Bandage material comprising mesh fabric

Abstract

The invention relates to a bandage material comprising a web-like fabric (10) having a warp direction and a weft direction extending perpendicularly thereto, and warp threads (14) extending in the warp direction and weft threads (16) extending in the weft direction, the fabric (10) being designed with cut, open edges (12), characterized in that the fabric (10) has a cross-sectional shape. The warp yarns (14) and / or the weft yarns (16) comprise polyester yarns and / or polyester blended yarns.

Description

Technical Field

[0001] The invention relates to a bandage material comprising a mesh fabric having a warp direction and a weft direction extending perpendicular thereto, and having warp yarns extending along the warp direction and weft yarns extending along the weft direction, wherein the fabric is designed with cut, open edges. Background Art

[0002] Among the bandage materials consisting of mesh fabric, a distinction is essentially made between bandage gauze and packing bandages.

[0003] The packing bandages are designed according to DIN EN 14079 as continuous strips of varying widths with woven edges.

[0004] In contrast thereto, bandage gauze is usually woven into a plain weave, wherein the bandage gauze is then cut from the weave so that an open woven edge is produced.

[0005] The bandage gauze or mesh cloth is then folded into a compressed gauze, and the bandage gauze is folded in a zigzag shape or rolled up on a roll for use. In addition, it can also be provided that the bandage gauze is used as a swab in a spirally wound mode.

[0006] The terms bandage gauze and mesh should be used interchangeably hereinafter. Thus, a bandage material having an open woven edge is a bandage gauze or mesh.

[0007] The bandage gauze according to the invention can be designed as a 17-count bandage gauze or a 13-count bandage gauze according to DIN EN 14079. However, in principle, other counts according to DIN EN 14079 are also conceivable according to the invention. The count is understood here to mean the number of threads per cm. 2 The count and thus the type of bandage gauze is defined.

[0008] Such bandage materials have been known in the art for many years.

[0009] In this case, the bandage gauze or mesh is made of cotton in accordance with DIN EN 14079. Cotton is a natural product which is subject to large price fluctuations and fluctuations in quality.

[0010] Alternately, it has been considered that, instead of being a woven material, the bandage gauze is manufactured as a nonwoven or nonwoven fabric. However, some users are afraid to switch to a nonwoven material and wish to continue to use a woven material as a bandage material. Summary of the invention

[0011] Starting from the known prior art, namely bandage materials made of cotton with open edges, such as bandage gauze or mesh, the object of the present invention is to provide a bandage material which reduces the dependence on natural cotton resources and the fluctuating cotton costs associated therewith.

[0012] The invention achieves this object by a bandage material having the features of claim 1 , namely a bandage material in which the warp threads and / or the weft threads contain polyester threads and / or polyester blend threads.

[0013] Warp threads are here understood to be threads extending in the machine direction, wherein weft threads are threads extending transversely to the machine direction. This is a common terminology correspondence in weaving technology.

[0014] It can be provided that the weft threads are preferably made of polyester threads or polyester blends, wherein polyester threads are particularly preferred. The use of polyester in the weft threads is particularly advantageous compared to the use in the warp threads, since the warp beams can be used as usual during weaving (100% cotton) and thus no changes are required in the warp beam production. Instead, only the weft threads are replaced on the weaving machine. This results in a slight change in production. It is also advantageous that the polyester threads are not so rough and can therefore be easily ejected.

[0015] Finally, in the finished web, the warp yarns are tighter than the weft yarns. Because the weft yarns are "looser" in the "loop," the fabric is more elastic in the weft direction than in the warp direction.

[0016] Alternatively, it is also possible to specify that cotton or viscose can be used alternately with polyester yarn. Here, it is preferably specified according to the present invention that at least 30%, in particular at least 50% and in particular at least 70% of the weft yarns are polyester yarns or polyester blends.

[0017] The polyester blended yarn can be provided as a yarn in which cotton and / or viscose fibers and / or another material are spun together with the polyester to form a yarn. Alternatively, the bicomponent fiber can also be provided as a polyester blended yarn, which has, for example, a sheath-core arrangement in which the cotton sheath has a polyester core. Particularly preferably, monofilaments are used as polyester fibers, which are produced by polycondensation, in particular from polyethylene terephthalate (PET). For example, monofilaments also have the advantage of low cost compared to bicomponent yarns.

[0018] However, it is preferably provided that the weft thread consists completely or partially of polyester. It is particularly preferred that the weft thread consists completely of polyester.

[0019] Possible and preferred polyester types include polyethylene terephthalate, polylactic acid, polytrimethylene terephthalate, polyethylene naphthalate, polycarbonates, polyester carbonates, polyarylates and unsaturated polyester resins. Polyethylene terephthalate is particularly preferred.

