SE469489B - Masking material - Google Patents

Abstract

The invention relates to a flexible masking material which is provided with holes or openings and also has preferably different-coloured and/or different-patterned areas for achieving a camouflage effect, and which material comprises a first layer and a second layer, which two layers are bonded to one another by means of, for example, an adhesive and form two opposite outer layers provided with patterns, in addition to which at least one further layer, for example for reinforcing purposes, is arranged between said first and second layers. The invention is characterized by this combination: a) the first and second layers 10 and 11 forming part of the masking material consist of paper, b) the different-coloured and/or different-patterned areas for the camouflage effect are arranged on those sides of the layers 10 and 11 facing away from one another by printing, c) the perforation or the like of the masking material is carried out by cracking or crushing the material in all or selected areas which are free of reinforcing material. <IMAGE>

Description

469 10 15 20 25 30 -Jwuw _ Y \ 'rFW 489 designated holes require a relatively expensive machine insert, which further makes the final product more expensive.

Thus, yet another object of the present invention is to provide a masking material which is provided with openings or the like of a new kind and which are easy to achieve and whose effect meets the requirements imposed on the masking material.

All these objects are achieved with a masking material of the type specified in the preamble with the features specified in claim 1.

By, as the present invention proposes, using paper as starting material, conditions are created for a basic material produced by conventional methods.

By supplying one side of resp. first and second layers with the desired patterns and / or different colored areas, the desired camouflage effect is achieved in a simple and inexpensive manner. The unprinted sides of said material layers are turned towards each other and joined together with, for example, an adhesive. It is suitable at the same time as this adhesion to apply at least one further layer which then then preferably consists of a reinforcing material, preferably in the form of a net provided with optionally large squares or the like. The laminated product thus obtained then undergoes drying and curing and is then subjected to a cracking or crushing of the material, preferably by passing the material between rotating, studded rollers, thereby forming continuous deformations of the material in the form of a tear-like openings. By adapting such spike rollers to the designated masking material, these tear-like openings are oriented to such optional tops of the material which are free of reinforcing fibers. Through openings designed in the specified manner, the advantage is also achieved that the size of the openings will always be limited by the reinforcement 10 15 20 25 30. '§Vr | “Riff. .lv .w 4 "" .fl w- (] \ VD ÄÄ C w fibers or threads surrounding each free area.

The product produced in a combined process is easily transferred to a storage roll on which the product can be stored and from which, for example, module-adapted lengths can be easily separated.

All in all, a masking material obtained in the manner indicated gives the following advantages. Due to the low basis weight, the product becomes easy to handle, which is of great importance in practical use. The camouflage print is easy to apply without the need for special equipment. Likewise, the special shape of openings is easy to achieve without large machine investments. The end product can be produced in large quantities at low costs. The masking material indicated according to the invention is, for example, very well suited for use in field conditions.

Experience has shown that the product is well suited for multiple use in all weather conditions.

The dependent subclaims state suitable embodiments.

In connection with the accompanying drawing, the invention in exemplary form will be described in more detail below.

Fig. 1 shows in schematic form a cross-section of the masking material according to the invention in a first embodiment; Fig. 2 also shows schematically, a cross-section of the masking material according to the invention in a second embodiment; Fig. 3 shows in plan view and schematically a part of a masking material according to the invention, provided with "openings"; Fig. 4 gives an example of how the masking material according to the invention can be provided with so-called camouflage printing; Finally, Fig. 5 schematically shows a suitable device for producing the desired end product.

Fig. 1 shows the structure of the masking material indicated according to the invention. 10 denotes a first layer of a paper produced in, for example, a conventional paper machine, with each desired basis weight. L1 denotes a second layer of paper, similar to or similar to the first layer denoted by 10. This second paper layer II preferably has the same basis weight as the first layer but can also be higher or lower. The paper layers 10,11 may be creped or uncreped as well as wet strength treated and / or flame retardant treated. Denoted by 12 is a further layer arranged between the paper layers 10, 11, which in this embodiment can be a reinforcing layer in the form of a net provided with regular or irregular squares of, for example, polyester or other material with high or relatively high tensile strength. This reinforcing layer can also be applied in the form of crossed fibers or threads.

Fig. 2 schematically shows the structure of a masking material in a second embodiment, the structure being supplied with a fourth layer 13, which may be, for example, a metallic layer or an insulating layer. The purpose of this fourth layer 13 is to make it difficult to detect an object covered with the masking material within the IR or radar area.

