JPH1179559A - Connecting method and device of elastic yarn and connected elastic yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow even unskilled persons to quickly, exactly and uniformly connect many elastic yarns by connecting intersection points consisting of a plurality of elastic yarns in thermal crimping process. SOLUTION: An upper side holding member 1 and a lower side holding member 2 are hingingly and closably supported through a pressure adjusting mechanism 18. The ends of two coiled elastic yarn bodies made of polyurethane or the like are deemed as first elastic yarn 23 and second elastic yarn 24, respectively. The first elastic yarn 23, grasped by one hand, is passed to guides 3 and 4 for restricting the elastic yarn passage of the lower side holding member 2 held by another hand through a specified route and is fixed to the fixing claw 7 of the lower side holding member 2. In the next step, the second elastic yarn 24, grasped by one hand, is passed to guides 5 and 6 through a specified route so that an intersection is formed together with the first elastic yarn 23, and then with the upper side holding member 1 grasped, the first elastic yarn 23 and the second elastic yarn 24 are connected to each other in the process of thermal crimping. In this case, temperature for thermal crimping is adjusted to obtain optimum pressure and a timer is set beforehand so that the electric power supply source for a heater is cut off for a minimum essential time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for joining elastic yarns, and a joined elastic yarn. More particularly, the present invention relates to an elastic yarn joining method capable of joining elastic yarns easily, quickly, accurately, and at low cost, a portable elastic yarn joining device, and a joined elastic yarn.

[0002]

2. Description of the Related Art Conventionally, an elastic yarn wound around a winding body is
When continuously supplying to a processing machine such as a loom, a knitting machine, or a disposable diaper manufacturing machine, a spare wound body is prepared in advance, and the yarn end is manually joined.

As a joining method by a human hand, for example, Japanese Patent Publication No. 46-14584 discloses a method in which two thread-like materials are superimposed in a groove having a bottom having a substantially semicircular bottom in a cross section. Disclosed is a method in which the two thread-like materials are pressed together by a flanger having a tapered tip formed so as to be inserted into the groove and welded by applying ultrasonic vibration to join them together. Have been.

[0004]

A natural fiber typified by cotton, hemp, wool and the like, and an inelastic synthetic fiber typified by nylon, polyester, acrylic and the like can be connected by a piecing device. Elastic yarns represented by polyurethane, rubber, etc., lose their knots or break at binding points due to their inherent properties such as low elasticity, elasticity, and strength. There are many problems with joining using a piecing device used for synthetic fibers, and in reality, there is a problem that it cannot be used in a processing plant in terms of productivity and quality. Therefore, in general, when joining the elastic yarns, a joining method by a human hand is adopted. There is a problem that the properties and the strength of the joints vary.

[0005] Further, in the method described in Japanese Patent Publication No. 46-14584, in which two filaments are welded in a state of being overlapped in a premises, there is an error in the diameter of the filament and the width of the groove. If there is a problem or the amount of elastic deformation of the thread is large, there is a problem that the two threads cannot be reliably welded.

Furthermore, since the two filamentous materials are welded in a state of being aligned, the welded portion becomes longer, causing a problem of uneven weaving and spotting.

The present invention has been made to solve the above-mentioned conventional problems, and has a small number of unskilled persons who have little experience in a fiber processing step, a disposable diaper manufacturing step, and the like in which a large number of elastic yarns need to be bound. It is an object of the present invention to provide an elastic yarn joining method, a joining device, and an joined elastic yarn which can quickly, accurately and uniformly join the elastic yarns.

[0008]

In order to solve the above-mentioned problems, an elastic yarn joining method according to the present invention is a method of joining a plurality of elastic yarns, wherein intersections formed by the elastic yarns are thermocompression-bonded to each other. It is characterized by joining by pressing.

Further, the elastic yarn joining device of the present invention includes a gripping member supported in a hinge-like manner so as to be openable and closable with each other, and a guide for regulating passages of a plurality of elastic yarns to form an intersection with the elastic yarns. And a heater for heating the elastic yarn at the intersection are provided on the opposite side of at least one of the gripping members, and the heated elastic yarn forming the intersection between the gripping members is crimped. It is characterized by the following.

