Slider for a plastic fastener tape

The invention relates to a slider for a fastener tape. It concerns also a Fastener tape having such a slide and a bag, preferably made of Plastic, with such a fastener tape.

Such slide and fastener tapes, also known as moldings or closures Sliding closure strip or strips may be referred to, are already known. Most of the known slide individually by injection molding generated and then by means of complicated devices automatically individually the slide fastener tapes applied. In most of these sliders, it is necessary that they called Rütteltöpfe - aligned in the mounting direction - Are supplied to a device which spreads open the slider and then him the previously opened fastener tape astride imprints.

Such a device is known for example from DE-PS 31 36 075.. Here the slides are sequentially fed to a rotor, which the top of the slider detected while the side panels (wings) of the slider in a spread stator slowly and then through the rotor to the slide fastener tape be postponed.

Other systems use complicated foldable slider whose side parts (wings) positioned horizontally and folded like a hinge when mounted on the tape will. Such a slider is known from PCT / WO 95/35057.

All these methods have the disadvantage that one hand the slide preparation is costly and on the other hand the mounting of the slider complicated facilities requires, which are very susceptible to interference and only a relatively slow production allow.

From DE-PS 16 32 574 slides and a method for their application , in which the U-shaped slide on slide fastener strips astride be placed. The one continuous band forming fastener strips gradually moved away, and it is in each case a slider at rest fastener tape pressed by a plunger onto the tape.

The DE-OS 21 01 875 describes an apparatus for applying sliders complementary locking elements, which intermittently to the apparatus push past, wherein each of an endless chain of elastic sliders a slider is pushed out of the chain on the tape. The slide-side parts (Wing) are resiliently flexible, so that, after slight spreading and pressing spring back and the closure tape comprise functional. With this Method is a low-noise production at relatively high speed possible. A substantial disadvantage, however, is that the slide due to their small size by consumers will only be accepted conditionally. they are not very handy and can with rough handling of the fastener tape be torn down. A further disadvantage is that these slides cross only at the front of a very short arrow-shaped heart with inward have edges. These edges prevent by holding the profile parts of the Fastener tape withdrawing the slider upwards, this only in front Thirds of the slide. At the end of the slider are indeed on the side parts small, inwardly directed edges which the closure tape from the outside should include and prevent withdrawal or tipping of the slide. These Edges are however so short that they even at low power over the profile can slide the fastener tape and the slider then back in his Part tilts upward. Thus, the locking function of the slider is not then given more.

The object of the invention is to provide an improved slider for a fastener tape propose.

This object is solved by the features of claim 1. The slide, which preferably made of plastic, comprising a core, two to each other ongoing internal surfaces and two supporting flanks. The slider may have a substantially having U-shape. In this case, it consists of a base part and two adjoining side parts or wings. The fastener tape preferably made of plastic, generally comprises two parts or sub-bands with profiles that can engage. The slider is used to sliding or donating mating and unmating of the fastener tape or of the interlocking profiles or parts. Successive at current Inner surfaces of the slider, the engaging parts of the fastener tape moved toward each other. This is achieved by decreasing Distance of the inner surfaces of the slider. At one end of this interior surfaces the core is provided through which the interengaging parts at a distance being held. At the other end of the inner surfaces of the slide are the Supporting flanks provided. In this area, the interengaging parts together; the fastener tape is entangled or closed.

According to the invention is in the area of ​​the inner faces of the slide a further Centerpiece provided. This is preferably a relatively small heart or a heart, which is smaller than the actual heart. The other core located between the inner surfaces of the slide. It also is located between the actual core and the supporting flanks. The more heart keeps with its side flanks the two profile parts the slide fastener tape certainly until the middle part of the slide firmly and prevents tilting of the slider-end upwards. According to the invention the slide fastener tape halves are firmly guided by the middle of the slide and maintained; they are then taken from the narrower end of the slide. On the now closed fastener tape of the slide is then still held by the smaller support flanks. If the side parts of the slider bent by a force, for example by pulling or slightly apart should be, tipping the slide at its end is up prevented because the additional core in the center of the slider, the fastener tape holds.

The invention provides a slide valve is provided with which the above-indicated Disadvantages can be avoided. The slider has a handy Size. He is nevertheless easy to manufacture in chain, so that a fast low-noise Production is made possible. By the invention, the disadvantage of the prevents slight tipping of the slide in the rear part by two separate Crossings are arranged with guide flanks succession. also is necessary for the functioning of the slide bending elasticity of the respective Plastic used defined. Finally, the invention comprises a Improvement of a method for applying an endless chain of sliders a sliding fastener tape.

Advantageous developments are described in the subclaims.,

Preferably, the other core is connected to the other core. The connection is preferably by a web. It is advantageous for a provide thin web.

