JPS60198241A - Composite flitch and manufacture thereof - 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 [Technical Field] The present invention relates to a composite plywood that can be bent and used for desks, chest drawers, and other furniture.

[Background technology] When manufacturing desks, chests of drawers, and other household items using plywood, it is necessary to bend the plywood. Therefore, there are some devices that have been devised to make this kind of bending process easier. That is, a composite plywood is formed by fusing and pasting a decorative film 7 made of a thermoplastic resin film onto the surface of the plywood 6, and a V-shape is formed on the back side of the plywood 6 as shown in FIG. Groove 8 is cut and provided, and further as shown in Fig. 6 (
As shown in b), the decorative film 7 is bent at the V-shaped groove 8 portion, the inner surfaces of the ■-shaped groove 8 are butted against each other, and the butted surfaces are bonded with adhesive, so that the plywood 6 can be bent. This is what I did. In this product, bending can be performed using the decorative film 7 that has been given a decorative effect by printing, etc., but this product is only used as plywood with the decorative film 7 always appearing on the surface. I couldn't do it, so I used makeup film 7.
Even if a wood grain pattern was printed on the plywood, it would not be possible to obtain a plywood with a natural wood texture, and it would remain an imitation. In addition, in manufacturing such a composite plywood to which the decorative film 7 can be applied, the plywood 6 is first manufactured in the plywood manufacturing process, and then the decorative film 7 is applied to the plywood 6. It is necessary to send the decorative film 7 to the plywood 6 and attach it to the plywood 6, which requires two steps, which also poses a problem in terms of manufacturing man-hours.

[Object of the Invention] The present invention has been made in view of the above points, and its primary purpose is to provide a composite plywood that has a natural wood texture and is easy to bend. A second object of the present invention is to provide a method for manufacturing composite plywood that can manufacture composite plywood in one step in the plywood manufacturing process.

[Disclosure of the Invention] The composite plywood according to the present invention is a plywood formed by laminating and bonding a plurality of veneer veneers 1, 2...
The outermost veneer veneer 1 and the inner veneer veneer 2 are bonded together by an adhesive layer 4 made of a thermoplastic resin film 3, and the other veneer veneers 2 are bonded by adhesive M5. The method for manufacturing composite plywood according to the present invention is characterized by
A thermoplastic resin film 3 is arranged between the veneer veneer @ 2 on the inside thereof, and an adhesive is arranged between the other veneer veneers 2, and each veneer veneer 1, 2... is stacked,
This is characterized by laminating and adhering each veneer veneer veneer 1°2... to each other by heating and pressurizing this, and the present invention will be described in detail below.

As the veneer veneers 1 and 2, rotary lace or slices of any variety of trees can be used.
Among the veneer veneers 1 and 2, the veneer 1 that appears on the surface of the plywood 6 is a veneer such as Agatis veneer or Merapi veneer, which has a cosmetic effect even if it is more expensive than ordinary lauan veneer. It is better to use Then, a plurality of veneer veneers 1 and 2 (usually an odd number of veneer veneers, three or more) are bonded together in layers f1 to form plywood 6. As shown in Fig. Among 1 and 2, veneer veneer 1 appearing on the surface of plywood 6 and veneer veneer 2 inside this veneer veneer 1
An adhesive layer 4 made of a thermoplastic resin film 3 is used to adhere the veneer veneer 2, and an adhesive layer 5 made of an adhesive used in ordinary plywood is used between the veneer veneer 2.
The composite plywood according to the present invention is formed by bonding.

To explain the outline of the manufacturing of this composite plywood, as shown in Fig. 2, a thermoplastic resin film 3 is placed between the veneer veneer 1 appearing on the surface and the veneer veneer 2 on the inside of this veneer veneer 1. The other veneer veneer 2 is coated with a thermosetting resin adhesive used for manufacturing plywood, such as 7er/melamine, area, etc.
The veneer veneers 1 and 2 are bonded together by the adhesive layer 3 formed by melting the thermoplastic resin film 3, and the veneer veneer is bonded by the adhesive layer 5 formed by curing the adhesive. The veneer veneers 1 and 2 are bonded together, and the veneer veneers 1 and 2 are laminated and bonded in this manner.

