![]() On the other hand, the fracture of glass fiber will be more, and the mechanical properties of the fiber will be reduced. The compression ratio is too small to produce less heat, easy to plasticization and poor performance. L/D too large materials stay in the barrel for too long, excessive heat can cause degradation and affect the performance of products. It is best to choose a mutant screw with a reverse ring at the top, which has a large surface hardness and wear resistance, and the ratio of the length to diameter ratio not L/D = (15~20):1 compression is about 3:1. PET can only be molded by a screw type injection molding machine in general. Injection molding is mainly used to enhance the molding of PET. In addition, the tip of the nozzle hole is best processed as a reverse cone as shown in figure -1, so that the molten material in the flow channel and the nozzle can be cut off conveniently. In order to prevent the nozzle clogging, a higher power heater should be installed. The melting point of the enhanced PET is up to 260 ℃. The length of the nozzle hole of the injection machine should be as short as possible, and the diameter of the injection machine should be controlled around 3mm. The screw usually needs to be hardened to avoid wear after long term use. A screw type injection machine is usually used. The injection molding method is mainly used to enhance the molding of PET. If lower mold temperature is used, transparent products can be obtained by using non – filled PET materials. Special additives such as mica can be added to PET to minimize the bending deformation. The transparent products made with PET have glossiness and heat distortion temperature. The crystallinity of the material can be improved by adding a crystalline reinforcing agent. For glass fiber reinforced PET materials, bending deformation is very easy to occur at high temperature. PET has a strong hygroscopicity at high temperature. The glass conversion temperature of PET is about 165℃, and the temperature range of the material is 120~220℃. ![]() Therefore, the property of flow of melted material is changed mainly from the pressure. The rheological property of PET is better in the melting state, and the influence of pressure on the viscosity is larger than that of the temperature. At present, the most used by customers is the GF-PET, mainly for the bottle preform. PET chemical name is Polyterephthalate alcohol ester, also known as polyester. For PET for injection molding, technical personnel need to consider many factors. PET plastic injection molding process is one of the very important technology for processing plastic, PET plastic bottles, most of the plastic packaging plant will adopt blow molding production process, but the injection molding process has especially the unique processing advantages. It will help PET making factory get useful knowledge in few minutes. The content includes PET property, features, injection molding process, molding machines, process conditions, processing ways,etc. This product compiles with food contact regulations, so it can be used in all types of packaging.Abstract: PET plastic injection molding process is one of the very important technology for plastic processing.This blog systematically introduces PET processing by plastic injection molding machines. NTC SLU, being a colouring specialist, can include it in the production of PET dyes, either as a masterbatch or liquid. This product does not interfere with the preform colouring. – In liquid form, with dosing through a 0.2% pump during injection. – In masterbatch form, with a recommended dosage of 2%. ![]() We have two presentations of this product: – increases the speed of the preform in the blowing rail, which increases production by preventing jams in the blowing line, thus providing less friction resistance. The Slider for PET preforms, due to its nature, brings several improvements during the injection blow moulding process, such as : NTC SLU’s Slider Colorpet, for PET preforms, thanks to its unique formulation, allows the preforms to slide relative to each other by repositioning themselves inside the bag, increasing the amount of preforms that can be stored in an octavin by 20%. Octavins with large empty spaces caused by the geometry of the preform create the need for space, decreasing the profitability of the warehouse and increasing transport costs. One of major disadvantages of PET preform manufacturers is the large space required to store this material. A new development for injection moulding of PET preform s, adding to our list of additives and colorants for polymers and resins. ![]()
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