What is the process of low pressure injection molding, and the difference between low pressure injec

Low-pressure injection molding is a new injection molding process between potting and high-pressure injection molding. The low-pressure injection molding process is a molding process method that injects hot melt adhesive material into the mold and cures it quickly (a few seconds to a few minutes) with a very low injection pressure.

Advantages of low-pressure injection molding: low-pressure and low-temperature injection molding, short process cycle, high yield rate. The waterproof sealing performance is very good, the waterproof sealing level can reach IP67 or even higher, and the vibration resistance, solvent resistance, environmental high and low temperature resistance are very good.

Low-voltage injection molding has been very mature in foreign countries, and is in the stage of rapid development in China, with a wide range of applications, such as wire harnesses, connectors, sensors, mobile batteries, PCB boards, antenna coils, switches, etc.

Low-pressure injection molding is generally used to replace multi-step production operations, such as epoxy potting after molding a plastic housing. Compression molding using low-pressure injection molding is usually a single step. When a component is compression-molded using low-pressure injection molding, there is usually no need for additional plastic housing, molding materials, and housing.

Kane Chemistry (KY) collation.

It is to hang leather and cloth parts, etc., the machine lock can not be too big, if it is too large, the hanging piece will be locked, and then the mold can not be large, the injection pressure can also be large, generally rely on the speed to find.

Low-pressure injection molding and high-pressure injection molding are both injection molding methods. The differences between them are as follows:1

Working principle: low-pressure injection molding is to use the change of pressure to achieve the injection of plastic melt, and the working pressure of the file opening method is generally in the range of 100-200 MPa. High-pressure injection molding, on the other hand, uses a hydraulic cylinder to push the plunger to spray molten plastic into the mold, and the working pressure of this method is more than 1000 MPa.

2.Applicable materials: low-pressure injection molding is generally used for thermoplastic materials with low melting points, such as PE, PP, etc.

High-pressure injection molding is suitable for thermoplastic materials with high melting points, such as PC, POM, etc. 3.Product Performance:

The surface quality of the products molded by low-pressure injection is not very good, while the patterns of the products molded by high-pressure injection are clear and beautiful, and the product density and strength are high. 4.Equipment Cost:

Low-pressure injection molding equipment is generally smaller and less costly. The high-pressure injection molding equipment is large in size, equipped with hydraulic pumps, hydraulic systems, air-cooling systems, etc., and the cost is high. In short, when choosing an injection molding method, it is necessary to consider the most suitable production method according to the nature of the product, material characteristics, cost and other factors produced.

Summary. Low-pressure injection molding and high-pressure injection molding are two different plastic molding methods, and they have certain differences in terms of process, equipment, and material application. Here are their main differences:

1.Process: Low Pressure Injection Molding:

Low-pressure injection molding is a process in which plastic is injected into a mold at a lower pressure (usually in the range of 3 to 15MPa) in a molten state and solidified by pressure and cooling. This process is particularly suitable for thin-walled or complex parts with fine structures. High Pressure Injection Molding:

High-pressure injection molding is a process in which plastic raw materials are heated to a molten state, and then quickly filled into the mold cavity at higher pressures (usually in the range of 100 to 200MPa), and molded as the cooling process progresses. 2.Equipment:

The low-pressure injection molding machine is relatively small, easy to operate, and has obvious energy-saving effect; The high-pressure injection molding machine is relatively large, complex in structure, and relatively high in energy consumption. 3.Finished product features:

The surface quality of low-pressure injection molding products is better, and the deformation and stress are low; High-pressure injection molded finished products are produced quickly and efficiently, but can cause high internal stresses and deformations. 4.Scope of application:

Low-pressure injection molding is suitable for products that are susceptible to large top pressures, have complex geometries, relatively shallow walls and require high surface quality. In addition, low-pressure injection molding auxiliary equipment is relatively simple and easy to maintain. High-pressure injection molding is more suitable for the production of a large number of standard plastic parts, with better production efficiency and cost control, covering a wide range of material types.

Low pressure injection molding and high pressure injection molding are two different plastic molding methods, and there are certain differences in process, equipment, material application range, etc. Here are their main differences:1

Process: Low-pressure injection molding: Low-pressure injection molding is a process in which plastic is injected into a mold at a lower pressure (usually in the range of 3 to 15MPa) in a molten state, and solidified by pressure and cooling.

This process is particularly suitable for thin-walled or complex parts with fine structures. High-pressure injection molding: High-pressure injection molding is an old process in which plastic raw materials are heated to a molten state, and then quickly filled into the mold cavity at a higher pressure (usually in the range of 100 to 200MPa), and molded as the cooling process progresses.

2.Equipment: The low-pressure injection molding machine is relatively small, easy to operate, and has obvious energy-saving effect; The high-pressure injection molding machine is relatively large, complex in structure, and relatively high in energy consumption.

