注塑模具venting-文庫吧
2025-07-17 16:51 本頁面
【正文】 e only to the specific material designated。 these data may not be valid for such material used in bination with any other materials or additives or in any process, unless expressly indicated otherwise. The data provided should not be used to establish specification limits nor used alone as the basis of design。 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 air to about 22 bar ? cavity pressures in phone moulding can go up to 3000 bar ? fast fill speed gives best surface finish (resinrich surfa
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