DE1766731U - TAPES OR STRIPS OF FOAM. - Google Patents

Description

Ribbons or strips of foam and processes for their manufacture - The invention relates to the manufacture of ribbons or strips from foam and aims to provide such ribbons or strips with reduced extensibility.

Ribbons and strips made from natural and synthetic foam are increasingly used in connection with textile products to woven fabrics and braids and knitted or processed as a circulation in braids and in knotting technology related ; It is also already known to convert foam tapes or strips into tubulars To store textile products. The foam bands or strips act here as a cushioning material, for example in the case of carrier tapes or the like. Furthermore, foam tapes or strips, for example, to decorative fabrics, blankets, cushion plates, insoles o. The like. Be processed.

During processing and depending on the area of application, the greater or lesser extensibility of the foam tapes or strips is undesirable. So far, this extensibility has been limited by the fact that the bands or strips laminated, woven, knitted or braided with a non-stretchable material. In certain cases, however, these methods cause technical difficulties; they are also comparatively expensive.

In contrast, the invention provides for a foam tape to bring along this extending framework or in the band such To form a framework, either on its own or in cooperation with the things in between lying foam due to its structure and / or its material properties limits or reduces the elasticity of the tape. It should be noted that the elasticity of the said structure depends on the elastomechanical properties depends on the framework material, but also on its geometric dimensions and its structure can be determined.

The framework can be produced, for example, in that the Foam tape is coated or soaked with a suitable mass that is solidified with or without the action of heat and thereby either rigid or plastic and / or becomes elastic. This is essentially close to the surface The framework produced by the foam tape can according to a further concept of the invention to be removed later when it is no longer is needed. For example, the foam tape reinforced by a frame can be braided, Knotting'o. Like. Processed to a textile and then by appropriate treatment of the finished textile can be removed from the foam strips. To do this, z. 3. Either a framework material is used that has a lower melting point or softening temperature range as the foam material; the final treatment the finished textile then consists of heating to such a temperature in which the framework material melted out of the pores of the foam strips will.

But you can also use a framework material that is in a dissolves certain solvents, if necessary with the application of additional heat, while the base material of the foam remains undissolved and unchanged.

This type of framework formation according to the invention offers according to another Inventive concept still further practical 'possibilities. You can namely the coated, compress soaked or dipped foam tape by applying mechanical pressure and allow the framework material to solidify in this compressed state of the tape. If the reinforced and compressed band is wrapped in a textile, for example provided and then removed the framework in the manner described above, so the foam tape expands to its original volume and fills the wrapping is plump.

In a further development of the inventive concept, you can use the scaffolding also through this. produce by inserting a thread into the foam tape from the outside, a strand, a tape or the like made of a material of lower extensibility than that brings in untreated foam tape. This introduction can preferably thereby take place that you the foam tape at certain intervals and in a certain Arrangement continuously provided with holes through which the thread, o. The like. After a specific scheme is drawn and linked if necessary. Here perforation and threading by hand or by machine, preferably e.g. B. with the help of a sewing machine, take place.

In the simplest case, the foam tape with one or more Longitudinal seams provided. A framework created in this way gives the foam tape a only very low extensibility, which is essentially due to the elasticity of the thread material and the type of seam laid is determined; but you can also add to, for example also reduce the transverse stretchability of the foam tape, seams also transversely and / or at an angle to the longitudinal direction of the tape.

If not too great a reduction in the elasticity of the foam tape is desirable, the invention further provides the seams in special geometric To place orders leading in the tape. The framework then consists of one or several, possibly interconnected seams, with one Strain Not only can the pieces of thread forming the framework stretch elastically, but the entire framework is also spatially distorted. This distortion causes a change in shape of the foam elements surrounding the frame, but they are no longer like this This is the case with non-reinforced foam tape - only on tension, but also on Pressure, bending and shear are stressed.

The inevitable consequence of this partial conversion of the original tensile stresses into compressive, bending and shear stresses is a more or less great reduction in the extensibility of the reinforced foam tape. This described chip . around transformation is already taking place, but only in proportion moderately small, with the pure longitudinal seams described above. The loops formed by the thread or threads when sewing are namely drawn together when the seam is pulled longitudinally and the foam elements located in the loops are thereby more or less compressed.

