Key Steps in Setting Conditions for Injection Molding

1. Set the sol temperature

Sol temperature is one of the important parameters of forming conditions. If the sol temperature is too low, the plastic cannot be completely melted or is too sticky to flow; if the sol temperature is too high, the plastic may be cracked.

2. Set the mold temperature

The main benefit of setting the mold temperature is to maintain the stability of product size and appearance during the manufacturing process.

3. Set the conversion position

The conversion position is the screw position when the filling phase turns into the holding phase, and the buffer amount is the distance between the farthest position the screw can reach and the conversion position.

4. Set the screw speed

Set the required screw speed to plasticize the resin. Be careful not to increase the cycle time due to the plasticizing process.

5. Set back pressure

A back pressure value that is too low will cause uneven melting of the plastic and produce problems such as material splashes.

6. Set the injection pressure

The injection pressure is the sol pressure at the front end of the screw. Ideal injection molding should use the lowest acceptable injection pressure to reduce the internal stress of the plastic part.

7. Set the holding pressure

The screw stops moving when it reaches the conversion position to avoid damage to the mold or the clamping mechanism.

8. Set the injection speed

The highest possible injection speed is used to obtain lower flow resistance, facilitate the molten glue to flow over a longer length, and improve the strength of the seam line.

9. Set the holding time

The purpose of setting the holding time is to ensure that the plastic parts are full and there is no surface shrinkage.

10. Set a cooldown time

The cooling time includes the holding time and the remaining cooling time, so that the parts can be completely cooled in the mold cavity before being ejected from the mold.

11. Set the mold opening time

The mold opening time is usually set to 2.5 seconds. This is the time to open the mold, mold the part, and close the mold. The cycle time is the sum of the filling time, cooling time, and mold opening time.

12. Switch to automatic operation

The purpose of automatic operation is to achieve process stability.

13. Set ejection stroke, starting position and speed

First, withdraw all the sliders. Make sure the product is taken away and does not fall to the ground.

14. Set the mold opening stroke

The distance of the mold opening stroke is the safe distance between the height of the plastic part and the front and rear molds, and at the same time, the production cycle of the product can be appropriately shortened.

15. Minimize holding time

First set a longer holding time, and then gradually shorten the holding time until a dent appears on the surface of the plastic part.

16. Minimize remaining cooldown time

Shorten the remaining cooling time until the maximum temperature of the plastic part surface reaches the thermal deformation temperature of the material.

Each step is designed to optimize production efficiency and product quality, ensuring the stability and consistency of the injection molding process.