JPS61219640A - Printed decorative board with high-hardness surface - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] "Objective of the Invention"<Industrial Application Field> The present invention proposes a printed decorative board with significantly higher surface hardness than conventional printed plywood and natural wood veneer decorative boards. It is economical and can be used for desk tops and countertops, where conventional printed plywood and natural wood veneer panels could not withstand use due to their low surface hardness. This paper proposes a decorative board that has excellent properties and can be mass-produced.

<Conventional technology> Until now, polyester decorative boards, melamine decorative boards, DAP decorative boards, etc. have been used for applications that require high surface hardness, and sometimes the top layer is attached to a surface with printed paper or natural wood veneer. A thick coat of paint has been used.

However, decorative laminates made of polyester, melamine, DAP, etc. had problems in mass continuous production and economy.
Products coated with a thick top coat paint are superior to the former in terms of mass production and economy, but their surface hardness is around H8 at best in terms of pencil hardness, and they have the disadvantage of being easily scratched.

<Problems to be Solved by the Invention> The decorative board of the present invention can be mass-produced, and in terms of economy, it is a proposal for a decorative board that is not much different from conventional printed plywood or natural wood veneer decorative board, and is The aim is to expand the uses of inexpensive decorative laminates.

Regarding decorative boards used for desk tops and countertops, the JAS special plywood standard has regulations regarding the FW type, but printed plywood and natural wood veneer decorative boards are
It is impossible to pass the scratch hardness test, abrasion resistance test, etc. required for the top plate, and even the frequently used pencil hardness test has no hardness.
At most, it remained around H8.

"Structure of the Invention"<Means for Solving the Problems> As a result of continued research into the mass production of decorative laminates with high surface hardness through a process as simple as the conventional printed plywood manufacturing process, the present inventor has developed the following. As described in the claims: (1) As the base material, a material whose surface has a pencil hardness of H and 3H is used.

(2) Use paper with a weight of 23 g/rn' to 35 g/m as the base paper for the decorative paper to be adhered to the surface of the base material, and perform arbitrary printing on the surface.

(3) The decorative printing surface is coated with a paint with a solid content of 5 g/m2 and 10 g/rr, and the surface hardness of the pre-coated paper thus obtained is in the range of pencil hardness ζH to 3H. (4) Attach the precoated paper to the base via an adhesive.

It has been found that the following configurations meet the objectives of the present invention.

The base material having a pencil hardness of H to 3H according to the present invention includes:
In addition to hardboard, particle board, medium-density fiber board, wood materials such as softwood and hardwood plywood with a coating layer such as a filler that passes the pencil hardness test, or plastics with a similar hardness. Examples include plates, metal plates, and inorganic plates.

The weight is 23 to 3 as base paper for decorative paper to be attached to the surface of the base material.
The reason for using 5 g/m is that the weight is 35
If the paper is thicker than g/m, when force is applied to the surface of the decorative board, the paper layer will yield and its hardness will be impaired, and if it is less than 23g/m, the strength will be weak and it will not stick. Due to difficult reasons.

As for the paint applied to the printed surface, amino alkyd resin, acrylic urethane resin, and polyester urethane resin paints, which have traditionally been used for decorative boards, are used as desired, but the amount of application is 5 g per minute
/ m' to 10 g/m"; if it is below the lower limit, it will be impossible to achieve the purpose of the present invention due to the thinness of the coating film; even if it is above the upper limit, it will not be possible to achieve the purpose of the present invention. This is because the coating film of the general-purpose paint, which is a heat-curable type, does not have the same hardness as melamine resin or polyester resin, so it tends to penetrate due to the wall thickness.

However, there are a variety of amino alkyd resin-based and other general-purpose paints, ranging from relatively soft films to those with high hardness, and when used as pre-coated paper, the surface hardness of the paper is from H to 3H. Select and use such paints.

By adhering the thus prepared decorative paper and base material with an adhesive, the printed decorative board with high surface hardness of the present invention can be obtained.

