DE2029979A1 - - Google Patents

Description

PATENT ADVOCATE DiPL-INQ. KARL SCHMIDT

Telephone 28 70

Postsoheok account ι Frankfurt CMaInJ 1389

Bank details: Nasanuleche Sparkasse main branch Frankfurt CMaInJ account no. 14 000 55

Your sign

Regards

Your letter of

My Zelöhen

RvGm 7021

FRANKFURT AM MAIN

Roßmarkt 1Sat

^June

Industrial Sealants Limited 1, Redcliffe Street, Bristol / England.

Process and material for securing and maintaining the location and shape of rubber bands.

The invention relates to a method and material to secure the shape of rubber bands so that -sie ^{1 can be} stretched and relaxed without tearing their anchoring.

The usual rubber bands are in their shape in the Way that they kept with a thread-like material

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be wrapped and so form a wrapped web or tape, the latter being a variety of shows elastic threads, which are arranged side by side in the individual band. The shape is secured by that the tape is then linked or optionally given an envelope which is also linked. This production is cumbersome and time-consuming. This requires expensive machines in which malfunctions frequently occur and require experienced operating personnel. The invention is intended to remedy these disadvantages and make it possible for the elastic band to be used without chain wrapping and without wrapping is immediately secured in its Eorm.

The term "rubber band" is intended to mean a material that at room temperature at least around twice its original length can be stretched and after stretching it can be approached powerfully in a short time takes its original length. This is not just for rubber, but for the various ones as well Buna species of importance.

Furthermore, the invention relates to a method to secure rubber bands in their position on a flexible substrate, in particular the edge of the band when

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2029973

■. :: - 3 - '■■■■ ; : ■■■■■

stretched rubber band, so that after stretching the substrate by the elastic band in its original, puckered Length is returned. It is also intended to prevent the tape from moving during the period of use stretches.

Another object of the invention consists in a Process for binding an elastic band to a substrate of the aforementioned type without being particularly stretchable Glue must be used and without the tape having to be covered with an adhesive.

The invention also provides new means for the storage and output of pre-stretched elastic Ribbons in front.

The invention resides in an elastic band connected to an elastic substrate. Means a stretchable adhesive, the substrate being in a longitudinally pressed state, see above that the substrate and tape can be stretched at least until the substrate is no longer curled, without tearing the adhesive binding. The invention also relates to a method for applying a binder

009852/2116 ORIGINAL BATHROOM

_ ₄ , ■ 202997t

between an elastic band and a substrate, the elastic band being stretched and connected in the stretched state to the substrate which is not pressed in the longitudinal direction by means of an adhesive which relaxes and stretches with the elastic band.

In one application example, an elastic tape is used, on the surface of which a stretchable heat-sealing or pressure-sensitive adhesive is applied, with which the tape can be heat-sealed to a flexible substrate.

The elastic material of the tape and the stretchable Heat seals can be made of different materials, wherein the heat seal adhesive is applied as a layer on the elastic band. You can also choose to use the two consist of the same material. That is, the tape can be formed from an elastic material which is itself a heat seal adhesive. In addition there are connections on the basis of the so-called thermoplastic rubber, which is oil-filled and bonded with sticky resin could be. If the connection obtained is sticky, its surface can be treated with a sticking agent Powders, such as starch or sebum, can be dusted, spreading onto the surface of the belt during the Warm victories!

009852/2116

An important aspect of the invention resides in the Recognition that elastic heat seal adhesive compounds, especially those based on tacky thermoplastic Rubber unite with the tape, which is ■ heat sealed under tension without the bottom the material of the belt relaxed (the belt can have different cross-sections). Suitable Connections are disclosed in British Patent No. 1,033 specified. Although the elastic bands according to the invention in the unstretched state on the flexible substrate with the substrate itself being stretchable, the main application becomes in the stretched state seen on the flexible Bufoattrat. The sealing process takes place under prescribed conditions so that the tension which occurs in the body of the belt does not decreases when the ligament softens. When the tension is released, the flexible substrate automatically goes into the folded starting position back.

