(3) When the silver streaks always appear in a certain position, it is necessary to check whether there are surface scars on the surface of the corresponding mold cavity. If there is a reflection of the surface scars, the surface scars of the die cavity should be removed by machining.

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Craftfac Machinery Ltd, also known as Craftfac., is a Chinese company which has headquarter in shanghai, founded in 2002. Craftfac specializing in They offer flexible pricing options, including low-volume production runs, allowing smaller companies to access high-quality injection molding services at affordable rates.

The Chinese injection molding industry is home to a diverse range of companies that offer affordable services without compromising on quality. The top 10 companies highlighted in this blog understand the importance of cost-effectiveness and have implemented various strategies, such as process optimization, lean manufacturing, and value engineering, to provide competitive pricing. By choosing one of these reputable companies, businesses can access reliable injection molding services at affordable rates, contributing to their success in today’s competitive market.

IN3DTEC rapidly delivers prototyping & scaled production on demand to help project designers and engineers accelerate new product introduction. We make excellent products from your ideas.

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Ningbo Haida Plastic Machinery Co., Ltd, commonly known as Haida Machinery, is a Chinese company specializing in the design, manufacturing, and distribution of plastic injection molding machines. The company was established in 1992 and is headquartered in Ningbo, Zhejiang Province, China.

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The injection molding process of plastic raw materials is mainly plasticizing, filling, cooling and shaping to become finished products. It is a process of heating and then cooling, and also the process of plastic changing from particles to different shapes. In this article, we will explain the PP injection molding process from the perspective of different stages and we present 11 common defects in Polypropylene injection molding.

(4) When different kinds of resins are mixed, there will be silver streaks. Mixed use of different resins should be prevented.

Zhong tian is a Chinese manufacturing company located in Guangdong, China. Founded in 2007. It specializing in rapid prototyping, and injection molding services.  specializes in providing injection molding services for small to medium-sized production runs, with affordable price.

(2) The structure design of the gating system is unreasonable. The structure of runner and gate should be improved to avoid turbulence during filling.

Chen Hsong Holdings Limited is a manufacturer and supplier of plastic injection moulding equipment and systems. The company was established by Dr. Chiang Chen in a small village workshop in Hong Kong in 1958. Chen Hsong specializes in providing injection molding services for small to medium-sized production runs.

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(3) The volatile content in the raw material is too high or the mold exhaust is poor. The volatile substances in the raw materials should be removed and the exhaust system of the mould should be improved.

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(4) Poor mold exhaust, residual air in the mold cavity caused under injection. The exhaust system of the mold should be improved.

Plastic retyping depends on the mold or mold head. The injection molding product is three-dimensional, and the mold is more complex, and the shrinkage rate should be considered. Other products are flat, strip and needle like continuous product heads.

(4) The wall thickness of plastic parts changes too much. The shape and structure of plastic parts should be designed reasonably to avoid rapid change of wall thickness.

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Donghua Machinery Ltd, also known as Ningbo Donghua Machinery Co. Ltd., is a Chinese company specializing in the design, manufacturing, and distribution of plastic injection molding machines. The company was founded in 1982 and is headquartered in Ningbo, Zhejiang Province, China. They offer flexible pricing options, including low-volume production runs, allowing smaller companies to access high-quality injection molding services at affordable rates.

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(2) Mold temperature is too low, barrel temperature is too high. The mold temperature should be increased properly to reduce the barrel temperature.

Most of PP plastic injection molding processing depends on screw to drive the fluidity, so the design of screw has a great influence. The diameter of screw affects the output, the compression ratio affects the pressure value, and also affects the output and finished product effect, including the mixing effect of various materials. The flow of raw materials mainly depends on the heater, but the friction of raw materials will also produce friction heat energy to accelerate the fluidity, so the screw compression ratio is small, the flow is small, and the rotational speed must be increased, resulting in more friction heat than the screw with large compression ratio.

(2) The injection capacity of injection molding machine is less than the weight of plastic parts. The injection molding machine with larger specifications should be used.

(1) When the size of runner and gate of thick wall plastic parts is small, it is easy to produce surface pores. The size of runner and gate should be enlarged properly.

Most of the plastic machines are designed like syringes. The extrusion force driven by the screw will cause huge pressure at the small outlet and improve the production efficiency. When the mold head is designed as a plane, how to make the raw materials evenly distributed on the whole surface, the design of the hanger mold head is very important. Pay attention to the extrusion opportunity increases the fishgill pump to stabilize the raw material supply.

