JPS5930551B2 - makeup sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a decorative sheet.
Although the base material is thin paper of approximately 40 y/d, it is easy to adhere flatly to substrates with recesses such as plywood, and has excellent paper-to-paper strength, and has excellent ink adhesion and resistance when printing patterns. To obtain a decorative sheet which also has an excellent coloring effect.

Conventionally, the most common decorative sheet for building and furniture materials is 2.
3j/Thin paper of about Trl is used and because it is very thin, it is less effective in hiding the color of substrates such as plywood and particle board.

Therefore, if you increase the paper thickness and use paper of, for example, 30 to 40 y/Tr, the strength between the paper sheets will decrease, and if you stick cellophane adhesive tape on the surface of the decorative paper, it will be easier to peel off from the paper sheet. , there are problems such as the tendency to cause eye thinning when attached to a substrate such as plywood. Therefore, in order to solve the above problems, synthetic resin is mixed into the paper during paper making, and a synthetic resin liquid is applied to the paper surface before pattern printing to strengthen the inter-paper strength and give even a little rigidity to the decorative paper. Attempts have also been made to reduce eye loss.

However, when looking microscopically at the surface of decorative paper mixed with or coated with the above-mentioned resins, it is possible to see scattering or bleeding of the printing ink due to minute irregularities during papermaking or fluffing of the fibers, or the vehicle in the ink being mixed into the paper. It is difficult to produce beautiful printed decorative paper due to color development and loss of luster due to inhalation.

In the present invention, as a result of studying the above problems, after forming an impermeable (oil) layer using thermoplastic synthetic resin on the surface of thin paper, it can be used as is or after surface roughening treatment, and then the surface can be printed using normal gravure printing or offset printing. This problem was solved by printing a pattern.

The present invention will be explained in more detail below with reference to the drawings. First, a water-impermeable (oil) layer 2 of thermoplastic resin is formed on the surface of a thin paper 1 having a weight of about 18 to 40 m' as a base material.

Note that a synthetic resin paint such as urethane resin or acrylic resin may be applied as a sealer 5 to the surface of the thin paper 1 in advance. Furthermore, when the water-impermeable (oil) layer 2 of thermoplastic synthetic resin is pressurized with a calender roll or the like, the thermoplastic synthetic resin is press-fitted into one layer of thin paper and a smooth finish can be achieved.

Then, the surface of the impermeable (oil) layer 2 is roughened by corona discharge treatment, acid treatment, etc. as necessary, and patterns 3 and 4 are printed on the top surface by a normal printing method to form a decorative sheet. .

Note that after the surface is roughened, a synthetic resin such as urethane resin may be applied as an anchor coat 6 to the upper surface. After completing the above steps, it is optional to apply a regular top coat.

Thin paper 1 used in the present invention is generally used 18-40
Any paper with good resin impregnation of V/A may be used, and titanium-mixed paper with enhanced hiding properties or synthetic resin-mixed paper with consideration to performance such as paper peeling can also be used.

The sealer 5 is applied for the purpose of improving the adhesion between the thin paper 1 and the water-impermeable (oil) layer 2 and strengthening the gap between the thin paper 1 and the water-impermeable (oil) layer 2. If the adhesion is good, there is no need to perform it.

The synthetic resin paint used as the sealer 5 may be urethane, acrylic resin, or the like, and may be applied at a rate of about 5 to 10 t/Trl using a roll coater or gravure coater. The thermoplastic synthetic resin that will become the water-impermeable (oil) layer 2 is a general-purpose polyethylene, polypropylene, polystyrene, vinyl chloride resin, etc., heated and melted using a T-die or gravure coater (thickness 10 to 200 μm).
Apply and form to a certain extent.

The water-impermeable (oil) layer 2 fills minute irregularities on the surface of the thin paper 1, prevents fuzzing and suction of printing ink, and eliminates deterioration of printing effectiveness such as ink bleeding.

In order to improve the hiding power of the decorative sheet, if titanium oxide powder or the like is mixed in an amount of about 3 to 20% by weight based on the thermoplastic synthetic resin, the hiding effect will be further improved. In addition, impervious water (
It is preferable to press heat and press using a calendar roll during or after the formation of the oil layer 2, since the thermoplastic synthetic resin is press-fitted between the layers of thin paper, and the adhesion to the thin paper 1 and smoothness are increased.

Surface roughening such as corona discharge treatment or acid treatment to form minute irregularities 7 on the surface of the water-impermeable (oil) layer 2 as needed, and the anchor coat 6 applied to the upper surface of the surface roughening, are performed using printing inks 3, 4. This is done for the purpose of improving adhesion to the water-impermeable (oil) layer 2, and does not need to be carried out if, for example, the thermoplastic resin of the water-impermeable (oil) layer 2 is vinyl chloride resin or polystyrene resin.

