JPH0237296B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing siding boards (hereinafter simply referred to as boards) useful as exterior materials for buildings and structures. In particular, the present invention relates to a method of manufacturing a board in which an aggregate-containing foam having high impact resistance, heat insulation properties, and adhesive properties is formed on the back surface of the bent portion of the female connection structure of the board.

Conventional boards of this type generally have a structure in which plastic foam is interposed between the front surface material and the back surface material. In addition, the manufacturing method for this type of board was to discharge a foam raw material onto the surface material, to laminate the back surface material thereon, and to cure it while molding it with a mold. However, with this manufacturing method, the surface material is concave,
In addition, when a plastic foam having a bulge is formed on the bent portion of the female connecting structure as shown in FIG. 1, a portion of the plastic foam is not sufficiently filled at the side edges, particularly at the bent portion. There was a drawback that it was in a so-called underdeveloped state. In addition, since this type of board is installed by fixing it to the body frame etc. with nails, it is necessary to hammer the bent part of the female connection structure with a hammer, etc., and the impact at that time may cause the The foam structure of plastic foam, phenol foam, vinyl chloride foam, etc. is destroyed and cannot be restored, resulting in poor insulation and
Water resistance was often significantly reduced. Furthermore, since the part into which the nail is driven is simply plastic foam, it is elastic and difficult to drive, which further reduces work efficiency. In addition, when the core material is made of plastic foam alone, the reaction, foaming rate, and accompanying foaming pressure, viscosity, and temperature rapidly increase, which not only reduces effective foaming, but also causes damage to the front and back materials. There was a drawback that the plastic foam raw material leaked from the side edges to the outside or to the surface of the surface material, leading to increased costs.

In order to eliminate these drawbacks, the present invention uses a composite structure for the plastic foam on the back side of the bent part of the female connection structure to improve impact resistance, heat resistance, and waterproofness, as well as improve workability and reduce costs. This paper proposes a method for manufacturing a board that achieves this.

An embodiment of the board manufacturing method according to the present invention will be described in detail below with reference to the drawings. Figures 2a and 2b are a side view and a plan view schematically showing the apparatus used to carry out the above manufacturing method, in which 1 is a band-shaped metal hoop material (hereinafter simply referred to as hoop material) which is continuously fed out from an uncoiler 2. and fed to the molding machine 3, where it is bent into the cross-sectional shape shown in FIG. 3a. That is, in Figure A, the left and right ends of the hoop material in the longitudinal direction are bent, respectively, to provide bent portions 4 and 5 of a male and female type connection structure, and a recessed portion 6 is formed between the bent portions 4 and 5. . This hoop material 1 is fed to a preheater 7, where it is heated to about 40 to 90°C and transported to the next process. In addition, preheater 7
For example, electricity, far infrared rays, gas, high frequency, etc. are used. 8 is a foam raw material supply device;
For example, a nozzle may be used to move the foam material 9 into the recess 6.
is supplied as shown in FIG. 3b. The above raw material 9 is a raw material for polyisocyanurate foam, a resin for polyurethane foam (soft,
(hard, semi-rigid), phenol foam resin, polyimide foam resin, etc.
10 is a device for dispersing polystyrene beads 11;
Reference numeral 12 denotes a device for supplying the raw material 13 for soft urethane foam, which includes, for example, a spray gun. Further, the polystyrene beads 11 and the raw material 13 for the flexible polyurethane foam are added at the same time so that they are mixed on the back surface of the bent portion 5, as shown in FIG. 3c. In addition, the polystyrene beads 11 have compressive strength, have good "wetness" with the resin raw material 13 for soft polyurethane foam, and have excellent heat insulation properties and restoring power, and are resistant to impact during nailing. Do not destroy. Furthermore, since the soft polyurethane foam raw material 13 reacts and expands slowly, it fixes the lightweight polystyrene beads 11 at the discharge position without much displacement, and also fills the gaps between the polystyrene beads with the foam and integrates them.
Note that the discharge range S is the back surface 5 as shown in FIG. 3c.
It is preferable that it is not all of a, but a range of about 2 to 5 mm that is offset inward from the tip. This not only facilitates the work of pasting the sheet-like material described later, but also provides a safety margin to prevent part of the soft polyurethane foam raw material 13 from passing through the tip 5b of the bent portion 5 and going around to the surface 5c. It is something. Of course, at this time, the polystyrene beads 11 also have the function of suppressing the fluidity of the raw material for the soft polyurethane foam and suppressing its wrapping around the surface of the bent portion 5. A mold 14 is formed by upper and lower mold conveyors 15 and 16 as shown in FIG. 4, and the interval H between the molds corresponds to the thickness t of the heat insulating plate.
The mold 14 rotates in the direction of the arrow, gradually dissolves at the exit, and forms again at the entrance. Reference numeral 17 denotes a cure oven which surrounds upper and lower mold conveyors 15 and 16, which are both mold members.
It is a device that can heat up to 50-100℃, and is mainly useful for warming mold materials and curing foamed synthetic resin.
Further, although not shown, a dehumidifying device can be added to the cure oven 17 and operated depending on the raw material. 18 is a sheet-like material, such as laminating one or more of kraft paper, asbestos paper, asphalt felt, and nonwoven fabric;
These sheet-like materials are waterproofed or laminated with metal foil (Al, Cu, Fe, Sn). This is attached to an uncoiler 19, and is further fed to a sheet forming machine 21 via a guide roller 20. The sheet-like material formed by the sheet-like material forming machine 21 as shown in FIG. 3D is fed to the mold 14 while being gradually laminated in a predetermined area on the back surface of the hoop material 1. Note that the sheet-like material 18 is a material (release paper) that prevents contact between the mold material and the foam raw material 9.
It also has the function of preventing the foam raw material 9 and the soft polyurethane foam raw material 13 from leaking out of a predetermined area. Reference numeral 22 is a cutter for cutting a board fed from the outlet of the cure oven 17 and having a cross section as shown in FIG. 5 into a predetermined size. As a result, as shown in FIG.
The hoop material 1 and the sheet-like material 18 are bonded together by their self-adhesive properties when forming the foam made of the above-mentioned raw materials. .

