Method for manufacturing clothing or bedding and clothing or bedding

Abstract

To provide a method for producing clothing or bedding having both toughness and easiness of decomposition into each part in use under a high-temperature and high-humidity environment, and to provide the clothing or bedding.SOLUTION: In the method for producing the clothing or bedding, when the clothing or bedding 1 is produced by a sewing machine using an upper thread 2 and a lower thread 3, a water-insoluble sewing thread composed of cotton, silk, chemical fiber or blended yarn is used as the upper thread 2 and a water-soluble sewing thread using polyvinyl alcohol as a raw material is used as the lower thread 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing clothing or bedding using a sewing machine that uses an upper thread and a lower thread, and to clothing or bedding manufactured by this method. [Background technology]

[0002] In recent years, recycling of sewn products, mainly clothing, has begun to attract attention. The most efficient way to decompose sewn products is to dissolve the sutures. In response to this, applications have been filed for clothing constructed by joining parts made of non-soluble fibers with soluble fiber threads (see, for example, Patent Document 1).

[0003] According to the garment disclosed in Patent Document 1, the garment is placed in medium- to high-temperature water to dissolve the soluble fiber yarns, leaving only the parts of the garment made of insoluble fibers, which can be recovered. Specifically, this garment is completed by sewing together garment parts such as the body and sleeves made of fibers insoluble in hot water, alkaline solution, etc., with sewing thread that is soluble in hot water, alkaline solution, etc.

[0004] As the soluble sewing thread, a fiber thread made of polyvinyl alcohol-based fiber that is easily dissolved by immersion in warm water, an alkaline solution, or the like is used (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 8-81811 [Patent Document 2] Special Publication No. 43-8992 Summary of the Invention [Problem to be solved by the invention]

[0006] However, as mentioned above, when sewing using a water-soluble polyvinyl alcohol-based soluble fiber thread as the sewing thread, if the resulting sewn product is used in a hot and humid environment, the sewing thread that connects each sewing material (piece of fabric) of the sewn product may melt, causing the sewn product to become brittle.

[0007] SUMMARY OF THE INVENTION In view of the problems of the prior art, an object of the present invention is to provide clothing or bedding that is strong enough to withstand use in a hot and humid environment and that can be easily disassembled into individual parts. [Means for solving the problem]

[0008] The method for manufacturing clothing or bedding of the present invention is characterized in that, when sewing materials together using a sewing machine that uses an upper thread and a lower thread, the upper thread is a water-insoluble sewing thread made of cotton, silk, chemical fiber, or a blend, and the lower thread is a water-soluble sewing thread made from polyvinyl alcohol.The clothing or bedding of the present invention is also characterized in that it is manufactured by the method for manufacturing clothing or bedding of the present invention. [Effects of the Invention]

[0009] According to the present invention, even when clothing or bedding is used in a hot and humid environment, the upper thread exposed on the front side of the clothing or bedding does not dissolve, ensuring reliable bonding of the sewing materials, thereby maintaining the strength of the clothing or bedding. On the other hand, when separating the clothing or bedding into each sewing material, the lower thread exposed on the back side of the clothing or bedding is exposed to moisture, which dissolves the lower thread and makes it easy to separate the clothing or bedding into each sewing material. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is an enlarged cross-sectional view showing a cross section along a sewing thread of clothing or bedding manufactured by the clothing or bedding manufacturing method of the present invention. [Figure 2] 1 is a table showing the results of an experiment in which water-soluble sewing thread made from polyvinyl alcohol was subjected to twisting processing to obtain sewing thread. [Figure 3] 3A to 3C are diagrams showing the degree of twist that can occur for the appropriate sewing thread, the slightly problematic sewing thread, and the inappropriate sewing thread obtained through the experiment of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows an enlarged cross section of clothing or bedding, taken along a sewing thread, produced by a method for producing clothing or bedding according to one embodiment of the present invention. As shown in the figure, this sewn product 1 is produced by joining together the sewing materials 4 that make up the clothing or bedding 1 using a sewing machine that uses an upper thread 2 and a lower thread 3. The upper thread 2 is a water-insoluble sewing thread made of cotton, silk, chemical fiber, or a blended yarn.

