FR2474070A1 - METHOD FOR MANUFACTURING A MESH ELASTIC BAND ON RACHEL OR CHAIN, AND BANDS MANUFACTURED THEREBY - Google Patents

Abstract

1. Method for manufacturing an elastic stitched retention bandage on Raschel machine, of the type including a chain made by means of an inextensible yarn associated or not with a not covered elastic yarn, with combination of the yarns in order to cause at least one not covered elastic yarn to work jointly on the same needle with at least one inextensible yarn, and this for a part of the inextensible yarn, said method being characterized in that for obtaining a bandage having particular qualities of softness, inflatability and absorption power, inextensible warp yarns (1a) are caused to work in regular alternance or not with an elastic not covered yarn (2), and inextensible warp yarns (1) are caused to work singly, the method being also characterized in that all the extensible yarns are knitted and that the chains thus formed are connected in a manner known in se by yarns (4) working transversely.

Description

The subject of the invention is a method for manufacturing an elastic band

  mesh on Rachel or chain trades, and the

  strips made by this process.

  The object of the invention is related to the technical sector of care, hygiene, bandages for the human body and for

animals.

  There are known expandable bands made on Rachel or chain trades which consist of a chain of extensible and inextensible son alternated in various combinations. In the transverse direction, weft threads connect the chains. In warp, the different tensions of the extensible or inextensible son plies produce, after manufacture, the withdrawal

  elastic threads and a reminder of the inextensible threads

slow.

  When it is desired that bands have particular qualities

  of sweetness, of "swelling", with a good absorptive

  Gimped elastic threads are used in the chain. That is,

  to say that, in a manner well known per se, the elastic threads

  are surrounded, covered, with a thread called "wire wrapping".

  The wrapping thread is wound helically in A

  turn elastic threads B that we want to guimp, as shown in Figure 1. Or the wrapping thread C is knotted by the mesh around the elastic thread that you want to guimp, as shown in Figure 2. In all cases, one must execute or have executed, before

  to weave the bands, operations of wrapping of the elastic threads.

  These wrapping operations are relatively long and expensive

  and require special equipment.

  According to the invention, it has been desired to improve the qualities of

  Tensile strength of the strips produced using the gimped yarns, greatly simplifying the manufacturing process by eliminating the wrapping, and consequently, improving very

substantially the cost price.

  For this purpose, and according to the method, we use in cha,

  the inextensible threads that make up the chains, we

  together by the same needle at least one elastic thread

  not gimped with at least one inextensible yarn, and this for a part

  inextensible threads, alternating regularly or irregularly

  firstly, inextensible yarns working together with an unsupported elastic yarn, and inextensible yarns working

  only; in any other way known per se, by means of

  valiantly transversely, simple inextensible chains or

  double chains made of extensible and inex-

  sible. The elastic band mesh according to the method of the invention is characterized in that it comprises longitudinally chain inextensible son constituting all the chains, part of the chains, alternately regular or irregular, being constituted by at least one inextensible yarn aforementioned mesh

  together with at least one elastic thread, not gimped.

  These and other characteristics will emerge from the

description which follows.

  To fix the object of the invention, without however limiting it, in the accompanying drawings: FIGS. 1 and 2 show, on a large scale, methods of covering elastic yarns, requiring operations

  that we wanted to eliminate according to the invention.

  Figure 3 illustrates three of the chains of an

  cut according to the method and characteristics of the invention.

  FIG. 4 illustrates several chains of a band according to the invention, in which the frames are threaded full on

  two neighboring chains and interpenetration of the frames.

  FIG. 5 illustrates several chains of a band according to the invention, in which the frames are threaded full on

  three neighboring chains and interpenetration of the frames

  this is shifted by one chain relative to the neighboring frame.

  Figure 6 illustrates several chains of a band according to the invention. wherein the frames are threaded on three neighboring chains and interpenetration frames each of which is shifted by two chains relative to the neighboring frame. The

  single inextensible catnetti and the double

  ble'et and inextensible are alternately regular (alternation 1/1).

  Figure 7 illustrates several chains close to a bank.

  according to a variant of the invention, according to which the transverse connections. chains are not provided by weft threads, but by transverse thrusts of the threads

of chain.

  The object of the invention is made more concrete by describing it without limitation in the form of embodiments illustrated in FIGS.

figures of the drawings.

- 3 -

  It is clear, particularly in Figure 3, in accordance with the procedure

  die of manufacture which has been defined, chains which are all constituted by at least one inextensible warp yarn. Only three chains have been illustrated to simplify the drawing, but it is quite obvious that the strips are constituted by a

  number of chains, variable

  their width. Some of these chains, unitarily or

  in groups, alternating regularly or irregularly, are

  killed by at least one inextensible warp yarn

  jointing with an extensible strand wire 2 not covered.

  For this, the unstretched extensible yarn 2 is made to work according to the same mesh as the inextensible yarn 1a. The sons

  and 2 are not united prior to their passage on the

  tier Rachel or craft chain. The yarns 1 and 2 are simply engaged in the same pellet 3 as illustrated in FIG. 3, and they are made to work together with the same needle and the same

  loops, as shown in Figure 3.