What has been described above is only one embodiment of the method for manufacturing a board according to the present invention, and as shown in FIG. Along with dividing into two,
It is also possible to install a device that applies a tongue-like finish such as a ridge to the edge. Other sheet-like materials 1
It is also possible to feed the mold 14 while inserting the side wall 18a of No. 8 with a shoe. Further, in FIG. 2A, a set of embossing rolls can be installed in the middle of the molding machine 3, for example, immediately after the molding into a shape, or the embossing roll 26 can be disposed between the outlet of the molding machine 3 and the preheater 7.

As described above, the board manufacturing method according to the present invention is characterized in that different heat insulating layers can be manufactured on the hoop material on the same line very easily and efficiently at low cost. In addition, the heat insulating layer made of polystyrene beads bonded with soft polyurethane foam raw materials can be formed locally at the same time as other heat insulating layers, so it can be manufactured without creating gaps or deteriorating the strength and insulation properties of the board. be. moreover,
Since a heat insulating layer containing styrene beads is formed on the back of the bent part 5, the foam structure in this part will not be destroyed even when nails are driven in when installing the board, and the joint part will have waterproof and heat insulating properties. , and can form a heat insulating layer with no reduction in restoring force.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a siding board, FIGS. 2 a and b are a side view and a plan view schematically showing an apparatus for carrying out the method for manufacturing a siding board according to the present invention, and FIGS. 3 a to d are sectional views at each step in FIG. 2, FIG. 4 is a sectional view along the line shown in FIG. 2, and FIG. 5 is a perspective view showing a siding board manufactured by the manufacturing method according to the present invention.
FIG. 6 is an explanatory diagram showing another embodiment. 1... Metal hoop material, 3... Molding machine, 11... Styrene beads, 23, 24... Heat insulation layer.

Claims (1)

[Claims] 1. A continuously supplied band-shaped metal hoop material is formed into a concave shape, and bent portions of a male connecting structure and a female connecting structure are provided on both side edges, respectively, and then the concave portion of the bent portion is formed. The foam raw material is injected, and then polystyrene beads are simultaneously added to the soft polyurethane foam raw material on the back side of the bent part, which will form the female connection structure, and are mixed and laminated, and both of the foam raw materials react and foam. While in the middle state, the back surface from the bent end of the female connecting structure to the starting end of the male connecting structure is covered with a sheet shaped material, and when foaming both foam materials, A method for manufacturing a siding board, characterized in that these constituent materials are fixed together by the self-adhesive properties of the siding board.