FR2560113A1 - Plastic low friction slides - Google Patents

Plastic low friction slides Download PDF

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Publication number
FR2560113A1
FR2560113A1 FR8500608A FR8500608A FR2560113A1 FR 2560113 A1 FR2560113 A1 FR 2560113A1 FR 8500608 A FR8500608 A FR 8500608A FR 8500608 A FR8500608 A FR 8500608A FR 2560113 A1 FR2560113 A1 FR 2560113A1
Authority
FR
France
Prior art keywords
sliding element
friction
sintering
use according
polyethylene
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Withdrawn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
FR8500608A
Other languages
French (fr)
Inventor
Hans Geng
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.)
Plastik Maschbau Co KG GmbH
Original Assignee
Plastik Maschbau Co KG 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 Plastik Maschbau Co KG GmbH filed Critical Plastik Maschbau Co KG GmbH
Publication of FR2560113A1 publication Critical patent/FR2560113A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C5/00—Skis or snowboards
    • A63C5/04—Structure of the surface thereof
    • A63C5/056—Materials for the running sole
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/475—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pistons, accumulators or press rams
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/16—Fillers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0003—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular electrical or magnetic properties, e.g. piezoelectric
    • B29K2995/0005—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0063—Density
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0088—Molecular weight
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/52—Sports equipment ; Games; Articles for amusement; Toys
    • B29L2031/5263—Skis

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Microscoopes, Condenser (AREA)

Abstract

A polyethylene section, partic. a flat shape, produced by ram extrusion, is used as a low friction slide provided that its thickness is less than 3 mm and molecular weight is greater than 10 power 6.

Description

L'invention concerne l'utilisation d'une section (ou d'une découpe) d'un profilé de matière plastique en polyéthylène, en particulier d'un profilé plat en tant qu'éliment de glissement. Des éléments de glissement de ce genre sont utilisés dans diverses branches de la technique ou le frottement par glissement doit être absorbé autant que possible sans agent antifriction ou lubrifiant. Souvent, l'élément de glissement est fixé à cet effet sur un support au moyen de vis à tête conique, par collage ou d'une autre manière. En particulier, des patins appelés brièvement skis dans la pratique récente et utilisés pour l'exercice du ski sont munis à leur face inférieure d'un élément de glissement de ce genre. Il importe toujours que l'élément de glissement présente à l'égard des frottements rencontrés un faible coefficient de frottement ainsi qu'une longue durabilité ou durée de vie. The invention relates to the use of a section (or cut) of a polyethylene plastic profile, in particular a flat profile as a sliding food. Such sliding elements are used in various branches of the art where sliding friction should be absorbed as much as possible without anti-friction agent or lubricant. Often, the sliding element is fixed for this purpose on a support by means of screws with conical head, by gluing or in another way. In particular, skates briefly called skis in recent practice and used for skiing are provided on their underside with a sliding element of this kind. It is always important that the sliding element has, with respect to the friction encountered, a low coefficient of friction as well as a long durability or service life.

Dans le cadre des mesures bien connues, le profilé de matière plastique est conformé par tranchage ou fendage à partir d'un rond ou d'une plaque moulés. Habituellement, de tels éléments de glissement sont également réalisés à partir d'un bloc de matière plastique correspondant, par usinage par enlèvement de copeaux. Cela est onéreux et, de plus, les éléments de glissement ne satisfont que de manière incomplète aux exigences imposées par l'effort de frottement. Souvent, le coefficient de frottement ne répond pas aux exigences et, en outre, la durée de vie est trop courte. Pour améliorer le coefficient de frottement, il est connu de soumettre la surface à un polissage par des mesures particulières et d'obturer auparavant des pores formés dans la masse.Même après la réalisation de telles mesures supplémentaires, le coefficient de frottement et la durée de vie ne satisfont souvent pas aux exigences. In the context of well-known measurements, the plastic profile is shaped by slicing or splitting from a molded round or plate. Usually, such sliding elements are also produced from a corresponding block of plastic material, by machining by removing chips. This is expensive and, moreover, the sliding elements only partially meet the requirements imposed by the friction force. Often the coefficient of friction does not meet the requirements and, moreover, the service life is too short. To improve the coefficient of friction, it is known to subject the surface to polishing by means of special measures and to seal pores formed in the mass beforehand. Even after carrying out such additional measurements, the coefficient of friction and the duration of lives often do not meet the requirements.

La présente invention a pour objet de créer un profilé de matière plastique qui, utilisé comme profilé de glissement, se dis#tingue par un coefficient de frottement extrêmement faible avec une durée de vie étonnamment élevée. The object of the present invention is to create a plastic profile which, when used as a sliding profile, is distinguished by an extremely low coefficient of friction with a surprisingly long service life.

