A Practical Guide to the Selection of High-Temperature by A. A. Collyer

By A. A. Collyer

Is helping the person with out formal education in plastic fabrics in the course of the maze of fabrics choice to his ultimate target. people with a simple wisdom of this region will enjoy the more effective elements of the advisor

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The aluminium cost is less than both that of polycarbonate and polyacetal, despite the weight of the aluminium part being about twice that of the thermoplastic parts. In practice, a designer would have a thicker product section in the plastic to give an equivalent stiffness to the aluminium product. Hence costing the material is not always clear cut. It s h o u l d also be remembered that the plastic parts could probably be processed more economically than the aluminium part. 4, the projected selling price should be compared with that of existing products, if there are any.

27 Selection of High-Temperature Engineering Thermoplastics As these examples show, the designer needs to understand the processing characteristics of the materials under consideration. 4 Assembly Once the process or group of processes that may produce the part has been decided, any additional assembly operations should be considered. The following questions should be addressed: • is the assembly economic? • is it foolproof? • do the tolerances permit automatic handling? • will the candidate materials be suitable for glueing or welding?

Ideally, i n j e c t i o n m o u l d i n g machines should be used eveiy day of the year, but this is not usually so. In Britain the most common usage is 24 hours a day for 5 days a week for 48 weeks a year. This gives a total number of moulding hours T of = 5760 h/year. 2: Percentage downtime as a function of the length of the run [8] Weeks 2 (standard) Machine fault Tool fault Material fault Tool change Trials Others Total percentage downtime; Successful moulding time 9 3 1 4 3 5 25 75 1 4 12 5 2 8 4 5 36 64 6 2 1 2 2 5 18 82 n e w r u n or e a c h n e w week.

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