TABLE OF CONTENTS Hoechst Celanese: Celcon
Molded parts of Celcon acetal copolymer are readily joined by a variety of techniques. The crystalline polymer permits a high degree of long-term structural loading on the joined assembly up to maximum service temperatures of 104 C (220 F) in air and 82 C (180 F) in water. However, care must be taken to ensure that assembly designs do not damage the surface of the male or female molded part, which could reduce the mechanical properties such as impact strength.
Reference: Designing with Celcon Acetal Copolymer, Supplier design guide (95-303/5M/1295), Hoechst Celanese, 1995.
BASF AG: Ultraform
Ultraform parts can be welded by heating-element (thermal contact and radiation) methods, and also by ultrasonic, vibration, and spin welding methods. However, high frequency welding is not feasible, for Ultraform on account of the low dielectric dissipation factor.
The laser irradiation welding method is suitable for joining parts molded from Ultraform, which is transparent to IR radiation (e.g., natural-colored), to parts molded from grades of Ultraform that absorb IR radiation (e.g., containing carbon black). Thus, very clean welded joints can be produced without flash.
Ultrasonic welding is preferred in cases where short welding times and ready integration into fully automated production lines are required. The strongest welded joints are achieved with the heating-element method.
Reference: Ultraform in Processing, Supplier design guide, BASF Aktiengesellschaft.
Ticona: Hostaform
Hot plate welding has proved a successful method of joining Hostaform injection molded components, irrespective of pigment or additive content. This method...
