|Publication number||US3214289 A|
|Publication date||Oct 26, 1965|
|Filing date||Nov 28, 1961|
|Priority date||Nov 28, 1960|
|Also published as||DE1240608B|
|Publication number||US 3214289 A, US 3214289A, US-A-3214289, US3214289 A, US3214289A|
|Original Assignee||D Ducarin Ets|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (10), Referenced by (16), Classifications (32)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Oct. 26, 1965 J. LEFEBVRE 3,214,289
FLEXIBLE FOIL-LIKE WEBS AND METHOD OF MAKING THE SAME Filed Nov. 28. 1961 Inventor 7:04 (I! [in I In:
Attorney United States Patent 1 Claim. 61. 117-422 This invention relates to new flexible foil-like webs and to methods of making the same.
Sheets and tapes consisting of synthetic material are known which are reinforced with longitudinally extending filaments or threads. Suchsheets or tapes are intended for packing and binding purposes. The sheets and tapes can in certain cases be provided on one side with an adhesive composition.
This invention relates to a flexible foil-like web which is reinforced with filaments or threads and which is especially suitable for packing purposes, and to the production of tapes for binding purposes or the manufacture of adhesive tapes, especially self-adhesive tapes, the said webs or tapes being characterized by high strength values, for example with respect to tensile forces, bending, impact and the like and as regards cheapness.
The flexible foil-like web reinforced with filaments in accordance with the invention comprises a large-mesh lattice material consisting of vegetable, animal, mineral, artificial or synthetic filaments, in which the openings in the lattice are each closed by a thin skin of an elastomeric substance.
The lattice material can for example consist of an openweave fabric or of a material consisting of superimposed, unwoven warp and weft threads or filaments. The spacing between the filaments (weft and warp) in the lattice material is preferably at least 1 mm. and is advantageously 2-4 mm.; however, for special purposes, the filament spacings can be substantially larger, for example 9 mm. or more.
The elastomeric material can consist of natural rubber or artificial rubber or another elastomeric synthetic material or mixtures thereof. According to one preferred embodiment, the elastomeric material is applied from a latex or dispersion on to the lattice material.
The warp threads, consisting of vegetable, animal, mineral, artificial or synthetic filaments, may be arranged at a regular spacing from one another and united by weft filaments consisting of any suitable textile threads, arranged at such a spacing from one another than an open arrangement or structure is obtained. Such a lattice material may be impregnated with a bath containing dispersions consisting for example of natural rubber latex or a latex of an artificial rubber, the latex, if desired, being modified with thermosetting resins. Thermoplastic materials may likewise be used, preferably together with plasticisers and in paste or dispersed form (plastisols or organosols). Fibers in flake or powder form may also be added to any of these types of impregnants. The impregnation is carried out so that after drying and polymerisation, a web is obtained in which the pores or interstices of the lattice material are closed by a thin film.
In a Web according to the invention, the weft filaments serve to maintain the spacing of the warp filaments, and should have a tensile strength suitable for the intended purpose, for example for packing purposes, as adhesive tapes or adhesive sheets.
The webs can be subjected to treatments to make them water-proof, flame-proof, rot-proof or the like and may if desired be colored. The products can also be used for the manufacture of garments and protective covers.
The Webs are especially suitable for applying on one side an adhesive in order to make adhesive tapes which have a strong and uniform longitudinal strength.
The web is preferably manufactured by drawing the lattice material, immediately after having been manufactured (for example by weaving or superimposition of warp and weft threads), through a bath containing a dispersion consisting of a natural latex or artificial rubber latex, or containing a plastisol, i.e. a dispersion of a plastic in a plasticiser. The bath may if required contain age resistors, modifying agents, for example thermosetting resins, as well as vulcanising or curing agents or accelerators. The bath may in addition contain pigments and/ or dyestuffs, as well as agents for flame-proofing purposes and/ or for preservative purposes and for protection against micro-organisms, and/ or for water-proofing purposes. If desired, fibers in the form of fiber dust or fiber flakes can also be present in the impregnation bath.
The underside of the flexible foil-like reinforced with filaments or threads may be provided with an adhesive, more especially a pressure-sensitive adhesive composition or a self-adhesive composition. If required, the top side of the web may carry an adhesive-repelling layer.
The invention is illustrated in the accompanying drawings, in which:
FIG. 1 shows diagrammatically a large-mesh woven fabric, in which the openings in the fabric are each closed by a thin film of an elastomeric material;
FIG. 2 is a diagrammatic view of an open lattice material, which is manufactured from superimposed warp and weft threads and in which the openings in the lattice are each closed by a thin film of an elastomeric material;
FIG. 3 shows a lattice material as a cross-section taken on the line Ill-HI of FIG. 2, in which the openings in the lattice are each closed by a thin film of an elastomeric material and which carries on its underside a self-adhesive composition and on its upper side an adhesive-repelling layer; and
FIG. 4 is a detail view and shows diagrammatically on an enlarged scale a section through a lattice opening, in which is disposed the film consisting of elastomeric material.
Referring to the drawings more in detail;
FIG. 1 shows an open wide-mesh woven fabric, the warp threads 1 and weft threads 2, the threads in each being at equal spacings from one another. The openings or meshes thus formed in the woven fabric are closed by thin films 3 of elastomeric material. The films can consist of natural rubber, artificial rubber or other elastomeric plastics or mixtures thereof. The distance of the Warp and weft threads from one another is kept constant by the thin films formed in the openings.
