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Article: Morphology and mechanical properties of injection molded articles with weld-lines.
- Article from:
- Polymer Engineering and Science
- Article date:
- January 1, 1997
- Author:
CopyrightCOPYRIGHT 1997 Society of Plastics Engineers, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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INTRODUCTION
Weld-lines or knit-lines occur in any injection molded articles whenever two melt fronts meet each other (1). There are generally two types of weld-lines; "hot weld-line," which occurs when using an insert in a mold cavity, and "cold weld-line," which occurs from a direct impingement of two melt fronts when multi-gates are used in injection molding (2). Since weld-lines result in reduced mechanical properties (e.g. tensile strength and elongation at break) of injection molded articles, many research groups (2-7) have studied the effect of weld-lines on the mechanical properties of molded articles. The materials employed were semicrystalline polymer ...
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