JPS63185783A - Joining of flexible fiber strand - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to bonding techniques for flexible fiber strands, such as yarns for use in textile processing.

Traditionally, in the textile processing industry, when using natural or synthetic fiber yarns for carpet manufacturing, weaving, or knitting, the yarns are bonded and joined together without disturbing the appearance while maintaining the tensile strength of the yarns. There was a problem in forming the .

Known methods for interconnecting yarn ends include:
Examples include wrapping, adhesive method, welding method, mechanical splicing method, electrostatic splicing method, and pneumatic splicing method. Details of the principles, practices and advantages of using the splicing method on carpet yarns have been published by Schlafburst of West Germany in the Journal of Carpet Manufacturers International, 2/1985.

In the section on the glue method (glue+g) in this miscellaneous text, it is described that yarns are overlapped and bonded to each other with an adhesive. Although this produces a bond of good strength, its disadvantages are that it requires a long drying time, that the joint becomes rigid, and that the joint becomes thick. The welding section of this miscellaneous text also describes the use of this method with synthetic nylon fibers.

The aim of the invention is to overcome at least some of the drawbacks of the conventional methods mentioned above.

That is, in the present invention, a heated thermoplastic adhesive is placed on the ends to be joined, and both ends are abutted and joined to maintain a constant thickness of the strand and to allow the adhesive to soak into the fibers at the ends. A method for joining flexible fiber strands is provided, which comprises rolling the abutment, thus producing an improved joint.

The flexible fiber strands may be yarns, ropes, twines, or cords.

In a preferred embodiment of the invention, a hot melt polyamide adhesive is placed on the ends of the yarn to abut the yarn ends together, and the abutted areas are rolled to maintain a constant yarn thickness and bond. The agent penetrates into the fibers of the yarn, thus creating an improved bond.

The invention also provides guiding and gripping means for guiding and holding the strand ends, cutting means for matching the ends together, means for applying a predetermined amount of hot melt adhesive to the ends, Means for moving the ends into abutment against each other so as to penetrate into the fibers of the yarn ends and for rolling the joint to equalize the diameter so as to produce an apparent consistent joint in the strands. The present invention provides a device for joining ends of flexible fiber strands, characterized in that it is provided with means for joining ends of flexible fiber strands.

Further features of the present invention will become apparent from the description below.

The technique of joining yarns according to the present invention will be described below with reference to the accompanying drawings.

Figure 1 is a partially exploded schematic perspective view of the yarn splicing device seen from one side, and Figure 2 ■, ■, ■, ■, and ■ schematically show the five steps accomplished by the yarn splicing device in item numbers. It is an explanatory diagram.

In the following, the invention will be described with reference to the application of flexible fiber strands as yarns, but with slight modifications it can also be applied to the joining of ropes, tow-ins or cords.

The yarn splicing device shown in FIG. 1 can be held by hand, and its base and handle are omitted from the drawing.

The splicing device has a pair of guides 1, 2 on which the yarn ends 3.4 (only shown in FIG. 2) are placed. The ends of the yarn are gripped by grippers 5.6 mounted on the support 7. As shown in step (2) in FIG. 2, the portions 5 and 6 of the grippers 5 and 6 engage the slots 8.9 of the guides 1 and 2 to hold the yarn ends 3 and 4. Preferably, the yarn guides 1, 2 are slidable over the member 10 to assume the correct position for the step of FIG. It is preferable to wear it.

In this embodiment, the cutters are a pair of blades 11 mounted within a housing 12 that can reciprocate on rails 13. This cutting process is shown in Figure 2 (■). The rear blade 11, which has been cut so that the yarn ends 3 and 4 match, is shown in Fig. 2 from the cutting position.
Move to the position shown.

The guide 1.2 is then moved a little apart to the position shown in FIG. 2 (2). In this position the ends of the yarn are separated for step 1 of the splicing operation.

