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Infusible unidirectional fabric

a technology of unidirectional fabrics and fabrics, applied in the direction of mechanical equipment, machines/engines, transportation and packaging, etc., can solve the problems of reducing the maximum achievable fiber volume fraction of a composite made with such reinforcements, not offering any improvement in mechanical properties, and typically imparting performance penalties on the final composite system

Inactive Publication Date: 2014-05-29
MILLIKEN & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a special fabric made up of fine fibers that are arranged in one direction. This fabric has a high percentage of void spaces between the fibers, which make it very lightweight and flexible. A bridge is a connection between two fibers, and there are many of them in the fabric. These bridges make a network of fibers that are all connected to each other. The volume fraction of voids in the fabric is between 8 and 70%, and the volume fraction of fibers is between 35 and 85%. The bridges have a minimum width of less than 2 millimeters. This special fabric has unique properties that make it useful in various applications.

Problems solved by technology

These fabric forms typically impart performance penalties on the final composite system.
The stitch yarns typically create a separation or gap between rovings or tows within a fabric and between layers of fabric while not offering any improvement in mechanical properties.
Furthermore, the gaps created by the presence of the stitch yarns reduce the maximum achievable fiber volume fraction of a composite made with such reinforcement.
Finally, the fiber waviness negatively impacts several structural properties of composites reinforced with such systems such as tensile modulus and compression strength.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Infusible unidirectional fabric
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  • Infusible unidirectional fabric

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0108]An unsaturated polyester control sample was made using the sample layup procedure using the 090 fabric and the ±45 fabric. The stacked textiles were infused in a standard vacuum infusion apparatus at a vacuum of less than 50 mbar with unsaturated polyester resin (Aropol Q67700 available from Ashland) and 1.5 parts per hundred resin (phr) methyl ethyl ketone peroxide (MEKP). The resin flow direction was along the 0° direction of the 090 fabric. The panel was cured at room temperature for more than 8 hours and further post cured at 80° C. for more than 4 hours. Fatigue testing of the unmodified glass reinforced unsaturated polyester composite at R=0.1 with a load of 1450 N / mm of specimen gage section width measured a lifetime of approximately 1×104 cycles.

[0109]Example 2 to Example 7 showed how the film forming preventing agents affect the infusibility of the fiber fabric. The fiberglass fabrics used in Examples 2-6, and 8 were in small widths so will be referred to herein as fi...

example 2

[0110]A fiberglass tape was made in the following manner. First, a 9600 Tex fiberglass tow from PPG (HYBON® 2026) was spread into a 20 mm wide tape by a fiber tow spreading device. Next, four of the 20 mm wide tapes were combined and aligned in the same direction to form a 40 mm wide tape with twice the original tape thickness. A SBR latex (GENCAL® 7555 from OMNOVA) was mixed with water at a SBR latex to deionized water ratio of 1:4. The fiber tape was then dipped in the coating mixture and dried in an oven at 150° C. for 30 minutes. Next, the fiber tape was washed using deionized water and dried in oven at 150° C. for 15 minutes.

example 3

[0111]A 40 mm wide, fiberglass tape was made using the same fiberglass materials and process as Example 2. A SBR latex (GENCAL® 7555 from OMNOVA) was mixed with water and glycerin at a SBR latex to deionized water to glycerin ratio of 1:2:2. The fiber tape was dipped in the coating mixture and dried in an oven at 150° C. for 30 minutes. Next, the fiber tape was washed by deionized water and dried in oven at 150° C. for 15 minutes.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

An infusible, unidirectional fabric containing a plurality of unidirectional fibers spaced uniformly in the unidirectional fabric, a plurality of bridges, and a plurality of void spaces between the unidirectional fibers. Each bridge is connected to at least 2 unidirectional fibers and at least 70% by number of fibers have at least one bridge connected thereto forming a bridged network of unidirectional fibers. The void spaces are interconnected and the fabric has a volume fraction of voids of between about 8 and 70%, a volume fraction of fibers of between about 35 and 85%, and at least 50% by number of the bridges have a bridge width minimum less than about 2 millimeters.

Description

RELATED APPLICATIONS[0001]This application claims priority to U.S. provisional application 61 / 730,677, filed Nov. 28, 2012, the contents of which are incorporated herein by reference in their entirety.FIELD OF THE INVENTION[0002]The present invention generally relates to infusible, unidirectional fabrics.BACKGROUND[0003]The development of more structurally efficient composite materials enables higher performance and more cost competitive solutions across a range of markets which use these materials. The traditional forms used for introducing dry fibers such as glass roving or carbon tow into a composite system are fabrics such as woven fabrics (having crimping) or multi-axial knit fabrics (with minimal crimping). These fabric forms typically impart performance penalties on the final composite system.[0004]Composites reinforced with woven fabrics are known to exhibit lower modulus and strength due to the extensive fiber crimping which occurs as opposing direction fibers cross over ea...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D06M15/51F01D5/28
CPCF01D5/282D06M15/51B29C70/20D04H3/004D04H3/12B29B15/12B29C70/226Y10T428/24132Y10T428/249921D06M15/564
Inventor LI, XINJOHNSON, RYAN W.RUMLER, JOSEPH E.
Owner MILLIKEN & CO
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