Classifications

• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
  • D04B1/10—Patterned fabrics or articles
  • D04B1/12—Patterned fabrics or articles characterised by thread material
  • D04B1/123—Patterned fabrics or articles characterised by thread material with laid-in unlooped yarn, e.g. fleece fabrics
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
  • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
  • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
  • D04B15/54—Thread guides
  • D04B15/56—Thread guides for flat-bed knitting machines
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B7/00—Flat-bed knitting machines with independently-movable needles
  • D04B7/14—Flat-bed knitting machines with independently-movable needles with provision for incorporating internal threads in laid-in fabrics
• • 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
  • D10B2403/02—Cross-sectional features
  • D10B2403/021—Lofty fabric with equidistantly spaced front and back plies, e.g. spacer fabrics
• • 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
  • D10B2403/02—Cross-sectional features
  • D10B2403/024—Fabric incorporating additional compounds
  • D10B2403/0241—Fabric incorporating additional compounds enhancing mechanical properties
  • D10B2403/02411—Fabric incorporating additional compounds enhancing mechanical properties with a single array of unbent yarn, e.g. unidirectional reinforcement fabrics
• • 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
  • D10B2403/02—Cross-sectional features
  • D10B2403/024—Fabric incorporating additional compounds
  • D10B2403/0241—Fabric incorporating additional compounds enhancing mechanical properties
  • D10B2403/02412—Fabric incorporating additional compounds enhancing mechanical properties including several arrays of unbent yarn, e.g. multiaxial fabrics
• • 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
  • D10B2505/02—Reinforcing materials; Prepregs