[0012] A water-soluble sewing thread made from polyvinyl alcohol is used as the lower thread 3. Specifically, the lower thread 3 is made by subjecting a thread made of water-soluble polyvinyl alcohol fibers obtained by a solvent wet cooling gel spinning method (see Japanese Patent Publication No. 43-8992) to twisting processing (first twist and second twist).

[0013] The bobbin thread 3 may be one that dissolves in warm water at, for example, 40 to 100°C, but to ensure the strength of the bobbin thread 3 when used in a humid environment, it is preferable to use one that has a low degree of saponification and dissolves in warm water at 70°C or higher. The sewing materials 4 sewn together with the upper thread 2 and bobbin thread 3 are made of water-insoluble fibers. The sewing machine that uses the upper thread 2 and bobbin thread 3 may be, for example, a sewing machine.

[0014] Incidentally, sewing threads used in sewing machines, such as ordinary cotton or silk threads, have a ratio of top twists to bottom twists of approximately 70%. However, the inventors' experiments have shown that this twisting condition cannot be applied to sewing threads made from water-soluble polyvinyl alcohol fibers produced by the solvent-wet cooled gel spinning method, which dissolve at temperatures above 70°C.

[0015] Figure 2 shows the results of an experiment investigating the relationship between the twisting conditions when twisting water-soluble polyvinyl alcohol fiber yarns obtained by the solvent-wet cooled gel spinning method to obtain sewing threads and the suitability of the resulting sewing threads. The results show whether the sewing threads obtained under each twisting condition were suitable (○), slightly unsuitable (△), or unsuitable (×). The results are also shown for two types of yarn, No. 60 and No. 30.

[0016] Figures 3A to 3C show the twist that occurs in sewing threads that are deemed appropriate (○), slightly defective (△), or unsuitable (×). If the sewing thread is appropriate (○), there is no twist in the sewing thread, as shown in Figure 3A. If the sewing thread is slightly defective (△), twist occurs, as shown in Figure 3B. If the sewing thread is unsuitable (×), there is a significant amount of twist in the thread, as shown in Figure 3B, making it unsuitable for sewing thread.

[0017] In the experiment shown in Figure 2, the twisting conditions were such that a first twist of 650 [T / m] was performed with multiple types of final twists of different numbers. In Figure 2, the percentage of the number of final twists when the number of first twists of 650 [T / m] is set to 100 [%] is also shown.

[0018] The final twist of 455 [T / m] in Figure 2 (70% final twist rate) corresponds to the twisting conditions applied to general sewing threads. The sewing threads obtained under these conditions, for both No. 60 and No. 30 threads, were found to be unsuitable (×) for use as sewing threads. The final twist of 768 [T / m] (118%]) was also found to be unsuitable (×).

[0019] On the other hand, there were some difficulties (△) when the final twist was 610 [T / m] and 704 [T / m], while the results were appropriate (○) when the final twist was 620 [T / m], 640 [T / m], 650 [T / m], 660 [T / m], 672 [T / m], and 682 [T / m].

[0020] As shown in Figure 2, the optimum twisting conditions for obtaining sewing thread by twisting a yarn made from water-soluble polyvinyl alcohol fiber, which dissolves at 70°C or higher and is produced by the solvent-wet cooled gel spinning method, are that the ratio of the number of top twists to the number of first twists for a 650 [T / m] first twist is in the range of 95 to 105 [%].

[0021] Furthermore, the twisting conditions, including those with some difficulty, exist within the ratio range of 94 to 108%. On the other hand, it is determined that there are no appropriate twisting conditions when the ratio is below 70% or above 118%. In other words, while sewing is possible under twisting conditions in this range, as shown in Figure 3C, twisting of the yarn occurs, which is undesirable as it interferes with sewing.

[0022] When manufacturing clothing or bedding 1, first, sewing thread made of cotton, silk, synthetic fiber, or a blend that has been appropriately twisted is prepared as the upper thread 2. Then, lower thread 3 is prepared by twisting under the appropriate twisting conditions shown in Figures 2A and 2B and dyeing in a low-temperature environment below the melting point. Note that, since the lower thread 3 is often less noticeable than the upper thread, dyeing may be omitted, simplifying the process and reducing manufacturing costs.