For example, when corona discharge treatment is applied to polyethylene or polypropylene resin, the output is 3 to 4 KW and the frequency is 110 KHz.
It's fine as long as it's a certain amount. The anchor coat is a urethane resin paint with excellent adhesion. The pattern printing 3 and 4 is performed by overprinting two or three plates using conventional gravure printing, letterpress printing, offset printing, etc. to express a desired pattern.

As described above, the present invention has the following effects.

(1) Since the thin paper has a water-impermeable (oil) layer made of thermoplastic synthetic resin on its surface, it has a certain degree of rigidity as a decorative sheet and can be smoothly attached to substrates such as plywood. (2
) Since the surface of the thin paper is treated with a sealer coat such as urethane or acrylic resin, and an impermeable (oil) layer is provided, the interpaper strength is greatly improved.

When printing patterns on conventional thin paper, it is necessary to use a deep printing plate to transfer a large amount of ink in order to avoid ink absorption.

However, when looking at this ink layer microscopically, the ink layer loses its shape on the thin paper surface and loses its sharpness, reducing the printing effect. However, in the present invention, since an impermeable (oil) layer is formed on the surface of the thin paper, there is no ink suction or bleeding, and printing is possible with a small amount of ink, so the ink layer remains very sharp without losing its shape. You can print.

(4) Since titanium oxide and the like can be mixed into the thermoplastic synthetic resin of the water-impermeable (oil) layer, the hiding power of the decorative sheet can be greatly improved compared to conventional thin paper.

(5) The impermeable (oil) layer easily reflects light, and when printed with a wood grain pattern, a beautiful decorative sheet with an appearance similar to that of natural wood can be obtained.

(6) Since the decorative sheet of the present invention is based on thin paper, its dimensions are more stable against heat than vinyl chloride sheets made of a single synthetic resin, so it is resistant to the heat of drying printing ink during printing. The sheet hardly stretches or contracts, and it is easy to print patterns similar to paper, resulting in a precise printing finish without causing any misalignment of the printed pattern. In addition, when bonding to a substrate such as plywood, even if the adhesive used is a water-based or emulsion type adhesive that easily stretches and contracts the paper, the thermoplastic synthetic resin formed on the paper surface is water-impermeable (oil-impermeable). ) layer prevents the paper from expanding and contracting, the decorative sheet can be applied accurately without wrinkles or misalignment, and the decorative sheet of the present invention is dimensionally stable against moisture. (7) When attaching to a substrate such as plywood,
Because the adhesive surface is thin paper, ordinary general-purpose vinyl acetate resin adhesive can be used, and it is a cheaper adhesive than conventional adhesives used to adhere sheets made of pure synthetic resin such as vinyl chloride sheets and synthetic paper. Can be used.

Next, examples will be given.

Example 1 A urethane resin paint of 107/7rI was applied as a sealer to the surface of a thin paper weighing 23y/Trl, and then dried to remove the solvent in the paint. Next, 10% by weight of titanium white was mixed into the polyethylene resin heated and melted at 250°C. The resulting thermoplastic synthetic resin was injection coated using a T-die to form an impermeable (oil) layer with a thickness of 25 μm.

Next, apply the surface of the impermeable (oil) layer to the electrodes at a spacing of 1W! ” Output 4
After corona discharge treatment under the conditions of KW and frequency of 110 KHz, 5 tons of urethane resin paint was applied as an anchor coat.
Rrl coating was applied, and then solid printing and two wood grain patterns were printed using a conventional gravure printing machine to obtain the desired decorative sheet. Example 2 A thermoplastic synthetic resin made by mixing 5% by weight of titanium white into vinyl chloride resin heated and melted at 150°C was applied on the surface of a thin paper weighing 40t/Trl by injection using a T-die to form a water-impermeable (20μ thick) sheet. oil) layer.

Next, on the surface of the water-impermeable (oil) layer, solid printing and two
The desired decorative sheet was obtained by printing a flower pattern and then coating it again with transparent urethane resin paint.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the decorative sheet of the present invention. FIG. 2 is a sectional view showing another embodiment of the present invention. 1...
... Thin paper, 2... Impermeable (oil) layer, 3, 4...
... Pattern printing layer, 5 ... Sealer layer, 6.
... Anchor coat layer, 7 ... Minute irregularities, 8 ... Top coat layer.

Claims (1)

[Claims] 1 Water-impermeable (oil) thermoplastic synthetic resin on the surface of regular thin paper
A decorative sheet having a pattern printed layer on the upper surface either as is or after surface roughening treatment.