EP1820891B1 - Procédé pour la production d'une barre en matériau synthétique pour des éléments de tricotage et la barre en matériau synthétique pour des éléments de tricotage - Google Patents

Procédé pour la production d'une barre en matériau synthétique pour des éléments de tricotage et la barre en matériau synthétique pour des éléments de tricotage Download PDF

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Publication number
EP1820891B1
EP1820891B1 EP20060024253 EP06024253A EP1820891B1 EP 1820891 B1 EP1820891 B1 EP 1820891B1 EP 20060024253 EP20060024253 EP 20060024253 EP 06024253 A EP06024253 A EP 06024253A EP 1820891 B1 EP1820891 B1 EP 1820891B1
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EP
European Patent Office
Prior art keywords
plastic
hose
bar
wall
finished product
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20060024253
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German (de)
English (en)
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EP1820891A1 (fr
Inventor
Kresimir Mista
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Karl Mayer Textilmaschinenfabrik GmbH
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Karl Mayer Textilmaschinenfabrik GmbH
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Publication of EP1820891A1 publication Critical patent/EP1820891A1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B27/00—Details of, or auxiliary devices incorporated in, warp knitting machines, restricted to machines of this kind
    • D04B27/06—Needle bars; Sinker bars

Definitions

  • the invention relates to a method for producing a plastic Wirktechnikmaschinebarre having a first portion in which a wall surrounds an interior, and a second portion, are arranged in the edge portions of the wall above the other, in which a flat plastic semi-finished in insert a press mold and pressurized to press the second section. Furthermore, the invention relates to a plastic Wirktechnikmaschinebarre with a first portion in which a wall surrounds an interior, and a second portion in which the wall continues with two edge portions and in which the edge portions are arranged one above the other.
  • Knitting machines usually have several bars that carry knitting tools.
  • elements of action are all elements that are combined on the Knitting process are involved, such as knitting needles, hole needles, milling plates, Polplatinen, tee boards, etc.
  • a bar carries guide needles, then it must be swung once and once to form a loop in a knitting cycle in the direction of the longitudinal extent of the knitting machine. Under certain circumstances, a pivoting is added transversely to the L Lucasserstrekkung the knitting machine. Other bars are only moved transversely to the longitudinal extent of the knitting machine or in other directions. In all cases, you must accelerate the bar from standstill and decelerate to reach the final position of the bar in a cycle again. The larger the mass of the barre, the larger the forces required to accelerate and decelerate the bar.
  • Knitting machines can have widths that extend over several meters, for example, over 6 m. In order to be able to work satisfactorily, the bar needs a certain mechanical stability. This also applies to shorter lengths. In particular, the bar should have some rigidity and not swing. On the other hand, you want to keep the mass of the bar as low as possible in order to operate the knitting machine at high speeds.
  • DE 41 11 108 C2 proposed to form a bar of a reinforced plastic by forming the hollow profile of flat overlapping superimposed bands of plastic.
  • a shaped body is arranged, which remains permanently in the cavity and contains nut thread pieces for the attachment of components.
  • the shaped body is required so that you have an abutment during manufacture of the bar, against which the fiber-reinforced plastic bands can be placed.
  • the molded body is used for fastening nut thread pieces, which later components can be attached.
  • the DE 203 14 470 U1 shows a similar design of the Wirkwerkmaschinemaschinen.
  • the invention has for its object to make the production of a plastic Wirktechnikmaschinebarre simple and flexible.
  • This object is achieved in a method of the type mentioned in that one acts on the interior during pressing by means of a pressurized fluid with internal pressure.
  • the internal pressure which can be generated by a pressurized fluid, for example compressed air or a liquid, takes over the task of the hollow body, i. the internal pressure presses the plastic, which forms the wall surrounding the interior, from the inside to the outside against the press mold.
  • a pressurized fluid for example compressed air or a liquid
  • a prepreg Preferably used as a plastic semi-finished product is a prepreg, in particular a UD prepreg.
  • a prepreg is a plastic semi-finished product in a flat form, in which reinforcing fibers are embedded in a plastic matrix.
  • a UD prepreg UD stands for unidirectional
  • the fibers all have the same preferred direction.