Basically, the substrate comb wrapped around the tape and the heat seal on either side be carried out simultaneously or in succession, so that the tape is enclosed in an envelope.

This procedure is for the compliance of the openings

009852/2116

in the envelope and has particular application for paper envelopes. The elastic band with the heat seal surface and the edge of the envelope to be held elastic becomes at different speed fed to a seam forming device which folds the turnup edge over the stretched tape, wherein in connection with a heating device by means of a contact acting on the opposite sides, the edge is formed.

If an elastic material that is not itself a heat seal adhesive is used for the tape, the heat seal adhesive consist of a layer containing a sticky thermoplastic rubber in the manner described above contains. The elastic band can then in a direct or in a relaxed state, in the manner already described above be applied. In this case the heat seal is less critical because of the elastic band body is less sensitive to heat softening.

A suitable composition for an elastic band includes:

(1) Cariflex KlOl (thermoplastic rubber) 267 gr.

Staybelite Ester 10 (tackifying resin) 400 gr «,

Oppanol B3 ι 46 gr

Antioxidant 2246 1 gr.

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If a separate tub sealant is used, then so .can be put together in the manner described above and applied as a layer to the tape * white * Other thermoplastic rubbers are under the name Shell TR 1101 (known as Cariflex KlOl) and Solprene 1205 applicable «Optionally, other stretchable heat-sealing materials can also be used like ethylene vinyl acetate copolymer, · the To be sold under the trade name ELVAX, for application come. Suitable copolymers can be 30-70% vinyl acetate and can be made sticky by means of a tackifying resin «

In the composition given above, Antioxidant 2246 is: 2,2 - methylene bis (4 - methyl - 6 - tert.butyl phenol) Of the other oxidants that are used, be lonox 330, Topanol CA and Neganox DLTP mentioned. Topanol CA is trisphenolic High molecular weight antioxidant, Neganox DLTP is di-lauryl dithio dipropionate, while Ionox 330 is also a high molecular weight phenolic antioxidant. These can be in the following compositions be used.

A typical elastic tape composition for a heat seal tape is:

009852/2116

TR 3226 100 TR 1101 10 antioxidant 1

Optional band compositions are:

Parts by weight

(3) TR 4113 75 (4) TR 4113 46 TR 1101 25 TR 3226 23

Antioxidant 1 TR 1101 ■ 30

(5) TR 4113
, TR 3226

antioxidant

75 25

(6)

TR 4113 100

Carinex GP Polystyrene 21st

Shell Edelex 45 19 Antioxidant 1

Shell Edelex 45 is a naphthenic oil TR 1101 is a block copolymer of styrene and butadiene TR 1107 is a styrene block copolymer and isoprene TR 4113 is an oil extended block copolymer

styrene and butadiene

TR 3226, TR 4113 is the oil and polystyrene as well

Contains fillers, for example, whitening agents.

009852/21

Typical coatings for elastic threads are:

TR 1107 100 (8) TR 1107 100 Shell Bdelex 45 15th Shell Bdelex 45 15th Piccolastic A50 ol5 Staybelit Ester 10 5 Piccolastic A5 VJl antioxidant 1 TR 1107 100 (10) TR 1107 100 Shell Bdelex 45 15th Shell Edelex 45 25th Staybelit Ester 10 15th Piccolastic A5 VJl Piccolastic A50 10 antioxidant 1 antioxidant 1

"Piccolastics" are trade names for polystyrene compounds, Staybelit Ester 10 is hydrogenated ester resin,

A typical composition for natural rubber latex thread

is:

(11) rubber (latex form) caustic potash (10% solution) potassium oleate (20% solution) Zinc oxide (finely divided) Sulfur (finely divided) Non-coloring antioxidant

Weight parts, dry 100 0.35 2

2:

1 .1

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Parts by weight dry Z.M.B.T. '■■■ "■■■ - ■■■■ 1.5

Butyl Ziraate ο. 25th

Z.M.B.T. is zinc. Mercapto-benzthiozole.

