Fabric (woven – knitted – or nonwoven textile or cloth – etc.) – Scrim – Woven scrim
Reexamination Certificate
1999-10-21
2003-07-01
Morris, Terrel (Department: 1771)
Fabric (woven, knitted, or nonwoven textile or cloth, etc.)
Scrim
Woven scrim
C442S068000, C442S069000, C442S074000, C442S134000, C442S135000, C428S489000, C428S911000, C089S036020
Reexamination Certificate
active
06586351
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relate to a stab-resisting material consisting of a carrier coated with solid particles, which is provided on a packet of fabrics. The invention furthermore relates to the coated carrier material to be used therewith, and to clothing comprising such stab-resisting material, and to the padding based on the materials according to the invention, which is fitted into such clothing.
2. Summary of the Invention
From International patent application WO 94/09656 a material is known which is capable of withstanding cuts. In particular gloves for use by surgeons are made from said material. The surgeon must be protected against slipping of the knife he is using to carry out an operation, or against injury by fractured bones sticking out and the like. The material to be used for such gloves is built up of several layers, in particular an outside layer, an inside layer, and an intermediate layer. Grains of an abrasive material are provided between said layers. The grains used have a diameter of maximally 0.15 mm. It is important thereby that the surgeon who wears the gloves made of such a material, besides being protected by the glove, also retains the sense of touch in his hands. This is only possible if the material from which the glove is made is thin, and in the aforesaid International patent application an overall thickness of the material of maximally 1.5 mm is indicated. Gloves of this kind are capable of providing the intended effect for a surgeon. The object of the present invention, however, is to provide a material which is capable of withstanding forceful stabbing with a knife, so that the material aimed at by the invention can be used in clothing for police officers, soldiers and the like personnel.
From International Patent Application WO 96/03277 a material is known which provides protection against stabs of a knife and against the impact of bullets and the like, so that such a material can be used in a bulletproof vest which is also capable of withstanding knife stabs. The core of the material is obtained by coating a carrier of Aramid (an aromatic polyamide) with a ceramic by means of plasma sputtering. Thus a ceramic coating having a thickness of maximally 100 micrometers (less than 0.1 millimeters), preferably 20-40 micrometers, is applied to the layer of plastic material. The presence of the ceramic coating on the carrier of plastic material makes the article of clothing comparatively stiff. The object of the invention is to provide article of clothing which is flexible and easy to wear, but which nevertheless provides the required resistance against knife stabs.
From EP-A-0 499 812 an article of clothing is known which is resistant against the impact of bullets as well as to attack with a knife. Grains of glass or ceramic material having a diameter of 4-18 mm are thereby provided on a carrier. Such a material is relatively heavy and not very flexible, but it is effective in preventing penetration by a bullet, although it is less effective against knife stabs.
Research directed at finding a material which is capable of resisting knife stabs and which is easy to wear has resulted in the development of the material as referred to in the introduction, which is characterized in that the coating on the carrier consists of abrasive particles having a diameter of 0.1-3 mm, and that the packet of fabrics is thicker than 1.5 mm.
From U.S. Pat. No. 4,292,882 a material for manufacturing a bulletproof vest is known. The material is built up of several layers of fabric, whereby in particular layer M contains ceramic particles. Said particles are embedded in the fabric by means of a resin or the like, and they are connected together. Any openings between particles are filled with smaller particles. Furthermore, said particles are practically completely enclosed by the bonding resin material, and the various layers are interconnected in many places, so that a laminate is obtained. Said US patent specification does not pay any attention to the operation of the material in preventing penetration with stab weapons. In addition, the material is rigid and not very flexible to wear, so that its wearing comfort is less than satisfactory.
The material according to the invention may be used as a stab-resisting layer, and in particular as lightweight and three-dimensionally flexible and pliable layer or layers, or be used in combination with an underlying packet of fabrics. The material offers the human body a very high degree of protection against stab weapons and sharp and/or pointed objects, such as knives, stilettos, axes, needles and the like. Thus, protective clothing can be obtained for police officers, warders and other officials responsible for order, so that these persons are provided with better protection against stab weapons. Said better protection can be combined-with providing a desired wearing comfort of protective clothing, because the material is flexible and pliable and low in weight. More specifically, these desired properties are obtained by using a material as defined in the subclaims.
According to the principle of the invention the tip and the cutting surface of the knife are damaged when the stab weapon comes into contact with the abrasive particles, after which the underlying protective layers, such as the packet of Aramid fabrics, can stop the damaged knife or slow it down so strongly that the eventual degree of penetration of the protective clothing is acceptable. Said damaging is realised by the presence of abrasive particles, which have been provided on the carrier by means of an adhesive. Another advantage is the fact that the degree of protection does not depend on the angle at which the knife hits the protective layer. The protective layer does not have a preferred orientation, so that the material can be used in all possible directions for manufacturing articles of clothing, and be cut out so as to be tailor-made for the wearer of the protective clothing.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
According to the invention, a material is made which is built up of fine-grained abrasive particles having the diameter of 0.1-3 millimeters, preferably 0.3-0.9 millimeters, which are bonded to a supporting synthetic fabric or carrier by means of a film of adhesive. One or two layers of said coated carrier material are placed on a packet of fabrics. The material thus obtained possesses the stab-resisting properties. The adhesive is applied to the carrier before the abrasive particles are strewn thereon. Then the unbonded excess abrasive particles are removed by turning the carrier upside down or beating it out, and finally the adhesive is cured or dried. The carrier is preferably an Aramid fabric (930 dTex yarn, such as TWARON® CT (an aromatic polyamide) or KEVLAR® 129 (an aromatic polyamide) having a weight of 200 grams/m
2
). The packet of fabrics is preferably made of the same Aramid fabric as the carrier.
In principle it is possible to use synthetic fabrics for the carrier. Experiments have shown, however, that the best results are obtained by using fabrics made of ballistic Nylon (an aliphatic polyamide) or Aramid fabrics. Normally, Aramid fibers are partially coated with oils or other lubricants to facilitate weaving. Aramid fabrics are often treated with water-repellant substance, because moisture has an adverse affect on the ballistic performance of Aramid. According to the invention, it is preferred to use Aramid fabrics from which these auxiliary substances have been removed prior to weaving, and which have not been subjected to the water-repelling treatment. This leads to an improved bond between the abrasive particles and the carrier fabric, due to a better adherence of the film of adhesive to the Aramid carrier.
From EP-A-0 499 812 it is known that relatively large abrasive particles have a positive effect on the ballistic properties of a composite. Projectiles, such as bullets, are damaged and fragmented by said abrasive particles, as a result of which they can do considerably less
Guarriello John
Morris Terrel
Oliff & Berridg,e PLC
Twaron Products V.O.F.
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