SE432830B - MASKING DOUBLE WITH SUPPORTED AND INCORPORATED PLASTIC WINNER COATING - Google Patents

Description

, .__ ____.._.__..__.___._.__.._._: _ í _. <, _....._..-_._...-__ 7709988-5 av fibers or pieces of wire in an irregular orientation, these fibers or pieces of wire being bonded to each other by friction, by means of a. adhesives, heat treatment (plastic welding, etc.) and / or in a similar manner, whereby several such bonds can be used simultaneously with each other, usually bonding by both friction and gluing. By "straight stitch" is meant a stitch, which is not intended to fasten fabrics or the like. or chewing gum.

For various known reasons, most masking cloths are made with a support net. In some cases, masking cloth without a support net or with a reinforcement baked into the cloth in the form of a baked support net or fabric is also suitable, but the invention does not relate to such cloths.

Attaching the decoration to the support net constitutes a well-known problem, which has been solved in various ways. Naskeringsduk with support nets must be able to be dragged over uneven terrain, on which there may be sharp boulders, tree stumps, ice edges and the like. and must also be able to be drawn over objects, which must be masked and have protruding edges and tips.

All this and other things mean that high demands must be placed not only on the masking cloth as such but especially on the attachment of the decoration to the support net, especially if the decoration - as is almost always the case - must be and is provided with.ditsar (leaf cutting, etc.) or holes or spaces between different decoration pieces. Decoration and support nets also usually consist of different materials, e.g. polyvinyl chloride resp. polyester.

It is known to attach the decoration to the support net by gluing, welding, by means of metal staples and by tying or "sewing" by hand by means of a single needle thread in such a way that it forms a kind of spiral (helix) around a support net wire and that on the same. fixed garnish fabric portion. This type of attachment is approximately similar to the stitch type 205, 244 or 506 according to the Swedish standard SIS 85 01 04, proposal of 10 April 1977, edition 4. For a description of different stitch types, reference is made below to the said standard, which both describes and shows; stitch type and threading.

Many times you need a masking cloth with a support net where the cloth does not need to be used many times or does not need to have a very long service life, ie it does not often need to be taken off and on objects to be masked. Such cases are very common, which does not need to be explained in more detail. In such cases, conventional masking cloths with support nets as well as masking cloths with heavy embedded reinforcement are both unnecessarily expensive and unnecessarily heavy, the latter point of view being of particular importance in cases where the cloth can be worn for longer wigyillww fl wmi * "material time or in defensive external conditions. (difficult terrain, over ice, etc.) or possibly be able to be thrown after use.

The invention according to the main or side requirement makes it possible to create a light and inexpensive masking cloth for such and other purposes.

In simple words, the invention can be said to mean that the decoration, instead of being sewn or tied to a support net in a known manner, is provided with so-called straight seams in much the same way as in the case of mat-laced ("knitted") textile products, these seams being such that they simultaneously act as a support net.

Examples of the inventive object are described below.

The decoration of a masking cloth consists of a thin felted cloth (definition see above) of spunbonded polypropylene or polyester fibers with adhesive bonding. Suitably fibers of different colors are mixed with each other and the fabric is suitably provided with a e.g. sprayed mask- The decorative fabric is cohesive but torn on other These can also be This decoration ring pattern. places, so that irregular tabs are formed. regular with a leaf-cutting pattern according to Rüter. can in a known manner also be designed for infrared masking and for radar masking according to Swedish patent 7204394-6 (corresponding to US 5,755,606, DT 2,154 EHQ and others), the electrical surface resistance required according to this patent (resistance measured between two parallel side edges of a square surface piece of any size) is the high-frequency resistance of the finished, slotted and / or hole-punched decoration for radar frequencies (wavelengths below approx. 20 or 15 cm). Before the decorative fabric is torn or the like, it therefore of course has a lower surface resistance than the önslzadae.

Throughout this decoration, straight seams are sewn, by which, as is well known, sewing together a fabric for something is meant seams which are not intended for anything else, not even by oneself, e.g. by folding. Such seams'? Qy also "smooth" or "empty" seams. Such seams sight ïßïamz fifi mi, distance from each other and in different directions, so that dr n .I-: m ._f.-. Fl! __ j »]. I_" 5. ' intersect and form a square or rectangular checkerboard pattern (chessboard pattern, etc.) or a pattern composed of triangles, in the latter case possibly so that a seemingly visible fi edge pattern (hexagonal pattern) is obtained ~ Other patterns are also conceivable in depending on the size of the masking cloth, the decoration and the sewing threads at the square or rectangle pattern for the (gernetc) nature of the seams, the distance between two consecutive, non-intersecting seams is more often chosen between g and about FO cm, preferably between? and 7709988-5 L »15, whereby the side length of the squares or the long side length of the rectangles should be within the same dimensional range. In most cases rectangles of about 8 times 12 are very suitable. For three seam directions with a triangular pattern, the side length should be triangular and equilateral triangles, the longest side length should preferably also be selected within the above range.

