JP7576894B1 - Manufacturing method for clothing or bedding and clothing or bedding - Google Patents

Abstract

The present invention provides a manufacturing method for clothing or bedding that is strong enough for use in a hot and humid environment and can be easily disassembled into individual parts, and the clothing or bedding.
[Solution] The method for manufacturing clothing or bedding of the present invention involves manufacturing clothing or bedding 1 using a sewing machine that uses an upper thread 2 and a lower thread 3, using a water-insoluble sewing thread made of cotton, silk, or chemical fibers or a blend as the upper thread 2, and a water-soluble sewing thread made from polyvinyl alcohol as the lower thread 3.
[Selected Figure] Figure 1

Description

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 the clothing or bedding manufactured by this method.

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

According to the clothing in Patent Document 1, the clothing is immersed in medium to high temperature water to dissolve the soluble fiber threads, leaving only the parts of the clothing made of insoluble fibers, which can be recovered. Specifically, each part of the clothing, such as the body and sleeves, made of fibers that are insoluble in hot water, alkaline solutions, etc., is sewn together with sewing thread that is soluble in hot water, alkaline solutions, etc., to form a finished product.

As a soluble sewing thread, a fiber thread made of polyvinyl alcohol-based fibers that dissolves easily when immersed in warm water, an alkaline solution, etc. is used (see, for example, Patent Document 2).

Japanese Patent Application Publication No. 8-81811 Special Publication No. 43-8992

However, as mentioned above, when sewing using a water-soluble polyvinyl alcohol-based soluble fiber thread as the sewing machine 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.

In view of the problems with the prior art, the object of the present invention is to provide clothing or bedding that is both strong enough for use in hot and humid environments and easy to disassemble into individual parts.

The method for manufacturing clothing or bedding of the present invention is characterized in that, when sewing materials together with a sewing machine using an upper thread and a lower thread to manufacture clothing or bedding, a water-insoluble sewing thread made of cotton, silk, chemical fibers or a blend is used as the upper thread, and a water-soluble sewing thread made of polyvinyl alcohol is used as the lower thread, the lower thread is made of water-soluble polyvinyl alcohol fiber produced by a solvent-wet cooling gel spinning method, and 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% .

According to the present invention, even when the 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 melt, and the sewing materials are securely bonded to each other, so that the strength of the clothing or bedding can be maintained. On the other hand, when the clothing or bedding is separated into each sewing material, the lower thread exposed on the back side of the clothing or bedding is exposed to moisture, so that the lower thread is melted and the clothing or bedding can be easily separated into each sewing material.
In addition, the lower thread is composed of water-soluble polyvinyl alcohol fiber produced by a solvent-wet cooling gel spinning method, and 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%. Therefore, it can be used as a suitable sewing thread.

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. 1 is a table showing the results of an experiment in which water-soluble sewing thread made from polyvinyl alcohol was subjected to a twisting process to obtain sewing thread. 3A to 3C are diagrams showing the degree of twist that can occur for the proper sewing thread, the somewhat problematic sewing thread, and the improper sewing thread obtained from the experiment of FIG.

Below, an embodiment of the present invention will be described with reference to the drawings. Figure 1 shows an enlarged cross section along the sewing thread of clothing or bedding manufactured by a method for manufacturing clothing or bedding according to one embodiment of the present invention. As shown in the figure, this sewn product 1 is manufactured by joining the sewing materials 4 that make up the clothing or bedding 1 with a sewing machine that uses an upper thread 2 and a lower thread 3. As the upper thread 2, a water-insoluble sewing thread made of cotton, silk, chemical fibers, or a blended thread is used.

A water-soluble sewing thread made from polyvinyl alcohol is used as the lower thread 3. Specifically, the lower thread 3 is made of a thread made of water-soluble polyvinyl alcohol fibers obtained by the solvent wet cooling gel spinning method (see Japanese Patent Publication No. 43-8992) that has been twisted (under-twisted and over-twisted).