According to a further advantageous development are at the top of the slide Papers provided. When the slider has a U-shape, are the essays preferably on the base part, namely at the side walls or wings opposite side of the base part. The essays are used to Spreading or pre-spreading of the slide on the application of the slide a fastener tape.

The slide is preferably made of HDPE, ie of high density polyethylene (High density polyethylene). HDPE can be with high-pressure polyethylene (Low density polyethylene, NDPE) from the produced most pockets or bags are easily recycled, but also with polypropylene, from the increasingly more Bags and fastener tapes are produced.

The invention further relates to a closure tape, preferably made of plastic, which having a slider according to the invention, and a bag, preferably made of Plastic, which is characterized by an inventive fastener tape.

Embodiments of the invention will be described below with reference to the accompanying Drawing explained in detail. In the drawings<dl tsize="6"><dt>Fig. 1</dt><dd>a slider according to DE-OS 16 32 574 a perspective view</dd><dt>FIG. 2</dt><dd>a slider according to the invention in a plan view from below,</dd><dt>Fig. 3</dt><dd>the slider of FIG. 2 in a view from the front (in the Fig. 2 side shown on the left of the slider)</dd><dt>Fig. 4</dt><dd>a section along the line AA in Fig. 2,</dd><dt>Fig. 5</dt><dd>a modified embodiment in which the other smaller Heart not by a web with the first major heart connected is,</dd><dt>Fig. 6</dt><dd>the slider of FIG. 2 to 5 in a plan view from above, </dd><dt>Fig. 7</dt><dd>the pusher and a plunger, wherein the plunger in the retracted Position is and</dd><dt>Fig. 8</dt><dd>the pusher when pressing the slider on the fastener tape.</dd></dl>

The FIG. 1 shows a slide of a known type in a perspective view. The slide 30 is designed substantially U-shaped. It has a base part 6 and two thereof protruding side parts 4 and 5, also known as wings can be. The inner surfaces 31, 32 of the side members 4, 5 run to another. Your distance from each other is reduced in a direction of the direction is the arrow 33 opposite.

At one end of the inner surfaces 31, 32, a core 1 is arranged. It is itself, at that end of the slider, at which the distance of the inner surfaces 31 32 is the greatest. The downward arrow-shaped configured centerpiece 1 has lateral edges 2, 3 which together with lower edges of the side walls 4, 5 and the side walls 4, 5 and respective side walls of the Frog 1 form separate inlet ducts for the closure profile members.

At the other end of the inner surfaces 31, 32 support flanks z are provided, which by the inner surfaces 31, 32 protrude inwardly and which together with the inner surfaces form an outlet channel.

The slide 30 is pushed down on a fastener tape. give this the side walls 4, 5 to the outside, until the fastener tape in the Thumb. In this position, respectively a closure profile passes through a the two inlet ducts on both sides of the frog 1. At the other end the slider through the locked or assembled fastener tapes through the outlet channel.

In the slider of the known type shown in Fig. 1, the edges 2, 3 of the Frog 1 only briefly. These flanks 2, 3 hold the slider along with the edges of the side walls 4, 5 in its front part on the sliding closure profile firmly. The other, the centerpiece 1 opposite end of the slide is tapered and presses the two closure profile parts when moving the slide So that then closes the closure tape in the direction of arrow 33 along is. As the slider is in the opposite direction (against the direction of Arrow 33) separates the core 1, the two closure profile portions for opening the Closure.

The rear, the core 1 remote part of the slide 30 is in the fastener tape only by short edges or support edges such that the side parts 4 and 5 protrude inward, detained. As a result, the slider 30 at this slip point by stretching the side parts 4, 5 over the closure profile and tilt upwards, leading to a malfunction.

Figures 2 to 6 show a slider according to the invention. As apparent from Fig. 2, is there another (second), smaller core 7 Available, located between the front (first, actual), larger core 8 and the rear End of the slide is. The other core 7 is further between the inner surfaces 31, 32. It has outwardly facing supporting edges 12, 13. Further, the second core 7 with the core 8 is formed by a thin Steg 24.

The outer ends of the support flanks 16, 17 of the heart piece 8 are of the inner Ends of projecting from the side walls 20, 21 inside the support flanks 18, 19 spaced. This are slots 9, 10 for the halves of the fastener tape educated. are at the heart of the 8 opposite end of the slide Support flanks 14, 15 provided, which project from the inner surfaces 31, 32 inward. The inner ends of the support flanks 14, 15 are spaced from each other, thereby forming an opening 11th

During operation run the two fastener tape halves of the slide fastener tape , separated by the two slots 9, 10, when the spool of the direction in is the arrow 33 moves. The closure tape halves are in the thinner rear part the slider closed. They occur as a closed shutter of the opening 11 out.

