JPH05186924A - Hot-melt elastic yarn and hot-melt product produced by using the yarn - Google Patents

Abstract

PURPOSE:To provide hot-melt elastic yarn enabling efficient bonding and giving a bonded product resistant to peeling even by stretching. CONSTITUTION:The objective hot-melt elastic yarn is produced by using elastic yarn A as core yarn and covering the yarn A with two or more non-elastic yarns one by one from the inside. The two or more non-elastic yarns are made of a thermoplastic synthetic fiber. The melting point of the inner non-elastic yarn B in any two of the non-elastic yarns is lower than the melting point of the outer non-elastic yarn C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to bonding by elastic bonding (heat melting, high frequency melting, ultrasonic melting, etc.) in which a core of an elastic thread is covered with double or more thermoplastic synthetic fiber threads. ) Useful in gloves, masks, aprons, underwear,
The present invention relates to a heat-bondable elastic yarn used for a belt and the like and a heat-bonded product using the same.

[0002]

2. Description of the Related Art Disposable non-woven masks which are made of non-woven cloth such as paper to cover the mouth and nose are used in various industrial fields. Such a non-woven fabric mask is made by folding back both ends of a non-woven fabric cut into strips, tying the ends of elastic yarns that will become ear-hook bands, or adhering them with an adhesive to form a ring. Is sandwiched between the folded portions of the non-woven fabric, and the ends of the folded portions are glued and attached to both ends of the non-woven fabric.

As the elastic yarn, a yarn in which spandex yarn is double-covered with cotton yarn is generally used. Since the non-woven mask is a disposable type, it is required to be manufactured efficiently and to reach a low cost.
However, there is a problem in that the manufacturing efficiency is poor if the work of tying threads to form the ring to be the ear hanging band is involved.

When the both ends of the stretchable yarn are bonded with an adhesive, the amount of adhesive applied and the adhesive point are adjusted, and after application,
Since it is necessary to perform drying, it is difficult to manufacture efficiently because the adjustment items are complicated, and there is a problem that the degree of peeling is high when the bonded product is strained. The inventors have considered using elastic yarns that can be bonded by heat melting or the like, that is, thermoadhesive elastic yarns, in order to efficiently perform work for bonding.

Conventionally, the heat-bondable elastic yarn is knitted into the knitted fabric in order to prevent the edges of the wrist of the work gloves from being frayed. As a conventional heat-adhesive elastic thread, an elastic thread is used as a core, and a thicker bobbin thread having no heat-adhesiveness and thermosetting property is twisted on the outer side without a gap, and a thin heat-bonded thread is adhered to this bobbin thread. Elastic knitting yarn (see Japanese Patent Publication No. 61-17938) obtained by twisting a flexible yarn in the opposite direction to the bobbin yarn, and a small amount of heat-shrinkable yarn having elasticity at normal temperature, are heat-adhesive and heat-shrinkable. The overlocking yarn which is covered with a yarn not having a wire and is further twisted in a state of being covered with a small amount of a heat-bonding yarn (see Japanese Patent Publication No. 60-52222).
Is proposed.

[0006]

The stretchable knitting yarns and the overlocking yarns do not have a good effect of preventing fraying, have particularly poor wash resistance, and have the drawback that white powder may fall off in the running yarn state.
On the other hand, disposable aprons are used to prevent the clothes from becoming dirty. Such a disposable apron,
I use a paper band to hang it around my neck, but it takes time to put on and take off because I need to tie it up and take it off when I put it on and off.
It may not be possible to deal with different body sizes. If the elastic yarn is used for the neckband, it is easy to put on and take off, and it can be used even if the body size is different. In order to bond the elastic yarn to the cloth product, it is more efficient to heat-bond the heat-bondable elastic yarn as described above than to use an adhesive, and the peel strength is also increased.

The present invention provides a thermoadhesive elastic yarn which can efficiently bond thermoadhesive elastic yarns to each other or a cloth product and a thermoadhesive elastic yarn, and which is less likely to peel when tensioned. This is the first issue. A second object of the present invention is to provide a heat-bonded product that can be efficiently manufactured by using such a heat-bondable elastic yarn.