Here, a composite film 10 is used as the thermoplastic resin film 3 for bonding the veneer veneers 1 and 2 together. ! As shown in Figure PI3, the composite film 10 is formed of at least three or more layers, and the core layer 11 has excellent strength, especially tensile strength, and has a softening temperature similar to that of plywood 6.
It is formed from a film of a resin that is heated at a temperature higher than the heating temperature used in producing the film.The heating temperature is usually about 115 to 135°C, so polypropylene, polyethylene terephthalate, polyamide, etc. can be used as the resin. The surface layer 12 is made of a resin that has excellent adhesion to wood and has a softening temperature lower than the heating temperature used to manufacture the plywood 6. This resin is typically a polyolefin-based resin such as polyethylene with improved adhesion. It is better to use In other words, polyethylene and other materials are cheap and can have a relatively low softening temperature, but polyolefins such as polyethylene are nonpolar and have low adhesive properties, so polar monomers are copolymerized and introduced into the polyolefin molecules to impart polarity. , which enables high adhesiveness to be obtained. As the polar moamer to be copolymerized with polyoleain, unsaturated carboxylic acids or derivatives thereof can be used, and examples thereof include acrylic acid, methacrylic acid, maleic acid, fumaric acid, methyl acrylate, methyl methacrylate, monomethyl fumarate, and maleic acid. These include acid amides. Commercially available resins made by copolymerizing a polar moamer with a polyolefin can be used, such as Mitsubishi Yuka's 1-Atomer, Sumima Kagaku's Bond First, and Toa Fuel Chemical's “H.A.
series” and Exxon's “Dexon”. When creating the composite film 10, a surface layer 1 is usually added to the resin film 13 for the core Hall.
This is done by laminating the resin films 14 for both films 1 and 2.
In order to improve the adhesion of 3°14, it is preferable to perform a corona discharge treatment and use a dry laminating adhesive or an anchor coating agent. However, composite film 1
0 to lHJ]ff When creating by laminating films 13 and 14, there are two methods: bonding the formed films together, and bonding the formed film with the film immediately after being extruded from the extrusion molding machine. However, first we will explain the former method in detail.

That is, as shown in FIG.
6 to form a film by cooling it,
The resin films 13 and 14 are each subjected to a corona discharge treatment. Of course, the corona discharge treatment may be applied to pre-molded resin films 13 and 14. In the corona discharge treatment, a high frequency and high voltage is applied between the insulated electrode 19 connected to the transformer 7 ohmer 18 of the corona discharge treatment tube 17 and the grounded dielectric roll 20 to cause dielectric breakdown of the air and cause corona discharge. This is done by generating corona discharge and passing resin films 13 and 14 during this corona discharge. By subjecting the surfaces of the resin films 13 and 14 to corona discharge treatment in this way, the resin film 1
3. 14's husband side is f version Zeshai I P1- and 9 I sex I P → Chi 1
- Me - Phase 1 ■ Effect 7 Norm 13.14 This is to increase the adhesion between the two resin films 13.14.After this, a dry laminating adhesive such as a urethane adhesive is applied to at least one of the resin films 13.14, and this dry laminating adhesive is applied to at least one of the resin films 13.14. Attach resin film 1 to both sides of tree + ffi film 13 via laminating adhesive.
4 is laminated to form a core layer 11 made of a resin film 13.
A surface Ivi12 formed by a resin film 14 is formed on both sides of W
A composite film 10 as shown in FIG. 3 is obtained.

Next, a method for obtaining the composite film 10 by laminating a film immediately after extrusion onto a preformed film will be described. In this case, it is normal to use the resin film 13 for the core layer 11 as the pre-formed film, and the resin film 14 for the surface layer 12 as the film immediately after extrusion. 13 is subjected to corona discharge treatment in the same manner as above, and an anchor coating agent is applied to the surface of the film 13.

