EP1037751A1 - Rouleaux en matiere plastique pouvant effectuer une rotation - Google Patents

Rouleaux en matiere plastique pouvant effectuer une rotation

Info

Publication number
EP1037751A1
EP1037751A1 EP98962429A EP98962429A EP1037751A1 EP 1037751 A1 EP1037751 A1 EP 1037751A1 EP 98962429 A EP98962429 A EP 98962429A EP 98962429 A EP98962429 A EP 98962429A EP 1037751 A1 EP1037751 A1 EP 1037751A1
Authority
EP
European Patent Office
Prior art keywords
layer
roller
roller layer
plastic
roller shaft
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.)
Withdrawn
Application number
EP98962429A
Other languages
German (de)
English (en)
Inventor
Frank Reil
Hermann Kleinegesse
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.)
Ticona GmbH
Original Assignee
Ticona GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ticona GmbH filed Critical Ticona GmbH
Publication of EP1037751A1 publication Critical patent/EP1037751A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B33/00—Castors in general; Anti-clogging castors
    • B60B33/0036—Castors in general; Anti-clogging castors characterised by type of wheels
    • B60B33/0044—Roller type wheels, i.e. extra wide wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1671—Making multilayered or multicoloured articles with an insert
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B33/00—Castors in general; Anti-clogging castors
    • B60B33/0028—Construction of wheels; methods of assembling on axle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C2045/1601—Making multilayered or multicoloured articles the injected materials not being adhered or bonded to each other
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49544—Roller making