[0020] By providing polyester, the values ​​for the tensile strength of the bandage material specified in the standard DIN EN 14079 can be positively increased compared to the values ​​for cotton. At the same time, the remaining desired and / or standard-required values, such as the visual appearance of the material, in particular whiteness, count, fluorescence, drop duration, remain unchanged. This also applies to the specifications in DIN EN 14079 regarding acidic and alkaline substances, surfactants, ethers and water-soluble substances, starch and dextrin, as well as drying loss, sulfates and extractable dyes, which preferably continue to correspond to the values ​​specified in the standard.

[0021] The weight per unit area prescribed by standard DIN EN 14079 can be designed in accordance with the standard or can be reduced as long as the tensile strength in the warp direction and in the weft direction prescribed by the standard is achieved.

[0022] The tensile strength is particularly important here for bandages or meshes, because the tensile strength is not provided and obtained by the woven edges, for example in a wadding bandage, but must be provided in particular by the weft threads. The tensile strength is particularly important so that the bandage does not remain in or on the wound.

[0023] In particular, also in order to maintain the absorption capacity to liquids, in particular wound fluids, but also to saline solutions or water, it can be provided according to a preferred embodiment that the warp threads consist of cotton and / or cotton blended yarns. According to an alternative design, it can also be provided that the warp threads not only comprise cotton yarns but also viscose yarns.

[0024] Cotton blends are bicomponent fibers with a cotton sheath or fibers in which cotton filaments are spun into yarn with other filaments. Cotton yarns are particularly preferably used as warp threads. This provides the properties known from previous cotton bandage materials, such as good water absorption, but also provides the required weight per unit area and the required tensile strength according to DIN EN 14079.

[0025] It can be particularly preferably provided that the fabric is woven in the usual manner as a plain weave. In principle, however, twill weaves or other fabric types, such as lehenges or panama weaves, are also conceivable. The use of a plain weave ensures that the fabric and thus the bandage material also have an appearance that is generally familiar and desirable to the user. In particular, an appearance and feel that is known and familiar to the user compared to nonwoven materials is provided in all weave types.

[0026] It is particularly preferred that the polyester yarn and / or polyester blended yarn used as warp and / or weft yarn do not cross, but always extend substantially parallel to each other.Substantially parallel should preferably be understood here that the polyester yarn and / or polyester blended yarn are only used as weft or warp yarn, but are not used in two transverse to the yarn systems extending to each other.

[0027] It can be provided that the fabric has a tensile strength in the warp direction (machine direction - MD) of >50 N / 50 mm, in particular >55 N / 50 mm, in particular >60 N / 50 mm in the dry state in the case of a bandage gauze with a yarn count of 17. The method for determining the tensile strength is given in DIN EN 14079. This value is >35 N / 50 mm in the case of a bandage gauze with a yarn count of 13. The tensile strength thus exceeds the requirements of the standard DIN EN 14079 in every case.

[0028] In particular, in the weft direction (transverse direction) (also referred to as Cross Direction in relation to Machine Direction - MD), fabrics having a tensile strength in the weft direction of >30 N / 50 mm, in particular >70 N / 50 mm, in particular >100 N / 50 mm, exceed the requirements of the standards by several times and thus offer significant advantages. This value applies to bandage gauze with a yarn count of 17. In the case of bandage gauze with a yarn count of 13, this value is >20 N / 50 mm. Here, the warp direction corresponds to the machine direction and the weft direction corresponds to the transverse direction.

[0029] Furthermore, the fabric also has very good tensile strength in the wet state. The tensile strength in the wet state, which is not covered and reflected in the standard DIN EN 14079, is particularly important because it allows the behavior of the bandage material in the case of use to be described. In order to reflect the "wet state", the test specimen is placed in a 0.05% Tergitol solution until it is completely wetted, then removed from the solution and the excess liquid is removed. The tensile strength is then tested in accordance with the standard DIN EN 14079.

[0030] Here, the tensile strength in the machine direction, i.e. the warp direction, is preferably >50 N / 50 mm, in particular >55 N / 50 mm and in particular >60 N / 50 mm. The tensile strength in the transverse direction relative to the machine direction, i.e. the weft direction, is in particular >30 N / 50 mm, in particular bei>70 N / 50 mm and in particular >100 N / 50 mm. This value applies to a bandage gauze with a yarn count of 17. The values ​​measured in the dry state apply analogously to a bandage gauze with a yarn count of 13. In principle, other counts are also conceivable, for example a count of 20. This count corresponds to the number of warp and weft threads per 100 mm here. The following values ​​result here:

[0031]

[0032] In particular, the tensile strength of the fabric according to the invention does not vary significantly, regardless of whether the fabric is present in a dry or wet state. The difference is in particular less than 30%, in particular less than 20% and in particular 5-15%.

