Advantages of UHMWPE molding production process

1. The loss of raw materials is small and will not cause excessive loss (usually 2% to 5% of the quality of the product).

2. The internal stress of the product is very low, and the warping deformation is also very small, and the mechanical properties are more stable.

3. The wear of the mold cavity is very small, and the maintenance cost of the mold is low.

4. The cost of molding equipment is low, the mold structure is simple, and the manufacturing cost is usually lower than that of injection mold or transfer molding mold.

5. It can be formed into larger flat-shaped products. The size of the product that can be molded is determined only by the clamping force of the existing mold press and the size of the template.

6. The shrinkage rate of the product is small and the repeatability is good.

7. A mold with a larger number of cavities can be placed on a given template, with high productivity.

8. It can adapt to automatic feeding and automatic removal of products.

9. High production efficiency, easy to achieve professional and automated production.

10. High dimensional accuracy and good repeatability.

11. Smooth surface, no secondary modification, can be formed once the structure of complex products, mass production, relatively low price.

UHMWPE parts processing technology

1. Sintering molding process

Selection of powder resin, molecular weight is not limited; The powder resin is pressed into various shapes of billets (such as rods, plates, wheels, sleeves, etc.), the pressure is 42MPa, the pressure holding time is 30~90 seconds, and the thermal expansion and cold contraction rate of the mold is 1~3%; Then it is sintered at 250~300¡æ, and the sintering time is determined to be 1 hour /10mino according to the thickness of the product

2. Extrusion molding process

UHMWPE resin should be mixed with LDPE, LCP or additives to improve fluidity. The equipment uses plunger type or twin screw extruder in the same direction to avoid the shortcomings of low friction coefficient and easy slipping of materials. Extrusion temperature 180~200¡æ, screw speed 10~ 15R /min; The single screw extruder can also be used for products with simple shapes, but it is necessary to increase the processing auxiliary equipment and increase the motor power.

3. Injection molding process

UHMWPE resin blended with LDPE, LCP or additives should also be selected; The screw and die of the injection molding machine need to be improved. Injection pressure above 12OMPa, screw speed 40~60r/min, cylinder temperature 180~220¡æ, mold temperature 85~110¡æ.

4. Extrusion molding

The molten billet is first extruded and then added to the mold to make the desired product.

Guangzhou OTEM Engineering Plastics Co., Ltd. is a UHMWPE parts customized production and manufacturing experience in Guangzhou injection molding factory, with more than 2,000 square meters of physical processing factory, but also has CNC, vulcanization machine, spark machine and other professional production equipment, has a strong strength in the field of Guangzhou mold customization. In addition, we have a professional design team to bring customers satisfactory products and services.

UHMWPE modification methods

1. Lubricant modification

Adding lubricant to UHMWPE can improve its processing performance, but the amount should not be too much, otherwise the performance of UHMWPE will be greatly reduced.

2. Liquid crystal polymer in-situ composite technology

After adding suitable ratio of LCP and special auxiliary agent into UHMWPE, and mixing evenly, granulation can be carried out smoothly by using universal single screw extruder.

3. Other modifications

Filling modification of UHMWPE with different fillers can achieve the effects of increasing hardness, increasing flame retardant, improving heat resistance, reducing shrinkage and wear resistance, reducing friction factor and reducing cost. The filler is generally treated with silane, and the amount should not exceed 20%. In addition, using intercalation technique to modify UHMWPE with layered inorganic nanomaterials can achieve many modification effects such as enhancement. UHMWPE can also be modified by grafting, such as solid phase grafting, solution grafting, suspension grafting, etc., to solve the interface compatibility problem.

UHMWPE parts customization applications

1. Bearing

UHMW can be used to manufacture plain bearings, such as rolling bearings, plain bearings, etc. Its low friction coefficient and wear resistance can reduce friction losses and increase bearing life.

2. Guide parts

UHMWPE is mainly used for manufacturing guide parts, such as guide wheels, guide plates, etc. Its wear and corrosion resistance maintain the accuracy and stability of the guide.

3. Guide Rails

UHMWPE can be used to manufacture guides, such as linear guides, slide rails, etc. Its low friction coefficient can reduce the motion resistance and improve the motion stability of the guide rail.

4. Gears

UHMWPE can be used to manufacture gears, such as reduction gears, transmission gears, etc. Its wear resistance and low coefficient of friction reduce wear and energy loss between gears.

5. Seals

UHMWPE can be used to manufacture seals, such as seals, gaskets, etc. Its corrosion resistance can maintain the sealing performance and life of the seal.