尼龙成型制导.pdf

Molding Guide ® Minlon mineral reinforced nylon resin Start with DuPont Resin Description Melt Temperature Minlon® is the DuPont trademark for its engineering Typical melt temperatures for each resin are shown thermoplastic resins. The present grades of Minlon® in Table 1. For optimum toughness, use melt are mineral and mineral/glass reinforced nylon 66 temperatures in the middle of the typical range. resins. Mineral particles and glass fibers are chemi- Higher temperatures can be used to improve the cally bonded with nylon polymer to provide a surface appearance. material exhibiting the excellent chemical resis- tance and retention of properties at high tempera- Nozzle Temperatures tures characteristic of nylon, while enhancing A reverse taper nozzle is recommended. Typical stiffness, strength, and heat resistance. temperatures are listed in Table 1. Higher nozzle temperatures may be necessary during start-up to It is important to point out that these compositions compensate for cold molds and prevent premature are reinforced, not filled , resins, meaning that there freeze-off. is a chemical bond between the nylon and the mineral or mineral and glass particles, thus greatly Mold Temperature enhancing the tensile and stiffness properties. Mold temperatures in the 65–100°C (150–210°F) Minlon® also exhibits better dimensional stability range are normally used, although temperatures and creep resistance than unreinforced nylon and between 100–115°C (210–240°F) are sometimes lo