[0010] The joined elastic yarn of the present invention is characterized in that intersections formed by a plurality of elastic yarns are joined to each other by thermocompression bonding.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail.

In the method for joining elastic yarns according to the present invention, intersections formed by a plurality of elastic yarns are joined to each other by thermocompression bonding.

The elastic yarn in the joining method of the present invention refers to polyurethane fibers and the like, for example, spandex fibers and the like are preferably used.

In the joining method according to the present invention, an intersection is formed by a plurality of elastic yarns. As a method for forming the intersection, for example, a method of temporarily fixing one elastic yarn and then overlapping the other elastic yarn to be joined with the fixed elastic yarn to form the intersection is also preferable. Will be

In the joining method of the present invention, the elastic yarns at the intersections are joined by thermocompression bonding.

In the thermocompression bonding in the bonding method of the present invention, a temperature higher than the melting point of the elastic yarn is applied to the intersection to melt the surface of the elastic yarn, and furthermore, the bonding of the elastic yarns to be bonded is made effective. The elastic yarn is deformed by applying pressure.

In the present invention, in particular, in order to prevent the elastic yarn to be joined from being cut by melting or becoming weakened due to thermal deterioration, the time, temperature and pressure at which heat is applied are adjusted. Is appropriately determined according to the polymer composition, fineness, and the like.

According to the present invention, the elastic yarn to be joined can be effectively joined whether it is a multifilament yarn or a monofilament yarn.

With regard to the multifilament yarn to be joined in the present invention, those having a number of constituent filaments generally in the range of about 2 to 230 can be preferably used.

The total fineness of the multifilament yarn and the monofilament yarn is preferably in the range of 10 to 3400 denier. Furthermore, the fineness of the constituent filament yarn in the case of the multifilament yarn is preferably used in the range of 5 to 20 denier.

Further, the elastic yarn to be joined in the present invention may be a raw yarn, a covering yarn or the like.

In the present invention, from the viewpoint of preventing the joint portion of the elastic yarn from being caught and cut in a subsequent step,
After joining, it is preferable to cut off the end of the elastic yarn that is no longer needed.

As a cutting method, a method by heat melting is preferable, but from the viewpoint of preventing adhesion by melting,
It is preferable to apply a temperature much higher than the melting point of the elastic yarn.

Next, the elastic yarn joining device of the present invention includes a gripping member supported in a hinge-like manner so as to be openable and closable with each other, and regulates a path of a plurality of elastic yarns to form an intersection between the elastic yarns. A guide and a heater for heating the elastic yarn at the intersection are provided on the opposite side of the at least one gripping member so that the heated elastic yarn forming the intersection between the gripping members is crimped. It was done.

The gripping member in the apparatus of the present invention is, for example, one in which two gripping members as shown in FIG. 1 are supported so as to be openable and closable in a hinge shape. The shape may be any shape such as a rectangle or a square as long as the elastic yarn to be joined can be pressed.

The material of the gripping member is preferably low in thermal conductivity from the viewpoint of using the heat of the heater efficiently. For example, the thermal conductivity is 7.0 × 10 ⁴ cal /.
sec / cm ² / ° C./cm or less is preferable, and the heat resistance is preferably such that the continuous maximum use temperature is 200 ° C. or more.

As a material of the gripping member, a fluororesin is suitable, and specifically, polytetrafluoroethylene (PTFE) is preferable. This PTFE has heat resistance, can have a continuous maximum operating temperature as high as 260 ° C., and has a thermal conductivity of 6.0 × 10 ⁴ cal / sec /
Since it is as low as cm ² / ° C./cm, it can be suitably used.

Further, it is preferable to be insulative in terms of passing a current through the heater, and it is preferable to have heat resistance in view of withstanding the heating by the heater. As a specific material, Teflon resin or the like is preferable.

In the present invention, the guide for regulating the passage of the elastic yarn is provided to form an intersection between the gripping members. For example, the guide is provided on one gripping member and shown in FIG. As described above, it is preferable to provide the heater around the heater and to provide the intersection of the elastic yarn on the heater from the viewpoint of performing the joining efficiently.

The position where the guide is provided is not particularly limited as long as the intersection of the elastic yarn is formed.

The material of the guide may be any of metal, ceramic and the like.

