 24"' to perform an endless circulation movement. The outside of this endless embossed belt 26 is a surface with an uneven pattern formed of silicone rubber. The molding material 21 has a softened thermoplastic resin layer. The endless engagement belt 2 is performing endless circulation motion at the position of the roll 25.
6 and are pressed and bonded between the rolls 25 and 24. At this time, the temperature of the silicone rubber of the endless engagement belt is lower than the repulsion temperature of the thermoplastic synthetic resin of the material to be molded. The pressure bonding between the two continues up to the position of the roll 24'', and during this time a sufficient uneven pattern is formed between the two.The material 21 to be patterned is wound as a product 27, while the endless embossed belt 2 circulates and encounters a new part of the molding material 21,
Crimp and join and mold. As a result, if the endless embossed belt 26 (7) has a total length of 75E10 m, the seam appearing in the product 27 can be seen once in lQm,
If it is 50rrL, the seam can only be seen once every 50m.

This embossing method was explained in the case where the material to be embossed was already formed into a sheet, belt, etc.
A thermoplastic synthetic resin is applied as a molding material to the uneven patterned surface of the Enges belt obtained by the invention, and then,
A product can also be obtained by peeling the cured and molded thermoplastic synthetic resin from the Enges belt.

(Example 1) The embossed belt obtained in Example 1 of the first invention was used as the embossed belt obtained in the first invention, and the embossed belt was cut into a length of 20 m and both ends were joined to form an endless enges belt. And so.

On the other hand, the molding material to be used as a product consists of three layers: a base fabric, a soft vinyl chloride foam layer on top of the base fabric, and an outermost soft vinyl chloride layer (non-foamed, foamed). It is the outermost layer, the soft vinyl chloride layer (non-foamed), that transfers the uneven pattern to the molding material. The compositions of the soft vinyl chloride layer, the soft vinyl chloride foam layer, and the base fabric that constitute this molded material are as follows.

Soft vinyl chloride layer Polyvinyl chloride (p=1450) 100 parts DoP
60 parts TSA-Zn stabilizer 3 parts epoxidized dog oil
Bipartite titanium oxide 1
0 parts Soft vinyl chloride foam layer Polyvinyl chloride (p=1450) 100 parts Dop 60 parts Foaming agent
Azoshika-boamite 3 part 13a-Zn
System stabilizer 3-part titanium oxide
109 cloth blended yarn of polyester and rayon (blending rate 509)
Woven fabric with warp (No. 30, density 45 pieces/inch) and weft (No. 30, density 45 pieces/inch) on this base fabric, the composition that will become the above-mentioned soft vinyl chloride foam layer is calendered to 0.30 After coating it to a thickness of 0.1 fi, the composition that is to become a soft vinyl chloride layer is applied on top of this using a calendar to a thickness of 0.1 fi, and this is heated in an oven at 200°C for 1 minute to foam. A material to be molded was obtained by foaming the agent to form a soft vinyl chloride foam layer with 0 and 6 fins approximately twice as thick.

Using these molding materials and an endless engagement belt, pressure-N bonding was carried out according to the process shown in FIG. 2, and molding was performed to obtain a product. At this time, the heating temperature to soften the polyvinyl chloride layer was 180°C, and the temperature was adjusted to 80°C when the endless embossed belt was brought into contact with the molding material at a pressure of 8 m. The speed of the endless embossed belt was 10 m and 7 minutes.

The seams of the uneven pattern in the product obtained by this are 2
Although this seam appeared once every 0 m, this product was previously cut into pieces and made into bags, etc., so the seam that appeared once every 20 m was not a major problem.

Many raw materials are suitable for the first invention, but among them, woven fabrics, knitted fabrics, natural leather, various synthetic resin processed products, metals, resin-impregnated fabrics, paper, non-woven fabrics, etc. is suitable, but silicone rubber with poor mold release properties, vl
For example, porous materials and highly absorbent materials are not preferred.

Also, any type of silicone may be used, but
Among them, two-component RTV silicone rubber is the most suitable from the viewpoint of mold releasability from the raw material. As for the crosslinking method, both addition type and condensation type are suitable. Then, to obtain practical performance as an embossed belt, crosslinking is performed.

