Liquid Silicone Injection Molding
Liquid silicone injection molded products fully comply with EU environmental standards, ensuring the environmental friendliness of the products and the safety of users, providing important support and guarantee for the manufacturing of medical products.
Injection Molding Suppliers|Production Process
Injection molding suppliers have always been committed to the development of molds and the production of products. Through continuous learning and practice, they can provide strong design and professional operation services. We can determine product positioning based on market demand, technology, funding, and equipment, and provide innovative, high-quality, and efficient services to meet the high demand of customers for molds. Mold is a production tool widely used in the industrial field. It can process metal or non-metallic materials into the desired products based on predetermined shapes and parameters.
Types of Molds
Molds are tools used by plastic injection molding suppliers in industrial production for blow molding, injection molding, extrusion, or stamping. Mold is a precision machining tool with complex shapes and high design difficulty. It has high requirements for structural strength, stiffness, surface hardness, surface roughness, and machining accuracy. With the development of industry, molds are also constantly developing and have higher accuracy, and their types are becoming more diverse.
Classified by Material
Molds are classified by material, mainly including metal molds and non-metal molds. Metal molds mainly include stamping molds, extrusion molds, forging molds, die-casting molds, etc. The main materials are cast iron, steel, or alloys, which have high strength and hardness; Nonmetallic molds mainly include plastic molds, inorganic non-metallic molds, paraffin molds, silicone molds, and sand molds. Plastic molds are also constantly developing with the development of polymer materials.
Classified by Purpose
Plastic Molds: mainly used for the molding of plastic products.
Rubber Mold: mainly used for the of liquid silicone injection molding.
Stamping Molds: mainly used for the processing of metal sheet parts.
Die Casting Mold: The main purpose is to cast metal products into shape.
Others: such as glass mold, ceramic mold, and foam mold, are special molds for specific purposes.
Classified by Molding Method
Hollow Forming Mold: Its main principle is to compress air, put softened thermoplastic into the mold while it is hot, blow and deform it, cool it, and then shape and demold it, becoming a hollow container. The advantage of this molding method is that the bottom is seamless and has good aesthetics, so the application of hollow blow molding molds is the most widespread. There are many plastics suitable for hollow molding, such as polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), polystyrene (PS), etc. Hollow-forming molds are further divided into injection stretch-forming molds and extrusion blow molding molds, with their main difference being the wall thickness of the blank.
Injection Molding Mold: Compared to hollow molding molds, this type of mold requires plastic to be added to the injection machine first, so it causes less friction to the mold. The main process of injection mold operation is injection, pressure holding, cooling, mold opening, extrusion, and trimming. Compared to hollow molding, injection molding has a shorter production cycle, which means it has better economic benefits.
Compression Molding Mold: Compression molding is one of the earliest molding processes used. It is a molding method that directly puts solid plastic into the mold cavity for heating, and then cools and shapes it. This molding method is different from hollow blow molding, as it mainly uses thermosetting plastics.
Extrusion Molding Mold: Plastic that is in a molten state is first subjected to pressure at high temperatures through a die with a specific cross-sectional shape, and then shaped into a continuous profile with the desired cross-sectional shape at lower temperatures. The main process of extrusion molding is the preparation of molding materials – extrusion – cooling – cutting – trimming. In this molding method, the most important parameters to pay attention to are temperature, pressure, and speed to avoid surface cracking, warping, and deformation of the molded parts.
Pressure Injection Molding Mold: The method of forming this mold, also known as transfer molding, involves adding plastic raw materials into a preheated feeding chamber, locking the mold, and applying pressure to the plastic through a pressure column. The plastic melts under high temperature and pressure, turns into a flowing state, and enters the mold cavity through the pouring system to gradually solidify into a plastic part. This method is also commonly used for thermosetting plastics.
Selection of Mold Materials
Injection molding suppliers generally choose to use plastic for production. With the development of society, plastic has replaced non-ferrous metals and occupies an increasingly high position in daily life. Therefore, injection molding suppliers must manufacture corresponding molds for plastic production. At the same time, plastic has its unique advantages but also some degree of defects.
