FR2627515A1 - METHOD FOR AVOIDING Fraying of the edge of a knitted fabric - Google Patents

Abstract

A method of preventing the edge of knitted fabric from unravelling comprises the steps of knitting at least two courses (12) forming the edge of the knitted fabric with a double yarn consisting of a melting yarn (14) and a heat-shrinkable yarn (15) and subjecting the knitted fabric to heat treatment at a temperature at which the melting yarn melts and the heat-shrinkable yarn shrinks but does not melt. A border course (10) of water-soluble yarn (17) may be included. The course (12) may be knitted with smaller loops than the fabric courses (1).

Description

The present invention relates to a method for preventing the fraying of the

  edge of a knitted fabric after this knitted fabric has been removed from a knitting loom or after sections of knitted fabric constituting lengths of clothing are separated from each other. The knitted fabric is formed by intertwining a thread or threads in continuous rows of stitches, so that each row of stitches is suspended from the one immediately preceding it. When the knitted fabric,

  thus formed, is removed from the knitting loom, it is pos-

  likely that the knitted fabric will fray because the mail-

  the ones in the last row are not fixed.

  When a continuous knitted fabric comprising lengths of clothing, such as a fabric comprising successive bodies of sweaters linked to each other, is

  subdivided into individual clothing sections by re-

  line of the separation threads, when the fabric constituted by

  lengths of clothing has been removed from the tri-loom

  dimension, the edges of the clothing sections may

  the pieces fray, if the stitches of the last rows

  sections of clothing are not attached.

  Various methods have been proposed to avoid that

  the edge of a knitted fabric frayed.

  Japanese Patent Provisional Publication No. 51,122,532 describes a method of finishing the upper part of the glove rib in which the last row or the last rows of the upper rib are formed by means of a fusible wire or d 'a wire containing fusible fibers, the fusible wire or the wire containing fusible fibers, which form at least the stitches of the last row,

  being melted using a heat setting process

  at least that the stitches of the last row at least adhere-

  go to the meshes of the adjacent row. In this process

  thermoforming, the meshes are flattened by compression

  when heated, which means that mail-

  firmly adhere them to the stitches of the adjacent row.

  However, the flattened stitches are likely to come off the stitches of the previous row and the mails are likely to break at the weld points, when the stitches are flattened simply by compression. Japanese patent publication N 57-17992 describes a method for preventing the stitches of a weft knit from fraying, in which a heat-shrinkable wire

  is inserted in the last row or in several last

  last rows of weft knitting, in addition to a thread forming

  the rest of the previous rows of weft knitting, the tri-

  cot weft then being subjected to heat treatment to cause the heat-shrinkable wire to shrink

  so that the needle stitches are tied to the mail-

  them in heat shrinkable wire. But in this process the needle stitches, which are linked to the heat-shrinkable wire stitches, are held in place simply

  by a friction engagement with the stitches of the ran-

  previous gée, and the meshes of the preceding row have a dimension which allows these meshes to be released easily from the meshes of the preceding row. It is therefore possible that the meshes are released from the meshes of

  the previous row, if the stitches of the last row

  are pulled, causing the fabric to fray.

  Japanese patent publication N 60-52222 describes another method for preventing a knitted fabric from fraying, in which the reinforcement of the edge of the knitted fabric is formed by a drawn connecting thread, constituted by a first thread which is a thin wire, which adheres to heat, a second wire which is a thin heat-shrinkable wire capable of stretching at temperature

  ordinary, and a third general thread, this thread being

  mé by covering the second wire by the third wire and covering the second and third son by the first wire. Then, the knitted fabric is heated, after having been removed from the knitting loom in order to retract the heat-shrinkable yarn, so that the stitches of the edge reinforcement retract, and to bind the stitches in connecting thread in part with molten wire, which adheres to heat. But this process needs a wrapped thread,

  made using two wrapping processes.

  Such a wrapped yarn is expensive. In addition, since the third wire is covered by the wire which adheres to the heat, the third wire crepes by itself but does not shrink when heated. The connecting wire therefore becomes swelling when it is heated. This process is therefore not entirely satisfactory for preventing the stitches from coming off the stitches of the previous row without lengthening

thread.

  Japanese patent publication N 61-17938 describes another method for preventing fraying, in which a set of successive rows, comprising the last row of a knitted fabric, is formed by means of a stretchable knitting yarn formed by twisting of a core and elastic thread and a thick thread which does not melt

  and which is not heat-fixed in one direction, and therefore

  in this twisted wire, as well as another fusible wire in

  the opposite direction, then the set of rows forming the

  edge of the knitted fabric is heated so that only the fusible strands of the stretchable thread bind to each other. This process, like the previous process, uses

  an expensive wrapped yarn that increases the fabric of the three-way fabric

  side, and as the quantity of fusible wires in the wire

  knitwear is weak, the quality of the binding

  its stretchable knitting yarn is not satisfactory.

