A. A. Collyer's A Practical Guide to the Selection of High-Temperature PDF

By A. A. Collyer

ISBN-10: 094639587X

ISBN-13: 9780946395873

Is helping the person with out formal education in plastic fabrics during the maze of fabrics choice to his ultimate aim. people with a easy wisdom of this region will enjoy the more effective points of the advisor

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Extra info for A Practical Guide to the Selection of High-Temperature Engineering Thermoplastics

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7 where K is a constant dependant on currency and inflation. In 1976, K equalled 11 with F in tons and V in gram. 7 has changed for the more expensive end of the market. 8 V+ 250F Once the cost of the machine has been determined at the current replacement cost, it is customary to allow another 20% for the cost of ancillary equipment such as mould heaters and chillers, mould handling equipment, hoppers and jigs. 2M. If one is becoming a captive moulder, the cost of installation may also be included.

The designer then chooses the appropriate grade of the material and the computer calculates and displays the pressure drops In the various sections. The operator can alter the following variables and note the overall effects on the process: • melt temperature As there are four cavities, 250 shots are required. 93 h 3600 • mould temperature • injection rate • hot and cold runner dimensions Again assuming that there is a 5% loss due to imperfect moulding and 15% down time, the length of the run for 1000 mouldings is given by: • maximum injection pressure • screw-back pressure • cavity thickness • efficiency of mould cooling.

24 x 1 0 3 = 0 . 3, namely Cp = 1 . 1 x 0 . 0 1 5 x 3 . 231p Cost per 1 0 0 0 = £ 5 2 . 75 = £6000 During the year 10 products are made. Therefore the cost per product Cp = fiQiKi IO 5 products = 5 6 ton A 6 0 t o n m a c h i n e s h o u l d therefore be adequate, but it would leave little margin. 2 find the shot size of a machine of clamp force 6 0 ton. The answer is about 80g. 1 find the shot size factor for a shot size of 4 x 15g. 205. 3g On these two criteria the 6 0 ton machine s e e m s sufficient.

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


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