[0033] Furthermore, it is preferably provided that in the case of a bandage gauze having a yarn count of 17, the fabric has a gloss of at least 23 g / m 2 In 13-count bandage gauze, the unit area weight is at least 14 g / m 2 This results in a substantially uniform weight per unit area, which is also provided in conventional products used as bandage gauze, for example. This therefore leaves the user with an unchanged feeling of control compared to the known case.

[0034] Particularly preferably, a water absorption of at least 5 g / g, in particular at least 5.2 g / g and in particular at least 5.4 g / g is also achieved. The test for water absorption is carried out as follows:

[0035] Test equipment /

[0036] Auxiliary tools: - Punch: 100x100±0.25mm

[0037] (Inspect the punch for damage or the like before use)

[0038] -Wire blue 110x110mm,

[0039] Made of wire mesh bottom 1.4401, mesh size 0.8 mm,

[0040] Wire thickness 0.5mm

[0041] - Plates consisting of stainless steel 100 x 100 x 2 mm,

[0042] 250±2.5g(see Figure 1 )

[0043] -Precision scale, dd=0.01g

[0044] -Flat plate

[0045] - Minute and second stopwatch

[0046] Reagents / Indicators: -None

[0047] Chemicals / Buffers / Media: - Desalted water

[0048] Sample preparation:

[0049] -Sample elimination

[0050] The sample material is conditioned in a test environment at 23±2° C. and 50±4% rH for at least 24 hours prior to the measurement in such a way that air can circulate freely.

[0051] Inspection method:

[0052] Unless otherwise requested, n = 5 tests were performed.

[0053] - Determine the dry weight of the sample (= M1) by weighing to the nearest 0.01 g

[0054] Notice : If a single sample weighs less than 1 g, stack multiple samples into a sample pile weighing at least 1 g.

[0055] -Put the sample in a wire basket and cover it with a stainless steel plate

[0056] Notice : For samples from medical pads, etc., insert the specimen into the wire basket with the film side facing the wire mesh.

[0057] - Place the wire basket with the sample and the stainless steel plate into the pan filled with demineralized water; the surface of the sample must be approximately 20 mm below the water level.

[0058] Notice : Avoid the formation of bubbles under the sample or in the sample pile due to introducing the sample into the water at a certain angle.

[0059] - After 30 seconds, lift the stainless steel plate and rotate it 45° onto the wire basket

[0060] gives:

[0061] - Water absorption A is in [g / g], rounded to one decimal place

[0062]

[0063] M1 = sample weight, dry in g

[0064] M2 = sample weight, wet in g

[0065] Notice : In special cases, the duration of action can be increased or decreased, but not less than 10s

[0066] - After a further 30 seconds, remove the wire basket with the sample from the water and drip water through one corner for 120 ± 3 seconds.

[0067] - Weigh the sample again with an accuracy of 0.01 g (= M2)

[0068] Evaluate:

[0069] -Relative water absorption Arel is in [%], rounded to one decimal place

[0070]

[0071] M1 = weight of sample, dry in g

[0072] M2 = weight of sample, wet in g

[0073] If you want:

[0074] -Water absorption per unit area AA [g / cm 2 ] as the unit, rounded to an integer

[0075]

[0076] M1 = weight of sample, dry in g

[0077] M2 = weight of sample, wet in g

[0078] - Number of trials, mean, minimum and maximum values, standard deviation

[0079] Reference standard: - Method based on DIN 53923:1978-01

[0080] Deviations: Slightly smaller wire basket, two-part immersion time with additional sample loading at the beginning, water temperature corresponding to room temperature

[0081] In particular, the requirements in wound treatment can be taken into account by means of the water absorption determined in this way.

[0082] Particularly preferably, the bandage material may be a mesh or a bandage gauze material. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] The following figures show corresponding bandage materials which are designed as bandage gauze or mesh material.

[0084] In the attached figure:

[0085] Figure 1 A first fabric for making a bandage gauze is shown,

[0086] Figure 2 Schematically showing the Figure 1 The structure of the bandage gauze having warp yarns 14 and weft yarns 16, and

[0087] Figure 3 Alternative fabrics are shown. DETAILED DESCRIPTION

[0088] exist Figure 1 , the fabric of the bandage gauze can be seen, which has weft threads and warp threads. The bandage gauze is cut from a large fabric to the desired width and then produced into corresponding products, such as swabs and compressed gauze. It can be easily seen here that in addition to the fabric 10 in the form of a plain weave, an open edge 12 is provided, at which the fabric 10 is also partially cut through the yarn path. In contrast, the bandage material in the form of a wadding bandage has a closed woven edge and is produced directly in the corresponding width.

[0089] according to Figure 1 The bandage material of WO 2014 / 052638 is thus composed of a net-like fabric 10 , wherein the fabric is designed with cut open edges 12 , wherein the warp threads and / or weft threads contain polyester threads and / or polyester blend threads.

