TROUBLESHOOTING FLASH IN INJECTION MOLDING MACHINE

FLASH IN INJECTION MOLDING PRODUCT

Flash is Nothing but just an extra material over the molded product , Flash causes loss of material at the time of molding and sometimes it also destroys the surface beauty of the product .

MAJOR CAUSES OF FLASH

1. Material Too Hot at the time of injection and in the mold.

2. Injection pressure is too high.

3. Excessive Feeding of the material in the mold.

4. Improper or Uneven feeding of the material.

5. Poor parting line or the mating surfaces of the mold.

6. Mold deficiency means problem in the mold manufacturing.

7. Injection Pressure is higher than Clamping pressure.

8. Erratic or uneven or improper cycle time.


TROUBLE SHOOTING THE FLASH

TEMPERATURE :  

  • Check the cylinder temperature that means check the temperature of your barrel make it low if it is higher.
  • Reduce the temperature  of the nozzle that is an important aspect.
  • Reduce the mold temperature if it is higher.

MOLDING SETTINGS :

  • Increase the clamping force to make proper clamp.
  • Reduce the injection pressure.
  • Reduce the time of injection.
  • Reduce the injection time and speed.
  • Reduce the delay time.
  • Filling rate of material in mold should be proper and balanced.
  • Should not be interepted the flow in molds.
MACHINE SETTINGS :

  • Projected area of the molding part should not be larger than clamping capacity of the mold.
  • Check the position of mold it should be proper.
  • Maintain the clamping pressure.
  • Machine platen should be parellel.
  • Tie bar should be equally strained.
  • Maintain the consistent cycle.
MOLD SETTINGS :

  • Core and cavities must be sealed properly.
  • Core and cavities must be on the line.
  • Mold plate should be parallel.
  • Make Proper Support For Core and Cavities.
  • Mold must be sealed completely at the time of molding the product.
  • Check out for some other material that should not be sticked in between or any other thing should not be in between the molds.
  • There should be proper venting in the mold.
  • Approx size of vent is required vent should not be too large.
  • Land area around the cavity should not be too large it reduces the sealing pressure of the core and cavity.

Comments

Post a Comment

Popular posts from this blog

COMPLETE PROCESS PAGE OF INJECTION MOLDING MACHINE -1

Image
This page comprises of the most important process parameter. Cycle time Set  The set cycle time acts as a monitoring time for the completion of cycle. If, due to some reason, the cycle fails to complete within the set time, the machine will signal an alarm.  Actual: The time taken by the machine to complete one cycle. The set cycle time should be higher than the actual cycle time.          Cycle time - last shot                     #   The time taken by the machine to complete the previous shot. Useful for checking the effect of a change in the process parameter.         Blocking time                 #  Blocking time starts after the set cycle time expires. At the end of blocking time the machine goes into shut-off mode as per the switch off matrix setting.         Pa...
Read more

TROUBLESHOOTING WELD LINES / FLOW MARKS IN INJECTION MOLDING

 WELD LINES AND FLOW MARKS MAJOR CAUSES FOR THE DEFECT : Molten plastic material is too cold in the mold after injection. when there is an excessive mold lubricant in the mold. Mold is too cold . Injection speed is slow. Low injection pressure. Volatile gas are been trapped in the mold. Air unable to escape from the mold as fast as it should.           TROUBLE SHOOTING : Increase injection pressure. Increase injection speed. Increase plasticizing capacity of machine if possible. TEMPERATURE : Increase Barrel / Cylinder temperature. Increase Nozzle temperature. Increase Mold Temperature. Make proper/even/balanced cooling system for the mold. MOLD : Add proper vent on the mold. Increase the runner system in the feed channel. Increase the gate system. Increase the opening of sprue. Make necessary adjustment for the mold adjustment. Thick the particular area where the welded part is too thin. Filling rate of the material in the mold should be equal. Incre...
Read more