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Method of Detecting Foreign Particles at Mold Station

IP.com Disclosure Number: IPCOM000235699D
Publication Date: 2014-Mar-20
Document File: 2 page(s) / 168K

Publishing Venue

The IP.com Prior Art Database

Abstract

An effective method to detect and prevent mold defects such as in-complete fill and mold voids due to air vent block or mold residue stuck at corner areas is provided. This residue is also known as foreign particles on the mold.

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Document Title 

Method of Detecting Foreign Particles at Mold Station

   

Abstract 

An effective method to detect and prevent mold defects such as in-complete fill and mold voids due to air vent block or mold residue stuck at corner areas is provided.  This residue is also known as foreign particles on the mold.

Body 

In a typical transfer molding process, the mold compound sometimes leaves a residue of the resin (or compound) on the mold surface due to the stickiness. The better the adhesion of the compound to the packaging, the higher chances the mold compound residue will occurs.  The mold equipment has incorporated an auto-cleaner unit in the design (Fig 1). After every mold shot, the mold opens and the cleaner unit moves in to clean the mold surface area, typical 1x ~2x cycle.  There is no method to determine the cleanliness of the mold cavity surface as it is done in continuous production mode. Therefore, the chances of mold compound residue still occurs. 

To counter this, we provide a mold cleaning mechanism (shown in Fig. 2).  After every mold shot, the mold opens and the cleaner unit moves in to clean the mold surface area, typical 1x ~2x cycle. A vision unit is added on the top and bottom of the cleaner unit to detect surface ‘condition’ to detect any anomaly.  For any anomaly found the system can be triggered to prevent contamination to the next molding cycle, hence the defect will be prevented from happening.

A comparison of the design and method...