JPS6038276B2 - Light diffuse reflection sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet having a diffused reflection surface formed on one surface of a plastic film or sheet, and more specifically, the invention relates to a sheet having a diffused reflection surface formed on one surface of a plastic film or sheet. The purpose is to obtain a vapor-deposited sheet for diffusely reflecting light by continuously forming a diffusely reflecting film layer (matted layer) by roughening the surface, and then depositing a metal or the like on the diffusely reflecting film layer.

Conventional methods for forming a diffusely reflective film layer on one side of the largest substrate include, for example, dissolving a resin mixed with fine particles in a solvent, coating it by gravure coating, silk screen method, etc., and drying with heat to form a finely rough surface. A diffusely reflective film layer was formed.

However, in these conventional methods, the resin solution tends to adhere to the plate cylinder, causing plate clogging and screen clogging, making it impossible to obtain a uniform fine phase surface.Furthermore, the solvent remains in the product, which causes problems when processing the product. This method has the drawback of causing organic pollution to the surrounding area during the manufacture or use of the primary product, and the major drawback that it cannot be achieved with resins that do not dissolve in solvents.

Moreover, over time, the concentration of the resin dissolved in the solvent increases due to the dissipation of the solvent, making the concentration control extremely complicated and difficult, which is a drawback in this type of process. In addition, mechanical and physical methods such as sandblasting and embossing are also considered, but these methods require strict selection of the film material, and the film must be thicker than a certain level. There are drawbacks. Furthermore, there are other chemical methods such as etching, but these have the drawbacks that the selection of film material is difficult and cleaning and drying after processing is difficult. Furthermore, synthetic resin films are generally weak and when torn from a desired point, they run away in the tearing direction and wrinkle, making it difficult to cut.

In addition, general synthetic resin films are stretched to improve their physical properties, and biaxially stretched films in particular are used to strengthen their stiffness and improve their properties.
It has been designed to improve transparency, barrier properties, heat shrinkability, etc., and those that have been subjected to double-stretching are more difficult to tear than those that have not been stretched; Even if it tears, the direction of tearing is not constant because it is stretched in both axes.

In particular, the mechanical stability of polyester, polyolefin, etc.
Synthetic resin films with high dimensional stability cannot be cut by hand unless they are cut using a knife. This invention was made in order to eliminate all the various drawbacks of the above-mentioned conventional examples, and the first feature of this invention is that fine particles such as pigments, boron oxide, alkali salts, etc. are produced by extrusion method. To provide a light ray diffused reflection sheet characterized in that a mixed hot molten resin is solidified into a sheet shape through a cooling roll with a finely textured surface to form a light ray diffused reflection surface with a double microstructured surface. It is in.

The second feature of this invention is that
Using the John method, hot melt resin containing fine particles such as pigments, silicon oxide, and alkali salts is cooled to a finely roughened surface.

After the plastic sheet is solidified into a sheet through a roller, the surface of which has a light diffusing surface with a double finely assembled surface is obtained.This sheet is then stretched in the vertical and horizontal directions using a tender mechanism or the like, so that the surface becomes finely divided. An object of the present invention is to provide a light ray diffuse reflection sheet characterized by forming a light ray diffuse reflection surface with a heavy roughness. Furthermore, a third feature of the present invention is that, in addition to the first or second feature, a light ray diffuse reflection sheet can be easily torn by pasting paper on the diffuse reflection surface of the light ray diffuse reflection sheet. It is about providing.

The present invention will be described in detail below with reference to the illustrated embodiments.

In Fig. 1, A is a light-diffusion-reflecting surface B with a double micro-assembled surface using the present invention on one side of a plastic film or sheet made of polyolefins, polyvinyl chloride, polyester, etc. mixed with fine particles E, which will be described later. The formed product has a wall thickness of about 10 to 70 mm, so it is manufactured uniformly. Figure 2 shows an embodiment of the present invention, in which 1 is a hopper containing heat-meltable resins such as polyolefins and polyvinyl chloride mixed with ultrafine particles E such as pigments, silicon oxides, alkali salts, and titanium oxides. , has an input port la for pellets such as polyester.

2 heats and melts the resin pellet in an extruder, and
It is extruded and supplied to the die 3.

A molten resin curtain portion 4 is extruded from the long slit 3a of the T-die in the form of a film with a constant thickness and width. On the other hand, the light diffuse reflection sheet A shown in FIG. Cooling surface provided with ultra-fine roughness. Rule 8
is available. Then, by evenly dropping the molten resin curtain portion 4 between the surface of the pressure roll 6 and the cooling roll 8, the surface of the cooling roll 8, which has a very fine rough surface due to the fine particles E mixed in the molten resin, is A diffused reflection sheet A having a fine double phase surface B is produced by cooling and solidifying according to the fine roughness of the plastic film or sheet, and has a fine double phase surface B as shown in FIG. 3a. A sheet product 9 according to the present invention is obtained in which the light diffused reflection surface is beautifully formed by the fine double roughened surface B.

This sheet product 9 is a wrapping decorative paper, discharge recording paper, etc. with fine light diffused reflection that is unique to the present invention and which reflects incident light beautifully with a shining white appearance due to the double fine irregularities. Further, as an embodiment of the second feature of the present invention, the sheet A having the fine double-layered surface B is stretched in the longitudinal and lateral directions by a well-known means such as a tender method, so that even if the sheet is thin, it has a strong diffused reflection. A plastic sheet is obtained.

