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Consult with our LFT experts

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long fiber reinforced thermoplastic composites

+1 507.454.4334 | E-mail

Long Fiber “Pultrusion” Manufacturing Process

PlastiComp manufactures our Complēt long fiber composite pellets using a pultrusion process.

We start with tows of continuous fiber which are pulled from creels through a proprietary impregnation die where the fiber becomes melt impregnated with thermoplastic polymer.

A compounding extruder connected to the impregnation die functions as a melt pump feeding molten thermoplastic polymer into the process.

Instead of simply coating fiber tows with polymer – inside PlastiComp’s impregnation die individual filaments in the fiber tows are spread apart so each is encapsulated with thermoplastic polymer.

Our process achieves higher “wet-out” of individual fiber filaments which is necessary to create a strong bond between the fiber and thermoplastic polymer. This fiber to polymer bond is key to obtaining optimum performance and having a true composite material.

Depending on the type of fiber being pultruded, tows have from 2,000 to 50,000 individual filaments of fiber with diameters ranging from 7 to 14 microns.

The melt impregnated fiber exits the die as continuous composite strands which are cooled using water and/or air until solidified. Strands then pass through a puller unit which keeps the manufacturing process continuously operating and provides its pultrusion (pulled extrusion) name.

Finally, a pelletizer cuts the composite strands to a specified length. Typically for injection molding processing 12 mm (0.5 inch) long pellets are the standard length to facilitate material handling and feeding into processing equipment. Pellet length can be varied from 6 mm (0.25 inch) to 48 mm (2.0 inches) depending on thermoplastic composite forming process requirements.

As the fiber in our long fiber composites is continuous throughout the length of each cut pellet, long fiber materials have a higher fiber aspect ratio than short fiber filled plastics. Higher fiber aspect ratio provides the thermoplastic polymer with more ability to transfer energy to the stronger reinforcing fibers when the plastic comes under stress and also to dissipate that energy over a wider area.

Talk With Our LFT Experts

PlastiComp's long fiber technology experts can tailor an LFT material to meet your specifications.

Discover Your Solution

PlastiComp's Capabilities

Solution Collaboration
We work with you to design and make your products better

Custom Composites
We produce materials to your performance and design needs

Design & Analysis
We work with you to concept and ensure your parts perfom.

Processing & Forming
Quickly develop and maximizie long fiber’s benefits.


LFT Solutions

PlastiComp extends long fiber technology to achieve unique material solutions

Complēt Long Glass Fiber
Structural performance in polymers form PP to PEEK.

Complēt MT
Ultra durable for demanding applications.

Complēt Long Carbon Fiber
Reduce weight or obtain higher performance.

Complēt Hybrid
Cost effectively adopt carbon fiber performance.

Improved flow fills thin walls or enhances surface aesthetics.

Multifunctional Composites
Combine reinforcement with functional performance.

pallet with pellets and paint brush

English SI Metric Test Method
Specific Gravity 1.60 1.60 ASTM D-792
Tensile Strength 32,000 psi 221 MPa ASTM D-638
Tensile Modulus 2,200 ksi 15172 MPa ASTM D-638
Tensile Elogation 2-3% 2-3% ASTM D-638
Flexural Strength 49,000 psi 338 MPa ASTM D-790
Flexural Modulus 2,400 ksi 16500 MPa ASTM D-790
Notched Izod Impact (72 °F / 22 °C) 6.0 ft·lb/in 320 J/m ASTM D-256
Notched Izod Impact (-60 °F / -51 °C) 13.0 ft·lb/in 694 J/m ASTM D-256
Un-notched Izod Impact 27.0 ft·lb/in 1440 J/m ASTM D-4812
DTUL @ 264 psi (1820 kPa) 475 °F 246 °C ASTM D-648
Rev 08/10
Product Literature

Product literature

Receive information on PlastiComp’s portfolio of Complēt long fiber solutions.

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