The heater in the present invention heats to a temperature equal to or higher than the melting point of the elastic yarn. From the viewpoint of efficiently joining the elastic yarns, it is preferable to use a heater having high heat generation efficiency.

Preferably, the heater is covered with a Teflon tape or the like.

That is, this is from the viewpoint of imparting uniform and mild heat to the elastic yarn by appropriately conducting the heat unevenness of the partial heating temperature of the heater by Teflon or the like.

Further, from the viewpoint of avoiding the disadvantage that the elastic yarn is melted in the gripping member other than the portion where the elastic yarn is in contact with the heater, the gripping member is heated more than necessary by the heat of the heater. It is preferable to use a silicone rubber or the like having a low thermal conductivity for a portion in contact with the above.

The heater used in the present invention preferably has a short time to reach a temperature higher than the melting point of the elastic yarn and a short cooling time. In the present invention, a tungsten wire,
Nichrome wire or the like can be suitably used.

The size of the heater may be such that the intersection of the elastic yarns is sufficiently heated.

The apparatus of the present invention is preferably provided with a mechanism for adjusting the thermocompression bonding time. Specifically, as such a mechanism, a timer mechanism or the like for stopping heating of the heater for a preset thermocompression bonding time can be used.

The apparatus of the present invention is preferably provided with a mechanism for adjusting the thermocompression bonding temperature. For example, a mechanism using a thermostat or the like can be used.

Further, the apparatus of the present invention is preferably provided with a mechanism for adjusting the pressure at the time of performing thermocompression bonding. For example, when the gripping members meet and press against each other, the gripping members having one ends connected by a pressure adjusting mechanism can be used.

The pressure adjusting mechanism may be either a mechanism for mechanically adjusting a spring or the like or a mechanism for adjusting the pressure by electronic control.

It is also preferable that a member for cutting the elastic yarn is provided. For example, in order to cut the end of the elastic yarn that is no longer necessary after joining, it is preferable to instantaneously cut the elastic yarn using a cutter or the like.

The size of the apparatus of the present invention is preferably such that it can be operated with one hand of a human in consideration of the operability of one person.

According to the present invention, a plurality of elastic yarns to be joined are gripped with one hand, and the elastic yarn joining device according to the present invention is held with the other hand. The elastic yarn is manually transferred to a guide that regulates the path of the elastic yarn between the gripping members, and an intersection of the elastic yarn is formed, and at the intersection, the one gripping member and the other gripping member described above are formed. The elastic yarns can be joined to each other by performing thermocompression bonding with a human grasping force by a heater provided so as to be associated with each other.

After the joining, the elastic yarn joining device of the present invention can be moved while being carried, and the joining of another plurality of elastic yarns in the same manner can be repeated, thereby significantly improving the working efficiency. it can.

Further, the elastic yarn joining apparatus of the present invention is provided with a mechanism for adjusting the strength of the pressure applied to the thermocompression bonding due to the individual difference in the gripping force possessed by a person when the thermocompression bonding is performed by the human grasping force as described above. , And to apply too much pressure,
It is possible to prevent a phenomenon that the elastic yarn is melted and cut, or conversely, the gripping force is weak and the elastic yarn cannot obtain a sufficient pressure for thermocompression bonding and the joining fails.

Also, by providing a timer function for automatically stopping the heating of the heater in the shortest time necessary for thermocompression bonding of the elastic yarn, the elastic yarn is melted to take too long the thermocompression bonding time. It is possible to prevent the phenomenon of being cut off.

Further, by providing the function of cutting unnecessary yarn ends by another cutting heater adjacent to the heater portion immediately after the elastic yarn is thermocompression-bonded by the above-described method,
After joining the elastic yarns, the joined elastic yarns can be easily released from the elastic yarn joining device, and the transition to another elastic yarn joining operation can be easily performed.

Therefore, when joining the elastic yarn, which is the aforementioned problem, even an inexperienced person with little experience can make the elastic yarn fast,
Since it can be bonded accurately and uniformly, the effect of effectively utilizing human muscular strength and physical strength is obtained.In addition, since a complicated structure is not required in terms of equipment, it can be manufactured at low cost and is extremely cost effective. It will be excellent.

In the elastic yarn obtained according to the present invention, intersections formed by a plurality of elastic yarns are joined to each other by thermocompression bonding, and each elastic yarn has an end cut at one end near the intersection. Having.

