• Design & Manufacturing
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• v.2 no.4
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• pp.37-43
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• 2008

Supplementary features in injection molded products, which are boss, rib and snap fit, are mainly located in the products. These features might make molding flow improper in injection processing and consequently give rise to some of molding troubles such as short shot and hesitation. The sink mark on boss parts is generated by the volumetric shrinkage that is caused by both the molding thickness and the closed boss height. The volumetric shrinkage is affected by packing pressure and its amount tends to decrease by increasing the packing pressure. The packing pressure can therefore increase flow rate to a boss part and causes the sink mark depth to increase. As the molding thickness and the closed boss height in the boss part can increase the part volume, these may yield bad solidifying and also extend the molding cycle. In this paper, both the injection molding test and the flow analysis were carried out to investigate the effect of sink marks generated in the boss part of injection molded products.

• Fashion & Textile Research Journal
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• v.14 no.1
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• pp.90-99
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• 2012

The purpose of this study is to compare female members's jumper and jacket preferences for five different styles of Fall/Winter jumpers and jackets, divided into three age groups(65-69 yr, 70-74 yr, over 75 yr). Total 324 senior females, ages over 65 in Kimhae and Busan area were chosen for the study. The major findings of this study were as follow; For the age group, 65 to 69, in the jumper category, it was important for them to look slender and sophisticated. Jumpers with quilted thin fabrics, jumpers with hooded jumpers zippers, and short chinese collar in the short blouson style were preferred in the age group. Jacket needed to be designed in A-line styles, short or long with one or two buttons and of various length. For those in the 70 to 74 age group, the jumper designs need to be tidy and clean with box-shaped pockets. In addition, various formal style jumpers with increasing length up to hip lines. For jackets, it is necessary to increase the number of designs with convertible collars with three button in front, elegantly covered pocket, long enough to cover the hip line. For those in the age group of 75 or over, it was essential for jumpers and jackets to be of increasing length in box style, loose-fit with, front-closure or snap buttons and out pockets that allows one to put their hands in the jumper. They preferred jacket length down to the hip-line, wing collar for jumpers, tailored collar for jackets more than the other age groups.