Chem-Trend supports your blow moulding process with efficient Ultra Purge™ purging solutions.

Case Study Thermoplastics Processing: Chem-Trend supports your blow moulding process with efficient Ultra Purge™ purging solutions.

Case Study Thermoplastics:
A faster, more effective solution for colour changeovers.


Purging blow moulding machines can be a very time-consuming and expensive process for many processors. Due to the design of blow moulders, in particular the head or accumulator, it can be difficult to avoid colour streaking when transitioning from a dark colour into a lighter colour. A blow moulded bottle manufacturer recently reached out to Chem-Trend for assistance with their colour changeover challenges. We worked with the customer to test and select the ideal purging compound – resulting in a 52% reduction in downtime and 35% reduction in material cost.


During colour changeovers, the moulder was consistently experiencing issues with dark colour streaking down the side of the bottles, lasting sometimes up to 4 hours. The blow moulder had tested mechanical purge compounds in the past, but was unable to find a product that was cost-effective. Thus, their alternative method for purging the machine was to run virgin HDPE after the dark colour. After carefully assessing the customer’s challenges, the Chem-Trend team recommended the Ultra Purge™ 5150 to the blow moulder. The Ultra Purge™ 5150 is a hybrid purge compound that combines the benefits of chemical and mechanical purging properties to increase the efficiency in cleaning the screw and accumulators/heads. The Ultra Purge 5150 has proven to be a superior alternative to conventional purge compounds.


With the Ultra Purge™ account manager present, a trial was conducted utilizing the Ultra Purge™ 5150. Using the Ultra Purge™ 5150, the customer was able to significantly reduce downtime by 52% and material costs by 35%. The total savings for the colour change was $243.90*. Today, the blow moulder is using Ultra Purge™ for all of their dark-to-light colour changeovers, as well as machine shutdowns and startups.

35% Decrease in material cost
Decrease in material cost
52% Reduction in downtime
Reduction in downtime

*A case study from the US market.

35% Decrease in material cost
52% Reduction in downtime


At Chem-Trend, we pride ourselves on our long history of sustainability efforts. However, it is our effect on our customers’ processes that provides the greatest impact. It goes beyond our global Footprint; it is our even wider Handprint.

Here, we achieved the following:

  • Reduction of energy usage due to more efficient production
  • Reduction of scrap by producing more usable product and reducing the need for recycling
  • Materials
  • Waste
  • Energy
A brand of Freudenberg.
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