The more, second smaller core 7 holds with its side flanks 12, 13, two profile parts of the sliding fastener tape certainly until the middle part opposite the slide firmly and prevents tilting of the core 8 Caliper end upwards. The slide fastener tape halves are in accordance the invention led to the middle of the slide firmly and maintained; you will be then taken over by the narrower end of the slide. On the now closed the slide fastener tape then the smaller support flanks 14, 15 is maintained. Should one then by pulling the side parts 20, 21 of Slide apart bend slightly and threatens the slide at its heart the abzukippen 8 end remote upwards, yet holds the other smaller Core 7 in the middle of the slide this slider to the fastener tape firmly.

In Fig. 3 you can see the slide according to FIG. 2 from the front (from the slots 9, 10) out, so at the inlet of the closure tape halves. The support flanks 16, 17 the centerpiece of 8 hold the fastener tape halves from the inside, while the support flanks 18, 19 of the sidewalls 20, 21, these fixed externally on the slide hold.

As can be seen further from Fig. 3, at the upper part of the slider, so to its Base part 6, attachments 22, 23 which has a rectangular essentially have cross-section which is somewhat rounded at the corners, however. These Articles 22, 23 are used for pre-spreading of the slide by a ram as shown in Figures 7 and 8. FIG.

FIG. 4 shows a section along the line AA in FIG. 2. The core elements 8 and 7 are joined together by a thin web 24th

In the embodiment 5 shown in Fig., The modified key pieces are 8, 7 are not connected by a web, but separated from each other. This embodiment has the advantage that material is saved and that the side parts spread apart easily when coiling the slide.

Fig. Figure 6 shows the spool in a plan view from above. In addition to the closure strip entry openings 9, 10 one sees the support flanks 16, 17 of the (first, actual, larger) frog 8 and the outer, smaller support flanks 18, 19 of the Side panels 20, 21. On (middle, smaller) other core 7, the support flanks 12 to see. 13 The base part 6 has openings 34, 35th To the End of the slide from which emerges the closed slide fastener tape, located on the side panels 20, 21, the small support flanks 14, 15th

Figures 7 and 8 show the interaction of the slider with a stem 26 for expansion of the slide. The plunger 26 has projections 27, 28, which are spaced apart. The mutually facing surfaces of the projections 27, 28 are inclined to one another, in such a way that the distance between these surfaces increases with increasing distance of the tappet 26 enlarged. In this way, by the mutually facing inner surfaces of the Projections 27, 28 is a conical recess formed.

In the position shown in Fig. 7, the projections 27, 28 of the ram 26 of the articles 22, 23 of the slide apart. For coiling of the slide on the fastener tape, the distance between the slide and the plunger 26 is reduced until the position shown in Fig. 8 is reached. When the rise Plunger 26 engage the inner surfaces of the projections 27, 28 on the articles 22, 23rd This produces a pressure on the articles 22, 23 is exerted, the these articles 22, 23 then in the manner shown in FIG. 8 example, moved toward each other. Thereby to spread the side walls 20, 21 of the slide in the manner shown also in FIG. 8 Something on, so that the slide easily to the closure tape can be pressed. jump through the bending elasticity of the slide, the side walls 20, 21 after the impression back; they then comprise the closure tape.

Of considerable importance for the trouble-free application of the invention Valve is its bending elasticity. For one of the slide must after resile spreading back to its starting position, on the other hand restricts this Spreading not go too heavy. Further, the valve body must at Spreading and for a long time thereafter not be brittle. He may also not crack. Finally, the slide is along with the sealed bag and the slide fastener tape to reuse (recycle) blank.

In order to achieve this must be the material of the same or similar basic material exist as the bags or the bag from which the sliding closure Bag is prepared. A particularly suitable plastics material is high density polyethylene (High density polyethylene HDPE) connected to high-pressure polyethylene (Low density polyethylene, NDPE), from the most bags or bags are produced, can be recycled well. More and more, the bag and the closure tape made from polypropylene. Even with this material together can be recycled, the slider from HDPE, ie ground and reuse. Such a material is for example a HDPE of Borealis A / S with a melt flow rate of 12g / 10 min, and a Shore hardness of 62nd

The Biegeelastitzität of the slider has been studied by numerous experiments and can for example be defined as follows: Experiments on the slider-end, starting Measured from an end opening on sprayed 20-piece extruded from 0.45 to 0.60 mm the free passage including the outer small support flanks 14, 15th

A slider is at its two molded connection sides of the chain secured by two clips on a spring balance and the tensile test, the end opening the slide as far charged that it is external to the profilumgreifenden Support flanks 14, 15 on the strength of the fastener tape, 1,8 mm, opens. This requires a tensile stress between 700 to 1300 grams. After completion the tensile load is carried on the slide, a provision of the end opening by its Elasticity at 0.9 to 1.0 mm.

The slide is now permanently operational, ie, it opens and closes the safely without becoming brittle or tearing fastener tape. He then has an end opening of about 1.8 mm, minus profilumgreifende outer support edges of each ca. 0.4 mm, that is about 1.0 mm, and the closing pressure continues permanently.