CS255091B1 - A multi-layer textile fabric, particularly suitable as a non-stick absorbent bandage - Google Patents

Abstract

The flat, multilayer textile structure is suitable, for example, as a non-adherent absorbent dressing for open wounds. It consists of at least two fiber structures, of which at least one is absorbent and contains fibers with high moisture absorption. At least one fiber structure made of hydrophobic continuous fibers is in contact with low moisture absorption below 0.5%, an elongation of at least 20% in all directions and a strength of at least 2 CN/dtex. It is connected to at least one fiber structure forming the absorbent layer by mechanical connections, e.g. by interlacing or sewing.

Description

The present invention relates to a multilayered textile structure for use in non-stick absorbent dressings for rapid wound dressing. In the basic embodiment, it comprises at least two fibrous formations, at least one of which the fibers with high moisture absorption form the absorbent component of the textile formation and the at least one other fibrous formation with low absorption moisture forming the contact layer.

Commonly used dressing materials are made mainly by conventional knitting or weaving technology, from yarns containing hydrophilic fibers, such as cotton or viscose staple. Some types of these dressings are impregnated with medicaments or include bleeding stoppers, antimicrobial agents and the like.

Advances in the manufacture and application of this medical material are known types of laminated dressings with at least one fiber surface layer which readily penetrates moisture and a absorbent layer deposited thereon which partially or completely absorbs the moisture. From the point of view of known methods of production and bonding of used layers, absorbent dressings made by paper technology, needling, bonding, gluing with starch-based products or by ultrasonic bonding predominate, with a large number of variants with respect to perforation of layers, using self-adhesive edges. different types and so on. In addition to fibrous materials, knitted fabrics, fabrics, nonwovens, foils are used in the layers.

Various methods of manufacturing and different compositions of absorbent dressings are known from the patent and technical literature, for example from one double-fiber web, in which one layer comprises inert polyolefin fibers and the other layer viscous or cotton fibers and the needles are joined by needling.

From the results of the application of the known bandages used in medical practice so far, there has been a demand for their adhesion and for a perfect copying of the surface of the human body, which presupposes a suitably chosen material composition, especially the skin-contacting layer. It is therefore an object of the invention to provide a suitable material composition of the contact layer of the dressing, its structure and a convenient way of bonding the layers to each other. To achieve these objectives, a non-stick absorbent dressing in the form of a sheet-like, multi-layer textile formation comprising at least two fibrous formations, i.e. absorbent layers comprising high moisture absorption fibers and a contact layer comprising low moisture absorption fibers, is directed. It is an object of the present invention to provide a fibrous formation forming a contact hydrophobic web of continuous filaments having a moisture absorption of less than 0.5% having a ductility of at least 20% and a strength of at least 2 CN / dtex in all directions.

This constant hydrophobic layer is bonded to the at least one other hydrophilic fiber formation by mechanical bonds, for example, through a weave without a binder thread.

Preferably, the fibrous formation forming the contact layer in the most adhesive absorbent dressing is formed from a web of endless hydrophobic, randomly arranged fibers based on an inert polyolefin, for example polypropylene fibers. High absorbency hydrophilic fibers, such as cotton fibers, viscose staple fibers or cellulosic fibers in the form of a modified high viscosity staple fiber, can be used in the absorbent layer.

Due to the flexibility of the contact layer of continuous, especially randomly oriented fibers, perfect contact of the dressing material with the uneven surface of the human body is ensured. The method used to join the fiber formations together with the material composition and the structural configuration of the contact layer has eliminated the main cause of the formation of rigid dressings, which, while fulfilling the functional properties, do not sufficiently follow the shape of the human body. By using the absorbent dressing according to the invention, there is no danger of irritating the wound and its surroundings by protruding loose fibers, as is the case, for example, with the use of staple fiber materials. It is also possible in the case of lumpy absorbent dressings to melt the edge fibers of the contact layer by means of a heated chopping template so that the fibers do not protrude from the aligned edges and penetrate into the open wound.

BRIEF DESCRIPTION OF THE DRAWINGS The invention is explained in more detail based on several exemplary embodiments of the non-stick absorbent dressing of the present invention.

