EP1339297A2 - Element de fermeture par adherence en matiere plastique a memoire de forme - Google Patents

Element de fermeture par adherence en matiere plastique a memoire de forme

Info

Publication number
EP1339297A2
EP1339297A2 EP01999213A EP01999213A EP1339297A2 EP 1339297 A2 EP1339297 A2 EP 1339297A2 EP 01999213 A EP01999213 A EP 01999213A EP 01999213 A EP01999213 A EP 01999213A EP 1339297 A2 EP1339297 A2 EP 1339297A2
Authority
EP
European Patent Office
Prior art keywords
shape memory
plastic material
shape
block
adhesive
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Withdrawn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
EP01999213A
Other languages
German (de)
English (en)
Inventor
Axel Schulte
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.)
Gottlieb Binder GmbH and Co KG
Original Assignee
Gottlieb Binder GmbH and Co KG
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 Gottlieb Binder GmbH and Co KG filed Critical Gottlieb Binder GmbH and Co KG
Publication of EP1339297A2 publication Critical patent/EP1339297A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
    • A44B18/00—Fasteners of the touch-and-close type; Making such fasteners
    • A44B18/0069—Details
    • A44B18/0096—Shape memory materials
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
    • A44B18/00—Fasteners of the touch-and-close type; Making such fasteners
    • A44B18/0046—Fasteners made integrally of plastics
    • A44B18/0049—Fasteners made integrally of plastics obtained by moulding processes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/12—Shape memory
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24008—Structurally defined web or sheet [e.g., overall dimension, etc.] including fastener for attaching to external surface
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24008—Structurally defined web or sheet [e.g., overall dimension, etc.] including fastener for attaching to external surface
    • Y10T428/24017—Hook or barb

