JPS6147703B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of forming a light ray diffusely reflecting film layer (matting layer) on one side of a long base material such as a plastic film or paper, and more specifically, it relates to a method for forming a light ray diffusely reflecting film layer (matting layer) on one side of a long base material such as a plastic film or paper. By roughening the surface of the cooling roll for cooling and solidifying the hot molten resin containing fine particles of silicon oxide, alkaline earth, etc. attached to the surface of the base material by the John lamination method, fine double layers are formed on the base material. The present invention relates to a method of continuously forming a rough reflective film layer (matte layer).

Conventional methods for forming a diffusely reflective film layer on one side of a long base material include dissolving the resin (vehicle) in a solvent, applying it using a gravure coating method, silk screen method, etc., and drying with heat to form a diffusely reflective film layer on a finely rough surface. It formed a layer.

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.
Another disadvantage is that the solvent remains in the product and causes organic pollution to the surrounding area during processing, manufacturing or use of secondary products, and the other major disadvantage is that this cannot be achieved with resins (vehicles) that do not dissolve in solvents. It was hot. 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.

This invention was made in order to eliminate all the various drawbacks of the above-mentioned conventional examples, and its feature is that silicon oxide or alkali is coated on one side of a base material such as a plastic film or paper by an extrusion lamination method. A method of forming a light ray diffused reflection film layer with a fine double rough surface on one side of the base material by applying a hot melt resin mixed with fine particles such as earth through a cooling roll with a fine rough surface. Our goal is to provide the following.

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

In FIG. 1, A is a long base material such as a plastic film made of polypropylene or polyester, or paper, and the thickness thereof is approximately 8 to 200 μm and is uniformly manufactured into a product.

FIG. 2 shows an embodiment of this invention, in which 1
The hopper is a hopper and has an inlet 1a for feeding pellets of heat-meltable resin such as polypropylene or polyester containing ultrafine particles D of silicon oxide, alkaline earth metal, titanium oxide, etc. Reference numeral 2 is an extruder which heats and melts the resin pellets and presses and supplies the resin pellets to the lower T-die 3. 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 structure is such that the base material A drawn from the supply drum 5 on which the base material A shown in FIG. A cooling roll 8 having a very finely roughened surface is provided so as to be in rolling contact with the surface of the elongated base material A that is fed in close contact with the surface of the pressure roll 6 at a predetermined pressure.

Further, the base material A on which the molten resin curtain portion 4 moves on the surface of the pressure roll 6 at a predetermined speed in the direction of the arrow.
By allowing the molten resin to fall evenly between the surface of the substrate A and the cooling roll 8, the surface of the molten resin attached to one side of the base material A that has passed through the pressure roll 6 is cooled and solidified according to the fine roughness of the cooling roll 8. In combination with the mixture of fine particles D, a diffusely reflective film layer (matte layer) C having a fine double rough surface B is formed with a uniform average thickness (10 to 20 μm) as shown in FIG.
A product 9 according to the present invention is obtained in which a diffusely reflective film layer (matte layer) B is beautifully formed on one surface of a base material A such as a film or paper as shown in FIG. It will be done.

This product 9 can be used, for example, as a tracing film or a plastic sheet for offset printing, and has a wide range of applications.

In addition, if an extremely fine roughened surface with an arcuate tip is formed on the surface of the cooling roll 8 and the fine particles of silicon oxide, alkaline earth, etc. are used in a substantially spherical shape, the tip will have an arcuate tip as shown in FIG. 4b. A light ray diffused reflection film layer B having a fine double rough surface can be obtained.

As described above, according to the present invention, an extract can be applied to one side of a base material such as a plastic film or paper.
By applying hot molten resin mixed with fine particles such as silicon oxide and alkaline earth metal through a cooling roll with a finely rough surface using the John lamination method,
Since an effective ray diffused reflection film layer with a fine double rough surface is formed on one side of the base material, no solvent is used compared to the conventional solvent-melted resin method, so there is no clogging of the cooling roll. Moreover, no uneven coating occurs.

In addition, according to the present invention, since no solvent is used, there is no waste of resources due to solvent dissipation and no organic pollution to the surrounding area. Moreover, in this invention, a double rough reflection surface made of heated and molten resin can be firmly adhered to the base material, making it possible to achieve extremely beautiful diffused reflection.Furthermore, it can be achieved using a resin that does not dissolve in solvents, and the concentration of the molten resin can be controlled. This method has new and useful industrial effects, such as eliminating the need for viscosity management of molten resin using a microcomputer, etc., and automating the viscosity control of the molten resin under optimal conditions, allowing uniform products to be produced in large quantities at low cost.

[Brief explanation of the drawing]

The figures all show examples of the present invention; Fig. 1 is an enlarged sectional view of a base material, Fig. 2 is a configuration diagram showing an embodiment of the invention, and Fig. 3 shows an example of a product according to the invention. An enlarged cross-sectional view, FIG.
FIG. b is an enlarged sectional view of a main part of a product according to a modified example. A...Long base material, B...Surface fine double rough surface, C
...Diffuse reflection film layer, D...Fine particles, 1...Hopper, 1a...Pellet inlet, 2...Extruder,
3... T-die, 3a... slit, 4... molten resin curtain section, 5... supply drum, 6... pressure roll, 7... take-up drum, 8... cooling roll, 9... product.

Claims (1)

[Claims] 1. By applying a hot melt resin mixed with fine particles such as silicon oxide or titanium oxide to the surface of a base material such as plastic film or paper using an extrusion lamination method via a cooling roll with a finely roughened surface. , a method of forming a light ray diffused reflection film layer with a fine double rough surface on the surface of a base material.