| 摘要 |
Gas assisted injection moulding of plastic materials offers opportunities for overcoming some of the problems of conventional injection moulding, in some cases for improving the quality of moulded articles, and in others for widening the scope of design of moulded products. This invention comprises a method of improving the control of delivery of gas, normally nitrogen, to the mould tool by more precisely time phasing the pressures required within the gas, and also for controlling the rate of increasing and reducing gas pressures within the mould production time cycle. The invention can be applied to multi cavity moulds and larger complex mouldings which benefit from injecting gas in more than one position. This invention includes the use of linear displacement transducers as alternatives to time controllers. |
