EP0119184A1 - Double plush weaving process - Google Patents

Abstract

The pile thread bonding structure is intended for weaving a double-shot (ie. two-shed) pile fabric, cut on the loom to produce two cut pile fabrics with woven-in two-sided pattern. In the existing structure, e.g. using five pile warp threads (I-V), the same pile warp threads are woven into the upper and into the lower fabric and usually equally divided between them, i.e. all threads (I and II) and the odd-numbered threads (III) in one, and threads (IV) and (V) and the even-numbered threads (III) in the other fabric. In the present structure, the number of pile threads is doubled and all odd threads of both warps are bonded into one, and all even threads of both warps into the other fabric, whilst the pattern-forming pile threads, are bonded around each weft thread of the two base fabrics. Weaving double-shot (i.e. two-shed) cut pile fabrics with woven-in two-sided pattern. If both fabrics are woven with the same weft density, the arrangement provides a pile density which is double that of the existing structures as the pile threads are bonded around each weft thread. The pattern obtd. does not contain thread mix errors at pattern boundary transitions.

Description

This invention relates to a new and original weaving process of double sided double shuttle carpets, with visible design on the obverse.

The object of the invention is in particular to describe a double pick binding which has the result of perfectly binding the pile threads to the background fabric.

The expression "double shuttle" designates a textile structure which is woven on a loom having two crowds one above the other while the expression "double face" indicates a technique according to which one weaves the one above the other two background fabrics, but at a certain distance from each other, the two pile fabrics then being separated from each other on the loom.

By "number of pile threads" should be understood the number of different systems linking the pile threads or the number of pile-forming warp threads per unit of chain. A chain unit is represented by a rope when charting. Each hair chain is generally a different color from the other hair chains. In addition, the hair chains may themselves have a number of different shades.

The weaving is carried out in such a way that, depending on the design (generally), a pile-forming warp thread connects the two fabrics: the other threads, this pile, not forming a pattern, are woven in the lower fabric, but generally in the fabrics. upper and lower. This therefore means that these threads will continue to be part of the lower fabric, respectively of the upper fabric.

The expression "visible design on the back" means that the design is perfectly visible on the back of the carpet. In the structures known to date, of the conventional type, the pile threads only bind around the outer picks (weft threads) of the background fabric. The other picks are only used to fix the pile in the background fabric as well as for the incorporation in the background fabric of the pile threads not participating in the formation of the design.

To successfully incorporate the pile threads into a background fabric the picks of each background fabric must be woven in two separate layers. The pile threads which do not participate in the formation of the design can then be incorporated in a more or less rectilinear manner. They then have the same function as the high tension chain.

The object of the invention is to remedy the disadvantages of the weaving techniques known to date in the field of double-sided, double shuttle, incorporated carpets.

To achieve this objective, in accordance with the invention, a pile of hair is tied around all the yarns in this weft and the base fabric have, per unit of warp, at least one high tension warp yarn for two tying warp yarns.

Other advantages and features of the invention will emerge from the description which will be given below of a weaving process according to the invention. This description refers to the attached figures.

• Figure 1 shows a weaving diagram of a fabric according to the invention.
• FIG. 2 is a weaving diagram of a fabric obtained according to the double pick technique and in which all the weft threads do not bind pile threads.
• FIG. 3 is a diagram for smoothing a fabric obtained according to the triple pick technique and in which all the weft threads do not bind pile threads.
• FIG. 4 is a diagram of this weaving of a fabric by which all the weft threads bind pile threads but in which the warp threads with high tension are missing.

This is not the case in the conventional double pick binding shown in FIG. 2, as in the binding which is the subject of the invention and which is shown in FIG. 1.

In the other conventional double-sided double shuttle carpet structures, in particular the three-pick bonding shown in FIG. 3, the bonded pile threads are also found between two layers of picks. In the lower fabric, these are the layers formed by picks 2 and 3: in the upper fabric, these are the layers formed by picks l 'and 3'. The two layers mentioned above are even used here only for bonding the pile threads. The third layer of pick, designated by the references 1 in the lower fabrics and by the references 2 'in the upper fabrics, constitutes the outer layer of each carpet. The pile threads which form the design are therefore tied around this outer layer which makes the design appear on the back of the carpet.

