What problems will be encountered after injection molding with color masterbatch?
Frequently Asked Questions after Adding Color Masterbatch Injection molding Under the sun, there are stripe-like pigment strips in the product. This problem needs to be considered from two aspects: plastic physical and mechanical properties and plastic molding process: 1. The temperature of the injection molding equipment is not well controlled, and the color master cannot be thoroughly mixed with the resin after entering the mixing chamber. 2. The injection molding machine does not add a...
Do you understand the characteristics and processes of PBT injection molding materials?
Typical applications of PBT -polybutylene terephthalate: household appliances (food processing blades, vacuum cleaner components, electric fans), electrical components (switches, motor casings, mobile phone covers, fuse boxes, computer radiators, Computer keyboard keys, etc., automotive industry (heatsink windows, body panels, wheel covers, door and window components, etc.). Mold temperature: 40 to 60 C for unreinforced materials. The cooling channels of the mold are well designed to reduce the...
What are the methods for energy saving and consumption reduction of injection molding machines?
The working principle of the injection molding machine is similar to that of the syringe for injection. It is to inject the plasticized molten state (ie, the viscous flow state) into the closed cavity by the thrust of the screw (or plunger). The process of obtaining the product after curing and setting. Injection molding is a cyclic process, and each cycle mainly includes: quantitative feeding - melt plasticizing - pressure injection - filling mold cooling - mold extraction. After removing the...
Do you understand the formation of back pressure during injection molding?
The formation of back pressure during injection molding machine processing is as follows: First, the formation of back pressure During the melting and plasticizing process of the plastic, the melt is continuously moved to the front end of the barrel (measuring chamber), and more and more, gradually forming a pressure to push the screw backward. In order to prevent the screw from retreating too fast, and to ensure that the melt is evenly compacted, it is necessary to provide a reverse pressure...
Five major hazards and solutions for overheating of injection molding machines
There are five major hazards in the temperature of the injection molding machine : the thermal deformation of the machine, the viscosity of the oil is reduced, the rubber seal is deformed, the oxidation of the oil is accelerated, and the component pressure of the air is also lowered. One of the hazards: thermal deformation of the machine The moving parts with different thermal expansion coefficients in the hydraulic components are stuck due to the smaller matching clearance, which causes...
Basic knowledge about plastic injection molding machines
Typical injection molding machines include injection devices, clamping devices, hydraulic systems, and electrical control systems. The injection molding machine has a dense plastic product that can be molded in a complex shape, accurate in size or with metal inserts. It is widely used in electromechanical, automotive, transportation, building materials, packaging, agriculture, culture and health, national defense, and people's daily life. All areas of life. The injection molding process has...
Inventory application of injection molding process in automotive plastic parts
Due to the unique characteristics of the plastic parts of the complex parts of the automobile, the injection molding needs to fully consider the following factors: the drying treatment of the materials, the new requirements of the glass fiber reinforced materials on the screw, the driving form and the clamping structure. Wait. First, when the commonly used resin materials such as automobile bumpers and instrument panels are modified resins such as modified PP and modified ABS, the resin...
Injection molding process for ABS
ABS is commonly known as acrylonitrile butadiene styrene and is a copolymer of three monomers of acrylonitrile-butadiene-styrene. Due to the different ratios of the three monomers, different properties and melting temperatures can be obtained. If the ABS is blended with other plastics or additives, it can be expanded to ABS with different uses and properties, such as impact grade and heat resistance. , flame retardant grade, transparent grade, enhanced grade, etc. The fluidity of ABS is between...
Introduction to the use of lubricating oil in various systems of plastic injection molding machines
The injection molding machine is a thermoplastic molding device that plasticizes solid plastic and then injects it into a closed cavity by means of a screw at a certain pressure and speed, and after curing and setting, obtains the product. Injection molding machines are generally composed of major components such as injection devices, clamping devices, frames, gearboxes, hydraulic and electrical systems. In the injection molding process, the injection molding machine not only has the rotation,...
PBT injection molding process and its precautions
1, PBT process characteristics PBT has a distinct melting point, melting point of 225 ~ 235 °C, is a crystalline material, crystallinity up to 40%. The viscosity of PBT melt is not as great as the shear stress due to the influence of temperature. Therefore, in the injection molding, the influence of injection pressure on the melt flow of PBT is obvious. PBT has good fluidity in the molten state and low viscosity, second only to nylon, and it is prone to "casting" during molding. PBT molded...
Five major hazards and treatment methods for overheating of injection molding machines
There are five major hazards in the temperature rise of the injection molding machine : the thermal deformation of the machine, the viscosity of the oil is reduced, the rubber seal is deformed, the oxidation of the oil is accelerated, and the component pressure of the air is also lowered. Hazard 1: making the machine thermally deformed The moving parts with different thermal expansion coefficients in the hydraulic components are stuck due to the smaller matching clearance, which causes...
