JPH02279335A - Preparation of composite panel and spacer used therein - Google Patents

Abstract

PURPOSE:To prevent the generation of product inferiority by closely filling the space between surface materials with a foamed resin by venting the gas generated by the injection foaming of an on-the-spot foamed resin or the air in a space through the slit formed to a spacer. CONSTITUTION:After spacers 1, 2 and, if necessary, support pieces 6 are arranged, one surface material 3 and a lower surface material 3 are applied in opposed relationship so as to hold said spacers and the support pieces therebetween. Subsequently, an on-the-spot foamed resin is injected in the space 4 formed between the surface materials 3 from the hole 7 formed to the spacer 2 to be foamed. The gas leaking in the space 4 from the foamed resin is vented to the outside along with the air present in the space 4 from the slits 5 formed to the spacer 1 from the beginning. The foamed resin is allowed to fill the space 4 and solidified to obtain an integrated composite panel. By this method, the composite panel having the foamed resin uniformly spread between the surface materials 3, 3 thereof and having no flaw can be certainly prepared.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to doors and housings of equipment that require heat insulation, such as food showcases, commercial refrigerators, automatic juice printing machines, etc. In addition to materials, this invention also relates to a method for manufacturing composite boards that can be used as building doors, partition panels, etc., and spacers used therein. More specifically, the present invention relates to a method for manufacturing a composite plate having a core material of a resin foamed in place such as rigid foamed polyurethane, and a spacer used therein.

[Conventional technology] Conventionally, composite boards used for the above-mentioned purposes are made by using a stainless steel plate or the like as a facing material, and injecting and foaming a foamed-in-place resin between two facing materials facing each other with a spacer in between. Manufactured by

To explain this more specifically, for example, in manufacturing a rectangular composite board for constructing a food showcase, spacers made of ice cube material are arranged along two opposing sides of a rectangular panel. In the space between the facing materials with this spacer in between, cover the remaining two sides not covered by the spacer with adhesive tape, and then inject foamed-in-place resin through the hole made in the center of the spacer. ing.

” - When the injected foamed resin injected as described above solidifies, its adhesive strength will firmly integrate the two face materials and the spacer with one finger of solidified foamed resin as the core material.
After removing the adhesive tape, it is sent out as a product.

[Problems to be Solved by the Invention] However, in the case of the above-mentioned conventional manufacturing method, the gas generated by the injection and foaming of the in-situ foamed resin remains in the space between the facing materials, leaving unfilled portions of the foamed resin in the space. There is a problem in that the product is easily produced with defects in insulation properties, etc.

In other words, in the conventional manufacturing method, gas and air generated by injection and foaming of in-situ foamed resin are trapped in the small gap left between the spacer and the facing material, or in the holes made in the spacer for injection of in-situ foamed resin. You will be running away from such things. However, this is often insufficient, as the pressure in the space between the first side materials becomes higher than the foaming pressure, which prevents the expansion of the foamed resin and makes it difficult for the foamed resin to spread to every corner, resulting in the above problem. It is something that exists.

The present invention has been made in view of the above-mentioned problems, and provides a method for reliably producing a defect-free composite board in which the foamed resin is spread throughout the space between the facing materials, and a special spacer for use in the method. be.

[Means for Solving the Problems] As shown in FIGS. 1 and 2, in the invention of claim 1, between the facing members 3 with spacers 1.2 interposed in the periphery, When manufacturing a composite board by injecting in-situ foamed resin into the space 4 of the spacer 1, at least a portion of the spacer 1
A slit 5 is formed in the upper part of the space 3 to communicate the inside and outside of the space 3, and the gas and air generated by injection and foaming of the in-situ foaming resin are passed through the slit 5 to the space 4.
They are taking measures to release it to the outside.

The material of the spacers 1 and 2 is not particularly limited as long as the space 4 can be maintained between the face members 3, and in addition to the foamed resin described below, for example, wood, non-foamed resin, rubber, etc. can be used. However, from the viewpoint of ease of forming the slits 5, the spacer 1 having the slits 5 is preferably formed by forming a slit across a long surface of a long rectangular member made of foamed resin.

In the present invention, only the spacer 1 having the slit 5 can be used, but the spacer 1 made of the above-mentioned foamed resin
If you use spacer 2 for only one part and the other part is a structural member, the strength of the resulting composite board will be
1: Preferable.

The spacer 2 serving as the structural member is made of a material with high strength, such as wood.

As the facing material 3, for example, a metal plate such as a stainless steel plate, a colored steel plate, a vinyl chloride steel plate, an aluminum plate, a resin plate such as an FRP plate, a vinyl chloride plate, an acrylic plate, a polypropylene plate, a wood plywood, or a composite board of these. etc. can be used.

The shape of the facing material 3 is determined as appropriate depending on the application.
It may be not only a rectangle or a polygon with straight sides, but also a curved shape such as a circle or an ellipse, or a mixture of straight and curved shapes.

