Summary of the injection molding process of five general-purpose plastics
Mastering the process performance and characteristics of various plastics is the basic professional knowledge that every injection molding worker must understand. Today, Jiuzhi Plastics Co., Ltd. tells you about the injection molding process of the five general-purpose plastics, as follows: 1. Polypropylene (PP) injection molding process PP is called polypropylene, because it has good anti-breaking performance, also known as "100 fold glue." PP is a translucent, semi-crystalline thermoplastic...
Two-component injection molding new equipment available
Germany's Kraff Maffei recently announced that it will exhibit the KM 160-750CX injection moulding machine equipped with polyurethane mixing and metering devices at the 2004 International Plastics and Rubber Industry Exhibition in Düsseldorf. The machine was the first to successfully combine injection molding and reaction processes for the injection molding of thermoplastics and polyurethanes. This process called Skinform has successfully prepared a luxury car seat belt buckle ring,...
Application of modified nylon in injection molding process
When 30% glass fiber is added to PA, the mechanical properties, dimensional stability, heat resistance and aging resistance of PA are obviously improved, and the fatigue strength is 2.5 times that of unreinforced. The molding process of glass fiber reinforced PA is almost the same as that of unreinforced, but the injection pressure and injection speed should be appropriately increased due to the increased flow front, and the barrel temperature is increased by 10-40 °C. Since the glass fiber is...
Gas-assisted injection molding system highlights
The gas-assisted injection molding system directly injects nitrogen through a staged pressure control system into a plasticized plastic within a cavity of a human mold, so that the internal expansion of the plastic component forms a hollow, but the surface of the product remains intact. In recent years, gas assisted injection molding system technology has developed rapidly. At present, this technology has been applied to the production of many plastic parts, such as various packaging products...
Injection Molding Technology Overview
Injection molding is an engineering technology. It involves the transformation of plastics into useful products that can maintain their original properties. The important process conditions for injection molding are the temperatures, pressures, and corresponding action times that affect plasticizing flow and cooling. First, temperature control 1, barrel temperature The injection molding process requires controlled temperatures such as barrel temperature, nozzle temperature, and mold...
Causes of Defects in Injection Molding Parts and Remedies
Defects Name Characteristics of Injection Defects Possible Problems with Injection Molding Machines Recommended Remedies Differences in Size of Injection Moldings Changes in weight and size during the injection process exceed the capacity of the mold/injection molding machine/+plastic combination. 1. Insufficient plastic in the cartridge. 2. The range of temperature or fluctuation of the cartridge is too large. 3. Injection molding machine capacity is too small. 4. Unstable injection pressure....
Long glass fiber reinforced polypropylene (PP) injection molding
In automotive engineering, the use of long glass fiber-reinforced polypropylene is increasingly used in dashboards, car front and bottom parts. Because of its low density, low price, and the advantages of recyclability, polypropylene is gradually replacing engineering plastics and metals in these applications. However, when long glass fiber-reinforced polypropylene increases the elastic modulus and impact resistance of the material, the polypropylene material merely satisfies the mechanical...
Belgium launches injection molding grade thin wall packaging
Totalfina petrochemical company of Belgium newly introduced injection molding grade thin wall packaging brand Finapro PPC 13612 and heavy packaging sheet grade PPC 7712. PPC 13612 is a heterogeneous copolymer that combines high impact strength, high rigidity and good processability. The research and trial results show that the grade is suitable for food packaging. Compared with thermoforming packaging, the cost is low, raw materials and energy consumption are small, the molding cycle is short,...
Computer-controlled injection molding new technology come out
Experts predict that the “smart blending” technology developed by the University of Cremonson in the United States will potentially change the way humans produce polymers, fibers, films and even all injection molded products. This new technology can accurately control the entire mixing process and the development trend of the internal structure of plastic products through the computer, so that the interior of the ultimate product has a functional structure that is only 1/10 of the diameter of...
Plastic Injection Molding New Process
Normal > Accurate plastic products, and the high degree of automation of the molding process, has a wide range of applications in plastic molding processing. However, with the increasing application of plastic products for hearing, people have put forward higher requirements for the accuracy, shape, function, and cost of plastic products. The traditional injection molding process has been difficult to meet this requirement, mainly in the production of a large area structure. When making...
UHMWPE Injection Molding New Technology
Ultra-high-molecular-weight polyethylene refers to linear polyethylene with an average molecular weight of 1.5 million or more. It has abrasion resistance that is unmatched by other general-purpose plastics and engineering plastics (the first place in plastics is 4 times higher than nylon, and is carbon steel. , 7 to 10 times that of stainless steel, impact resistance (first in plastics, 5 times that of ABS, 2 times that of polycarbonate), corrosion resistance, low temperature resistance,...
Pre-pressure method instead of high-performance injection molding
In recent years, reducing the wall thickness of plastic products has become a clear trend. One such application is in traditional thin-walled packaging products. Traditionally, the required thin walls have been achieved by increasing the injection capacity of the machine, but special designs must be made in advance. At present, a melt pre-compression method can be used as an alternative to high-speed injection. Reducing wall thickness has different purposes. For packaging products, the main...
