How to Solve Blow Moulding Problems?

When you are planning to buy extrusion blow moulding machine, make sure you purchase from a well-known manufacturer. The most important thing is the blow moulding machine is run constantly and made various products. Even there everything runs smoothly; the problem is there. There are various reasons behind the problem like using wrong material, a faulty mould or not following the process.

And in this scenario, you directly contact the machine manufacturer which you bought the machine. With the below information you can solve some of the problems by yourself.

What to do with Oval Necks and Rocker Bottoms?

The reason behind the oval shape neck and rounded bottoms is formed due to warpage. If there is uneven and insufficient cooling before removing from the mould can be a reason. The solution is to increase the flow. And if the high stock temperature is the reason, drop down in the small increments and check it again.

Wall Defects

Make sure that there is no moisture in the melt. And for the solution, warm up the resin to the required temperature to remove moisture from it before it enters in the extruder.

Cold Spots

In the extrusion blow moulding machine, sometimes you will find cold spots on the wall of a blown object as non-homogeneous areas. It may due to insufficient back pressure. Another reason is also a non-uniformity in the melt.

Weld Thinning

When the weld thinning happens the main reason behind is the high stock temperature. It is due to when the mould closes, making the pinch-off and the process doesn’t force into the weld line and there is a weak weld. In the solution, you can slowly reduce the stock temperature on the blow moulding machine. And if this is not helpful, try to adjust the length of pinch-off land.

Tearing

Many blow moulding machine owners face the problem of tearing. There are various reasons for it. Like the length of the pinch-off land is too long which you have to shorten. There is an also reason for worn pinch-off. The solution is to roll it back temporary or refurbish it.

Poor Surface

If there are pits on the bottle surface, the reason is imperfect parison. The subpar mould surface also is a problem. If there is a problem, you will have to refinish it. With the air vent, the parison has enough time when the mould is hot.

Where to buy Quality Machine?

It is suggested to buy a blow moulding machine from an experienced company. Also, check the warranty and guaranty of the machine.