Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1997-01-30
2000-04-11
Silbaugh, Jan H
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264153, 264258, 264322, 2 25, 2 66, 2410, 2463, 428911, 425395, 425398, F41H 102, F41H 108, B29C 5108, B29C 5114
Patent
active
060484861
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a process for forming contours in aramide flat structures, in particular in textile flat structures made from aramide yarns.
2. Discussion of Related Art
Aramide fibers find application in a number of areas in which high strength, low flammability, or good antiballistic action are required. Especially important among these application areas are those serving to provide protection of persons from the impact of projectiles, splinters, and the like.
For example, bullet- and splinterproof vests are manufactured from multiple superimposed aramide-fiber woven fabrics. Such fabrics also are used in antiballistic helmets and in various applications in property protection.
Due to the increasing use of female security personnel, protective clothing must be provided that conforms optimally to female body contours. The solutions to this problem proposed in the prior art, such as are described in U.S. Pat. No. 4,183,097, GB-A 2,231,481, U.S. Pat. No. 5,020,157, or U.S. Pat. No. 4,578,821, are expensive to manufacture and moreover do not offer the wearing comfort required by female security personnel.
Aramide flat structures, in particular aramide-fiber woven fabrics, also are often used in antiballistic helmets. In this case, the shaping is performed in part by deep-drawing of the fabrics embedded in a matrix resin, such as is described in U.S. Pat. No. 3,956,447, for example. In such processes, the treatment conditions must be adjusted to the resin of the matrix. This means that, depending on the type of resin, work is performed at relatively low temperatures. Irreversible imparting of shapes in the antiballistic fabrics embedded in or impregnated by resin and forming the actual antiballistic protective layers usually cannot be achieved under these conditions.
A contouring process for aramide sheets and films is described in U.S. Pat. No. 5,273,705. Work is performed using a high quantity of a swelling agent, which enables contouring. This process is not only very expensive, but it also raises environmental concerns due to some of the swelling agents proposed.
SUMMARY OF THE INVENTION
The objective thus arose to provide a process permitting the contouring of aramide flat structures, particularly aramide-fiber woven fabrics, in a cost-effective manner without additional auxiliary agents, and exhibiting the same antiballistic effectiveness in the contoured areas as is provided in the uncontoured areas.
Surprisingly, it has been found that this objective can be met in a particularly advantageous manner if the contouring of aramide flat structures is performed by a molding process. In addition to enabling the cost-effective production of, for example, antiballistic protective clothing for women without sacrificing antiballistic effectiveness, the objective is satisfied in a particularly advantageous manner through the good body fit of the antiballistic materials provided by molding and the resulting increased wearing comfort.
DESCRIPTION OF PREFERRED EMBODIMENTS
Aramide flat structures are often used for antiballistic protective clothing. The aramides in this case usually are in the form of fibers that have been processed into textile flat structures, in particular woven fabrics. The term aromatic polyamide fibers is also common for such fibers, which are commercially available under the trade name Twaron.RTM., for example.
Aramides are understood to be polyamides structured at least in part from aromatic compounds. In forming the polyamides, for example by polycondensation of acids or their chlorides with amines, both the acid and amine components can consist either wholly or in part of aromatic compounds. Within the scope of the invention, however, aramides are understood to also comprise polyamides in which only one of the two basic components is wholly or in part formed from aromatic compounds.
A well-known and particularly often used aramide in the fiber industry consists of p-phenylene terephthalamide, i.e., the acid component in t
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Fels Achim
Holzhauer Dieter
Mohr Michael
Palzer Franz
Wintersieg Jorg
Akzo Nobel Faser AG
Poe Michael I.
Silbaugh Jan H
Triumph International AG
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