JPH0497844A - Preparation of decorative base table - Google Patents

Abstract

PURPOSE:To obtain a decorative base table with a minute pattern of irregularities printed thereon by laminating a resin layer on the surface of the base table, applying thereto a crosslinked and oriented polyethylene film which is characterized by a high density and a high degree of crosslinking, pressing them to transfer a pattern of irregularities from the film to the surface of resin layer and removing the film therefrom. CONSTITUTION:To the surface of a base table 1, a printed paper 2 is pasted with an adhesive agent. A resin layer 3 is laminated on the printed paper 2. A crosslinked and oriented polyethylene film 4B having a pattern of irregularities is applied on this resin layer 3. The crosslinked and oriented polyethylene film 4B is pressed by means of a press roll 5 under almost as much a pressure as the resin layer 3 is made even and then the resin layer 3 is cured and allowed to stand for aging, followed by peeling off the crosslinked and oriented polyethylene film 4B.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a vanity board, and particularly to a transfer release film used in manufacturing a vanity board.

[Prior Art] and [Problems to be Solved] Interior materials, which are one of the building materials that make up a house, are coated with various types of cosmetics with the main purpose of enhancing their aesthetic appearance.

One method involves gluing patterned paper such as printed paper onto plywood, coating unsaturated polyester resin mixed with a catalyst and accelerator on top of that, and then placing an embossed film on top of that, and then applying a pressure roll. There is a method for manufacturing a vanity board in which the embossed film is pressed from above to transfer the embossed pattern (uneven pattern) to the resin layer, and after the transfer, the embossed film is peeled from the resin layer.

Generally, polyester film, polyester/polyvinyl alcohol laminated film, and polyvinyl alcohol film are used as the embossed film, but these films do not always have the ability to transfer embossed patterns (uneven patterns), especially fine patterns. It wasn't enough.

The present invention aims to eliminate the drawbacks of such prior art.

[Means for Solving the Problems] The present invention involves laminating a resin layer on the surface of decorated plywood, gypsum board, etc., and on the resin layer is made of high-density polyethylene and has a high degree of crosslinking. A cross-linked stretched polyethylene film formed by lowering inward in the thickness direction or forming an uncross-linked portion and stretched in at least one direction, the film having an uneven pattern is brought into contact with the film. The method of manufacturing a vanity board is characterized in that the uneven pattern of the film is transferred to the surface of the resin layer by pressing, and then the film is peeled off.

The film for molding (with an uneven pattern) of the present invention is made of a stretched film with a special crosslinked structure.

Generally, when attempting to add an uneven pattern to a plastic film by embossing, it is necessary to heat the embossing roll, but the stretched film with the special crosslinked structure according to the present invention does not require such heating, which is normally required. It is possible to add an uneven pattern to the film without having to do so. That is, it has the unique feature that it is possible to form an uneven pattern on the film at room temperature without requiring heating.

Moreover, the uneven pattern formed in this manner has the peculiarity that it does not disappear even when exposed to heat of about 60° C., although it disappears when exposed to heat.

The present inventors have found that by using such a film in the above-mentioned applications, it is possible to easily and clearly form an uneven pattern, even a fine uneven pattern, on the surface of the resin layer on the base plate. Knew.

In other words, the uneven pattern remained without disappearing, and it was possible to obtain a decorative table board having an uneven pattern on its surface by resisting the pressing force of the pressure roll.

Furthermore, the film not only had good shape properties and transferability, but also had good mold release properties since it was made of a polyethylene film.

Next, an example of the manufacturing method of the present invention will be explained based on the drawings.

FIGS. 1(A) to (D) are cross-sectional views showing the steps of an embodiment of the present invention, in which a printed paper 2 is attached to the surface of a base plate 1 with an adhesive [FIG. 1(A)] . A resin layer 3 is laminated on this print paper 2 [FIG. 1(B)]. On this resin layer 3,
The embossed cross-linked stretched polyethylene film 4B according to the present invention is brought into contact with the cross-linked stretched polyethylene film 4B, and the pressure roll 5 presses the cross-linked stretched polyethylene film 4B with a pressing force that makes the resin layer 3 flat [Fig. (C)], then
After curing and aging of the resin layer 3, the crosslinked stretched polyethylene film 4B is peeled off [FIG. 1(D)].

Examples of the base plate 1 include plywood, gypsum board, and cement fiber board. A specific example of plywood is ordinary plywood. fiberboard,
Wood products such as laminated wood and particle board can also be included.

