JP4574264B2 - Gauze and method for producing the same - Google Patents

Description

  The present invention relates to a gauze used for medical purposes.

  As a conventional gauze used for medical purposes, a cotton gauze which is a so-called pharmacopeia gauze composed of a large number of warps and wefts substantially perpendicular to the warps is often used. During surgery, the gauze is cut into an appropriate size and used, but the cotton gauze has a problem that there is a large amount of lint generation, and there is a risk that the lint generated may remain in the body. There's a problem.

  Further, in order to prevent the gauze used in the operation from being left in the patient's body after the operation, a surgical gauze incorporating an X-ray contrast yarn is used. Since the X-ray contrast yarn is woven into the gauze, the gauze is removed by checking the presence and position of the gauze left in the patient's body by X-ray photography after the operation. However, cotton gauze is inferior in form stability because it is a coarse woven fabric, and there is a fear that the X-ray contrast yarn woven from gauze may fall out during medical practice.

  As a solution to such a problem, Patent Document 1 discloses an attempt to prevent the X-ray contrast yarn from falling off by densely weaving the cotton yarn in the vicinity of the X-ray contrast yarn being woven. ing. However, since the cotton gauze, which is a coarse woven fabric composed of warps and wefts, is used in a portion other than the portion in which the X-ray contrast yarn is woven, the problem that yarn waste is frequently generated cannot be solved.

On the other hand, Patent Document 2 discloses a gauze in which an X-ray contrast yarn is sandwiched between a non-woven fabric and a non-woven fabric to reduce the generation of lint.
JP 2003-325573 A JP 2002-238934 A

  The present invention is a gauze that can also be used during surgery, and produces less lint and the like during cutting and use, and there is no change in form due to friction during use or friction during liquid absorption. An object of the present invention is to provide a gauze that is excellent in handleability and has excellent shape retention.

  The inventors of the present invention have reached the present invention as a result of intensive studies to achieve the above-mentioned problems.

That is, the present invention is fibers formed only by solvent-spun cellulose fiber sheet (However, sheet and woven or knitted fabric made of non-woven fabric is substantially laminated, woven fibers constituting the fibers and / or nonwoven constituting the nonwoven fabric Except for a woven / knitted composite nonwoven fabric sheet that is substantially entangled with fibers constituting the knitted fabric) , and the fiber sheet is integrated as a whole only by the entanglement of solvent-spun cellulose fibers. The X-ray contrast yarn is present in the fiber sheet, and the X-ray contrast yarn is fixed in the fiber sheet by the entanglement of solvent-spun cellulose fibers constituting the fiber sheet. The gauze is a gist.

Further, the present invention, the fibers on the fibrous web only SOLVENTS spun cellulose fibers are deposited, by arranging the X-ray opaque filament at appropriate intervals, formed by further only SOLVENTS spun cellulose fibers is deposited thereon laminate depositing the web (excluding. those obtained by laminating a woven or knitted fabric and non-woven fabric), in which the gist of the method for manufacturing the gauze, characterized in that applying the hydroentanglement process.

  Hereinafter, the present invention will be described in detail.

Fiber sheet of the present invention is constituted only by Solvent-spun cellulose fibers. The solvent-spun cellulose fiber is fundamentally different from the conventional viscose rayon and copper ammonia rayon (cupra rayon) in the production method, and the performance of the obtained fiber is also different. That is, viscose rayon or the like is obtained by chemically changing a cellulose raw material and spinning a stock solution in which the cellulose raw material is dispersed and dissolved, whereas solvent-spun cellulose fiber is obtained by chemically converting a cellulose raw material. Without change, it is obtained by spinning a stock solution dissolved in a special organic solvent or a chip obtained by drying this stock solution. This is also called a cellulose fiber produced by a solvent method, and has high crystallinity and high orientation, and has a high initial Young's modulus and high strength when wet. For example, it is sold under the trademark “Lenzing Lyocell” from Lenzing AG (Austria). In the present invention, all of the fibers constituting the fiber sheet are made of solvent-proof cellulose fibers .