Effects> Since the decorative board of the present invention is constructed as described in the previous section, it has a hardness of H to 3H in the pencil hardness test, and in addition, an appropriate amount of a highly hard paint is used as the surface paint. It also passes the abrasion B test, scratch hardness B test, and impact B test specified by JAS standards for FW type special plywood. Although this was not expected at the start of the series of tests for the present invention, it is presumed that this is due to the hardness of the paint used in the composition of the present invention and the low penetration caused by the limited amount of coating.

Example 1: Gravure printing with a teak wood grain pattern in three colors, including ground color printing, was applied to the surface of a resin-mixed base paper (product name: hard sheet, manufactured by Shirakawa Paper Industries) weighing 23 g/m, and the surface was Acrylic urethane resin paint (prototype manufactured by Dainichiseika) 7
Prepare pre-coated decorative paper coated at a ratio of 1.5 g/m” in advance, fix this decorative paper to the surface of a polished stainless steel plate,
When the pencil hardness was measured, it showed a hardness of 2H.

Hardboard with a surface pencil hardness of 3H (product name:
Akimoku board (manufactured by Softwood Industry @) with a thickness of 4 mm and a size of 900 x 1800 mm was sequentially conveyed by a continuous laminator, and an ethylene vinyl acetate adhesive was applied to the surface at a rate of 30 g/m, and the pre-coated makeup was applied. The same adhesive was applied to the back side of the paper at a rate of 15 g/m', and after semi-drying, the sheets were laminated to obtain a decorative board having the desired high hardness surface of the present invention.

When this decorative board was subjected to surface strength tests such as abrasion B test, scratch hardness B test, impact Bg test and pencil hardness test specified in JAS standard FW type, the following values were obtained.

Wear B test Wear value 80 wear amount
0.08 g Scratch hardness B test 9.2μ Impact B test No cracking, peeling, etc. Pencil hardness test
2H For comparison, the same decorative printing paper was pasted on the same substrate without pre-coating, and then after-coated with the same paint to a solid content of 25 g/rn', the test results are as follows: Met.

Wear B test Wear value 94 Wear amount 0
．． 20 Scratch hardness B test 16.0μ Impact B test No cracking or peeling, but visible dents Pencil hardness test HB-H (Example 2) Resin-free base paper (Sanko Paper Co., Ltd.) with a weight of 30 g/m' ■
Precoated decorative paper was prepared by printing a light beige monochromatic color on the surface (manufactured by Dainippon Ink) and coating the surface with aminoalkyd resin paint (prototype manufactured by Dainippon Ink @) at a rate of 9 g/m. When the surface hardness of this precoated paper was measured in the same manner as in Example 1, it showed a hardness of 2H to 3H.

On the other hand, a medium-density fiber board with a surface pencil hardness of 2H to 3H (product name: Starwood, made by Kitashin Plywood ■) with a thickness of 20 mm,
A mixed solution of a vinyl acetate resin emulsion and a urea resin initial condensate was applied at a rate of 50 g/m onto a surface measuring 900 x 1800 mm, and the precoated paper was placed and bonded by hot pressing. About this decorative boardJ
When an AS-FW type test was conducted, all items were passed and the pencil hardness was 2H.

The same prerecorded paper is made of lauan plywood (5mm thick, 900X
1800 mm) with the same adhesive, the abrasion B test, scratch hardness B test, and impact B test did not reach the specified values, and the results of the pencil hardness test remained at HB to H.

Effects> As described above, the method of the present invention achieves the same performance as melamine decorative laminates and other decorative laminates that have been used for desk tops and countertops, which have conventionally been produced intermittently using hot presses. It is possible to continuously mass-produce decorative laminates at low cost, and it is extremely useful industrially.

Claims (1)

[Claims] On the surface of the base material whose surface hardness is H to 3H in terms of pencil hardness, arbitrary printing is performed on the surface of the base paper whose weight is 23 g/m^2 to 35 g/m^2, and furthermore, with solid content 5g
/m^2 or more and 10g/m^2 or less of paint is applied to the surface of the pre-coated paper, which has a surface hardness of H to 3H in terms of pencil hardness, and is pasted with an adhesive. High hardness printed decorative board.