[0008]

In order to solve the above-mentioned first problem, the present invention uses an elastic yarn A as a core yarn, and the elastic yarn A is composed of two or more non-elastic yarns, one from the inside. Thermo-adhesive elastic yarns covering in order, wherein the two or more non-elastic yarns are thermoplastic synthetic fibers, and two of the non-elastic yarns are inner non-elastic yarns. Provided is a thermoadhesive elastic yarn, characterized in that the melting point of B is arranged to be lower than the melting point of the outer non-elastic yarn C.

In order to solve the second problem, the present invention provides a heat-bonded product obtained by heat-bonding the heat-bondable elastic yarn of the invention. The heat-bonded product of this invention includes
The mask includes a ring-shaped elastic yarn formed by superposing both ends of the thermoadhesive elastic yarn of the present invention and thermally adhering the superposed elastic yarn on the ear hanging band.
This mask is, for example, a non-woven mask in which ring-shaped elastic yarns are attached to both ends of a band-shaped non-woven fabric to form an ear hanging band.

The heat-bonded product of the present invention also includes a heat-bonded product in which the heat-bondable elastic yarn of the present invention is heat-bonded to the thermoplastic synthetic fiber cloth product at both ends thereof to form a hanging band. Has been. This heat-bonded product is, for example, a non-woven apron in which the breast pad is made of non-woven fabric and the hanging band is heat-bonded to both upper ends of the breast pad to form a neck hanging band.

The elastic yarn A used for the core in the present invention is, for example, polyurethane elastic yarn such as spandex yarn,
Examples thereof include those made only of elastic threads such as polyetherester type elastic threads, natural rubber, and synthetic rubber, but elastic threads in which the elastic threads are covered with non-elastic threads may also be used. The denier of the elastic yarn A is, for example, about 105 to 3360d. If it is thicker than this, running may become unstable in the covering process, causing the clogging of the halo tube (hollow spindle). If it is thinner than that, when a ring-shaped elastic yarn is used, a ring (for example, a perfect circular ring) ) Is twisted and does not maintain its shape, which may reduce the workability of the strap. The breaking elongation of the elastic yarn A is, for example, about 300 to 600%. If it is lower than this, there is a risk of insufficient elongation as a hanging band, and if it is higher than this, there is a risk of yield loss of the heat-bonded product and occurrence of elastic yarn omission due to uneven heating and melting of the elastic core yarn and non-elastic yarn. ..

In the present invention, two of the non-elastic yarns that cover the elastic yarn A, which is the core yarn, more than twice are set so as to have different melting points. That is, the melting point of the inner non-elastic yarn B of the two non-elastic yarns is the outer non-elastic yarn C.
It is lower than the melting point of. In the present invention, the non-elastic yarn B that directly covers the elastic yarn A is made of a lower melting point non-elastic synthetic fiber, and the outermost non-elastic yarn C is made of a higher melting point non-elastic synthetic fiber. Is preferred.

If two or more non-elastic yarns are arranged so that their melting points are lower in order from the inner side to the outer side, the problem of elastic yarn loss or cutting (hereinafter referred to as "core breaking") occurs. is there. The difference between the melting points of the two non-elastic yarns B and C is not particularly limited, but thermal bonding of the non-elastic yarn B to the elastic yarn is completed quickly, and the outer non-elastic yarn C is next subjected to thermal bonding. From the viewpoint of heat bonding in the order of occurrence, 5 ° C or higher is preferable, and 10 ° C or higher is more preferable.

As the non-elastic yarns B and C used for covering the elastic yarn A in the present invention, for example,
It is appropriately selected from the following group of synthetic fiber yarns in consideration of at least the melting point. However, the yarns are not limited to the following yarns, and synthetic fibers made of a copolymer can be used. Nylon 4 yarn (melting point: 115 to 120 ° C) Polyvinylidene chloride yarn (melting point: 165 to 185 ° C) Polyvinyl chloride yarn (melting point: 200 to 210 ° C) Nylon 6 yarn (melting point: 215 to 220 ° C) Nylon 66 yarn ( Melting point: 250 to 260 ° C.) Polyester yarn (polyethylene terephthalate yarn) (Melting point: 255 to 260 ° C.) When the elastic yarn A is covered with triple or more non-elastic yarns, two of the non-elastic yarns are as described above. For the non-elastic yarns B and C, the rest are non-elastic yarns that can be heat-bonded (for example, non-elastic yarn B, non-elastic yarn C,
And combinations thereof). However, non-elastic yarns that do not melt by heating (in this case, natural fiber yarns) are excluded. Also, nylon easily turns yellow when exposed to air, so in order to prevent yellowing from occurring, place an inelastic thread other than nylon in the outermost layer rather than a nylon thread. Also, it is good to arrange nylon thread inside.