Definitions

  • the invention relates to a method for producing rotatable plastic rollers from an axle, an outer roller layer and an inner roller layer.
  • Plastic rollers of any kind in particular those with a metal shaft as an axis, are usually produced by mounting a separately manufactured plastic roller on an axis. So that the plastic roller does not slip off the axle after assembly, it must either have an undercut, for example an annular bead that engages in an annular recess on the axle, or be secured by laterally attached disks.
  • a major disadvantage of this method is that the assembly of the plastic roller is time-consuming and often also time-consuming.
  • the undercuts must be made so that the assembly of the plastic roller on the axis can still be accomplished. This usually results in too much play between the plastic roller and the axle, which can cause inaccurate running, running noises or excessive wear. If the plastic roller is secured by side washers, further assembly work is required and additional material costs are incurred.
  • DE 93 19 307 U1 describes wheels for rollers which consist of a rim body and a hard outer shell as tires, each made of thermoplastic polymer, and a soft, sound-absorbing intermediate layer.
  • the intermediate layer is optionally formed by an injected elastomer, which is firmly connected to it by contact fusing in the surface areas of the rim body and the tires, or by a polyurethane injection molded part that is mechanically, for example, by Undercuts or tread grooves, is firmly connected to the rim body and the tires.
  • this often undesirable property is exploited by filling the cavity between the roller shaft and the outer roller layer with the melt of a thermoplastic during the manufacture of a plastic roller.
  • the thermoplastic material shrinks due to the volume contraction on the roller shaft and is thus firmly connected to it.
  • the plastic shrinks away from the outer roller layer, creating a sliding gap and making the outer roller layer rotatable around the inner roller layer.
  • the method according to the invention can be carried out in a very simple manner such that the roller shaft and the outer roller layer are placed in an injection molding tool, hereinafter referred to as tool, and the thermoplastic is injected into the remaining cavity between the roller shaft and the outer roller layer.
  • the method according to the invention is preferably carried out in the multi-component injection molding process, in that only the roller shaft is placed in the mold and both the outer and the inner roller layer are produced by injection molding in the mold.
  • a tool core also called a slide
  • a slide is inserted into the tool around the roller shaft, so that a cavity remains in the form of the outer roller layer to be produced, into which a plastic is then injected.
  • the slide is removed, i.e. opened, and a thermoplastic material is injected into the resulting cavity around the roller shaft. As described, this then shrinks when cooling onto the roller shaft and away from the outer roller layer.
  • thermoplastic elastomer In order to dampen the running noise, particularly in the case of plastic rollers with a metal roller shaft, it is appropriate to encase the roller shaft with a thermoplastic elastomer. On the one hand, this can be done by fitting an appropriate casing on the roller shaft before it is overmolded in the tool. On the other hand, it is also possible to choose the dimensions of the slide so that a cavity remains between the slide, which in principle has the shape of a cylinder jacket, and the roller shaft, into which the thermoplastic elastomer can be injected. When it cools down, it then shrinks onto the roller shaft, thus ensuring a firm hold. After opening the slide, the thermoplastic material is then injected into the remaining cavity between the outer roller layer and the casing made of the thermoplastic elastomer. The thermoplastic then shrinks onto the layer of thermoplastic elastomer.
  • the thermoplastic and the thermoplastic elastomer are preferably so chosen that these two plastics form a chemical or physical bond with each other at their interface
  • the multi-component injection molding process according to the invention can be used to produce rotatable plastic rolls which are constructed from any number of layers. However, there must be at least two layers, the outer roller layer and the inner roller layer. When manufacturing plastic rollers using the method according to the invention, care must also be taken to ensure that there is good adhesion between the roller shaft and the inner roller layer and that the materials from which the outer and inner roller layers are made do not form a bond with one another.
  • the roller shaft and the outer roller layer can generally consist of a plastic material, for example of a thermoset or a reinforced or partially crystalline thermoplastic, or of a metallic material.
  • the roller shaft is preferably made of steel; for the outer roller layer, especially slide-modified plastics, for example slide-modified polyacetals, polyesters or polyamides, are suitable.
  • slide-modified plastics are understood to mean those plastics that contain lubricants, i.e. Includes additives to improve the sliding and dry running properties. Suitable additives are generally known for all plastics.
  • thermoplastic materials for example polyacetals, for example polyoxymethylene (POM), polyesters, for example polyethylene terephthalate (PET) or polybutylene terephthalate (PBT), polyamides (PA), in particular PA 6, PA 46 or, are as thermoplastic plastic for the production of the inner roller layer PA 66, polycarbonate (PC), polyvinyl chloride (PVC) or polyolefins, e.g. polyethylene (PE) or polypropylene (PP).
  • PC polycarbonate
  • PVC polyvinyl chloride
  • PE polyethylene
  • PP polypropylene
  • these plastics should have a volume contraction of 0.1 to 5%, preferably 0.3 to 3.5% and particularly preferably 0.5 to 2.5%. They can also contain additives common to thermoplastics as well as fillers and reinforcing materials.
  • the thermoplastic is, for example, by adding fillers or reinforcing materials or by To optimize the selection of a comonomer or a blend partner in such a way that the sliding gap resulting from the shrinkage is neither too large nor too narrow.
  • TPE Thermoplastic elastomers
  • TPE-O polyolefin elastomers
  • TPE-E polyether ester elastomers
  • TPE-U Thermoplastic elastomers
  • TPE-O include, for example, blends or copolymers made of polypropylene and ethylene-propylene copolymers
  • TPE-S include, among others.
  • the thermoplastic elastomers can also contain conventional additives. Instead of the TPE, the use of rubbers is in principle also suitable, provided that these can be processed in accordance with the invention.
  • thermoplastic elastomers or rubbers with thermoplastic materials are particularly suitable: styrene elastomers with PP, PA, PC, PET or PBT, polyolefin elastomers with PP or PA, polyamide elastomers with PA, polyurethane elastomers with PA, ABS, POM, PC, PET, PBT or PVC, polyester elastomers with PA, PET or PBT, nitrile rubber with PA, POM, PET or PBT and silicone rubber with PET or PBT, the rubbers are preferably additionally modified.
  • Roller layer and PBT or PA is preferably used for the inner roller layer.
  • other combinations can be just as suitable.
  • the roller shaft can simply have a smooth surface.
  • the depressions can, for example, be axial, radial or spiral notches, but also regular or irregular local depressions, the elevations can accordingly have the shape of axial, radial or spiral grooves or webs or represent any regular or irregular local elevations.
  • the axial securing between the outer and the inner roller layer is brought about by the shape of the outer roller layer.
  • the outer roller layer can have, for example, one or more radially arranged annular beads or webs or a curved cross section on the side facing the inner roller layer.
  • the subsequently injected inner roller layer adapts to this shape and thus ensures a snug fit between the inner and outer roller layers.
  • the outer roller layer is only manufactured in the tool, it is possible to use two opposing slides, the end faces of which touch when closed. If the end faces are tapered on their outer radius, for example by a bevel or a similar shape, an annular bead is formed during the injection molding of the outer roller layer.
  • the slider can also be tapered over part or all of the length entering the tool towards its end face, as a result of which the inner surface of the outer roller layer is given a curved cross section.
  • the shape of the inner roller layer adapts to the shape of the outer roller layer, whereby a fit between the inner and outer roller layer is achieved with free rotation.
  • the shape of the plastic roll produced by the process according to the invention itself depends on the desired design.
  • the plastic roller can be cylindrical, for example. But it is also easily possible to make the outer shape of the outer roller layer spherical or any other way.
  • the plastic rollers produced according to the invention can generally be used as rollers for objects to be moved on rollers. Examples of such uses are furniture such as desk chairs, computer tables, filing or serving trolleys, roll containers, suitcases and shopping and luggage trolleys. The invention is explained in more detail below with the aid of exemplary embodiments 1 and 2 and FIGS. 1 to 8.
  • Embodiment 1 Production of a plastic roller consisting of a roller shaft, an outer roller layer and an inner roller layer.
  • Figure 1 shows a cross section through a cylindrical cavity in an injection mold, in which a roller shaft 1 is placed in the axis of the plastic roller to be manufactured.
  • Two oppositely arranged around the roller shaft 1 around slide 4 which have the shape of cylindrical shells and whose outer end face edges are concavely tapered, are closed so that their end faces touch and an outer one in the cavity where the outer roller layer is to be formed Cavity 3a remains.
  • a slide-modified plastic 3b is injected into these.
  • FIG. 2 shows the cavity with the hardened outer roller layer 3 and the opened slides 4. Between the roller shaft 1 and the outer roller layer 3 there is an inner cavity 2a where the inner roller layer is to be created. In a second process step, a thermoplastic plastic 2b is injected into these.
  • Figure 3 shows a cross section through the injection molded part removed from the mold, consisting of a roller shaft 1, an inner roller layer 2 and an outer roller layer 3. There is firm adhesion between the roller shaft 1 and the inner roller layer 2.
  • the outer roller layer 3 is at stable axial fit over a sliding gap 6 around the inner roller layer 2 easily rotatable.
  • Figure 4 shows the injection molded part, i.e. the plastic roller in perspective.
  • Exemplary embodiment 2 Production of a plastic roller consisting of an outer roller layer, an inner roller layer and a roller shaft with an elastomeric covering.
  • Figure 5 shows a cross section through a cylindrical cavity in an injection mold, in which a roller shaft 1 in the axis of the to be manufactured
  • Plastic roll is submitted.
  • a slide-modified plastic 3b is injected into the outer cavity 3a and a thermoplastic elastomer 5b is injected into the inner cavity 5a.
  • FIG. 6 shows the cavity with the solidified elastomeric casing 5, the hardened outer roller layer 3 and the opened slides 4. Between the elastomeric casing 5 and the outer roller layer 3 there is a central cavity 2a where the inner roller layer is to be created. In a further process step, a thermoplastic plastic 2b is injected into these.
  • FIG. 7 shows a cross section through that removed from the tool
  • Injection molded part consisting of a roller shaft 1, an elastomeric casing 5, an inner roller layer 2 and an outer roller layer 3. Between the roller shaft 1, the elastomeric jacket 5 and the inner roller layer 2 there is firm liability. With a stable axial fit, the outer roller layer 3 can be easily rotated about the inner roller layer 2 via a sliding gap 6.
  • Figure 8 shows the injection molded part, i.e. the plastic roller in perspective.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Abstract