  An object of the present invention is to provide

-2627515

  a method to avoid fraying the edge of a fabric

  knitted-or edges of individual clothing sections-

  the, separated from a knitted fabric forming lengths of clothing, capable of preventing the stitches of the rows intended to prevent the fraying from coming off the interlaced stitches of the adjacent rows, preventing a

  increased hardness of the edge of the knitted fabric and allows

  so much to get a knitted fabric whose edge-is soft and

  flexible, without using a swelling wire such as a wrapped wire.

  According to the present invention, at least the last two rows (normally two rows are suitable) of the edge of the knitted fabric are formed by means of an edge forming thread, namely a double thread, consisting of a fusible thread and a thread. heat shrink, the fabric

  knitted fabric is subjected to a heat treatment at a temperature

  scratch at which the wire: fuse blows but the thermo-wire

  retractable does not melt, so that the mesh

  guilles and meshes formed by the plate of a set

  ble of rows formed by the edge forming wire are caused to retract and adhere by fusion to prevent the needle stitches of the last row from

  loosen from the needle stitches in the previous row.

  The rows formed by the edge forming thread are knitted with smaller needle stitches than

  the needle stitches in the other rows of the three-way fabric

  side. When the edge of the knitted fabric is formed, a subsequent row can be knitted using a water-soluble yarn. The water-soluble wire is partly dissolved by steam applied to it during this heat treatment, and parts of the water-soluble wire, which are not dissolved by the steam, and which remain on the needle stitches, serve as wedges

  retainer to prevent fraying.

  The last rows forming the edge of the knitted fabric are formed by means of the forming thread.

  edge consisting of a fusible wire and a thermo wire

  retractable, and the last rows are subjected to heat treatment at a temperature at which the fusible wire melts but the heat-shrinkable wire does not melt, which causes the meshes of the last row to shrink and adhere to each other. Consequently,

  the stitches in the last row cannot loosen

  ger from the previous row and the edge of the knitted fabric

therefore cannot unravel.

  The invention will now be explained further.

  in detail with reference to the accompanying drawings in the-

  which: FIG. 1 represents the structure of the knitted fabric, to which the method of the present invention is applied to avoid fraying; Figure 2 is a front elevation view

  of a fabric formed by successive sections of clothing-

  ment; Figure 3 is an enlarged view of the stitches of the garment section fabric of Figure 2, treated by an edge finishing process; and Figure 4 is an enlarged view of meshes

edge rows.

  A method according to the present invention, to prevent the edge of the knitted fabric from fraying, is

  applicable to the finishing of the junction between two fabrics

  sus whose constitution is different, such as that of stitches formed by the needles of the plateau and plain stitches and those of stitches formed by the needles of the plateau and plain stitches

  tubular, by intertwining these two tissues, and finally

  tion of the edges of the lost rows formed between the thumb and the body of a knitted glove, while also avoiding

  the fraying of the edges of the separate clothing sections

  rees of a fabric formed by lengths of clothing, which 2627s515s

will be described later.

  A method according to the present invention will main-

  holding be described as it is applied to a fabric formed by lengths of clothing and knitted in knitted fabric, as shown in Figure 2. A section of clothing 1 comprises a part

  hips 2, part of body 3 and part of shoulder

  the 4, knitted in this order. When knitting

  garment section 1, the number of stitches in a row

  gée is increased or decreased to form the section of

  garment 1 in a predetermined shape. When the

  shoulder tie 4 has been knitted, part lost 5 is

  formed before starting to knit the han-

  ches 2 of the next garment section 1. This knitting method is repeated to successively form a

  set of clothing sections 1.

  The junctions between the sets of clothing sections 1 are formed in the following manner, as shown in FIG. 1, The clothing section 1 is formed by means of one or more optional wires according to a type of

  optional mesh. In this example, the clothing sections

  ments 1 are formed in plain stitches. At least two edge rows 12 are formed by means of an edge forming wire 13 following the last row 11 of the garment section 1. The edge rows 12 which are formed by means of the edge forming wire edge 13

  are preferably knitted in the form of stitch

  guilles smaller than the needle stitches of the clothing sections 1. The edge forming wire 13 is a double wire consisting of a fusible wire 14 and a heat-shrinkable wire 15. The fusible wire 14 is for example the Elder ( registered trademark) of Toray which melts and becomes adhesive at 130 C. The heat-shrinkable wire 15 is for example Movilon (registered trademark) which does not melt

  but shrinks satisfactorily at 130 C.