Specific examples of gypsum-based boards include gypsum board and sound-absorbing gypsum board (with many holes drilled to provide sound absorption).
, resin-impregnated plaster. Specific examples of cement fiber-based boards include calcium silicate boards (boards made from calcium silicate, etc.), wood chip cement materials (small scraped pieces of wood treated with chemicals, mixed with cement, and pressure-molded into a board or block shape). The following examples can be mentioned.

As mentioned above, the decorated plywood referred to in the present invention is:
In addition to cases where various materials are overlaid on the surface of the base plate, such as pasting printed paper 2 on the surface of the base plate 1 with adhesive, cases where decoration is applied to the plywood surface by means such as painting or printing. is also included.

Therefore, there are printed plywood (the surface of lauan plywood is smoothed with a filler and a wood grain pattern is printed on it, and there is also one with printed paper pasted), melamine plywood (with melamine resin overlaid), Core plywood, cross plywood, colored boards (colors, patterns and wood grains painted or printed directly on the surface of various smooth boards), embossed boards (embossed patterns on the surface of various boards), etc. Included.

For the resin layer 3, a material that is cured at room temperature or by heating, such as an unsaturated polyester resin mixed with a catalyst and a promoter, is used. The resin layer 3 is formed by pressing the embossed cross-linked stretched polyethylene film 4B, and then, after curing and aging the resin layer 3, when the cross-linked stretched polyethylene film 4B is peeled off, the uneven pattern of the film 4B is transferred thereto. applied in the form.

In the present invention, the pressing force when pressing the crosslinked stretched polyethylene film 4B is sufficient to make the resin layer 3 flat. That is, as described above, since the film used in the present invention has good shape properties (and transferability), transfer can be performed with light pressure. The pressing force is 5 in linear pressure.
~20 kg/cm2 is sufficient.

In the above example, pressing by the pressure roll 5 was exemplified, but means such as a press may also be used.

Curing and aging of the resin layer 3 may be performed by heating, but may also be performed at room temperature. Curing and aging are performed by leaving the film at room temperature for 20 to 30 minutes, for example.

Since the film used in the present invention has good releasability, it can be easily peeled off from the resin layer 3 and used repeatedly.

In this way, an uneven pattern, particularly a fine uneven pattern, can be easily and clearly formed on the surface of the resin layer 3 on the base plate 1.

Next, the embossed crosslinked stretched polyethylene film 4B according to the present invention will be further explained.

FIG. 2 is an explanatory diagram of a step of embossing a crosslinked stretched polyethylene film 4A according to the present invention to obtain a squeezed crosslinked stretched polyethylene film 4B having an uneven pattern.

As shown in FIG. 2, a cross-linked stretched polyethylene film 4A according to the present invention is placed between a press roll 6 and a squeezing roll (emboss roll) 7, and the embossing roll 6 and press roll 7 are heated at room temperature. The cross-linked stretched polyethylene film 4B having the pattern 4C formed thereon is obtained by passing the polyethylene film 4B through the film without heating.

The polyethylene crosslinked stretched film 4A used in the present invention, in which the degree of crosslinking is reduced inward in the thickness direction of the film or has uncrosslinked portions, is, for example,
By irradiating an electron beam from both sides of a polyethylene resin raw sheet, a sheet having a specific crosslinking degree, for example, both surface layers are crosslinked but the middle layer has a low degree of crosslinking, for example, is uncrosslinked, is made into a tenter. It can be obtained by biaxially stretching or rolling a sheet between rolls in the machine direction (MD) and then stretching in the transverse direction (TD) to form a film.

FIG. 3 shows a cross-sectional view of an example of the layer structure of the film 4A.

In the figure, 40 is an intermediate layer, a layer with a low degree of crosslinking,
For example, an uncrosslinked layer.

41 and 42 are surface layers, and both surface layers are layers with a high degree of crosslinking due to irradiation with electron beams from both sides, for example.

Since it has a specific degree of crosslinking and has been stretched, the film (hereinafter referred to as BOPE film) 4A can be used at room temperature without heating, for example by pressing rolls, as in the above example. 6 and the squeezing roll 7, it is possible to obtain the squeezed crosslinked stretched polyethylene film 4B having the pattern 4C as in the above example.

FIG. 4 schematically shows a cross section of an example of the film 4B.

An example is shown in which a recess 100 is formed on the surface of the film 4B and a protrusion 101 is formed on the back surface.

The upper ID B OP E film 4A has, for example, a density of 0, 935 g/cm3 or more, and a melt index (J
Measured according to ISK 6760, temperature 190°C
Measured at 1 load of 2.16 kg, hereinafter referred to as MI) is 05
Consisting of ~20g/10min polyethylene.

