Classifications

• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
  • D04B21/02—Pile fabrics or articles having similar surface features
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2403/00—Details of fabric structure established in the fabric forming process
  • D10B2403/01—Surface features
  • D10B2403/011—Dissimilar front and back faces
  • D10B2403/0112—One smooth surface, e.g. laminated or coated
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2403/00—Details of fabric structure established in the fabric forming process
  • D10B2403/03—Shape features
  • D10B2403/031—Narrow fabric of constant width
  • D10B2403/0311—Small thickness fabric, e.g. ribbons, tapes or straps
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2501/00—Wearing apparel
  • D10B2501/06—Details of garments
  • D10B2501/063—Fasteners
  • D10B2501/0632—Fasteners of the touch-and-close type
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2505/00—Industrial
  • D10B2505/08—Upholstery, mattresses

Definitions

• the present invention relates to a knitted device, in particular a knitted mesh, with gripping loops, comprising a first zone, in particular a central zone, comprising loops intended to cooperate with associated hooks of a hook element and at least one second selvedge zone, in particular two second selvedge zones on either side of the first central loop zone, contiguous to the first loop zone and not comprising loops.
• the present invention also relates to a cover intended to cover a foam object produced by molding, for example a car seat, the cover comprising on its face intended to be in contact with the molded object a knitted loop device of the type mentioned above, the knitted loop device being fixed, in particular sewn, to the cover, in particular at the level of the at least one second selvedge zone.
• the present invention also relates to a molded object, for example a car seat, covered with a cover of this type.
• a foam is first molded into the shape of the seat to be obtained and during molding, hooks are overmolded so that they protrude from the bottom of cavities or trenches formed on the outer surface of the molded object to allow a cover to be fixed around the object by means of loops coming from the cover.
• loops are produced by means of a knitted loop device generally comprising a central zone, from which knitted loops protrude, and two selvedge zones, left and right, from which no knitted loops protrude and at the level of which the knitted loop device is fixed, in particular by sewing, to the cap to allow the latter to be fixed to the molded object by means of hooks overmolded to the molded object.
• This type of molded object covered with a cover, in particular a car seat, is known for example from the document FR 3 003 578 A1 , in which knitting is described.
• cover particularly in the form of a textile or leather sheet
• the cover must have an appearance that is as clean and precise as possible.
• the cover must perfectly match the contour of the molded object that it covers.
• the covers are either poorly fixed to the molded objects and in particular do not perfectly match the shape of the molded object, namely the car seat, that they are intended to cover, or, little by little over time, no longer perfectly match the shape of the seat.
• a knitted fabric comprising a first zone 1a, from which loops 4a formed by yarns R1 protrude, and a second contiguous zone 2a of the first zone, the second contiguous selvedge zone(s) not comprising loops, the knitted fabric comprising a base consisting of an interlacing of columns of stitches 3a (yarns R2) and threads R3 and R4 connecting in the weft direction and, in the first zone of the loop yarns knitted in the base, each loop consisting of two feet knitted in the base, two strands starting from the two feet and a top connecting the two strands, the weft yarns of the base extending in the MD direction with a back and forth movement in the CD direction so as to take in a zigzag pattern alternately a single row of columns of stitches, then a single other row of columns of stitches and so on along the MD direction.
• a knitted device in particular a knitted mesh, is as defined in claim 1
• a method of manufacturing the knitted device is as defined in claim 13, improvements and favorable embodiments being defined in the other claims.
• the knitted device may comprise a first zone, in particular rectangular, from which loops protrude and at least one second zone, in particular rectangular, contiguous, preferably two contiguous zones on either side of the first zone, the second contiguous selvedge zone(s) not comprising loops and being intended to allow the fixing of the knitted device with a cap intended to cover a molded object, in particular a car seat, for example by sewing, while the first loop zone is intended to cooperate with hooks projecting from the molded object, the knit comprising a base consisting of an interlacing of chain threads, or columns of stitches, and weft threads and, in the first zone of the loop threads knitted in the base, each loop consisting of two feet knitted in the base, two strands starting from the two feet and a top connecting the two strands, is characterized in that means are provided to prevent or combat the fraying of the threads of the knitted device forming the second selvedge zone(s).
• the means for preventing or combating fraying of the threads are arranged over the entire width of the second selvedge zone(s).
