Dressing material comprising a mesh-like fabric

Abstract

The invention relates to dressing material comprising a mesh-like fabric (10) with a warp direction and a perpendicular weft direction, and with warp threads (14) extending in the warp direction and weft threads (16) extending in the weft direction, the fabric (10) having cut, open edges (12), characterized in that the warp threads (14) and / or the weft threads (16) contain polyester threads and / or polyester blend threads.

Description

[0001] Title: Dressing material comprising a grid-like

[0002] tissue

[0003] Description

[0004] The invention relates to a dressing material comprising a grid-like fabric with a warp direction and a weft direction running perpendicular thereto, as well as with warp threads running in the warp direction and weft threads running in the weft direction, wherein the fabric is formed with cut, open edges.

[0005] When it comes to dressing materials made of mesh-like fabrics, a distinction is essentially made between gauze and tamponade bandages. Tamponade bandages according to DIN EN 14079 are designed in the form of continuous bands of varying widths with woven edges.

[0006] In contrast, gauze is usually woven in a plain weave, with the gauze then cut from the fabric to create open selvedges.

[0007] The gauze or bandage is then folded into a compress or zigzag-folded gauze, or it is packaged on a roll for use. The gauze can also be rolled up and used as a swab.

[0008] The terms "gauze" and "bandage gauze" will be used interchangeably below. Bandage materials with open selvedges are therefore referred to as "gauze" or "bandage gauze."

[0009] The inventive gauze can be designed as a 17 thread gauze or as a gauze with 13 threads according to DIN EN 14079. In principle, however, other thread counts according to DIN EN 14079 are also conceivable. The thread count here is the number of threads per cm 2 understood and thereby defines the type of gauze.

[0010] Such dressing materials have been known in the state of the art for many years. Gauze is made from cotton according to DIN EN 14079. Cotton is a natural product subject to significant price and quality fluctuations.

[0011] Alternatively, consideration has been given to producing gauze as nonwoven or nonwoven material instead of woven. However, some users are concerned about switching to nonwoven materials and would prefer to use more woven materials as dressing materials.

[0012] Based on the known state of the art, namely dressing materials with open edges, i.e. gauze or bandage, made of cotton, the object of the invention is to provide a dressing material that is less dependent on naturally occurring cotton resources and the associated fluctuating costs for cotton.

[0013] The invention solves this problem by a dressing material having the features of claim 1, namely a dressing material in which the warp threads and / or the weft threads contain polyester threads and / or polyester blend threads.

[0014] Warp threads are understood to be the threads that run in the machine direction, while weft threads are the threads that run transversely to this direction. This is the usual assignment of the terms in weaving technology. It can preferably be provided that the weft threads are preferably made of polyester threads or polyester blend threads, with polyester threads being particularly preferred. The use of polyester for the weft threads is particularly advantageous compared to the use of polyester for the warp threads because the warp beam can be used as usual during weaving (100% cotton), thus eliminating the need for any adjustments to warp beam production. Instead, only the weft thread is exchanged on the weaving machine. This allows for easy changeover in production. Another advantage is that the polyester thread is less rough and can therefore be wefted smoothly.

[0015] Ultimately, the warp thread in the finished gauze is more taut than the weft thread. Because the weft thread lies "loosely in loops," the fabric is more elastic in the weft direction than in the warp direction.

[0016] Alternatively, it can also be provided that cotton or viscose can be alternated with polyester threads. According to the invention, it is preferably provided that at least 30%, in particular at least 50%, and in particular at least 70% of the weft threads are polyester threads or polyester blend threads.

[0017] Polyester blend threads can include threads in which cotton and / or viscose and / or other materials are spun together with polyester. Alternatively, bicomponent fibers can also be used as polyester blend threads, for example, having a sheath-core arrangement in which a cotton sheath has a polyester core. Particularly preferred as polyester threads is a monofilament produced by polycondensation, in particular from polyethylene terephthalate (PET). The advantage of a monofilament thread is its low cost, e.g., compared to a bicomponent thread.

[0018] However, it is preferred that the weft threads consist entirely or partially of polyester. It is particularly preferred that they be made entirely of polyester.

[0019] Possible and preferred polyester types include polybutylene terephthalate, polylactide, polytrimethylene terephthalate, polyethylene naphthalate, polycarbonate, polyester carbonate, polyarylates, and unsaturated polyester resin. Polyethylene terephthalate is particularly preferred.