  • Such a prepreg is cured in the press mold under pressure and optionally also at elevated temperature and / or with heat release. This gives a bar with a relatively high strength.
  • the hose is only put under pressure when the mold is closed. Before that, it can be easily filled, if appropriate.
  • the hose has two tasks. First, he holds when inserting the plastic, the inner walls, ie, the inside of the wall surrounding the cavity away from each other, so that the inner walls do not stick together.
  • the tube is pressurized to press the plastic semi-finished product from the inside outwards against the press mold. Only the hose must therefore be able to hold the pressure building fluid.
  • This fluid may be a gas, for example air, or a liquid, for example water.
  • the bar itself does not have to be gas or liquid tight. Also, one need not worry that the plastic material is compatible with the fluid. In addition, it is easier to create a pressure chamber with the help of the hose than simply to produce such a pressure chamber only in the press mold.
  • the tube is left in the interior and receives a knitting tool bar according to claim 11.
  • the hose will stick to the plastic during pressing. It is much easier to leave the hose in the interior than to remove it. An appreciable increase in mass is not associated with leaving the hose in the interior.
  • a hose made of a temperature-resistant plastic, in particular polyethylene terephthalate.
  • the curing of the plastic semifinished product usually takes place at an elevated temperature. It is therefore advantageous if the tube can withstand this temperature so that the desired pressure can be maintained throughout the curing process inside the tube.
  • a hose is used with a wall thickness of not more than 0.5 mm, in particular not more than 0.05 mm.
  • a preferred embodiment of the method uses a hose whose wall thickness is 0.025 mm.
  • Such hoses are commercially available, for example for the production of sausages in a meat processing plant.
  • the hose does not even have to be stretchable. It is easy to use a tube whose cross-section in the fully inflated state is greater than the cross-section of the interior. If the hose strikes when inflating, this is not critical. All that is necessary is that you can apply a predetermined pressure with the help of the hose.
  • auxiliary element is inserted, which is arranged between a press cavity and a vent channel.
  • the auxiliary element has two advantages. On the one hand, it allows venting, in particular in the case of sharp corners or edges of the mold, because the auxiliary element can never rest in a completely gastight manner on other components of the mold. On the other hand, you can make certain minor changes with the help of the auxiliary element also on the Au- ⁇ enkontur. For this it is only necessary to replace the auxiliary element. The press mold can otherwise remain unchanged.
  • a plurality of layers of the plastic semifinished product are arranged one above the other.
  • certain areas of the wall can be selectively strengthened, if desired or required.
  • a reinforcement can be useful, for example, if fastening elements are to be arranged in this partial area of the wall.
  • At least one further layer of semi-finished plastic material is used in the second section.
  • the second section is often used to hold knitting elements, such as guide needles or the like. Again, then a reinforcement may be useful.
  • the object is achieved in a plastic Wirktechnikmaschinebarre of the type mentioned fact that on the inside of the wall, a hose is arranged.
  • the tube can be used in the production of the bar to build a pressure in the interior, which presses the plastic semi-finished product from the inside out against the press mold.
  • the tube sticks to the plastic semifinished product when the plastic semifinished product cures.
  • the tube then remains in the bar. But he does not wear anything worth mentioning to a mass increase, so that he does not bother.
  • the tube is formed of a temperature-resistant plastic, in particular polyethylene terephthalate.
  • the tube thus keeps out the temperatures that arise during curing of the plastic semifinished product.
  • the pressure generated in the interior of the tube during manufacture of the bar can be maintained until a time at which the plastic has cured.
  • the tube has a wall thickness of not more than 0.5 mm, in particular not more than 0.05 mm. In a preferred embodiment, the tube has a wall thickness of 0.025 mm.
  • the hose itself does not have to have greater mechanical strength. He puts himself in creating the pressure from the inside of the plastic semi-finished, which in turn is supported on the press mold. Accordingly, even with very thin wall thicknesses there is virtually no danger that the hose will be damaged by the generation of pressure.
  • a plurality of layers of a plastic semifinished product are arranged one above the other. You can selectively reinforce the wall in these areas to accommodate, for example, fasteners there.
