SI8810967A - Method of producing a continuous slide fastener strip - Google Patents

Abstract

The invention relates to a manufacturing process zip strap (1) with weaving on weaving machines with a needle, the threads (2) being of the base of the carrier strip and the connecting threads (3) run so that the fabric and weaving needles (4) introduce threads (5) of weft carrier weft as well as plastic monofilament (6). Weaving needle (4) which is constantly moving from the outer to the inner position, thereby wrap a plastic monofilament (6) around the twist mandrel (7), on which the zippers (8) are formed. In doing so permanently formed from a plastic monofilament (6) string zip ties, which always consist of connecting heads (9) and the legs (11) of the articles (8) zipper, the arms (11) form the connecting lugs (10) and are with the connecting parts (12) also united. At the same time, a series of knuckle clasps with connecting threads (3) as well as weft threads (5) the carrier belt is interlaced to form a carrier belt (13). Tensile stress of incoming plastic monofilament (6) Adjusts with drive inlet cylinders (14a) to engage. Traction tension is also affected movement of the weaving needle (4) so as to maximize pulling stresses in the output position of the needle (4) for weaving, the plastic monofilament (6) being drawn against the twist hook (7). It deals with a bandage (7) with a nearly rectangular cross-section of thickness 10 to 20% smaller than the plastic diameter monofilament, longitudinally on side of connecting heads (9) curved rounding of the edges (15) and a larger width from the thickness by a factor between 1.75 and 3. The pulling tension of the plastic monofilament (6) is dependent from its diameter. External needle position (4) for the weaving is so tailored that the tension in it is drawn position in the plastic monofilament increases by a factor from 1.5 to 3, keeping this voltage plastic monofilament (6) on the twist mandrel (7).

Description

PROCEDURE FOR MANUFACTURING TAPE CARE

FIELD OF THE INVENTION

The invention belongs to the field of consumer goods, more specifically to the field of haberdashery, and more specifically to the field of manufacturing zippers.

TECHNICAL PROBLEM

The technical problem is how to make a high-quality zipper, given the strength of the transverse forces, as well as the resistance to fracture when twisted.

BACKGROUND OF THE INVENTION

The zipper strap consists of a carrier strap and a set of zip ties. For example, it is possible to simultaneously produce two strips that are positioned opposite one another in the function of a zipper, by stringing together a series of zipper joints. The mandrel forming the zipper joint is in this case a long, needle-shaped, freestanding component (DE 25 40 272). However, it is also possible to work with a mandrel that is relatively short and shaped like a hook and is mounted on a movable lever compared to the previous one (EP 0 124

129). In this way, only a single zipper tape is generally made. Another zipper strap, which is intended to be fastened with a zipper, is added at a different location and at a different time. the clasps of the hook-shaped zipper shall be continuously removed from the mandrel or worn off when weaving.

Within known dimensions (DE 25 40 272, EP 0 124 129), sufficiently well-defined zipper joints and sets of zipper joints can be obtained, including the inclination rate. With regard to the design of the coupling heads and the couplings, interfering tolerances should definitely be taken into account. A sufficiently well-designed coupling head cannot be obtained immediately. These tolerances can adversely affect the tensile strength of the transverse forces and the resistance to fracture when twisted and folded. In order to provide a narrower tolerance for at least the coupling heads, it is customary within the known measures to pre-press the coupling heads onto the inlet monofilament of plastic. This has a detrimental effect on the weaving and the speed of the weaving.

DESCRIPTION OF THE TECHNICAL PROBLEM SOLUTION WITH EXAMPLES AND SHORT

DESCRIPTION OF THE ATTACHED DRAWINGS

The invention relates to a method of manufacturing a zipper web by weaving on needle-weaving machines, wherein neither the base of the carrier tape nor the connecting thread is guided to form a fabric. Weaving needles introduce strands of weft carrier tape as well as monofilament of plastic, the weaving needle moving continuously from the outer to the inner position wrapping the monofilament of plastic around the mandrel. A series of zipper knuckles is constantly formed from plastic monofilament, zipper knuckles always consist of connecting heads and attached zipper knuckles. These arms form the connecting ears and are joined to the connecting parts, while at the same time a series of fasteners of the fasteners with connecting threads as well as the weft threads of the carrier belt are connected to form the carrier belt, whereby the pulling tension of the incoming plastic monofilament is controlled by the drive feed rollers. to attract. The pulling tension is also affected by the movement of the weaving needle, such that the maximum pulling tension is in the exit position of the weaving needle, in which the plastic monofilament is pulled against the mandrel.

It is an object of the invention to invent such a process where it is not necessary to pre-press the coupling heads on the monofilament of plastics, producing very accurate fasteners of the fasteners and coupling heads, which ensures high quality, especially with respect to the transverse forces, fracture resistance when breaking they are twisted and folded, and zippers can be made at high speed weaving.