The mixing of the elastic components is expediently carried out in a Z-blade mixer with a screw discharge conveyor. The Mischaustragszyklus is 1 1/2 hours at 140 ⁰ G. The blended material is extruded as a strand (about 12 mm 0) ft into a 20. Water bath and taken to drying by means of scrapers and air rings in a • granulator. The elastic thread is produced in such a way that the grains are fed to an extruder (screw diameter 36 mm; screw length 20; 1 in relation to diameter 1).

The barrel of the extruder is set to about 1505ο. * warms up and the nozzle (round hole with approx. 3 mm 0). to 180 ⁰ C. The thread is placed in a water bath for cooling? drives, dried when passing through the air rings, powdered when passing through a dusting device and then wound up.

For the coating of the elastic thread this will be

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Coating material mixed as indicated above. The pressing technique is similar to the above with the difference that the extruder has a coating crosshead, the works in a known way. The coated thread is cooled in a water bath, dusted and wound up.

For wet coating, the elastic material is vertical down through a special coating head guided so that the thread is aligned centrally to the nozzle outlet opening. The size of the opening exceeds that supplied coating weight. The coated thread is led down and placed in a heated drying zone, through which a stream of air flows, dried. The thread is then dusted and wound up. The glue solution is usually found in toluene at about 50% Solids content mixed in a Z-blade or turbo mixer at normal room temperature.

A similar device is used for hot-melt coating, with the difference that the coating head is heated and, if necessary, pressurized. The drying zone is replaced by a cooling zone.

009852/2116

For surface coating, a rubber strip is passed through a conventional adhesive coating machine and then slotted. The disadvantage of this method is that elastic threads made from it with a rectangular cross-section are not coated on all four sides.

Instead of a heat seal adhesive, a eucohesive material can be used to hold the elastic band to the substrate. This can be thermoplastic based Rubber grades be built up, but be stickier, so that it has pressure-sensitive adhesive properties. Alternatively, conventional rubber-resin adhesives can also be used.

A suitable pressure sensitive adhesive is:

Rubber 75 Piccopal 100

Piccolyt S115 ester rubber Santovar A

100

446 A hydrocarbon resin
(Trademark of Picco Corporation) 28.6 A polyterpene resin
5.35

1-0 2.5 di-tertiary butyl-hydroch-

innn.

009852/2116

Its application is the same as that for non-printing \ sensitive coating solutions.

The invention includes a number of new forms of elasticity Tapes that are suitable for the same technique as described above.

In one form, the elastic band picks up on its surface a stretchable heat seal adhesive. How nice indicated, the elastic material of the tape and the stretchable heat-sealing adhesive can be made of different materials exist, wherein the heat seal adhesive is applied as a coating on the elastic band. Optional the two can also be made of the same material. Suitable materials have already been described.

In a variation of the heat seal material can be made ER "härtetem \ elastomer made that auf.die surface of the belt as a leather layer on |;. Is eti" agen example, poly-

■ '- ■ "- - ν
vinyl butyral can be sprayed onto an elastic thread that has previously been made sticky by passing a flame through it quickly.

Another training for a pressure sensitive adhesive tape is given by the fact that a pre-stretched elastic

009852/2116

Adhesive tape is carried by a fabric backing that is incompressible enough to hold the tape in a stretched condition. The tape can be removed from the fabric backing are peeled off, wherein the tape and / or the carrier layer have an adhesive layer on the side that facing away from the fabric backing.

The new adhesive tape according to the invention allows a To widen pre-stretched elastic tape and apply it to a substrate, simply using the adhesive surface xsl £ of the tape is pressed onto the substrate and the fabric backing is peeled off.

