1. When theinjection molding machine is just started, the product runs at the front, and the reason and solution of the injection molding parts lack of glue after a period of production.
When the injection molding machine is just started, due to the long heating time, low viscosity and good fluidity of the melt glue in the material pipe, the product is easy to run around. After a period of production, the heat is constantly taken away by the melt glue, resulting in insufficient melt glue, high viscosity and poor fluidity, which makes the product lack of glue. After a period of production, gradually increase the temperature of the material pipe to solve the problem.
2. In the production process, when the product is short of glue, sometimes increasing the glue injection pressure and speed is invalid. Why? resolvent?
The reason is that the melt glue constantly takes away the heat in the production, resulting in the lack of melt glue, high viscosity and poor fluidity, resulting in the lack of glue in the product. Raise the temperature of material pipe to solve the problem.
3. Causes and solutions of product ellipse.
The product ellipse is caused by uneven glue injection, which causes uneven pressure around the product and makes the product ellipse. Three points of glue injection are used to make the product even.
4. Requirements of precision products on mould.
It is required that the die material has good rigidity, small elastic deformation and small thermal expansion coefficient.
5. Purpose of acid resistance test
The purpose of acid resistance test is to detect the internal stress of the product and the position of the internal stress point, so as to eliminate the internal stress of the product.
6. The reason and solution of metal insert cracking easily under stress.
When the insert is placed in the product, because the hot melt adhesive meets the cold insert, the internal stress will be formed, which makes the product strength drop and easy to crack. During production, the inserts are preheated.
7. Rationality and selection method of die exhaust point.
The unreasonable exhaust point of the mould can not achieve the exhaust effect, but will cause product deformation or dimensional change, so the exhaust point of the mould should be reasonable. Select the mold exhaust point, should be in the product last go full of rubber and product trapped gas burning place open exhaust.
8. Causes and solutions of product embrittlement.
The product is easy to crack, which is caused by too many materials and secondary materials used in the product, or the material stays in the material pipe for too long, resulting in the aging of the rubber material, so that the product is easy to crack. Increase the proportion of new materials and reduce the number of times that the nozzle materials are recycled, generally not more than three times, to avoid the rubber materials staying in the material pipe for a long time.
9. Causes and solutions of fiberglass products prone to PAN fiber
It is due to the low temperature of melt glue or mold, and the insufficient injection pressure, which causes the glass fiber can not be well combined with the plastic in the glue, so that the fiber overflows. Increase melt temperature, mold temperature and injection pressure.
10. Effect of feed port temperature on the product.
Too high or too low temperature at the feed inlet will cause unstable material return of the machine and unstable feeding quantity, which will affect the size and appearance of the product.
11. Reasons and solutions for white spots in transparent products.
The white spots of transparent products are caused by the cold glue in the products or the dust in the materials. Raise the temperature of the nozzle, add the cooling well, and keep the raw materials to prevent dust from entering.
12. What is the injection capability of the injection molding machine?
Injection capacity ※※ = injection pressure (kg / cm2) × injection volume (cm3) / 1000
13. What is the injection horsepower of injection molding machine?
Injection horsepower PW (kw) = injection pressure (kg / cm2) × injection rate (cm3 / sec) × 9.8 × 100%
When the machine is just started, the product runs fast. After a period of production, the reasons and solutions for the lack of glue in the product.
When the injection molding machine is just started, due to the long heating time, low viscosity and good fluidity of the melt glue in the material pipe, the product is easy to run around. After a period of production, the heat is constantly taken away by the melt glue, resulting in insufficient melt glue, high viscosity and poor fluidity, which makes the product lack of glue. After a period of production, gradually increase the temperature of the material pipe to solve the problem.
14. Spherical surface cracking after screen printing
Because of the stress on the surface of the product, it causes the crack after silk screen printing. Increase the mold temperature, reduce the stress. The stress can be eliminated by annealing
15. Glasses frame and water port are easy to break
The injection pressure and holding pressure are large, and the residual internal stress at the nozzle edge causes the product to break easily. Reduce the injection pressure and holding pressure as much as possible, and properly increase the mold temperature to solve the problem
16. The shell of electric appliance, four assembly columns, burst when screwing
Because of the water line in the column, the assembly column of the product is easy to crack. Increase the exhaust of the mold, properly increase the mold temperature, and speed up the injection speed to reduce the water line
17. Product deformation
The product deformation is mainly caused by the imbalance of heat shrinkage, or by the internal stress of the product itself
18. Bubble problem in transparent PC shell.
The raw material is not dry enough, the product has uneven rubber thickness, poor mold exhaust, and the raw material is easy to decompose, which may cause product bubbles
Fully dry the raw materials, increase the mold exhaust, and minimize the uneven thickness of the rubber
19. The problem of plastic and beer making of magnetic materials.
High mold temperature and rapid glue injection should be adopted
20. The product is covered with glue and the water port edge shrinks.
Mold exhaust bad, injection speed is slow, pressure and time is not enough, can cause water shrinkage.
Increase the die exhaust, increase the injection speed, increase the holding pressure and time
21. The internal stress of the product causes the product to burst after being placed for a period of time.
Due to the residual stress in the product, the product bursts due to the effect of stress after a period of time
Increase the mold temperature and reduce the injection pressure to eliminate the product stress