Rubber hardness is % JIS hardness of 401 to 85 degrees.
If it is softer than 40 degrees (JISK 2808), the durability of the uneven pattern will be poor and it will not be able to withstand repeated use. It becomes difficult to mold a sharp uneven pattern onto the resin. To apply silicone rubber to the uneven pattern of the raw material, it is preferable to perform doctor knife coating, reverse roll coating, kiss coating, etc.

When using a two-component R,TV/IJ rubber, a doctor knife coating is most desirable since this silicone rubber usually has a high viscosity exceeding to, ooocps. Furthermore, woven fabric is used as a reinforcing material.

Non-woven fabric, paper, plastic film, f-last snack sheet are used, and primer treatment is preferable to increase adhesion to silicone rubber, but if silicone rubber penetrates and adhesive strength can be expected due to physical entanglement, then No primer treatment is required.

(Effects of the Invention) As described above in detail, in the first invention, a long raw material having a concavo-convex pattern is reproduced in a long state with a concave-convex pattern. Apply silicone rubber to the surface,
This is combined with a reinforcing material and after the silicone rubber has hardened, the raw material is peeled off to create an embossed belt.This embossed belt can be made into any length of embossed belt, and when the pattern becomes continuous. , in the conventional drum format, 1
-'A seam appears every time the ram rotates, and mismatched pattern parts appear because the pattern is not continuous at the seam, and it is difficult to correct this.
This had a significant impact on the manufacturing cost of the final product, but with the present invention, no matter how long the pattern was, it could be stamped on the Engos belt. , which causes seams to appear on the product.

Since the length of the embossed belt can be freely determined, there is no need for work such as seam correction, which can significantly reduce the manufacturing cost of the final product. Furthermore, in the second invention, the embossed belt is an endless enges belt, and the uneven pattern is embossed on the material to be embossed.
Due to circulation, only the CI joint and the pattern mismatch at the joint occur, and the pattern appears after a much longer period of time compared to the conventional appearance of once per rotation of the drum. Therefore, the effect on the product is small, and the time it takes to pressure-bond the Shikamoni/Dress Enzes belt and the molding material and mold the uneven pattern is short.

In the conventional drum type, the line contact takes only one moment, but in the present invention, the endless engos belt and the material to be molded are pressed together on their surfaces, and that time is extremely long. Therefore, molding can be done with sufficient accuracy, and the quality of the product can be extremely high.The molding of uneven patterns that already exist using silicone rubber cannot be put to practical use until it is produced. This is an extremely noteworthy invention that has significantly expanded the range of products of this type and made it possible to obtain high-quality products.

[Brief explanation of the drawing]

The attached drawings are for explaining the present invention, and FIG.
FIG. 2 is a process diagram showing an example of the process of manufacturing an engosu belt according to the invention of the invention, and FIG. FIG. 3 is a process diagram showing an example. 1: Raw material, 3: Silicone rubber, 4: Reinforcement material, 6: Silicone belt for Enzes, 21: Corrugated attachment material H, 26: IJ Core Held for Endless Engoss,

Claims (2)

[Claims] (1) A silicone rubber belt for embossing, which is a flat plate made of silicone rubber, having a reinforcing material on one side and an uneven pattern surface on the other side on which the uneven pattern of the raw material is embossed. (2) A long mold having at least a thermoplastic synthetic resin layer on the outermost layer is made of a material, and an endless silicone rubber belt for embossing, which is an endless silicone rubber belt for embossing with an uneven pattern of the raw material imprinted on the silicone rubber layer. A silicone rubber belt for endless embossing, wherein the thermoplastic synthetic resin layer of the molding material is heated and softened, and then the temperature is lower than the softening temperature of the resin of the thermoplastic synthetic resin layer of the molding material. While the textured surface of the silicone rubber layer and the thermoplastic synthetic resin layer of the molded material softened by heating are running together while being pressure-bonded, the thermoplastic synthetic resin layer of the molded material is heated and softened. After molding the uneven pattern on the silicone rubber belt for endless embossing, the silicone rubber belt for endless embossing is peeled off from the material to be molded.
An embossing method characterized in that a silicone rubber belt for endless embossing is endlessly circulated and crimped and bonded to a material to be molded, thereby imprinting the uneven pattern on the silicone rubber belt for endless embossing onto the material to be molded.