  • At least one further layer of the plastic semifinished product is arranged in the second section. Leave it strengthen the second section so that it can be used for the attachment of active elements.
  • Fig. 1 shows a first half 1 of a press mold 2 ( Fig. 3 ) for producing a Barre 3 ( Fig. 4 ).
  • the first half 1 has a press cavity 4, in which an auxiliary element 5 is arranged.
  • the auxiliary element 5 forms with the first half 1 of the press mold a gap 6, which leads from the press cavity 4 to a vent channel 7.
  • the press mold 2 also has a second half 8, which also has a press cavity 9.
  • the individual layers are expediently oriented in different directions, so that, for example, adjacent layers at an angle of 90 ° (other angles are possible) include. It comes an edge portion 11 of the plastic semifinished product 10 to lie on the auxiliary element 5.
  • the plastic semifinished product 10 then lines the press cavity 4, in the present case, V-shaped.
  • a tube 12 is inserted, which for reasons of clarity in Fig. 1 already shown with a certain filling. In fact, the hose does not yet have to be inflated. Then it will, like this Fig.
  • the clear distance between the two press halves 1, 8 is slightly smaller than twice the thickness of the plastic semifinished product 10 in the non-compressed state, so that by closing the press mold 2, a pressure on the two Can exert edge portions 11, 13.
  • the two edge portions 11, 13 of the plastic semifinished product are pressed together in this way. They form a second section b of the barre ( Fig. 4 ). At this second section knitting tools can be attached later.
  • the tube 12 is pressurized by a pressurized fluid under pressure, such as compressed air, water or oil, fed into the tube 12 and then presses the remaining area of the plastic semifinished product 10 against the press mold 2 from the inside, so that a first section a is formed, in which a wall 17 surrounds an interior 18 ( Fig. 4 ).
  • a shaped body which serves as an abutment, is not required here.
  • the tube 12 is formed of a plastic that can withstand the temperatures occurring during curing of the plastic semifinished product 10 without being damaged.
  • a suitable material for this is, for example, polyethylene terephthalate.
  • the hose itself does not require greater mechanical stability. Accordingly, a wall thickness of, for example, 0.025 mm is sufficient.
  • Fig. 5 to 7 show a modified embodiment in which the same parts are provided with the same reference numerals.
  • the auxiliary element 5 has been omitted here in the first half of the press mold 1. While in the embodiment of the Fig. 1 to 4 Inserting a single plastic semi-finished product 10 in the press mold 2, one uses in the embodiment of the Fig. 5 to 7 two separate plastic semi-finished products 10a, 10b, which are inserted with formation of an overlap zone 10c in the first half 1 of the press mold 2. Then, if you put the tube 12 under pressure, then there is a reinforced zone 17a of the wall 17, where you can attach, for example, holding elements for the bar.
  • Fig. 8 shows a modified form of the bar 3 with a fastener 19 in a reinforced portion 17 a. Furthermore, the second area b of the bar 3 is reinforced in order to be able to better attach knitting needles to it, for example.
  • Fig. 9 shows how to prepare plastic semi-finished products for insertion into the press mold 2 and the individual plastic semi-finished products 20a, 20b, 20c, 20d in the press mold 2 inserts.
  • the plastic semi-finished products 20a-20d are then pressed in the first area a by means of the pressurization of the hose 12 against the inner wall of the press mold 2.
  • the plastic semi-finished products 20a-20c are pressed together by squeezing the two halves 1, 8 together.
  • the plastic semi-finished product 20a is placed in the form of an ⁇ -shaped loop around the tube 12, so that its edge portions 11, 13 are superimposed. These two edge portions 11, 13 are separated from each other by the two other plastic semi-finished products 20b, 20c. This results in four layers, which through the Pressurization of the two halves 1, 8 of the press mold 2 are pressed together.
  • the plastic semi-finished product 20d is arranged, which is pressed with the lower wall 17b of the wall 17 by the pressurization of the tube 12.
  • Fig. 10 shows a schematic representation of how a plurality of UD prepregs 21a-21e are arranged one above the other. Shown are only the fibers of the prepregs 21a-21e. A plastic matrix present in the prepregs is not apparent here. Such a stack of prepregs provides excellent stability in virtually all directions when used as a plastic semi-finished product.
  • anyone in Fig. 10 "Wires" actually consists of many hundreds or many thousands of individual fibers.
  • the thickness of the bar By choosing several or less superimposed prepreg layers, the thickness of the bar, more precisely, the thickness of the wall thickness change. This makes it easy to create reinforced areas.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulding By Coating Moulds (AREA)

