4. Mold rotates on horizontal turn table, which is more stable than vertical rotation and has no inclination. It helps for life of mold, especially large molds.

Runners and Gates of PET Injection Mold All conventional types of gates can be used. Gates should be 50–100% of the part thickness.

1. Use robot arm to switch the molding part instead of rotary table method, it will be helpful to save investment cost of equipment.

Chemical and Physical Properties PET is an aromatic polyester produced from the polymerization of either terephthalic acid (TPA) or dimethyl ester terephthalic acid (DMT) and ethylene glycol (EG). The glass transition is approximately 165°C [330°F] and the material crystallizes over a temperature range from 120°C–220°C [248°F–428°F].

Multi-component molding is an efficient and cost effective technology for molding custom plastic parts with two or three plastic resins or colors in a single operation, and at faster cycle time and flash free.

2. The disadvantage is that the injection molding of product #1 and product #2 cannot be injected at the same time, resulting in loss of efficiency.

ASM has mastered this technology and has manufactured parts using multi-component molding process for many years. With 4 sets 2K injection machines in house, and with our leading 2K technology, we are capable of manufacturing different types of 2K molds.

Typical Applications of Polyethylene terephthalate (PET) Automotive – mirror backs – grille supports – head lamp reflectors – alternator housings Electrical applications – motor housings – electrical connectors – relays – switches – microwave oven interiors Industrial applications – furniture chair arms – pump housings – hand tools – PET bottles and containers

1. Cost efficiency, it reduced core side compare with transfer method, but it still can achieve the 2k injection process in one mold.

1. Production in same machine with double time of cavities compared with normal mold. It can increase production efficiency.

Polyethylene terephthalate (PET) has excellent chemical resistance and barrier properties, good strength, rigidity, fatigue endurance, and abrasion resistance.

2. Good quality stability: the two molding steps can be done in one cavity and it can avoid part warpage issue during the mold open and part transfer. It is more stable than over-molding method.

PET is highly sensitive to moisture at high temperatures and exhibits excessive warpage when reinforced with glass fibers. The promotion of crystallinity is achieved through adding nucleating agents and crystal growth accelerators. Crystalline moldings exhibit high modulus, gloss, and heat distortion temperatures. Warpage is minimized by the addition of particulate fillers such as mica. When low mold temperatures are used, transparent moldings can be obtained with unfilled PETs.

The technology is relatively mature compared with the traditional over-molding tech, double color can be injected at the same time, high efficiency and good stability, this  technology can be applied to a variety of products.

2. With rotation core method, it can realize the various injection of material / color. Especially for small product, it will be more controllable on part dimension than rotary table method.