JPS635100B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a base fabric for an orthopedic cast material using a synthetic resin. [Prior Art] Plaster casts are commonly used as orthopedic cast bandages for fixing bones during fractures and for fixing traumatized or inflamed joints. However, in order to obtain sufficient strength, it is rolled in multiple layers, which makes it heavy, has no breathability, and is susceptible to water. To compensate for these drawbacks of plaster casts, there are cast materials in which a flexible base fabric is coated or impregnated with a synthetic resin, such as a urethane prepolymer that hardens by reaction with water. Like a plaster cast, this cast material can be soaked in water and immediately applied to the affected area.It is extremely easy to use, and is also extremely light, strong, breathable, and waterproof compared to a plaster cast. It has many advantages, including excellent properties and good X-ray transparency. However, the base fabric used in conventional cast materials has a uniform structure over the entire surface and is made from a single material, and those with a high density and thickness are difficult to fit and wrap when used on uneven body parts. Thin materials with low density are easy to fit, but have the disadvantage that they must be wrapped in multiple layers to provide sufficient strength. [Problems to be Solved by the Invention] The problem to be solved by the present invention is to eliminate the above-mentioned drawbacks of base fabrics of cast materials, which have various advantages over plaster casts. [Means for solving the problem] According to the present invention, this problem is solved by providing a knitted or woven structure in which the flexibility increases stepwise from the center toward the width. be done. There are several methods for creating the above-mentioned knitted or woven structure. Alternatively, the thickness of the threads that make up the fabric is gradually reduced, and the fabric is composed of multiple types of fibers that gradually differ in flexibility from the center to the width, and each type of fiber has a different flexibility. Examples include a method in which the thickness is made to increase successively from the center toward the width, or a method in which these methods are combined with each other. In addition, in these methods, each method can be applied to wales or courses, warps or wefts, both wales and courses, or both warps and wefts. The density can be varied for each of the wale and course, warp and latitude, for example, in the range of 5 to 50/in at the center, 5 to 45/in at the middle, and 2 to 40/in at the sides. The thickness of the yarn can be varied for each of the wale and course, warp and weft, for example, in the range of 10 to 250 tex in the center, 10 to 230 tex in the middle, and 5 to 210 tex in the side part. can. The type of fiber can be selected from, for example, glass fiber, synthetic fiber, recycled fiber, and natural fiber. Here, the flexibility of these fibers changes from small to large in the above order, so the fibers on the left should be used closer to the center of the base fabric, and the fibers on the right should be used closer to the sides. . [Function] The base fabric according to the present invention is divided into a plurality of regions in the width direction from the center to the sides, and the flexibility of each region is changed so that it increases from the center to the sides. However, since the flexibility of the sides is greater than the flexibility of the center, when wrapped around the body, the sides of the base fabric also overlap, making that area extremely uneven. It is small and fits well on the surface of the body, and has the property of not stretching in the winding direction but stretching well in the width direction. [Example] Next, an example of the present invention will be described with reference to the drawings. For comparison, an example of a conventional one will be explained first. Conventional Example The base fabric was made of glass fiber, the thread thickness was 67.5 tex count, the density was 8 wells/in, and the base fabric was lacquered with 14 courses/in. A cast material was made by coating this base fabric with a polyurethane prepolymer prepared from isocyanate (MDI) and polyol (PPG: molecular weight 700), to which a metal thread catalyst and antifoaming agent were added. Example 1 (An example of density) The material is glass fiber, the thread thickness is 67.5 tex count, the density is 8 wales/in at the center of the base fabric (80% of the total width), 12 courses/in, and both sides ( 10 each in full width
%) was 5.5 wales/in and 5 courses/in to form a base fabric. A cast material was prepared by coating this base fabric with the same resin as in the above example. Example 2 (Example of changing the thread thickness) The material is glass fiber, both sides (each 8% of the total width)
22.5 tex thread, center (84% of total width)
Using 67.5 tex yarn, the base fabric was formed by lattice knitting with a density of 8 wells/in and 12 courses/in across the entire width. A cast material was prepared by coating this base fabric with the same resin as in the conventional example. Example 3 (Example of changing the material) 500 denier polyester fiber yarn is used on both sides (8% of the total width), and 67.5 tex glass fiber yarn is used in the center (84% of the total width), so that the density is the same as the entire width. A base fabric was formed by lattice weaving of 8 wells/in and 12 courses/in. A cast material was prepared by coating this base fabric with the same resin as in the conventional example. Example 4 (Example 1 with different density and thread thickness) The material is glass fiber, both sides (each 12% of the total width)
22.5 tex thread, center (76% of total width)
A base fabric was formed by using 67.5 tex yarn and latsiel knitting with a density of 8 wells/in and 5 courses/in on both sides and 8 wells/in and 12 courses/in in the center. A cast material was prepared by coating this base fabric with the same resin as in the conventional example. Example 5 (Example 2 with different density and thread thickness) The material is glass fiber, both sides (5% of the total width each)
22.5 tex thread, both middle parts (each 8 of the total width)
%) of 45 tex count yarn, center (full width 74%)
%) using yarn with a thread count of 67.5, the density is 5.5 wales/in, 5 courses/in on both sides, 8 wales/in, 5 courses/in in the middle, 8 wales/in, 12 courses/in in the center. The base fabric was formed by latsiel knitting. A cast material was prepared by coating this base fabric with the same resin as in the conventional example. Comparisons between the above-mentioned conventional example and each example with respect to various evaluation items are as follows. Here, ◎: Very good 〇: Good △: Slightly poor ×: Indicates poor.

