How to solve the problem of welding marks on the surface of injection molded products

In terms of the causes of weld marks, in order to reduce weld marks, it is necessary to reduce the possibility of the phenomenon of "diverting and converging" of materials during injection or extrusion. In order to reduce and eliminate weld marks on the surface of injection molded products, there are the following methods:

1. Increase the mold temperature;

2. Adjust the injection speed;

3. Comprehensive exhaust;

4. Keep the surface of the mold clean;

5. Adjust the injection pressure and plastic filling pressure;

6. Set the gate position reasonably.

Summary. Hello, glad to answer for you. Injection molding products have welding marks on the surface of the solution:

1. Reduce the number of gates.

2. Adjust the gate position.

3. Add a material overflow well near the fusion part, move the fusion line to the overflow well, and then cut it off.

4. Strengthen the exhaust in the fusion line area and quickly evacuate the air and volatiles in this part. Increase the material temperature and mold temperature, enhance the fluidity of the plastic, and increase the material temperature during fusion.

5. Change the location and number of gates, and move the position of the fusion line to another place.

6. Increase the injection speed.

7. Increase the injection pressure and appropriately increase the size of the gating system.

8. Reduce the use of release agents.

9. Shorten the distance between the gate and the welding area.

10. Adjust the position of the gate so that the plastic melt collides with the pin or wall after passing through the gate.

11. Change the gate form, adopt overlapping gates or lug gates, and set up sufficient stagnant areas in the gate area.

12. It can slow down the initial injection speed of plastic melt.

13. Increase the cross-sectional area of the gate thickness, so that the flow front is formed immediately.

14. Increase the temperature of the mold to prevent the material from curing rapidly.

How to solve the problem of welding marks on the surface of injection molded products

Hello, I have seen your question and am sorting out the answer, please wait for a while Hello, I am happy to answer for you. Welding marks on the surface of injection molded productsSolutions: 1. Reduce the number of gates.

2. Adjust the gate position. 3. Add a material overflow well near the fusion part, move the melting auspicious line to the overflow well, and then cut it off. 4. Strengthen the exhaust in the fusion line area and quickly evacuate the air and volatiles in this part.

Increase the material temperature and mold temperature, enhance the fluidity of the plastic, and increase the material temperature during fusion. 5. Change the location and number of gates, and move the position of the fusion line to another place. 6. Increase the pulse rate of injection velocity residue.

7. Increase the injection pressure and appropriately increase the size of the gating system. 8. Reduce the use of release agents. 9. Shorten the distance between the gate and the welding area.

10. Adjust the position of the gate so that the plastic melt collides with the pin or wall after passing through the gate. 11. Change the gate form, adopt overlapping gates or lug gates, and set up sufficient stagnant areas in the gate area. 12. It can slow down the initial injection speed of plastic melt.

13. Increase the cross-sectional area of the gate thickness, so that the beam hidden flow front is formed immediately. 14. Increase the temperature of the mold to prevent the material from curing rapidly. <>

Summary. Hello, the answer I got for you is: 1. Increasing the melt temperature is conducive to improving the weld marks on the surface of plastic parts.

2. Increasing the injection pressure helps to overcome the resistance of the runner, transmits the pressure to the melt front, makes the melt fuse at high pressure at the weld mark, increases the density of the weld mark, and improves the strength of the weld mark.

3. Increasing the holding pressure can not only provide more kinetic energy for the movement of the molten molecular chain, but also promote the combination of the two melts, thereby improving the density of the weld mark area and the strength of the weld mark.

4. Increasing the injection speed and shortening the injection time will reduce the flow time before the fusion of the melt front, reduce the heat loss, and strengthen the shear heat generation, so that the melt viscosity decreases and the fluidity increases, thereby improving the strength of the weld marks.

5. Reasonable mold structure can reduce the generation of weld marks, improve the strength of weld marks or reduce the impact of weld marks on the overall performance of plastic parts.

The above is the answer I have compiled for you, if my answer is helpful to you, I hope you can evaluate my service, your praise is the driving force for me to move forward, thank you for your support, if you have other questions, you can continue to ask me, I am happy to continue to answer for you, I wish you a happy life!

How to solve the problem of welding marks on the surface of injection molded products

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Dear, hello, the answer to my inquiry for you is: 1. Increasing the melt temperature is conducive to improving the weld marks on the surface of plastic parts. 2. Increasing the injection pressure helps to overcome the resistance of the runner, transmits the pressure to the melt front, makes the melt fuse at high pressure at the weld mark, increases the density of the weld mark, and improves the strength of the weld mark.

3. Increasing the holding pressure can not only provide more kinetic energy for the movement of the molten molecular chain, but also promote the combination of the two melts, thereby improving the density of the weld mark area and the strength of the weld mark. 4. Increasing the injection speed and shortening the injection time will reduce the flow time before the convergence of the front in the melt hall, reduce the heat loss, and strengthen the shear heat generation, so that the melt viscosity decreases and the fluidity increases, thereby improving the strength of the weld mark. 5. Reasonable mold structure can reduce the generation of weld marks, improve the strength of weld marks or reduce the impact of weld marks on the overall performance of plastic parts.

The above is the answer I have compiled for you, if my answer is helpful to you, I hope you can evaluate my service, your praise is the driving force for me to move forward, thank you for your support, if you have other questions, you can also continue to ask me, I am happy to continue to answer for you, I wish you a happy life!

If the surface is sticky glue marks, you can use an eraser to remove most of the stains, and then use a cotton swab to stick a small amount of wind oil essence to the stains, and gently wipe it with a cotton swab after 1 minute to remove the weld marks of plastic products.

After the weld marks of plastic products are removed, wipe them with a damp cloth and air dry.

If there are oil stains or other weld marks on the surface, you can use a toothbrush to stick a small amount of toothpaste and gently brush the stain.

Add vinegar to the water and boil repeatedly for two days before applying it to top.

Causes and improvement measures of injection molding weld marks Fusion weld marks are an important factor affecting the quality of plastic parts. It is found that under the same process conditions, the strength of the weld mark area is only 10-92% of that of the original material, which seriously affects the normal use of injection molded products.

For example, in the automotive industry, unqualified plastic parts directly lead to the decline of automobile quality and even endanger people's lives. Therefore, it is of great practical significance to study the formation process and influencing factors of weld marks and find ways to eliminate weld marks. The formation mechanism of weld marks: The "weld marks" of plastic products refer to the three-dimensional area formed when two strands of molten materials are in contact with each other, and the morphology, structure and mechanical properties are completely different from those of other parts.

There are two basic types of most common weld marks in injection molded parts: one is due to the structural characteristics or large size of plastic parts, in order to reduce the melt process and mold filling time, when two or more gates are used, the melt front that enters the cavity from different gates meets the fusion marks, which is called cold fusion marks.