  Inextensible yarns 1 and 1 are of cotton, viscose, or other yarns or natural, artificial or synthetic fibers. All these inefficient sons can be of the same nature or of various natures. For example, the inextensible son 1 and-la may be

of different natures.

  The non-gimped extensible yarns 2 may be elastic yarns

  tomère, gum threads, textured synthetic yarns having

  an artificial elasticity due to their forms.

  The chains may alternatively be 1/1, ie a chain 1 and a chain la-2 alternately, which is a commonly adopted embodiment. However, there may be several gDupes of neighboring chains 1 separated by a

  or several chains la-2. Multiple combinations are possible

  sible. Chains 1 and 2 are connected transversely by

  inextensible / frame forming wires. Figures 4, 5 and 6

  clearly illustrate, as examples, several possibilities for

  threading the frames. In FIG. 4, the frames 4 are strung together by interpenetrating on two neighboring channels 1 and la-2. In FIG. 5, the frames 4 are strung together on three chains.

  neighboring regions, with interpenetration of each frame 4 which is

  a chain with respect to the neighboring frame. In FIG. 6, the frames are threaded on three neighboring chains, with a -4 -

  interpenetration of each frame 4 which is shifted by two chains

  net relative to the neighboring frame. In the three examples, Figures 4-5-6, the single inextensible chains 1 and the

  double chains (expandable and inextensible) are alternating

  regular nance (1/1). The embodiments according to FIGS. 4-5-6 result in bands according to the invention which have more or less dense aspects, different points and capacities.

of different absoption.

  Inextensible weft yarns 4 are made of cotton, viscose, or other natural, artificial or synthetic yarns or fibers. The threads 4 are generally of the same nature, but it is not excluded that

  they can be of various natures.

  In the alternative embodiment which is illustrated in FIG. 7, the weft threads 4 are omitted, and the transverse links of the chains 1 and the 2 are provided by the transverse thrusts of the warp threads, that is, ie either son 1 or son 1a or son 1a and 2 sets. This mode of

  dithering using warp yarns, does not have any

  ficulty for the technician who proceeds, in a manner known in

  itself, thrown from one needle to another.

  The bands according to the invention with screening according to FIG. 7, are denser and heavier, and the execution of the debt can be recommended for the execution of compression bands. However, the manufacturing process is simplified and the tapes are more

economic to manufacture.

  The bands thus executed according to the various modalities de-

  written, shows a definite improvement in the qualities of

  with a significant simplification of the operations of the

  and a very significant decrease in their cost price.

  The bands then undergo ,. after their manufacture,

  appropriation operations (eg retraction) and

  which are known in themselves and which do not enter

not within the scope of the invention.

  The invention is in no way limited to that of its modes of application nor to those of the embodiments of its various parts which have more especially been indicated; she

  On the contrary, it embraces the variants.

-5-_

Claims (1)

  -.- Method of manufacturing a mesh elastic band on   Rachel or chacne, characterized in that it is used in chal-   no inextensible threads that make up the chains, we work together on the same needle. at least one elastic thread not wrapped with at least one inextensible thread, and this for part of the inextensible threads, alternating regularly   or irregularly inextensible son working together   with an unsupported elastic yarn, and inextensible yarns working alone; in any known manner, transverse threads are connected to the simple inextensible chains or the double chains of extensible wires. and inextensible.   -2- A method according to claim 1, characterized in that the chains are connected transversely by inextensible son forming frames.   -3- Process according to claims 1 and 2, characterized by 1 '   stringing full of frames interpenetrating on two channels   neighbors (inextensible) and double (extensible and inextensi- corn).   Process according to claims 1 and 2, characterized by 1 '   threading full of frames on three neighboring chains with a   interpenetration of the frames each of which is shifted   net compared to the chain next to the simple chains   and doubles being alternately regular.   Process according to claims 1 and 2, characterized by 1 '   threading the wefts on three neighboring chains, with   penetration of each frame which is shifted by two chains with respect to the neighboring chain, the single and double chains being alternately regular.   -6- Mesh elastic banle performed by the following method   any of claims 1, 2, 3, 4 and 5, characterized in that   that it comprises longitudinally chain inextension wires   all of the chains, a portion of the chains, alternately regular or irregular, being constituted by at least one inextensible yarn supra meshed together with the   less a naked, unsupported elastic thread, untimely weft threads   sibles connecting single and double chains.   -7- A method according to claim / characterized in that the chains are connected transversely without the use of son of   weft, by the transverse throws of warp threads.   -8- Ba-elastic mesh performed by the method following the   claim 7, characterized in that it comprises longitudinally   In a chain of non-extensible son constituting all 10 chalnettz, a portion of the chains, alternately regular or irregular, being constituted by at least one aforesaid inextensible yarn meshed with at least one naked elastic thread,   unsheathed, inextensible warp yarns or unex-   combined, which are worked transversally   the links of the single or double chains.   Mesh elastic band according to any of the claims   cation, characterized in that the inextensible strings of chain,   and the inextensible weft threads when there are, are in co-   tone, viscose, or other natural, artificial or synthetic yarn or fiber, while unsupported stretchable yarn is   elastomer yarns, rubber yarns, synthetic textile yarns   turés having an artificial elasticity due to their forms.