JPS6227664B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing moisture adhering to the surface of a foam molded product such as styrene foam when it is cooled after being molded.

Styrofoam is molded using a mold that has slits for letting air out of the cavity and for supplying heating steam into the cavity, and after foaming is completed, the mold is cooled with water. Therefore, water enters the mold through the slit and adheres to the surface of the molded product. For this reason, conventionally, after the molded product is released from the mold, it is placed in a furnace and heated and dried, which requires a lot of effort and expense.

The present invention removes moisture adhering to the molded product in the mold after molding is completed. To explain this with respect to the embodiment shown in the drawings, 1A and 1B are a pair of molds, which are formed into the required shape for molding the cavity, and are formed by a mold plate 2 having slits (not shown) at appropriate locations. A frame plate 4 for forming a heating chamber 3 is attached to the outside.

5 is a cooling nozzle pipe provided in the heating chamber 3 of each mold 1, to which a water supply pipe 6 is connected;
In addition, an air supply device 7 is connected to the water supply pipe 6 by branching it, and air having the same pressure as the cooling water in the water supply pipe 6 is
It is possible to supply water within the water supply pipe 6. A valve 8 is attached to the water supply pipe 6 so that only air can be sent thereto, and a valve 8 is attached to the water supply pipe 6, and a valve 8 is attached to the water supply pipe 6, and a valve 8 is attached to the water supply pipe 6 so that only air can be sent thereto. Opening/closing valves 9A and 9B are also provided at the front stage of 1A and 1B.

Reference numeral 10 denotes a drain pipe installed in each mold 1 in order to discharge drain and cooling water in the heating chamber 3, and an air intake device 11 is connected to this by branching off from the drain pipe 10. A closing valve 12 is provided for closing the drain pipe 10 when the air intake device 11 sucks air in the heating chamber 3. And mold 1A, 1
In the part of the drain pipe 10 connected to B, there is a mold 1.
Opening/closing valves 13A and 13B are interposed to make it possible to suck the air in the heating chambers 3 of either one of the heating chambers A and 1B. 14 is a check valve; 15 is a valve for preventing water from flowing into the intake device 11;
6 is a molded product. The valves provided in the water supply pipe 6 and the drain pipe 10 may have any structure, but if electromagnetic valves are used, their operation is easy. Since the water supply pipe 6 and the drain pipe 10 are moved on one side of the mold 1 for mold clamping and mold opening, a flexible hose or the like is used so as not to interfere with the movement. In FIGS. 2 to 4, among the pipes connected to the molds 1A and 1B, only the pipes whose valves are open are shown. Therefore, the conduits not shown in FIGS. 2-4 are closed. Styrofoam is molded by filling a cavity formed by mold plates 2, 2 of molds 1A, 1B clamped as shown in FIG. 1 with raw materials. The filling of the raw material into the cavity is carried out by a conventional method using a filling device (not shown) which is attached to the mold 1 by penetrating one of the mold plates 2 and the frame plate 4. After filling the raw material, steam is supplied into the heating chamber 3 to heat the mold plate 2, and at the same time, the steam is allowed to flow into the cavity through the slit formed in the mold plate 2, thereby heating and foaming the raw material. The drain in the heating chamber 3 at this time is discharged through the drain pipe 10 with the valves 12 and 13 closed. When foaming progresses and molding is completed, the supply of steam is stopped, valves 8 and 9 are opened, and cooling water is supplied to water supply pipe 6. This cooling water is ejected from the nozzle pipe 5 through the mold plate 2 to cool the molded product and stop its foaming, but this cooling water also enters the inside of the mold plate through the slit and wets the molded product. At the same time as the cooling water is supplied to the water supply pipe 6, air having the same pressure as the water inside the water supply pipe 6 is supplied from the air supply device 7, and water and air are simultaneously ejected from the nozzle pipe 5. Since the water is sprayed out in the form of mist due to air pressure, it is suitable for reducing the amount of water that enters the template 2 through the slits. However, the mixing of air into the cooling water is optional, and it is also possible to use only the cooling water.

After the cooling of the molded product is finished and the supply of cooling water is stopped, the on-off valves 9A and 9B are closed to seal the inside of the heating chamber 3, and the shut-off valve 12 is closed.
The on-off valves 13A and 13B are opened and the air inside the heating chambers 3 and 3 is sucked in by the suction device 11, and the inside thereof is brought into a vacuum state. By suctioning the air inside the heating chamber 3, the moisture inside the heating chamber 3 and inside the slit is also suctioned.
The inside of the heating chamber 3 is in a dry state, and the remaining moisture is almost only that attached to the surface of the molded product.

Once the heating chambers 3, 3 are in a vacuum state, after a certain period of time, the on-off valves 9A, 1 are opened as shown in FIG.
3B, open the on-off valves 9B and 13A, pressurized air is sent from the air supply device 7 into the heating chamber 3 of the mold 1B, and the air in the heating chamber 3 of the gold 1A is sucked by the suction device 11. The molds 1A and 1B are slightly opened, and then the above-mentioned pressure feeding of air and air intake by the air intake device 11 are continued for a certain period of time. The degree to which molds 1A and 1B are opened is 20
It is sufficient if the molded product is about mm, as in the example.
When the cross section is concave, a part of the mold 1B that is inserted into the molded product is inserted into the molded product, and the space created between the molded product and the mold 1B is separated from the molded product and the mold 1B. so that it becomes closed. When the molded product is in the form of a flat plate, parts of the opposed templates are opened slightly to the extent that they can maintain their bonded state.
At this time, the molded shape is on the side of the mold 1A where the inside of the heating chamber 3 is under negative pressure.

