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http://dx.doi.org/10.5228/KSPP.2005.14.3.233

Blow Characteristics in Extrusion Blow Molding for Operational Conditions  

Jun Jae Hoo (서울산업대학교 대학원)
Pae Youlee (아담스테크노로지㈜)
Lyu Min-Young (서울산업대학교 금형설계학과 정밀기계기술연구소)
Publication Information
Transactions of Materials Processing / v.14, no.3, 2005 , pp. 233-238 More about this Journal
Abstract
Blow molding is divided into three categories, injection stretch blow molding, injection blow molding, and extrusion or direct blow molding. Extrusion blow molding has been studied experimentally to characterize the blowing behavior of parison. Blow conditions such as blowing temperature and cooling time were the experimental variables in this blowing experiment. Wall thickness of the lower part of blow molded sample was thicker than that of the upper part because of the sagging of parison during extrusion process. As temperature increases the wall thickness and the weight of blow molded sample decreased. No thickness variations in the blowing sample were observed according to the cooling time. The lower part of the sample showed high degree of crystallinity compare with the upper part of the sample. Thus the lower part of the sample was strong mechanically and structurally. It was recognized that the uniform wall thickness could not be obtained by only controlling the operational conditions. Parison variator should be introduced to get uniform wall thickness of parison and subsequently produce uniform wall thickness of blow molded product.
Keywords
Extrusion Blow Molding; Parison; Blowing Temperature; Cooling Time; Wall Thickness;
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