Analysis of Injection Molding Process of 5 General Plastics
The injection molding process for the five general-purpose plastics is as follows: 1. Polypropylene (PP) injection molding process PP is called polypropylene, because it has good anti-breaking performance, also known as "100 fold glue." PP is a translucent, semi-crystalline thermoplastic with high strength, good insulation, low water absorption, high heat distortion temperature, low density and high crystallinity. The modified filler usually has glass fibers, mineral fillers, thermoplastic...
What are the 7 factors that need to be considered in the injection molding process?
The injection molding process should consider the following seven factors: First, the shrinkage rate Thermoplastic molding shrinkage is calculated as described above and form factors thermoplastic molding shrinkage effects are as follows: 1.1 Plastics In the molding process of thermoplastics, due to the volume change of crystallization, the internal stress is strong, the residual stress in the plastic parts is large, and the molecular orientation is strong, so the shrinkage rate is higher than...
Eighteen knowledge points that must be mastered by injection molding people
The eighteen knowledge that an injection molder must master is as follows: Shooting nozzle The melt usually flows from the nozzle into the nozzle, but with some molds, the nozzle is part of the mold because it extends to the bottom of the mold. There are two main types of nozzles: open shot nozzles and closed nozzles. In injection molding, open nozzles should be used more because they are cheaper and less likely to stay. If the injection molding machine is equipped with a depressurizing device,...
Summary of the causes of twelve injection molding defects
I. Analysis of the causes of bubbles in injection molded products In general, it is a gas interference problem if bubbles are found at the moment of mold opening. The formation of vacuum bubbles is due to insufficient filling or low pressure. Under the rapid cooling of the mold, the fuel at the corner of the cavity is pulled, resulting in a volume loss. Solution: (1) Increase the energy of injection: speed, time, pressure and amount of material, and increase the back pressure to make the...
Analysis of the problem of silver wire produced by injection molding
Injection molding produces silver filaments mainly because of the incomplete drying of the raw materials, caused by water or volatile components. When injection molding produces silver wire, it is first necessary to carry out the molding experiment with thoroughly dried particles. If it cannot be eliminated, other causes can be checked. The specific reasons for the production of silver wire are as follows: 1. Injection molding machine: (1) The barrel, the screw wears or the rubber head and the...
What should I do if there are air holes in the finished injection molding?
In the injection molding process, sometimes there are many small bubbles of the finished product, not only impact strength and mechanical properties of the finished injection molding, the appearance of the finished product price values are also greatly reduced, so when bubbles are finished, several factors can be checked, and Do the processing. Usually, when the thickness of the finished product is different, or when the mold has protruding ribs, the cooling speed of the plastic in the mold is...
How do injection molding companies reduce mold repair?
In the process of using the injection mold , it will inevitably lead to problems. However, the problem is that the number of repairs of the mold should be shortened as much as possible, which can greatly reduce maintenance costs and improve production efficiency. Ideally speaking, a mold design life of 300,000 beer, 50,000 tons of beer maintenance once, in addition to wearing parts of the spring thimble aprons in the production cycle, other parts do not need to change. But in fact, the general...
Plastic net tells about the solution of injection molding products
Injection molding refers to the plasticization and melting of plastic by injection molding machine, and then injection into the cavity of the molding die to form, after cooling and cooling, the melt is solidified and demoulded, and the injection molding machine is injection molded. Flash, also known as flash, overflow, and draping, mostly occurs at the position of the mold, such as: the parting surface of the mold, the sliding part of the slider, the gap of the insert, the pores of the ram,...
Introduction of New Ultra High Molecular Weight Polyethylene Injection Molding Technology
Ultra-high-molecular-weight polyethylene refers to linear polyethylene with an average molecular weight of 1.5 million or more. It has abrasion resistance that is unmatched by other general-purpose plastics and engineering plastics (the first place in plastics is 4 times higher than nylon, and is carbon steel. , 7 to 10 times that of stainless steel, impact resistance (first in plastics, 5 times that of ABS, 2 times that of polycarbonate), corrosion resistance, low temperature resistance,...
Telling about the injection molding process of crystalline plastics
In general, we refer to polymers with crystallinity above 80% as crystalline plastics . Common varieties are: PE, PP, POM, PA6, PA66, PET, PBT, etc. Crystalline plastics have obvious characteristics in injection molding production. Let's take a look at it: First, the characteristics of crystalline plastics 1. Mechanical properties: The crystal structure enhances the intermolecular force and enhances the toughness, but at the same time reduces the ductility and impact resistance; 2, optical...
High-speed and high-efficiency integrated precision injection molding equipment
High-speed and high-efficiency integrated precision injection molding equipment originated from Guangdong Provincial Economic and Trade Commission project “High-speed and high-efficiency integrated precision injection molding equipment”. The new equipment adopts the hydraulic excitation method to realize pulsating pressure-induced plasticization and injection molding on a single-cylinder injection plasticizing device. Its technology is at the international advanced level. The double-coupled...
7 parameters that must be paid attention to when setting the injection molding process
The following seven parameters must be noted when setting up the injection molding process: 1. Injection speed: The injection speed is slow, the plastic is carried out in the cavity, there will be more heat loss, the flow viscosity increases, and the use pressure loss increases; Higher rate of fire can often achieve higher precision, less deformed molded products, only through the thin and thick flesh, intense changes, corners and other areas, easy to appear poor appearance, and easy to produce...
