Extrusion blow molding is a continuous process, and contamination can have a negative effect on the bottom line of your company. Once there is contamination, it is nearly impossible to keep it from happening unless you intervene aggressively. That might be though a purging compound or a screw pull. Luckily, it is easy to purge the equipment used in extrusion blow molding.
If you have carbon buildup, you should use screw pulls. They might be necessary to use only every once in a while, but if you do not take the right preventive measures, you will have unplanned downtime. Your facility can’t afford to have to clean the screws more often than necessary since it can be costly.
Using the Right Purging Compound
One effective method of purging the extrusion blow molding machine is through the use of a purging component. Many times, you can short transitions through this compound since it can eliminate contamination and residue.
Blow molding accumulators and heads have low pressure in them, and this can make it hard to clean certain parts of them. Because mechanical components require more pressure, they might not be a good option for the application. Instead, consider using chemicals to purge. You should use the right process for cleaning screws, so you do not ruin them or cause production issues.
The type of product you will need will depend on the thermoplastic resin you are purging and the processing temperature. If contamination is an issue in your extrusion blow molding process, then the supplier might recommend using another grade.
Choose Preventive Purging Processes
Many times, companies only purge their extrusion blow molding machine when it is necessary. However, doing so might reduce your efficiency and your profits. The right purging practices can prevent downtime and reduce your line shutdowns and scrap rates. Don’t wait to do purging until it is necessary since you will already have color streaks or contamination issues then.
By regularly using a purging component, you can prevent contamination from ever happening. It often only takes a couple of system capacities of the compound to keep contamination from happening. Many companies would rather plan to have planned downtime as a result of purging than an unplanned screw or head pull.
Choose the Right Extrusion Blow Molding Machine Manufacturer
Many manufacturers will recommend that you use a program of preventive maintenance. This will help you reduce excessive purging time and prevent carbon from building up. Having excessive downtime can reduce your chances of exceeding your business goals. Your extrusion blow molding machine manufacturer can help you to maximize your productivity and efficiency. If you want to know more about purging, contact PET All Manufacturing Inc. today.