DE2160725A1 - Hem tape and braid for upholstery, protective covers and the like - Google Patents

Description

One of the hitherto generally used hems is given by twisting or pressing one or more strips of tissue or crepe paper or the like. a band-like one Shape of approximately circular cross-section. However, such tapes tend to peel or come apart and are therefore often coated or partially coated impregnated with an adhesive, a binding agent or a glue-like material to thereby preserve their tape-like shape. A twisted paper hem tape or bumper tape is in U.S. Patent 2,282,158.

Twisted and compressed paper hem tapes however, they lack the desired elasticity and they feel hard to the touch. In addition, they are not flexible to the desired extent in the transverse direction and are subject to repeated bending

tin Licht, Dipl.-Wfrtsch.-Ing. Ax! Hansmann, Dipl.-Phys. May be

Patent attorneys Dipl.-Ing: Martin Licht, Dipl.-WFrtsch.-Ing. "AxelTlaTismann, Dipl.-Phys. Sebastian Herrmann

OppenauerBOro! PATENT ADVOCATE DR. REINHOLD SCHMIDT

the butt hems or edges on upholstery items or protective covers are easy to destroy,

Other hems or decorative edges or strands or Pintucks were made by stuffing a folded strip of fabric with fibrous cushioning material or wadding material, whereupon the stuffing material was in the fold of the fabric strip is pressed together and the flap-like edge zones of the enveloping fabric strip are sewn together were so that the fibrous padding material or wadding material tightly or tightly wrapped within the Crease of the fabric strip was held in its compressed state, as described in U.S. Patents 1,370,690 and 1,846,369.

Pressed tapes of paper are often braided or wrapped strands to keep them compressed in a ribbon-like shape, such as this in U.S. Patents 1,821,582, 2,107,467, and 2,557 3 ^ 3 is shown.

The outer braid around the compressed paper tape brings but to serve an undesirable increase in the cost of Saumbandes with it, without any other useful purpose, as the compressed · Paper prevent it to W to open or falling apart. The braid also tends to. To release "peeps through" on the surface of the thin tissue in which such tape is wrapped.

It is also known that a braided or spun protective cover is dohnbar in the longitudinal direction and in Has no inherent dimensional stability in the longitudinal direction, as is described in US Pat. No. 2,344,181. If a fluted coating that has a solid cylindrical Body surrounds, is pulled lengthways, s © he pulls himself

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ORIGINAL INSPECTED

radially together, and if the body is relatively hard within such a Umfleohtung, as this for example is the case with a compressed paper tape, then causes a tensile force in the longitudinal direction on the braid only that the braid over the body located in it is tightened.

There are also hem or bumper tapes known from Stretched, cell-like, thermoplastic synthetic resins exist, as for example in the USA patent 2 932 121 are shown. However, these hem bands have the Disadvantage that they lack dimensional stability in the longitudinal direction, a stable behavior that is common to hems and strands or Tucks to maintain the shape of the padding and the Schoniiber cover is desirable, as well as to facilitate the sewing of the tape into a bevel cut Litz cloth or braided cloth and the sewing of the braid or braid to form connecting strands of flat pieces of the end product.

Furthermore, the production of such stretched, cell-like thermoplastic synthetic resin hem tapes or braids are also associated with a manufacturing problem, since the The resulting tape lacks dimensional stability in the longitudinal direction.

The invention is thus concerned with hem bands, .Saumborten and bumper bands as well as strands or «, tucks for upholstered furniture, covers, decorative purposes, lampshades, handbags, items of clothing, etc. Such hem bands or bumper bands usually consist of a band with an approximately circular cross-section whose diameter 2.5 nm on the, 5, 6 mm or 9 mm, or more or less deviates from these measurements, and this tape is ndzonen in the fold of a folded strip of bias cut cloth whose R _a or tabs extending from the end bead 6 mm, 9 mm, 13 mm od _or the like. parallel to each other extending radially outwardly, enveloped, worauf-

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towards the edge zones or flaps sewn together with a series of stitches that are close to the wrapped band. This creates a braid or braid with a sewn-in flap or flange created, which is then between the inwardly turned edges of adjacent surface parts of the upholstery or the Sohon cover or the like is sewn in, so that a slightly protruding, bead-like edge or hem along the connecting lines between the adjacent fabric surfaces or Surfaces of a different material are created from which the upholstery or another product is made.