Definitions

• Multi-layer knitted fabric and process for its manufacture
• the invention relates to a multilayer or
• Multi-layer circular knitted fabric made of two RL knitted webs, which are connected to one another via a third thread system, and a method for its production, in particular for the production of semi-finished products for fiber composite materials.
• From DE-PS 458 906 is a multi-layer knitted fabric, consisting of two RL knitted fabric webs, which face each other with their left side of the goods and are connected by a third thread system.
• the third thread system consists of a set of standing threads which ensure the cohesion of the outer knitted fabric guaranteed
• the knitted fabric is intended to connect two different fabric surfaces.
• the third thread system is to better fill the knitted fabric and give strength in the longitudinal direction
• a reinforcing fabric for resin-containing laminates which consists of a knitted fabric or knitted fabric with reinforcing inserts.
• the reinforcing fabric consists of a large number of parallel chain inserts and a large number of parallel weft inserts in the knitted or knitted fabric.
• the chain insert is left Bow and the weft insert are limited by the right stitches.
• a disadvantage is that the structure is tied to a specific sequence
• REPLACEMENT BLA ⁇ (RULE 26) To produce knitted sheets. Spatial knitted structures can also be produced by connecting them in places. According to DE 40 08 057 AI, the knitted webs can be connected by a third knitted web. According to DE 36 43 357 AI, the connection is made by at least one knitted or knitted, comparatively thin, separate intermediate thread or knitted fabric. In this type of connection of two knitted fabric halves, the cohesion takes place through the formation of handles. The connecting thread itself forms loops or loops. The knitted fabrics therefore have no stretched thread layers and are only suitable to a limited extent as reinforcing knitted fabrics.
• the invention has for its object to manufacture em multi-layer knitted fabric of the type mentioned, which can be both thin and thick-walled sem, has high drapability and has the ability to absorb tensile, compressive and bending forces.
• Layers of warp and weft threads are integrated into the RL knitted fabrics that delimit the outside.
• the cohesion of the warp and weft layers is guaranteed by the left-hand bends that run through the layers and loop around all existing warp threads.
• the end of the multi-layer knitted fabric is formed by warp threads wrapped in left-hand bows alone or together with weft threads knitted with right-hand stitches, depending on the structure of the warp and weft layers.
• the density of the warp and / or weft threads does not necessarily have to be evenly distributed over the width and length of the knitted fabric, but can be used, for example, to accommodate parts such as e.g. Screws, be zero locally.
• the forces in the fiber composite material are absorbed by the stretched layers of warp and weft threads.
• the cohesion of the layers via the two stitch thread systems ensures a high drapability of the knitted fabric and good delamination behavior if the stitch thread is made of high-performance material.
• Production of fiber composite materials is suitable for the production of other textile fabrics, such as
• a stitch thread is presented from two sides, for example from two needle beds, to at least one warp thread family.
• the stitch thread is pulled through in loops by means of needles and on the other side is stitched with the previous stitch thread of the same stitch thread system.
• REPLACEMENT BLA ⁇ (RULE 26) Side (opposite the side of the first stitch thread) presented a second stitch thread transversely and processed in the same way as the first stitch thread.
• a plurality of warp thread sheets are fed between the two knitted fabric sheets.
• a limit is due to the constructive shape, e.g. the needle size.
• individual weft threads can be placed between or on the side of the warp thread coulters between the knitting courses.
• Warp and weft threads can be guided almost unlimitedly in any direction and change to other levels.
• the direction is essentially determined by the force curve in the fiber composite material or by locations with special reinforcement.
• the advantage of the invention is that a large number of warp and weft threads are connected by two stitch threads. This ensures a high drapability of the knitted fabric with securing the bond between the layers.
• the knitted fabric is therefore particularly suitable for the production of fiber composite materials.
• Fig. 1 is a representation to illustrate the method with warp and two needles
• Fig. 2 shows a cross section through a multi-layer knitted fabric with 2 layers of warp threads and 3 layers of weft threads
• FIG. 3 is a plan view of a multi-layer knitted fabric with an extended warp thread layer
• Fig. 4 with a top view of a multi-layer knitted fabric
• FIG. 5 shows a top view according to FIG. 4 with an additional layer of stretched weft threads and different weft thread densities
• Fig. 6 is a plan view of FIG. 4 with weft threads passed around the release
• Fig. 7 is an illustration to illustrate the method with 2 warp threads and 3 weft threads
• Fig. 8 is a representation with a variable design of the weft layers
• Fig. 1 the method with warp thread and two needles is shown with its two sub-cycles offset in time.
• the needles 1 a of the front needle bed 2 a in the second partial cycle, the needles 1 b of the rear needle bed 2 b are moved in their longitudinal direction by knitting lock mechanisms (not shown here).
• the needle heads of each needle la, lb penetrate the warp thread sheet 4 m height of the warp thread guide tubes 3 alternately completely during the upward movement of the needle la, lb, the half stitch 5a, 6a reaches the needle shaft and thereby opens the needle tongue.
• the knitting thread 5 of the one stitch thread system m becomes the opened needle head of the needle 1 a and thus behind the warp thread family 4
• REPLACEMENT BLA ⁇ (RULE 26) placed .
• the knitting thread 6, not shown here, of the other mesh thread system m is placed over the opened needle head of the needle 1a and thus in front of the warp thread family 4.
• the stitch thread 5, 6 m is drawn in the form of loops between the warp threads of the warp thread family 4, the half stitch 5a, 6a closing the needle tongue, sliding over it and over the closed needle head on the other side of the Warp thread sheet 4 is knocked off.
• FIG. 2 shows the cross section through a multi-layer knitted fabric which can be produced by the method according to the invention.
• the individual layers are formed from weft threads 7a, 7b, 7c and warp threads 4a, 4b, their arrangement and order being freely selectable.
• the connection of both stitch thread systems is carried out by two warp thread sets in that the left-hand stitch bow 5a of the emen
• Knitting thread system 5 in front of the front warp thread sheet 4a and the left-hand stitch bows 6a of the other stitch thread system 6 are arranged behind the rear warp thread sheet 4b smd.
• Fig. 3 shows a plan view of a multi-layer knitted fabric with an extended warp thread layer. Only the upper warp thread group is visible in the figure. Additional groups can be arranged behind it. From the figure it can be seen how the warp threads are encompassed by the left-hand arches of the stitch thread.
• REPLACEMENT BLA ⁇ (RULE 26) Warp threads that are suitable for holding parts such as screws. The cohesion at this point is ensured by the two mesh threads. Complete breakthroughs can be created by reassigning the half stitches.
• the knitted fabric is reinforced by an additional layer of weft threads.
• the weft threads are held by the warp threads and the right mesh of a knitted fabric.
• the spacing of the weft threads can be varied.
• the weft is guided around the release in FIG. 4.
• the weft thread is continued in the original laying direction, the other in the opposite direction.
• the weft threads thus create a reinforcement around the release.
• Such a solution is appropriate when this point is exposed to particularly high loads.
• 7 is a further illustration to illustrate the method. It is shown how the connection of the two knitted fabrics and the warp and weft layers takes place when 2 warp thread sheets and 3 layers of weft threads are fed.
• Fig. 8 shows possible courses of the weft layers, which are generated by changing between the planes determined by the warp yarn sheets.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Knitting Of Fabric (AREA)
• Medicines Containing Material From Animals Or Micro-Organisms (AREA)

Applications Claiming Priority (1)

Publications (2)

Family

ID=6918225

Family Applications (1)

Country Status (7)

Families Citing this family (22)

Family Cites Families (14)

• 1994
  • 1994-06-08 DE DE4419985A patent/DE4419985C2/de not_active Expired - Fee Related
• 1995
  • 1995-12-12 DE DE59510165T patent/DE59510165D1/de not_active Expired - Fee Related
  • 1995-12-12 AT AT95940166T patent/ATE216003T1/de not_active IP Right Cessation
  • 1995-12-12 WO PCT/DE1995/001774 patent/WO1997021860A1/fr active IP Right Grant
  • 1995-12-12 US US09/077,135 patent/US6244077B1/en not_active Expired - Fee Related
  • 1995-12-12 JP JP09521586A patent/JP2000501792A/ja not_active Ceased
  • 1995-12-12 EP EP95940166A patent/EP0873440B1/fr not_active Expired - Lifetime
  • 1995-12-12 AU AU41717/96A patent/AU4171796A/en not_active Abandoned

Non-Patent Citations (1)

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