Des rouleaux en matière plastique pouvant effectuer une rotation sont fabriqués de la façon suivante: soit on injecte une matière thermoplastique entre un arbre de rouleau et une couche de roulement extérieure, matière qui, suite à une contraction du volume, lors du refroidissement, se resserre sur l'arbre de rouleau et s'écarte de la couche de roulement extérieure, soit, selon un procédé de moulage par injection à plusieurs composants, on injecte d'abord la couche extérieure de roulement, puis on injecte entre celle-ci et l'arbre de rouleau une matière thermoplastique qui ensuite se resserre également sur l'arbre de rouleau et s'écarte de la couche de roulement extérieure. Selon ce procédé, on obtient des rouleaux en matière plastique constitués d'une couche de roulement intérieure (2) reliée rigidement à l'arbre de rouleau (1) et d'une couche de roulement extérieure (3) pouvant tourner librement contre ladite couche intérieure dont elle est séparée par un espace de glissement (6). L'arbre de rouleau peut, au choix, être également entouré d'un élastomère thermoplastique. Ces opérations peuvent être réalisées dans le même procédé, par moulage par injection à plusieurs composants.
EP98962429A 1997-12-15 1998-12-09 Rouleaux en matiere plastique pouvant effectuer une rotation Withdrawn EP1037751A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19755725 1997-12-15
DE19755725A DE19755725C2 (de) 1997-12-15 1997-12-15 Drehbewegliche Kunststoffrollen
PCT/EP1998/007995 WO1999030913A1 (fr) 1997-12-15 1998-12-09 Rouleaux en matiere plastique pouvant effectuer une rotation