Claims (16)

  1. Procédé de fabrication d'une barre en matière plastique pour outil de tricotage, laquelle comporte une première section (a), dans laquelle une paroi (17) entoure un espace intérieur (18), et une deuxième section (b), dans laquelle des tronçons de bordure (11, 13) de la paroi (17) sont superposés, dans lequel procédé un demi-produit (10 ; 10a, 10b ; 20a-20d) plat en matière plastique est mis en place dans un moule de compression et est sollicité par une pression en vue de la compression de la deuxième section (b), caractérisé en ce que, pendant la compression, l'espace intérieur (18) est sollicité par une pression intérieure au moyen d'un fluide sous pression.
  2. Procédé selon la revendication 1, caractérisé en ce que le demi-produit en matière plastique utilisé est un préimprégné (21a-21e), en particulier un préimprégné unidirectionnel.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'un tuyau (12) est mis en place avec le demi-produit (10 ; 10a, 10b ; 20a-20d) en matière plastique dans le moule de compression (2) et le demi-produit (10 ; 10a, 10b ; 20a) en matière plastique est guidé tout autour du tuyau (12), ledit tuyau (12) étant mis sous pression.
  4. Procédé selon la revendication 3, caractérisé en ce que le tuyau (12) est laissé en place dans l'espace intérieur (18).
  5. Procédé selon la revendication 3 ou 4, caractérisé en ce que l'on utilise un tuyau (12) en matière plastique résistant à chaud, en particulier en polyéthylènetéréphtalate.
  6. Procédé selon l'une quelconque des revendications 3 à 5, caractérisé en ce que l'on utilise un tuyau (12) avec une épaisseur de paroi de 0,5 mm maximum, en particulier de 0,05 mm maximum.
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'on utilise un moule de compression (2), dans lequel est mis en place un élément auxiliaire (5), qui est disposé entre une cavité (4) du moule et un conduit d'évacuation d'air (7).
  8. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce que l'on dispose plusieurs couches (10a, 10b ; 20a, 20d) du demi-produit en matière plastique les unes au-dessus des autres au moins dans une zone partielle (17a) de la paroi (17).
  9. Procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce que dans la deuxième section (b), en plus des tronçons de bordure (11, 13), on dispose au moins une couche (20b, 20c) supplémentaire du demi-produit en matière plastique.
  10. Procédé selon l'une quelconque des revendications 1 à 9, caractérisé en ce que dans la deuxième section (b) sont utilisés des demi-produits en matière plastique avec des directions préférentielles différentes.
  11. Barre en matière plastique pour outil de tricotage, comportant une première section (a), dans laquelle une paroi (17) entoure un espace intérieur (18), et une deuxième section (b), dans laquelle la paroi (17) se prolonge par deux tronçons de bordure (11, 13) et dans laquelle les tronçons de bordure (11, 13) sont superposés, caractérisée en ce qu'un tuyau (12) est agencé contre la face intérieure de la paroi (17).
  12. Barre selon la revendication 11, caractérisée en ce que le tuyau (12) est réalisé en matière plastique résistant à chaud, en particulier en polyéthylènetéréphtalate.
  13. Barre selon la revendication 11 ou 12, caractérisée en ce que le tuyau flexible (12) a une épaisseur de paroi de 0,5 mm maximum, en particulier de 0,05 mm maximum.
  14. Barre selon l'une quelconque des revendications 11 à 13, caractérisée en ce que plusieurs couches d'un demi-produit en matière plastique sont disposées les unes au-dessus des autres au moins dans une zone partielle (17a) de la paroi (17).
  15. Barre selon l'une quelconque des revendications 11 à 14, caractérisée en ce qu'au moins une couche (20b, 20c) supplémentaire du demi-produit en matière plastique est disposée dans la deuxième section (b), en plus des tronçons de bordure (11, 13).
  16. Barre selon la revendication 14 ou 15, caractérisée en ce qu'en présence de plusieurs couches superposées du demi-produit en matière plastique, au moins deux couches ont des directions préférentielles différentes.
EP20060024253 2006-02-08 2006-11-23 Procédé pour la production d'une barre en matériau synthétique pour des éléments de tricotage et la barre en matériau synthétique pour des éléments de tricotage Active EP1820891B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610005703 DE102006005703A1 (de) 2006-02-08 2006-02-08 Verfahren zum Herstellen einer Kunststoff-Wirkwerkzeugbarre und Kunststoff-Wirkwerkzeugbarre