The anchor coating agent has high polarity, and this polarity increases the polarity of the surface of the molded resin film 13 and activates it. As anchor coating agents, grown titanium-based anchor coating agents, polyethyleneimine-based anchor coating agents, and incyanate-based anchor coating agents are provided, but isocyanate-based anchor coating agents are preferred in terms of their excellent heat resistance. The resin film 14, which is in a softened state immediately after being extruded from an extrusion molding machine, is placed on both sides of the resin film 13 treated in this way, and this is passed through a roll or the like to coat both sides of the resin film 13 through an anchor coating agent. Resin film 1
4 is fused to obtain a composite film 10 in which surface layers 12 made of resin films 14 are laminated on both sides of a core layer 11 made of resin films 13. Here, U (the surface of the resin film 13 has been polarized and activated by corona discharge treatment and treatment with an anchor coating agent,
．． A composite film 10 in which 14 is integrated with high adhesive strength can be obtained. Composite film 1
0, the thickness of the core layer 11 is preferably set to 20 to 200 μm, and the thickness of the surface layer 12 is preferably set to 20 to 100 μm.

The composite film 10 obtained as described above is used as the thermoplastic resin film 3 to produce plywood 6, and the production of plywood 6 will be described in detail below. First, the veneer veneer Fi2 other than the veneer veneer 1 appearing on the surface of one side of the plywood 6 is coated with an ordinary adhesive for manufacturing plywood.

As this adhesive, a thermosetting resin adhesive such as phenol, melamine, or urea is used, but it is also possible to use a thermoplastic resin adhesive that has recently come into use. Then, the veneer veneer @ 2 is stacked, and the veneer veneer 1 is further stacked so that it comes to the surface position. As shown in Figure 2, the veneer veneer 1 on one side of the upper and lower veneer veneers 1 and the veneer veneer on the inside A thermoplastic resin film 3 is sandwiched between the boards 2 and -, and by heating and pressurizing it between the upper and lower heating plates 9, 9, the adhesive N5, which is the cured adhesive applied to the veneer veneer 2, and the heat Plastic resin film 3
It is possible to obtain a plywood 6 in which the veneer veneers 1 and 2 are adhesively laminated together with the adhesive layer 4 which is melted. At this time, the thermoplastic resin film 3 has a core layer 11 and a surface layer 12.
The heating is performed at a temperature 6 lower than the softening temperature of the resin of the core layer 11 and higher than the softening temperature of the resin of the surface layer 12. Core layer 1 in plastic resin film 3
1 is not softened and melted, but the surface layer 12 is softened and melted, and the adhesive layer 4 formed of the thermoplastic resin film 3 is bonded to the veneer veneers 1 and 2 by the fusion action caused by the softening and melting of the surface layer 12. Adhesion will be made. In this case, the thermoplastic resin film 3 is attached to the upper and lower veneer veneers 1, 1.
It is also possible to manufacture the plywood 6 by using it in the veneer veneer 2, but in this case, the thermoplastic resin film 3 is present in the upper and lower parts, and the steam generated from the veneer veneer 2 due to heating is absorbed by the heat. Since the steam is blocked by the plastic resin film 3 and cannot escape, it is recommended that the veneer veneer 2 be sufficiently dried or that the thermoplastic resin film 3 may be punctured. It is necessary to prevent this from happening. Further, in order to prevent such punctures of the thermoplastic resin film 3, a moisture absorbing additive may be added to the adhesive for producing plywood.

As this moisture absorbing additive, Niloid FM-20
Commercially available products such as 0 (manufactured by Mitsui Toatsu Chemical Co., Ltd.) and Hounen Glue N5IO1 (manufactured by Hounen Oil Co., Ltd.) can be used.
, In the case of Hounen Glue N, 5101, the adhesive is 7~
It is used by blending 10% by weight. By blending such a moisture-absorbing additive, the moisture generated from the veneer veneer is absorbed, thereby preventing punctures and the like from occurring in the thermoplastic resin film 3.