The denier of the non-elastic yarn that covers the elastic yarn A is, for example, about 50 to 300 d. If it is thicker than this, the rewound yarn length on the bobbin is short, which may reduce the productivity, and if it is thin, the apparent thickness of the hanging band may be too thin and durability may be insufficient. In the present invention, two non-elastic yarns C made of a non-elastic synthetic fiber having a higher melting point may be covered outside the non-elastic yarn B. This has the advantage that the thermoadhesive elastic yarn has a more stable twist, is less likely to kink, and is easy to handle. The two inelastic threads C may be the same thread or different threads. In the case of different yarns, if the inner non-elastic yarn C ₁ has a higher melting point than the outer non-elastic yarn C ₂ , the heat-bonding of the heat-adhesive elastic yarns or the heat-bonding with other synthetic fiber non-woven fabrics becomes easier. Therefore, it is preferable.

The covering of the non-elastic yarn is performed so that the upper and lower yarns are twisted in opposite directions. The thermoadhesive elastic yarn of the present invention may have a reduced productivity or performance if it is covered with four or more layers.
Double cover ring with inelastic thread (duffle cover ring)
It is preferable to use a triple covering.

The thermoadhesive elastic yarn of the present invention uses, for example, the elastic yarn A and the inelastic yarns B and C as described above,
It is made as follows. However, the manufacturing method is not limited to the following. With a core yarn made of elastic yarn stretched at a draft ratio of 300% or more, and a plurality of inelastic yarns made of a double covering ring twisting machine, or a multi-stage covering ring twisting machine having a bobbin attached thereto. At the time of covering, the non-elastic yarn B is a lower twist yarn and the non-elastic yarn C is an upper twist yarn. The twist direction is alternately opposite.

The thermoadhesive elastic yarn thus obtained stretches in response to tensile force and contracts due to relaxation. When the thermo-adhesive elastic yarns are combined with each other or the thermo-adhesive elastic yarns are combined with the thermoplastic synthetic fiber cloth product, for example, the following process is performed. Among the non-elastic yarns used for the cover ring in the state where the thermo-adhesive elastic yarn is bent in a ring shape and the both ends are overlapped, or the thermo-adhesive elastic yarn and the cloth product are overlapped. Highest melting point temperature (specifically polyester yarn 2
(55 to 260 ° C.) and hold for 6 seconds to 2 minutes. This causes the non-elastic yarns B and C to melt. After that, the non-elastic yarns B and C are solidified by cooling, and the heat-adhesive elastic yarns or the heat-adhesive elastic yarns are bonded to the cloth product. In order to thermally bond the heat-bondable elastic yarn, for example, it is heated and melted in a pressure-bonded state, ultrasonically bonded, or high-frequency bonded [welder bonding or welder processing. For example, a high frequency of 20 to 27 megahertz (MHz) is applied for 6 to 20 seconds while being pinched between the high frequency electrodes. ] Means etc. are adopted.

Next, as the cloth product (or cloth product) used in the present invention, a non-woven fabric, a woven or knitted fabric, etc. may be mentioned. When heat-bonding the heat-bondable elastic yarn and the cloth product, it is necessary to use a cloth product made of thermoplastic synthetic fiber. This is because both have a melting point and are heat-bonded to each other. The heat-bondable elastic yarn of the present invention is not limited to the above mask and apron, but has other uses,
For example, it can be used for underwear, belts, gloves and the like.

[0020]

In the thermoadhesive elastic yarn of the present invention, the temperature at the time of bonding is set to the same temperature as or higher than the melting point of the highest melting point among the nonelastic yarns used for the covering. By doing so, the inner non-elastic yarn B (consisting of the low melting point fiber) is first melted, and the core elastic yarn A is firmly gripped to prevent the elastic yarn A from contracting (pulling out) and finally to the outer side. The non-elastic yarn C (made of high-melting point fiber) is fused with the object to be bonded to form a strong bonded body.

