JPS6217539B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention 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, 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. A diffusely reflective film with a finely rough surface is formed on one surface of the base material by applying hot melt resin mixed with fine particles of silicon oxide, alkaline earth, etc. via a cooling roll with a smooth surface using the John lamination method. The present invention relates to a method for continuously forming layers (matted layers).

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 characteristic feature is that silicon oxide and alkali are coated on one side of a base material such as plastic film or paper using an extrusion lamination method. To provide a method for forming a light ray diffused reflection film layer with a finely rough surface on one surface of the base material by applying a hot melt resin mixed with fine particles such as earth through a cooling roll with a smooth surface. It is in.

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, which has a wall thickness of about 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.

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 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 with a smooth 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 moves the molten resin curtain portion 4 on the surface of the pressure roll 6 at a predetermined speed in the direction of the arrow.
By allowing the resin to fall evenly between the surface of the base material A and the cooling roll 8, the surface of the molten resin attached to one surface of the base material A that has passed through the pressure roll 6 is cooled and solidified by the cooling roll 8, and the surface is made up of fine particles D. Diffuse reflection film layer (matte layer) C having a finely rough surface B
has a uniform average thickness (10~20μ) as shown in Figure 3.
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.

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.

As described above, according to the present invention, a hot molten resin mixed with fine particles of silicon oxide, alkaline earth, etc. is cooled to a smooth surface by extrusion lamination on one side of a base material such as a plastic film or paper. A light ray diffused reflection film layer with a finely roughened surface is formed on one side of the base material by applying it via a roll, so no solvent is used compared to the conventional solvent-melted resin method. No clogging of the cooling roll and no uneven coating.

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, it is possible to firmly adhere and form a diffusely reflective rough surface on a base material using a heated and melted resin containing fine particles such as silicon oxide or alkaline earth metals, so it can be realized even with a resin that does not dissolve in solvents.
Furthermore, there is no need to control the concentration of the molten resin, and the viscosity control of the molten resin using a microcomputer can be automated under optimal conditions, making it possible to manufacture uniform products in large quantities at low cost, which is a new and useful effect industrially.

[Brief explanation of the drawing]

Each figure shows an embodiment of this invention.
FIG. 1 is an enlarged sectional view of the base material, FIG. 2 is a configuration diagram showing an embodiment of the invention, and FIG. 3 is an enlarged sectional view showing a part of the product according to the invention. A... Long base material, B... Fine rough surface, C... Diffuse reflective 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 Pigment is applied to the surface of a base material such as plastic film or paper by extrusion lamination
Forming a light scattering reflection film layer with a finely rough surface on the surface of a base material by applying a hot melt resin mixed with fine particles such as silicon oxide or alkaline earth salt via a cooling roll with a smooth surface. A method for forming a light ray diffused reflection film layer on the surface of a base material, characterized by: