JPH0119360B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention provides a method for disposing a large number of decorative thick-walled glass pieces in a frame, and filling a thermosetting adhesive between the glass pieces and between the glass pieces and the frame. Later, the present invention relates to a method for manufacturing a thick decorative board with glass pieces bonded thereto, in which a decorative board is manufactured by fixing the glass pieces to a frame by thermosetting the adhesive.

Prior Art When manufacturing this type of thick decorative board with glass pieces bonded, when the adhesive is heated to harden, the adhesive expands and hardens, but the frame is rigid and therefore effectively absorbs thermal expansion. Because of this problem, the adhesive was made of a material with a low melting point and low coefficient of expansion, such as epoxy resin, which had a low melting point and low coefficient of expansion.

Problems to be Solved by the Invention However, even if a material with a low expansion coefficient such as an epoxy resin is used, it is not perfect, and there are problems in which cracks may occur from small scratches on the glass pieces in some cases.

The purpose of the present invention is to solve the above-mentioned problems, and to provide a method for manufacturing a thick-walled decorative board bonded with glass pieces, which can effectively prevent cracking of the glass pieces due to thermal expansion during thermosetting of the adhesive. It is about providing.

Means for Solving the Problems In order to achieve the above object, the present invention embeds in an adhesive a thermal expansion absorbing member capable of absorbing thermal expansion during heat curing of the adhesive. The structure is such that the thermal expansion member absorbs the thermal expansion of the adhesive during thermal curing. That is, a plurality of transparent thick-walled glass pieces having at least a flat upper surface and decorative properties are arranged in the frame, and in the gaps between the plurality of glass pieces and the gap between the wall of the frame and the glass pieces. Filled with adhesive made of thermosetting synthetic resin,
After embedding a thermal expansion absorbing member that holds a compressible gas inside the adhesive, the adhesive is heated and cured, and the thermal expansion absorbing member absorbs the thermal expansion of the adhesive during thermosetting. Designed to absorb.

Effects and Effects of the Invention The method for manufacturing the glass piece adhesive thick wall decorative board according to the above configuration includes first arranging a plurality of transparent thick glass pieces having at least a flat upper surface and decorative properties in a frame, and then , Filling the gaps between the plurality of glass pieces and the gap between the frame inner wall and the glass pieces with an adhesive made of thermosetting synthetic resin, and retaining a compressible gas inside the adhesive. After embedding the thermal expansion absorbing member, the adhesive is heated and cured, and the thermal expansion of the adhesive during thermal curing is absorbed by the thermal expansion absorbing member.
Excessive thermal stress due to thermal expansion of the adhesive does not reach the glass pieces, and cracking of the glass pieces can be reliably prevented.

EXAMPLES The present invention will be specifically described below based on illustrated examples.

In FIG. 1, 1 is a rectangular frame, 2 is a transparent thick piece of decorative glass, and 3 is an adhesive made of thermosetting synthetic resin such as epoxy resin. A method for producing a thick-walled decorative board with adhesive glass pieces as an embodiment of the present invention includes arranging in a frame 1 a plurality of transparent thick-walled glass pieces 2 each having at least a flat top surface and having decorative properties; The gaps between the plurality of glass pieces 2 and the gaps between the inner wall of the frame and the glass pieces 2 are filled with an adhesive 3 made of thermosetting synthetic resin, and a compressible gas is introduced into the adhesive 3. After embedding a thermal expansion absorbing member to be held in the adhesive, the adhesive is heated to about 80° C. to harden, and the thermal expansion absorbing member absorbs the thermal expansion of the adhesive 3 during heat curing. do.

The glass piece 2 has a flat upper surface, and the other surface thereof is suitably provided with notches forming a plurality of substantially ripple-shaped, shell-shaped, or concentric steps. This stepped portion can be easily produced by applying a tool such as a chisel with a sharp tip to a part of the surface of the glass piece 2 and applying an impact to the tool with a hammer.