Selon l'invention, ce but est atteint par l'utilisation d'une section d'un profilé de matière plastique en polyéthylène, en particulier d'un profilé plat, lequel profilé de matière plastique a été ralis par extrudosintérisation, comme élément de glissement sous réserve que l'épaisseur de paroi (abstraction faite de nervures éventuellement conformées) soit inférieure à 3 mm et que le poids moléculaire dépasse 1 million. Le terme polyéthylène désigne notamment du polyéthylène basse pression bien que l'invention ne soit pas limitée à la mise en oeuvre de polyéthylène basse pression mais comprenne également le polyéthylène haute pression. Le terme extrudo-sintérisation désigne un procédé d'extrusion particulier qui fonctionne avec une boudineuse hydraulique (cf. DE-PS 28 29 232). According to the invention, this object is achieved by the use of a section of a polyethylene plastic profile, in particular of a flat profile, which plastic profile has been produced by extrudosintering, as a sliding element. provided that the wall thickness (apart from possibly shaped ribs) is less than 3 mm and that the molecular weight exceeds 1 million. The term polyethylene notably designates low pressure polyethylene although the invention is not limited to the use of low pressure polyethylene but also includes high pressure polyethylene. The term extrudo-sintering designates a particular extrusion process which works with a hydraulic extruder (cf. DE-PS 28 29 232).

L'élément à mettre en oeuvre selon l'invention peut être utilisé en particulier à des températures inférieures à OOC, ctest-à-dire qutil peut être placé, par exemple collé, à la face inférieure d'un ski. En vue d'améliorer la résistance purement mécanique de l'élément de glissement, l'invention prévoit de mélanger le polyéthylène avant ltextrudo-sintérisation avec des fibres de renforcement. The element to be used according to the invention can be used in particular at temperatures below OOC, that is to say that it can be placed, for example glued, to the underside of a ski. In order to improve the purely mechanical resistance of the sliding element, the invention provides for mixing the polyethylene before the extrusion-sintering with reinforcing fibers.

Pour ce qui est desdites fibres de renforcement, il peut s'agir de fibres minérales, de fibres de carbone, de fibres métalliques ou encore de fibres synthétiques. De façon inattendue, le coefficient de frottement à la surface de l'élément de glissement n'est pas modifié par ces additions parce que les fibres de renforcement restent à l'intérieur de l'élément de glissement et n'affectent pas la structure de la surface. Il va de soi qu'il convient d'éviter l'addition de quantités excessives de fibres de renforcement. Un optimum entre le comportement mécanique d'une part et le coefficient de frottement, d'autre part, peut être trouvé facilement par tâtonnement. Il est prévu dans le cadre de l'invention de mélanger le polyéthylène avant ltextrudo- sintérisation avec des substances conductrices à grains fins ou à fibres fines.Il est ainsi possible, sans préjudice porté au coefficient de frottement, de conférer à l'élément de glissement des propriétés antistatiques suffisantes.As regards said reinforcing fibers, they may be mineral fibers, carbon fibers, metallic fibers or even synthetic fibers. Unexpectedly, the coefficient of friction on the surface of the sliding element is not modified by these additions because the reinforcing fibers remain inside the sliding element and do not affect the structure of the surface. It goes without saying that the addition of excessive amounts of reinforcing fibers should be avoided. An optimum between the mechanical behavior on the one hand and the coefficient of friction, on the other hand, can be easily found by trial and error. It is intended within the framework of the invention to mix the polyethylene before the extrudosintering with conductive substances with fine grains or fine fibers. It is thus possible, without prejudice to the coefficient of friction, to give the element of slip sufficient antistatic properties.

Les avantages obtenus résident dans le fait qu'un élément de glissement selon l'invention se distingue par un coefficient de frottement étonnamment faible et par une durée de vie étonnamment longue. Cela est probablement du au fait que lors de ltextrudomsintérisation appliquée selon l'invention, en tenant compte d'obligations spéciales essentielles pour l'invention, on obtient des orientations moléculaires et des enchaînements intramoléculaires particuliers qui agissent positivement sur le coefficient de frottement et sur la durée de vie. Des valeurs particulièrement faibles en ce qui concerne le coefficient de frottement et des valeurs particulièrement élevées quant à la durée de vie sont obtenues lorsque l'élément de glissement est utilisé de telle façon que la direction de l'extrudo-sintérisation colncide avec la direction de l'effort de frottement de l'élément de glissement. Mais des avantages particuliers sont obtenus même lorsque les directions mentionnées sont opposées l'une à l'autre. Il convient d'éviter autant que possible un effort de frottement avec une composante prineipale orientée perpendiculairement à la direction de l'extrudosintérisation.  The advantages obtained reside in the fact that a sliding element according to the invention is distinguished by a surprisingly low coefficient of friction and by a surprisingly long service life. This is probably due to the fact that during the extrusion sintering applied according to the invention, taking into account special obligations essential for the invention, we obtain molecular orientations and specific intramolecular sequences which act positively on the coefficient of friction and on the lifetime. Particularly low values with regard to the coefficient of friction and particularly high values with regard to the service life are obtained when the sliding element is used in such a way that the direction of extrudo-sintering coincides with the direction of the friction force of the sliding element. But particular advantages are obtained even when the directions mentioned are opposite to each other. It is advisable to avoid as much as possible a friction force with a main component oriented perpendicular to the direction of extrudosintering.