Since the non-elastic yarn covers the elastic yarn A more than twice, the heat-adhesive elastic yarn has a stable twist and is difficult to twist. Therefore, when a large number of heat-bonded products using the heat-bondable elastic yarns are stacked, the heat-bondable elastic yarns are less likely to be entangled.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments of the present invention. However, the present invention is not limited to what is shown in the drawings. FIG. 1 shows an embodiment of the thermoadhesive elastic yarn of the present invention. In FIG. 1, a represents the layer structure in cross section and b represents the side surface. As shown in FIG. 1, the thermo-adhesive elastic yarn 1 has an elastic yarn A arranged on a core, and the elastic yarn A is covered with a non-elastic yarn B made of a thermoplastic synthetic fiber having a low melting point. Further, an inelastic yarn C made of a thermoplastic synthetic fiber having a high melting point is covered from the outside in the opposite direction. The covering of the non-elastic yarn B is performed with a twist number of 400 to 2100 T / M, for example. If it exceeds this range, the bondage becomes strong and the elongation becomes low, and it may be difficult to obtain an appropriate stretch. If it is below this range, the thermal adhesive force may be weak and the elastic yarn may be pulled out. The covering of the non-elastic yarn C is, for example, 0.8 times the lower twist number.
~ 0.95 times more dense. If this range is exceeded, the tension balance between the lower and upper warp yarns may be disrupted, resulting in nep-shaped knot yarns or thread breakage. If it falls below this range, work will occur due to warp (or snare) due to residual torque. It may become a heat-adhesive elastic thread that is difficult to handle.

FIG. 2 shows another embodiment of the heat-adhesive elastic yarn of the present invention. In FIG. 2, a shows the layer structure in section,
b is represented by the side surface. As shown in FIG. 2, the thermo-adhesive elastic yarn 10 comprises two non-elastic yarns C made of a thermoplastic synthetic fiber having a high melting point on the outside of the non-elastic yarn B shown in FIG.
₁ and C ₂ cover in opposite directions. The non-elastic yarn C ₁ is covered with, for example, 0.8 to 0.95 times the density of the non-elastic yarn B. If this range is exceeded, the tension balance between the lower twist and the upper twist (C ₁ ) will be lost, and there is a risk of knotting yarns or thread breakage. If it is below this range, the residual torque will cause warping (or snares), which makes thermal bonding difficult to work. There is a risk that it will become a flexible elastic thread. Covering the non-elastic yarn C _2, for example, with respect to non-elastic yarn C ₁ is carried out at a density of 0.7 to 0.85 times. If it exceeds this range, a stick-like thermo-adhesive elastic yarn with insufficient elasticity may be likely to be formed, and if it is below this range, there may be poor covering, curl (or twist) in a hanging band, or poor appearance.

The heat-bonded product of the present invention is produced by heat-bonding the above-mentioned heat-bondable elastic yarn of the present invention. As shown in FIG. 3, the ring-shaped elastic yarn 3 made of the heat-bondable elastic yarn 1 or 10 of the present invention is
The heat-adhesive elastic yarns 1 or 10 are bent in a ring shape and overlapped with each other, and at an intersection 1a thereof, as shown in FIG. 4, a heat-adhesion means 2 (for example, an ultrasonic adhesion means or a high-frequency adhesion means) is applied under pressure. It is made by welding. Such a ring-shaped stretchable yarn 3 is used, for example, in an ear hanging band of a disposable mask. When the heat-bonded product is the non-woven mask 4 as shown in FIG. 5, the cloth product may be, for example, a non-woven fabric cut into strips having a width sufficient to cover a human mouth and nose (for example, 41) is used. The mask 4 is made, for example, by folding back both ends of the non-woven fabric 41 to sandwich a part of the ring-shaped stretchable yarn 3 and thermally bonding or pasting the tip portion 42 of the folded portion. As shown in FIG. 8, the mask 4 is made by superposing both ends of the thermo-adhesive elastic yarn 1 or 10 on the four corners of the non-woven fabric 41 and thermally adhering the superposed portions. In FIG. 8, 6 is a heat-bonding part.

As shown in FIG. 7, the cloth product is an apron-shaped non-woven fabric 50 having a breast pad portion 51, and the thermo-adhesive elastic threads 1 or 10 are provided at both upper ends of the breast pad portion 51 as shown in FIG. As can be seen, the non-woven apron 5 is welded under pressure by the heat bonding means 2 to form the neck strap 31. Similarly, the waist stop band 32 is also heat-bonded.
This non-woven apron 5 can be used for applications such as surgical clothes, clothes for chemical experiments, and aprons for the food service industry. In the figure, 6 is a heat-bonding portion.

