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How to deal with the problem of fusion line?

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Reason analysis: From the perspective of plastics, the melting line is essentially caused by the incomplete melting of two plastic flow fronts.

Solution: To eliminate or reduce the melting line, plastics must have low viscosity, high temperature, sufficient pressure and enough time to melt completely. Usually, in the case of good exhaust, accelerating the filling and feeding speed and increasing the pressure as soon as possible after the combination of two plastic flow fronts will help to solve the melting line problem.


How to solve the problem of surface depression?

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Basic Reasons: From the perspective of plastics, when the plastics are cooled and contracted, insufficient feeding will lead to dents on the external surface or holes in the interior of the products.

Depression occurs in different locations, and the causes and solutions of the defects are also different.

1. When the depression occurs at the final cooling position of the thick-walled product or at a distance from the gate:
Cause analysis: Typical surface depressions or voids at the thick wall and far away from the gate are usually due to the increase of effective viscosity and pressure loss, resulting in insufficient cavity pressure, resulting in insufficient feeding pressure.
Solution: Increase the pressure of feeding and speed up the feeding rate

2. Surface depressions or cavitations occur near the gate
Cause analysis: Depression occurs near gate, usually due to lack of gate freezing.
There are several reasons affecting gate freezing: it may be caused by the decrease of effective vis…

Energetic Industry - precision machining provider

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ENERGETIC Industry, a professional plastic fabrication company and One-stop Semi-finished Plastics & Metals, Plastic Extrusion Profiles manufacturer:
1.Plastic sheet and plastic rod cutting: polythene sheet, HDPE rod, polypropylene sheets, PP Rod, acetal sheet, acetal rod, PTFE sheet, PTFE bar, nylon sheet, nylon rod, Polycarbonate sheet, PC rods, UHMW sheet, UHMW rod, PEEK sheet, PEEK rod, PPS sheet, PPS Rod, 3D print PEI sheet, Bakelite Sheet, 3025 Phenolic Cotton Sheet, FR4 sheets, alternative Durostone Sheet CAS761, Risho similar solder pallet material 2.Metal sheet and metal rod cutting: Titanium sheet, Titanium rod,  Stainless steel sheet, Stainless steel rod 3.Plastic profile: A6/ Nylon 6 profile, PP profile, HDPE profile, UHMWPE profile, POM profile, PC profile, Acrylic/PMMA profile, PTFE profile, PVDF profiles. 4.Custom plastic parts: SMT jig and fixture,  PCB testing fixture,  plastic machining, plastic gear, plastic rollers, plastic wheels, plastic spacers, plastic liner, p…

Analysis of Common Defects in Plastic Products-Size Change

Basic Reasons: From the perspective of plastics, the reasons for the size change are as follows: The change of pressure distribution in U-shaped cavity will cause the change of size. For crystalline plastics, the change of crystallinity due to the change of cooling rate will cause the change of size. After-treatment of U products, changes in ambient temperature and humidity can also cause size changes. Next, the change of pressure distribution in the cavity and the size change are analyzed and discussed. The causes of defects will vary with the size changes. First, defect phenomenon: the overall product size is too small. Cause analysis: the plastic pressure in the cavity is too low. Solution: Increase the feeding pressure to meet the cavity pressure required by qualified products. 2. Defects: Overall product size is too large Cause analysis: the plastic pressure in the cavity is too high. Solution: Reduce the feeding pressure to achieve the cavity pressure required by qualified prod…

FR4 classification

The surface color of FR-4 epoxy glass cloth laminate is as follows: Yellow FR-4, white FR-4, black FR-4, blue FR-4, etc. FR-4 is the base plate used by PCB, and it is a kind of sheet metal. According to the different reinforcing materials, sheets are mainly classified into the following four types: 1) FR-4: Glass Cloth Substrate 2) FR-1, FR-2, etc.: Paper Substrate 3) CEM Series: Composite Substrate 4) FR-4 of special material substrates (ceramics, metal substrates, etc.) is a plate-like laminated product made of epoxy phenolic resin and other materials impregnated with special electronic cloth by hot pressing at high temperature and pressure. Features: It has high mechanical and dielectric properties, good heat and moisture resistance and good machinability. Usage: Used as insulating structural parts in motor and electrical equipment, including various types of switch FPC reinforcing electrical insulation carbon film printed circuit board, computer drilling cushion die fixture (PCB …

Factors that are more susceptible to influence in the production of plastic products

Fillers, also known as fillers and fillers, are solid substances added to the matrix of polymer materials to reduce costs and/or improve some properties of products. The main factors to be considered when choosing fillers are as follows: 1. Low Price The price of filler has a great influence on the cost of plastics. The proportion of polyvinyl chloride plastics with fillers is 2-3 times that without fillers. Therefore, the proportion of polyvinyl chloride plastics with fillers increases rapidly with the increase of the amount of fillers. Therefore, the cost based on weight is not as accurate as that based on volume. In application, the volume cost must be considered. The small proportion of filler is more advantageous to the volume cost. 2. Oil Absorption That is, the ability of fillers to absorb plasticizers. It depends on the fineness of filler and the variety of filler and plasticizer. The cost of plastics increases with the increase of oil absorption. 3. Electrical Performance Th…

Detailed Explanation of Material Characteristics of PTFE Plate

Polytetrafluoroethylene sheet is made of 100% pure polytetrafluoroethylene by moulding, turning, cutting and other processes.

Among the known plastics, it has the best chemical corrosion resistance, no aging, electrical insulation, and very low friction coefficient. It can be used at - 180 ~ + 260 degrees without load.

Characteristic, high temperature resistance - working temperature up to 250 C.

Polytetrafluoroethylene (PTFE) sheet has good mechanical toughness and low temperature resistance, and can maintain 5% elongation even when the temperature drops to - 196 (?)

Polytetrafluoroethylene (PTFE) sheets are corrosion resistant - inert to most chemicals and solvents, strong acid and alkali, water and various organic solvents.

Polytetrafluoroethylene (PTFE) boards are climate-resistant and have the best aging life of plastics. High lubrication - the lowest coefficient of friction in solid materials.

Non-adherence - is the smallest surface tension in solid materials. It does not adhere…