EP0364820A1 - Camouflage covering and process for its manufacture - Google Patents

Camouflage covering and process for its manufacture Download PDF

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Publication number
EP0364820A1
EP0364820A1 EP89118464A EP89118464A EP0364820A1 EP 0364820 A1 EP0364820 A1 EP 0364820A1 EP 89118464 A EP89118464 A EP 89118464A EP 89118464 A EP89118464 A EP 89118464A EP 0364820 A1 EP0364820 A1 EP 0364820A1
Authority
EP
European Patent Office
Prior art keywords
camouflage
fact
layer
supporting sheet
weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89118464A
Other languages
German (de)
English (en)
French (fr)
Inventor
Antonio Santin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MOLDIP SpA
Original Assignee
MOLDIP SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MOLDIP SpA filed Critical MOLDIP SpA
Publication of EP0364820A1 publication Critical patent/EP0364820A1/en
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
    • D06N3/0065—Organic pigments, e.g. dyes, brighteners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H3/00—Camouflage, i.e. means or methods for concealment or disguise

Definitions

  • the present invention concerns a camouflage covering of the type comprising a supporting sheet on which at least a coloured camouflage layer is applied, and the process for obtaining said camouflage covering.
  • camouflage coverings in the form of sheets or nets are used, said coverings being suitable for covering the surface of the objects to be camouflaged.
  • camouflage coverings are mainly constituted by a supporting sheet of flexible material, such as textile or plastic material on which at least a camouflage layer of various colours is applied, for instance through a silk-screen process.
  • the camouflage layer has the purpose of giving a visual appearance to the supporting sheet which is as like as possible to that of the ambient where there are the objects to be camouflaged.
  • camouflage coverings must necessarily have, as essential characteristics, a high flexibility to easily conform to the shape of the objects to be covered, as well as, for obvious reasons, a good tear resistance. Moreover, the camouflage coverings must be formed in such a way as to preserve unchanged in time their characteristics of mechanical resistance and their chromatic aspect. Moreover it is to be noted that the camouflage coverings, when not utilized, are often folded and put, for instance, inside the vehicles whereon use is to be made.
  • the material mostly used for obtaining camouflage coverings is polyvinylchloride (PVC).
  • PVC PVC is often foreseen to obtain both the supporting sheet and the camouflage layer applied thereon.
  • the PVC is only used for the camouflage layer.
  • plasticizers is made necessary to give a sufficient viscosity to PVC which is applied on the supporting layer through a silk-screen process, in the form of a camouflage layer.
  • plasticizers As regards the plasticizers, it is noted that with the passing of time and above all in conditions of quite high room temperature, they tend to "exude” from the camouflage covering.
  • plasticizers are in general constituted by oils or anyhow by easily inflammable substances, their use requires the installation of expensive plants in the places where the camouflage coverings are manufactured, for removing the vapors or avoiding fire risks.
  • camouflage coverings made according to the known technique involve also different problems when they have to be purified.
  • the purifying processes usually utilized make use of caustic soda, combined with solvents as methylcellosolve or ediethylentriamine that easily attackes PVC, altering consequently the technical-functional characteristics of the camouflage coverings.
  • the main object of the present invention is that of overcoming the above said drawbacks and consequently of obtaining a camouflage covering which has a high flexibility and a high mechanical resistance without making recourse to the use of plasticizers and solvents so as to maintain unchanged in time its technical-functional characteristics and does not alter in consequence of purifying processes carried out with caustic soda or the like.
  • the basic inventive concept is that of obtaining a camouflage layer by making use of an aqueous dispersion of polymers in place of PVC used in the known technique.
  • aqueous dispersions of polymers are per se known but their use in preparing the camouflage coverings, with all the deriving procedure alternatives, is novel and has never been suggested or described previously in relation to the drawbacks that it is desired to overcome.
  • a camouflage covering of the type comprising a supporting sheet on which at least a coloured camouflage layer is applied, characterized by the fact that all colours of said camouflage layer are formed by an aqueous dispersion of polymers.
  • Said camouflage covering is manufactured, always according to the present invention, by means of a process comprising the following steps: a) to apply on a flexible supporting sheet a many-coloured camouflage layer of which all colours are formed by an aqueous dispersion of polymers; b) to dry the camouflage layer applied on the supporting sheet; c) to cure the camouflage layer.
  • reference numeral 1 indicates the whole apparatus for obtaining camouflage coverings in accordance with a process according to the present invention.
  • Said process foresees at first a step wherein at least a many-coloured camouflage layer is applied on a flexible supporting sheet 2, for instance constituted by a fabric of nylon or other suitable material; all colours of said layer are formed by an aqueous dispersion of polymers.
  • this step is made by subjecting the supporting sheet 2 to the action of a plurality of silk-­screen rollers 3, each one having the task of applying a determinate colour.
  • the silk-screen rollers may be arranged on different rows, staggered and spaced from one another.
  • polymers to be used for the named aqueous dispersions the following ones can be mentioned: polychloroprene, chlorsulphonated polyethylene, chlorinated polyethylene, halogenated polybutyl, polyurethanes, epichlorohydrinic elastomers, acrylic elastomers, nitril elastomers, carboxyl elastomers, polycarbonates, silicone elastomers and so on.
  • the aqueous dispersion contains also proper additions of various substances necessary to give determinate physical-mechanical characteristics to the camouflage layer, either to obtain the required properties at the finished product, or to facilitate the application of the camouflage layer.
  • stabilizers include stabilizers, protective agents, antiblocking agents, antiscratch agents, pigments, wetting agents, opacifiers, antifoaming agents, thickening agents, cross-linking agents, cross-linking activators, accelerators and so on.
  • the quantities of these substances are conveniently comprised between 0.5 to 10 parts by weight for 100 parts by weight of polymer, except for the pigments whose quantities are comprised between 40 and 100 parts by weight for 100 parts by weight of polymer.
  • the pigments used to obtain the desired colorings can be of inorganic type as for example the titanium dioxide, iron oxides, cadmium sulphides and/or of organic type as for example the ptalocyamines.
  • the thickening agents are comprised between 1 and 10 parts by weight for 100 parts by weight of polymer.
  • the viscosity of the latex polymers that can be used for the purposes of the present invention can vary from 500 to 3000 Centipoises.
  • the overall viscosity of the compound containing the base polymer and the other substances, in particular for forming the camouflage nets through the silk-screen processes can vary from 5000 to 15000 Centipoises.
  • the known viscosimeter is formed by a support on which a variable speed steel shaft is assembled.
  • the shaft is immersed in the solution and indicates on a graduated scale the viscosity value which is given by the force necessary to rotate the shaft itself at a known speed.
  • the application of the camouflage layer is followed by the drying step which is made in a drying chamber 4 at a temperature of the order of 100-120°C during which the camouflage layer is dried.
  • the camouflage layer is subject to the curing step.
  • the product passes accross a curing chamber 5 inside which it is subject to a temperature of the order of 150-170°C, so as to determine the cross-linking of the camouflage layer thanks to the action of the cross-linking agents present therein.
  • camouflage layer on both surfaces of the supporting sheet 2 is possible. Consequently, at the end of the curing step the product can be subject to a second application of a camouflage layer on the surface not yet treated and, to a second drying process and a second curing step.
  • the product is subject to the second application of the camouflage layer, to the second drying step and consequently to only one curing step wherein the cross-­linking of both camouflage layers applied on the two surfaces of the supporting sheet 2 takes place.
  • the fabric is sent to the apparatus shown in figure 2 to obtain at least a many-coloured layer applied on the basic colour which is softer with respect to the other ones.
  • the base polymer can be dispersed in water and comprise such characteristics as to have a determinate dry content, for instance of 40% or 60% or also the base polymer could be a ultrapure liquid elastomeric polymer in the dry state.
  • the present invention achieves the aimed purposes.
  • the camouflage layer associated to the camouflage covering forming the object of the present invention is applied without the aid of solvents and in the substantial absence of plasticizers.
  • substantially absence of plasticizers is intended to indicate the fact that to improve the flexibility of the cross-linked film after the water drying, it would be possible to add from 1 to a maximum of 10 parts by weight of plasticizers every 100 parts by weight of base polymer.
  • the camouflage layer obtained as disclosed still has excellent characteristics of flexibility, elasticity and tear or break resistance.
  • camouflage coverings obtained in accordance with the present invention will have improved characteristics of use reliability in time, since they will not be subject to alterations determined, in the known camouflage coverings, by the escape of the plasticizers, present also up to 200 parts for 100 parts by weight of PVC, due to the exudation.
  • camouflage covering described in respect of at least a many-coloured layer could comprise a limited numer of colours up to a minimum of one colour.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)
  • Paints Or Removers (AREA)
EP89118464A 1988-10-21 1989-10-05 Camouflage covering and process for its manufacture Withdrawn EP0364820A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2239888 1988-10-21
IT8822398A IT1230591B (it) 1988-10-21 1988-10-21 Copertura mimetica e procedimento per la sua fabbricazione.

