A Study about Optimal Design for Preform Injection Mold for 3-Stage Injection Blowing System Using Finite Element Method

Abstract:

This paper presents a series of injection process simulations for blow molding preforms by using MoldFlow. The injection-blowing system was used and this consists 3 stages on the same machine; (1) preform injection, (2) blowing and (3) ejection. The quality of preform injection process is an important factor that can dominate the whole process efficiency. The injection mold system consists of 10 cavities and a hot runner system. The hot runner system has 10 cavities and temperature of each cavity can be independently controlled. Through several filling analyses, suitable temperature of each gate was determined so that all cavities could be simultaneously filled. Weld lines on the bottom of preforms were predicted. This fact can be an important aspect because preforms will be blown. To improve cooling efficiency, ''Floody Cooling Type" channels were applied. Conventional cooling channels were straight-line types and then distances between cooling channels and cavities cannot be uniformed. Floody cooling type channels were uniformly placed around cavities as far as possible. To compare two different types of cooling channels, cooling tests of MoldFlow were carried out and certain advantages of floody cooling type channels were evaluated.

• Periodical: Advanced Materials Research (Volumes 753-755)
• Pages: 249-252
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.753-755.249
• Online since: August 2013
• Authors: Tae Il Seo, Byeong Uk Song, Yong Seok Lim
• Keywords: Blowing, Filling, Hot Runner, Injection, Mold, Moldflow, Preform

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