Furthermore, as a third characteristic embodiment of the present invention, a backing paper D is attached to the non-diffuse reflecting surface 9A of the light ray-diffusing reflecting plastic sheet product 9 by a well-known means such as adhesive, hot melt, laminating adhesive method, etc. , a light scattering reflection sheet that is easy to tear is obtained. In addition, if an extremely fine rough surface with an arcuate tip is formed on the surface of the cooling roll 8 and approximately spherical particles E of silicon oxide, alkali ± salts, etc. are used, the tip will have a circular tip as shown in FIG. 3b. It is possible to obtain a light ray diffused reflection film layer B having an arc-shaped fine double-layered surface.

As described above, according to the first embodiment of the present invention, a hot molten resin mixed with fine particles such as pigment, silicon oxide, alkali salt, etc. is cooled to a finely rough surface by the extrusion method. By solidifying into a sheet through a roll, the surface forms a light diffusing surface with a double micro-assembled surface, so compared to the conventional solvent-dissolved resin method, since no solvent is used, the visibility of the cooling roll is reduced. No clogging occurs.

In addition, according to the present invention, the surface of the cooling roll during the secondary plastic sheet film forming process is simply made into a finely roughened surface and no solvent is used, so there is no waste of resources due to solvent dissipation and no organic pollution to the surrounding area. . Moreover, in this invention, since it is possible to firmly form a double fine rough surface that reflects light diffusely by heating and melting the resin, it can be realized even with resins that do not dissolve in solvents, and there is no need to control the concentration of the melted resin, and the viscosity of the melted resin can be controlled by a microcomputer etc. It has a new and useful effect industrially in that it can automate the temperature and rotation speed of the cooling roll and the cooling roll under optimal conditions, allowing uniform products to be produced in large quantities at low cost. Furthermore, compared to mechanical methods such as sandblasting and embossing, the present invention has greater freedom in selecting the material and thickness of the film, allowing the use of inexpensive films, resulting in great economic effects. Furthermore, compared to chemical methods such as etching, it does not require energy, water, chemicals, etc. for cleaning, drying, etc., so it is economical and has the effect of saving energy and resources. Sheet product 9 according to the invention
Because of the double fine irregularities, the incident light is beautifully diffusely reflected with a shining white feeling, making it possible to obtain a unique fine-grained light diffused reflection wrapping decorative paper, etc., which has never been seen before. In addition, according to the second feature of the present invention, ``The extrusion method is used to melt hot molten resin mixed with fine particles such as pigments, oxidation elements, alkali salts, etc., so that the surface is finely roughened. After solidifying into a sheet using a cooling roll to obtain a plastic sheet having a light diffusing surface with a double fine-grained surface, this sheet is stretched vertically and horizontally using a tender mechanism or the like to form a fine double-grained surface. In addition to the above-mentioned effects, the synthetic resin film has improved physical properties, strengthened the stiffness of the sheet as a whole, improved transparency, improved barrier properties, and improved heat shrinkability, etc., by forming a light diffused reflection surface on the heavy assembly surface. A slightly rounded cut will not tear, but even if it tears, it will stretch in both axes, so the direction of the tear will be inconsistent and it will not be possible to cut it by hand unless it is cut with a knife.

Furthermore, according to an embodiment of the third feature of the present invention, in addition to the first or second feature, paper is pasted on the non-diffuse reflection surface of the light diffuser reflection sheet, so that the sheet as a whole becomes stiffer. When the material is torn from a desired point, the material can be cut without wrinkles escaping in the tearing direction, and it has the advantage that it can be easily torn from a desired point in a predetermined direction.

[Brief explanation of drawings]

The figures all show examples of the present invention; Fig. 1 is an enlarged sectional view of a light diffuse reflection sheet, Fig. 2 is a configuration diagram showing an embodiment of the invention, and Fig. 3a is an example of a product according to the invention. FIG. 3b is an enlarged sectional view of a modified example. A: Diffuse light reflecting sheet, B: Fine double-layered surface, D: hair cutting paper, E:
Fine particles, 1...hopper, la...
Inlet of pellet, 2... Extruder, 3... T-die, 3a... Slit, 4... Molten resin curtain part, 6
......pressure roll, 7...7 evacuation drum,
8... Cooling roll, 9... Sheet product. Figure 2 Figure 3 (A) Figure 3 Buddha)

Claims (1)

[Claims] 1. Solidifying a hot molten resin mixed with fine particles such as pigments, silicon oxide, alkaline earth salts, etc. into a sheet form through a cooling roll with a finely roughened surface by an extrusion method. A light ray diffuse reflection sheet is characterized in that the surface forms a light ray diffuse reflection surface with a double fine rough surface. 2. By using the extrusion method, hot molten resin mixed with fine particles such as pigments, silicon oxide, alkaline earth salts, etc. is solidified into a sheet form through a cooling roll with a finely roughened surface. A light ray diffuse reflection method characterized in that a plastic sheet having a light ray diffuse reflection surface with a finely rough surface is obtained, and then this sheet is stretched in the vertical and horizontal directions using a tender mechanism or the like to form a light ray diffuse reflection surface with a fine double rough surface. sheet. 3 In what is stated in claim 1 above,
A light ray diffuse reflection sheet made by pasting paper on the non-diffuse reflection surface of the light ray diffuse reflection sheet. 4. The light diffuser reflecting sheet according to claim 2, wherein paper is adhered to the non-diffusing reflective surface of the light diffuser reflecting sheet.