The aforementioned disadvantages of the known hem bands or bumper bands are now eliminated with a flexible and non-stretchable hem band or bumper band for upholstery items, protective covers, decorative purposes, lampshades, etc., which has a central core of high tensile strength made of many fine and approximately parallel glass fibers and an extruded cell-like synthetic resinous body of low density and tensile strength which surrounds, tightly envelops and adheres to the core so that there is generally no slippage or sliding between the core and the glass fibers. The synthetic resin body has a specific density of about 0.25 to 0.35 g / cm ³ and is generally dimensionally stable and elastically compressible in the radial direction when fully restored . consists of a folded strip of cloth, in the fold of which the above-mentioned hem tape is tightly enclosed, as well as of two edge zone layers of the strip extending in the radial direction, which are sewn together very close to the tape, _etc.

According to a preferred exemplary embodiment of the invention a thermoplastic synthetic resin, for example polyethylene, which contains an inflating or blowing agent (or expansion agent) and an activating agent (or catalyst),

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under pressure and at a suitable plasticizing temperature extruded through an extrusion die which has a circular or oval or other suitably-shaped outlet opening the diameter or size of which corresponds to the resulting hem band, with a yarn-like bundle from a multitude of parallel fine glass fibers duroh the center of the extrusion mold is conveyed (with the help of a suitable Thread guide or a suitable thread carrier), at the same time as the pressurized supply of the hot plasticizing synthetic resin to extrusion mold. When exiting the mold opening, the polyethylene expands a low density tape body of cell-like shape, which the desired enlarged diameter or the desired size has a core consisting of una'ffus glass fibers tightly surrounds and envelops in its center. When the product extruded in this way is cooled to ambient temperature is, the result is an extremely flexible and generally inextensible tape, which is dimensionally is stable, and its cell body has a very low density and adheres to the central fiberglass core in such a way that that there is generally no sliding or slipping between the core and the cell body. The resulting band can be bent into relatively sharp bends bend without adverse effects, and it has a suitable elastic or resilient compressibility in the radial direction, due to which it is more desirable Wise feel and can be bent repeatedly without to be destroyed by it.

The invention is explained in more detail below using the exemplary embodiment shown in the drawing * Show in the newspaper:

Figure 1 is a perspective _e Ausloht a small piece of tape, in accordance with an Au · guide die, wherein

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about the natural size with regard to the diameter is shown,

FIG. 2 is a perspective view of an assembled tape reel of FIG. 1 smaller than that of FIG Natural size is present, with a small portion of the tape on a greatly enlarged scale is shown and part of its fiberglass core is to clarify the representation on the Cell body of the ligament is scattered out and freed from this cell body, and

Fig. 3 is a perspective partial view of the Ljtze or

Braid containing the above hem tape, on an enlarged scale.

In the embodiment shown, the band is generally designated by 4 and has a main body 5, the consists of an extended, cell-like synthetic resin of low density and tensile strength and has an approximately circular cross-section, its diameter between 2.5 and 12 mm. can vary more or less, as well as a compact, coaxial core 6, the sioh is located approximately in the middle of the body 5, a ratio » has a moderately large overall diameter and high tensile strength. The core 6 is a compact yarn web or bundle for example parallel, fine glass fibers, which are preferably provided without any twist or with only a slight twist are * The effective or equivalent diameter of the core 6 can be in the range between 0.125 and 0.6 mm Cell body 5 tightly encloses the core 6 and adheres to it in such a way that the core and the body do not slide takes place.