Publications (1)

Publication Number Publication Date
EP0364820A1 true EP0364820A1 (en) 1990-04-25

Family

ID=11195758

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89118464A Withdrawn EP0364820A1 (en) 1988-10-21 1989-10-05 Camouflage covering and process for its manufacture

Country Status (2)

Country Link
EP (1) EP0364820A1 (it)
IT (1) IT1230591B (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995005285A1 (en) * 1993-08-17 1995-02-23 Perstorp Ab Printing method, material printed thereby and a process of making a printed material
DE29716362U1 (de) * 1996-09-14 1998-01-08 Ploucquet C F Gmbh Wärmetarnplane
WO2002046285A1 (en) * 2000-12-08 2002-06-13 Pool Abdul Kader Electromagnetic energy adaptation material

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3041797A1 (de) * 1979-11-08 1981-05-21 Hiraoka & Co., Ltd., Tokyo Ultraviolettstrahlen reflektierendes, weisses verkleidungsmaterial
GB2147978A (en) * 1983-10-13 1985-05-22 Hoybond Limited Chemical camouflage method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3041797A1 (de) * 1979-11-08 1981-05-21 Hiraoka & Co., Ltd., Tokyo Ultraviolettstrahlen reflektierendes, weisses verkleidungsmaterial
GB2147978A (en) * 1983-10-13 1985-05-22 Hoybond Limited Chemical camouflage method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995005285A1 (en) * 1993-08-17 1995-02-23 Perstorp Ab Printing method, material printed thereby and a process of making a printed material
DE29716362U1 (de) * 1996-09-14 1998-01-08 Ploucquet C F Gmbh Wärmetarnplane
WO2002046285A1 (en) * 2000-12-08 2002-06-13 Pool Abdul Kader Electromagnetic energy adaptation material
US7344661B2 (en) 2000-12-08 2008-03-18 Scott Allan Kuehl Electromagnetic energy adaptation material

Also Published As

Publication number Publication date
IT8822398A0 (it) 1988-10-21
IT1230591B (it) 1991-10-28

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