The embodiment shown in FIG. 2 comprises (when viewed perpendicularly to the plane of the drawing) a lattice material consisting of superimposed front warp threads 4, weft threads 5 disposed between them and rear warp threads 6. As will be seen the rear warp threads 6 are arranged staggered in relation to the front warp threads 4. They can also be disposed in alignment with the front warp threads 4.
The meshes or openings of the lattice material thus formed are again closed by thin films of elastomeric material.
In FIG. 3 the lattice material of FIG. 2 is further provided with an upper adhesive-repelling layer 7 and a lower layer of a pressure-sensitive adhesive composition 8. The upper adhesive-repelling layer and the adhesive composition adhere firmly to the support consisting of the lattice material, the openings of which are closed by thin films of elastomeric material.
The detail view of FIG. 4 shows the formation of the filnTs in the openings within the lattice material. In this figure it will be noted that the film 3 which closes the mesh is meniscus shaped being thinner in the center and thicker at the portions where it contacts the filaments.
The following example illustrates the invention:
Example I A web according to FIG. 1 can for example be manufactured as follows:
A lattice-like woven fabric was manufactured from 400 denier twistless yarns each of 1000 filaments of highstrength viscose rayon, the thread spacing in both warp and weft being about 3 mm. Immediately after manufacture the fabric was impregnated with a 30% by weight dispersion of butadiene acrylonitrile copolymer or of butyl rubber, the dispersion containing a small quantity of thiuramdisulphide. The fabric was drawn through the dispersion just after the sley of the loom by co-operating applicator and squeezing cylinders, one of which has an elastic surface.
T he treated lattice-like fabric was thereupon dried in air and vulcanised by being brought into contact with a heated cylinder. In the final product, the separate openings in the lattice were closed by thin films of vulcanised synthetic rubber, which in addition to closing the interstices at the same time effectively prevented a relative displacement of the threads of the fabric. The product had a very high tensile strength, a good bending and breaking strength, excellent resistance to tearing and high impact resistance.
Example II A web according to FIG. 2 may for example be manufactured as follows:
A lattice material consisting of glass filaments No. 50 (180 denier), in which the warp and weft are laid one upon the other and are not woven and which has a filament spacing (warp and weft) of about 4 mm., immediately after leaving the machine used for the manufacture thereof (French Patent 1,208,968) is coated with a polyvinyl chloride plastisol (polyvinyl chloride in dioctylphthalate) with a content of 1% of hexamethylene-diisocyanate on a coating machine and thereafter subjected to doctoring. After drying in air and after a heat treatment, the openings in the lattice material are satisfactorily closed by thin films. The underside of the web thus obtained is then coated with a self-adhesive composition of known type consisting of rubber, resin, filler and age resistor, while the top surface is provided with a coating consisting of an adhesive-repelling composition based on silicone or based on polyvinyl stearate.
Adhesive tapes manufactured from the web exhibit excellent properties,
The flexible foil-like web reinforced with filaments or threads in accordance with the invention is distinguished by high tensile strength longitudinally and also (where high strength weft is used) transversely and high bending and impact strengths. The warp and weft threads are anchored to one another by the films of elastomeric material and cannot be displaced relatively to one another.
Tapes manufactured from the flexible foil-like web reinforced with filaments are suitable as a binding material for many industrial purposes, more especially for packing purposes.
The flexible foil-like web reinforced with filaments can also be used for packing and protecting purposes and is distinguished by a particularly good resistance to chemical action and weather influences.
Sheets or tapes consisting of the filament-reinforced flexible foil-like web in accordance with the invention, provided with an adhesive layer, have high strength values and can be used instead of banding irons for the closing of containers, boxes, cartons and also for banding heavy and bulky articles, for example bundles of rods.
What is claimed is:
An adhesive tape for high-strength packing comprising a filament-reinforced flexible foil-like web, of a largemesh lattice material consisting of synthetic filaments having a spacing of from 2 to 4 mm., in which the openings of the lattice are each closed by a thin film of an elastomeric plastic material, said film in each opening being thin in the center and increasing in thickness in a meniscus to the point of contact with the filaments and a coating of a pressure-sensitive adhesive on one side of the lattice material.
References Cited by the Examiner UNITED STATES PATENTS 1,580,287 4/26 Colle et a1. 117-98 1,953,901 4/34 Ziegler 117-98 2,038,325 4/36 iVan Cleef 117-68.5 2,451,865 10/48 OBrien 117-122 2,458,166 1/49 Homeyer 117-122 2,593,553 4/52 Francis 117-98 2,905,584 9/59 Dunlap 117-122 3,072,497 1/63 Guglielmo 117-49 3,085,027, 4/63 Porteous 117-163 FOREIGN PATENTS 790,159 2/58 Great Britain.
JOSEPH B. SPENCER, Primary Examiner.
RICHARD D. NEVIUS, Examiner,
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|U.S. Classification||442/38, 442/46|
|International Classification||C09J7/04, C09J7/02, B65D65/40, D04H3/12, D03D15/00, B65D63/10|
|Cooperative Classification||D10B2101/06, C09J2400/263, D03D9/00, D10B2201/24, D03D2700/0133, C09J7/0239, D04H3/013, D03D15/00, D04H3/045, D03D3/005, D04H3/004, D10B2501/04, D10B2401/063, C09J7/04, D04H3/12|
|European Classification||D04H3/004, D04H3/045, D03D15/00, D04H3/013, D03D9/00, D03D3/00B, C09J7/04, C09J7/02K, D04H3/12|