In order to accomplish this task, the invention proposes to work with a twisting mandrel having a nearly rectangular cross-section and a thickness that is 10 to 20% smaller than the diameter of the plastic monofilament and having a longitudinal rounding on the side of the connecting heads and a width greater than thickness by a factor of 1.75 to 3, preferably 2, that the tensile stress in the incoming plastic monofilament is at the weaving site: for plastic monofilaments of about 0.5mm in diameter from 300 to 500 grams, for plastic monofilaments of about 0.6mm in diameter up to 800 grams, and for plastic monofilaments of about 0.75mm in diameter from 800 to 1200 grams, and that the outer position of the weaving needle is adjusted so that in this position of the weaving needle the tension in the plastic monofilament is increased by a factor of 1.5 to 3, wherein the plastic monofilament on the mandrel supports this tension. The so-called wrapping in order to form a coupling head on a set of plastic monofilament zip links is already known in itself. The resulting coupling heads are not very defined in terms of design. In contrast, the invention is based on the realization that improved weaving is possible in the weaving process, on the one hand by the use of a special twist mandrel and, on the other hand, by the provision of special traction stresses when wrapping. The bending hook has a longitudinal bending rounding, which helps to bend, and in addition a predetermined width. This width gives the bending spike a surface moment of inertia that helps the wrapping tension to prevent damage to the spike. The width of the twisting mandrel also defines the connecting eye. This creates connecting eyelets to which are attached connecting heads which are held firmly in the connecting eyelets because of the shape, so that the required strength with respect to the transverse forces and the flexural strength when folded is achieved, and at the same time the eyelet is large enough to engage made from a zipper strap fully demonstrates sufficient, even extreme flexibility. Wrapping tension leads to high speed of velocity, which has a positive effect on design. In accordance with the invention, tension-wrapped coupling heads are stabilized with thermal fixation without disturbing shape changes. It contributes to optimization when the movement of the weaving needle is adjusted in such a way that the pulling tension in the inner position of the weaving needle is increased by a factor between 1.2 and 2.5, with the plastic monofilament supporting the previously formed connecting part surrounded by the threads warp and / or weft. It goes without saying that the weft threads are strong enough, or that the number of basic threads is large enough.

In detail, there are many options for further embodiments and specifications of the process according to the invention. A preferred embodiment of the invention is characterized by the use of a twisting mandrel whose rounding of the edges has a diameter of about half the thickness of the twisting mandrel. Within the scope of the invention, it is possible to use a wide variety of synthetic materials, which are common in the manufacture of zippers with a series of zip ties, and in particular polyamide and polyester materials, for plastic monofilament. The cross-section of plastic monofilaments may be circular. Particularly well-formed coupling heads are produced using a plastic monofilament with a substantially elliptical cross-section where the ratio of diameters is 1: 1.2 to 1: 1.6 (small diameter: large diameter). The weaving is carried out such that, for the connecting heads, the large axis of the elliptical cross section in the zipper strap is parallel to the longitudinal axis. When using a plastic monofilament with an elliptical cross-section, it is advisable to change the cross-section from a circular to an elliptical when feeding it to the cold-rolled plastic monofilament. The internal stresses left by the cold rolling have a positive effect on the wrapping defining the coupling heads. It is understood that when using plastic monofilaments with an elliptical cross section, the algebraic mean of the dimensions of the small and large axes is used instead of the diameter.

Further, the invention will be explained by means of schematic drawings in which h:

Figure 1 shows a top view of the weaving location of a needle-weaving machine equipped according to the method of the invention, showing a section,

Figure 2 shows, in accordance with Figure 1, a top view of another weaving machine,

Figure 3 shows a very enlarged and, in perspective, cross-section through a webbing weave designed to conform to the process of the invention,

Figure 4 shows, in accordance with Figure 3, a plastic monofilament weave after curl,

Figure 5 shows a section in the direction A-A through the object of Figure 4, i n

Figure 6 shows a section in direction B-B through the object of Figure 4.

Figures 1 and 2 show the components of the automatic machine for producing the zipper tape 1 by weaving. Neither the 2 warp straps and the connecting thread 3 are guided to form a fabric. Weaving needles 4 introduce threads of 5 wefts of the carrier belt and, in the embodiment of drawing 1, two plastic monofilaments 6, or in the embodiment of drawing 2 one plastic monofilament 6.

