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New JEDEC Trays Manufacturing Method to Align with Flatness Blueprint Call-Out

IP.com Disclosure Number: IPCOM000033853D
Publication Date: 2004-Dec-30
Document File: 2 page(s) / 29K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method that redefines the JEDEC tray manufacturing process by relocating the parting line where two halves of the mold cavity meet during the injection molding process to the top periphery, leaving the bottom surface periphery free from plastic flashing, surface irregularities, and depressions. Benefits include accommodating the Best-known Method (BKM) for measuring tray warpage (which uses the bottom periphery of the tray).

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New JEDEC Trays Manufacturing Method to Align with Flatness Blueprint Call-Out

Disclosed is a method that redefines the JEDEC tray manufacturing process by relocating the  parting line where two halves of the mold cavity meet during the injection molding process to the top periphery, leaving the bottom surface periphery free from plastic flashing, surface irregularities, and depressions. Benefits include accommodating the Best-known Method (BKM) for measuring tray warpage (which uses the bottom periphery of the tray).

Background

The JEDEC tray process is directly affected if one area at the bottom of a tray periphery is irregularly shaped. The parting line is currently located at the bottom of the tray, the same surface that has a flatness requirement. If irregularities occur on this surface, it affects the flatness of the surface and decreases the manufacturing yield.

General Description

The disclosed method relocates the parting line of two halves of the mold cavity to the top periphery of the JEDEC tray. Relocating the parting line along the “fence” to the top of the tray leaves the bottom free of surface irregularities (see Figure 1). Relocating the parting line requires changes to the mold manufacturing process.

Advantages

The disclosed method helps facilitate the BKM for measuring tray warpage relative to the actual usage of the tray, which in turn, can improve manufacturing yields thru upfront segregation  of out-of-specs (warped beyond acceptable limits) trays...