The framework, which can be distorted in the above sense, can be designed in a variety of ways. You can z. B. use one or more normal seams, which are not guided in a straight line in the longitudinal direction of the foam tape, but in a wave, zigzag or meander shape. By choosing the wavelength and width or by choosing two or more wave-shaped or similar seams, which can also be offset from one another or cross one another, the extensibility of the reinforced foam tape can be adjusted in t wide limits can be controlled as desired. But you can also make the seams elastic by doing this design so that the individual stitches are zigzagged or similarly offset to the side of the sewing direction. Such seams and the sewing machines used for their production are known to the textile expert. It should only be mentioned that the stitch width also influences the stretchability of the framework, as does the type and strength of the thread.

It is also not necessary for the seam or seams to be continuous and lay it together over the entire length of the foam tape. It can rather, more or less long individual seams in the longitudinal direction and / or transversely and / or placed obliquely to the longitudinal direction and / or in a corrugated or similar shape that have no other connection than the surrounding one Foam. This also reduces the elasticity of the armored Foam tape achieved without departing from the essence of the inventive concept. It should be mentioned, however, that with this type of scaffolding - apart from special cases - the Tensile strength of the armored foam tape against biting no longer by the Scaffold is determined, but only by the strength values of the foam itself. However, the tensile strength of the armored tape depends on the type and structure of the framework in a complicated way from the individual limit values of the Foam depend on the compressive, shear, flexural and tensile strength.

The thread structure can consist of the same basic material as the foam itself. This can either be for purely economic reasons be desired, or z. B. then when the reinforced foam tape conscience later outer, z. B. is exposed to chemical influences, against which only this material is resistant.

The invention also provides that the thread forming the framework o. The like. Is used at the same time to the foam tape with another Textile part or the like to be firmly connected. For example, one can be attached to the foam tape abutting or overlapping textile tape firmly with the help of the thread structure connected to the foam tape.

The above-described, according to the invention by seams o. Like. Manufactured framework can be removed according to the invention widel later, if it has fulfilled its task and is no longer needed or no longer desired is. In this case, a thread material is used that has a lower Melting point or Boost temperature range than the foam material ; the final treatment to remove the framework then consists of heating of the reinforced tape to a temperature at which the thread material from the Foam tape is melted out; or a thread material is used, which is in a certain solvent, possibly with the application of additional heat, solves while the base material of the foam undissolved and remains unchanged.

Finally, the framework can also be formed from the foam tape itself, in that it is given weld-like densities in the longitudinal direction and / or transversely and / or obliquely to the longitudinal direction by means of heat treatment. By such a so-called hot stamping, which is carried out in a manner known per se, for. B. is achieved by heated profile rolls, rolling, cutting o. Emboss the tape, which reduces its elasticity accordingly will.

The use of elasticity is particularly advantageous lowered ribbons when it comes to weaving foam ribbons, to wrap or braid, as foam tapes can be stretched without stretching them degrading scaffolding on the corresponding textile machines as a result of their too large Only allow stretchability to be changed with great difficulty.

However, the casing does not cause any significant difficulties, when the elasticity of the foam tape serving as a core, for example of carrier tapes is reduced according to the invention. After the casing has been made, this can be done by the Scaffolding that reduces stretching removes the original elasticity of the Foam tape can therefore be restored.

In those cases where the scaffolding is made up of, for example, seams or similar seams Hot stamping is produced and where it does not matter that the original ductility of the plastic tape is restored, the seams or the like can be used to generate Special effects (patterns or the like) are used.

In the drawing are shown in Fig. 1 to 11 embodiments of foam tapes, which have been limited in their extensibility according to the invention shown.

Fig. 1 illustrates in plan view a piece of foam tape 1 with a seam laid along its center line 2. This seam goes through the the entire thickness of the foam tape goes through it and is tied with an ordinary textile thread manufactured ; but it can also be done with a plastic thread, preferably with a those that are subsequently released from the foam tape 1 are generated leaves. The stretchability of the seam 2 is less than the stretchability of the seamless Foam tape 1. The tape provided with the seam 2 thus has a smaller one Extensibility than the seamless tape. So should, for example, a seamless foam tape 1 are woven or knitted, the greater elasticity of the tape having a disruptive effect, so the seam 2 is placed in the tape, whereby the stretchability of the foam tape is reduced, and then the weaving or knitting of the tape made. If the band is woven or knitted, the seam 2 can be removed again, for example by dissolving them by the action of heat or by chemical action.