  The single yarn fineness of the fibers constituting the fiber sheet in the present invention is preferably in the range of 0.9 to 3.3 dtex, more preferably 1.3 to 2.2 dtex. If it is less than 0.9 dtex, the card passing property tends to be inferior in card passing properties. On the other hand, if it exceeds 3.3 dtex, the entanglement between fibers is less likely to be strong, and at the entanglement point. The degree of confounding tends to decrease.

  The fiber length of the fiber is preferably a short fiber in the range of 25 to 80 mm, and more preferably 30 to 60 mm. If it is less than 25 mm or exceeds 80 mm, the card passing property tends to be inferior in the card process for producing the fiber web.

The fiber sheet in the present invention is integrated as a whole only by the entanglement of solvent-spun cellulose fibers that are constituent fibers of the fiber sheet. Further, an X-ray contrast yarn is present in the fiber sheet, and the X-ray contrast yarn is fixed in the fiber sheet by entanglement of solvent-spun cellulose fibers constituting the fiber sheet.

  In the gauze of the present invention, the X-ray contrast yarn is present in the fiber sheet. This is because the gauze according to the present invention can be detected by X-ray when forgetting to collect after use in surgery. As the X-ray contrast yarn to be used, any yarn that can be detected by X-rays can be used. For example, a trademark of “Micropaque” manufactured by Acordis Specialty Fibers Ltd. (Acordis Specialty Fibers Ltd.) is used. Things are available on the market. Moreover, the thread | yarn which consists of an X-ray sensitive fiber of Unexamined-Japanese-Patent No. 2002-266157 can also be used.

  The gauze of the present invention may be used after being cut into an appropriate size for use during surgery or the like. At that time, if an X-ray contrast yarn exists in a part of the cut gauze, it can be detected by X-rays. Therefore, if the above object can be achieved, the presence state of the X-ray contrast yarn in the fiber sheet is not particularly limited.

The basis weight of the gauze of the present invention, about 30 to 120 g / m ² is preferred. If the basis weight is less than 30 g / m ² , the liquid absorbency tends to be inferior, and the form retainability tends to be inferior. On the other hand, if it exceeds 120 g / m ² , the liquid absorption is improved, but it is disadvantageous in terms of cost.

  Next, the preferable manufacturing method of the gauze of this invention is demonstrated.

First, a fiber web that is Solvent-spun cellulose fibers is formed by deposition. As the fiber web, for example, a card web obtained by supplying solvent-spun cellulose fibers to a card machine is used. Next, the fibrous web is supported on a porous support such as a mesh. In the case of providing a hole in the fiber sheet, a mesh-like support made of a coarse woven fabric having a predetermined opening may be used. Next, on the fiber web, X-ray contrast yarns are arranged at appropriate intervals, and a fiber web on which solvent-spun cellulose fibers are mainly deposited is further deposited thereon to form a laminate.

The fiber web that is positioned vertically with the X-ray contrast yarn in between may be the same or different in basis weight as long as it is a fiber web made only of solvent-spun cellulose fibers. Good.

The basis weight of the fiber web positioned above and below may be appropriately selected in consideration of the basis weight of the gauze finally obtained, but is preferably about 10 to 100 g / m ² . The basis weights of the upper and lower fiber webs may be the same or different.

  It is preferable that the X-ray contrast yarns arranged on the fiber web are arranged at appropriate intervals in the flow direction (longitudinal direction) in production. As an appropriate space | interval, about 10-300 mm is good, for example. Moreover, when arranging, it may be meandering in a wavy pattern instead of being linear.

  Next, a hydroentanglement process is performed by applying a high-pressure water stream to the laminate formed by laminating the fiber web / X-ray contrast yarn / fiber web. By applying a high-pressure liquid flow, solvent-spun cellulose fibers are entangled as a whole to form a fiber sheet, and solvent-spun cellulose fibers are entangled with the X-ray contrast yarn, so that X-rays in the fiber sheet The contrast thread can be fixed.