The intersections formed by the elastic yarns are preferably formed by crossing the elastic yarns in a cruciform shape in order to sufficiently press-bond the joints. It may be.

Next, the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a schematic view schematically showing an example of an elastic yarn joining apparatus according to the present invention.

FIG. 2 is a schematic view schematically showing an example of a heater section of the upper gripping member of the elastic yarn joining apparatus of the present invention.

FIG. 3 is a schematic diagram schematically showing an example of the power supply unit main body of the elastic yarn joining device of the present invention.

In the elastic yarn joining device, the upper gripping member 1 and the lower gripping member 2 are hingedly supported via a pressure adjusting mechanism 18 so as to be freely opened and closed. The lower gripping member 2 has guides 3, 4, 5, and 6 for regulating the passage of the first elastic yarn 23 and the second elastic yarn 24, and a fixing claw 7 for fixing the first elastic yarn 23; A lower heater 8 is provided for heating the intersection of the first elastic yarn 23 and the second elastic yarn 24 to perform thermocompression bonding.

As shown in FIG. 2, the upper holding member 1 is provided with an upper heater 9 at a position where the upper holding member 1 meets the lower heater 8. The upper heater 9 may not be provided depending on the case.

Further, cutting heaters 10 and 11 for cutting unnecessary yarn ends immediately after the first elastic yarn 23 and the second elastic yarn 24 are joined by thermocompression bonding, Anti-adhesion films 12, 14, 1 that prevent the bonded elastic yarns provided around 8 from adhering to the heater
5 are provided. Similarly, the upper gripping member 1 is provided with the anti-adhesion films 13, 16, 17 as well.

As the upper gripping member 1 and the lower gripping member 2, one end of each gripping member connected by a pressure adjusting mechanism 18 is used to adjust the pressure at the time of performing thermocompression bonding. I have.

Further, as shown in FIG.
And a variable power supply device 20 for adjusting the temperature of the upper heater and the lower heater installed in the power supply unit main body.
A timer mechanism 21 for adjusting the crimping time; and a power cord 2 for supplying power from the power supply unit main body to the holding unit main body.
2 is exemplified. 25 is
The guide 3 provided on the upper gripping member 1 corresponding to the guides 3, 4, 5, and 6 for regulating the passage of the first elastic yarn 23 and the second elastic yarn 24 provided on the lower gripping member 2. 4,
Guide fitting holes for fitting 5 and 6.

[0061]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. [Example 1] As elastic yarn, polyurethane elastic yarn, Operon (R), type 127 (XA), manufactured by Toray Dupont,
Using 840 denier, two windings of the elastic yarn are prepared, and the yarn ends drawn from the respective windings are used as the first elastic yarn 23 and the second elastic yarn 24, and the first elastic yarn 23 and the second elastic yarn 24 are used for the first elastic yarn 24 with one hand. The guides 3, 4, which hold the elastic yarn 23 and hold the elastic yarn 23 with the other hand, are provided on the lower gripping member 2 of the elastic yarn joining device of the present invention and regulate the passage of the elastic yarn. It was passed through a path and fixed to a fixing claw 7 provided on the lower gripping member 2.

After that, the second elastic thread 24 is grasped with one hand, and the above-mentioned guides 5 and 6 of the elastic thread joining device are fixed to the above-mentioned guides 5 and 6 so that the elastic thread 24 forms an intersection with the first elastic thread 23. After that, the upper gripping member 1 was grasped, and the first elastic yarn 23 and the second elastic yarn 24 were thermocompression bonded to complete the joining.

At this time, an optimum thermocompression bonding temperature for bonding the elastic yarn is set in advance, and a timer is set in advance so that the power of the heater is turned off in the shortest time necessary for thermocompression bonding of the elastic yarn. The pressure was set and the pressure was adjusted in advance so that the optimum pressure required for thermocompression bonding was obtained.