[0023] Next, the upper thread 2 and the lower thread 3 are set in a sewing machine, such as a sewing machine, that uses them to sew. The joining portions of the two pieces of sewing material (pieces of fabric) 4 to be joined by the upper thread 2 and the lower thread 3 are then placed in a predetermined position on the sewing machine, and the sewing machine is driven to join the two pieces of sewing material 4 with the upper thread 2 and the lower thread 3.

[0024] As a result, two sewing materials (pieces of fabric) 4 are joined together as shown in Figure 1. By repeating this joining of sewing materials 4, clothing or bedding 1 is manufactured in a state where the upper thread 2 is exposed on the front side of the clothing or bedding 1 and the lower thread 3 is exposed on the back side.

[0025] On the other hand, when separating the clothing or bedding 1 into the sewing materials (cloth pieces) 4, the lower thread 3 can be easily separated by exposing it to moisture and dissolving it. The lower thread 3 can be exposed to moisture, for example, by storing the clothing or bedding 1 in a storage bag and immersing it in hot water at, for example, 95°C in a dissolving bath for, for example, 30 minutes. At this time, to promote the dissolution of the lower thread 3, for example, a nonionic surfactant may be added to the hot water at about 0.01 to 20 [g / L].

[0026] As a result, the shape of the clothing or bedding 1 is maintained by the storage bag, the bobbin thread 3 dissolves, and the clothing or bedding 1 is separated into individual sewing materials (pieces of cloth) 4. The separated sewing materials (pieces of cloth) 4 are reused.

[0027] Note that when exposing the lower thread 3 to moisture, steam at 100°C or higher or hot water supplied from a hose or funnel may be used. Alternatively, moisture applied to the lower thread 3 with an iron or the like may be heated to a temperature at which the lower thread 3 dissolves. To facilitate exposing the lower thread 3 to moisture, a jig for holding the clothing or bedding 1 may be used.

[0028] According to this embodiment, even when clothing or bedding 1 is used in a humid environment, the upper thread 2 exposed on the front side of clothing or bedding 1 is water-insoluble and ensures bonding of the sewing materials 4, thereby maintaining the strength of clothing or bedding 1. On the other hand, the lower thread 3 exposed on the back side of clothing or bedding 1 is a water-soluble sewing thread made from polyvinyl alcohol, so that by exposing the lower thread 3 to moisture, clothing or bedding 1 can be easily separated into each sewing material 4 and reused.

[0029] In addition, the lower thread 3 is made of polyvinyl alcohol fiber that can be dissolved in hot water of 70°C or higher using a solvent wet cooled gel spinning method, and has been twisted under twisting conditions where the ratio of the number of upper twists to the number of lower twists is within the range of 95 to 105%, so it can be used as an appropriate sewing thread.

[0030] Furthermore, since the lower thread 3 is dyed in an environment at a temperature lower than the temperature at which it melts, the brightness and hue of the dyeing can be adjusted as desired when viewed from the upper thread 2 side of the clothing or bedding 1. Note that since the color of the lower thread 3 does not significantly affect the appearance from the upper thread 2 side, dyeing of the lower thread 3 may be omitted to improve productivity. [Explanation of symbols]

[0031] 1...Clothing or bedding, 2...Upper thread, 3...Bottom thread, 4...Piece of cloth.

Claims

1. A method for manufacturing clothing or bedding, in which sewing materials are sewn together with a sewing machine using an upper thread and a lower thread to manufacture clothing or bedding, characterized in that a water-insoluble sewing thread made of cotton, silk, chemical fiber or a blend is used as the upper thread, and a water-soluble sewing thread made from polyvinyl alcohol is used as the lower thread.

2. 2. The method for manufacturing clothing or bedding according to claim 1, wherein the bobbin thread is made of a water-soluble polyvinyl alcohol fiber produced by a solvent wet cooled gel spinning method.

3. The method for manufacturing clothing or bedding according to claim 2, characterized in that the lower yarn is twisted under twisting conditions in which the ratio of the number of upper twists to the number of lower twists is within the range of 94 to 108%.

4. 2. The method for manufacturing clothing or bedding according to claim 1, wherein the lower thread is dyed in a low-temperature environment lower than the temperature at which the lower thread melts.

5. Clothing or bedding produced by the method for producing clothing or bedding according to any one of claims 1 to 4.

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