Definitions

  • Adhesive fastener part made of plastic material with shape memory
  • the invention relates to an adhesive fastener part, consisting of a carrier part, which is provided on at least one side with adhesive fastener elements of a predeterminable hooking shape and / or orientation.
  • DE 198 28 856 C1 discloses a method for producing an adhesive closure part and thus an adhesive closure part itself with a large number of adhesive closure elements in one piece with a support part in the form of stems with end-side thickenings, a thermoplastic plastic in a plastic or liquid state Gap is fed between a pressure roller and a form roller and these are driven such that the carrier part is formed in the gap and is conveyed in a transport direction, in which a screen having continuous cavities is used as the shaping element on the form roller and in which the adhesive closure elements there are formed by that the thermoplastic material at least partially hardens in the cavities of the sieve.
  • at least the molding roll is tempered. With the solidification of the plastic material, the shape and the appearance of the adhesive fastener part are fixed in shape and neither the appearance of the hook shape nor the shape Orientation of the fastener elements changes after making the described production.
  • EP 0 374 961 B1 discloses a shaped part with shape memory, in which a shaped shape is frozen, which is formed by shaping a polymer resin with shape memory into a desired shape at a temperature above Ta, then reshaping it into one of the shaped shape various shapes are formed at a temperature not higher than Ta and cooling the formed product to a temperature not higher than Tb, wherein the shape memory polymer resin consists essentially of a block copolymer having a weight average molecular weight in the range of 10,000 to 1,000,000 and having a linear type block structure or a grafted type block structure.
  • the block copolymer material has a polymer block A which is crosslinked with a polymer block B, and the polymer resin used has the property that the glass transition temperature Ta of the phase containing the polymer block A and the crystal melting point Tb of the phase containing the polymer block B in the represented by the following formula:
  • the known molded part can be produced using a conventional shaping process, for example in the form of an extrusion or extrusion process, and the geometry once produced changes as soon as the corresponding glass transition temperature is exceeded.
  • the result is a new molded part with different geometries compared to the previous molded part, the original state being able to be restored after the glass transition temperature has dropped below the plastic material.
  • the process of changing the shape is therefore reversible, the newly created shape of the adhesive closure part not changing as long as a temperature above the glass transition temperature is maintained.
  • the plastic material used with shape memory therefore changes from an essentially amorphous structure to a directed crystalline substructure with a new geometry. Furthermore, with this known molded part, only a simple, one-off modification of the geometric molded part dimensions is possible.
  • PCT / WO 99/42528 discloses a polymer-based plastic material with shape memory, with which more than two geometrical shape changes are possible for a molded part.
  • the polymer composition has a hard constituent with a glass transition temperature between -40 ° C. and 270 ° C., in addition to this hard constituent at least two further soft constituents being cross-linked with one another.
  • the soft components have a glass transition temperature that is at least 10 ° C lower than that of the previous soft component, with a soft component with the highest glass transition temperature having one that is at least 10 ° C lower than the glass transition temperature of the hard component composite material.
  • PCT / WO 00/62637 discloses a releasable closure made of separable Velcro elements which have hooking elements on the surface to be connected, which elements are present when the Velcro elements are joined together interlock with one another and hold the Velcro elements together, the interlocking elements made of plastic material having a metallic shape memory alloy which, in the manner of bimetals and depending on the temperature, undergo cyclic and reversible individual shape states.
  • the known Velcro elements consist of a flat structure made of a woven polyamide fiber, into which a bimetallic wire, for example made of a nickel titanium alloy, was woven in such a way that eyelets protruding from the Velcro element are first created, which are cut open on one side in a subsequent process, so that the hook-shaped hooking elements are formed. Due to the temperature, the alloy wire mentioned undergoes a change in shape during the transition between the martensitic and austenitic phase, which is used to open the interlocking elements and which is designed to be reversible as a function of the temperature and again to close the interlocking elements.
  • the known closure is expensive and complex to manufacture and correspondingly heavy with regard to the metal materials used, which has a particularly disadvantageous effect when used in the vehicle or aircraft industry.
  • the invention has for its object to provide an adhesive fastener part made exclusively of plastic, the fastener elements can still assume different geometries even after their manufacture, which is easy to build and inexpensive to manufacture.
  • a corresponding object is achieved by an adhesive closure part with the features of claim 1 in its entirety.
  • the adhesive fastener elements a plastic material with Forminne- tion capacity such that when passing through different energy states, in particular at different temperatures, each of the adhesive fastener elements assumes a different form of hooking and / or orientation than the initially specified type of hooking and / or orientation, it is possible to produce an adhesive fastener part which has been produced in this way via an energy input change geometrically that the adhesive fastener is more versatile.
  • the production of Haftverschi ußer can be significantly simplified and carried out inexpensively if one first creates a type of basic shape of the Haftversc lußteil in a first molding process and then changes this basic shape using the shape memory of the plastic such that in a further second or further subsequent Shaping step, the adhesive fastener part with its desired adhesive fastener elements with their actually desired geometries and orientations is obtained.
  • the energy states to be introduced into the adhesive fastener material are preferably selected in the same way as the glass transition temperatures of the plastic material itself, so that at any rate at normal ambient temperatures, such as those occurring in the environment, there is a permanent adhesive fastener and the desired geometries do not change unintentionally.
  • the adhesive fastener part according to the invention is explained in more detail below with reference to the figures in the special description.
  • the show 1 to 4 in detail and in principle and not to scale the different shape behavior of the fastener part with shape memory.
  • the Haftyerschlußteil consists of a band-like or film-like carrier part 10 which carries on one upper side as a whole designated 12 adhesive fastener elements.
  • adhesive fastener elements 12 are generally arranged in consecutive rows one behind the other and next to one another, with only a section of a number of adhesive fastener elements 12 on the carrier part 10 being considered in FIGS. 1 to 4. Furthermore, the
