JPS6333456B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a composite board in which a synthetic resin foam is integrally interposed between a hard base material and a seal-like material.

[Conventional technology]

Conventionally, for example, the end faces of 3 mm thick plywood are brought into contact, the abutting parts (joint parts) are covered with tape, and then a liquid polyurethane foam raw material is discharged, and then kraft paper is laminated on this raw material. The foam raw material is reacted and foamed in the mold to a thickness of approx.
A continuous strip of 15 mm sandwich structure was made, and this was cut into plywood lengths at the exit of the mold to produce composite boards of fixed length at a speed of about 7 to 10 mm/min.

[Problem to be solved by the invention]

However, this type of method for manufacturing composite plates has the following drawbacks. In other words, when a hard base material of a fixed length is brought into contact with the material, the foam material leaks to the end surface of the base material through the gaps in the abutted area (joint area), which not only increases costs and defective rates, but also reduces the composite material that becomes the product. The appearance of the end surface of the board lowered its commercial value and also caused problems during construction. Furthermore, the joints were manually covered with adhesive tape, which was inefficient.
In particular, if the shape of the joint is complicated or the tape is attached over a long distance, it is difficult to accurately attach the tape to these substrates that are moving at high speed. Furthermore, when cutting a composite band that is a continuous band with the length of the hard base material into a fixed length of the length of the hard base material, a person checks the joints and inserts a cutter into the joint to cut the sheet-like material. The process involved cutting the foam and adhesive tape to create a composite plate, which had disadvantages in terms of speed, cost, and appearance.

[Means to solve the problem]

In order to eliminate such drawbacks, the present invention discharges viscous granules onto the joints where the end surfaces of the hard base material are in contact with each other.
The shape of joints can be changed by effectively utilizing the greatest property of hot melt adhesive and sealant, which can be thinned in a short time.
In addition to sealing without being affected by air gaps, a detection filler is mixed into the sealing material to improve the sealing area mechanically, electrically, optically, thermally, magnetically, etc.
The joints are reliably detected by acoustics, color difference, etc., and the joints are cut to ensure a fixed-length composite board with beautiful end faces, and the form is sufficiently formed without leakage to other parts of the form. This paper proposes a method for manufacturing a composite plate that exhibits the following functions.

〔Example〕

An embodiment of the method for manufacturing a composite plate according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is an explanatory diagram showing a state in which the joints that occur when the end faces of a fixed-length hard substrate are brought into contact with each other are covered (sealed) with a hot-melt adhesive and sealing material. (hereinafter simply referred to as hard base material), for example, plywood, gypsum board, metal molded board, etc. Reference numeral 2 denotes a joint portion, which is a connection portion that occurs when the end surfaces of the hard base material 1 are brought into contact, and there is a gap 2a between the end surfaces.
is likely to occur. Reference numeral 3 denotes a thin film body that functions as a hot melt adhesive and a sealing material, and as shown in FIG. The length Δt of the thin film body 3 is
For example, the width is about 0.5 to 1 mm, and the width ΔW is about 10 mm. To explain further, the cross section of the thin film body 3 consists of two components, an adhesive component 4 and a detectable filler 5, as shown in an enlarged view in FIG. The adhesive component 4 includes coumaron indene resin, rosin and its fusion, mineral-based, vegetable-based, petroleum-based wax, alkyd resin, phenolic resin, coal tar pitch, ethyl cellulose, vinyl acetate resin, polyethylene, ethylene-vinyl acetate. copolymers, butyl methacrylic resins, polystyrene and copolymers,
Polyisobutylene, petroleum resin, polypropylene,
These include polyamide resin, polyester resin, ethylene dipolymer, and phenoxy resin. Further, the detectable filling 5 may be mechanical, electrical, optical, thermal, magnetic, acoustic, color difference, etc.
It consists of piezoelectric, ultrasonic, thermal, and other properties that exhibit two or more of these characteristics, and it mainly does not react with the adhesive component 4 and has a shape such as a powder or a neighboring piece. , granular, etc. Further, the mixing ratio of the filler 5 and the adhesive component 4 varies depending on the performance of the detector, the physical properties of the hard base material 1, and the transport speed thereof. More specifically, the filler corresponding to the above is one whose hardness and unevenness can be detected by a detector described later, and includes, for example, cement, pearlite grains, etc. The electrical signal of the detector reacts sensitively to good conductors and bad conductors, and the electrical characteristics of other parts clearly change.For example, the former includes silver powder, copper powder,
The latter include minerals, glass, ebonite, asbestos, sulfur, rubber, nitrogen, and ceramics.
Another example is the detection of reflectance and translucency, such as aluminum powder, calcite, crystal, etc., and the detection of thermal conductivity.
For example, metal powder, ceramic powder, etc. There are noticeable changes in magnetism, such as iron, nonferrous metals, magnetic steel, and ceramics, and there are changes in sound absorption and insulation properties, such as lead powder, pearlite grains, and silica. powder etc. Furthermore, the measurement is carried out using a color difference meter or the like, and for example, it is possible to detect slight piezoelectric changes using barium titanate, Rotsusil salt, etc.
The device measures changes in the received ultrasonic signal and detects the position, and is made of a dielectric, an insulator, etc., and the material changes color depending on temperature, such as a liquid crystal. Reference numeral A denotes a frame material, which is made of one type such as a steel belt, a caterpillar, or a roller, and is moved in one direction, for example, in the direction of the arrow, with the hard base material 1 placed thereon, by a drive unit (not shown). 6 is the detectable filling 5 described above with a detector.
It has a function of detecting a continuous band having a sanderch structure, and serves as a signal source for cutting the continuous band at a position detected by a cutter (not shown) in one length of the continuous band hard base material. A core material 7 is made of a synthetic resin foam, as shown in FIG. A liquid raw material such as polyurethane foam, phenol foam, etc. is discharged onto the hard substrate 1 using a one-shot method such as a spray gun, and a sheet material 8 such as kraft paper is laminated thereon and reacted in a cure oven. The core material 7 is formed by foaming and curing, and also functions as an adhesive, a heat insulating material, and a bulking material.