• a gripping loop is understood to mean a loop which projects from the plane formed by the bottom of the knitted fabric and/or a loop extending in a plane different from that of the bottom of the knitted fabric.
• the means for combating scuffing consist of covering the edge zone(s) with a coating, for example a resin or a glue, which, after hardening, gives the edges great dimensional stability and thus prevents them from scuffing.
• a coating for example a resin or a glue
• the knitted device is a knit comprising a base consisting of an interlacing of warp threads, or columns of stitches, and weft threads and, in the first central zone of the loop threads knitted into the base, each loop consisting of two feet knitted in the background, of two strands starting from the two feet and a connecting top of the two strands, the weft threads of the background extending in a back and forth movement in a transverse direction so as to zigzag in the machine direction around a number N of rows of columns of stitches between 2 and 5, in particular 3 rows, and this over the entire transverse extent of the background, with the exception of a number N - 1 of successive end rows of columns of stitches, in particular a number of N-1 last rows.
• the distance in CD between two consecutive weft threads is between 75% and 125% of the distance in CD between two consecutive warp threads.
• the weft threads of the background extending in a back and forth zigzag movement, two contiguous weft threads of the background are substantially parallel, more particularly the zigzag shape of the two contiguous weft threads of the background is such that a tip of the zigzag shape of a first weft thread and a tip of the zigzag shape of a second weft thread form a segment extending substantially parallel to the direction CD.
• the weft threads of the background extending in a back and forth zigzag movement, the distance in MD between two contiguous ends in MD of the same weft thread is between 0.5 mm and 5 mm, in particular between 0.8 mm and 3 mm, more particularly of the order of 1.8 mm.
• the weft threads of the background extending in a back and forth zigzag movement, the distance in CD between two contiguous ends in CD of the same weft thread is between 0.6 mm and 25 mm, in particular between 2 mm and 10 mm.
• the distance in CD between two contiguous ends in CD of the same weft thread can be between 0.6 mm and 10 mm, in particular between 2 mm and 4 mm, more particularly of the order of 3 mm.
• the distance in CD between two contiguous ends in CD of the same weft thread can be between 1 mm and 15 mm, in particular between 3 mm and 6 mm, more particularly of the order of 4.5 mm (i.e. 1/5 of an inch).
• the distance in CD between two contiguous ends in CD of the same weft thread can be between 1.33 mm and 20 mm, in particular between 4 mm and 8 mm, more particularly of the order of 6 mm.
• the distance in CD between two contiguous ends in CD of the same weft thread can be between 1.67 mm and 25 mm, in particular between 5 mm and 10 mm, more particularly of the order of 7.5 mm.
• the segment connecting the two feet of a loop extends in the MD direction and in the CD direction, thus forming an angle with respect to the MD direction preferably between 10° and 80°, in particular in certain cases between 30° and 75°.
• the inclination is alternated from one loop to the other in the CD direction, that is to say that the angle is alternating positive and negative.
• each loop consists of two feet knitted in the bottom and each foot belongs to different contiguous columns, the zigzag shape is obtained after N rows of columns of stitch or weft, without float, that is to say without skipping a row of stitch.
• fraying is also effectively combated at a lower cost, particularly by avoiding the use of less expensive coating material, such as resin or hardening glue, and by simplified manufacturing with fewer steps.
• the anti-fraying means are implemented so that, when the curve giving the force necessary to deform the knitted fabric in the transverse direction (CD) is plotted as a function of the deformation between the origin of coordinates (0, 0) and the breaking point R (recognizable by a sudden drop in the curve, for example a sudden variation in the force greater than 10%, in particular greater than 15%), the curve is always below the straight line connecting the origin and the point R.
• CD transverse direction
• the value of the force at 25% of the deformation is less than 150N, preferably less than 125N, even more preferably less than 100N, in particular less than 50N, or even 35N.
• the value of the force at 50% of the deformation is less than 350N, preferably less than 335N, even more preferably less than 300N, in particular less than 225N, or even 190N.
• the knit comprises a first central looped zone and two second contiguous selvedge zones, left and right.
• knitting is carried out on a three-bar loom, in particular a loom with three yarn distribution bars and a sinker bar.
• the knitting is carried out on a three-bar warp loom, in particular a loom with three yarn distribution bars, and a sinker bar.
