Plastic Injection Molding
The application of plastic injection molding products is very extensive, and almost all industries that use plastic involve this process, such as the production of various daily necessities, electronic product casings, automotive parts, etc.
Plastic Injection Company：Manufacturing of Molds
Plastic injection company mainly provides services for designing and developing various injection molding, blow molding, and stamping molds, as well as improving maintenance and upkeep services for molds and equipment. The plastic injection company has introduced a large number of advanced domestic and foreign technologies and design experience and has a large number of professional technical personnel, designers, and various precision instruments. At the same time, manufacturers have rich production and practical experience and can manufacture products with extremely high quality to meet various customer needs, which has been recognized by many customers and has accumulated a certain reputation in the precision manufacturing industry.
Plastic injection molding is mainly the process of pouring various forms of plastic raw materials into the material barrel, melting, and plasticizing them after temperature rise. The screw of the injection molding machine drives the plastic at high speed, passes through the nozzle, and quickly injects it into the mold. It cools and solidifies under high pressure to maintain the shape of the mold cavity, thereby demolding and forming plastic parts.
The Reason Why the Company Chooses Plastic Injection Molding
The reason why a company chooses plastic injection molding is largely due to its outstanding advantages. Injection molding is a very powerful technology and an essential part of modern industry. With the advancement of materials and the evolution of manufacturing technology, it still adapts to market demands.
- High Efficiency and Fast Production Speed: Plastic injection molding is a cyclic process that can achieve high automation, with fast production speed and reduced uncertainty in manual production.
- Strong Adaptability: Injection molding can not only produce simple bottles and cans but also relatively complex products. Production using injection molding has strong adaptability.
- Accurate Size: Injection molding can achieve precise product dimensions, ensuring product quality. Including products with complex shapes, they can also meet production needs very well.
- Can Achieve Mass Production: Injection molding can be used in the production of large quantities of complex products, which can accelerate production speed and efficiency.
- Environmental Friendliness: The plastic materials used in injection molding can be recycled and reused, greatly avoiding environmental pollution.
- High Flexibility: Even if there is only one set of injection molds, different products can be made by changing the color of the raw materials to meet the user’s aesthetic needs.
- Lightweight Production: The plastic raw materials used in injection molding are generally of low density and lightweight, making the products more convenient to use in daily life and easy to carry.
Selection of Plastics During Injection Molding
Before conducting injection molding work, a plastic injection molding company needs to first choose suitable plastic raw materials. Various plastics have their unique characteristics, and the correct choice can bring higher benefits to injection molding manufacturers.
- Classified by Plastic Chemical Structure and Properties after Heating
Plastic raw materials can be divided into thermoplastic and thermosetting plastics based on their chemical structure and properties after heating. Thermoplastic has plasticity after heating and can be processed into various shapes. The shape remains unchanged after curing. Thermoplastic processing has reversibility, that is, the raw material becomes a product and can be reheated for reuse, and then re-cured into a new product. Thermosetting plastics also have plasticity. After heating, they can shape products of various shapes, but they are not reversible. After cooling and forming, they do not change when heated, meaning they undergo both physical and chemical changes during the heating process. Therefore, products produced using thermosetting plastics cannot be recycled. So, during the processing, the heat resistance of thermosetting plastics is still better than that of thermoplastic plastics. When choosing plastic raw materials, the first consideration for companies is their heat resistance.
- Classified by Plastic Properties and Uses
Plastics can be divided into general plastics, engineering plastics, and special plastics according to their uses. Universal plastics usually refer to plastics with high production capacity, low price, and wide applications but low performance, including polyethylene, polypropylene, polyvinyl chloride, ABS, etc., whose production accounts for 60% -80% of all plastic production. Engineering plastics can be used as engineering materials instead of metal materials for processing. Their performance characteristics are quite prominent, such as good impact resistance and heat resistance. They can be used well in chemical environments, such as polyamide, polyphenylene sulfide, polyoxymethylene, and polycarbonate. They can be widely used in fields such as automobiles, electronics, and aerospace. However, the production of engineering plastics is relatively small, which also limits their use. Special plastics are mainly suitable for various special occasions, such as medical plastics, military plastics, and aerospace plastics. These special plastics have excellent performance after special treatment, but their production is relatively small. So companies and manufacturers should consider the use of plastics when choosing.