You can also bind the pile threads in a fabric that does not meet these conditions. Such a structure is shown in Figure 4. In this structure, the high tension warp son are absent, which causes the picks to be presented in a single layer. The non-hair forming threads are simply woven with one of the chains of the background fabric which are also bonding chains (indicated by the letter B in FIG. 4). This gives rise to a large incorporation of threads, therefore to a large consumption of pile threads, which is very disadvantageous. An even greater disadvantage is the fact that the back of such a carpet structure leaves much to be desired. On the one hand, the drawing on the back is very imprecise because of the pile threads. which are also visible on the back. On the other hand, the binder pile threads will very easily form loops on the back.

• 1° pour une même densité de trame on obtient
  • - une densité double du poil par rapport aux structures représentées aux figures 2 et 4;
  • - une densité de poils triple par rapport à la structure représentée à la figure 3;
• 2° le dessin ne fait plus apparaître de contour mélangé. Ceci est le cas dans la structure représentée à la figure 2. On entend par "contour mélangé" des fautes qui impliquent la netteté du dessin. Ces fautes sont représentées par de petites flèches dans la coupe selon la figure 2;
• 3° pour une densité de poils égale on obtient :
  • a) - production double par rapport aux structuresreprésentées aux figures 2 et 4,
  • b) - production triple par rapport à la structure représentée à la figure 3,
• 4° les fils de poil incorporés présentent une incorporation plus faible que dans la structure sur la figure 4. De plus,le dessin au dos est plus net que dans le cas de la structure représentée par la figure 4. Ce problème a déjà été abordé lors de la description de l'état antérieur de la technique à propos du tissage double face à deux navettes.

The new carpet structure described here, shown in longitudinal section in FIG. 1, aims to achieve the following advantages compared to the structures known to date and which come closest to it:

• 1 ° for the same frame density we obtain
  • - A double density of the hair compared to the structures shown in Figures 2 and 4;
  • - A density of hairs triple compared to the structure shown in Figure 3;
• 2 ° the drawing no longer shows a mixed outline. This is the case in the structure shown in FIG. 2. By "mixed contour" is meant faults which imply the sharpness of the drawing. These faults are represented by small arrows in the section according to Figure 2;
• 3 ° for an equal hair density we obtain:
  • a) - double production compared to the structures shown in Figures 2 and 4,
  • b) - triple production compared to the structure shown in Figure 3,
• 4 ° the incorporated pile threads have a lower incorporation than in the structure in FIG. 4. In addition, the drawing on the back is sharper than in the case of the structure represented in FIG. 4. This problem has already been addressed during the description of the prior art concerning double-sided weaving with two shuttles.

In order to achieve the aforementioned advantages, use must be made of a number of pile threads double compared to usual structures. Thus in the usual structures the "incorporated pile threads", that is to say the pile threads which do not participate in the formation of the design, are taken up there in the background fabric. The distribution usually takes place according to Scheme 5 _0/50 and this such that it is always the same channels of bristles which are set respectively in the upper and lower fabrics.

In the structure which is the subject of the invention, the number of pile threads per pile chain is doubled. The tying takes place in such a way that all the odd pile threads of each pile chain bind in one of the fabrics and that all the even pile threads of each pile chain tie in the other fabric. The binding of the pile threads forming the design is carried out around each pick of the background fabrics, as clearly shown in FIG. 1.

To clearly show the binding of the pile threads, the two layers of picks from each background fabric have been represented in the successive order of weaving. This successive order of weaving is represented by the references 1-1 ', 2-2'. In reality, the picks are placed during and after weaving as follows: 1 above 2 in the lower fabric 2 'above the in the upper fabric.

• a) liage de tous les fils de trame avec un fil de poil ;
• b) prévision dans le tissu de fond d'au moins un fil de chaîne à forte tension pour deux fils de chaîne de liage par unité de chaîne.

The invention must therefore be seen in the combination of the two characteristics below

• a) bonding of all the weft threads with a pile thread;
• b) provision in the background fabric of at least one high tension warp thread for two tying warp threads per unit of warp.

Claims (2)

1. Weaving process of double sided carpet with double shuttle, characterized in that a pile thread is tied around all the weft threads (1-2 and the -2 ') and in that the background fabric has, per chain unit, at least one high tension warp thread (S) and two tying warp threads (B). 2. Carpet or velvet fabric obtained by applying the method according to claim 1.

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