In addition, as shown in FIG. 2, a small diameter pipe 4 as the thermal expansion absorbing member is located at the center of the adhesive 3 in the thickness direction of the portion where the thermal expansion is large.
Many are buried. The pipe 4 is preferably made of vinyl or polyethylene-based synthetic resin that is transparent, has a melting point higher than that of the adhesive 3, has good adhesion to the adhesive 3, and has sufficient flexibility. It is more formed.
When the pipe 4 is buried in the adhesive 3, the viscosity of the adhesive 3 is adjusted so that the adhesive 3 does not penetrate into the inside too much, that is, so that a compressible gas such as air can be retained inside the pipe 4. Considering
For example, it is preferable to have a small diameter of about 2 to 10 mm in outer diameter, 0.5 to 1.0 mm in thickness, and 5 to 20 mm in length. In addition, the pipe 4 is mainly buried in a place where the expansion of the adhesive 3 is considered to be extremely large, and the volume ratio is determined when the volume of the adhesive 3 is V and the volume occupied by the pipe 4 (including the gas inside the pipe) is v. (v/v)
It is preferable to arrange so that the ratio is 1/10 to 1/10000.

An example of a method for arranging the pipe 4 at approximately the center of the adhesive 3 is to fill sand to about half the thickness of the frame 1, place the glass pieces 2 as appropriate, and apply a release agent to the upper surface of the sand. do. Then, an adhesive is poured from above and heated to harden to form the adhesive 3. After the adhesive has hardened, remove the sand, turn the frame 1 upside down, place the pipe 4 as appropriate on the hardened adhesive 3, and then pour the adhesive from above and heat it to harden. to form adhesive 3 and pipe 4
is held at approximately the center of the adhesive 3 in the thickness direction.

According to the manufacturing method of this embodiment, the glass piece 2 is placed inside the frame 1, and the adhesive 3 is filled between the glass piece 2 and the frame 1 and between the glass pieces. After burying the pipe 4, apply the adhesive 3 above.
When the adhesive 3 is heated to harden, the adhesive 3 gradually hardens, and as it thermally expands, it compresses the pipe 4, which has air trapped inside, from the outside. In other words, the pipe 4 absorbs thermal expansion and eliminates internal stress.

In addition, if the strength of the adhesive 3 decreases due to embedding the pipe 4 in the adhesive 3, it is recommended to strengthen it by stretching a wire 5 or the like inside the adhesive 3, as shown in Fig. 3. preferable.

Further, the thermal expansion absorbing member is not limited to a pipe, and a material capable of retaining compressible gas inside, such as a foamable urethane resin, can be used.

Furthermore, it goes without saying that the decorative board manufactured by the manufacturing method of this embodiment can be used not only for furniture such as table boards, but also for wall boards and the like.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a decorative board manufactured by a method for manufacturing a glass piece adhesive thick wall decorative board according to an embodiment of the present invention, and FIG. 2 is a vertical sectional view of the decorative board shown in FIG. 1.
FIG. 3 is a horizontal sectional view of the decorative plate of FIG. 1. 1... Frame body, 2... Glass piece, 3... Adhesive, 4... Pipe, 5... Wire.

Claims (1)

[Claims] 1. A plurality of transparent thick-walled glass pieces 2 having at least a flat upper surface and decorative properties are arranged in a frame 1, and gaps between the plurality of glass pieces 2 and the frame After filling the gap between the internal body wall and the glass piece 2 with an adhesive 3 made of thermosetting synthetic resin, and embedding a thermal expansion absorbing member 4 that holds compressible gas inside the adhesive 3, A method for manufacturing a thick-walled decorative board with a piece of glass bonded, characterized in that the adhesive 3 is heated and cured, and the thermal expansion of the adhesive 3 during thermosetting is absorbed by the thermal expansion absorbing member 4. . 2. The method for manufacturing a thick-walled decorative board with glass pieces bonded thereto according to claim 1, wherein the thermal expansion absorbing member is a pipe 4. 3. The method of manufacturing a thick decorative glass piece adhesive board according to claim 1, wherein the thermal expansion member is made of a foamable urethane resin.