JPS6140188B2 - - 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, sheet, etc., and more specifically relates to a surface of a cooling roll for cooling and solidifying hot molten resin by an extrusion method. The aim 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 surface of a long substrate include, for example, dissolving a resin mixed with fine particles in a solvent, applying the coating using a gravure coating method, a silk screen method, etc., and drying with heat to form a fine-grained layer. A diffusely reflective film layer was formed on the surface.

However, in these conventional methods, the resin solution tends to adhere to the plate cylinder, causing clogging of the plate cylinder and screen, making it impossible to obtain a uniform finely roughened surface.Moreover, solvent remains on the product, making it difficult to process the product. They have the disadvantage of causing organic pollution to the surrounding area during the production or use of secondary products, and the major disadvantage of not being able to achieve this with resins that do not dissolve in solvents.

Another disadvantage is that the concentration of the resin dissolved in the solvent increases over time due to the dissipation of the solvent, making concentration control extremely complicated and difficult, which has become a bottleneck 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 location, they run away in the tearing direction and wrinkle, making it difficult to cut.

In addition, synthetic resin films are generally stretched to improve their physical properties, and biaxially stretched films in particular are used to strengthen stiffness, improve transparency, and improve barrier properties.
The heat shrinkability has been improved, and those that have undergone biaxial stretching are even more difficult to tear than those that have not been stretched, and will not tear even with a slight cut.
Even if it tears, the direction of tearing is not constant because it is stretched in both axes. In particular, synthetic resin films with high mechanical stability and dimensional stability, such as polyester and polyolefin, 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 conventional example, and the first aspect of this invention is
The feature of this product is that it uses an extrusion method to solidify hot molten resin mixed with fine particles such as pigments, silicon oxide, and alkaline earth salts into a sheet form through a cooling roll with a finely roughened surface. After obtaining a plastic sheet having a light diffusely reflecting surface with a double rough surface, a light diffusely reflecting vapor deposited film with a fine double rough surface is formed on the light diffusely reflecting surface of this sheet. The purpose of the present invention is to provide a vapor-deposited sheet that diffusely reflects light rays.

The second feature of this invention is that the extrusion method is used to heat molten resin mixed with fine particles such as pigments, silicon oxide, alkaline earth salts, etc. through a cooling roll with a finely rough surface. By solidifying it into a sheet, a plastic sheet having a light ray diffused reflection surface with a double fine rough surface is obtained, and then this sheet is stretched vertically and horizontally using a tender mechanism etc. to form a plastic sheet with a double fine rough surface. Forms a diffused reflection surface,
Next, an object of the present invention is to provide a vapor-deposited light-diffuse-reflecting sheet, characterized in that a light-diffuse-reflective vapor-deposited film having a fine double rough surface is formed on the light-diffuse reflection surface of the sheet.

Furthermore, the third feature of this invention is that
In addition to the first or second feature, it is an object of the present invention to provide a vapor-deposited sheet for diffusely reflecting light, which is made easy to tear by pasting paper on the non-vapor-deposited surface of the vapor-deposited sheet for diffusely reflecting light.

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

In Fig. 1, A is a plastic film or sheet made of polyolefin, polyvinyl chloride, polyester, etc. mixed with fine particles E, which will be described later, and the present invention is used to form a light-diffusion-reflecting surface B with a double fine rough surface. The wall thickness is approximately 10 to 70 μm, and the product is uniform.

FIG. 2 shows an embodiment of this invention, in which 1
is a hopper for pigments, silicon oxides, alkaline earths,
It has an input port 1a for pellets of heat-meltable resin such as polyolefins, polyvinyl chloride, polyester, etc., mixed with ultrafine particles E such as salt and titanium oxide.

2 heat and melt the resin pellets in an extruder,
It is extruded and supplied to the T-die 3 in the lower stage. A molten resin curtain portion 4 is extruded from the elongated slit 3a of the T-die 3 into a film shape with a constant thickness and width.

On the other hand, the light scattering reflection sheet A shown in FIG. A cooling roll 8 having an extremely finely roughened surface is provided.

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 It is cooled and solidified according to the finely roughened surface, and is further roughened to obtain a diffused reflection sheet A having a fine double roughened surface B. Next, when a metal such as aluminum is deposited on the finely roughened surface B by a conventionally known deposition method, a metal deposited film having a uniform average thickness (400 to 2000 Å) is formed as shown in FIG. A sheet product 9 according to the present invention is obtained in which a metal vapor deposition film C that reflects light rays is beautifully formed on a diffusely reflective surface formed by the fine double roughness surface B of a film or sheet.

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 of the metal vapor deposited film C.

Further, as an embodiment of the second feature according to the present invention, the sheet A having the fine double rough surface B is stretched in the vertical and horizontal directions by a well-known means such as a tender method, and then a metal is placed on the rough surface B. Since it is vapor-deposited, it is possible to obtain a strong light diffused reflection sheet even if it is thin.

