The Purging Diaries
Here is where we share our knowledge, experiments, news and success stories.
Why do Colour Streaks Occur?
Colour streaking can be divided into two categories. The first type is caused by material degradation, the second one is caused by pigments. Both types of streaks can appear spontaneously, even a long time after a colour change. We are going to refer fundamentally to...
What is a Purging Compound?
A purging compound is a product most thermoplastic producers use to clean screws, nozzles, mold, hot runners or die of injection molding machines and extruders. These compounds were developed to reduce machine downtimes and scrap rates during material or colour...
Quick tips to reduce scrap during material changes
Time flies! We just realized, we have spent the last 10 years working with injection molders to reduce scrap during material changes in the most simple way possible. Our statement when approached by production teams has always been: “ We can help you...
How to reduce scrap during colour changes
Every morning, after I grab my morning tea, I open my laptop and I start answering calls and emails from all over the world with the same query: How can I improve the results of my colour changes? Below, I point out the proven tips I have shared for many years, where...
The Two Main Causes of Black Specks During Production
Most of my customers working in production teams seem to understand the main reason for blacks specks appearing in production; however, carbon contamination continues to be a common headache during manufacturing. Why would this be? Since we started focusing on...
Purging Compounds: Liquid vs Mechanical
The use of purging compounds has become incredibly useful when it comes to removing the carbon residues and colour stains; as well as reducing machine downtime, notably enhancing processing efficiency. Liquid purges have growth among the product segmentation market,...
Success Stories
Pet Preform Injection Molding Colour Change
Pet Preform Injection Molding Colour Change with EasyPurge Purging Compound Opaque White to Clear Goal: Scrap and cleaning cost reduction Summary: Machine: Husky Hypet 300 Extruder Diameter: 120 mm Mould: 48 x 44.0grs Material: PET Colour: Opaque White 10% T. Oxide ...
Injection Molding Colour Change: PA6 FG 45% Black to PA6 FG 45% White
Injection Molding Colour Change with EasyPurge Purging Compound PA6 FG 45% Black to PA6 FG 45% White Goal: Reduce color change purging cost Summary: Machine: 700T Material: PA6 FG 45% Colour: Black to White Purge: 140 ml Time: 20 mins Industry: Automotive Factory...
OPAQUE WHITE to CLEAR – Color Change and Scrap reduction
Pet Preform Injection Molding Colour Change with EasyPurge Purging Compound OPAQUE White to Clear Goal: Color Change and Scrap reduction Summary: Machine: Husky Extruder Diameter: 110 mm Material: PET Colour: Opaque White to Natural Mould: 72 x 22 grs Factory...
OPAQUE WHITE to CLEAR – Color change time reduction
Pet Preform Injection Molding Colour Change with EasyPurge Purging Compound OPAQUE White to Clear Goal: Color change time reduction Summary: Machine: Netstal 3500-3700 Extruder Diameter: 135 mm Material: PET Colour: Opaque White to Natural Mould: 54 x 64 grs Factory...
PA to HDPE
Extrusion Blow Molding Material Change with EasyPurge Purging Compound PA to HDPE Goal: Material change and Black Specks Removal Summary: Machine: Moretti Extruder Diameter: 100 mm Material: PA to HDPE Colour: Black to Clear Industry: Automotive Factory Location:...
POM BLACK to PA CLEAR
Injection Molding Material Change with EasyPurge Purging Compound POM BLACK → PA CLEAR Goal: Black Specks Removal Summary: Machine: 400T Material: POM Black to PA Clear Easypurge Purging compound consumed: 6 Sachets (120 Grs) Time: 15 Minutes Industry: Automotive...
HDPE BLACK to HDPE NATURAL
Extrusion Blow Molding Colour Change with EasyPurge Purging Compound HDPE BLACK TO HDPE NATURAL Goal: Downtime reduction Summary: Machine: Mateu & Sole (Spain) Extruder Diameter: 120mm Material: HDPE Colour: Black to natural Normal results using virgin...