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How to improve plastic scratch resistance, wear resistance(plastic products)
1 Select the right matrix resin Usually ultra-high molecular weight polyethylene (PE-UHWM) is one of the most wear-resistant plastics, and the selection of PE-U·HWM can simply improve the wear resistance of the material. In addition, high crystallization, high regularity of the plastic is more wear-resistant, high hardness of the plastic is more wear-resistant, such as polystyrene composed of large molecules such as benzene rings do not wear. In polypropylene (
Why do the Plastic Products produced change color?
Color changes caused by plastic molding processing 1. During high temperature molding, the matrix resin is oxidized, degraded and discolored When the heating ring or heating plate of plastic molding processing equipment has been in a heating state due to loss of control, it is easy to lead to local temperature is too high, making the resin oxidation and decomposition at high temperature, for those heat-sensitive plastics, such as PVC, etc., this
7 common cutting problems and corresponding solutions (plastic products)
Connected particles are a series of particles connected to each other, that is, in some cases, the particles are connected by the membrane end to end or in a tangential manner. During the processing process, several process problems alone or together may cause this phenomenon to occur. For example, the processing water is too hot is a cause of the particle, in this case, the water temperature should be lowered to give sufficient quenching of the particle surface; In addition, the water flow speed is too low is also a cause of granulation, it will cause the particl
Aging phenomenon of polymer materials (plastic products)
Polymer materials include plastics, rubber, fibers, films, adhesives and coatings. Because they have many potential properties better than traditional structural materials, they are used more and more widely in the field of military and civilian products. However, in the process of processing, storage and use, due to the combined effect of light, heat, oxygen, water, high-energy radiation, chemical and biological erosion and other internal and external factors, the chemical composition and structu
Use and classification of adhesive for plastic products
There are many kinds of adhesives, which can be divided into many kinds according to composition, use and physical form. Here, the classification and use of adhesives from these three aspects are sorted out, hoping to help you. 01 Classification by composition 1, silicone adhesive It is a kind
Injection defects | thin-wall Injection Molding Parts warping deformation defect solution
Warping deformation is one of the common defects in the injection molding of thin shell plastic parts, because it involves the accurate prediction of the amount of warping deformation, and the warping deformation law of different materials and different shapes of injection parts is very different. When the amount of warping deformation exceeds the allowable error, it becomes a forming defect, and then affects the product assembly. Accurate prediction of warpage deformation of various kinds of increasing thin-wall
How to improve the impact strength of PA modified plastic products?
Injection molded nylon and glass fiber are generally raw materials modified with glass fiber. It has good rigidity and is the leader of rigid raw materials. Then we often encounter a phenomenon, what if the rigidity of the high material impact resistance is poor? Impact strength is also known as impact strength, that is, impact strength. The size of this information indicates the flexibility of the data. However, stiffness and flexibility are two relative information contents. Stiffness increases, ductility decreases. Bu
Chemical foaming agent (Engineering plastic products
Chemical blowing agent Chemical blowing agent is also known as decomposable blowing agent. They can be uniformly dispersed in the resin, decomposed by heat, and can produce at least one gas. Can be divided into inorganic blowing agent and organic blowing agent two categories. Organic blowing agents are the main blowing agents used in plastics, mainly azo, nitroso and sulfonyl hydrazides. There are also some blowing agent components whose foaming gas is released through an endothermic reaction bet
Physical blowing agent (Engineering plastic products
Physical blowing agent Physical blowing agent is mainly through the change of the physical state of blowing agent to form the bubble hole in the plastic. The ideal physical blowing agent should have the following conditions: ① Inert, non-toxic; ② Compatible with resin;
2023.11.16 China Xiamen medicine machine mold accessories exhibition
This time we went to the province to participate in an industry high-end exhibition! Although there is hard work, pay, of course, there are a lot of harvest! However, all the hard work, is very worthwhile!
Eight ways to reduce the cost of injection molding
First, the production workshop The layout of the production workshop is mainly considered from two aspects: to meet the production needs, optimize the layout according to the production process, and meet the requirements of flexible energy use under specific production conditions. 1, the power supply, in order to meet the stable production of power required at the same time with an appropriate margin, not too much surplus caused by excessive non
Introduction to several kinds of inorganic fillers commonly used in plastics products
Glass fibre Glass fiber is often used in engineering plastics filler, its main components are silica, and other derived metal oxides, the current international mainstream production process for the pool kiln wire drawing method; According to the amount of alkali content in glass, it can be divided into alkali-free glass fiber, medium alkali glass fiber and high alkali glass fiber; The glass fiber commonly used in engineering plastics is mainly alkali free cut glass fiber and non-twist long glass
Analysis and solution of common problems in blowing film (14(injection molding products)
14, thin film fish eye Reason: Fish eyes are mainly additives in raw materials, low molecular weight resin and dust, etc., condensed on the mouth mold during processing, accumulate a certain amount after being taken away by the film, thus forming fish eyes on the film. solution ① After a certain time, increase the screw speed, increase the melt extrusion pressure, and take away the precipitates.
