Products
  Fiberglass Products
  Composite Insulator
  HDPE Insulator
  Porcelain Insulator
  Drop-out Fuse Cutout
  Surge Arrester
  Overhead Line Fittings
  Insulator Accessory
   
  Supply Leads
 
Home  »  News
 
How Pultrusion Works
 
Sources: this site   Click:
 

How pultrusion works:

Developed in the 1950's by the person considered by many to be “the father of composites,” W. Brant Goldsworthy, pultrusion is the process of "pulling" raw composites through a heated die creating a continuous composite profile.

The term pultrusion combines the words, "pull" and "extrusion". Extrusion is the pushing of material, such as a billet of aluminum, through a shaped die. Where as pultrusion, is the pulling of material, such as fiberglass and resin, through a shaped die.

The pultrusion process starts with racks or creels holding rolls of fiber mat or doffs of fiber roving. Most often the reinforcement is fiberglass, but it can be carbon, aramid, or a mixture. This raw fiber is pulled off the racks and guided through a resin bath or resin impregnation system. Resin can also be injected directly into the die in some pultrusion systems.

The raw resin is almost always a thermosetting resin, and is sometimes combined with fillers, catalysts, and pigments. The fiber reinforcement becomes fully impregnated (wetted-out) with the resin such that all the fiber filaments are thoroughly saturated with the resin mixture.

As the resin rich fiber exits the resin impregnation system, the un-cured composite material is guided through a series of tooling. This custom tooling helps arrange and organize the fiber into the correct shape, while excess resin is squeezed out, also known as “debulking.” This tooling is known as a “pre-former.” Often continuous strand mat and surface veils are added in this step to increase structure and surface finish.

Once the resin impregnated fiber is organized and removed of excess resin, the composite will pass through a heated steel die. Precisely machined and often chromed, the die is heated to a constant temperature, and may have several zones of temperature through-out its length, which will cure the thermosetting resin. The profile that exits the die is now a cured pultruded Fiber Reinforced Polymer (FRP) composite.

This FRP profile is pinched and pulled by a “gripper” system. Either caterpillar tracks or hydraulic clamps are used to pull the composite through the pultrusion die on a continuous basis.

At the end of this pultrusion machine is a cut-off saw. The pultruded profiles are cut to the specific length and stacked for delivery.


Back: No Previous Next: Congratulations - Winning Electrical Co.,Limited Website Open
 
  HDPE Pin Insulator | HDPE Cable Spacers | High Density Polyethylene Insulator | Polymer Suspension Insulator | Polymer Tension Insulator | Polymer Railway Insulator | Polymer Line Post Insulator | Polymer Station Post Insulator | Porcelain Disc Suspension Insulator | Porcelain Line Post Insulator | Porcelain Pin Type Insulator | Porcelain Station Post Insulator | Porcelain Spool Insulator | Polymer Deadend Insuator | Composite Long Rod Insulator | Polymer Fuse Cutout | Porcelain Fuse Cutout | Porcelain Surge Arrester | Polymer Surge Arrester | Insulator End Fittings | Overhead Line Fittings | Suspension Clamp | Strain Clamp | Splicing Fittings | Link Fittings | Guy Wire Fittings | Protection Fittings | ANSI Insulator   Winning Electrical Co., Limited
Copyrights © 2014 All Rights Reserved