JPH03193408A - Production of ligneous building material - Google Patents

Abstract

PURPOSE:To promote hardening of an adhesive and to shorten a pressing time necessary for bonding by mixing a hardening promoter in order to promote hardening of the adhesive which is utilized for bonding a ligneous decorative veneer on the ligneous base material in the production stage of the ligneous decorative veneer. CONSTITUTION:In the case of producing the ligneous building material by applying an adhesive to the lumber flakes 1 and making them to a block by clamping, molding and slicing the formed flitch 3 and bonding the obtained ligneous decorative veneer 5 on the ligneous base material 11 by the adhesive 12, a hardening promoter is mixed in order to promote hardening of the adhesive 12 which is utilized for bonding the ligneous decorative veneer on the ligneous base material 11 in the dyeing stage of the lumber flakes 1 in the production process of the ligneous decorative veneer 5. As the hardening promoter, for example when the adhesive 12 utilized for bonding the ligneous decorative veneer on the ligneous base material 11 is the urea-vinyl acetate based adhesive 12, an ammonium chloride soln. is utilized. Thereby hardening of the adhesive penetrated into the ligneous decorative veneer is promoted by the hardening promoter mixed therewith and therefore a pressing time can be shortened.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention is a wood decorative veneer that is formed by pressing and forming a thin piece of wood into a block using bindu as an adhesive, and then slicing the block-formed flitch. The present invention relates to a method for producing a wooden building material by bonding the material onto a wooden base material with an adhesive.

[Prior Art] The applicant of the present invention has already filed a patent application in 1982 for manufacturing decorative wooden veneers by press-molding wood thin pieces into blocks using pine glue as an adhesive and slicing the block-formed flitches. The application has been filed as No.-211756. Then, this wooden decorative veneer is adhesive-pressed onto a wooden base material such as plywood using an adhesive to produce a wooden building material.

[Problem to be Solved by the Invention 1] By the way, when producing wooden construction materials by IIN pressing a wooden decorative veneer onto a wooden base material such as plywood with an adhesive as described above, the bonding time is There is a problem in that the pressing time is long and the manufacturing time cannot be shortened. Therefore, there is a method of adding a curing accelerator to the adhesive, but there is a problem that the pot life of the adhesive is shortened, resulting in poor workability.

The present invention was devised in view of the problems of the conventional methods described above, and its purpose is to create a wooden construction material that can accelerate the curing of adhesives and shorten the pressing time required for bonding. To provide a manufacturing method.

[Means for Solving the Problems] The method for manufacturing a wooden building material of the present invention is obtained by slicing a flitch 3 formed by applying an adhesive to a thin piece of wood 1 and forming it into a block by compression molding. Wood decorative veneer 5
Adhesive used to adhere the decorative wood veneer 5 to the wooden base material 11 in the manufacturing process of the decorative wood veneer 5 when bonding the decorative wood veneer 5 to the wooden base material 11 to manufacture the wooden construction material. The VT feature is the mixing of a curing accelerator to accelerate the curing of the agent 12, and by adopting such a method, the problems of the above-mentioned conventional examples are solved.

[Function] Therefore, in the process of manufacturing the decorative wood veneer 5, the decorative wood veneer 5
By mixing a curing accelerator for accelerating the curing of the adhesive 12 used to bond the wood base material 11 to the wood decorative veneer 5, the adhesive 12 that has permeated into the wood decorative veneer 5 is mixed into the wood decorative veneer 5.
The curing accelerator mixed into the material accelerates curing, making it possible to shorten the pressing time.

[Example] The present invention will be described in detail below based on examples.

The decorative wood veneer 5 used in the present invention is manufactured as follows. That is, as shown in FIG. 1, a thin piece of wood 1 obtained by slicing wood is first dyed, then dried, an adhesive is applied to the thin piece of wood 1, and then the thin piece of wood 1 is pressed and formed using a press device 2. The flitches 3 are then sliced by a slicing blade 4 to form a wood decorative veneer 5. As shown in Fig. 2, the wood thin piece 1 has a thickness L of 0.05 to 0.80s+i* (preferably 0°10-0.50m5) and an area of 6-40m5.
06-4O0 is preferably 25-250+a theory 2), and the aspect ratio (vertical width a/width b) is 0.4-7.0 (preferably 0.8-3.0). These wood flakes 1 may be twisted. Further, as long as the above-mentioned shape is 60% or more, there is no problem even if dimensions other than the above are mixed in.