The body 5 of the band 4 can be made of a polyethylene or another suitable thermoplastic synthetic resin. A suitable small proportion of a propellant or expansion agent and a suitable small proportion of an activating agent or catalyst is sugeaetat and polyethylene

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ORIGINAL JNSPECT-ED

mixed with him.

The mixture of polyethylene, blowing agent and activating agent is heated in a screw extruder whose barrel is heated. In this extruder the mixture is kept under a suitable pressure, so that an expansion of the mixture under the action of the blowing agent in the extruder for so long is largely prevented until the mixture leaves the extrusion mold at the discharge end of the extruder »The extrusion mold has a discharge opening that is considerably smaller than the required durometer or the required size of the desired Band. The temperature of the polyethylene as it passes through the extrusion fora is around 193 ° C.

A preferably untwisted or only slightly twisted fine fiberglass web is obtained from a spool or cone or other suitable storage device for this Material through the extrusion head and die at an appropriate angle to the axis of the die opening, conveyed to the center of the mold opening and in this center by a suitable yarn guide or a suitable one Yarn carrier held.

The multifiber core 6 has a very small overall diameter in relation to the diameter of the body 5 of the band. As an indication of the small size of the core 6, the note serve that 1650 m of this yarn or web about Weighing 450 g, and that its individual glass fibers make one Have a diameter of only about 0.013.

Under the pressure at which the heated and plasticized polyethylene is held in the extruder directly in front of the extrusion die of the extruder and in the extrusion When the mold opens, the plasticized polyethylene adheres to the fine fibers of the yarn core 6. immediately after it has been

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come out of the mold opening, the polyethylene 5 expands under the action of the propellant contained in it to one Cell structure, and its diameter increases considerably, with the core 6 remaining in the center.

At a short distance beyond the discharge opening of the extrusion mold, on the downstream side of this mold, the expanded extruded polyethylene body 5 with the in his core 6 is cooled by being passed through water whose temperature is about 10 C.

The extruder pushes the heated and plasticized polyethylene through the extrusion die under suitable pressure. However, after the band k, the extrusion of the form has exited, it is drawn from the shape of a straight line through the cooling water to it from the recording apparatus or the winding device by which the final end bead 4 or the like on bobbins "or otherwise W _e ise wound up, wound up.

In its original form, before it is heated and expanded, the polyethylene has a density of about 0.915 g / cm, and in its expanded or inflated cellular state the body 5 of the hem band k has a density of between 0.25 and 0.35 g / cm. The expanded cell body 5 also has a relatively low tensile strength.

While the interior of the body 5 of the hem tape k has a cellular structure, the outer surface is generally smooth and impermeable

The expanded polyethylene cell body 5 of the hem tape is elastically compressible or resilient in the radial direction

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elastic under radial pressure and returns with one only little time delay after such pressure has been removed.

A in Fig ₀ 3 in general with 8 designated strand or piping or edging is produced in that a web "or cloth strip is folded 9 and is inserted the end bead 4 in this fold, the Randabsohnitte 10 and 11 of the fabric strip 9 by stitches 12 are sewn together very close to the hem band 4, as shown in Fig. 3, creating a sewn-in flap or flange 13 to which the edge zones of the adjacent cloth surfaces of the upholstery item or cover or protective cover can be sewn.

A double hem can be created with the hem tape described here Manufacture by making two strips of braid, piping or border of Fig. 3 between adjacent Tuchstiieke or the like. be sewn on. A double hem braid can be made by creating

two adjacent folds made in the braided fabric in which
the, with each of these two folds then a hem tape 4 is inserted, whereupon the protruding cloth parts are sewn together to form a sewn-in flap.

Due to the high tensile strength of the glass fiber yarn core 6 to which the expanded polyethylene body 5 adheres, the hem band 4 is dimensionally stable in its longitudinal direction, while at the same time it is very flexible and also in the transverse direction is elastically deformable.

Because of this dimensional stability, the hem band 4 can be sewn into the hose-shaped border 8, and the latter can be sewn again at the junction of adjacent upholstery sheets or cloths, so there are no creases whatsoever. Formation occurs, although the Bortentuohstrip is so cut can be.

