注塑模具venting-免費(fèi)閱讀
【正文】 HTN 53G50 Roger Wilkinson Technical Manager DuPont Engineering Polymers Hemel Hempstead, UK January 2022 The information provided in this documentation corresponds to our knowledge on the subject at the date of its publication. This information may be subject to revision as new knowledge and experience bees available. The data provided fall within the normal range of product properties and relate only to the specific material designated。 they are not intended to substitute for any testing may need to conduct to determine for yourself the suitability of a specific material for your particular purposes. Since DuPont cannot anticipate all variations in enduse conditions DuPont makes no warranties and assumes no liability in connection with any use of this information. Nothing in this publication is to be considered as a license to operate under or a remendation to infringe any patent rights. CAUTION: Do not use this product in medical applications involving permanent implantation in the human body. For other medical applications see DuPont Medical Caution Statement, H51459. 174。 Registered trademark of DuPont Efficient Venting Page 2 What’s a vent? ? gap ? big enough to let the air out ? small enough to keep the plastic in ? some polymers are viscous, they can have deeper vents ? nylons have very low viscosity, they must have shallower vents ? this makes it more difficult to effectively vent tools designed for moulding nylon, especially when using the very fast injection fill times that are needed for nylons with high levels of glass fibre reinforcement ? HTN53G50 has 50% by weight glass fibre reinforcement Efficient Venting Page 3 Why vent injection moulds? ? cavity (and any cold runner) is full of air at 1 bar ? most diesel engines work by pressing a
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