Since the masking fabric should usually be quite large and preferably be able to be made in long webs, the seams cannot be of any type of stitch, and in addition the seams must meet other requirements or at least wishes. Among other things, but not only, for manufacturing reasons, seams with bobbin thread (shuttle thread) are often less desirable.

It must not be possible to scratch the seams. Above all, they must be able to be sewn across the strongly slit, soft and thus flabby decoration fabric, which can therefore not be completely flat everywhere during ongoing sewing work. In this type of decoration in particular, it must be borne in mind that the seam must also extend through the openings in the decoration and thus must be able to be sewn "through air". The seam as well as the sewing thread itself (the yarn) must also meet fairly high requirements for strength, light and weather resistance, etc. in much the same way as a conventional support net of known masking fabrics.

A particularly suitable seam consists of a three-thread, possibly two-thread, chain seam without bobbin thread of monofilament (monophilic) polypropylene or polyester or dark-colored, preferably black, polyamide (uncoloured or light polyamide has insufficient light resistance). The individual sewing threads can have a diameter of about 0.4-0.8 mm. Even multi-fiber (multifilament) spun or twisted seam threads can be used onh in that case with a slightly larger diameter than when using monophilic threads for the same kind of masking cloth, if not the required stiffness of the seams, which must be neither too high nor too low as the case may be. becomes too low.

Other suitable stitch types are those from stitch class 100 (single chain stitches), 500 (shuttle stitches) and 400 (two- or multi-thread chain stitches) according to the said standard 85 01 01, however, it should be noted that stitches according to class 500 are shuttle stitches, which thus require bobbin thread (shuttle thread) and i.a. a more complicated sewing machine than for under-thread-free stitches. When sewing with large decorative fabrics, which due to strong flapping and / or for other reasons are very sloppy, it can be more rational or even necessary not to move the fabric in relation to a stationary sewing machine, which should of course be a so-called industrial sewing machine, without moving the sewing machine or its active portion relative to the stationary trimming fabric in that case. However, the invention is also useful for a garnish consisting of numerous different loose pieces of fabric (as mentioned in the introduction, "fabric" also means plastic foil and other foil-like material). If no special measures are taken, it would be very difficult and require quite a great skill to create a masking cloth according to the invention with such a decoration. This problem can be solved as follows.

The decoration pieces are attached, preferably glued, in the desired arrangement on paper, after which the seams can be sewn in much the same way as if the decoration were continuous. The paper can be of the cheapest kind and such that it can either be easily torn away or dissolved after the masking cloth has been completed, or by it having to wear itself when using the masking cloth, in which case the paper should be provided with a masking pattern or should be made in masking or environmentally neutral color. There are known machines which are suitable for attaching loose pieces of paper or cloth in the desired device to a substrate.

Instead of paper, a plastic film of an easily degradable plastic type may be used. Alternatively, you can use thin, fairly loose textile fabric or a textile fabric of the gas or sparse chiffon type. However, the mesh widths can be larger than with ordinary gas, chiffon or similar textile materials. Such fabric does not necessarily have to be removed after the fabric is made, but may be such that it does not significantly impair the masking effect and eventually, to the extent that the fabric is worn, t.o.m. can increase the masking effect by being torn at and we Due to the use of the masking cloth for its purpose.

Finally, it is conceivable for loose decoration pieces to be attached at a desired mutual distance to a string (yarn) or ribbon. If you make a larger number of such bands or a single long flat zigzag weight band, you can then connect these bands resp. bandpartior med var- undr ~ ”snön at? across them sew seams in accordance with what is described above. These bands or strings can then replace the straight seams in the ana coordinate. “Ikting fi n or may alternatively be easily destructible, possibly self-destructive as just described and must in that case be supplemented with seams in accordance with what has been described above.

Claims (8)

7709988-5 Patent claims Masking cloth, consisting of a support net and attached to it a masking foil-shaped decoration of plastic foil, namely and / or synthetic textile materials, characterized in that the support net consists of non-scratchable seams, which are sewn across the decoration and any openings in it and are sewn only through the decoration resp. air and thus not through any substrate. 0 ' Fabric according to claim 1, characterized in that the seams are sewn with stitch type from stitch type class 100, 300 or H00 according to SIS 85 01 01 edition 1, proposal of 10 April 1977. Cloth according to claim 2, characterized in that the seams are sewn with chain stitches according to class 400 without bobbin thread (shuttle tent thread). Cloth according to one of the preceding claims, characterized in that the seams cross each other and form a checkerboard pattern with square, rectangular or triangular squares. Fabric according to one of the preceding claims, characterized in that the sewing threads are monophilic polyester or polypropylene threads. Cloth according to one of the preceding claims, characterized in that the decoration consists of fabric provided with slits and / or openings of felted bonded polyester fibers. 7. A method of making a masking cloth, which consists of a support net and attached to it masking foil-like decoration of plastic foil, natural and / or synthetic textile materials, characterized in that strong non-scratchable seams are sewn across the decoration and any openings in the same to form the support net and thereby sewn only through the decoration resp. air and thus not through any substrate. V 8. A method according to claim 7, characterized in that the seams are sewn with two- or three-thread chain stitches without bobbin thread (shuttle thread).