As described above, it is possible to obtain a composite plywood A in which the thermoplastic resin film 3 is integrally laminated between the veneer veneers 1 and 2. In order to bend this composite plywood A, first, as shown in FIG. a) Yomo+, -ak, mtM4Lh
MtnP7/l1-t, 2b1tJAl(xsAn)9
A V-shaped groove 8 is cut and applied to the J'*R side, and a groove 21 is further cut and applied to the veneer veneer 1 on the front side of the plywood 6.

The groove 21 may be formed in a V-shape or simply as a notch. Next, an adhesive is applied to the inner surface of the V-shaped groove 8, and the thermoplastic resin film 3 in the part of the V-shaped groove 8 is bent as a fulcrum as shown in FIG. 5(b).
(2) Glue the inner surfaces of the mold grooves 3 together to complete this bending process. By bending it in this way, it is finished as a drawer for a desk or chest of drawers, but since the veneer veneer 1 is exposed on the front side, the price of this veneer veneer 1 is a little expensive as mentioned above. Even so, it is better to use veneers that have a decorative effect, such as Agatis veneer or Merapi veneer. In addition, since the groove 21 portion will be exposed to the outside in an open state, it is better to reduce the thickness of the veneer veneer 1 to a certain extent so that the exposed area at the groove 21 portion is small. For example, The thickness of this veneer veneer 1 is set to about 0.5 to 2.0 mm.

Next, the present invention will be further explained by examples.

Example 1 As a thermoplastic resin film, an adhesive high pressure film with a thickness of 50 μm and a softening temperature of 83° C. was applied to both the front and back surfaces of a biaxially oriented polyethylene terephthalate film (Emblet: manufactured by Unitika) with a thickness of 50 μm and a softening temperature of about 240° C. A composite film laminated with a processed polyethylene film (Atomer LF305: manufactured by Mitsui Petrochemicals) was used. In creating such a thermoplastic resin film with a polyethylene terephthalate film as a core layer and a polyethylene film as a surface layer, each film is made of 40 dyn.
After corona discharge treatment under e/am conditions, a heat-resistant polyester-type urethane adhesive (
A-310) manufactured by Takeda Pharmaceutical Co., Ltd. was coated at a coating weight of 5 Fi/2 mm, dried, and polyethylene films were stacked on both sides of this polyethylene terephthalate film and passed through a roll to adhere each film.

On the other hand, as the veneer veneers, two 0.9 mm thick agathis veneers and three 3.6 mm thick lauan veneers were used, and 5% by weight of Ni-Uid FM-200 (manufactured by Mitsui Toatsu Chemicals) was used. Apply the urea-melamine co-condensed silicone adhesive to one side of each lauan veneer at a coating amount of 19 g/shaku 2, and
In addition to stacking three lauan veneers of +, each III board is further placed with Agatis veneers above and below it, and a thermoplastic resin film is placed between the upper A's Chis veneer and the lauan veneer below. Place this laminate between the upper and lower heating plates with f!
Set up in the same manner as shown in Figure S3 and heat at 115°C, 8K.
By heating and pressurizing the material under conditions of g/cm for 2.5 minutes, a composite plywood having a thickness of 12.6 mm and a size of 3×6 was obtained.

The composite plywood thus obtained is 9.7 cm long in the longitudinal direction.
Cut it to the width, paste the Agachiss veneer on the cut end surface with a wood edge binder, then perform the same cutting as shown in Fig. 5 (a), and then apply the same cutting as shown in Fig. 5 (b).
) to create a frame for a desk drawer.

Therefore, it had the appearance of being made of solid Agatis wood. In addition, in this product, the adhesive strength between the thermoplastic resin film and the agathis veneer and the lauan veneer was measured, and the tensile strength of the thermoplastic resin film was also measured. The adhesive strength between the thermoplastic resin film and the agathis veneer is 14.5 Kg/cm2, and the adhesive strength between the thermoplastic resin film and the lauan veneer is 13, OKH/am2.
All of them passed the plane tensile strength standard for special plywood specified by JAS. Further, the tensile strength of the thermoplastic resin film was 60 kg at 5 cm.