With the molds 1A and 1B opened as described above,
Next, as shown in FIG. 3, the on-off valve 9B is closed, the on-off valve 9A is opened to force air into the heating chamber 3 of the mold 1A, the on-off valve 13A is closed, and the on-off valve 13B is
The air inside the mold 1B is sucked in by the suction device 11, and the molded product is transferred from the mold 1A to the mold 1B side. After transferring the molded product to mold 1B, as shown in Figure 4,
Close the on-off valves 9A and 9B, close the on-off valve 13B,
The on-off valve 13A is opened, the air in the heating chamber 3 of the mold 1A is sucked again using the suction device 11, and the molded product is transferred to the mold 1A side again.The suction device 11 is then stopped and the mold 1A, Open 1B completely and take out the molded product.

As shown in Figure 4, the molded product is transferred from mold 1B to mold 1.
The reason why it is transferred to the A side is that in the illustrated mold, a pin for ejecting the molded product is generally provided in the mold 1A, and there is no need to limit the process of transferring the molded product shown in FIG. be. That is, it is also possible to take out the molded product from the state shown in FIG.

After the molding was completed, the foamed polystyrene molded product, which was treated with the mold slightly opened as described above, had no moisture on its surface, and no subsequent drying treatment was necessary.

After the heating chambers 3, 3 are evacuated after the molding is completed, the molds 1A, 1 are removed as shown in FIG.
By slightly opening B, the molded product is released from the mold 1B, and the slits in the template 2 are scattered at several places on the template 2, so the adhesion between the mold 1A and the molded product is slightly reduced. When the mold 1A collapses, the air inside the heating chamber 3 of the mold 1A is sucked, and the inside of the heating chamber 3 becomes a negative pressure. It is thought that by being sucked into the heating chamber 3 of the mold 1A, moisture on the surface of the molded product on the mold 1A side is first removed.

On the other hand, the air supplied from the air supply device 7 into the mold 1B passes through the slits in the mold plate 2, flows over the surface of the molded product, and flows out from between the molded product and the mold 1B. , dry the surface of the molded product on the mold 1B side.

Next, as shown in Fig. 3, the heating chamber 3 of the mold 1A
By supplying air to the heating chamber 3 of the mold 1B, transferring the molded product to the mold 1B side, and continuing this state for a certain period of time, the mold 1B and the mold 1B are transferred through the slit. The air in the space between the molded parts is sucked out,
At the same time, the entire surface of the molded product is dried by sucking the moisture on the surface of the mold 1B and the surface of the molded product facing it, which saves the effort required to dry the molded product after the mold is released. can. As shown in FIG. 4, if the molded product is transferred from the mold 1B to the mold 1A again, drying of the molded product can be further accelerated. The order of transferring the molded products can also be reversed to that in the example.

After creating a vacuum inside the molds 1A and 1B, when opening them slightly, the on-off valve 9B is opened to atmospheric pressure, the intake device 11 is opened while stopped, and then air is pumped and sucked. You can also do that. Furthermore, if air is pumped into the other heating chamber 3 together with the intake air in one heating chamber 3, a drying effect will be produced by the pumped air, but basic drying is performed by the intake air. From, on-off valve 13
When air is being taken in from one of the molds A and 13B, it is sufficient to simply open the on-off valve 9 of the mold on the opposite side to atmospheric pressure, and in this case as well, the molded product can be sufficiently dried.

As mentioned above, the present invention removes moisture on the surface of the Styrofoam molded product in the mold after molding is completed, and removes moisture only by supplying air or suction. In this way, there is no risk of the temperature being too high and affecting the molded product, and if a solenoid valve is used for each valve, moisture removal can proceed almost automatically using a timer or other device. Water can be removed efficiently.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a cross-sectional view when molding is completed, FIG. 2 is a cross-sectional view when the mold is opened,
FIG. 3 is a sectional front view of the molded product during the first transfer, and FIG. 4 is a sectional front view of the molded product during the second transfer. 1: Mold, 2: Template, 3: Heating chamber, 4: Frame board,
5: Nozzle pipe, 6: Water supply pipe, 7: Air supply device,
10: Drain pipe, 11: Intake device.

Claims (1)

[Scope of Claims] 1 A pair of molds in which the mold plate constituting the cavity has a slit and a heating chamber is formed on the outside thereof, the raw material is heated and foam-molded, and after molding, water is poured into the heating chamber. In the molding of a foam molded product that is supplied and cooled, the heating chambers of a pair of molds are brought into a vacuum state while the molds remain closed after the cooling, and then air is allowed to be supplied into the heating chamber of one mold, while the other mold is heated. The air in the heating chamber of the mold is sucked out, and the mold is slightly opened to close the space formed between it and the molded product, and then the air is sucked into the heating chamber of the mold with the molded product attached. A method for removing moisture adhering to the surface of a foamed molded product, which transfers the molded product between molds by sucking the air in the heating chamber of the other mold. 2. A method for removing surface moisture from a foam molded product according to claim 1, which comprises forcibly supplying air into a heating chamber of a mold.