Nine steps need to do before starting mold debugging

The quality of the mold is inseparable from the preparation of the extrusion die equipment. In order to ensure the quality of the mold, the mold must be carefully debugged before the start of production. The operator must be familiar with the extruder he is operating. The characteristics of the screw, the control of heating and cooling, the characteristics of the instrument, the control of the tractor, the structure and assembly of the mold, etc., in order to correctly grasp the extrusion process conditions and operate the machine correctly. So, what are the debugging steps?

Step One

Before starting the machine, check whether the temperature control is sensitive, whether the meter is malfunctioning, and whether the cooling water channel is unblocked. It is usually detected by a thermometer or a cooling water.

Step Two

According to the extruder operating procedure, the screw, barrel and die of the extruder are heated. After the temperature rises to the set temperature, it must be kept for another 10 minutes to start up, so that the temperature of each part of the machine tends to be stable.

Step Three

Be sure to heat the joint screws and bolts of the die before starting the machine. The operator must not stand in front of the die before the material is extruded, to prevent the bolt or screw from breaking and causing injury.

Step Four

When starting to extrude, the screw speed should be slow and then gradually speed up to prevent overload and damage to the machine at startup.

Step Five

When starting up, first add a small amount of material, and keep the feeding balance. Pay attention to various values such as torque when feeding. After the material is extruded from the die and pulled on the traction equipment, the material can be gradually increased until normal extrusion.

Step Six

When starting to pull, the sizing die should have a certain distance from the die to facilitate traction. The waterway is opened, the shape of the complex cavity is small, and the multi-cavity profile needs to open the cover of the mold; after confirming that the plasticization of the extruded material is normal, the material is drawn to the tractor through the set traction rope.

Step Seven

If it is found that the parison is not formed at the inlet end of the sizing die or the inner rib is adhered to the inner cavity surface of the profile, a pointed tool can be used to poke a small hole at the non-formed portion or the inner rib portion of the parison at the inlet end of the first sizing die. The small cavity is connected to the atmosphere, and the parison is open when it is set into a mold, which is convenient for forming a negative pressure, and the parison is closely attached to the mold wall of the sizing die.

Step Eight

In the case of blocking the mold (not blocked), the setting table should be moved backwards or the traction speed should be increased immediately, or the above two schemes should be implemented at the same time, and then the process adjustment can be used to resume normal production. If the implementation of the above scheme is invalid, the setting table should be moved back immediately, and the material should be cut along the shaping die, the water vapor of the shaping die should be closed, the traction speed can be reduced, and the profile can be slowly pulled out from the shaping die.

Step Nine

When shutting down, it is generally necessary to first add the stop material to exhaust the production materials in the machine, then stop and heat the disassembly die for cleaning.

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