  When the two edge rows 12 or more,

  have been formed, an appropriate number of rows of gar-

  weaving 16 (usually only one) is formed by means of a water-soluble wire 17, rows effectively

  lochables 18 forming a frayable part 5 are formed

  mées with an inexpensive wire, then the part of han-

  ches 2 of the next garment section 1 is formed.

  The water-soluble yarn 17 forming the lining rows 16 can be an alcohol filament yarn

  polyvinyl, for example Solblon (registered trademark).

  A certain type of Solblon dissolves in water or hot water, and melts and breaks when exposed to steam at 95 C or higher. When such a type of Solblon is used to form the water-soluble Vinylon yarn 17, the clothing sections 1 can be

  separated from each other by heat treatment.

  When the garment sections 1 have been so formed, heat is applied to the edge rows 12 to separate the garment sections 1 from each other and prevent the edges of the sections from fraying

  clothes 1. Steam can be used for applica

  quer the heat in the rows of edge 12 and reach the

  above purpose.When heated, the thermo wire

  retractable 15 which forms the edge rows 12

  retract and tighten needle stitches 20.

  As can be seen more clearly in FIG. 3, the needle stitch 20a of the first row 12a among

  the edge rows 12 tightly grip the form mesh

  driven by plate 21b of the next row (the second

  row 12b among the rows of edges 12) which is referred to it

  linked. The needle stitch 20b of the second row 12b is also enclosed by the retracted needle stitch

  of the first row 12a, which means that the stitch of ai-

  guille 20b cannot escape from the needle mesh 20a of the first row 12a. It is necessary to form at least two rows of edge, to maintain the stitches of needles

from the second row.

  Then, the rows, formed by means of the edge forming wire 13, are subjected to a heat treatment. It follows that the heat-shrinkable wire. 15 of the double wire is made to retract even more and the fusible wire 14 is made to melt, so that

  the parts of the fusible wire 14 adhere to the meshs of a-

  guilles and meshes formed by the plate to produce

  re mesh 19a, 19b, the edge of the garment section 1 thus being prevented from unraveling. In the event that

  edge rows are knitted by forming needle stitches

  guilles smaller than the needle stitches of the au-

  very tidy, we can more effectively avoid the fraying

chage of knitted fabric.

  The edge rows 16, formed by means of the water-soluble Vinylon 17 wire following the second

  row 12b rows of edge 12 are dissolved at the

  scared when steam is used for heat treatment

  or hot water when the heat treatment uses

  reads hot water, and the rows which follow and those which precede the edge rows 16, namely the rows formed by means of the edge forming thread 13 and the fraying rows 18, are thus separated from each other others, which means that the work which is required by the conventional method of protection against fraying

is remarkably reduced.

  In the method of avoiding fraying according to the present invention, the two edge rows 12 or more are formed by means of the edge forming wire 13 which is a double wire type consisting of a fusible wire 14 and a heat shrinkable wire 15 , and which are subjected to a heat treatment. As a result, the meshes

  needles 20b of the last row cannot get loose

  manage needle stitches 20a from the previous row due to the retraction of needle stitches 20

  edge rows 12 formed by means of thermo wire

  retractable 15, and as a result the meshes are effectively prevented from fraying.

Claims (5)

Claims   1. Method for preventing the fraying of the edge of a knitted fabric, comprising the operations consisting of: knitting at least two rows forming the edge of the knitted fabric by means of a double thread consisting of a fusible thread and a heat-shrinkable thread ; and heat treating the knitted fabric   at a temperature at which the fuse wire melts and the.   heat-shrinkable wire does not melt, which means that the needle stitches and the stitches formed by the plate   of the last row among the three-row set   tees by means of the double thread are held by and   due at the same time as the meshes of thermore-   towed and melted and the meshes formed by the plate from the previous row.   2. Method according to claim 1, characterized in that the rows to form the edge of the knitted fabric   are knitted by forming smaller needle stitches   that the needle stitches in the other rows of the knitted fabric.   3. Method according to claim 1 or 2, charac-   characterized in that the method further comprises the operations   tions consisting in: knitting a row with a water-soluble yarn after the rows knitted with the double thread; and treating the knitted fabric with steam or hot water to dissolve the water-soluble yarn so that part of the water-soluble yarn dissolved and remaining in the needle stitches serves as retaining wedges for   prevent needle stitches from coming off mail-   the needles in the previous row.   4. Method according to claim 3, character-   laughed in that said water-soluble yarn is a yarn   filamentary in polyvinyl alcohol. - 11   5. Method according to claim 4, charac-   terized in that the water-soluble yarn is a fila-   polyvinyl alcohol which melts in steam  C or more.