• the knitting is carried out on a three-bar warp loom, one bar of which is a guide bar and two other bars being tube bars.
• the knitting is carried out on a warp loom, more particularly a crochet loom (for example a crochet loom marketed by the company COMEZ and/or Jakob Müller AG Frick under the reference Comez 610 ACO, more precisely Comez 610 ACO - 15).
• a crochet loom for example a crochet loom marketed by the company COMEZ and/or Jakob Müller AG Frick under the reference Comez 610 ACO, more precisely Comez 610 ACO - 15).
• the loop weave is a 10/12// closed mesh loop weave.
• the loop weave is an open loop weave, namely a 01/21// weave.
• the present invention also relates to a molded object, for example a car seat, comprising a block of molded material, in particular foam, having the shape of the object, in particular the car seat, and a cover covering the block, the fixing of the cover to the block being carried out by the cooperation between hooks, in particular a plurality of fields of hooks originating from the outer surface of the molded object, and knitted devices or looped knits according to the invention fixed, in particular sewn to the cover, in particular to the lower face of the cover.
• a molded object for example a car seat
• a block of molded material, in particular foam having the shape of the object, in particular the car seat
• a cover covering the block the fixing of the cover to the block being carried out by the cooperation between hooks, in particular a plurality of fields of hooks originating from the outer surface of the molded object, and knitted devices or looped knits according to the invention fixed, in particular sewn to the cover, in particular to the lower face of the cover.
• the materials of the weft, loop and warp yarns may be identical or different from each other, for example by choosing them from Polyethylene Terephthalate (PET), Polypropylene (PP), aramid, Polyamide (PA), Polyethylene (PE) or similar materials, as well as their mixtures. They may also be elastic or elastomeric and/or thermo-adhesive materials.
• the yarns may be flat, textured, covered and/or twisted.
• the weft, loop and warp yarns may be identical or of different natures, whether single-component, bi-component or more.
• a molded object in the form of a car seat comprising a block 1 made of foam, in particular polyurethane, having the shape of the car seat and which comprises a plurality of trenches 2 at the bottom of which has been fixed, in particular by prior insertion during molding, a strip 3 with hooks 14 to be rectangular overmolded.
• the molded object namely the car seat, is covered with a cover 4, which perfectly matches the outer surface of the block 1.
• the cover 4 is sewn to a knitted device 5, which comprises a central zone 6, from which knitted loops 9 protrude, and two selvedge zones 7 and 8, which are each sewn to the lower face of the cover 4.
• the cover 4 is fixed around the molded block 1, perfectly matching its shape.
• the molded object is thus obtained covered with its final cover, for example a car seat.
• THE figures 2 to 5 illustrate the weave of a boucle knit on a warp loom, which consists of working with three guide and tube bars.
• a first guide bar is used to form chains or columns of stitches, 10 in cooperation with each row (vertical in the figures) of needles.
• the second tube bar is used to form weft links 11 in cooperation with the chain-forming needles 10.
• a third tube bar is used to form on a sinker bar in the central part of the knit (rows 7 to 19) stitches 12 (the feet of the loops) on all the needles.
• the loop yarn thus forms the tops 13 of loops.
• the frame links ( figure 4 ) are represented by a non-meshed (weaved) system10. As for the chains, or columns of stitches, they can be open or alternated.
• each weft thread extends in a 00/33// weave.
• each weft thread extends in a zigzag in the machine direction (vertical in the figures) passing around three needles of three successive rows in the transverse direction (from left to right in the figure 4 ).
• all rows of needles are thus bypassed/blocked/taken in a zigzag by the weft threads, with the exception of the last two columns (24 and 25) which are bypassed/blocked/taken in a zigzag by the weft threads every other time, and over the entire background of the knitted fabric (rows 1 to 23).
• the number of weft threads is equal to the number of rows of stitch columns minus two.
• the weft threads are offset by one column.
• the number of weft threads is equal to the number of rows of stitch columns minus one.
• the number of weft threads is equal to the number of rows of stitch columns minus N plus 1.
• the zigzag extends in the MD direction and is formed on each row of stitches.
• the figures show 25 columns of needles. A different number of columns of needles can also be provided depending on the final width of the desired product.
