The difference between PC screw and PVC screw of injection molding machine (screw of injection molding PC material)

Today, I will share with you the knowledge of the difference between PC screws and PVC screws in injection molding machines. The screws used to inject PC materials will also be explained. If you can happen to solve the problems you are facing now, don't forget to pay attention to this site, let's start now!

List of contents for this article:

• 1、What is the difference between Pc screw and ordinary screw in injection molding machines?
• 2、What are the screws of injection molding machines? What raw materials are suitable?
• 3、Can the special screw for PC material of injection molding machine be used as pvc material?
• 4、What is the biggest difference between universal polyolefin injection molding screws and PVC special screws?
• 5、What are the parts of the injection molding machine screw?
• 6、The difference between pvc screws and ordinary screws

What is the difference between Pc screw and ordinary screw in injection molding machines?

1. There is a significant difference in size between PC screws and ordinary screws. PC screws are usually designed to be smaller, while ordinary screws are relatively larger. This design difference is mainly due to the characteristics of PC materials. PC, or polycarbonate, has excellent transparency, high heat resistance and mechanical strength. In order to better adapt to these characteristics of PC materials, the hardness of PC screws has also been correspondingly improved.

2. Liquidity, characteristics. Mobility. PC screw is a high-viscosity non-crystalline plastic with poor flowability, while pe screw production is difficult to melt and has strong flowability. Characteristics. PC screw is easy to degrade after long-term heating, has large feeding torque, and has medium and small diameters as pe screw, and has good flame retardant ABS.

3. In the field of injection molding machines, the choice of screws is crucial to product quality and production efficiency. Different types of screws are suitable for different raw materials to meet specific processing needs. The PC special screw is suitable for high-viscosity plastics such as PC. It has the characteristics of less shear heat and acid corrosion resistance, and has a moderate diameter. This screw is suitable for forming PC, PP-R, flame retardant ABS and other materials, but it has poor color mixing effect on ordinary PMMA products.

4. Different bearing conditions and different forming characteristics. Bear the difference. pc: High temperature resistance and does not deform at high temperatures. pp: Good chemical resistance. Different forming characteristics. pc: High-viscosity amorphous plastic, high feeding torque and difficult to melt. pp: Crystalline material has low hygroscopicity and is prone to melt rupture.

What are the screws of injection molding machines? What raw materials are suitable?

1. The screws of injection molding machines are mainly divided into the following types, and their applicable raw materials are as follows: Solid screws: Suitable for most general plastics, such as polyethylene, polypropylene, etc. This screw has simple design and is mainly used to convey and plasticize plastics. Its plasticizing ability is weak and is suitable for occasions with low plasticizing requirements. Splitting screw: Suitable for plastics with poor fluidity, such as polyvinyl chloride, polystyrene, etc. The design of the shunt section can increase the residence time of plastic in the screw and improve the plasticizing effect.

2. PC-specific screws are suitable for high-viscosity plastics such as PC. They have the characteristics of less shear heat and acid corrosion resistance, and have a moderate diameter. This screw is suitable for forming PC, PP-R, flame retardant ABS and other materials, but it has poor color mixing effect on ordinary PMMA products. If toner is added to plastic, you need to customize a strengthened color mixing screw. The special screw for PA is designed for PA's low viscosity, difficult coloring, fast melting speed, and good self-lubrication.

3. The screws of injection molding machines are mainly divided into the following types: solid screws, shunt screws, barrier screws, torpedo screws and mixing screws. Solid screws are the most common screw type and are suitable for most general purpose plastics such as polyethylene (PE), polypropylene (PP), etc. This screw has a simple design and is mainly used to convey and plasticize plastics. Its plasticizing ability is weak and is mainly suitable for occasions with low plasticizing requirements.

Can the special screw for PC material of injection molding machine be used as pvc material?

1. You can choose to use corrosion-resistant and wear-resistant high-quality stainless tool steel screws and three small pieces.

2. In short, measures that can improve melt mobility will be beneficial to solving the problems of PVC weld lines and water ripples. In addition, reducing the content of secondary recycled materials and adding a little diffusion oil will also help solve the problem. When you have to, you can consider using a special fine screw injection molding machine for injecting PC material to solve the problem. However, professional injection molding machines for PC materials cannot be used for a long time, because long-term use will cause the loss of the dedicated screw for PC materials, and injection molding production of PC materials can no longer be carried out.

3. Insufficient preheating will cause the plastic to not be completely melted, increase the friction between the screw and the barrel, and accelerate wear. Materials match screws. Corrosive materials (such as PVC, flame retardant materials) and hard materials (such as glass fiber additives) require the use of special screws. Ordinary screws are easily corroded or worn. Special screws improve corrosion resistance and wear resistance through surface treatment (such as nitriding, double alloy spraying), and matching material characteristics can significantly extend life.

4. Single-screw PVC agent extruder is usually used to produce PVC pipes, plates, films and other products. As for whether it can be used to produce PE products, it depends on the production capacity of the equipment and the ability to adjust machine parameters. In general, a twin-screw extruder is required to produce PE products because PE has a low melt index and a high viscosity, and requires higher shear force for better extrusion.

5. PVC soft and hard materials can use the same screw. However, the following points need to be noted: Screw design adaptability: The design of special screws for PVC usually takes into account the characteristics of PVC materials, including its thermal stability, melt viscosity and processing temperature range. Therefore, whether it is soft or hard, as long as they both belong to the category of PVC materials and have similar processing temperatures, pressures and other conditions, the same screw can usually be used.