  • adhesive fastener elements 12 have a particularly small geometric design and are therefore also known and usable as micro-adhesive fasteners.
  • Adhesive fastener elements 12 are formed from a plastic material with shape memory in such a way that when different energy states are passed through, in particular at different temperatures, each of the self-adhesive fastener elements 12 assumes a different form of hooking and / or orientation than the initially specified type of hooking and / or orientation.
  • a predeterminable energy state or energy range in particular temperature state or temperature range, can be assigned a specific form of hooking and / or orientation of the adhesive fastener elements 12.
  • the changes in geometry that occur for the adhesive fastener elements 12 are held reversibly. In order to get from one shape state to the next shape state and vice versa, using the shape memory of the plastic material, each shape state is first mechanically pre-embossed using a conventional plastic molding process.
  • the plastic material with the shape memory is preferably a block copolymer and has at least one block portion A with a glass transition temperature between -60 ° C and 300 ° C, in particular between -40 ° C and 270 ° C, preferably between 30 ° C and 150 ° C.
  • the block copolymer has a further block component B with a glass transition temperature which is at least 10 ° C. lower than that of the block component A.
  • the two block components A, B are cross-linked accordingly.
  • FIG. 1 An example of this is shown in FIG. 1.
  • a carrier part 10 with simple fastening bars 14 is first produced.
  • fastening stems 14 which are still heated by the first shaping process, are cooled and a predetermined amount of energy is withdrawn from them, preferably only at the free end of the fastening stems 14, these are shaped in a second mechanical shaping step into spherical interlocking shapes for the adhesive fastener elements 12, as they are viewed in the direction of view of FIG.
  • the spherical interlocking elements can also move again in the mounting stem 14 according to the left representation. Otherwise, the spherical interlocking elements are dimensionally stable at the usually prevailing ambient temperatures and can absorb forces.
  • the fastening stem 14 are mechanically formed at a high molding temperature, for example at 150 ° C, and that when the material cools to room or ambient temperature, the spherical interlocking elements according to Fig.1 their automatically take the second mechanically predetermined shape. These then retain their shape and orientation after the glass transition temperature has been exceeded from high to low temperatures and it would be an energy supply step, in particular a temperature increase step above that specific glass transition temperature is necessary in order to redesign it into the mounting stem 14 shown.
  • the adhesive fastener elements 12 made of the plastic material are fundamentally elastic, there is the possibility, for example for a technical application, of connecting two identical adhesive fastener parts with spherical hooking heads to form an adhesive fastener, the spherical hooking heads of the one adhesive fastener part then Interactably engage the distances between two adjacent spherical head hook shapes of the other fastener part.
  • a simple change in the energy state, in particular the temperature can then be used to connect or detach an adhesive closure constructed in this way in a simple and reliable manner without having to apply greater actuation forces by hand, as is the case with conventional closures.
  • adhesive fastener elements 12 are produced in double hook arrangement on the carrier part 10 in a customary and therefore not described plastification manufacturing process, which are formed in the image direction from pairs of single hook elements arranged one behind the other. If the relevant design undergoes a low energy state after a further mechanical shaping process, for example during cooling, the individual hook elements of each double hook experience a different, initially predetermined orientation and are spread apart. The corresponding different orientation of the spread-out fastener elements 12 is shown on the right in FIG. The double arrows in FIG. 2 are again intended to clarify that the process can take place reversibly. When cooling to normal ambient temperature, keep ten the fastener elements 12 due to their shape memory then in their spread position and a loop material not shown in detail of another fastener part can engage accordingly under the hooks of the spread fastener elements 12 to create the fastener.
  • the respective glass transition temperature of each further block part always being at least 10 ° C. is selected to be lower than the glass transition temperature of the preceding block portion.
  • the starting plastic material for the embodiment according to FIGS. 3 and 4 has a hard block portion A of a block copolymer with a glass transition temperature of 150 ° C.
  • the block copolymer has a block fraction B, the glass transition temperature of which is approximately 100 ° C., and a further block fraction C with a glass transition temperature of, for example, 50 ° C. occurs.
  • the fastening stems 14 are provided with incisions 16 at the ends and in a first defined cooling step with shaping, the fastening stems 14 assume the geometry shown in the middle, in which the ends of the stem material, which delimit the incisions 16, in The three-way arrangement can be spread apart. If one cools down further and passes through the second glass transition temperature, for example in the order of magnitude of 50 ° C. with further shaping, the free ends of the stem material are bent over and there is a triple hook or an anchor element for the adhesive closure part.
  • the double arrow arrangement again makes the possible reversal sequence clear between the mechanically predetermined system states.
  • the hooking shape of the adhesive fastener elements 12 can be made from a loop material (not shown) or from hooking heads, such as hooks (Fig. 3), double hooks (Fig. 2) or multiple hooks (see Fig. 4), anchor elements, hooking stems 14 (see Fig. 1) - also with incisions at the ends . '16 provided (see Fig. 4) or (spherical) hooking mushrooms (see Fig. 1) exist which, in addition to a possible first geometrical initial arrangement due to their shape memory, reversibly adopt at least one other geometrical arrangement which is predetermined by a mechanical shaping process. In the case of the loop material mentioned, a change in length or orientation can be achieved in particular.
  • the plastic material with shape memory can be provided with chitosans, carboxymethyl cellulose and / or biodegradable plastic materials.
  • one of the block portions of the block copolymer is formed as a polymer block which is a homopolymer of a vinylaromatic compound, a copolymer of a vinylaromatic compound or another vinylaromatic compound and a conjugated diene compound and / or a hydrogenation product thereof contains.
  • the other block portion is preferably a polymer block containing a homopolymer of butadiene, a copolymer of butadiene with another conjugated diene compound, a copolymer of butadiene with a vinyl aromatic compound and / or a hydrogenation product of these polymers.
  • Energy means such as ultrasound, light, in particular in the form of laser light, moisture (H 2 0), electrical current, are used to achieve various energy states for the plastic material with shape memory. Magnetic fields, temperature, pressure and mass changes that are used individually or in combinations with each other.