The elongation of finished products can be enhanced by processing, and the molecular weight distribution will also affect the elongation effect in high-speed production. All extruded products, including fibers, have different elongation. Vacuum and air compression molding can also be regarded as another form of extension.

Husky Injection Molding Systems (Shanghai) Co. Ltd is a subsidiary of Husky Injection Molding Systems Ltd, a leading global supplier of injection molding equipment and services. The company was established in 1953 and has its headquarters in Bolton, Ontario, Canada.. They prioritize efficiency and process optimization to minimize overhead costs, allowing them to provide clients with competitive pricing while adhering to stringent quality standards.

Any raw material has the problem of shrinkage rate, which is caused by the internal stress caused by thermal expansion, cold contraction and crystallization. Generally speaking, thermal expansion and cold shrinkage are easy to overcome, which can be achieved by prolonging cooling time and maintaining pressure continuously. Crystalline raw materials tend to have larger shrinkage difference than non crystalline materials. PP is about 16% of 1000, but ABS is only about 4%. This part needs to be overcome in the mold or by adding additives to reduce shrinkage rate.

(1) Mold temperature is too high or insufficient cooling. The mold temperature should be reduced or the cooling time should be prolonged.

Rilong Mold Co. Ltd., also known as Rilong Precision Mold, is a Chinese company specializing in the design and manufacturing of precision molds for the plastic injection molding industry. Established in 1996, the company is headquartered in Shenzhen, Guangdong Province, China. Rilong stands out for its commitment to affordability without compromising on product quality.

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(3) If the molding temperature is too high or the injection pressure is too low, the surface of the plastic parts will produce pores. The molding temperature should be reduced and the injection pressure should be increased.

In addition to pouring raw materials into runner gate, injection mold also has cooling channel cooling material design. Extrusion molding depends on the cooling channel in the roller to achieve the cooling effect, except for the air knife, cooling water directly poured on the blowing bag, and hollow air blowing and other cooling methods.

(6) The design of gating system is unreasonable. The filling performance of the gating system should be improved to make the melt flow smoothly in the mold cavity.

Founded in 2014, with headquarter in Shanghai, China. IN3DTEC specializes in providing affordable manufacturing services including 3D Printing, CNC machining, and injection molding solutions to a wide range of industries. Their streamlined operations, optimized material utilization, and lean manufacturing practices contribute to their ability to offer cost-effective services. IN3DTEC has built a reputation for offering budget-friendly injection molding service.

Good results and PP pyrolysis characteristics are that it is best to make the raw materials flow smoothly to the die head during production, so as to avoid the phenomenon of insufficient filling or reflux. Reflux represents that the flow rate of raw materials is faster than the output rate, and the average flow efficiency is increased, which is one of the available methods for processing, but it also causes abnormal MFR distribution, which may lead to instability The defect rate may increase.

The heater of the unit makes the raw material particles melt into liquid flow gradually. It is mainly suitable to adjust the temperature of different raw materials. Increasing the temperature will accelerate the flow of raw materials, which can increase the efficiency, but it does not necessarily guarantee the yield. Therefore, a proper balance must be achieved.

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Zhejiang Sound Machine Manufacturing Co., Ltd, commonly known as Sound Machinery, is a Chinese company specializing in the design, development, and manufacturing of plastic injection molding machines. The company was founded in 2009 and is headquartered in Taizhou, Zhejiang Province, China

Commonly known as Haitian, is one of the largest and most prominent injection molding machine manufacturers in the world. The company was established in 1966 and is headquartered in Ningbo, China. Haitian has a strong global presence, with production facilities and sales offices located in more than 130 countries.

Haitian is recognized for its cost-effective injection molding services. They leverage their efficient production processes and economies of scale to offer competitive pricing without compromising on product quality or customer satisfaction.

(6) If the barrel temperature is too low, the injection pressure is insufficient or the injection time is too short, the under injection will also be caused. The control quantity of relevant process parameters should be increased accordingly.

Injection molding is a widely utilized manufacturing process for the production of plastic components. China has become a global hub for injection molding, with numerous companies offering cost-effective services without compromising on quality. In this blog, we will explore the top 10 Chinese injection molding companies that provide affordable solutions, ensuring competitive pricing while maintaining reliable and high-quality services.