Examples of the in-situ foamed resin used in the present invention include rigid polyurethane foam, phenol foam, urea foam, and epoxy foam. These may be cross foamed or non-frosted foamed.

As cross foaming, there is a method in which fluorocarbon gas is mixed into polyol or polyisocyanate and the mixture is discharged in the form of foam using a cross foaming machine. As the non-frosting foaming method, there is a method in which a mixture of polyol, polyisocyanate, and a blowing agent is discharged in a liquid form using a non-frosting foaming machine.

Moreover, as shown in FIG. 3, in the invention of claim 4, the spacer 1 for manufacturing a composite plate is made of a long square material and has a slit 5 that crosses the long surface thereof. This measure is being taken.

The spacer 1 according to the present invention has a space 4 between the upper and lower side members 3.
There is no particular restriction on the material as long as it can maintain the slit 5, but it is preferably made of foamed resin.If it is made of foamed resin, not only will it be easier to form the slit 5, but it will also be easier to handle due to its weight reduction. It is possible to improve this and provide heat insulation properties to the spacer 1.

The foamed resin is preferably a hard or medium-hard one, specifically, extruded foamed polystyrene, beaded foamed polystyrene, foamed polystyrene, foamed polypropylene,
Examples include foamed polyvinyl chloride, bead foamed polymethyl methacrylate, and rigid foamed polyurethane. In particular, when providing spacers l along the curved sides of the facing material 3, it is preferable to use "Styroflex" (trade name) manufactured by Dow Chemical Co., Ltd., which is a specially processed extruded polystyrene foam, in order to provide appropriate flexibility. .

The width of the slit 5 is preferably about 0.5 to 2.51 mm from the viewpoint of good air permeability and prevention of foamed resin flowing out.Also, in order to obtain good air permeability, the total height of the spacer 1 It is preferable that the depth is 172 or more.Furthermore, in order to provide uniform air permeability to the entire spacer l,
It is preferable that a large number of them are formed at approximately equal intervals, and the intervals are as follows.

Depending on the strength of the constituent material of spacer 1, 5 to 50 m
About m is preferable.

[Function] In the invention of claim 1, the gas generated by injection and foaming of the in-situ foaming resin and the air existing in the space 4 from the beginning are released through the slit 5 formed in the spacer 1. This gas or air remains in the space 4 to prevent the pressure in the space 4 from becoming higher than the foaming pressure (movement).

Moreover, the reason why the slit 5 is formed in the upper part of the spacer 1 is to maintain the above-mentioned degassing effect until the space 4 is completely filled with the foamed resin.

In the invention as claimed in claim 4, the slit 5 is used to hold the gas and gas generated when the face materials 3 are faced to each other with the spacer 1 in between and the in-situ foaming resin is injected and foamed into the space between the one and the face materials 3. Acts as an escape route for air or air.

[Example] First, the manufacturing method according to the present invention will be explained with reference to FIGS. 1 and 2.

The member 3 in this embodiment is rectangular, and first, the lower face material 3
and place spacer 1.2 around it.

The spacer 1 is made of a long square piece of foamed resin with a slit 5 formed across its long surface, and the spacer 2 is made of wood and serves as a structural member. In particular, as shown in the drawing, when spacers 1 are placed on two opposing sides of member 3 and spacers 2 are placed on the other two sides, the strength of the composite plate obtained is due to the interposition of spacers 2, which serve as structural members. 6. The spacer 1.2 may be simply placed along the edge of the lower surface material 3, but the spacer 1, which is particularly light and tends to shift, may be attached with an adhesive or adhesive. It is preferable to do so because it prevents slippage during work and makes subsequent work easier.

In addition, if the center part of the upper panel 3 bends when the panel 3 is further stacked on the spacer 1.2 because the panel 3 is large, a support piece 6 should be placed at the center of the panel 3. It is preferable to provide this support piece 6 as a spacer 1 made of foamed resin, which can be easily cut into short pieces, so it is preferable to use these pieces because it saves the trouble of preparing a special support piece 6. .

After arranging the spacer 1.2 and, if necessary, the support piece 6 as described above, another sheet 3 is placed over the lower sheet 3 so as to sandwich them therebetween.

Next, in the space 4 between the facing materials 3 thus formed,
In-situ foaming resin is injected and foamed through a hole 7 previously formed in one spacer 2.

At this time, the gas leaking into the space 4 from the foamed resin is released from the slit 5 formed in the spacer 2 together with the air that has been present in the space 4 from the beginning, and while this gas and air are being discharged, By filling the space 4 with foamed resin and making it individual, a strongly integrated composite board can be obtained.

All the foaming gas from the foamed resin is incorporated into the foamed resin,
When this gas does not leak into the space 4, only the air existing in the space 4 from the beginning will escape through the slit 5.

