Extrusion of a Locating Strip for the Automotive Industry

May 4, 2021

Paul Murphy Plastics produces quality extrusions for innovative projects. We were contracted by a customer in the automotive industry for a trim strip extrusion project to be used during assembly of a seat cover. The automotive seating supplier was looking for a way to locate two different fabrics on a seat cover and ensure proper placement of the seams during the adherence of the foam fill to the cover. Our solution was an innovative extrusion that could be sewn into the seam where the two fabrics joined.

The part, measuring 0.900” wide x 0.100” long x 0.002” thick with varying widths and was made of custom blended polyolefin. To aid the sewing, we used a notching press to incorporate a notching pattern to precisely line up the fabric. Once the seat cover was sewn, the tab of the extrusion was used to adhere the foam to the cover of the foam bun. After the foam was adhered, a portion of the part was torn off, leaving a finished seam and seat cover. The final product went through various inspections to confirm the profile dimensions and verify the straightness over the length of the extrusion. We also performed destructive testing to verify the tear-off feature. Our part met FMVSS and AIAG requirements.

Our extrusion part and process was an innovation in seating design and production that yielded patents for our customer. Contact Paul Murphy Plastics to learn more about how we can exceed your expectations with our quality and ability to customize our processes to meet the needs of your specific project.


Trim Strip ExtrusionStrip sewn during assembly of automotive seat cover and subsequently used to locate cover during foam application process.
Capabilities Applied/Processes
  • Primary:
  • Extrusion
  • Secondary:
  • Notching
Equipment Used to Manufacture Part
  • Extruder
  • Notching Press
Overall Part Dimensions
  • Length: Varies
  • Height .900″
  • Width .100″
Tightest TolerancesSeam Thickness: 0.002”
Material UsedCustom blended polyolefin
Material FinishTransparent
In process testing/inspection performed
  • Profile Dimensions Confirmed
  • Straightness Over Length Verified
  • Notching Locations Verified
  • Destructive testing to verify tear-off feature
Industry for UseAutomotive Seating OEM
Delivery LocationUSA and Overseas
Standards Met
  • Customer Specifications, 2D CAD Drawing,
  • FMVSS and AIAG Requirements
Product NameTrim Strip




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