- High Processing Efficiency: Plastic materials can be formed in a mold in one go, with fewer steps used and less processing time. The possibility of requiring secondary processing is low, and the production speed is fast.
- Excellent Chemical Properties: Plastic materials have good corrosion resistance and will not rust or corrode like metals.
- High Safety Performance: Plastic has good strength and elasticity, and it has excellent toughness. If plastic products are used in cars and are subjected to strong impacts, they will have a good buffering effect, protecting the safety of car drivers and users.
- High Comfort: If plastic products are used in cars, they provide users with good comfort due to their shock absorption and sound insulation effects.
- Lightweight: Plastic has a lower density and a lighter weight. The advantage of plastic makes it stand out in the fields of medicine and aerospace.
- Easy to Process: Plastic has excellent plasticity and can be processed into various models and sizes of products.
- Low Cost: Compared to precious metals and silicone, the cost of plastic is relatively low. Waste generated promptly during the production process can also be reused, which helps to reduce costs.
- Poor Stability: Plastic is prone to deformation in extreme weather conditions (such as high temperatures), which affects its dimensional accuracy.
- Easy to Age: Plastic products are prone to brittle aging and loss of performance after prolonged use.
- Pollution of the Environment: Plastic is not easily degradable, and excessive use can easily cause white pollution to the environment.
Maintenance of Molds
Injection molding suppliers should strictly follow the usage precautions and regularly maintain the components of the molds to increase their service life during the use of the molds.
-Daily Use:
Injection molding suppliers need to be proficient in the precautions for daily use of molds, to avoid improper operation that may cause mold damage and increase maintenance costs.
-Regular Inspection of the Lubrication System:
The various components of the mold need to be lubricated during operation to reduce wear, reduce friction, and ensure the normal operation of the equipment. Therefore, it is very important to regularly check whether the lubrication system of the mold is normal, whether the lubricating oil is sufficient, and whether the lubrication points are blocked. Timely addition of lubricating oil, cleaning of lubrication points, and maintaining smooth lubrication systems can effectively improve the efficiency and stability of mold equipment.
-Inspect and Replace Vulnerable Parts:
Molds generally require long-term operation, which can easily cause wear and damage to damaged parts such as screws and barrel liners. Therefore, it is necessary to regularly check the wear degree of these vulnerable parts and repair or replace them promptly according to their severity to ensure that the equipment can operate normally. In addition, it is necessary to regularly check the looseness of fasteners to ensure the stable connection of various components of the equipment.
-Cleaning the Exterior of The Mold:
During the production process of molds, a large amount of waste and cutting debris will be generated. If not cleaned promptly, they will accumulate on the surface and inside of the equipment, affecting the heat dissipation and normal operation of the equipment. Therefore, it is essential to regularly clean the outside of the mold and keep the equipment clean and tidy. At the same time, it is also necessary to pay attention to cleaning the cooler and cooling water pipes of the mold to ensure that the equipment’s heat dissipation system is unobstructed.
-Regularly Inspect the Electrical System of the Mold:
The electrical system of the mold is one of the key factors for the normal operation of the equipment. Therefore, it is important to regularly check whether the wiring of the electrical system is loose, whether the insulation shell is intact, whether the switch can be used normally, and whether the power supply is stable. Report any problems promptly, carry out repairs and care, ensure the safety and stability of the mold electrical system, and enable it to operate normally.
-Regular Maintenance of Molds:
In addition to the above points, injection molding suppliers should also regularly maintain their molds, such as replacing lubricating oil, cleaning the cooling system, inspecting the transmission system, correcting mechanical parts, etc. Of course, before replacing the lubricating oil, it is necessary to check whether the oil to be replaced has quality problems and whether there are impurities mixed in. Although these tasks are meticulous and tedious, they can effectively ensure the stable operation of the mold, extend the service life of the equipment, and reduce maintenance costs. Therefore, maintenance of the mold cannot be abandoned for the sake of convenience.
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