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Browse Prior Art Database

Injection Mold Temperature Control

IP.com Disclosure Number: IPCOM000081581D
Original Publication Date: 1974-Jul-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Iwata, PG: AUTHOR [+2]

Abstract

Molds for injection molding of thermoplastic material are heated and temperature controlled by the use of heated fluid, for example water or oil. The fluid lines are integral or in contact with the exterior of the mold. When the mold is removed from the press, fluid in the lines tends to spill. This system purges the fluid from the lines prior to removal of the mold from the press and thus avoids spillage.

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Injection Mold Temperature Control

Molds for injection molding of thermoplastic material are heated and temperature controlled by the use of heated fluid, for example water or oil. The fluid lines are integral or in contact with the exterior of the mold. When the mold is removed from the press, fluid in the lines tends to spill. This system purges the fluid from the lines prior to removal of the mold from the press and thus avoids spillage.

This injection mold heating and temperature control unit includes a heating tank 2 and fluid circulation lines to and from a mold, not shown. Water heating is accomplished, for example, by immersion heaters in the heating tank 2. Cooling is accomplished by opening drain valve 4 and cold fluid supply valve 6. This allows the cold fluid supply to force hot fluid out of the system.

Fluid is removed from the circulation lines and mold by this system. This is accomplished by closing supply valve 6, opening drain valve 4, and opening air supply valve 8. The air pressure causes normally open 3-way air operated valve 10 to shift to close the lines between heating tank 2 and the mold, and at the same time open the air supply to the mold lines. This in turn allows the air pressure to force the water from the mold lines and out of open drain valve 4.

After a predetermined time, air supply valve 8 is closed, while supply valve 6 remains closed and drain valve 4 remains open. This allows 3-way valve 10 to return to its normal open position...