The weaving conditions are arranged such that a plastic monofilament 6 with a weaving needle 4, constantly moving from the outlet to the inlet position, is wrapped around the twist mandrel 7, which forms the clasp. In this case, a series of zipper joints is formed permanently from plastic monofilaments 6, and the zipper members 8 always consist of connecting heads 9 and zipper arms 11. These arms form connecting lugs 10. They are joined to connecting lugs 12, as shown in Figure 4. At the same time, a series of joints are fastened by means of connecting threads 3, as well as threads 5 of the weft carrier belt, to the emerging carrier lane 13. Traction tension of the incoming the plastic monofilament 6 can be adjusted with the drive inlet rollers 14a for tightening. It is also affected by the alternating movement of the weaving needle 4, such that the maximum pulling tension is in the outer position of the weaving needle 4, in which the corresponding plastic monofilament 6 is drawn to the mandrel. In this case, the twist mandrel 7. How it is made can be seen by comparing on one side of drawings 3 and on the other side of drawings 4 to 6. The folding mandrel 7 has an almost rectangular cross-section whose thickness is 10% to 20% less than diameter of the corresponding plastic monofilament 6. On the side of the coupling heads, it has a longitudinal curvature of the edges 15 and a width that is by a factor of 1.75 to 3 larger than the thickness. This gives the bending mandrel a special surface moment of inertia and defines, as shown in Figure 6, the size of the connecting ears 10. Among other things, the tensile stress of the incoming plastic monofilament 6 is adjusted in particular as specified in claim 1. In this context, springs are also important. (14b) for equalizing the voltages, which also affect the supply length. The outer position of the weaving needle 4 is adapted to increase the pulling tension in the plastic monofilament 6 by a factor of 1.5 to 3 when moving outward, with the plastic monofilament 6 resting on the twist mandrel 7, as shown in Figures 1 and 2. The inward movement of the needle 4 of the weave needle is such that, in the inner position of the weave needle 4, the pulling tension in the plastic monofilament 6 is increased by a factor of 1.2 to 2.5. Here, the plastic monofilament 6 supports a preformed connecting piece 12 that surrounds the threads (2) of the base of the carrier belt, the connecting threads 3 and / or the threads of the weft of the carrier belt.

In the case of a preferred embodiment of the invention, the twist mandrel 7 has a bend circumferential edge 15 radius equal to about half the thickness of the twist mandrel 7. The result of the actual wrap around

8 of the invention is shown in Figures 4 and 5. Highly defined coupling heads 9 are formed upon deep and effective closure with the shape. As shown in Figure 4, axial ratios in the range of 1: 2.6 to 1: 3.6 can be achieved in the coupling heads 9, depending on the shape of the mandrel and the pulling tension. At the same time, Figure 5 shows the indicated axis ratio of the plastic monofilaments 6 when they have an elliptical cross section.

Claims (5)

PATENT APPLICATIONS A method for making a zipper tape (1) by weaving with needle-weaving machines, the threads (2) of the base of the carrier tape and the connecting thread (3) being guided to form a fabric and to use weaving needles (4) introduce strands (5) of weft carrier tape as well as plastic monofilament (6), the weaving needle (4) constantly moving from the outer to the inner position wrapping the plastic monofilament (6) around the twist mandrel (7) of the zipper (8), so that a series of zipper knuckles is always formed from the plastic monofilament (6), which always consists of connecting heads (9) and zipper arms (11), the spokes (11) forming connecting zipper (10) and are joined to the connecting parts (12), while at the same time a series of fasteners of the fastener with connecting threads (3) as well as threads (5) of the weft are interlaced to form a support band (13), thereby drawing the plastic tension the monofilament (6) is adjusted by means of the drive inlet rollers (14a) for clamping, thereby affecting also moving the needle (4) for weaving in and out, in such a way that the maximum of the tensile stress in the output position of the weaving needle (4) is generated, while the plastic monofilament (6) is drawn against the twist mandrel (7), to work with a twist mandrel (7) having a nearly rectangular cross-section with a thickness of 10 to 20% less than the diameter of the plastic monofilament (6) and having a longitudinal bend around the edges (15) and a width on the side of the connecting heads (9) , which is greater than the thickness by a factor between 1.75 and 3, that the tensile stress of the inlet plastic monofilament (6) having a diameter of about 0.5 mm in the range of 300 to 500 grams, in the case of plastic monofibre (6) with a diameter of about 0 , 6mm from 500 to 800 grams, and for plastic monofilament (6) with a diameter of about 0.75mm from 800 to 1200 grams, and that the outer position of the weaving needle (4) is so adjusted that the tensile stress in the plastic monofilament (6) is increased by a factor of 1.5 to 3, wherein the plastic monofilament (6) on the twist mandrel (7) is below it breaks this tension. Method according to claim 1, characterized in that the movement of the weaving needle (4) is adjusted in such a way that the tension in the plastic monofilament (6) is increased by a factor of 1.2 in the inner position of the weaving needle (4). to 2.5, wherein the plastic monofilament (6) supports a preformed connecting portion (12) surrounding the weft threads (3) and / or weft threads (5) carrying 1 care of cancer. Method according to one of Claims 1 or 2, characterized in that it is operated with a twisting mandrel (7) whose longitudinal twisting edges (15) have a radius corresponding to about half the thickness of the twisting mandrel (7). Method according to one of Claims 1 to 3, characterized in that a plastic monofilament (6) having an almost elliptical cross-section is used, with an axis ratio in the range from 1: 1.2 to 1: 1.6 ( small axis: large axis). 5. A method according to claim 4, characterized in that the cold-rolled plastic monofilament (6) receives essentially an elliptical cross-section while feeding it to the weaving needle (4).