Claims (5)

REVENDICATIONS 1. Utilisation d'une section d'un profilé de matière plastique, en particulier d'un profilé plat, lequel profilé de matière plastique a été réalisé par extrudosintérisation, en tant qu'élément de glissement, caractérisée par le fait que l'épaisseur de paroi est inférieure S 3 mm et que le poids moléculaire dépasse 1 million. 1. Use of a section of a plastic profile, in particular a flat profile, which plastic profile has been produced by extrudosintering, as a sliding element, characterized in that the thickness wall thickness is less than 3 mm and the molecular weight exceeds 1 million. 2. Utilisation selon la revendication 1, caractérisée par le fait que la direction de l'extrudo-sintérisation coincide avec la direction de l'effort de frottement de l'élément de glissement. 2. Use according to claim 1, characterized in that the direction of the extrudo-sintering coincides with the direction of the friction force of the sliding element. 3. Utilisation selon l'une des revendications 1 ou 2, caractérisée par le fait que l'élément de glissement est mis en oeuvre à des températures inférieures à OOC.  3. Use according to one of claims 1 or 2, characterized in that the sliding element is implemented at temperatures below OOC. 4. Utilisation selon l'une quelconque des revendications 1 à 3, caractérisée par le fait que le polyéthylène est mélangé avant l'extrudo-sintérisation avec des fibres de renforcement. 4. Use according to any one of claims 1 to 3, characterized in that the polyethylene is mixed before extrudo-sintering with reinforcing fibers. 5. Utilisation selon l'une quelconque des revendications 1 à 4, caractérisée par le fait qu le polyéthylène est mélangé avant l'extrudo-sintérisation avec des susbstancesconductrices à grains fins ou à fibres fines.  5. Use according to any one of claims 1 to 4, characterized in that the polyethylene is mixed before extrudo-sintering with fine grain or fine fiber conductive substances.
FR8500608A 1984-01-19 1985-01-16 Plastic low friction slides Withdrawn FR2560113A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19843401669 DE3401669A1 (en) 1984-01-19 1984-01-19 Sliding component in the form of a section from a plastic profile made from polyethylene

Publications (1)

Publication Number Publication Date
FR2560113A1 true FR2560113A1 (en) 1985-08-30

Family

ID=6225300

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8500608A Withdrawn FR2560113A1 (en) 1984-01-19 1985-01-16 Plastic low friction slides

Country Status (6)

Country Link
DE (1) DE3401669A1 (en)
FI (1) FI844757L (en)
FR (1) FR2560113A1 (en)
IT (1) IT1183108B (en)
NO (1) NO844637L (en)
SE (1) SE8500250L (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2414185A1 (en) * 1974-03-23 1975-10-09 Loba Holmenkol Chemie Lhc RUNNING SURFACE FOR SPORTS EQUIPMENT FOR GLIDING AND WALKING OVER SNOW AND ICE SURFACES, E.G. SKI
SE7806170L (en) * 1977-06-10 1978-12-11 Norsk Skiforsk GRASS-FREE SKI COAT OF PLASTIC AND KIT FOR ITS MANUFACTURE
DE2829232C2 (en) * 1978-07-03 1983-10-20 Ruhrchemie Ag, 4200 Oberhausen Process for the production of moldings from high molecular weight low-pressure polyethylene
SE7903117L (en) * 1979-04-09 1980-10-10 Electrolux Ab KIT AND DEVICE FOR A COMBINED REFRIGERATOR AND FREEZER FURNITURE

Also Published As

Publication number Publication date
SE8500250L (en) 1985-07-20
FI844757L (en) 1985-07-20
IT8519074A0 (en) 1985-01-11
SE8500250D0 (en) 1985-01-18
FI844757A0 (en) 1984-12-03
DE3401669A1 (en) 1985-08-01
IT1183108B (en) 1987-10-05
IT8519074A1 (en) 1986-07-11
NO844637L (en) 1985-07-22

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