When the joining operation of the elastic yarn was repeatedly performed by the above-mentioned method, it was possible to obtain good joining reproducibility. [Example 2] To an elastic yarn, a polyurethane elastic yarn, Operon (R), type 127 clear, manufactured by Dupont Toray,
As in Example 1, two wound yarns of the elastic yarn were prepared using 40 denier, and the yarn ends drawn from each of the wound yarns were taken out of the first elastic yarn 23 and the second elastic yarn. As 24,
A guide 3, which holds the first elastic thread 23 with one hand and holds the elastic thread 23 with the other hand, and regulates the passage of the elastic thread installed on the lower gripping member 2 of the elastic thread joining apparatus of the present invention;
4 through a predetermined path, and was fixed to a fixing claw 7 installed on the lower gripping member 2.

Thereafter, the second elastic yarn 24 is grasped with one hand, and the elastic yarn 24 is formed on the above-mentioned guides 5 and 6 of the elastic yarn joining device so as to form an intersection with the first elastic yarn 23. After passing through a predetermined path, the upper gripping member 1 was gripped, and the first elastic yarn 23 and the second elastic yarn 24 were thermocompression bonded to complete the joining.

At this time, an optimum thermocompression bonding temperature for bonding the elastic yarn is set in advance, and a timer is set in advance so that the heater is turned off in the shortest time necessary for thermocompression bonding of the elastic yarn. Was set, and the pressure was adjusted in advance so that the optimum pressure required for thermocompression bonding was obtained.

When the joining operation of the elastic yarn was repeatedly performed by the above-described method, it was possible to obtain good joining reproducibility.

[0068]

According to the present invention, even inexperienced persons who have little experience in the fiber processing process and the disposable diaper manufacturing process in which it is necessary to bind a large number of elastic yarns, can quickly and accurately produce a plurality of elastic yarns. The elastic yarn can be uniformly joined, the muscle strength and physical strength of a person can be effectively utilized, and the elastic yarn joining device can be manufactured at low cost, which is extremely effective in terms of cost.

[Brief description of the drawings]

FIG. 1 is a schematic diagram schematically showing an example of an elastic yarn joining device of the present invention.

FIG. 2 is a schematic diagram schematically showing an example of a heater section of the elastic yarn joining device of the present invention.

FIG. 3 is a schematic diagram schematically showing an example of a power supply unit main body of the elastic yarn joining device of the present invention.

[Explanation of symbols]

1: Upper gripping member 2: Lower gripping member 3, 4, 5, 6: Guide 7: Fixed claw 8: Lower heater 9: Upper heater 10, 11: Cutting heater 12, 13, 14, 15, 16, 17 : Adhesion prevention film 18: Pressure adjusting mechanism 19: Power supply unit main body 20: Temperature adjusting mechanism 21: Timer mechanism 22: Power cord 23: First elastic thread 24: Second elastic thread 25: Guide fitting hole

Claims (11)

[Claims] 1. A method for joining a plurality of elastic yarns, wherein the intersections formed by the elastic yarns are joined by thermocompression bonding to each other. 2. The method according to claim 1, wherein the elastic yarn is thermocompression-bonded so as not to be cut. 3. An elastic yarn is temporarily fixed, and an intersection is formed by the fixed elastic yarn and the other elastic yarn.
A method for joining elastic yarns, comprising joining the elastic yarns at the intersections by thermocompression bonding. 4. The method for joining elastic yarns according to claim 1, wherein the end of each elastic yarn is cut after joining. 5. A guide comprising a gripping member supported in a hinge-like manner so as to be freely openable and closable with each other, a guide for restricting passages of a plurality of elastic yarns and forming intersections between the elastic yarns, and heating the elastic yarns at the intersections. And a heater for heating the elastic yarn that forms a point of intersection between the gripping members and presses the heated elastic yarn. apparatus. 6. The elastic yarn joining apparatus according to claim 5, further comprising a mechanism for adjusting a thermocompression bonding time. 7. The elastic yarn joining apparatus according to claim 5, further comprising a mechanism for adjusting a thermocompression bonding temperature. 8. The elastic yarn joining apparatus according to claim 5, further comprising a mechanism for adjusting a pressure at the time of performing thermocompression bonding. 9. The elastic yarn joining apparatus according to claim 5, further comprising a timer mechanism for stopping heating of the heater at a preset thermocompression bonding time. 10. The elastic yarn joining apparatus according to claim 5, further comprising a member for cutting the elastic yarn. 11. A joined elastic yarn, wherein intersections formed by a plurality of elastic yarns are joined to each other by thermocompression bonding.