Abstract

L'invention concerne un élément de fermeture par adhérence, comprenant un élément support (10) qui est muni, sur au moins l'une de ses faces, d'éléments de fermeture par adhérence (12) d'une forme de crochet et/ou d'une orientation prédéterminées. L'invention est caractérisée en ce qu'au moins les éléments de fermeture par adhérence (12) présentent une matière plastique à mémoire de forme, telle que chacun desdits éléments, lorsqu'il est soumis à des états énergétiques différents, notamment à des températures différentes, prend une forme de crochet et/ou une orientation qui diffèrent de la forme et/ou de l'orientation prédéterminées initiales. De cette façon, il est possible d'obtenir un élément de fermeture par adhérence qui, une fois produit, peut être géométriquement modifié par apport d'énergie, de telle sorte que ledit élément de fermeture peut être utilisé avec une grande souplesse d'emploi.
EP01999213A 2000-12-08 2001-12-05 Element de fermeture par adherence en matiere plastique a memoire de forme Withdrawn EP1339297A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10061952A DE10061952A1 (de) 2000-12-08 2000-12-08 Haftverschlußteil aus Kunststoffmaterial mit Formerinnerungsvermögen
DE10061952 2000-12-08
PCT/EP2001/014232 WO2002045536A2 (fr) 2000-12-08 2001-12-05 Element de fermeture par adherence en matiere plastique a memoire de forme

Publications (1)

Publication Number Publication Date
EP1339297A2 true EP1339297A2 (fr) 2003-09-03

Family

ID=7666887

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01999213A Withdrawn EP1339297A2 (fr) 2000-12-08 2001-12-05 Element de fermeture par adherence en matiere plastique a memoire de forme

Country Status (4)

Country Link
US (1) US20040033336A1 (fr)
EP (1) EP1339297A2 (fr)
DE (1) DE10061952A1 (fr)
WO (1) WO2002045536A2 (fr)

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USRE42475E1 (en) 2001-06-04 2011-06-21 Velcro Industries B.V. Fasteners engageable with loops of nonwoven fabrics and with other open structures, and methods and machines for making fasteners
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Also Published As

Publication number Publication date
DE10061952A1 (de) 2002-06-27
WO2002045536A3 (fr) 2003-01-30
US20040033336A1 (en) 2004-02-19
WO2002045536A2 (fr) 2002-06-13

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