Chemical treatments include dyeing treatments, insect repellent treatments, antiseptic treatments, and flame retardant treatments. For example, the dyeing process is carried out in the dyeing tank 6 as shown in Fig. 1. ! ! This is done by dipping the inner basket 8 containing the wood flakes 1 into the container 7. The adhesive is applied to the wood slices 1 by spraying or kneading.

The type of adhesive is not particularly limited as long as it has a hardness that allows slicing after adhesion, but the following adhesives are considered suitable. Examples include urethane adhesives, urethane adhesives, soft polyester resins (elongation rate of 40% or more), vinyl acetate adhesives, and the like. Pressure forming of the thin wood piece 1 coated with adhesive is carried out by a press device 2, and as shown in FIG. The pressure applied by this press device 2 is sufficient to crush the wood flakes 1 along the press surface, and is 2 Kg/
am2-25 Kg/cm' (preferably 7Kg/cm')
Cm2-14 Kg/c2).

The decorative wood veneer 5 obtained as described above is a curing accelerator for accelerating the curing of the adhesive 12 used for adhering the decorative wood veneer 5 to the wood base material 11 described later in the above manufacturing process. is mixed in. That is, the curing accelerator is mixed in, for example, when the wood slice 1 is dyed. As the curing accelerator, for example, when the adhesive 12 that adheres to the wooden base material 1 is a urea vinyl acetate adhesive 12, an ammonium chloride solution is used.

Therefore, in the present invention, a wooden building material is manufactured by bonding the decorative wooden veneer 5 obtained as described above onto a wooden base material 11 such as plywood with an adhesive 12 and pressing it. However, there is adhesive 1 on the wood decorative veneer 5.
Since the hardening accelerator 2 is mixed, when the adhesive 12 is applied to the surface of the wooden base material 11 as shown in FIG. , adhesive 12
The hardening is accelerated by the hardening accelerator mixed into the wood decorative veneer 5, thereby shortening the pressing time. In particular, the wood decorative veneer 5 used in the present invention is obtained by slicing the flitch 3 formed by applying adhesive to the wood thin piece 1 and forming blocks by pressure molding. A void is formed, and when the decorative wood veneer 5 is bonded, the adhesive 12 penetrates into this small void and fills the small void, but the adhesive 12 in this area is also mixed into the decorative wood veneer 5. Curing is accelerated by a curing accelerator.

Specific examples and comparative examples will be described below.

<Example> A wooden decorative veneer 5 obtained by slicing a flitch 3 formed by applying an adhesive to a thin wood piece 1 and forming blocks by pressure molding is placed on a wooden base material 11 with an adhesive 12. 10 to 20% in the dyeing process of the wood thin pieces 1 during the manufacturing process of the decorative wood veneer 5.
% ammonium chloride solution (the amount added is equivalent to about 10% of the amount of adhesive 12 applied). Next, the wooden decorative veneer 5 obtained as described above was pressed with an area-vinyl acetate adhesive 12 at 110 to 120°C for 40 seconds to obtain the intended wooden building material.

<Comparative Example> A decorative wood veneer 5 was produced in the same manner as in the example without adding ammonium chloride solution, and this decorative wood veneer 5 was coated with an area-vinyl acetate adhesive 12 of 110 to 12
A pressing time of 60 seconds was required to obtain the desired wooden building material by pressing at 0°C.

[Effect of the invention 1 As described above, the present invention is to apply adhesive to a thin piece of wood and press-form it into a block, and then slice the flitch. A curing accelerator for accelerating the curing of the adhesive used to bond decorative wood veneers to wood base materials in the manufacturing process of decorative wood veneers when bonding them with adhesives to produce wooden construction materials. This has the advantage that the curing of the adhesive that has penetrated into the decorative wood veneer is accelerated by the curing accelerator mixed into the decorative wood veneer, thereby shortening the pressing time.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the manufacturing process of one embodiment of the present invention, FIG. 2 is an enlarged perspective view of the same wood thin piece, and FIGS.
) are cross-sectional views showing the wood decorative veneer before and after adhesion, in which 1 is a wood thin piece, 3 is a flitch, 5 is a wood decorative veneer, 11 is a wood base material, and 12 is an adhesive. Figure 2

Claims (1)

[Claims] [1] A wood building is created by gluing a wood decorative veneer onto a wood base material with an adhesive, which is obtained by slicing a flitch that is formed by applying an adhesive to a thin piece of wood and forming it into a block by pressure molding. A wood material characterized by mixing a curing accelerator to accelerate the curing of the adhesive used to bond the decorative wood veneer to the wood base material during the manufacturing process of the decorative wood veneer. Method of manufacturing building materials.