Therefore, assuming that a composite board with such a configuration is to be manufactured, the hard base material 1 is 1800 mm long x 900 wide x
Using plywood with a thickness of 7 mm, the component ratio of 100 g of sealing material is vinyl copolymer (70 g) as adhesive component 4, iron powder (30 g) as detectable filler 5, Δt = 0.5 mm, Apply with a spray gun so that ΔW = 10 mm. Further, a polyurethane resin was prepared as the synthetic resin foam raw material for the core material 7, kraft paper was prepared as the sheet-like material 8, and a proximity switch as the detector 6 was prepared near the outlet of the cure oven (not shown). Therefore, the plywood 1 is placed on the mold A with its end surfaces in contact with each other as shown in FIG.
is discharged to form a thin film body 3 as shown in FIG. Note that this sealing material had a pot life of 3 seconds. Next, polyurethane resin is discharged onto plywood 1, and kraft paper 8 is placed on this raw material.
After laminating the materials, the raw materials are sandwiched between the plywood 1 and the kraft paper 8 between the upper and lower molds built in so as to be rotatable using a cuy open (not shown), and are then fed to the rear of the exit of the kyu bun (not shown). The thin film body 3 is detected by the mounted proximity switch 6, the joint part 2 is cut by a running cutter (not shown), the continuous composite strip is cut to the length of the plywood 1, and a predetermined composite board is cut. It's something you get. In addition, the hard base material 1 is a color steel plate (thickness 0.27 mm) formed as shown in Fig. 4 and has a length of 3030 mm, and the end surface of the hard base material 1 is abutted, and this abutting part (joint part 2) is sealed. After that, the composite board is manufactured using the same steps as described above. In addition, when the hard base material 1 was a colored steel plate, a vinyl copolymer was used as the sealing material and red iron was used as the detectable filling 5, so that a color mark sensor was used as the detector 6.

What has been described above is only one embodiment of the present invention,
This sealing thin film can also be detected using a laser beam, an ultrasonic flaw detector, or by measuring whether or not the film is glossy.

〔Effect of the invention〕

As described above, according to the method for manufacturing a composite board according to the present invention, the joint portion where the end surface of the hard base material is in contact can be easily sealed with a thin film regardless of the shape and material of the fixed length hard base material. At the same time, this sealing part can be detected reliably, the core material raw material will not leak to each end face of the hard base material, each end face can be formed beautifully, and it can also handle mass production as it can sufficiently handle the production speed. It has characteristics.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the main parts of the method for manufacturing a composite board according to the present invention, FIG. 2 is an enlarged sectional view showing an example of a thin film body, FIG. 3 is a perspective view showing an example of a composite board, and FIG. The figure is a perspective view showing another example of the hard base material. 1... Fixed length hard base material, 2... Joint area, 3...
Thin film body, 6...detector.

Claims (1)

[Claims] 1. At a constant speed, hard base materials of a fixed length are placed in series with their end surfaces in contact with each other on a mold that moves in one direction, and the synthetic resin foam raw material that will become the core material is placed on the hard base material placed on the mold. When manufacturing a composite plate of a fixed length by discharging the raw material, laminating a sheet-like material on top of the raw material, reacting and foaming it into an integrally formed continuous belt, and cutting this into a fixed-length composite plate, each of the above-mentioned base materials is A hot-melt adhesive/sealant containing a substance that can be detected by a detector is applied using a viscous flow to the voids (joints) formed by the contact of the materials, and is cured in a short time to form a thin film. After that, the raw material is discharged onto the hard base material surface on which the thin film body is present, and the continuous band having a composite structure is coated with the sealing material by a detector. A method for manufacturing a composite board, characterized in that the composite board is cut by cutting the hard base material length.