PP polypropylene injection molding properties
PP polypropylene injection molding properties Typical application range: Automotive industry (mainly using PP with metal additives: fenders, ventilation ducts, fans, etc.), instruments (dishwasher door liners, dryer ventilation ducts, washing machine frames and covers, refrigerator door liners, etc.), Japan Use consumer products (lawn and garden equipment such as lawn mowers, sprinklers, etc.). Injection Molding Process Conditions: Drying: Drying is not required if stored properly. Melting...
Analysis of the solution for floating fiber in the injection molding product
When the mold is tested, the operation of each part is basically normal, but the product has a serious appearance quality problem, and the surface has a radial white mark, and this white mark tends to be serious with the increase of the glass fiber content. This phenomenon is commonly called “ "Floating fiber" is a kind of surface defect that is easy to appear in glass fiber plastic products, which is unacceptable for automotive plastic parts with high appearance requirements. Cause Analysis:...
The main types of injection molding
Injection molding is a method of producing shapes for industrial products. Products are usually injection molded from rubber and plastic. Injection molding can also be divided into injection molding and die casting. Injection molding machine (referred to as injection machine or injection molding machine) is the main molding equipment for making thermoplastic or thermosetting materials into plastic products of various shapes by using plastic molding die. Injection molding is realized by...
The most practical POM injection molding process
POM has good physical, mechanical and chemical properties, especially with excellent resistance to friction. POM is a crystalline plastic with a sharp melting point. Once the melting point is reached, the melt viscosity drops rapidly. Decomposition occurs when the temperature exceeds a certain limit or the melt is heated for too long. Copper is a POM degradation catalyst and copper or copper materials should be avoided where it is in contact with the POM melt. 1, plastic processing POM has a...
5 key points of the spray-free material injection molding process
The five key points of the spray-free material injection molding process are as follows: 1. Drying control - below 5% water content Spray-free materials, like most materials, absorb moisture from the air. Drying must be carried out before the forming process, otherwise it may cause the surface of the product to be silver and watery and affect the gloss of the surface of the product. It is usually required to control the moisture content of the spray-free material after drying to be less than...
Analysis and Calculation of Cooling Time of Plastic Injection Molding Parts
Injection production, plastic injection molding cooling time of the workpiece about 80% of the entire injection cycle. Poor cooling often results in warpage of the article or surface defects that affect the dimensional stability of the article. Properly arranging injection, holding pressure and cooling time can improve product quality and productivity. The cooling time of the part usually refers to the period of time when the plastic melt is filled from the cavity of the injection mold to the...
What are the common processing techniques for injection molding of plastic products for home appliances?
[Jiuzhi Plastics News] The molding process of plastic products for home appliances mainly includes injection molding, extrusion molding, thermoforming, hollow molding, lamination molding, compression molding, transfer molding, foam molding, casting molding, and insert molding. , sealing and casting, etc., which are mainly injection molding. In recent years, some new plastic processing technologies and new equipment have been widely used in the molding of household electrical appliances, such as...
Injection molding process characteristics and precautions for transparent plastics
As a transparent plastic , first of all, to ensure high transparency, secondly, strength, impact resistance, wear resistance, heat resistance, chemical resistance, water absorption is small, in order to meet the transparency requirements in use. For the selection of transparent plastics, PC is an ideal choice, but its high price and difficult injection molding process, so PMMA is often used, and PPE can be used in packaging and containers because it has to be stretched to get good mechanical...
Injection Molding and Pressing Two Process Bottle Caps
Bottle caps are a detail that is often overlooked by consumers, but for manufacturers, this is a big problem. Mr. Li Keping of Italy's Jetflex has many years of research on bottle caps and cap moulds. “Manufacture of plastic caps looks simple, but the manufacture of plastic cap moulds has a very high level of expertise.” Jetflex is known for designing and manufacturing multi-cavity, high-precision, hot runner injection molds. In 2000, Jetfield developed a 64-cavity rapid-mold cap mold, and...
Causes and solutions for PP injection molding failure
The causes and solutions for PP injection molding failure are as follows: I. Note Fault analysis and troubleshooting: (1) The process conditions of transparent PP plastic are not properly controlled. Should be adjusted appropriately. (2) The injection capacity of the injection molding machine is less than the weight of the plastic part. Should be replaced with a larger size injection molding machine. (3) The flow path and gate cross section are too small. Should be appropriately increased. (4)...
PA performance and injection molding process summary
This paper mainly introduces the performance of engineering plastics PA and the injection molding process, the selection of equipment in the actual production, product modeling and mold design considerations. PA-polyamide, also known as nylon, is a general term for a large class of amide-type polymers. The most common are PA6, PA66, and PA1010. Recently, with the development of the IT industry, the use of a new type of polyamide-PA46 has increased dramatically, and it has been used to replace...
Reasons for the failure of injection molding products and their elimination
The reasons for the failure of injection molding products are as follows: 1. The equipment is not properly selected. When using the equipment, the maximum injection volume of the injection molding machine must be greater than the total weight of the plastic parts and nozzles, and the total weight of the injection can not exceed 85% of the plasticizing amount of the injection molding machine. 2. Insufficient supply. At present, the commonly used method for controlling feeding is a fixed volume...
