老司机91精品网站在线观看_91在线精品国产丝袜超清_国产精品久久久久久影院_欧美日韩高清在线

Injection molding machine suppliers in plastic classification plastic is polymer, under moderate pressure, can deformation or injection mold. This is different from the high rigid and non-plastic recovery rubber. It can be divided into two types: thermoplastic and thermosetting plastic.

There are two primary types of non-crystal and crystallographic thermoplastics: non-crystalline and crystalline. Non-crystalline thermoplastics are generally solid, bright and rigid, and are low - and low-impact materials. Crystalline plastics also contain non-crystalline materials, called semi-crystalline thermoplastics. This type of plastic is generally softer and more patient, but it has a higher thermal deformation than non-crystalline thermoplastics, which is semi-transparent or opaque, and has a large shortening rate and high specific heat.

Plastic activity inspection because of the large plastic injection molding methods are all melt processing, such as injection molding and extrusion, so it is extremely important to check the amount of plastic activity. Although many experiments have been set up to check these functions, they can be divided into two types: low shear rate and high shear rate.

The activity rate (FR) is generally indicated by MFR and MET, and they are not separated from the flow index (melt activity pointer) of the mehflow ratet9, which means the same. Because the test is easy to understand, it is widely used. When heated plastic material (PE) under the specified temperature, pressure injection hole of a specification (mould), very minutes number of MFR, such as MFR,2.16 (190) = 2.3, which indicate the temperature of 1900 c, the use of the pressure of 2.16 kg, and under the condition of the heavy, very clock contains 2.3 g of plastic extruding.

The ratio of the length of the activity to the thickness of the activity is another way to check the simplicity of the activity. The experiment is carried out on the injection molding machine with the typical injection molded parts. The effect is indicated in proportion. If the ratio is 150:1, then the wall thickness of the injection molded parts is about 1mm, and the maximum length of the activity length is about 150mm. Injection molding machine supplier.