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Due to the great flexibility of the velvet ribbon 4 can right-angled corners and other corners of small radii in the hem · « tapes or bumper strips of the upholstery parts or other products can be produced more quickly.

Due to the fact that the core 6 is essentially non-stretchable, the hem tape k can be made more easily because it can be peeled from the extrusion die without stretching or otherwise adversely affecting the resulting product.

As an alternative to the fine fiberglass web or fiberglass yarn, the core 6 can also be made from a similar web untwisted or slightly twisted, high-tear resistant rayon fibers or other generally inextensible fibers of high tensile strength "

Although, for the sake of simplicity of illustration, the fibers shown in the drawing which make up the core 6 are arranged separately and at a distance from one another, with only relatively few fibers of this type being visible, the number of fine parallel fibers of the core 6 is shown in FIG Reality, of course, is much larger, and they are not spaced apart, but are in close contact so that they form a compact bundle of fibers.

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Claims (1)

- Ii - PATENT CLAIMS Hem tape high flexibility, radial elasticity and high tensile strength in the longitudinal direction, characterized by a compact, essentially non-stretchable, highly flexible Core (6) with a small diameter and high tensile strength and an extruded, expanded cell structure Synthetic resin body (5) of low density and low tensile strength, which surrounds the core (6) and adheres to it, without sliding movement between the body and the core, the extruded cellular synthetic resin body generally dimensionally stable and elastically compressible in the radial direction with approximately complete recovery is. £. Hem tape high flexibility, radial elasticity and high tensile strength in the longitudinal direction, characterized by a compact, non-stretchable central core (6) high Flexibility and small diameter, which consists of a multitude of fine fibers of high tensile strength that are roughly parallel run to each other, and through an extruded, an expanded cell structure having synthetic resin body (5) low density and low tensile strength that surrounds the core (6) and adheres to it without any between the body and sliding movement takes place in the core, the extruded cellular synthetic resin body generally retaining its shape and is elastically compressible in the radial direction with approximately complete recovery. 3. seam band high flexibility, radial elasticity and high tensile strength in the longitudinal direction, characterized by a compact, non-stretchable central K _e rn (6) of high flexibility and small diameter, the high tensile strength of a plurality of fine glass fibers is that about 209837/0 6 36 run parallel to each other, and through an extruded, an expanded cell structure having synthetic resin body (5) of low density and low tensile strength, which the core (6) surrounds and adheres to it without sliding movement between the body and the core, the extruded cellular synthetic resin body generally dimensionally stable and in the radial direction with approximately complete recovery is elastically compressible. 4. Tape according to claim 3, characterized in that the synthetic resin deö body (5) is polyethylene. 5 x seam band high flexibility, radial elasticity and high tensile strength in the longitudinal direction according to claim 1, characterized in that the strip as a seam band for upholstery purposes, protective coatings, decorative purposes, lampshades, handbags and the like is usable _o · 6. Hem tape high flexibility, radial elasticity and high tensile strength in the longitudinal direction according to claim 2, characterized characterized in that the tape is used as a hem tape for upholstery purposes, protective covers, decorative purposes, lampshades, Handbags and the like can be used. 7. Hem tape of high flexibility, radial elasticity and high tensile strength in the longitudinal direction according to claim 3, characterized characterized in that the tape is used as a hem tape for upholstery purposes, protective covers, decorative purposes, lampshades, Handbags and the like «, can be used. 8. High flexibility, radial elasticity and hem tape high tensile strength in the longitudinal direction according to claim 3, characterized characterized in that the synthetic resin body (5) is made of polyethylene. 2098 37/0636 9. Hem band for braids, tucks, braids and the like after one of claims 5 to 8, characterized by a folded Cloth strip (9) which wraps the hem hand (4) tightly in the fold and two extending in the radial direction Has edge zones (ll, 12) which are in the vicinity of the hem band are sewn together (l2). 209837 / Ü636 Lee on the back