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Cracks appeared around the inserts (PC plastic parts) used for testing with glacial acetic acid. how to solve

There are gray black spots near the headWhat plastic cavity is used for pc material: Silver or black traces appear on the surface of the product centered on the gate or a nearby point. If low viscosity (high flow) materials and high forming temperatures are usedWhat plastic cavity is used for pc material, most of the lines are blackWhat plastic cavity is used for pc material, if highly viscous (low-flow) materials are usedWhat plastic cavity is used for pc material, most of the lines are silver-white. Physical reason: This is caused by another type of bubble being squeezed in and compressed.

White spots usually occur in thin-walled productsWhat plastic cavity is used for pc material, the short production and forming cycle results in too low the melt temperature or too high the screw speed. Properly increasing the barrel temperature and screw speed can solve the problem. Problems such as gray and black markings and radial markings can be improved by optimizing mold design and adjusting processing parameters. For example, extend cycle time, increase screw back pressure, and adjust screw speed. Flashing usually occurs when the mold seals are insufficient or the clamping force is insufficient.

The time for soaking the PC/ABS electronic plastic shell in 95% glacial acetic acid depends on the test purpose and product structure, usually between 30 seconds and 5 minutes. Surface stress testing (pre-screening) Completely immerse the product in glacial acetic acid solution at 25 ° C, soak for 30 seconds, take it out, immediately rinse with clean water and observe the surface. The acceptance criterion is to allow slight whitening, but no cracks should appear.

How to solve the problem that products made by injection molding machines shrink?

1. If the rubber inlet is too far away from the wall thicknessWhat plastic cavity is used for pc material, it is recommended to open the glue inlet near the wall thickness area. in actual productionWhat plastic cavity is used for pc materialOther factors: in the actual production processWhat plastic cavity is used for pc material, may also encounter other factors that cause shrinkage, which need to be analyzed and resolved based on specific circumstances. Mingyang Yutong has a professional team, rich experience and confidence in solving problems. It can cope with various challenges and solve the problem of shrinkage of injection molding products for customers.

2. During the molding process of the injection molding machine, if the product encounters a lack of glue, shrinkage or peak problem, it can be solved by adjusting the pressure and injection time of the injection molding machine. Specifically, for the problems of lack of glue and shrinkage, it is necessary to increase the pressure and injection time appropriately to ensure that the material can fully fill the mold and avoid incomplete filling.

3. When the products made by the injection molding machine have shrinkage problems, the stability of the pressure holding link should be first ensured. If the shrinkage problem is mainly caused by the injection molding process and no other factors are involved, then the holding pressure is the key to solving the problem.

4. Solution: Precision parameter compensation Now compare two trial reports, and mark red abnormal values next to the parameters during the fluctuation period. When resetting the temperature, the temperature should be increased step by step according to the characteristics of the melting finger of the raw material. For example, the front section of ABS material can be 5 ° C higher than the set value to compensate for heat conduction loss. Enable the closed-loop feedback system of the injection molding machine to automatically increase the pressure by 5% in the last 5mm filling section. After mold optimization understands the influence of the gate, you can first use mold flow analysis to verify the improvement direction.

5. Positioning the material head on the thick wall can make the melt more evenly distributed and avoid shrinkage caused by uneven wall thickness. In addition, reasonable design of the cross-section ratio of the wall/rib can further reduce shrinkage. Avoid excessive material accumulation, ensure good mold exhaust function, extend cooling time, and help reduce shrinkage defects. To sum up, by comprehensively adjusting processing parameters and design factors, shrinkage can be effectively reduced or eliminated and the quality of injection molding products can be improved.

What mold steel is used to produce pc material

1. Commonly used mold steel materials for the production of PC materials include H13 steel, S136 steel and 2316 steel. Characteristics of H13 steel: H13 steel is a widely used hot work die steel with good toughness and thermal fatigue resistance. It can effectively cope with repeated thermal shocks during PC injection molding and show excellent high temperature resistance. After appropriate heat treatment, H13 steel can achieve high hardness and wear resistance, meeting the requirements of PC materials for mold cavity wear.

2. The maximum life is usually 1 million cycles. To achieve 5 million cycles, first consider the inner mold and mold blank steel, and then plan to make spare parts for the inner mold. The mold steel depends on your plastic properties before you can make a positive choice., but the most basic hardness requirement reaches HRC48 or above.

3. NAK80 plastic mold steel is a nickel-Ni, aluminum Al, and copper-Cu precipitation age-hardened steel. Its main characteristics are excellent high polishing performance, excellent welding performance and applicable hardness. The imported NAK80 has certain anti-rust ability, but it does not have anti-corrosion and acid resistance. If you need to have the properties of various plastic molds, you need to replace the material.

Injection molding PC material Why is there a film on the surface of the mold cavity

1. You want to askWhat plastic cavity is used for pc materialWhat's going on is that there is a white film on the surface of the mold? The zinc content in the electrolyte is too high. Free cyanide is too high. Low temperature and excessive current density.

2. Common defects on the surface of injection molded products include dark spots, differences in gloss or atomized areasWhat plastic cavity is used for pc material, and wrinkled surfaces or called orange peel. These defects usually appear behind sharp corners near the gate or in the area away from the gate. Find out the cause of these flawsWhat plastic cavity is used for pc material, you can start from both aspects of mold and forming process. Dark spots usually appear near the gateWhat plastic cavity is used for pc material, especially when producing high-viscosity, low-flow materials such as PC, PMMA or ABS.

3. When forming thin-walled plastic parts, there are the following common problems: Short shot refers to the quality defect of the plastic part caused by incomplete filling of the mold cavity, that is, the melt has been condensed before the filling is completed. The filling process and cooling process of conventional injection molding are intertwined. When the polymer melt flows, the melt front encounters the relatively low temperature core surface or cavity wall, and a condensation layer forms on its surface.

Can PC compound plus light diffuser be used for injection molding?

Especially when the injection rate is fast, the injection pressure is small, or the mold structure is unreasonable, the melt flows in and out, and the pp crystallizes quickly and slowly, which may easily cause inconsistent crystallinity on the surface of the product and form wavy patterns on the surface of the product. Solutions: ① Change the process conditions. The use of high-pressure and low-speed injection can maintain the stability of the melt flow, thereby preventing the appearance of wavy lines.② Increase the mold temperature.

- Hot pressing/blow molding: It is mostly used for glass lampshades. The glass blank is heated to a softened state and is molded by hot pressing of the mold or compressed air; this process can also be used for some thin-walled plastic lampshades. - Extrusion molding: For diffuser plate-type lampshades, resin raw materials mixed with diffuser are made into plates through an extruder, and then cut into the required size.

Depending on whether your material is ordinary PC material or optical grade PC material, the light transmittance of 1mm and 2mm plates should not be much worse. For example, when I make light diffusers, the light transmittance and haze are generally not guaranteed. Because of the light diffusers and process problems, the light transmittance and haze may not be maintained at the same value.

The appearance is white ultra-fine powder, and the amount added is generally very small. 1-2 kilograms of light diffuser are added to 1 ton of transparent PS. There are generally two types used for PS: the first type, the transparent PS is still transparent after addition, and the whole film shines after metering is input. This kind of domestic POLYMSJ is this type.

This is the end of the introduction of what plastic cavities PC materials use and what products PC plastic is used for. slot machine ph casino,slot ph casino,slot machine casino,slot casino,slot ph,BAY888.com The world's leading slot game platform, providing exciting gaming experience and generic rewards. Join now and start your journey to victory!。