Specific examples and comparative examples of the present invention will be shown below, but the present invention is not limited to the following examples. The following yarns were used in the following examples and comparative examples. Elastic yarn A / A-1: Polyether spandex yarn (breaking elongation 520%, 560d monofilament yarn) Non-elastic yarn B / B-1: Nylon 6 yarn (melting point 215 to 220 ° C., 14)
0d multifilament yarn, number of filaments 48) B-2: Nylon 4 yarn (melting point 115 to 120 ° C, 10
0d multifilament yarn, number of filaments 10) B-3: modified polyester yarn (melting point 165 to 170)
℃, 180d multifilament yarn, number of filaments 48) non-elastic yarn C · C-1: polyester (polyethylene terephthalate) yarn (melting point 255-260 ° C, 150d multifilament yarn, number of filaments 48) No melting point Elastic yarn / M-1: Cotton yarn 40 ^S (card yarn) (Example 1-a) With a normal double-covering twisting machine,
Elastic yarn A-1 as core yarn, inside (usually called lower twist yarn)
The non-elastic yarn B-1 is arranged on the outside, and the non-elastic yarn C-1 is arranged on the outer side (usually referred to as the upper twist yarn) in the sheath portion. The draft ratio of the elastic yarn is 4.5 times, and the twist number is lower twist. Double covering was carried out at 500 T / M (S twist) with an upper twist of 0.85 and a lower twist number (Z twist) to obtain a heat-adhesive elastic yarn (1) of the present invention, which is a covered elastic yarn.

(Example 1-b) A modified twisting machine in which a hollow spindle, a bobbin and a driving device are added to the double-covering twisting machine in one stage. The elastic yarn C-1 was arranged so that it was twisted in the opposite direction, and the number of twists was 0.85 x upper twist (S twist), and the covering was tripled in the same manner as in Example 1-a. The heat-adhesive elastic yarn (2) of the present invention, which is a covered elastic yarn, was obtained.

(Examples 1-c, 1-d) The coating elasticity having a three-layer structure was obtained in the same manner as in Example 1-a except that the yarn was changed as shown in Table 1 in Example 1-a. The thermoadhesive elastic yarns (3) and (4) of the present invention, which are yarns, were obtained. (Example 1-e, 1-f) A coated elastic yarn having a four-layer structure in the same manner as in Example 1-b except that the yarn is changed as shown in Table 1 in Example 1-b. The heat-bondable elastic yarns (5) and (6) of the present invention were obtained.

(Comparative Example 1-a) In Example 1-a,
Comparative thermoadhesive elastic yarn (1) in the same manner as in Example 1-a, except that the outer non-elastic yarn C was not used and the two-layer structure was adopted.
Got As shown in FIG. 9, the comparative thermo-adhesive elastic yarn (1) is a thermo-adhesive elastic yarn in which the core of the elastic yarn 21 is covered with the non-elastic yarn 22 (here, the non-elastic yarn B). The thread 20.

(Comparative Example 1-b) In Example 1-a,
Comparative thermoadhesive elastic yarn (2) as in Example 1-a, except that the inner non-elastic yarn B was not used and the two-layer structure was adopted.
Got As shown in FIG. 9, the comparative thermo-adhesive elastic yarn (2) is a thermo-adhesive elastic yarn in which the core of the elastic yarn 21 is covered with the non-elastic yarn 22 (here, the non-elastic yarn C). The thread 20.

(Comparative Example 1-c) In Example 1-a,
A comparative thermoadhesive elastic yarn (3) was obtained in the same manner as in Example 1-a except that the non-elastic yarns B and C were replaced with each other. (Comparative Example 1-d) Comparative example 1-a was performed in the same manner as in Example 1-a, except that the non-elastic yarn C was used instead of the non-elastic yarn C. A heat-bondable elastic yarn (4) was obtained.

Table 1 shows the layer structure and combination arrangement of the heat-adhesive elastic yarns of the above Examples and Comparative Examples.