The lower thread 3 can be one that dissolves in warm water of, for example, 40 to 100°C. However, to ensure the strength of the lower 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 of 70°C or higher. Each sewing material 4 that is sewn together with the upper thread 2 and lower thread 3 is composed of a water-insoluble fiber. The sewing machine that uses the upper thread 2 and lower thread 3 can be, for example, a sewing machine.

Incidentally, sewing threads used in sewing machines, such as common cotton or silk sewing threads, are those with a ratio of top twists to bottom twists of approximately 70%. However, in the case of sewing threads that are made from water-soluble polyvinyl alcohol fibers produced by the above-mentioned solvent wet cooling gel spinning method and dissolve at 70°C or higher, the inventor's following experiment has revealed that this twisting condition cannot be applied.

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 above-mentioned solvent-wet cooling 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 problematic (△), or unsuitable (×). Also shown are the results of the experiment using two types of yarn, No. 60 and No. 30.

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

In the experiment shown in Figure 2, the twisting conditions used were a 650 [T/m] first twist and multiple types of top twists with different numbers of twists. In Figure 2, the percentage of each top twist is also shown, assuming that the number of first twists of 650 [T/m] is 100 [%].

The 455 [T/m] second twist in Figure 2 (70% of the number of second twists) corresponds to the twisting conditions applied to general sewing threads. For both No. 60 and No. 30 threads, the sewing threads obtained under these conditions were found to be inappropriate (x) for use as sewing threads. A second twist of 768 [T/m] (118%]) was also found to be inappropriate (x).

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].

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

In addition, the twisting conditions that may be somewhat difficult exist when the ratio is in the range of 94-108%. On the other hand, when the ratio is below 70% or above 118%, it is determined that there are no suitable twisting conditions. In other words, while sewing is possible with twisting conditions in this range, as shown in Figure 3C, twisting of the yarn occurs, which is undesirable as it causes problems with sewing.

When manufacturing clothing or bedding 1, first, sewing thread made of cotton, silk, chemical fibers, 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 lower thread 3 is often less noticeable than the upper thread, dyeing may be omitted to simplify the process and reduce manufacturing costs.

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 perform sewing. Then, the joining portions of the two pieces of sewing material (pieces of fabric) 4 that are to be joined by the upper thread 2 and the lower thread 3 are 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.

This joins two pieces of sewing material (cloth pieces) 4 together as shown in Figure 1. By repeating this joining of sewing material 4, clothing or bedding 1 is produced in which 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.

On the other hand, when separating the clothing or bedding 1 into the sewing materials (pieces of cloth) 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 of, for example, 95°C in a dissolving tank for, for example, 30 minutes. At this time, in order to promote the dissolution of the lower thread 3, for example, a non-ionic surfactant may be added to the hot water at about 0.01 to 20 [g/liter].

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 fabric) 4. The separated sewing materials (pieces of fabric) 4 are reused.

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. 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. A jig for holding the clothing or bedding 1 may also be used to make it easier to expose the lower thread 3 to moisture.

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

The lower thread 3 is made of polyvinyl alcohol fiber that is soluble in hot water at 70°C or higher using a solvent-wet cooling gel spinning method, and is twisted under twisting conditions where the ratio of the number of upper twists to the number of lower twists is within the range of 95-105%, so it can be used as a suitable sewing thread.

In addition, since the lower thread 3 is dyed in an environment at a lower temperature than the temperature at which it melts, the brightness, color, 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, the dyeing of the lower thread 3 may be omitted to improve productivity.

1...Clothing or bedding, 2...Upper thread, 3...Lower thread, 4...Piece of cloth.

Claims (3)

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 fibers or a blend is used as the upper thread, and a water-soluble sewing thread made of polyvinyl alcohol is used as the lower thread, the lower thread being made of water-soluble polyvinyl alcohol fiber produced by a solvent-wet cooling gel spinning method, and 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 [%] . The method for manufacturing clothing or bedding according to claim 1, characterized in that the lower thread is dyed in a low-temperature environment lower than the temperature at which the lower thread melts. 3. Clothing or bedding produced by the method of claim 1 or 2 .

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