Furthermore, as a third characteristic embodiment of the present invention, a backing paper D is attached to the non-vaporized surface 9A of the vapor-deposited sheet product 9 for diffused reflection of light rays by a well-known means such as adhesive, hot melt, or lamination bonding method. , a light scattering reflection sheet that is easy to tear is obtained.

In order to use this invention as a discharge recording paper, the plastic sheet A or the backing paper D may be colored, or a colored layer may be formed between the sheet A and the paper D.

In addition, if an extremely fine rough surface with an arcuate tip is formed on the surface of the cooling roll 8, and the fine particles E of silicon oxide, alkaline earth salt, etc. are approximately spherical, the tip will be formed as shown in FIG. 3b. A light ray diffuse reflection vapor deposited film C having an arcuate fine double rough surface can be obtained.

As described above, according to the embodiment which is the first characteristic of the present invention, a hot melt resin containing fine particles such as pigment, silicon oxide, alkaline earth salt, etc. After solidifying into a sheet through a surface cooling roll, a plastic sheet having a double-roughened light-diffusing surface is obtained. Since a vapor-deposited film with diffused light reflection is formed, no solvent is used, compared to the conventional solvent-dissolved resin method, so clogging of the cooling roll does not occur.

In addition, according to the present invention, the surface of the cooling roll used in the conventional plastic sheet film forming process is only made finely rough and no solvent is used, so there is no wastage 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 allows 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. The sheet product 9 according to the present invention is a packaging decorative paper, discharge recording paper, etc., which exhibits a fine diffused reflection of light that is unique to this invention and which is unique to the present invention, in which the incident light is beautifully diffusely reflected with a white shining feeling due to the vapor deposited film having double fine irregularities. It will be done.

In addition, according to an embodiment of the second feature of the present invention, a hot melt resin mixed with fine particles such as pigment, silicon oxide, alkaline earth salt, etc. is processed by an extrusion method to have a finely roughened surface. The plastic sheet is solidified into a sheet form through a cooling roll to obtain a plastic sheet with a double-fine rough surface and a diffusely reflective surface.The sheet is then stretched vertically and horizontally using a tender mechanism or the like to form a surface with a fine surface. A double-roughened light-diffusing-reflecting surface was formed, and then a light-diffusing-reflecting vapor deposited film with a fine double-roughened surface was formed on the light-diffusing reflecting surface of this sheet, so in addition to the above-mentioned effects, the synthetic resin film also had physical properties. In addition, the sheet as a whole has been strengthened, has improved transparency, improved barrier properties, and improved heat shrinkability, and even if it is torn, it will not tear because it is stretched in both axes. It has the effect that the direction is not constant and it is impossible to cut by hand unless it is cut using 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 attached to the non-vaporized surface of the vapor-deposited surface of the diffused light reflection vapor-deposited sheet, so that the sheet as a whole has a stiff body. It becomes strong, and when it is torn from a desired point, it does not run away in the tearing direction and wrinkle, and when it is cut, it can be easily torn from a desired point in a predetermined direction.

[Brief explanation of the drawing]

Each figure shows an embodiment of this 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 present invention, Fig. 3a is an enlarged sectional view showing an example of a product according to the invention, and Fig. 3b is a modified example. FIG. A...Diffuse light reflection sheet, B...Fine double rough surface, C...Diffuse light reflection vapor deposited film, D...Backing paper,
1... Hopper, E... Fine particles, 1a... Pellet inlet, 2... Extruder, 3... T-die, 3
a... Slit, 4... Molten resin curtain part, 6
...Pressure roll, 7...Take-up drum, 8
...Cooling roll, 9...Sheet product.

Claims (1)

[Claims] 1. Solidifying a hot molten resin mixed with fine particles such as pigments, silicon oxide, and alkaline earth salts into a sheet through a cooling roll with a finely roughened surface using an extrusion method. After obtaining a plastic sheet with a double rough surface and a diffusely reflecting surface,
A vapor-deposited light-diffuse-reflecting sheet, characterized in that a light-diffuse-reflective vapor-deposited film having a fine double rough surface is formed on the light-diffuse reflection surface of the sheet. 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. After obtaining a plastic sheet having a light ray diffused reflection surface with a finely rough surface, this sheet is stretched in the vertical and horizontal directions using a tender mechanism or the like to form a light ray diffused reflection surface with a fine double rough surface. A vapor-deposited sheet for diffusely reflecting light, characterized in that a vapor-deposited film for diffusely reflecting light having a fine double rough surface is formed on a diffusely reflecting surface. 3. A vapor-deposited sheet for diffusely reflecting light rays as set forth in claim 1 or 2, which is formed by pasting paper on the non-vapor-deposited surface of the vapor-deposited surface for diffusely reflecting light rays.