[0033]

[Table 1]

With respect to the thermoadhesive elastic yarns of the above Examples and Comparative Examples, the elongation rate, the efficiency of thermal adhesion, the peel strength after thermal adhesion, and the twist of the ring were examined, and the results are shown in Table 2. Elongation is 20 mg with initial load of 10 mg / apparent denier hanging
After that, a constant load of 1,000 g was suspended, and the length after _one day and night (L ₁ : unit cm) was measured and calculated from the following formula.

Elongation rate [%] = (L ₁ / 20−1) × 100 The efficiency of thermal bonding is determined by bending the thermoadhesive elastic yarns in a ring shape and superposing both ends thereof, and performing high frequency bonding at the superposed portion. After using a processing machine (manufactured by Ohira High Frequency Research Institute), set the welder heating temperature to the highest melting point of the threads used for the heat-bonding elastic thread, and perform heat-bonding (welding) in 15 seconds. The length (unit: mm) from which the elastic yarn was removed was measured by cutting at a position 2 mm away from the printing portion and evaluated according to the following criteria. ○ to ◎ are passed.

A: There is no omission. ◯: There is an elastic thread loss of less than 2 mm. X: Elastic yarn loss of 2 mm or more is recognized. The peel strength after heat-bonding was measured by using a heat-bondable elastic yarn as a nonwoven fabric [Sontara # 8103 (DuPont product, polyester 100
%, Melting point 260 ° C.)] and bonded by performing heat bonding (welding) under the same conditions as the above heat adhesion efficiency test, and then peeling test (heat treatment) with a tensile tester (Shimadzu Corporation). Gripping 5 cm of adhesive elastic thread / 5 cm of non-woven fabric at both ends, 1
The peel strength [kg] was measured at a tensile speed of 00% / min) and evaluated according to the following criteria. ○ to ◎ are passed.

◎: Peel strength 5 kg or more ○: Peel strength 1.5 kg or more, less than 5 kg ×: Peel strength less than 1.5 kg The twisting of the ring was as shown in FIGS. Place the ring made on a flat plate,
The twisting degree (mm) was defined as the distance (distance) at which part of the ring floated from the flat plate, and was evaluated according to the following criteria.
○ to ◎ are passed.

⊚: The ring is in close contact with the flat plate as a whole. ○: Part of the ring floats from the flat plate and the distance is 2 mm
Is less than. ×: Part of the ring floats from the flat plate, and the distance is 2 mm
That is all.

[0039]

[Table 2]

As can be seen from Table 2, the thermoadhesive elastic yarns of the examples have good elongation, good thermal adhesive efficiency, and high peel strength. On the other hand, in Comparative Example 1, since the non-elastic yarn C is not used and has a two-layer structure, there is a problem that yellowing occurs over time, and defective products such as cutting errors and uneven cutting occur during cutting. there were. In Comparative Example 2, since the non-elastic yarn B was not used and the two-layer structure was used, when cutting,
There has been a problem that the efficiency of thermal bonding is poor and elastic yarn loss occurs. In Comparative Example 3, since the non-elastic yarns B and C were arranged inside out, the thermal bonding efficiency was poor, and there was a problem that elastic yarn slippage occurred. In Comparative Example 4, since the non-elastic yarn M-1 having no melting point was used in place of the non-elastic yarn B, there was a problem that the non-elastic yarn was not thermally bonded at all.

(Examples 2-a to 2-f) The thermo-adhesive elastic yarns (1) to (6) obtained in the above-mentioned examples are bent in a ring shape and their both ends are overlapped with each other. Using a high-frequency joining machine (manufactured by Ohira High-frequency Research Laboratory), heat-bonding was performed under the welding conditions shown in Table 2 to form rings of heat-bondable elastic threads (1) to (6) (Figs. 3, 4). reference). Nonwoven fabric 14 cm long and 9 cm wide [Sontara # 810
3 (Dupont product, 100% polyester, melting point 2
(60 ° C.)] and then both ends of the heat-bondable elastic yarn (1)
By sandwiching a part of the ring of (6) to (6) and welding the tip of the folded-back portion by welder bonding, six types of nonwoven fabric masks shown in FIGS. On the other hand, the thermo-adhesive elastic yarns (1) to (6) are each bent into a ring shape and both ends thereof are placed on both ends of the non-woven fabric, and the tip ends thereof are welded to the non-woven fabric (shown in FIG. 6). Welding is carried out in the same manner as in (1) above to produce 6 types of non-woven masks shown in FIG.

