Coating Applications for Plastics Molding

Fouling Resistant, Low Surface Energy, High Temperature Coatings  

Improve Plastic Mold Efficiency and Prevent Surface Sticking

Mold fouling or sticking is a costly surface problem that occurs in industrial applications, extrusion and casting operations. Surface sticking can create contamination, reduce efficiency, promote corrosion, reduce flow, increase maintenance, and ultimately inflates cost while worsening performance. SilcoTek® high temperature coatings reduce fouling and interaction with the underlying surface, improving quality and saving money. 

SilcoTek's CVD silicon coatings like Dursan® and Notak® bond to the surface and change the surface energy and inertness, preventing adhesion and improving mold release.  The coating's low energy surface prevents the attachment of flow path chemicals to the surface.

The benefits of a fouling resistant barrier coating in plastic mold release applications include:                                                                                 

  • Improved up-time, reduced maintenance
  • Better product release from molds
  • Takes the place of release chemicals
  • Prevent release chemicals from contaminating parts
  • No post cleaning of molded parts needed
  • Does not transfer onto the plastic part during molding 
  • Improved corrosion resistance of components 
  • Improved process efficiency
  • Improved wear resistance
  • Improved surface lubricity

 

Get all the information about the benefits of SilcoTek coated flow paths.

Get Our Introduction to  Improving Plastic Mold Operations

 

mold release applications graphic header 1 3 18-033752-edited

Anti Fouling Coating Applications for Plastic Extrusion and Mold Release

Plastic fabrication equipment can benefit from precision CVD coatings to prevent damage to molds or extruders.  Outgassing, moisture acidity, and abrasive wear can take their toll on mold quality and result in costly replacement or repair. SilcoTek® coatings offer greater wear resistance while reducing friction and improving corrosion resistance.   Applications include:

 
  •   Injection molds 
  •   Extruder screws 
  •   Cooling tubes
  •   Flow valves
  •   Dies
  •   Resin feed tubes
Mold image 6  

 

Application Data

Need an inert surface that's durable and corrosion resistant?  Dursan offers superior performance and durability, making it an ideal coating for extrusion and plastic molding operations.  Heating of mold resins, such as those in PVC operations, leads to off-gassing of corrosives like HCl.  Dursan offers superior corrosion performance on stainless steel molds.

Corrosion Dursan ASTMG31

 

Our low surface energy (high contact angle) surface combined with a low coefficient of friction improve mold flow and release. 

Many types of plastic materials that have been successfully used with our Duran coating including:
  • Polyethylene Terephthalate (PET)
  • Polyurethane (PU)
  • Polypropylene(PP)
  • Pebax
  • Nylon

Comparative testing shows the Dursan® coated surface improves lubricity by 36% over stainless steel while reducing surface energy by up to 8x.

Notak hydrophobicity static CA

 

Coefficient of friction graph

Comparative pin-on-disk wear and friction testing shows the Dursan® coated surface reduces wear by over 50% compared to uncoated stainless steel.

Wear Pin on Disc Steel vs Dursan

Resources

 

 Watch our coating demonstration videos to see how our coating technology improves performance and learn about our company.

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If you have a technical question about how our coating technologies will perform in your application, contact our Technical Service Team and ask the experts.

Follow our Ask the Expert series on LinkedIn

 

If you would like to buy a coated product directly from the manufacturer, go to our Buy Coated Products page.

Buy Coated Products

 

 

To get the most out of your process and product, coat all flow path components and systems.  This includes:

Critical Flow Paths

  • Molds
  • Dies
  • Extruders
  • Tubing, valves and fittings

  

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