In Example 1, the adhesive was applied to one side of the lauan plywood, but if manufacturing is carried out using the normal plywood process in which adhesive is applied on both sides, as shown in Figure 7, the adhesive is applied to one side of the lauan plywood. .9mm thick and 1.8mmJW agathis veneer, 0
．． Using lauan veneers with a thickness of 9 mm, 2.8 mm, and 3°61, a 9 mm thick lauan veneer similar to Example 1 was placed between each 2.8 mm thick lauan veneer on both sides. A thermoplastic resin film similar to that in Example 1 was inserted, and the rest was carried out in the same manner as in Example 1 to obtain a composite plywood having a thickness of 12.8 mm.

In addition, a prayer bending process was performed in the same manner as in Example 1. Like the one in Example 1, this one also had the appearance of being made of solid agathis wood, and the same adhesive strength and tensile strength as in Example 1 were obtained.

[Effect of the invention 1 As mentioned above, in the composite pass of the present invention, the outermost veneer veneer and the inner veneer veneer are made of thermoplastic U.
(Since it is bonded with an adhesive layer made of fat film, it is possible to easily bend the thermoplastic resin film as a bending part by cutting etc., as well as bending the thermoplastic resin film as a bending part.) Since the surface is made of veneer veneer, the surface is covered with a natural wood veneer, and the thermoplastic resin film can be easily cut and bent. Despite that,
By using a veneer veneer on the surface, it is possible to create plywood that retains the natural wood feel. In addition, the composite plywood of the present invention is produced by disposing a thermoplastic resin film between the outermost veneer veneer and the inner veneer veneer among the plurality of veneer veneers, and adhering between the other veneer veneers. The thermoplastic resin film is manufactured by stacking each veneer veneer with the adhesive applied and then applying heat and pressure to bond the veneer veneers together. In the process of laminating and bonding veneer veneers to produce plywood, a thermoplastic resin film can be composited onto plywood. Composite plywood can be manufactured only by the process of manufacturing.

[Brief explanation of the drawing]

Fig. 1 is an enlarged cross-sectional view of a part of an example of the composite plywood according to the present invention, Fig. 2 is an exploded view showing one step in the production of the above composite plywood, and Fig. 3 is an exploded view of the thermoplastic resin film used in the above. Part of the enlarged sectional view, Figure f54, is a schematic diagram of the corona discharge device used in the above, and Figure 5(,')(b) is a sectional view showing the bending process of composite plywood. Figures 6(a) and (b) are sectional views of the conventional example, and Figure 7 is an exploded view showing one step in the manufacturing of composite plywood. 1.2 is a veneer veneer, 3 is a thermoplastic resin film, 4,
5 is an adhesive layer, 6 is a plywood, 10 is a composite film, 11 is a core layer, and 12 is a surface layer. Agent Patent Attorney Ashichi Ishida Figure 2 Figure 3 (b) 107 Immediately

Claims (5)

[Claims] (1) Plywood is formed by laminating and bonding multiple veneer veneers, and the outermost veneer veneer and the inner veneer veneer are bonded by an adhesive layer made of thermoplastic resin film. , a composite plywood characterized in that other veneer veneers are bonded together by an adhesive layer. (2) The thermoplastic resin film is a composite film in which the core layer is made of a high-strength thermoplastic resin and the surface layer is made of a highly adhesive thermoplastic resin. Composite plywood as described. (3) A state in which a thermoplastic resin film is placed between the outermost veneer veneer and the inner veneer veneer among multiple veneer veneers, and an adhesive is placed between the other veneer veneers. A method for manufacturing composite plywood, which is characterized by stacking individual veneer veneers on top of each other and applying heat and pressure to bond the veneer veneers together. (4) The thermoplastic resin film is a composite film in which the core layer is made of a high-strength thermoplastic resin and the surface layer is made of a highly adhesive thermoplastic resin. manufacturing method of composite plywood. (5) The softening temperature of the thermoplastic resin in the core layer is higher than the heating temperature during lamination, and the softening temperature of the thermoplastic resin in the surface layer is lower than the heating temperature during lamination. A method for manufacturing composite plywood according to claim 4.