Fig. 4 schematically shows a proposed device for providing the paper layers 10,11 with differently colored and / or differently patterned areas in order to achieve the camouflage effect. The paper web 10 (11) is guided from a unwinding roller 14 over and in contact with a printing unit 15, where one surface of the web is provided with the selected color pattern. This color can be an electrically conductive color in a known manner. The pre-printed paper web is wound on a take-up roll 16. 10 15 20 25 30. 'HH wpqlf' | y i. at 469 489 Fig. 5 schematically shows a preferred device for producing the final product. From opposite material rollers 17 and 18, respectively, the paper web 10 and the paper web 11 are fed past a "glue" 19 and 20, respectively, between counter-pressure rollers 21 and 22, respectively. A feed roller 23 feeds a reinforcing mesh or fiber 24 between the paper layers 10,11. A possible fourth layer is stored on the feed roller 25 and may consist of a metallic layer or an insulating layer 26. The medium in the "glue" can be given properties by additives such as mold-preventing or protective effects against IR and radar (eg metal powder) .

The press rolls 21, 22 press with great force together the paper layers 10, 11 and between these additional layers 24 and alternatively 26 and the web of laminated material 27 which is passed through a drying / curing device 28.

The web of material 27 is then passed between two rotating rollers 29, 30 provided with projecting, suitably conical spikes, the web of material 27 being subjected to a kind of the same continuous tear-like deformation, the configuration of which is illustrated in Fig. 3. These spikes or the like (not particularly shown here, but indicated at 29 ', 30') are applied to the rollers 29,30 in such a way that the force action which the free ends of the spikes direct towards the material web 27 acts only on the selected areas of the material web surface which are free from reinforcing fibers, for example in the center of a box surrounded by reinforcing threads. In this case, a tear center 31 (Fig. 3) is formed, from which different lengths 32 of material material are preferably emanating, through which very irregular openable flaps are also formed between each other for transparency or to reduce wind power. The spikes not shown in more detail on a spike roller 29.30 can also be differently dimensioned to create different pattern effects on the openings.

After the spike rollers, the finished product can be wound on m: vv "i. ~ Fr" 469 489? 6 a storage roll (not shown). Each desired material length is separated from this supply roll.

It is obvious to a person skilled in the art that the width of the material web can be adapted to any desired requirement. For example, material webs with different widths can be stored within a relatively small space. From the above it also appears that a very small personnel effort is required to be able to produce very large volumes of the masking material according to the invention.

Claims (7)

10 15 20 25 30 35 -JmswN lvl-pil '469 489 P a t e n t k r a v A flexible material provided with a flexible hole through openings or openings, which furthermore has different colored and / or differently patterned areas for achieving a camouflage effect and which material comprises a first layer and a second layer, both layers by means of, for example, an adhesive adhered to each other and form two opposite, patterned outer layers, and at least one further layer, for example for reinforcement purposes, is arranged between said first and second layers, characterized by the combination: a) that the outer layers (10 resp. ll) consists of paper, b) that the differently colored and / or differently patterned areas for camouflage action are applied to the facing sides of the layers (10 and 11, respectively) by a printing process, c) that between the outer layers (l0.11) are placed reinforcement material (12) consists of a net in a square shape with high or relatively high tensile strength and that said hole or opening ar are formed by a tear center and cuts extending therefrom and are oriented in all or selected areas of reinforcing fiber or threads. Masking material according to claim 1, characterized in that the paper layers (l0.1l) are subjected to a wet strength and / or flame retardant treatment. Masking material according to one of the preceding claims, characterized in that additives are assigned to the adhesive, for example to achieve a rot protection and / or to achieve protective effects against IR and radar radiation, such additive in the latter case being be metal powder. WIN ”.H I 'F".' 2 4-69 489 10 15 20 Masking material according to claim 1, characterized in that the hole or the like of the material is designed as a tear process and that this tear process is arranged to form a tear center (31), from which preferably different length cuts ( 32) extends to different holes from the said tear center. Hasking material according to one of the preceding claims, characterized in that in addition to the further first layer there is an additional second layer arranged between the paper layers (10, 11), for example a metallic or insulating layer. Hasking material according to one of the preceding claims, characterized in that the constituent paper layers (10, 11) consist of a creped paper. Masking material according to any one of the preceding claims, characterized in that the printed paint is an electrically conductive paint.