In the present invention, linear low density polyethylene (LLDPE) or (and) petroleum resin is added to high density polyethylene by 15%.
A δ1 fat composition may also be used.

The above-mentioned degree of crosslinking can be expressed as a gel fraction, and the gel fraction is the insoluble portion obtained by extracting a sample with boiling P-xylene.

The crosslinked layer 41.42 has a gel fraction of 20 to 70 wt%, and the intermediate layer 40 has a gel fraction of 0 to 5 wt%, and the composition ratio of each layer is uncrosslinked layer: both crosslinked layers = 1:0.1 to 1o. A biaxially stretched film having a stretching ratio of 3 times or more in at least one direction and an area ratio of 7 times or more is preferred. Even in the case of crosslinked biaxially stretched films, those subjected to unbalance stretching in MD and TD are preferable for transferring the uneven pattern.

The thickness of the BOPE film 4A is usually about 10 to 120 LL.

Regarding the manufacturing method and other preferable conditions for the BOPE film 4A, the matters disclosed in Japanese Patent Application Laid-open Nos. 59-174322 and 61-74819 can be applied.

[Examples] Examples of the present invention are shown below. In addition, each physical property in an Example was measured by the test method shown below.

fl) MI: JIS K 6760 (2)
Gel fraction: ASTM D 2765 A method compliant (3) Haze: JIS K 6714 Example 1
A resin composition having a density of 0.953 g/cm 3 and an MI of 0.7 was extruded from a T-Guy at 250° C. using an extruder and cooled to form a sheet. This sheet was irradiated with an electron beam of 20 Mrad from both sides, so that the ratio of crosslinked layer: final crosslinked layer: crosslinked layer was 1:0.5:1, and the gel fraction was as follows: irradiated surface: lowest; irradiated surface = 50: O: 50 original fabric sheet (40
0 micron thickness) was obtained. This sheet at a temperature of 110℃,
Stretching was performed at a stretching ratio of 1.2 times in the MD direction and 7.5 times in the TD direction to obtain a stretched film (50 microns thick).

Haze value: 4.0, rigidity (kg/cm3): 20,000
Met.

This crosslinked stretched film was embossed at room temperature without heating as shown in FIG. Even when the film was heated to 60° C., this uneven pattern did not disappear.

Unsaturated polyester containing a peroxide catalyst was applied to plywood to which printed paper had been pasted, and the above embossed crosslinked stretched film was placed on the plywood, and a linear pressure of 10 kg/c was applied using a pressure roll.
When the embossed crosslinked stretched film was peeled off after being left at room temperature for 30 minutes, an uneven pattern could be formed on the film.

[Effects of the Invention] According to the present invention, the drawbacks of the prior art are overcome, and a vanity table with an uneven pattern, particularly a fine uneven pattern, is provided on its surface with good shapeability, transferability, and peelability. I was able to get the board.

Moreover, the embossed film in the present invention has the following characteristics at room temperature:
Since the uneven pattern can be formed on the film without the need for heating, there is also the advantage that it saves energy and does not require a large heating device.

Furthermore, the film has the advantage of being highly transparent, having good anti-waterfall properties, and being superior in various aspects such as strength and rigidity compared to general polyethylene films.

Also. Even with deeply uneven embossing, the film did not crack, and the etching pattern on the film surface did not disappear even when heated.

An explanatory diagram of the embossing process of shims, FIG. 3 is a cross-sectional view of the structure of polyethylene crosslinked stretched films used in the present invention,
FIG. 4 is a cross-sectional view of polyethylene crosslinked stretched films after unevenness has been formed.

■　・ 2・ 3・ 4 A・ 4 B・ 4 C. 5・ 6・ 7・ ・Bed plate printed paper ・Resin layer ・Cross-linked stretched polyethylene film ・Cross-linked stretched polyethylene film ・Uneven pattern ・Pressure roll ・Suppression roll ・Emboss roll Patent applicant: Tonen Petrochemical Co., Ltd. Representative Patent Attorney Yoshihiro Sato No. figure No. Dairy section figure z No.

Claims (1)

[Claims] 1. A resin layer is laminated on the surface of a baseboard such as decorative plywood or gypsum board, and on the resin layer is made of high-density polyethylene and the degree of crosslinking decreases inward in the thickness direction. A cross-linked stretched polyethylene film having a cross-linked or uncross-linked portion and stretched in at least one direction, the film having an uneven pattern is brought into contact with the film and pressed against the surface of the resin layer. A method for manufacturing a vanity board, which comprises transferring the uneven pattern of the film, and then peeling off the film.