Key points of blow molding process control

1) For extrusion blow molding Attention should be paid to control the sag and wrinkle defects of the parison. If the overhang is too long, the wall thickness will be reduced and the remaining material removed will increase; if the overhang is not enough and the parison is too short, it cannot be inflated.

2) Wrinkle phenomenon

When the parison drops to a certain length, it occurs because the upper melt of the parison cannot bear the weight of the parison and generates circumferential stress; generally, the melt strength is higher, the diameter expansion of the parison is small, the extrusion rate is high, and the die gap is large. Some help to improve wrinkles.

3) Uneven wall thickness

Another problem is that when the parison is lowered, the wall thickness is uneven. Usually, a hexagonal nut is installed on the die of the machine head, which can be used to adjust the gap between the mandrel and the die.

4) Exhaust

To obtain a good surface quality of the parts, you must pay attention to the exhaust. For example, the PE material is sandblasted on the surface of the mold, and the sandblasting particle size is less than 180#, and the blow mold of hard plastic is used for exhaust holes, exhaust needles and exhaust In addition, increasing the inflation pressure is also helpful to improve the appearance of the product.

DAWSON MACHINERY & MOULD GROUP
***EXTRUSION BLOW MOLDING MACHINE EXPERT***

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Blow Molding Machine Mould/ Injection Molding Machine Mold

DAWSON MACHINERY & MOULD GROUP

 

High Grade Blowing Molding Mould

 

In the blow molding process, blow molding mold is an essential and important part. A good blow molding mold makes the molding more smooth, the finished product more beautiful and smooth, and reduces the influence of burr on the appearance and use of the product.

 

About mould material:

 

* Steel S50C#: Basic material for blowing moulds, competitive price
* Steel P20#: Common blow molding mould material, medium quality
* 2316 stainless steel: High quality mould material stainless steel.
* S136H : High quality blow molding steel, very durable and strong.
* Aluminium 7075# inserted beryllium copper: the best blow molding mould material,

aluminium mould has good cooling, and beryllium copper is very durable as well.

 

Advantages

Dawson engineer team has more than 16 years of experience in blow molding industry. Our blow molding products include scraping lubricating oil bottles, daily chemical products bottles, cosmetics bottles, chemical barrels, auto parts, etc; There is not only a professional team, but also a highly configured production workshop to provide customers with the highest quality blow molding molds and complete plastic products solutions, including blow molding machines, auxiliary machines and automatic packaging lines.

1. Mould cavity & Cutting edges use high quality Stainless steel S136H, which is the best material for blowing moulds.

2. Our necking plate is using imported JAPAN material DC53,Heat treatment to HRC62.

3. Our cooling system is covered very average,all the necking area, handle area had designed perfect cooling system to make sure long time smooth running.

4. Our de-flashing unit and mask material is using High quality Aluminium alloy 6061#.

5. De-flashing cylinder all use high quality Taiwan AIRTAC cylinder.

Professional Workshop

 

Our Professional Plastic Molding Mold Workshop...

 

Applications

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