JPS6114418Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a mold for foam molding, and attempts to obtain a mold suitable for achieving energy saving.

Conventionally, thermal insulation in foam molds for producing foam molded products by heating and expanding foam molding thermoplastic resin particles filled into the mold cavity with steam has been achieved by using materials such as FRP or rubber inside the mold frame. For example, see Japanese Patent Publication No. 47-2176). However, in this case, no problem will occur as long as the parts bonded for insulation purposes and the inner surface of the mold (frame) are completely bonded without any gaps, but if some peeling occurs, it may occur during the cooling process. The used water collects in the gaps between the peelings, and in the next heating process, these water pockets must be completely evaporated, which results in the need for a large amount of steam to be used for heating, which runs counter to energy savings.

Therefore, in this invention, we are trying to solve the above-mentioned conventional drawbacks and provide a foam molding mold that has excellent heat insulation properties and is suitable for energy saving.The structure is as follows: In a foam molding mold for obtaining a foam molded product by heating and expanding plastic resin particles with a heating medium such as steam, the inner surface of the mold member to be insulated out of other parts other than the inner mold has heat insulating properties. It is characterized in that a heat insulating shielding plate made of a glass fiber reinforced plastic FRP plate, a rubber plate, or a fluororesin plate is provided with a gap between it and the mold member.

Next, embodiments of this invention will be illustrated below with reference to the drawings.

10 is a box frame on the cavity mold A side, 11 is an inner mold attached to the box frame 10, and 12 is a back plate.
20 is a box frame on the core mold B side, 21 is an inner mold attached to the box frame 20,
22 indicates a back plate. Further, 13 and 23 are cooling water pipes introduced into the cavity mold A and the core mold B, respectively, and spray nozzles 14 and 24 (drilled holes may be used) are provided to cool the inner molds 11 and 21. ing. 15 and 25 are cavity mold A
and each drain hole on the core mold B side, 18, 2
8, 18', and 28' indicate steam supply holes.

30 is a mold cavity formed between the inner molds 11 and 21, 40 is an eject pin, 41 is a bracket for supporting the eject pin 40, 42 is a spring, and 43 is a retaining ring for the spring. 50 indicates a raw material filling feeder.

Furthermore, 15 and 26 are heat insulation shielding plates that are a feature of this invention, and are provided with gaps 17 and 27 on the inner surface side of the mold member to be insulated among other parts other than the inner molds 11 and 21. , in the case of the figure, each box frame 10 and 20 on the cavity mold A side and the core mold B side,
It is provided on the inner surface of the back plates 12 and 22. However, box frames 10 and 20
Water collects on the lower side of the mold when it is cooled by water, so it would be useless to install the above-mentioned insulation shielding plate.
9 and 29 are pasted together.

The above-mentioned heat insulation shielding plates 16 and 26 include:
It uses materials that have heat insulation properties, such as glass fiber reinforced plastic FRP plates, rubber plates, or fluorine resin plates (Teflon plates), which have a higher degree of insulation than the aluminum or aluminum alloy materials used as mold members. It is something.

An example of the mounting portion 60 of the heat insulating shield plate will be explained with reference to FIG. 2, which shows an enlarged view of the Y portion of the cavity mold A in FIG. spacer for mounting, 62 is a mounting bolt, 63
is Watsiyah. A heat insulating shielding plate 26 on the core mold B side is also attached in the same manner.

In addition, in the above embodiment, the heat insulation shielding plate 1
Regarding 6 and 26, the case where gaps 17 and 27 are provided between the box frames 10 and 20 and the back plates 12 and 22, which are mold members, to avoid contact with these mold members has been exemplified. 1
If gaps 17, 27 are maintained between 6, 26 and each mold member to the extent that water does not accumulate between them,
It may also be carried out by partially contacting the two (not shown).

Next, in order to compare the case of using the foam mold of this invention with the case of using a conventional mold, neoprene rubber with a thickness of 6 mm was used as the heat insulating shielding plates 16 and 26, and the gaps 17 and 27 were spaced 5 mm apart. When a fresh fish box was made into a foam molded product, the outside temperature of the mold was 95°C, which ranged from 95°C to 103°C (when heated), and the mold side temperature when using a conventional mold was 55°C.
Even when compared with the range from ℃ to 103℃ (when heated), it was found that in the case of this invention, the outside of the mold was not cooled due to the water shielding and insulation effect during cooling with the heat insulating shield plate.

As described above, in the foam molding mold according to this invention, a glass fiber-reinforced plastic FRP plate, a rubber plate, or a foam plate having heat insulating properties is placed on the inner surface of the mold member that is to be insulated among other parts other than the inner mold. Since the heat insulating shield plate made of a plastic plate is provided with a gap between it and the mold member, even during cooling, the heat insulating shield plate blocks the cooling water and provides heat insulation. The mold members to be insulated, such as the back plate, will not be cooled and will only radiate heat, which will help save energy. In addition, since there is a gap between the insulation shielding plate and the mold member to be insulated, there is no risk of water pooling, and it is even more advantageous in that it eliminates the drawbacks of conventional molds, such as requiring a large amount of steam for heating. It can contribute to energy saving. Furthermore, it has various excellent effects, including a mold for foam molding that can be provided at a lower cost than conventional rubber or FRP bonding.

[Brief explanation of the drawing]

The figures illustrate an embodiment of this invention, with FIG. 1 being a sectional view and FIG. 2 being an enlarged sectional view of the front Y portion. A... Cavity mold, B... Core mold, 1
0,20...Box frame, 11,21...
Inner type, 12, 22... Back plate, 1
6, 26...Insulating shielding plate, 17, 27...Gap.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A mold for foam molding that obtains a foam molded product by heating and expanding expandable thermoplastic resin particles filled in a mold cavity with a heating medium such as steam, excluding an inner mold. Place a heat insulating shielding plate made of a glass fiber reinforced plastic FRP board, a rubber board, or a fluorine resin board that has heat insulating properties on the inner surface of the mold member that is to be insulated, leaving a gap between it and the mold member. A mold for foam molding, characterized in that it is provided with: 2. The foam molding mold according to claim 1, wherein the mold members to be insulated include a box frame and a back plate. 3. The mold for foam molding according to claim 1, wherein the heat insulating shielding plate is partially in contact with the mold member.