〔Effect of the invention〕

The effects obtained by the present invention will be explained in comparison with conventional ones as follows. (1) Modelability Conventional products: They do not absorb uneven areas such as wrists, ankles, elbows, and knees very well, and do not fit tightly to the shape and are difficult to wrap. Invention: It absorbs well on uneven areas such as wrists, ankles, elbows, knees, etc., and is easy to fit into the shape and wrap easily. Reason: Flexibility has been increased by changing the structure of the base fabric. (2) Finishing properties Conventional product: When the cast material is rolled up, the edges of the overlapped parts of the base fabric stick out, and the overall surface is not smooth. Invention: The edges of the rolled and overlapped parts do not have large irregularities, and are smooth overall. Reason: Both sides have lower density than the center.
Because the thread is thin and the material is soft, the difference in thickness between the end of the overlapped part and the cast material wrapped underneath is small, so unevenness does not occur. (3) Treatability of cast edges Conventional product: The thicker the sides of the cast material, the thicker the cast edges. Furthermore, when the cast material is wound on top of the bottom wrapping material folded back at the cast edge, the cast edge becomes even thicker and hits the body. Difficult to process. Invention: Cast edges are thinner, and even when cast edges are processed, they are thinner and easier to process. It does not cause any pain to the patient. Reason: The structure of the sides of the base fabric has been changed, making it more flexible, making the sides thinner, and even when they overlap, they don't get too thick.

[Brief explanation of the drawing]

FIG. 1 is a model diagram of an embodiment of the present invention, and FIGS. 2a and 2b are illustrations of an example of how to knit the center and side parts of the base fabric according to the present invention, respectively. 1...Central part, 2...Middle part, 3...Side part.

Claims (1)

[Scope of Claims] 1. A base fabric for a cast material, characterized in that it has a knitted or woven structure in which flexibility increases stepwise from the center in the width direction. 2. The base fabric for cast material according to claim 1, characterized in that the density of the knitted or woven fabric decreases stepwise from the center in the width direction. 3. The base fabric for cast material according to claim 1 or 2, characterized in that the wale or warp density decreases stepwise from the center in the width direction. 4. The base fabric for cast material according to any one of claims 1 to 3, wherein the course or weft density decreases stepwise from the center in the width direction. 5. A cast material according to any one of claims 1 to 4, characterized in that the thickness of the threads constituting the knitted or woven fabric is gradually reduced from the center in the width direction. Base cloth. 6. The fabric according to any one of claims 1 to 5, characterized in that the thickness of the wale yarns or warp yarns constituting the knitted or woven fabric is gradually reduced from the center in the width direction. Base fabric for cast materials. 7 Claim 1, characterized in that the thickness of the course yarns or weft yarns constituting the knitted or woven fabric is gradually reduced from the center toward the width direction.
The base fabric for cast material according to any one of Items 1 to 6. 8 Constructed of multiple types of fibers that have different flexibility in stages from the center toward the width, and the flexibility of each type of fiber increases sequentially from the center toward the width. A base fabric for a cast material according to any one of claims 1 to 7, characterized in that: 9 Consisting of multiple types of wale yarns or warp yarns that have different flexibility in stages from the center toward the width direction, and each type of wale yarn or warp has a flexibility that varies from the center toward the width direction. The base fabric for a cast material according to any one of claims 1 to 8, characterized in that the base fabric gradually increases in size. 10 Consisting of a plurality of types of course yarns or wefts whose flexibility gradually differs from the center toward the width direction, and in addition, the flexibility of each type of course yarn or weft varies from the center toward the width direction. The base fabric for a cast material according to any one of claims 1 to 9, characterized in that the base fabric gradually increases in size.