In one embodiment, the carrier web is over the fabric backing laid, wherein the carrier web is relatively compressible in the longitudinal direction and, for example, a pressure-sensitive Carrier layer or one impregnated with an adhesive * te fabric panel. One or more pre-stretched elastic bands in the form of threads or strips are then laid along the carrier web leaving sufficient space so that the entire, namely carrier web and / or tapes can be applied to the substrate.

In a further embodiment, the carrier web is designed as a double-coated carrier fabric. This can also

009852/2116

of film-like material or of woven or non-woven (non-woven) fiber material.

Furthermore, the elastic band itself on its Fabric underlays opposite surface with a pressure-sensitive Be coated with glue. In this case, if desired, the elastic band can essentially cover the fabric backing and an adhesive on both surfaces wear.

If a particular stability is required, a fabric underlay can be used and elastic band take up an intermediate layer, which is pulled off before the elastic band is glued on will. In general, however, this is not necessary, especially if the elastic band does not itself carry an adhesive layer, so that in the case of a roll the tape or tapes serve to carry the adhesive Position to be kept at a distance from the fabric backing, which of course receives a removable layer.

A particular advantage of this technique makes it possible that in most embodiments the gluing of the elastic The tape on the presented tape causes a hem in the form of a sleeve to be folded around the substrate.

00 9852 / 21U

The nature and dimensions of the fabric backing will be dependent on the tensions in the elastic band or bands corresponding to the cross section of the elastic Material, its modulus of elasticity and its degree of stretch.

In the manufacture of elastic garments it has been found that commercially available siliconized paper on is most suitable.

For the elasticization of garments it is preferred that the 100% module of the homogenized belts 10-25 kg.

ρ p

per cm and should not be greater than 10 kg / cm if the Heat seal plastic rubber is used as a coating on conventional elastic threads or tapes. The tensile strength is preferably 50-350 kg / cm.

In the case where the elastic band around the envelope one Opening is held in a flexible substrate as in the opening of a garment, is expedient Tape wrapped around the edge portion of the substrate to form an envelope. The substrate is then with the connected opposite sides of the tape. In the case of a heat seal adhesive, this is achieved by means of thermal Touch on both sides of the case, whereas with pressure-sensitive adhesive coating on both sides

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an adhesive layer is applied to the tape.

The invention has particular application to elastin fication of single-use and non-woven fabrics, especially underwear.

The invention is explained in more detail below with reference to the exemplary embodiment shown in the drawing.
Bs shows:

1 shows a machine for pre-stretching and heat sealing an elastic band on a piece of webbing,

elastic
Fig. 2 a / envelope in section,

3 shows a pre-stretched elastic band in section

(on an enlarged scale),
4 shows an elastic envelope which is produced by means of such a band in section,

As can be seen from FIG. 1, the elastic band 1, which can be a thread made of plastic rubber or coated hardened rubber, is guided from the reel 2 between the rollers 3 and through the guide tube 4 to the heated drive rollers 5. The clamping between the rollers 5 is in the area of a. Gap 6 of the work table 7 along which the to be reinforced

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Products (not shown) are guided so that the band 1 is encompassed as it passes through the rollers 5 by the folded-over edge parts of the products. The rollers 5 are driven by a motor 8. A spring, not shown, presses the rollers 5 together, the lower one being connected to a pedal 9 so that it can be pulled down to open the clamp, if necessary. . In general, the rollers 5 at 120 - 220 ⁰ C and heated ft at a peripheral speed of about 60 / min. driven. The pinch rollers 3 are able to reduce the peripheral speed via a gear unit in order to achieve the desired degree of stretching.

According to FIG. 2, the part 10 has a non-woven one Fiber material (non-woven fabric) an edge strip 11, which is turned over to form a cover. This one will held by means of a band or strip 12, which on both sides facing the fiber material 10, with an adhesive binder 13 is provided. As already explained, this bond 13 can be produced by superficial softening of the rubber tape 1 or by softening an applied adhesive layer. A similar one, however less preferred © training is achieved by using a pressure-sensitive adhesive layer.