Depending on whether the foam tape is more or less stretchable if desired, several seams can be placed in this instead of a single seam are, as illustrated in Fig. 2, where in the foam tape 1 two Seams 3 are close to the tape edges. Of course, these seams can also be arranged closer to one another or it can in addition to the both edge seams a central seam, as shown in Fig. 1, in the Tape to be laid.

In Figs. 1 and 2 the seams are straight along the length of the foam tape out and 'for example designed as quilted seams. But you can also use the seam Lay zigzag along the tape, as shown in Fig. 3 by the seams 4 of the Volume 1 is illustrated. Ever. according to the type of zigzag shape of the At the seam, the band 1 has a more or less reduced extensibility in the longitudinal direction.

Fig. 4 is supposed to be in a band 1 in a straight line along this illustrate running zigzag seam 5. Such a zigzag seam has a greater elasticity than a straight stitched seam, as shown at 2 in Fig. 1 is shown. So you can. also through the type of seam the elasticity of the Adjust foam tape at random.

Figure 5 illustrates two at a short distance from the belt edges laid zigzag seams 6 in the foam tape 1.

A band reinforced in this way shows when the zigzag seams 6 are equal to the zigzag seam 5 in Fig. 4 are formed, a lower extensibility on, than the band 1 of FIG. 4 provided only with a central zigzag seam 5 the two seams 6 in Fig. 5 are designed differently, so one can achieve that half of the foam tape is larger, the other half is smaller Possesses extensibility.

Fig. 6 illustrates a foam tape 1, the edges of which each an overcast seam 7 are provided. Again, the elasticity of the tape is 1 limited to the extensibility of the overlock seams 7, while at the same time the advantage is that the seams 7 encompassing the edges of the band 1 pose a risk the tearing of the foam tape at its long edges.

Fig. 7 illustrates a foam tape 1, d-as with two in the In the longitudinal direction interrupted seams 8 is provided, the seams, however, so guided are that the one seam extends over the portion of the tape in each case, in the other seam has a gap. This allows for different Tape sections achieve different elongations, which is the case with certain processing operations of the foam tape may be advantageous - Figs. 8 and 9 illustrate in plan view and in a section across the foam tape 1 brought a few in this Weld. The middle part of the band is compressed at 9 so that there the foam structure of the tape 1 is canceled. The compressed zone 9 of the The tape has a lower extensibility than those on both sides of this zone Band parts. This means the elasticity of the entire band is through determines the extensibility of zone 9. This zone can be generated, for example be that the tape is soaked in it with a binder and the pores of the Tape can be glued together using pressure. After processing the In this way the elasticity of the tape can be reduced, the binder can be removed from the tape be released again.

Figure 10 illustrates welds zigzagged across the ribbon 10, which have been produced in accordance with the weld 9 in FIGS. 8 and 9.

In the illustrated in Fig. 11 foam strip 1 is the upper and lower strip layers 11 and 12 have been impregnated with a mass that has a lower coefficient of expansion than the foam. This mass is on the upper or.

The underside of the foam strip has been brushed on and inserted into the Layers 11 and 12 penetrated. The stretchability of the foam strip is thus determined by the lower extensibility of the outer layers 11, 12. For watering of these layers, a mass is preferably chosen that is different under the action of heat or can be removed from the foam again by chemical action, so that the reduced extensibility of the foam strip can be subsequently canceled can. Instead of just the outer layers 11,12 of the foam strip with a mass The foam strips can of course be used to impregnate less elasticity also be impregnated with this mass over its entire cross-section.

Claims (1)

Sohutas claims ........... ---- ...- 1. Ribbons or strips of foam, indicated by a extending essentially in the longitudinal direction «and framework incorporated into its cross-section with less elasticity wedge. 2. tapes or strips of foam according to claim l, characterized marked that the scaffolding aue one the? oren of the foam The material is completely or partially filled, rigidly rigid consists of elastic and / or plastic mass, 3. Ribbons or strips of foam according to claim l, d & dHreh characterized in that the framework must consist of one or more consists of 2ädtn # strands, bands or the like, which n & eh one pull the foam tape through certain sewing patterns. 4 * ribbons or strips of foam according to claim 1 and 3, characterized in that the seams siokackformig or ta otherwise run periodically laterally offset along the tape. 5. Ribbons or strips of foam according to claim 3, characterized characterized in that the seams are made from the compacted base material of the foam are existing welds.