Next, an embodiment of the spacer 1 according to the present invention will be described with reference to FIG.

As shown in the figure, one spacer 1 is a long rectangular piece made of foamed resin, with a large number of slits 5 formed at equal intervals across the long surface thereof.

This slit 5 may be formed by molding,
It may be formed by cutting.

As mentioned above, this spacer 1 is placed around the one-sided material 3, and in order to make it easier to position it when placed, the back side of the side where the slit 5 is formed has an adhesive 8 and a mold release material. It is preferable to provide the sheets 9 one after another.

FIG. 4 shows another embodiment of the spacer 1, in which slits 2 are formed in the shape of a base grid on one side of a foamed resin plate. In this case, by dividing each row along the vertical or horizontal slits 5, one divided row can be used as the spacer 1. That is, in this embodiment, one of the vertical and horizontal slits 5 is used as a cut for dividing, and the other is used for ventilation during manufacturing of the composite board.

With such a plate shape, it becomes easier to prevent the spacer l from breaking at the slit 5 portion during transportation.

In the present plate-shaped spacer 1, it is preferable to make one of the vertical and horizontal slits 5 deeper than the other and use this for dividing, since this makes it easier to divide each row. As described above, it is preferable to sequentially provide an adhesive 8 and a release sheet 9 on the back side of the surface on which the slits 5 are formed.

FIG. 5 shows another embodiment in which the slit 5 is formed, and as shown in (a), the width of the slit 5 is gradually increased from one end to the other end.

The slit 5 having the shape "-" is advantageous when the spacer 1 is provided in a curved manner along the curved side of the face material 3. That is, as shown in (b), when the slit 5 is curved with the wide side inward, the wide side is compressed as the slit 5 is curved, and conversely, the narrow side is pushed and expanded. Therefore, the width of the slits 5 after installation can be made almost uniform, and good ventilation can be exhibited.

[Effects of the Invention] The present invention is as described above, and has the following effects.

(1) According to the invention of claim 1, it is possible to fill the space between the face materials 3 with the foamed resin without any gaps, and it is possible to prevent product defects due to unfilled portions remaining.

(2) According to the second aspect of the invention, the strength of the resulting composite plate can be increased by interposing the spacer 2 as a structural member.

(3) According to the invention set forth in claim 3, it is possible to prevent the central portion of the large face material 3 from bending without the trouble of preparing a special support piece 6.

(4) According to the invention of claim 4, the invention of claim 1 can be easily implemented.

(5) According to the invention of claim 5, the spacer l is easy to manufacture and is light and easy to handle.

Furthermore, the spacer 1 can also have heat insulating properties.

(6) According to the invention set forth in claim 6, it is possible to prevent the slit 5 from collapsing due to curving when installing on a curved portion.

(7) According to the invention set forth in claim 7, cracking of the spacer l during transportation can be easily prevented.

(8) According to the invention of claim 8, it is possible to easily prevent the spacer 1 from shifting during work.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of one embodiment of the manufacturing method according to the present invention, FIG. 3 is a perspective view showing one embodiment of the spacer according to the present invention, and FIG. 4 is another embodiment of the spacer. FIGS. 5(a) and 5(b) are perspective views showing other embodiments of the slit. , 2: Spacer two-sided material: Space Nislit: Support piece: Hole: Adhesive: Release sheet

Claims (1)

[Claims] 1) When manufacturing a composite board by injecting a foamed-in-place resin into the space between facing facing materials with a spacer interposed in between, the above-mentioned A method for manufacturing a composite board, characterized in that a slit is formed to communicate the inside and outside of the space, and gas and air generated by injection and foaming of a foamed-in-place resin are released to the outside of the space through the slit. 2) The face material is rectangular, spacers that serve as structural members are placed on two opposing sides, and slits are formed across the long surface of the long rectangular foamed resin material on the remaining two opposing sides. 2. The method of manufacturing a composite plate according to claim 1, further comprising arranging the formed spacers. 3) A spacer formed by forming a slit across the long surface of a long rectangular piece made of foamed resin is cut into short pieces, and these pieces are interposed in the center of the face piece as supporting pieces. A method for manufacturing composite boards. 4) A spacer for manufacturing a composite plate, which is a long square material and has a slit formed across its long surface. 5) The spacer for manufacturing a composite board according to claim 4, characterized in that it is made of foamed resin. 6) The spacer for manufacturing a composite plate according to claim 5, which has flexibility in the longitudinal direction and has a slit width that gradually increases from one end to the other end. 7) A spacer for manufacturing a composite board, characterized in that slits are formed in the shape of a base grid on one side of a foamed resin board. 8) The spacer for manufacturing a composite plate according to claim 5 or 7, wherein an adhesive and a release sheet are sequentially attached to the back surface of the surface where the slits are formed.