JPH0664129A - Manufacture of decorative sheet - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a method for efficiently producing a decorative sheet having an uneven surface and excellent in design. [Structure] An electron beam curable resin 2 which is solid at room temperature is heated and applied in a liquid state on a substrate sheet 1, and then solidified by a cooling device 3, and then an electron beam irradiator 4 is used. The resin is liquefied at the same time as pressure is applied to the heated concavo-convex roll 5, and the resin is cured by being irradiated with an electron beam by the electron beam irradiation device 6 at the same time or immediately after the resin is released from the heated concavo-convex roll. To do.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a decorative sheet for a decorative plate used for furniture, housing equipment, etc., and in particular, efficiently produces a decorative sheet having irregularities formed on the surface and having an excellent design feeling. It provides a method.

[0002]

2. Description of the Related Art Conventionally, as a method for forming irregularities on the surface of a base sheet by electron beam curing, a method of applying an electron beam curable resin to an irregular roll in an electron beam irradiator and curing it, There is proposed a method in which an electron beam curable resin is applied to the sheet, conveyed to the inside of an electron beam irradiator and brought into contact with an uneven roll to cure the resin.

However, in these methods, since the electron beam curable resin before being irradiated with the electron beam in the electron beam irradiator is in a liquid state, it is necessary to press the liquid electron beam curable resin into the concave-convex roll. A resin pool is generated due to pressure and unevenness, and the liquid electron beam curable resin protruding from the substrate sheet adheres to the area of the uneven roll where the substrate sheet does not come into contact, and the electron beam is irradiated in this state. Since it is received and cured, it has become a problem that it becomes a foreign substance and adheres to the base sheet, and also causes plate clogging of the concavo-convex roll.

[0004]

SUMMARY OF THE INVENTION The present invention solves these problems and provides a method for efficiently producing a decorative sheet having an irregular surface formed thereon and having an extremely excellent design feeling.

[0005]

In order to solve such a problem, the present invention provides an electron beam curable resin which is solid at room temperature,
After being applied on a base material sheet in a liquid state by heating and cooled to be a solid state, the application surface of the base material sheet is pressed at the same time as a heated concavo-convex roll and is solid at the normal temperature. The electron beam curable resin is liquefied, and the electron beam curable resin is cured by irradiating an electron beam at the same time or immediately after the resin is released from the heated concavo-convex roll. A method for manufacturing a decorative sheet is provided.

The method of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, a solid electron beam curable resin 2 which has been liquefied by heating at room temperature is applied onto a substrate sheet 1 and then solidified by a cooling device 3, followed by an electron beam irradiator. 4 is brought into contact with the heated concavo-convex roll 5 to liquefy the resin, and the electron beam is irradiated from the back surface of the base sheet by the electron beam irradiation device 6 to cure the electron beam curable resin 2
Is cured and released from the heating roll to obtain a decorative sheet having surface irregularities.

In the above, the base sheet may be paper, plastic film or the like, and the electron beam curable resin which is solid at room temperature may be based on acrylic ester oligomers such as urethane acrylate, polyester acrylate and epoxy acrylate. It can be arbitrarily selected according to the material sheet.

[0008]

As described above, in the method for producing a decorative sheet of the present invention, before pressure bonding to a heated uneven roll,
The electron beam curable resin at the time of electron beam irradiation is solid, and before being cured by the electron beam, it becomes liquid only when it is in contact with the heated concavo-convex roll, becoming liquid, and becomes the concavo-convex shape of the heated concavo-convex roll. It only follows, and there is no extra resin accumulation or liquid resin spilling out from the base sheet, so that it does not contact the heated uneven roll of the base sheet or other transport rolls etc. There is no problem with adhesion.

[0009]

Example A base paper for decorative paper having a basis weight of 40 g / m ² was used as a base sheet, and a stone pattern was printed on the base paper. Then, an isocyanuric acid EO-modified triacrylate is used as an electron beam curable resin that is solid at room temperature, and this is used at 60 ° C.
After being heated to a liquid state and applied at 25 g / m ² on the printed surface of the cosmetic base paper, the electron beam curable resin is solidified by using a cool air device as a cooling device. ,
It was loaded into the electron beam irradiation device.

As the heated concavo-convex roll in the electron beam irradiation device, one pattern unit having a depth of 20 μm is formed on the surface of 50 to 50 μm.
A roll composed of patterns having groove-shaped irregularities of parallel straight lines or curved lines in the same direction with fine intervals of 300 μm, and combining a plurality of pattern units by changing the angle of the groove-shaped irregularities with at least adjacent pattern units. To use. About 60
The solid-state coated surface of the base material sheet is pressure-bonded to a state of being heated to ℃, and while being melted, an accelerating voltage of 200
Kv, 5Mrad electron beam is irradiated to cure the resin,
The decorative sheet was obtained by releasing from the heated concavo-convex roll.

The decorative sheet thus obtained had a very fine irregular shape formed in a sharp shape, and the position of reflection changed depending on the viewing angle, which was very attractive.

[0012]

As described above, in the method for producing a decorative sheet of the present invention, the electron beam curable resin at the time of electron beam irradiation is in a solid state before being pressure-bonded to a heated concavo-convex roll, Before hardening by, only when it is in contact with the heated uneven roll is heated to become liquid, only follows the uneven shape of the heated uneven roll, and becomes an extra resin pool or on the base sheet. The liquid resin does not squeeze out, and there is no problem when it adheres to the heated concavo-convex roll on a portion of the base material sheet that does not come into contact with it, or other conveyance rolls. Even if the base sheet is cut in the electron beam irradiator, the liquid resin is not cured except in the heated concavo-convex roll portion, and unnecessary resin can be easily removed.

The amount of resin applied to the base sheet is not the same as the method of pressing the liquid resin onto the concavo-convex roll from the top of the base sheet, which has an unstable factor due to resin accumulation. The resin once becomes solid and is stable because it is cured by the electron beam while being melted by the heated uneven roll portion. The resin is in a liquid state only at the time of application and at the uneven roll portion heated, and the degree of freedom in conveying the sheet before and after the electron beam irradiation device is extremely high.

[0014]

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a method for manufacturing a decorative sheet according to the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base material sheet 2 ... Electron beam hardening type resin 3 ... Cooling device 4 ... Electron beam irradiation machine 5 ... Heated uneven roll 6 ... Electron beam irradiation device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B32B 31/00 7141-4F 31/28 7141-4F (72) Inventor Akira Niwayama Taito-ku, Taito-ku, Tokyo 1-5-1 Toppan Printing Co., Ltd. (72) Inventor Yukio Fujie 1-5-1 Taito Taito-ku, Tokyo 1-5 Toppan Printing Co., Ltd. (72) Inventor Yukio Suzuki 1-chome Taito, Taito-ku, Tokyo No. 5 No. 1 Toppan Printing Co., Ltd.

Claims (1)

[Claims] 1. An electron beam curable resin, which is solid at room temperature, is applied to a base material sheet in a liquid state by heating, cooled to a solid state, and then applied to the base material sheet. The surface is liquefied with a solid electron beam curable resin at room temperature at the same time when it is pressed to a heated concavo-convex roll, and the electron beam curable resin is cured by irradiating an electron beam at the same time or immediately thereafter, and the heated concavo-convex pattern is obtained. A method for producing a decorative sheet having surface irregularities, characterized by releasing from a roll.