Analysis and solution of common problems in blowing film (13(injection molding products)
13. The film has an odor Reason 1: the smell of the resin raw material itself; Reason 2: The extrusion temperature of the molten resin is too high, resulting in the decomposition of the resin, resulting in odor; Cause 3: The membrane bubble is not cooled enough, and the hot air in the membrane bubble is not cleared. solution
Analysis and solution of common problems in blowing film (12(injection molding products)
12. The surface of the film is rough and uneven Reason 1: extrusion temperature is too low, the resin plasticization is poor; Reason 2: Extrusion speed is too fast. solution (1) Adjust the temperature setting of extrusion, and appropriately increase the extrusion temperature to ensure that the resin is plasticized well;
Analysis and solution of common problems in blowing film (11(injection molding products)
11. The membrane vesicle is unstable Reason 1: the extrusion temperature is too high, the fluidity of the molten resin is too large, the viscosity is too small, and it is easy to fluctuate; Reason 2: The extrusion temperature is too low, the discharge amount is less; Reason 3: The air volume of the cooling air ring is unstable, and the cooling of the membrane bubble is not uniform;
Analysis and solution of common problems in blowing film (10(injection molding products)
10. The transverse tensile strength of the film is poor Reason 1: The cooling speed of the cooling wind ring is too slow; Reason 2: The traction speed is too fast, and the difference between the blowing ratio is too large, so that the longitudinal fibrosis is generated, and the transverse strength is worse. solution (1) Appropriately reduce the traction speed to match
Analysis and solution of common problems in blowing film (9(injection molding products)
9, the film longitudinal tensile strength is poor Reason 1: The temperature of the molten resin is too high, which will reduce the longitudinal tensile strength of the film; Reason 2: The blowing ratio is too large and does not match the traction ratio, so that the transverse orientation and tensile strength of the film are increased, and the longitudinal tensile strength will become worse; Reason 3: The tracti
Analysis and solution of common problems in blowing film (8(injection molding products)
8, the heat sealing performance of the film is poor Reason 1: The frost line is too low, the polymer molecules are oriented, so that the performance of the film is close to the directional film, resulting in reduced heat sealing performance; Reason 2: The blowing ratio and traction ratio are too large, and the film will have tensile orientation, which affects the heat sealing performance of the film; solution (1) Adjust the size of the air volume in the wind ring, make the dew point higher, and blow and pull under the melting point of
Analysis and solution of common problems in blowing film (7(injection molding products)
7. The thickness of the film is thin Reason 1: die gap is small, the resistance is too large, so the film thickness is thin; Reason 2: The air volume of the cooling wind ring is too small, and the film cooling is too slow; Reason 3: The traction speed is too fast, the film is stretched excessively, and the thickness is thinned. solution
Analysis and solution of common problems in blowing film (6 (injection molding products)
6. The thickness of the film is too thick Reason 1: die clearance and extrusion volume is too large, so the film thickness is too thick; Reason 2: The air volume of the cooling wind ring is too large, and the film cools too fast; Cause 3: The traction speed is too slow. solution ① Adjust the die gap; (2) Appropriately reduce the air volume of the wind ring, so that the film is further blown, so that its thickness becomes thinner; ③ Increase the traction speed appropriately.
Analysis and solution of common problems in blowing film (5 (injection molding products)
5, the film thickness is not uniform Reason 1: The uniformity of the die gap directly affects the uniformity of the film thickness, if the die gap is not uniform, some parts of the gap is larger, some parts of the gap is smaller, resulting in more or less extrusion volume, therefore, the formed film thickness is inconsistent, some parts are thin, some parts are thick; Reason 2: The temperature distribution of the die is uneven, with high and low, so that the thickness of the film after blowing is uneven; Reason 3: The air supply volume around the co
Analysis and solution of common problems in blowing film (4 (injection molding products)
4. The film has fog-like water pattern Reason 1: Low extrusion temperature, poor plasticization of resin; Reason 2: The moisture content of the resin is too high. solution ① Adjust the temperature setting of the extruder, and appropriately increase the extrusion temperature. ② The resin raw materials are dried, and the water content of the resin is generally required not to exceed 0.3%.
Analysis and solution of common problems in blowing film (3 (injection molding products)
3. The film folds Reason 1: film thickness is not uniform; Reason 2: The cooling effect is not enough; Reason 3: The blowing ratio is too large, causing the membrane bubble to be unstable, swinging around and back, and easy to wrinkle; Reason 4: The Angle of the herringbone splint is too large, the membrane bubble is flattened in a short distance, so the film is also prone to wrinkle; Reason 5: The pressure on both sides of the traction roller is inconsistent, one side is high and the other is low; Reason
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