JPH0110204Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a foam molding device useful for molding a synthetic resin foam into a predetermined shape.

For example, a device for manufacturing a composite panel of a predetermined thickness with foam as a core material using a foam raw material made of polyurethane resin and a foaming agent added thereto is a device that molds it into a predetermined shape between upper and lower mold members. There are many other known types. However, when the above-mentioned panel was formed using this type of apparatus, the composite panel often had a mountain-like shape as shown by the dashed line of the surface material A as shown in FIG.
This is due to the fact that the foam raw material cannot be evenly distributed and laminated over the entire surface of the surface material A, and a large amount of foam material is distributed (fallen) almost in the center. That is, the foam raw material starts foaming radially around the position where it fell and in a short period of time. However, the reaction of the foam raw material is an exothermic reaction, and the temperature thereof is higher than that of the surface material A, so that the portion of the foam raw material in contact with the surface material A absorbs heat, reducing the reaction and foaming rate. On the other hand, the exothermic reaction progresses rapidly in the foam material above this contact area, and the scale of foaming increases.
The foam material B expands radially as shown in FIG. 2a. Of course, if the backing material is not applied onto the foam material B, the foaming pressure will result in a composite panel with a curved shape as shown in FIG. 2b. Therefore, as a method of suppressing this curvature, the front and back surfaces are made of the same material, and either a plate material that does not deform even under the foaming pressure of the foam raw material B is used, or the foam raw material B is uniformly spread on the back surface of the front surface material A. There are two possibilities: dispersion and uniform foaming.

The present invention is a foam molding device for realizing the above method, including a molding machine that molds the face material into a predetermined shape, a feeder that discharges the foam raw material approximately in the center of the molded face material, and a discharge device. A gas spray pipe that disperses the formed foam raw material in the width direction of the facing material, and a mold that reacts and foams the foam raw material and molds it into a predetermined shape are continuously arranged. The present invention proposes a foam molding device that reliably spreads the foam raw material discharged over a long period of time, uniformly distributing the foam raw material, and suppressing dimensional deformation due to uneven distribution of the foam raw material.

EMBODIMENT OF THE INVENTION Below, the foam molding apparatus based on this invention is demonstrated in detail using drawings. FIG. 3 is a schematic diagram showing the configuration of the apparatus according to the above invention, in which 1 is a face material made of a coiled metal plate, sheet material, etc., and 2 is a molding machine that continuously forms the face material 1 into a predetermined shape. , for sending to the next process. Reference numeral 3 denotes a foam raw material feeder, which is of the type such as a spray gun or a mixer (not shown), and its discharge state is approximately at the center in the width direction of the face material 1, as shown by the dashed line in Fig. 2a. The foam raw material 4 is discharged onto the portion. The foam raw material 4 is made of one of polyurethane foam, polyisocyanurate foam, urea foam, epoxy foam, polyamide foam, polyimide foam, etc., for example. Reference numeral 5 indicates a gas spray pipe (hereinafter simply referred to as a nozzle) to react the foam raw material 4 which has been discharged more to the center of the back surface of the face material 1 than to other positions, and during foaming, air, gas, etc. are blown to create a substantially uniform thickness. It is intended to be extended to To explain further, the nostle 5 is composed of a hollow pipe 6, a stopper 7, and a large number of spray holes 8 formed in the outer peripheral surface of the hollow pipe 6, as shown in FIG. A plurality of spray holes 8 are formed so that the diameter increases from a small diameter to a large diameter from the center to both sides of the nozzle 5 , and the diameter also increases from a small diameter to a large diameter in the circumferential direction. be. That is, as shown in FIG. 5, which shows the hollow pipe 6 expanded, the diameter of the spray hole 8 changes almost continuously from small to large as it moves away from the center vertically and horizontally. The holes were drilled in a radial distribution. In other words, the foam raw material 4 is deposited more in the center of the back surface of the face material 1 than in other parts.
is formed so that it can be spread to an average thickness over the entire back surface by wind pressure from the spray holes 8. This is because when the diameter of the spray hole 8 is small, the air jet speed is high and the foam raw material 4 is dispersed over a wide range, and as the diameter becomes larger, this force becomes weaker, so that spreading becomes possible.
Further, the nozzle 5 is installed at a position away from the back surface of the panel 1 and in front of the entrance of a mold to be described later, so as to cross the longitudinal direction of the panel 1 at a right angle. It is also possible to provide an escape hole 9 at the end of the hollow pipe 6 in the nostle 5 in order to release excess wind pressure. 10 is a sheet material; 11 is a mold; an endless upper mold member 12 and an endless lower mold member 13 face each other at a predetermined distance t; The foam raw material 4 is reacted and foamed to form it into a predetermined shape.

