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Cull-less Molding Concept

IP.com Disclosure Number: IPCOM000018022D
Original Publication Date: 2001-Dec-01
Included in the Prior Art Database: 2003-Jul-23
Document File: 2 page(s) / 252K

Publishing Venue

Siemens

Related People

Lim Boon Huat: AUTHOR [+4]

Abstract

The cull-less molding concept is a new concept of molding to reduce compound usage. The molding compound will be transfered by plunger into the runners and later pushed by guided inert gas into the cavities. Actually the compound wastage in culls and runners are high because there is some of the compound re- maining in the culls and runners. In fact they are fully filled with compound.

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Industrie

Cull-less Molding Concept

Idee: Lim Boon Huat, MAL-Melaka;

Tan Seng Gee, MAL-Melaka;Rony Monteiro, MAL-Melaka;Wong Chong Chin, MAL-Melaka

The cull-less molding concept is a new concept ofmolding to� reduce� compound� usage.� The� moldingcompound will� be� transfered� by� plunger� into� therunners and later pushed by guided inert gas into thecavities.

Actually the compound wastage in culls and runnersare high because there is some of the compound re-maining in the culls and runners. In fact they are fullyfilled with compound.

The compound usage� outside� the� cavities� will� bereplaced by an inert gas. So tools life span will beprolonged and shrinkage� of� compound� will� be� re-duced.

Figure� 1� shows� the� state� of� the art. The plungerpushes the compound all the way from the plungerpot through the runners and fills all cavities.

Fig. 1

Siemens� Technik Report� � � � � Jahrgang 4� Nr.14� � � � � Dezember 2001

Industrie

After the compound is pushed over the position of thesecond nozzle it is activated to push the molten com-pound further to the position of the third nozzle. Theactivation of the nozzles continue until all six nozzlesare activated and the compound filled the cavities.

In the end the nozzles are still applying a pressure onthe� compound� to� ensure� that� no� shrinkage� couldcause changes of package dimension.

Figure 2 shows the new method of molding.

Fig. 2

In� the� first� step� the� mchanically� activated plungermoves upwards to push the compound.

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