BG Machine - PVG Extrusion Tooling & Equipment
PVC Extrusion Tooling & Equipment
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EXTRUSION POST-FORMING

Design and Processing Information

Extrusion post-forming is the process of continuously forming a hot, flat, extruded sheet into a shape. This process is usually done at the extrusion process, and is normally done with rigid PVC. Typical products formed by this process are vinyl siding and accessories, vinyl skirting and accessories, rain gutter, some fence products, and some decking products. Some of the advantages of the post-forming process include:

  1. Processing speeds are much greater with the post-forming process. Typical line speeds for post-formed vinyl siding range from 90 to 150 feet per minute, with extrusion rates running as high as 3500 pounds per hour.

  2. Because a standard sheet die is used as the extrusion head, very little die tuning is required for new products. Formulations and colors changes can be made often with little or no effect on the extruded sheet. The simple adjustment of the lip bolts can even out the thickness of the sheet if changes are required.

  3. With the advent of co-extrusion and tri-extrusion dies, capping materials can be run at a minimum thickness, creating a more cost-efficient product. Also, different materials can be used as the capping material versus the substrate material. The cost of the extruded material can be greatly lowered if only the cap contains the weatherable materials. Most sheet dies do not have to be re-cut to run the different materials.

  4. Each sheet die can be used to run different products that are similar in undeveloped lengths (undeveloped length is the cross-sectional width of a post-formed product before the product is formed to shape). The hot, extruded sheet can be stretched some at the die by the embosser (nip device) and/or by the haul-off (puller) to adjust the sheet width before the post-forming process.

  5. The extruded sheet can be embossed with many different patterns after the sheet's exit from the die. Laminate materials also can be applied at this time. Neither of these processes greatly affect the ability to form the sheet to the desired shape.

  6. The calibration (sizing) tooling is simple to set-up and run. The amount of calibration tooling required to do the forming greatly depends on the accuracy required for the finished product.

  7. The down-stream equipment required to run a post-formed extruded product is similar to the equipment required to run profile extrusions. Cutting, punching, and notching equipment can also be used in-line with the post-formed parts.

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