Next, to explain the operation of this device, it is assumed that a composite plate with a cross section shown by the solid line in Fig. 1 is manufactured, and a colored steel plate is used as the facing material 1.
A polyurethane resin was prepared as the foam raw material 4, and a sheet of asbestos paper laminated with aluminum foil was prepared as the sheet material 10. Thereupon, the facing material 1 is continuously molded in a molding machine 2 and sent to the next process. Next, the foam raw material 4 is discharged from the foam raw material feeder 3 into the recessed part of the face material 1, and onto the back surface thereof, to form a foamed body as shown by the dashed line in FIG. 2a. be done. Next, air is applied to the foam raw material 4 in the middle of foaming so that the foam raw material 4 is distributed in an average amount over the entire surface of the recess of the face material 1 when the face material 1 passes directly under the nosle 5. Spray and spread. Then, the sheet material 10 is laminated on the foam raw material 4 which has been spread almost uniformly by the nostle 5 . Therefore, this is fed into a mold 11 consisting of upper and lower mold members 12 and 13, and while passing through this mold 11 , the foam raw material 4 is foamed and hardened, and from its exit, a composite material as shown in FIG. 1 is formed. It is sent out as a board.

What has been described above is only one embodiment of the present invention, and the gas can be used regardless of whether it is hot air, cold air, or hot air.

As described above, according to the foam molding apparatus according to the present invention, the foam raw material discharged in a pattern at the center of the face material is distributed from the center to both sides by changing the aperture and distribution density. Due to the pressure difference from the spray holes and the tailwind effect, the foam material on the face material can be distributed evenly from the center to both side edges and forward. In addition, since the foam raw materials can be distributed evenly, the dimensions of the face material do not change, and a composite board with a beautiful appearance can be obtained. In addition, it has the characteristic that it can perform functions according to the discharge pattern and reaction speed of the foam raw material.

[Brief explanation of the drawing]

1 and 2 are longitudinal cross-sectional views illustrating the dimensional changes of a composite plate manufactured by a conventional method, FIG. 3 is a schematic diagram showing the configuration of an embodiment of a foam molding apparatus according to the present invention, and FIG. 1 and 5 are an explanatory diagram of a gas spray pipe, which is a main part of the device according to the present invention, and a developed diagram of a hollow pipe. DESCRIPTION OF SYMBOLS 1... Surface material, 3... Foam raw material feeder, 5 ... Gas spray pipe, 11 ... Mold.

Claims (1)

[Scope of utility model registration request] A molding machine that molds the facing material into a predetermined shape, a feeder that discharges a foam raw material to approximately the center of the molded facing material from the molding machine, and a gas spray pipe that spreads the foam raw material in the width direction of the facing material. and a mold consisting of upper and lower mold members that sandwich the sheet material in a stacked state on the foam raw material, and the gas spray pipe is inserted in front of the mold entrance and traverses the longitudinal direction of the facing material. This gas spray pipe has spray holes that increase in diameter from small to large from the center to both sides, and also has small holes in the circumferential direction. A foam molding device characterized by having spray holes having a diameter ranging from a diameter to a large diameter.