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In Fig. 5 a new pressure-sensitive adhesive tape is shown, which has a relatively incompressible tape base 14, for example a siliconized paper tape and a press-on adhesive layer 15> on the other hand or several bands (strips or threads) 16 carries pre-stretched silastics. This structure could, if desired, on a continuous base using the machine shown in FIG. Here would the supply of heat is omitted and the adhesive-coated tape 14, 15 is supplied instead of the fiber material 10. The elastic strips 16 can be made of conventional material exist like hardened elastic rubber «A sufficient area 17 with adhesive is left, so that the adhesive 15 and the elastic strips 16 can be pressed onto a substrate. In Fig. 4 a cover is shown made of a non-woven fiber material 10 and the band of Fig. 3 are formed, wherein the areas 1) of the adhesive bind the overlying surfaces of the fiber material 10 directly together. The adhesive 15 can be designed as a simple adhesive film layer. However, a porous carrier fabric can also be used can be used, which is impregnated with an adhesive. It is also possible to double-coat the carrier fabric with an adhesive.

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Also, if desired, the elastic strips 16 themselves can be coated with an adhesive, in particular then, if the gap 17 is narrow or if the elastic strips are thin, they can be completely different from that Glue to be covered.

In extreme cases, the tape can be produced in such a way that that each side of the stretched elastic bands 16 is coated with pressure sensitive adhesive and that immediately before one side is applied to the base 14. In this case, you don't need to use glue to be overlaid.

Claims -

009852/2 116 BATH

Claims (9)

Claims. 1. Elastic band with a flexible longitudinally pressed substrate, preferably non-woven Fibrous material (non-woven fabric) is connected in such a way that the substrate is pressed when the tape is relaxed is characterized by that the elastic band by means of a stretching and relaxation of the adhesive that participates in the tape and the adhesive preferably holds a cover strip which overcomes to form an envelope part of the substrate is folded. 2. Tape according to claim 1, characterized in that g e k e η η - . draws that it is made of a thermoplastic There is rubber and is directly connected to the substrate by the material of the belt surface. 3. Tape according to claim 1, d a d u r c h characterized in that it is by means of an adhesive strip that is wider than the tape with the flexible Substrate is connected, the shell being held by the overlapping adhesive tape. 009852/2116 4. Method of connecting a stretched elastic band with a flexible one in the longitudinal direction substrate pressed in such a way (preferably made of non-woven fiber material) that it is crimped, characterized in that the tape during the stretching with a tension and relaxation of the elastic band participant adhesive is connected » 5. The method according to claim 4, characterized that the elastic band consists of a thermoplastic rubber compound and is bonded to the substrate by superficial heating thereof against the substrate. 6. The method according to claim 5, characterized in that the _r stretched thermoplastic rubber band is passed between two layers of a flexible substrate to a heating station in which the substrate layers are pressed to the surface softened by the heat tape. 009852/2116 7. The method according to claim 4, d a d u r e h g e indicates that the stretched tape is first applied by means of a pressure sensitive adhesive a relatively incompressible carrier tape is applied, in which case the adhesive and the elastic tape pressed by the carrier tape onto the flexible substrate and the adhesive, which preferably overlaps and also covers the tape, by formation a folded seam on the substrate encloses the elastic band as a cover. 8 * tape for carrying out the method according to claim 4, d a d u r c h marked, that it is provided with a heat-seal adhesive connection on the * surface and preferably by the Heat-seal adhesive connection is formed. 9. Pressure-sensitive adhesive tape for carrying out the " driving according to claim 7, characterized marked eic h net that it consists of a pre-stretched elastic There is tape, which by means of an adhesive backing layer on a base, for example a siliconized Paper is picked up that is incompressible enough to keep the tape stretched 009852/2116 to hold, whereby the tape with the adhesive backing layer is printed from the underlay onto the substrate can and the carrier layer is preferably "wider" than the tape, the latter with an adhesive can be coated. 009852/2116 is Blank page