Commonly Blow Molding Products Problems Analysis That Specific and Helpful

QINGDAO, China - May 5, 2019 - PRLog -- Maybe we operate correctly during the process of production. But the quality of final products is not particular good. The quality of blow molding products is related to many factors. This blog about commonly blow molding products problems analysis that specific and helpful to you.

Problem 1:

Black Spots or Black Strips:

There are black substances or short black stripes on the surface of the product.

Analysis:

1. The raw material is detained too long in the blown molding barrel or in the runner. The raw material properties have changed.

2. There are foreign bodies in the blow molding barrel.

3. Heating line loosening. raw material degradation due to unstable heating temperature.

4.Large temperature difference of die mouth.

5. Hydraulic oil leakage inside die head. raw materials properties have changed due to contact hydraulic oil.

6. Blow molding screw and barrel wear seriously. Raw raw materials can not mix evenly.

7. The cooling water of mold isn't good. Cause large temperature difference of mold overall temperature.

8. Air accumulate inside the mold cavity due to bad exhaust. Causing raw material scorched.

9. Residual grease or lubricant in the mold contacts high temperature raw raw materials. Causing raw materials scorched.

10. The quality of raw materials is too poor and there are too many impurities.

11. The machine parameters are confused and the temperature setting range is incorrect.

Problem 2:

There are bubbles on the surface of the product.

Gas not discharged in time during blow molding enters product surface.

Analysis:

1. Blow molding raw materials are humid. Water steam evaporated and into the surface of raw materials.

2. Mold exhaust hole block up or poor exhaust. Gas can't exhaust smoothly.

3. Blow molding cycle time is too short. The gas of cavity can't exhaust quickly.

4. Error setting of pressure parameter in machine production.

5. Blow molding screw rotates too fast.

6. Screw back pressure too low.

7. There are volatile additives in the raw materials.

Problem 3:

Dumbness: Low surface finish

Analysis:

1. Insufficient blow molding pressure. raw materials are not fully compacted.

2. The temperature of raw material barrel is too low. The raw material isn't fully melted.

3. The blow molding cycle time is too short.

4. Mold temperature is too low.

5. Insufficient exhaust of mold. The product can't adhere to the inner surface of the mold.

6. Dirty and rough surface of the mold.

7. raw material is too wet. Poor fluidity in the process of production.

Problem 4:

Spray Strips

Serpentine pattern formed on the surface of blow molded products when melt flows into the front mold.

Analysis:

1. Incorrect temperature setting of raw material barrel.

2. The nozzle is too small.

3. Insufficient raw material temperature at the nozzle.

4. Mold temperature is too low.

5. The speed of spraying raw material is too fast.

6. Incorrect location of water gap.

7. The passageway of water gap is too long.

8. The quality of raw raw materials is poor. The performance is not good.

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Problem 5:

Water Strips

Two streams of raw material cannot converge during blow molding.

Analysis:

1. The mold temperature is too low. Cooling products before they are formed.

2. Insufficient clamping mold pressure. Products appear expansion mold phenomenon.

3. The pressure and speed of glue spray is too low.

4. Water gap is too small.

5. Incorrect location of water gap.

6. Water gap combination zone is too long.

Problem 6：

Cracking

Cracking tendency of products under normal environmental conditions.

Analysis:

1. Incorrect blow molding screw design.

2. The blow molding cycle time is too short.

3. raw material solidified in the passageway.

4. The glue spray pressure is too big.

5. The speed of screw or blow molding is too fast.

6. The temperature of melted raw material at the nozzle is too high.

7. The blow molding pressure is too low.

8. The raw raw material is too wet. Performance degradation.

Problem 7:

Delamination

The surface of blow molded products is delaminated and scaly.

Analysis:

1. The speed of glue spray is too slow.

2. Insufficient blowing filler.

3. The time of glue spray and keep pressure is too short.

4. The melt glue temperature of barrel is too low.

5. The mold temperature is too low.

6. The turning angle of the water gap is too thin.

7. Water gap raw material contaminated.

8. Influences of external or auxiliary raw materials.

9. The blow molding raw material is too wet.

Problem 8:

Dirty

Dirty surface of product.

Analysis:

1. Oil leakage or lubricant stains the product.

2. The unreasonable package and transport. Pollution caused by improper operation.

3. The blow molding raw material is too wet.

4. Mold surface use excessive mold release agent.

5. The workshop environment is bad.

The above list is the commonly blow molding products problems analysis. I believe you get useful something from it. If you encounter the above problems, you can try to analyze them from using aspects provided above. You see, are these problems much simpler after analysis.

Above all, we can know, the blow molding products problems are mostly related to the quality and treatment of raw material. So we should choose raw material of good quality and comform to production standards.

Besides, the blow molding machine performance and standard operation are also the influencing factors. About it, Yankang Plastic Machinery will be helpful for you.

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You can read more blog on us.

Thanks for Reading.

Sincerely Hope to Give You Practical Help.