• figure 2 the work of the bar of the columns of mesh is represented. This is a classic work, which is not described further here.
• the weft weave is represented. Each weft thread extends in a zigzag pattern around three needles, each zigzag weft thread extends directly after the previous weft thread. There are therefore as many weft threads as there are columns of stitches or columns of needles, fewer except for the last two, which are once out of two bypassed/blocked/caught in a zigzag pattern by the weft threads.
• the buckle armor shown in the Figure 5 is a 10/12// closed mesh loop weave.
• the loop weave is an open loop weave, namely a 01/21// weave.
• loop weave we make a so-called open/closed loop weave, namely a 10/01/21/12// weave.
• the invention is arranged so that all the weft threads extend in a zigzag pattern around three needles and by making sure that the weft threads extend in succession directly after each other, without being separated by a column of stitches or chains having no weft.
• the knitting is carried out with only three yarn bars.
• a fourth yarn distribution bar to produce a weft in the opposite direction, for example a weft identical to that of the figure 4 , or on the contrary a weave with fewer wefts, for example such that one chain out of two has no weft, or even two chains out of three or three chains out of four.
• the knitting is done with only three bars.
• zigzag around three needles
• 25 columns of needles are planned, and in particular 25 warp threads for a knitting width of 40 mm.
• the 5' looped knit has a central zone 6' and two selvedge zones 7' and 8'.
• the 5' knit consists of a ground made up of an interlacing of weft threads and column stitch threads and, in the central part, loop threads knitted to form loops.
• the ground may be as described above or, on the contrary, be different, namely, for example, weft threads which extend in a zigzag pattern across the entire width of the ground (as shown in figure 9 ) or on a number of rows greater than 5. It is also possible to provide weft threads which do not extend in succession over the entire width of the knitted fabric, for example by leaving every second or third row without weft thread.
• a resin allowing mechanical anchoring for example of the HMA (Hot Melt Adhesive) glue type with high viscosity, for example based on SBC (Styrene Block Copolymer in English or Styrene block copolymer), based on polyolefin (PO), based on Polyurethane (PU) and/or a chemical anchoring.
• HMA Hot Melt Adhesive
• SBC Polyolefin
• PU Polyurethane
• a thermal step could be carried out, for example hot calendering and/or ultrasonic welding in the selvedge areas to reinforce them and combat the fraying likely to appear due to this weft structure.
• the anti-friction means are constituted by the defined structure of the bottom frames.
• these anti-fraying means are constituted by the coating and in particular the layers of resins 15 and 16 in which the selvedges are taken.
• the curve is shown giving the force necessary to deform knits in the transverse direction (CD) according to the invention as a function of the deformation.
• This curve is conventionally obtained using a dynamometer, in particular by applying the method described in Standard NF EN1415, using the test of elongation at break in the CD direction, which consists of placing a sample of the knit between two jaws (inter-jaw distance equal to 20mm) of a dynamometer (traction speed of 100mm/min).
• the curve is always below the straight line connecting the origin and the point R.
• the value of the force at 25% of the deformation is less than 150N, preferably less than 125N, even more preferably less than 100N, in particular less than 50N, or even 35N.
• the value of the force at 50% of the deformation is less than 350N, preferably less than 335N, even more preferably less than 300N, in particular less than 225N, or even 190N.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Knitting Of Fabric (AREA)
• Slide Fasteners, Snap Fasteners, And Hook Fasteners (AREA)

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Citations (2)

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• 2019
  • 2019-04-08 FR FR1903735A patent/FR3094727B1/fr active Active
• 2020
  • 2020-03-31 US US17/601,598 patent/US11946176B2/en active Active
  • 2020-03-31 JP JP2021555888A patent/JP7440529B2/ja active Active
  • 2020-03-31 KR KR1020217031850A patent/KR102916957B1/ko active Active
  • 2020-03-31 ES ES20713909T patent/ES3055965T3/es active Active
  • 2020-03-31 CN CN202080027381.6A patent/CN113661281A/zh active Pending
  • 2020-03-31 WO PCT/EP2020/059071 patent/WO2020207856A1/fr not_active Ceased
  • 2020-03-31 KR KR1020257042684A patent/KR20260008171A/ko active Pending
  • 2020-03-31 EP EP25192910.5A patent/EP4636147A3/de active Pending
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