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Compacted, chopped fiber glass strands

a technology of fiber glass and fiber glass strands, which is applied in the field of compressed, chopped fiber glass strands, can solve problems such as undesirable processing, and achieve the effects of good dispersion in resins, good flowability, and good compatibility with resins

Inactive Publication Date: 2006-07-06
MENG JIAN +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention is about a type of fiber glass strand that is compacted and chopped. These strands have various desirable properties such as small size and uniform size distribution. They can be easily mixed with resins and have good dispersion. These strands can also have good flowability and compatibility with the resins used for reinforcement. The compacted chopped strands have a larger cross-sectional area than the original continuous strands that were chopped. The sizing composition used to coat the fiber glass filaments in the strands includes a film-former, a coupling agent, and polyalkylene oxide. The polyalkylene oxide can be polyethylene oxide. Overall, this invention provides a way to make a high-quality fiber glass strand that is easy to use in various applications."

Problems solved by technology

This process can be undesirable, however, due to the labor and handling associated with moving the totes.

Method used

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  • Compacted, chopped fiber glass strands
  • Compacted, chopped fiber glass strands
  • Compacted, chopped fiber glass strands

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0131] Compacted chopped strands were prepared as described above in order to compare the bundle size distributions of compacted chopped strands coated with comparative sizing composition A and sizing composition 1.

[0132] The bundle size distribution is determined using a sieve with a Tyler #5 screen size. One hundred grams of compacted chopped strands were placed on the screen and shaken for ten seconds. A percentage of large bundles for each one hundred gram sample was determined by weighing the amount of compacted chopped strands that did not pass through the screen.

[0133] The percentage of large bundles is an indicator of bundle size distribution. In general, a plurality of compacted chopped strands with a low percentage of large bundles is believed to disperse better in a resin.

[0134] For this example, five pound samples of compacted chopped strands were collected from the exit end of the dryer every hour. A total of forty-eight samples of compacted chopped strands prepared ...

example 2

[0135] In this Example, physical properties of compacted chopped strands prepared using the sizing compositions in Table 1 were compared to determine whether the presence of the alkylene oxide polymer would have a negative effect on the properties.

[0136] Four sets of samples were prepared according to the “Preparation of Compacted Chopped Strands” section above. Two of the sample sets were control samples (using sizing composition A from Table 2) and two were sets of compacted chopped strands according to an embodiment of the present invention (using sizing composition 1 from Table 2). Two additional sample sets were also prepared according to the “Preparation of Compacted Chopped Strands” section above using sizing composition 1 from Table 2, except the compacted chopped strands were not dried inline. These sample sets were dried remotely using a Rexnord dryer. For the purpose of comparing physical properties, the samples dried using the Rexnord dryer are comparable to the samples...

example 3

[0140] In this Example, properties of compacted chopped strands prepared using sizing composition 1, which represent an embodiment of the present invention, were compared with uncompacted chopped strands prepared using comparative sizing composition A and compacted chopped strands prepared using comparative sizing composition A. Control #4 represents uncompacted chopped strands prepared using comparative sizing composition A. In the preparation of control #4, the chopped strands were not agglomerated by tumbling, but were dried directly after chopping, and are characterized as uncompacted chopped strands. Control #5 represents compacted chopped strands prepared as described above using comparative sizing composition A. Sample #6 represents compacted chopped strands according to one embodiment of the present invention prepared as described above using sizing composition 1. The nominal chop lengths of the chopped strands were ⅛ of an inch (˜3 millimeters). The nominal LOI for each sam...

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Abstract

Embodiments of the present invention relate to compacted chopped strands. In one embodiment, a compacted chopped strand comprises a plurality of fiber glass filaments and a residue of a sizing composition at least partially coating at least one of the filaments, the sizing composition comprising: a film-former, a coupling agent, and at least one alkylene oxide polymer, the alkylene oxide polymer comprising at least one of polyethylene oxide, polypropylene oxide, and polybutylene oxide. The compacted chopped strand, in some embodiments, has a cross-sectional area that is greater than the cross-sectional area of the continuous strand that was chopped prior to forming the compacted chopped strand. In some embodiments, the compacted chopped strand comprises a larger number of filaments per unit of cross-sectional area than the continuous strand that was chopped prior to forming the compacted chopped strand.

Description

FIELD OF THE INVENTION [0001] The present invention relates generally to compacted chopped fiber strands and in particular to compacted chopped fiber glass strands. BACKGROUND OF THE INVENTION [0002] Chopped fiber glass strands are often used as reinforcements in thermoplastic and thermoset applications. Chopped fiber glass strands are typically manufactured by either direct or indirect processing operations. Direct processing operations, such as “direct chop” operations, involve feeding a generally continuous, fiber glass strand directly from a fiber forming assembly into a chopping assembly where the strand is chopped. Indirect processing operations, such as “remote chop” operations, involve winding a generally continuous fiber strand onto a tube to form a package and subsequently feeding the generally continuous strand from the package into a chopping assembly. Packages of generally continuous fiber strands can also undergo additional processing steps, such as roving wherein mult...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D02G3/00
CPCC03C25/26Y10T428/2913C03C25/36
Inventor MENG, JIANKOLLAH, RAPHAEL O.WESTBROOK, PAUL A.NARAYANAN, RAMASUBRAMAN
Owner MENG JIAN