[0090] Figure 2 The structure of warp yarn 14 and weft yarn 16 is shown here. The weft yarn is preferably made of 100% polyester, while the warp yarn is made of 100% cotton. In addition to this configuration of a plain weave fabric in which the yarns are interwoven with each other, it can also be provided that the warp yarn is replaced by a blended yarn consisting of cotton and polyester, for example 60% cotton and 40% polyester. It is also possible to use the following configuration, in which the weft yarn is made of a blended yarn consisting of cotton and polyester, for example 50% cotton and polyester respectively. The blended yarn can be made of filaments here, in which filaments consisting of cotton and polyester or consisting of cotton and viscose fibers can be provided, which are spun into yarns together. Alternatively, bicomponent fibers are also possible.

[0091] It can be provided that both the warp and the weft are made of polyester yarns or polyester blended yarns. In the polyester blended yarns, both cotton and viscose fibers can preferably be arranged as two components.

[0092] Figure 3Now, another possible configuration is shown, in which the warp threads 14 are cotton threads. Alternatively, blended threads of cotton and viscose, viscose or polyester, and blended threads with polyester can also be used as warp threads. The weft threads 16a, b are alternately polyester threads 16a and viscose threads 16b, each of which is 100% made of the corresponding material.

[0093] By using polyester, the values ​​of DIN EN 14079 with respect to density and water absorption capacity as well as other values ​​of this standard can be met. At the same time, an improved or constant tensile strength can be achieved. In particular, polyester increases the tensile strength under damp or wet conditions, which are close to the conditions in which bandage materials are used.

[0094] The table below shows an analysis of a 100% cotton fabric in plain weave form and a fabric consisting of cotton warp and polyester weft. Both materials are bandage materials with open, cut weave edges.

[0095] For the tests with the results shown in the table, monofilaments produced by polycondensation of 100% polyester (polyethylene terephthalate) were used, which were available from the manufacturer "Jiujiang Xin Cheng Textile Co. Ltd., China" under the name "40S polyester yarn".

[0096] It can be directly inferred from the table that the tensile strength is improved, especially in the wet state.

[0097]

Claims

1. A bandage material comprising a mesh fabric (10), the mesh fabric having a warp direction and a weft direction extending perpendicular thereto, and the mesh fabric having warp yarns (14) extending along the warp direction and weft yarns (16) extending along the weft direction, wherein: The fabric (10) is designed with cut, open edges (12) and is characterized in that the warp threads (14) and / or the weft threads (16) contain polyester yarns and / or polyester blended yarns.

2. The bandage material according to claim 1, characterized in that The weft yarn (16) is a polyester yarn and / or a polyester blended yarn and is in particular a polyester yarn.

3. The bandage material according to claim 1 or 2, characterized in that: The polyester yarn is a monofilament which is produced by polycondensation, in particular from polyethylene terephthalate (PET).

4. Bandage material according to one or more of the preceding claims, characterized in that The warp yarn (14) is cotton yarn and / or cotton blended yarn.

5. Bandage material according to one or more of the preceding claims, characterized in that The fabric (10) is woven into a plain weave.

6. Bandage material according to one or more of the preceding claims, characterized in that The polyester yarn and / or polyester blended yarn is used as a weft yarn or a warp yarn, and in particular, the weft yarn includes a polyester yarn and / or a polyester blended yarn.

7. Bandage material according to one or more of the preceding claims, characterized in that The fabric (10) has a tensile strength in the warp direction of >50 N / 50 mm, in particular >55 N / 50 mm and especially >60 N / 50 mm in the dry state.

8. Bandage material according to one or more of the preceding claims, characterized in that The fabric (10) has a tensile strength in the weft direction of >30 N / 50 mm, in particular >70 N / 50 mm and especially >100 N / 50 mm in the dry state.

9. Bandage material according to one or more of the preceding claims, characterized in that The fabric (10) has a tensile strength in the warp direction of >50 N / 50 mm, in particular >55 N / 50 mm and especially >60 N / 50 mm in the wet state.

10. Bandage material according to one or more of the preceding claims, characterized in that The fabric (10) has a tensile strength in the wet state of >30 N / 50 mm, in particular >70 N / 50 mm and especially >100 N / 50 mm in the weft direction.

11. Bandage material according to one or more of the preceding claims, characterized in that The fabric (10) has a thickness of at least 23 g / m 2 Weight per unit area.

12. Bandage material according to one or more of the preceding claims, characterized in that The textile (10) has a water absorption of at least 5 g / g, in particular at least 5.2 g / g and especially at least 5.4 g / g.

13. Bandage material according to one or more of the preceding claims, characterized in that The bandage material is mesh or bandage gauze.

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