[0020] By using polyester, the values ​​specified in the DIN EN 14079 standard for the tear resistance of the dressing material can be increased significantly compared to the values ​​for cotton. At the same time, the other desired and / or standard-required values, such as the visual appearance, in particular the whiteness, the thread count, the fluorescence, and the settling time of the material, remain the same. This also applies to the information in the DIN EN 14079 standard for acidic and alkaline substances, surfactants, ether- and water-soluble substances, starch and dextrin, as well as loss on drying, sulfate ash, and extractables.

[0021] Dyes that should preferably continue to comply with the values ​​specified in the standard.

[0022] The basis weight specified by the DIN EN 14079 standard can be developed according to the standard or reduced, provided that the tear resistance in the warp and weft directions specified by the standard is achieved.

[0023] Tear resistance is particularly important for gauze or bandages, as the tear resistance is not provided and maintained by the woven edges as with tamponade bandages, but rather must be provided primarily by the weft threads. Tear resistance is particularly important to ensure that no residue of the gauze remains in or on a wound.

[0024] In particular, to ensure that the absorbency for fluids, especially wound fluids, but also saline solution or water, is maintained, according to a preferred embodiment, the warp threads can be made of cotton and / or cotton blend threads. According to an alternative embodiment, the warp threads can also comprise both cotton and viscose threads.

[0025] Cotton blend threads are either bico fibers with a cotton sheath, or fibers in which cotton filaments are spun with other filaments to form a single thread. Cotton threads are particularly preferred for warp threads. These offer the properties familiar from conventional cotton dressing materials, such as good water absorption, as well as the required basis weight and tear strength, as required by DIN EN 14079.

[0026] Particularly preferably, the fabric may be woven in the usual manner in plain weave.

[0027] In principle, however, a twill weave or another weave type, such as a leno weave or a panama weave, is also conceivable. Using a plain weave ensures that the fabric, and thus the bandage material, has the usual appearance that users find familiar and desired. In particular, all weave types provide a familiar and comfortable look and feel for users, unlike nonwoven materials.

[0028] It is particularly preferred if the polyester threads and / or polyester blend threads used as warp and / or weft threads do not cross each other, but always run essentially parallel to each other. Essentially parallel should preferably be understood to mean that the polyester threads and / or polyester blend threads are used only as either weft or warp threads, but not in two thread systems running transversely to each other.

[0029] In this case, the fabric of a gauze with a thread count of 17 threads can be specified to have 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 when dry. The method for determining tensile strength is specified in DIN EN 14079. The values ​​for a gauze with a thread count of 13 threads are > 35 N / 50 mm. Thus, the tensile strength definitely exceeds that required by DIN EN 14079.

[0030] Particularly in the weft direction (cross direction) (also referred to as cross direction - CD in relation to machine direction - MD), the fabric, with a tensile strength in the weft direction of > 30 N / 50 mm, especially > 70 N / 50 mm, and especially > 100 N / 50 mm, far exceeds the requirements of the standard and thus offers significant advantages. These values ​​apply to a gauze with a thread count of 17 threads. For a gauze with a thread count of 13 threads, the value is > 20 N / 50 mm. The warp direction corresponds to the machine direction, and the weft direction to the cross direction.

[0031] In addition, the fabric also exhibits very good tear strength when wet. Tear strength when wet, which is not covered or specified by the DIN EN 14079 standard, is particularly important because it provides information about the behavior of the dressing material in use. To simulate a "wet state," the test samples are placed in a 0.05% Tergitol solution until completely wetted, then removed from the solution, and the excess liquid is wiped off. The tear strength test is then carried out according to the DIN EN 14079 standard. In this case, the tear strength in the machine direction, i.e., the warp direction, is preferably > 50 N / 50 mm, especially > 55 N / 50 mm, and especially > 60 N / 50 mm. In the transverse direction, i.e., the weft direction, the tear strength is particularly > 30 N / 50 mm, especially > 70 N / 50 mm, and especially > 100 N / 50 mm. The values ​​apply to gauze with a thread count of 17 threads.

[0032] For gauze with a thread count of 13 threads, the values ​​measured in the dry state apply analogously. Other thread counts are also conceivable, for example, a thread count of 20. The thread count corresponds to the number of warp and weft threads per 100 mm. This results in the following values:

[0033] In particular, the tear strength of the fabric according to the invention does not vary significantly, regardless of whether the fabric is in the dry or wet state. The difference is in particular less than 30%, in particular less than 20%, and in particular between 5 and 15%.

[0034] Furthermore, it is preferably provided that the fabric has a basis weight of at least 23 g / m 2 for a gauze with a thread count of 17 threads. For a 13-thread gauze, the basis weight is at least 14 g / m 2This essentially achieves a basis weight similar to that provided by conventional products used as gauze.

