Wet use chopped strand glass as reinforcement in extruded products

a technology of extruded products and glass, which is applied in the field of thermoplastic composites, can solve the problems of increasing the modulus or stiffness of the siding product, affecting the handling effect, and affecting the quality of the product, so as to improve the handling effect and improve the wind resistan

Inactive Publication Date: 2006-05-18
OWENS CORNING INTELLECTUAL CAPITAL LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] It is an advantage of the present invention that the extruded siding products reinforced with WUCS glass fibers have improved handleability, improved wind resistance, and are able to withstand long periods of high temperature and sun exposure as well as thermal cycling.

Problems solved by technology

Unfortunately, glass reinforced vinyl siding products made from polymeric resins such as PVC would be too expensive to manufacture, primarily because dry use chopped strand glass (DUCS) requires that the glass be formed, chopped, dried, and cured prior to use in such an extrusion process; each step incurring manufacturing cost.
Such fillers may increase the modulus or stiffness of the siding product and may decrease the amount of movement that can occur as a result of a change of temperature of the siding.
However, conventional PVC siding products are limited in the loading of these fillers due to impact resistance (as required by ASTM D3679) and processing conditions, and, as a result, typically contain only a relatively small amount of inorganic fillers.

Method used

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  • Wet use chopped strand glass as reinforcement in extruded products
  • Wet use chopped strand glass as reinforcement in extruded products
  • Wet use chopped strand glass as reinforcement in extruded products

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0064] A PVC rigid extrusion compound was metered into the feedthroat of a 130 mm twin screw extruder at the rate of 2200 lb / hr. At the same time, WUCS glass fibers having a 12% moisture content were metered via a side mounted vibrator feeder into the feedthroat of the extruder at 33 lb / hr to give a 5% by weight glass composition. A low pressure zone located approximately 60% of the way down the barrel of the extruder was used to remove the moisture from the glass filled compound. The extruder was fitted with a sheet die to produce a 48 mils thick product. The product was produced on an extrusion line such as is depicted in FIG. 6. The product met the requirements of ASTM D3679 as tested.

example 2

[0065] A polypropylene blended with 2% of a maleic anhydride modified polypropylene was added to a feedthroat of a single screw 60 mm extruder. Approximately 16 inches downstream, wet use chopped strand glass fibers were added via a feedthroat in a high volume zone (e.g., a first low pressure zone). Located approximately another 16 inches down the barrel was a second low pressure zone fitted with a vacuum system set at 15 inches of mercury vacuum to remove moisture from the compound in the extruders. The extruder was fitted with a sheet die to extrude a 125 mils thick product.

[0066] Example 3

[0067] A compound formed of a polyvinyl chloride (PVC) resin, impact and process modifiers, a tin based stabilizer, a blowing agent, and an inorganic filler such as calcium carbonate was pre-blended with 15% of WUCS glass fibers having a 12% moisture content and fed into the feed throat of an 88 mm twinscrew extruder. The foamed extrudate was calibrated into a board.

example 4

[0068] The compound described above in Example 3 was fed into the feed throat of an 88 mm twinscrew extruder concurrently with WUCS glass fibers having a 12% moisture content at a rate sufficient to result in a foamed extrudate with 15% glass fiber content. The foamed extrudate was formed into a board.

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Abstract

A method for incorporating wet use chopped strand glass (WUCS) in a screw extrusion process is provided. A polymeric resin is added to an extruder in a polymer feed zone and conveyed to a first compression zone where the resin is at least partially melted. The molten resin is conveyed to a high volume zone where WUCS fibers are added. In the high volume zone, the flights of the screw may have a greater pitch to facilitate the introduction of the WUCS into the extruder. The molten resin / fiber mixture is conveyed to a second compression zone where the resin and fibers are intimately compounded. Next, the molten resin / fiber mass is conveyed to a low pressure zone where moisture evaporated from the fibers is released through an opening. The resin / fiber mixture is then conveyed through a compression / die feed zone to further compound and mix the resin and fibers.

Description

TECHNICAL FIELD AND INDUSTRIAL APPLICABILITY OF THE INVENTION [0001] The present invention relates generally to the formation of thermoplastic composites, and more particularly, to the incorporation of wet use chopped strand glass (WUCS) in an extrusion process. BACKGROUND OF THE INVENTION [0002] Typically, glass fibers are formed by drawing molten glass into filaments through a bushing or orifice plate. Normally, a sizing composition is then applied to the drawn filaments, the sizing containing lubricants, coupling agents, and film-forming binder resins. The aqueous sizing composition provides protection to the fibers from interfilament abrasion and promotes compatibility between the glass fibers and any matrix in which the glass fibers are to be used for reinforcement purposes. After the sizing composition is applied, the fibers may be gathered into one or more strands and wound into a package or, alternatively, the fibers may be chopped (typically while wet) and collected. The co...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B29C47/06B29C47/38B29C48/07B29C48/12B29C48/395B29C48/76
CPCB29C47/0004B29C47/0019B29C47/003B29C47/1045B29C47/767B29K2105/06E04F13/0864E04F13/083B29K2105/12B29C48/022B29C48/07B29C48/12B29C48/2886B29C48/767
Inventor O'BRIEN-BERNINI, FRANK C.VERMILION, DONN R.SCHWEIGER, SCOTT W.GUHDE, BRIAN J.GRAHAM, WILLIAM D.WALRATH, GEORGE A.MORRIS, LESLIE A.
Owner OWENS CORNING INTELLECTUAL CAPITAL LLC
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