  This high-pressure water flow is an injection device in which injection holes having a hole diameter of 0.05 to 2.0 mm are arranged in a row or a plurality of rows in the flow direction and the orthogonal direction (lateral direction) in production with an injection hole interval of 0.05 to 10 mm. And water is injected from the injection hole at a pressure of 1.5 to 40 MPa. The high pressure water stream then impinges on the fiber web and imparts kinetic energy to the constituent fibers. Due to this kinetic energy, the constituent fibers are entangled with each other. In addition, when a mesh-like support made of a coarse woven fabric is used, the constituent fibers move to the opening portion of the mesh-like support while being entangled, and there are no fibers at the location corresponding to the knuckle portion of the support. A gauze made of a fiber sheet having an open hole is formed.

  The opening of the mesh-like support can be determined based on the surface form of the gauze made of the fiber sheet to be obtained and the presence or absence of pores. For example, if it is a woven fabric of about 16 to 25 mesh, it is possible to obtain a gauze provided with pores while the surface of the obtained gauze is smooth. Moreover, when it is a woven fabric exceeding 25 meshes, an opening is hardly provided, and when it is a woven fabric exceeding 40 meshes in particular, a gauze having an extremely smooth surface and excellent drape properties can be obtained. What is necessary is just to select suitably according to the required performance etc. as a gauze. The mesh refers to the number of lines per inch. For example, a 25-mesh coarse woven fabric refers to one having 25 lines per inch.

  The gauze of the present invention can be obtained by cutting a fiber sheet having an X-ray contrast yarn obtained by hydroentanglement treatment into an appropriate size. Further, the gauze of the present invention may be cut into an appropriate size when used for surgery or the like.

Gauze of the present invention, only by the Solvent-spun cellulose fibers entangled, are those made of a fiber sheet formed integrally, solvent-spun cellulosic fibers, the fibers expand when wet (during liquid absorption), The degree of fiber entanglement becomes stronger. Therefore, the gauze of the present invention has excellent fiber sheet shape retention in a wet state when a body fluid or blood is absorbed during surgery, and the shape of the gauze during liquid absorption is similar to that of a conventional cotton gauze. It is difficult to maintain and not difficult to handle.

  The gauze according to the present invention is fixed by the entanglement of the solvent-spun cellulose fibers in the X-ray contrast yarn present in the gauze. It can play its role well.

  Moreover, since the fiber sheet holds the form by the entanglement of the constituent fibers, the generation of yarn waste can be reduced when the fiber is cut into an appropriate size.

Hereinafter, the present invention will be described specifically by way of examples. In addition, this invention is not limited only to these Examples. In the following Examples and Comparative Examples, each physical property value was determined as follows.
(1) Basis weight: Measured according to the description of JIS L 1906.

(2) Water absorption: Measured according to JIS-L-1907 Bayrec method. A sample having a length of 25 cm and a width of 2.5 cm was used.

(3) Form retention in a wet state (washing resistance test): A test was performed using a household electric washing machine with a centrifugal dehydrator. That is, water at a temperature of 40 ° C. was added to the water level line indicating the standard amount of water in the water tank of the test apparatus to obtain a washing liquid. A sample was added to the washing liquid so that the bath ratio was 1:30, and the operation was started. After the treatment for 5 minutes, the operation was stopped, the sample and the load cloth were dehydrated with a dehydrator, and then the washing liquid was replaced with fresh water of 30 ° C. or less, and rinsed at the same bath ratio for 2 minutes. After rinsing for 2 minutes, the operation was stopped, the sample and the load cloth were dehydrated, rinsed again for 2 minutes, dehydrated, and suspended without being affected by direct sunlight. This was 1 wash, 10 washes were repeated, and the morphology was observed.