[0035] This keeps the feeling of handling constant for the user compared to what is known.

[0036] It is particularly preferred if the water absorption is at least 5 g / g, especially at least 5.2 g / g, and especially at least 5.4 g / g. The water absorption test is carried out as follows:

[0037] Testing equipment /

[0038] Tools: - Punching knife: 100 x 100 ± 0.25 mm

[0039] (Check the punching knife for damage or similar before use)

[0040] - Wire basket 110 x 110 mm, made of wire sieve base 1.4401, mesh size 0.8 mm, wire thickness 0.5 mm

[0041] - Stainless steel plate 100 x 100 x 2 mm, 250 ± 2.5 g (see Fig. 1)

[0042] - Precision balance, dd = 0.01 g

[0043] - flat bowl

[0044] - Stopwatch with seconds division

[0045] Reagents / Indicators : - none

[0046] Chemicals / Buffer / Media: Demin. Water Sample Preparation:

[0047] Punching out samples

[0048] Before measurement, the sample material must be laid out in a test atmosphere of 23 ± 2 °C and 50 ± 4 %rH for at least 24 hours so that air has free access.

[0049] Test procedure: unless otherwise required, perform n = 5 tests

[0050] - Determine the dry weight (= ml) of the sample by weighing to the nearest 0.01 g

[0051] Note: If an individual sample weighs less than 1 g, stack several samples to form a sample stack weighing at least 1 g.

[0052] - Place the sample in the wire basket and cover with the stainless steel plate

[0053] Note: for samples from e.g. medical documents, place the test specimen in the wire basket with the film side towards the sieve.

[0054] - Place the wire basket containing the sample and the stainless steel plate in a bowl filled with demineralized water; the surface of the sample must be approximately 20 mm below the water level

[0055] Note: Avoid the formation of air bubbles under the sample or in the sample stack, e.g. by inserting the sample into the water at an angle.

[0056] - after 30 s, lift the stainless steel plate and place it on the wire basket, rotated by 45°:

[0057] - Water absorption A in [g / g], rounded to one decimal

[0058] Ml = weight of test specimen, dry in g

[0059] M2 = Weight of test specimen, wet in g

[0060] Note: in special cases, the exposure time can be increased or decreased, but not less than 10 s

[0061] - after another 30 s, remove the wire basket with the sample from the water and let it drip over one corner for 120 ± 3 s

[0062] Weigh the sample again to the nearest 0.01 g (= M2)

[0063] Evaluation:

[0064] - Water absorption relative A rei in [%], rounded to one decimal

[0065] Ml = weight of test specimen, dry in g

[0066] M2 = Weight of test specimen, wet in g if desired:

[0067] - Water absorption per area AA.in [g / cm 2 ], rounded to whole numbers

[0068] Ml = weight of test specimen, dry in g

[0069] M2 = Weight of test specimen, wet in g - Number of tests, mean, minimum and maximum values, standard deviation

[0070] Standard reference: - Method based on DIN 53923:1978-01

[0071] Deviations: slightly smaller wire basket, 2-part immersion time with additional load on the sample at the beginning, water temperature corresponds to room temperature

[0072] In particular, the water absorption determined in this way can be used to meet the requirements of wound treatment.

[0073] Particularly preferably, the dressing material may be a gauze or a bandage material.

[0074] The following figures show a corresponding dressing material that is designed as a gauze or bandage material.

[0075] Showing:

[0076] Figure 1 shows a first fabric for the production of gauze,

[0077] Figure 2 schematically shows the structure of a gauze according to

[0078] Figure 1 with the warp threads 14 and the weft threads 16 and

[0079] Figure 3 shows an alternative fabric. Figure 1 shows the fabric of a gauze bandage, which has weft threads and warp threads. The gauze bandage is cut from a large fabric in the desired width and then made into the corresponding products, such as swabs and compresses. In addition to the plain weave fabric 10, it is clearly visible that open edges 12 are provided, where the fabric 10 is partially cut through the thread lines. In contrast, a bandage material in the form of a tamponade bandage has closed selvedges, and the bandage material is manufactured directly in the appropriate width.

[0080] The dressing material according to Figure 1 thus consists of a grid-like fabric 10, wherein the fabric is formed with cut open edges 12, wherein the warp threads and / or the weft threads contain polyester threads and / or polyester blend threads.