The step (3) in FIG. 2 is a step of applying a hot-melt adhesive to the ends of the yarn. Adhesive is supplied to the adhesive applicator 14 via tube 13 from a storage container (not shown). Adhesive applicator 14
can be reciprocated on a guide 15 and includes a heater 16 which melts the adhesive when it is applied between the yarn ends 3.4.

When the adhesive applicator 14 is retracted to the position shown in FIG.

In this state, as shown in FIG.
) is rubbed between the members 18. This movement of the arms brings the rubbing members 18 into contact with each other and serves to roll and even out the joint, allowing the molten adhesive to penetrate into the fibers making up the yarn. Once the rubbing operation is complete, member 18 is automatically retracted.

The invention can be used to bond wool yarns for carpet production, weaving or knitting.

The yarn ends to be joined are first trimmed by the blades 11 to form similar shapes so that they complement each other when joined abutment.

The thermoplastic adhesive is preferably a hot melt polyamide resin. The polyamide resin is preferably heat resistant so that the yarn after bonding can withstand processing at temperatures above ambient temperature. In addition, a fast-curing resin is selected as the resin. For example, the softening point is 185℃ (
by ring-end-ball method), viscosity (voids)/
Temperature (g) approx. 40/21o, tensile strength kg/ff1
) 130 and elongation (96>250) are preferred.

The ends of the yarn are dipped in resin or a small amount of resin is applied to the ends, which soaks into the entangled fibers that form the yarn.

The butt-jointed ends are rolled so that the thickness of the joint remains the same as the thickness of the yarn, so that the joint is formed with no noticeable changes in the yarn. .

During use, the joint has high tensile strength and yarn deformation is kept to a minimum.

Thus, the present invention provides a method for yarn end joining using hot melt polyamide resins.

[Brief explanation of the drawing]

Figure 1 is a partially exploded schematic perspective view of the yarn splicing device seen from one side; Figure 2; It is a diagram.・In the figure, 1 and 2 are guides; 3 and 4 are yarn ends; 5° and 6 are grippers; 8 and 9 are slots; 10 is a member; 11 is a blade; 12
13 is a tube; 14 is an adhesive applicator; 15 is a guide; 16 is a heater; 17 is a joint; 18 is a rubbing member; 19 is an arm. Tesodo FIGJRE 1

Claims (1)

[Claims] 1. A heated thermoplastic adhesive is placed on the ends of the strands to be joined, and both ends are brought into contact with each other to maintain a constant thickness of the strands and the adhesive adheres to the fibers at the ends. A method of joining flexible strands, characterized in that the abutting joints are rolled with a roller so as to penetrate into the joints, thus producing an improved joint. 2. Place hot melted polyamide adhesive on the end of the yarn,
The yarn ends are abutted together and the abutment is rolled to maintain a constant yarn thickness and allow the adhesive to penetrate into the fibers of the yarn, thus creating an improved yarn bond. The method according to claim 1. 3. The method according to claim 1, wherein the thermoplastic adhesive is a polyamide resin. 4. guiding and gripping means for guiding and holding the strand ends; cutting means for making the ends match each other; means for applying a predetermined amount of hot melt adhesive to the ends; means for moving the ends into abutment against each other so as to penetrate into the fibers of the strands, and means for rolling the joints to equalize the diameter so as to produce an apparent consistent joint in the strands. A device for joining ends of flexible fiber strands, characterized in that: 5. The device according to claim 4, wherein each member is assembled in such a way that it can support or hold a storage container of polyamide resin as an adhesive with a hand connected thereto. 6. The guiding and gripping means are mating members mounted in such a way that the mounting members can be slid relative to each other and the ends can be held for cutting, gluing and rolling. Apparatus according to paragraph 4 or 5. 7. The apparatus according to claim 6, wherein the adhesive application means and the cutting means are sequentially reciprocated with respect to the mounting member. 8. The mounting member supports a pivot arm on which a scraping member or a roller member is mounted.
Apparatus described in section.