Publications (1)

Publication Number Publication Date
EP1037751A1 true EP1037751A1 (fr) 2000-09-27

Family

ID=7851985

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98962429A Withdrawn EP1037751A1 (fr) 1997-12-15 1998-12-09 Rouleaux en matiere plastique pouvant effectuer une rotation

Country Status (6)

Country Link
US (1) US6444065B1 (fr)
EP (1) EP1037751A1 (fr)
JP (1) JP2002508271A (fr)
AU (1) AU1759999A (fr)
DE (1) DE19755725C2 (fr)
WO (1) WO1999030913A1 (fr)

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Publication number Priority date Publication date Assignee Title
CN1178829C (zh) * 2000-06-30 2004-12-08 普乐士文具株式会社 薄膜转送工具和用于其转送头的小直径辊的制造方法
DE10361190A1 (de) 2003-12-24 2005-07-28 Ticona Gmbh Verbundkörper, Verfahren zu dessen Herstellung und dessen Verwendung
PL1744982T3 (pl) * 2004-05-12 2009-03-31 Sca Hygiene Prod Ab Dwuczęściowy korek końcowy do wkładania w koniec rolki papieru
AT503968B1 (de) * 2006-05-05 2009-03-15 Gottfried Steiner Ingenieurbue Spritzgiessanlage
EP1876116A1 (fr) * 2006-06-26 2008-01-09 Carl Freudenberg KG Galet de guidage et de transport
JP4228238B2 (ja) * 2006-08-18 2009-02-25 セイコーエプソン株式会社 ローラ成形装置、ローラ成形用金型、ローラ製造方法
DE102008037106B4 (de) * 2008-08-08 2013-04-11 Maschinen- Und Stahlbau Julius Lippert Gmbh & Co. Kg Tragrolle für eine zum Transport von Gütern, wie Brennhilfsmitteln oder dergleichen vorgesehene Rollenbahn
JP5671471B2 (ja) * 2008-12-04 2015-02-18 バイエル・マテリアルサイエンス・アクチェンゲゼルシャフトＢａｙｅｒ ＭａｔｅｒｉａｌＳｃｉｅｎｃｅ ＡＧ 接着接合させた複合プラスチック構造部材、それらの製造方法、およびそれから製造した構造部材
DE102009036009A1 (de) * 2009-08-04 2011-04-07 Snap-On Equipment Gmbh Kunststoff-Laufrolle für einen Kraftfahrzeug-Bremsprüfstand auf einen solchen Bremsprüfstand
CN102782342B (zh) * 2009-10-02 2014-11-26 日本艾礼富株式会社 接近传感器、接近传感器的安装结构及接近传感器的制造方法
WO2011146951A1 (fr) * 2010-05-25 2011-12-01 Julius Blum Gmbh Corps de roulement de la cage d'un chariot de roulement pour guides à tiroir
EP2605083B1 (fr) * 2011-12-16 2014-09-10 ETA SA Manufacture Horlogère Suisse Palier lisse d'horlogerie surmoulé
JP2015033813A (ja) * 2013-08-09 2015-02-19 住友電工ファインポリマー株式会社 Ｏａ機器用ローラーの製造方法
EP2894048A1 (fr) * 2014-01-10 2015-07-15 Eku Ag Galet de roulement notamment pour portes coulissantes
DE102018214823A1 (de) * 2018-08-31 2020-03-05 Bayerische Motoren Werke Aktiengesellschaft Spritzgusswerkzeug
AT522815B1 (de) * 2019-07-25 2021-02-15 Blum Gmbh Julius Laufwagen für eine Schubladenausziehführung
JP7482092B2 (ja) 2021-09-02 2024-05-13 照男 竹中 双輪キャスター

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Also Published As

Publication number Publication date
WO1999030913A1 (fr) 1999-06-24
US6444065B1 (en) 2002-09-03
DE19755725A1 (de) 1999-06-24
JP2002508271A (ja) 2002-03-19
DE19755725C2 (de) 1999-10-28
AU1759999A (en) 1999-07-05

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