[0081] Figure 2 illustrates the structure, in which the warp threads 14 and the weft threads 16 are identified here. The weft threads are preferably made of 100% polyester, while the warp threads consist of 100% cotton. In addition to this embodiment, which is a plain weave in which the threads are woven together, it can also be provided that the warp threads are replaced by a blended thread of cotton and polyester, for example 60% cotton and 40% polyester. It is also possible to use a configuration in which the weft threads consist of blended threads of cotton and polyester, for example 50% each. The blended threads can consist of filaments, whereby filaments of cotton and polyester or cotton and viscose can be provided, which are spun together to form a thread. Alternatively, bicomponent fibers are also possible.

[0082] It can also be provided that both the warp and weft threads consist of polyester threads or polyester blend threads. In the case of polyester blend threads, either cotton or viscose can be used as the second component.

[0083] Figure 3 shows another possible design, where the warp threads 14 are cotton threads. Alternatively, blended threads of cotton and viscose, viscose threads, or polyester threads, as well as blended threads with polyester, can be used as warp threads. The weft threads 16a and b alternate between polyester threads 16a and viscose threads 16b, each consisting 100% of the respective materials.

[0084] By using polyester, the values ​​of the DIN EN 14079 standard regarding density and water absorption capacity can be met, as well as other values ​​of the standard. At the same time, improved or constant tear resistance can be achieved. In particular, the polyester improves tear resistance in moist or wet conditions, which is similar to the intended use of the bandage material.

[0085] The following table presents an analysis of both a 100% cotton plain weave fabric and a fabric consisting of cotton for the warp threads and polyester for the weft threads. Both materials are bandage materials with open, cut selvedges.

[0086] For the tests, the results of which are shown in the table, a monofilament made of 100% polyester (polyethylene terephthalate) produced by polycondensation was used, available under the

[0087] Named "40S polyester yarn" from the manufacturer "Jiujiang Xin Cheng Textile Co. Ltd., China." The thread has a tensile strength of 14.76 tex + / - 2.5%. The table immediately shows that the tensile strength is improved, especially in wet conditions.

[0088]

[0089] 17fd = thread count 17

[0090] MD = Machine direction

[0091] CD = Cross Direction (perpendicular to the machine direction)

Claims

Patent claims Dressing material comprising a grid-like fabric (10) with a warp direction and a weft direction running perpendicular thereto, as well as with warp threads (14) running in the warp direction and weft threads (16) running in the weft direction, wherein the fabric (10) is formed with cut, open edges (12), characterized in that the warp threads (14) and / or the weft threads (16) contain polyester threads and / or polyester blend threads. Dressing material according to claim 1, characterized in that the weft threads (16) are polyester threads and / or polyester blend threads, and in particular are polyester threads. Dressing material according to claim 1 or 2, characterized in that the polyester threads are monofilaments produced by polycondensation, in particular from polyethylene terephthalate (PET). Dressing material according to one or more of the preceding claims, characterized in that the warp threads (14) are cotton threads and / or cotton blend threads. Bandage material according to one or more of the preceding claims, characterized in that the fabric (10) is woven in a plain weave. Bandage material according to one or more of the preceding claims, characterized in that the polyester threads and / or polyester blend threads are used either as weft threads or as warp threads, and in particular the weft threads comprise polyester threads and / or polyester blend threads. Bandage material according to one or more of the preceding claims, characterized in that the fabric (10), in the dry state, has a tear strength in the warp direction of > 50 N / 50 mm, in particular > 55 N / 50 mm and in particular > 60 N / 50 mm. Bandage material according to one or more of the preceding claims, characterized in that the fabric (10), in the dry state, has a tear strength in the weft direction of > 30 N / 50 mm, in particular > 70 N / 50 mm and in particular > 100 N / 50 mm.Dressing material according to one or more of the preceding claims, characterized in that the fabric (10) in the wet state has a tear strength in the warp direction of > 50 N / 50 mm, in particular of > 55 N / 50 mm and in particular of > 60 N / 50 mm. Bandage material according to one or more of the preceding claims, characterized in that the fabric (10) in the wet state has a tear strength in the weft direction of > 30 N / 50 mm, in particular of > 70 N / 50 mm and in particular of > 100 N / 50 mm. Bandage material according to one or more of the preceding claims, characterized in that the fabric (10) has a basis weight of at least 23 g / m2. Bandage material according to one or more of the preceding claims, characterized in that the fabric (10) has a water absorption of at least 5 g / g, in particular of at least 5.2 g / g and in particular of at least 5.4 g / g. Bandage material according to one or more of the preceding claims, characterized in that it is a gauze or bandage gauze.

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