6. After replacing the antistatic hose, the problem was solved) Check the dehumidifying dryer of raw materials. The regeneration temperature is very high. If the quality of the heating tube is not good, black flakes will easily fall off the outer wall of the heating tube and then fall into the molecular sieve., and then enter the entire system. In this way, the product you make will have black spots. A special screw must be used, because PC material is very corrosive, and black material will come out once the screw is rotten.

What is the biggest difference between universal polyolefin injection molding screws and PVC special screws?

yesThe difference between pc screw and pvc screw in injection molding machineThere are great differences in structure between general polyolefin injection molding screws and special PVC screws. This is because the characteristics of polyolefin and PVC materials are different and require the use of different screw structures for injection molding. Universal polyolefin injection molding screws generally consist of five areasThe difference between pc screw and pvc screw in injection molding machine: feeding area, compression area, mixing area, plasticizing area and metering area. This screw structure has good plasticizing and mixing capabilities for plastics with loose melts such as polyolefins, and can improve the efficiency and quality of injection molding.

PVC screws usually do not have check rings, and the head taper is large, usually between 20° and 30°. The surface of PVC screws is usually chrome plated to enhance corrosion resistance. Differences in screw parameters: Parameters of PVC screw may include length-diameter ratio (L/D), helix angle (h3), screw diameter (De), etc. General parameter ranges may be L/D=16~20, h3=0.07De=6~2, L1= 40% L, L2= 40% L.

Materials, shapes. Materials are different. PVC is made of polyvinyl chloride and is corrosion resistant. PP is a polycarbonate material with high impact resistance and high hardness. Appearance. The surface of PVC screws must be chrome plated, without rubber rings and glue separation mesons, but pp screws must not be used.

There is a significant difference in size between PC screws and ordinary screws. PC screws are usually designed to be smaller, while ordinary screws are relatively larger. This design difference is mainly due to the characteristics of PC materials. PC, or polycarbonate, has excellent transparency, high heat resistance and mechanical strength. In order to better adapt to these characteristics of PC materials, the hardness of PC screws has also been correspondingly improved.

The use ratio of seven-color deer masterbatch can be selected according to 1:100, unless the mixing of the equipment is very good, otherwise it is easy to appear uneven pigment dispersion. Masterbatch is a kind of special granules for coloring plastic products, which can be divided into polyolefin, PE, PS and ABS according to the types of colored plastics.

What are the parts of the injection molding machine screw?

1. Generally, the screw is divided into three sections: the feeding section, the compression section, and the homogenization section (also called the metering section).

2. The components of the screw of the injection molding machine usually include the screw, check ring gasket, check ring and screw head. The screw is mainly divided into three sections: the feeding section, the compression section and the homogenization section, also known as the metering section. The feeding section is the first part where plastic enters the screw, and the rotation of the screw helps mix the material with color masterbatches or additives. The compression section follows closely, where the thread depth of the screw gradually changes, creating shear force during rotation, causing the plastic to melt and plasticize.

3. The screw of the injection molding machine is generally divided into three parts: the feeding section, the compression section and the homogenization section. The feeding section is mainly responsible for transporting raw materials, and its bottom diameter is small. The parameters include L1 and h1, where the value of h1 ranges from 0.12D to 0.14D. The compression section is a key part of the screw. The bottom diameter will change. The main function is to consolidate and melt the material while establishing pressure. Parameters for this section include compression ratio ε, L2 and gradient A.

4. The components of the screw of the injection molding machine are generally divided into: screw + check ring gasket + check ring + screw head; generally, the screw is divided into three sections: feeding section, compression section, and homogenization section (also called metering section). The screw of an injection molding machine can generally be divided into three sections: blanking section: This is the first section where plastic enters the screw. The rotation of the screw also serves to stir in advance, allowing the material and color master or other additives to mix evenly.

5. The three-piece screw set replaced by the injection molding machine is a screw, a barrel and a rubber head (check ring). Screw: As the core transmission component of the injection molding machine, the screw completes the functions of transporting, plasticizing and compacting plastic particles through rotating action. The shearing heat generated by its special thread structure, combined with external heating, fully melts the plastic, which directly affects the plasticizing efficiency and material uniformity of injection molding.

The difference between pvc screws and ordinary screws

Material differences: PVC is a heat-sensitive plastic, which can be divided into two types: hard and soft. Hard PVC usually contains less than 10% plasticizer, while soft PVC contains more than 30% plasticizer. Differences in screw design: The design of PVC screws needs to take into account these characteristics of the material, such as strict temperature control, and the shear force should be minimized when designing the screws to prevent overheating.

Materials, shapes. Materials are different. PVC is made of polyvinyl chloride and is corrosion resistant. PP is a polycarbonate material with high impact resistance and high hardness. Appearance. The surface of PVC screws must be chrome plated, without rubber rings and glue separation mesons, but pp screws must not be used.

PVC materials release hydrogen chloride gas during processing, so special PVC screws need to have exhaust capabilities. In addition, PVC materials are also difficult to plasticize, so PVC special screws also need to have a longer plasticizing area and more detailed temperature control capabilities. Therefore, although universal polyolefin injection molding screws and PVC-specific screws may be similar in appearance, their internal structures and designs are different based on the characteristics and processing requirements of different materials.

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