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EP1820891A1 EP1820891A1 (fr) 2007-08-22
EP1820891B1 true EP1820891B1 (fr) 2010-07-21

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EP (1) EP1820891B1 (fr)
CN (1) CN101015954B (fr)
DE (2) DE102006005703A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2770096A1 (fr) 2013-02-22 2014-08-27 Karl Mayer Textilmaschinenfabrik GmbH Barre en matériau synthétique pour des éléments de tricotage

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2230343B1 (fr) * 2009-03-19 2011-09-28 Karl Mayer Textilmaschinenfabrik GmbH Barre pour éléments de tricotage à mailles jetées
DE102010044673B4 (de) 2010-09-08 2014-01-09 Karl Mayer Textilmaschinenfabrik Gmbh Wirkwerkzeugbarren-Reparaturset und Wirkwerkzeugbarre
DE102010045049B4 (de) * 2010-09-10 2012-10-04 Karl Mayer Textilmaschinenfabrik Gmbh Verfahren zum Herstellen einer Wirkwerkzeugbarre
CN105034356A (zh) * 2015-03-12 2015-11-11 苏州复威新材料有限公司 大厚度柔软块状eva材料的生产工艺
CN110344172B (zh) * 2019-08-06 2023-09-08 宁波丽成复合材料制品有限公司 一种高速精编机纺针碳纤维底座

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19803965B4 (de) * 1998-02-02 2010-07-22 Vereinigung zur Förderung des Instituts für Kunststoffverarbeitung in Industrie und Handwerk an der Rhein.-Westf. Technischen Hochschule Aachen eV Verfahren zur Herstellung von Hohlkörpern aus thermoplastischen Kunststoffen mit Lang- und/oder Endlosfaserverstärkung
DE20314470U1 (de) * 2003-09-18 2003-11-20 Mayer Malimo Textilmaschf Barre aus faserverstärktem Kunststoff-Hohlprofil
DE102004023802B3 (de) * 2004-05-13 2005-12-22 Liba-Maschinenfabrik Gmbh Kettenwirkmaschine mit Bauelementen aus Kunststoffmaterial
DE502004006772D1 (de) * 2004-05-27 2008-05-21 Mayer Textilmaschf Wirkwerkzeug-Barre

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2770096A1 (fr) 2013-02-22 2014-08-27 Karl Mayer Textilmaschinenfabrik GmbH Barre en matériau synthétique pour des éléments de tricotage

Also Published As

Publication number Publication date
CN101015954B (zh) 2010-10-20
CN101015954A (zh) 2007-08-15
EP1820891A1 (fr) 2007-08-22
DE102006005703A1 (de) 2007-08-16
DE502006007474D1 (de) 2010-09-02

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