Product Plastic

Custom Injection Molded Other product plastic Manufacturing

product plastic:

Process:
1. If the melt temperature is too high, sink marks are likely to appear at the wall thickness, ribs or the back of the protrusions, because the easy-to-cool parts solidify first, and the material will flow toward the hard-to-cool parts; therefore, try to control the sink marks to a minimum. A position that affects product quality. If the sink mark of the product is reduced by reducing the melt temperature, it will inevitably increase the injection pressure;
2. If the injection time is too short or the pressure holding time is too short, when the gate is not solidified, the pressure holding is over;
3. The injection pressure or holding pressure is too low;
4. The injection speed is too fast;
5. Insufficient plastic injection volume and insufficient feeding.
solution:
1. Replace the raw material with smaller shrinkage;
2. Increase the injection pressure and holding pressure;
3. Increasing the injection speed can more conveniently fill the product and eliminate most of the shrinkage;
4. Reduce the melt temperature and mold temperature. Under the same cavity pressure, usually the higher the temperature, the greater the shrinkage. The greater the holding pressure and injection pressure, the smaller the shrinkage. Under the same cavity pressure, the longer the filling and holding time, the smaller the shrinkage. For thin-walled products, the mold temperature should be increased to ensure smooth material flow; for thick-walled products, the mold temperature should be reduced to accelerate the curing and shaping of the skin;
5. Adjust the injection volume and speed pressure switching position;
6. Increase the injection and pressure holding time, prolong the cooling residence time of the product in the mold, maintain a uniform production cycle, increase the back pressure, and retain a certain cushion at the front of the screw, etc., which are beneficial to reduce shrinkage;
7. Adjust and optimize the holding pressure curve.
Since sink marks generally occur in the holding pressure stage, the most effective way to reduce and eliminate sink marks is to correctly control the holding pressure and holding time. The wall thickness of the product is uneven, and the flow resistance of thick-walled and thin-walled melts is different. During the pressing process, it may lead to over-holding pressure for thick walls and insufficient feeding for thin walls, so the wall thickness of the product should be as uniform as possible.
3.5. Weld marks
Also known as weld lines and weld seams, weld lines not only affect the appearance quality of plastic parts, but also affect the mechanical properties of plastic parts such as impact strength, tensile strength, elongation at break, etc. to varying degrees.
Reasons for formation:
Material:
The fluidity of the material is not good, the melt front flows slower and colder, and when the weld line is formed, the temperature of the melt front has dropped very low, resulting in poor bonding, and obvious weld marks will be produced at this time.

FAQ:

Q1. How soon can I get a precise quotation for custom plastic injection part?
A1: Please send us your inquiry by email or Alibaba TM message. Once we confirm the design (Feature details with parameters), material, color, qty, we can provide quotation within 24 HOURS.

Q2: Can I get a free sample, how long will it take?
A2: a. For standard products we have in stock, YES for free sample, but the express fee will be charged in advance.
Mostly, it takes 3-10 days.
b. For custom products, sample fee is determined by the detailed sample requirements. Normally, it takes 7-15 days.

Q3: Can you make custom parts based on my sample?
A3: Yes, you can send the sample to us by express and we will evaluate the sample, scan the features and draft 3D drawing for production.

Q4: What does your OEM service include?
A4: We follow up your request from the design idea to the mass production.
a. You can provide 3D drawing to us, then our engineers and production teams evaluate the design and quote you the precise cost.
b. If you don’t have 3D drawing, you can provide 2D drawing or draft with features details with full dimensions, we can draft 3D drawing for you with fair charge.
c. You can also customize Logo on the product surface, package, color box or carton.
d. We also provide assembly service for the OEM parts.

Q5. What is your payment term?
A5: We accept T/T, Paypal, Western Union, L/C, Alibaba Trade Assurance.

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