Example 1
Solvent-spun cellulose fiber (single yarn fineness 1.7 decitex, fiber length 38 mm, registered trademark “Lentining Lyocell” manufactured by Lenzing) was opened with a random card to obtain a fiber web of about 15 g / m ² . An X-ray contrast yarn (“Micropake” 2750 denier / 50 filament manufactured by Accordis Specialty Fibers) is arranged on this fiber web in the flow direction (longitudinal direction) so as to be arranged linearly at intervals of 100 mm. A fiber web of about 15 g / m ² similar to that obtained above was deposited thereon to obtain a laminate.

  The obtained laminate was placed on a 100-mesh mesh-like support, and an injection pressure of 6 mm was used in which injection holes with a nozzle hole diameter of 0.1 mm were arranged in a row in the horizontal direction with a hole interval of 0.6 mm. .2 treatment at 9 MPa, and then inverted and treated twice from the opposite surface at an injection pressure of 9.8 MPa, and further inverted and placed on a 25 mesh mesh support, at an injection pressure of 9.8 MPa. It processed twice and the gauze which consists of a fiber sheet of this invention was obtained.

The obtained gauze was smooth and had pores. Moreover, the basis weight of the gauze was 33 g / m ² , and the water absorption was 98 mm / 10 minutes. As a result of evaluating the wettability of the form, even after 10 washes, there was almost no falling off of the constituent fibers or movement of the fibers compared to before the evaluation (before 1 washing), and the form by visual inspection. There was little change. Therefore, it was extremely excellent in form retention in a wet state.

Example 2
In Example 1, 70 parts by mass of barium sulfate fine particles having an average particle diameter of 0.7 μm as an X-ray contrast yarn and a relative viscosity (measured at a concentration of 1 g / dl using 98% sulfuric acid as a solvent at a temperature of 25 ° C.) of 2.5. Except for the fact that 4000 decitex / 40 filament yarn made of polyamide fiber obtained by mixing 30 parts by mass of nylon 6 with melt spinning and drawing was used, and arranged at intervals of 150 mm. In the same manner as in Example 1, a gauze made of the fiber sheet of the present invention was obtained.

The obtained gauze was smooth and had pores. Moreover, the basis weight of the gauze was 33 g / m ² , and the water absorption was 95 mm / 10 minutes. As a result of evaluating the wettability of the form, even after 10 washes, there was almost no falling off of the constituent fibers or movement of the fibers compared to before the evaluation (before 1 washing), and the form by visual inspection. There was little change. Therefore, it was extremely excellent in form retention in a wet state.

Comparative Example As a comparative example, evaluation was performed using a spunlace nonwoven fabric (weight per unit area: 25 g / m ² ) made of commercially available copper ammonia rayon fiber. The water absorption of the nonwoven fabric of the comparative example was 90 mm / 10 minutes. As a result of evaluating the wettability of the form, the entangled part of some of the constituent fibers was unwound in the form after one washing, and part of the constituent fibers was lost. Therefore, the shape change in a wet state was large, and the shape retention was inferior to that of the present invention.

Claims (2)

A fiber sheet composed only of solvent-spun cellulose fibers (however, a sheet made of a nonwoven fabric and a woven / knitted fabric are substantially laminated, and fibers constituting the nonwoven fabric and / or fibers constituting the nonwoven fabric and fibers constituting the woven / knitted fabric) Except for a woven / knitted composite nonwoven fabric sheet that is substantially entangled and integrated , and the fiber sheet is integrated as a whole only by entanglement of solvent-spun cellulose fibers. An x-ray contrast yarn is present in the gauze, and the x-ray contrast yarn is fixed in the fiber sheet by entanglement of solvent-spun cellulose fibers constituting the fiber sheet. In Solvent spun cellulose fibers only deposited to become the fiber web, it is arranged an X-ray opaque filament at appropriate intervals, were further its only SOLVENTS spun cellulose fibers on the deposit deposited to become fibrous web laminate A method for producing gauze, characterized in that hydroentanglement treatment is performed on an article (excluding a laminate of a nonwoven fabric and a woven or knitted fabric) .