Example 1

The absorbent dressing material used, for example, to cover open wounds, was made from a single fibrous formation forming a hydrophobic contact layer of the dressing of infinite randomly arranged polypropylene fibers of 3.75 dtex, having a basis weight of 30 to

-2 -1 50 g.m with an elongation of 25% in all directions and a strength of 3 CN dtex, made under the nozzle. The second fiber formation was made on a carding machine from a viscose staple of 1.6 dtex, mm length, which is a cotton type. These two fiber formations joined together on a Araohne cannon interlocking machine. 40 with POPh KK binding threads, with a fineness of 84 dtex f 25 in a counter-directional jersey binding.

The blank thus obtained was cut into strips of desired length and width, and the strips were packaged in airtight containers, sterilized by ionizing Co radiation at a dose of 25 KGy.

Example 2

The dressing material consists of the contact hydrophobic layer according to Example 1, while the absorbent layer consists of 50 wt. viscose staple fibers of cotton type 1,6 dtex, 31 mm and 50% by weight cotton staple lengths 25 to 35 mm. The joining of both these fiber formations again on the Arachne machine interlocking machine. 40 under the same conditions as in Example 1.

Individual pieces of dressings were punched out of the preform manufactured by means of a chopping template heated to the melting point of the contact hydrophobic layer materials, the peripheral polypropylene fibers of which were slightly thermoplastically bonded by the heated chopping template so that the free ends did not penetrate the wound.

Example 3

A multi-layer textile fabric for medical purposes comprising a contact hydrophobic layer according to Example 1 and an absorbent layer comprising a mixture of 50% by weight of polyester fibers of 1.7 dtex of 38 mm length and 50% by weight. cotton fibers of any fineness and staple, the latter being randomly mixed on a conventional carding composition. The connection of the two fiber formations occurred again on the interlocking machine of the ARACHNE guns.

- see example 1.

Example 4

The composition of both the absorbent dressing and absorbent dressing layers of any one of Examples 1 to 3, except that an outer layer of randomly arranged poles of 2.75 dtex propylene fibers having a basis weight of an outer layer of 50 gm was used in addition to the contact and absorbent layers. interweave according to Example 1.

Example 5

On the interlocking machine ARACHNE works. 40, two fiber formations were bonded by a weave-free interlocking method, one of which contained 3.75 dtex polypropylene fibers,

-2 -1 basis weight 40 gm and elongation in all directions 30% at 3 CN dtex for use on a constant layer of absorbent dressing. The second fibrous formation forming the absorbent layer of the dressing comprised a 30 mm cotton staple and a 30 mm viscose staple in a ratio of 40% to 60% by weight. Finishing operations according to Examples 1 and 2.

Claims (5)

1. A multi-layer textile fabric, particularly suitable as a non-adhesive absorbent dressing for the rapid coverage of open wounds, comprising at least two fibrous formations, at least one of which is absorbent and contains fibers of high moisture absorption and at least one of them is low moisture absorption contacting. characterized in that the fibrous formation forming the contact hydrophobic filament layer with a moisture absorption below 0.5% exhibits an elongation of at least 20% in all directions and a strength of at least 2 CN / dtex, and is bonded to at least one other absorbent fibrous formation layer using mechanical joints, Even for example by interlocking or sewing. AND 2. A multi-layer textile fabric according to claim 1, characterized by; that the bonding of the fiber formations is effected by means of mechanical bonds in the form of an interlocking weave without the binding thread by its own fibers. 3. A multi-layer textile structure according to claim 1 or 2, characterized in that the fibrous formation forming the contact hydrophobic layer is formed from a web of continuous, randomly oriented fibers. 4. The textile multilayer structure of any one of claims 1, 2, and 3, characterized in that the filaments with a moisture absorption below 0.5% are hydrophobic fibers based on an inert linear polyolefin, for example polypropylene fibers. 5. The textile multilayer structure of claim 1, wherein the absorbent layer fibers are hydrophilic fibers, such as cotton, viscose staple or cellulosic fibers in the form of a modified viscose staple with high absorbency.