(Examples 3-a to 3-f) Nonwoven fabric [Sontara # 8103 (product of DuPont, 100% polyester
Made, melting point 260 ° C.)] and cut into apron shape,
The ends of the heat-bondable elastic yarns (1) to (6) obtained in the above-mentioned examples were superposed on the end portions of the six cut non-woven fabrics, and the ultrasonic welder (Japan Product name "BRANSO" manufactured by Emerson Co., Ltd.
N ”) or high-frequency joining machine (made by Ohira High-frequency Research Laboratory)
Was used for heat-bonding under the welding conditions shown in Table 2 to obtain an apron apron, which is a heat-bonded product of the present invention (see FIGS. 6 and 7).

In Examples 1 to 3 described above, LW4000W (high-frequency bonding processing machine manufactured by Quinlite Electronics Co., Ltd.) or TDW was used instead of the high-frequency bonding processing machine.
The same result can be obtained by performing high-frequency thermal bonding using 4003DA (high-frequency bonding machine manufactured by Tokuden Denki Kogyo Co., Ltd.).

[0044]

EFFECTS OF THE INVENTION The heat-bondable elastic yarn of the present invention can be efficiently bonded to each other by heat-bonding, or to a synthetic fiber cloth product, and peels off when it is strained. Hateful. In the heat-bonded product of the present invention, the heat-bondable elastic yarns are efficiently bonded, and when the heat-bondable elastic yarns are strained, the bond is not easily peeled off. Therefore, it is useful as a disposable non-woven mask or non-woven apron.

[Brief description of drawings]

FIG. 1 is an explanatory view showing one embodiment of a heat-adhesive elastic yarn of the present invention.

FIG. 2 is an explanatory view showing another embodiment of the heat-bondable elastic yarn of the present invention.

FIG. 3 is a plan view showing an embodiment of a ring-shaped stretchable yarn made of the heat-adhesive elastic yarn of the present invention.

FIG. 4 is a partially enlarged explanatory view showing a state in which the heat-adhesive elastic yarns of the present invention are heat-bonded to each other.

FIG. 5 is a non-woven mask 1 which is a heat-bonded product of the present invention.
It is explanatory drawing showing an Example.

FIG. 6 is a partially enlarged explanatory view showing a state in which the heat-bondable elastic yarn of the present invention and the synthetic fiber cloth product are heat-bonded to each other.

FIG. 7 is an explanatory view showing an example of a nonwoven fabric apron which is a heat-bonded product of the present invention.

FIG. 8 is an explanatory view showing another embodiment of the nonwoven fabric mask which is the heat-bonded product of the present invention.

FIG. 9 is a cross-sectional view showing a structure of an example of a conventional thermo-adhesive elastic yarn.

[Explanation of symbols]

1 Thermal Adhesive Elastic Thread 3 Ring-shaped Elastic Thread 4 Nonwoven Mask 5 Nonwoven Apron 6 Thermal Adhesive Part A Elastic Thread A B Inelastic Thread B C Inelastic Thread C C ₁ Inelastic Thread C C ₂ Inelastic Thread C 10 Heat-adhesive elastic yarn 31 Neck hanging band 32 Waist stop band 41 Non-woven fabric cut into strips 50 Apron-like non-woven fabric having a chest rest part 51 Chest rest part

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Claims (4)

[Claims] 1. An elastic thread A is used as a core thread, and this elastic thread A is
A thermoadhesive elastic yarn in which one or more non-elastic yarns are sequentially covered from the inside one by one, and the two or more non-elastic yarns are composed of a thermoplastic synthetic fiber. The non-elastic yarn of this book is arranged such that the melting point of the inner non-elastic yarn B is lower than the melting point of the outer non-elastic yarn C. 2. A heat-bonded product obtained by heat-bonding the heat-bondable elastic yarn according to claim 1. 3. A thermal adhesive according to claim 2, wherein the heat-adhesive elastic yarn is a mask using ring-shaped elastic yarns which are superposed at both ends thereof and are heat-adhered at the superposed portion in an ear hanging band. Product. 4. The heat-bonded product according to claim 2, wherein the heat-bonding is carried out by at least one of heating melting, high-frequency melting and ultrasonic melting.