3.Characteristics of the finished product: the surface quality of the low-pressure injection molding product is good, and the deformation and stress are low; High-pressure injection molded finished products are produced quickly and efficiently, but can cause high internal stresses and deformations.

4.Scope of application: Low-pressure injection molding is suitable for products that are susceptible to large-scale top pressure, have complex geometric structures, relatively shallow walls and require high surface quality.

In addition, low-pressure injection molding auxiliary equipment is relatively simple and easy to maintain. High-pressure injection molding is more suitable for the production of a large number of standard plastic parts, with better production efficiency and cost control, covering a wide range of material types.

In short, low-pressure injection molding and high-pressure injection molding have their own advantages and disadvantages, and it is necessary to choose the appropriate process according to product characteristics, mold requirements and production goals.

Low-pressure injection molding and high-pressure injection molding are two different plastic injection molding processing technologies. Low-pressure injection molding usually means that in the injection molding process, the working pressure of the injection molding machine is low, generally between 10-20MPa; The high-pressure injection molding corresponds to a greater working pressure, generally between 30-40MPa. The main difference between them is the fluidity of the plastic during the injection molding process, the ashwagandha and the molding effect.

Low-pressure injection molding has the following advantages: the molding speed is fast, suitable for simple shape products, can save mold costs, but the injection volume can not be too large, and the molding quality is difficult to control. High-pressure injection molding can better control the temperature, pressure and other parameters in the injection molding process, making the molding quality more accurate, and suitable for complex shapes and large-scale production products.

However, the disadvantage is that the production cost is relatively high. Therefore, when choosing low-pressure injection molding or high-pressure injection molding, we should decide which injection molding processing technology to use according to the production needs and the characteristics of the product.

Low-pressure material-slip injection molding is made of lower injection pressure molding, and the injection clamping force is generally less than 5t, which we can call low-pressure injection molding. Above 5t, we can call it conventional pressure injection molding or high-pressure injection molding.

The reason why there is a difference between low-pressure injection molding and high-pressure injection molding is that the different products applied determine the different injection molding processes.

The injection temperature of the low-pressure injection molding process is relatively low, generally in the range of 180-240, and the high-pressure injection molding is generally in the range of 230-300, so the high-pressure injection molding can not inject sensitive components, and the low-pressure injection molding is very suitable for replacing the traditional potting as the packaging of electronic components.

Why low-pressure injection molding has advantages:

First of all, low-pressure injection molding is different from the material used in traditional injection molding machines. The viscosity of the hot melt adhesive for low-pressure injection molding is very low, the material has high fluidity after hot melting, and does not need to be extruded through the screw, as long as it is heated and melted by the rubber cylinder and injected through the gear pump, it can be made to flow into the mold with little space with very little pressure, and then cooled and molded. Therefore, the low-pressure injection molding machine does not have a screw device, and the glue is injected through the gear pump and hose and glue gun.

This has a very good protection effect for some fragile components, which greatly improves the work efficiency. <>

The low-pressure molding process has many effects that cannot be achieved by normal injection molding, such as:

The injection molding of automobile interior is the injection molding of leather, canvas and hot melt adhesive together, and direct injection molding will shoot through the leather or canvas, only through the low-pressure injection molding process, secondary molding.

Another example is the ultra-thick product injection molding at one time, the product is easy to shrink, or the internal stress is huge, and it bursts in the later stage, so it must be molded by low-pressure injection.

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The injection molding process refers to the process of making a certain shape of semi-finished parts by pressurizing, injecting, cooling, and disconnecting the molten low-pressure injection molding material raw materials.

The low-pressure injection molding process is a packaging process that uses very low injection pressure (the hot-melt low-pressure injection material is injected into the mold and quickly cured, and the excellent sealing and excellent physical and chemical properties of the hot-melt low-pressure injection molding material can achieve insulation, temperature resistance, impact resistance, vibration damping, moisture-proof, waterproof, dustproof, chemical corrosion resistance, etc., and play a good role in protecting electronic components.

Low-pressure injection molding process characteristics:

1. Lower pressure, as low as the injection pressure, ensures that the electronic components are not damaged by stress, and greatly reduces the scrap rate;

2. Lower temperature, the injection temperature is as low as 150 degrees Celsius, even the PCB soft board can be easily wrapped, protecting fragile electronic components and avoiding unnecessary waste.

3. Faster molding, the process cycle of low-pressure hot melt adhesive injection molding can be reduced to as little as 5 seconds, which greatly promotes the production efficiency.

4. Higher efficiency, choosing low-pressure injection molding process can not only greatly improve production efficiency, but also reduce the defective rate of finished products, and help manufacturers establish cost advantages in general.

5. The mold is simple, and the low-pressure forming mold can be cast aluminum mold instead of steel, so it is very easy to design, develop and process the mold, which can greatly shorten the development cycle.