- Classification by Processing Method
Plastics can be divided into injection plastics, extrusion plastics, laminated plastics, and blow-molded plastics according to their processing methods. Plastics for injection, extrusion, and blow molding are generally similar to thermoplastic plastics, while laminated plastics combine fiber fabrics soaked in resin by hot pressing to form a cohesive material. Therefore, when providing services, manufacturers should consider the plastic processing methods used by customers.
Management Measures for the Injection Molding Process of the Company
Plastic injection molding company usually attaches great importance to the management of injection molding processes to improve production efficiency and the quality of finished products.
- Testing of Products and Molds
The products produced by injection molding must first not only affect the final target customer’s use but also maintain a certain degree of aesthetics. Before providing injection molding services, the company first needs to inspect the produced samples to ensure that they meet the customer’s requirements and prevent subsequent batch rework. The main purpose of checking the sample is to check if it matches the design dimensions of the drawing. If there are colors, check if there are any uneven colors in each part; The appearance should also have no obvious defects, and flash edges, burrs, etc. should be repaired promptly; If products need to be assembled, labeled, and packaged, they should also be checked for adequacy. If the shape of the formed part does not meet the customer’s requirements, the manufacturer needs to consider whether the mold cavity needs to be redesigned.
- Preparation before the Startup
Before starting up the injection molding company, it is necessary to inspect the machine, such as checking whether the power supply of the equipment can be turned on or off normally, whether the cooling and exhaust systems can operate normally, whether the remaining materials in the barrel have been completely cleaned, whether the materials have started to heat evenly, and finally ensure that the safety door is effective and whether the operation safety is guaranteed.
- Injection Molding Process Operation Specifications
When the company starts injection molding, both operators and other relevant personnel should pay attention to operating standards and strictly follow production standards or operation instructions. During the production process, it is also important to maintain the cleanliness and tidiness of the machine to prevent dirt and dirt from the countertop from contaminating the product.
- Preheating of Embedded Parts
Due to the different thermal conductivity and shrinkage properties of plastic and metal inserts, manufacturers usually preheat the insert in advance and increase the thickness of the plastic around the insert, reducing the temperature difference between the plastic and metal inserts, and reducing the possibility of defects such as cracks.
- Selection of Release agent during Injection Molding Process
For some products with complex structures, it is inevitable to encounter difficulties in demolding, and in this case, demolding agents are needed to help with demolding. Manufacturers usually spray release agents on the core of the mold to ensure the smooth release of plastic products.
- Parameter Settings
Manufacturers need to set and adjust parameters such as temperature, speed, and pressure before injection molding production. The temperature of plastic plasticization needs to be maintained within an appropriate range. If it is too high, it will cause plastic to be difficult to shape; If the temperature is too low, it will cause the plastic to melt slower or even unable to melt; The temperature of the mold should be 10-20 degrees Celsius higher than the coolant. The injection speed, also known as the screw speed, should be as slow as possible while maintaining rapid production. Manufacturers should gradually increase the pressure when setting the holding pressure for debugging and select the most suitable pressure. Although material can be saved when the pressure is too low, it may not be able to fully inflate. If the pressure is too high, it can easily lead to an increase in internal stress and warping of the finished product.
The reason why plastic injection molding companies choose to provide plastic injection molding services is mainly due to the superiority of injection molding technology, and their selection of plastic raw materials is also relatively diverse. Manufacturers do not have smooth sailing during the injection molding process and need to strictly control the process to prevent product problems.
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