Method of making and using a touch fastener with magnetic attractant

• US 5,932,311 A
• Filed: 03/05/1998
• Issued: 08/03/1999
• Est. Priority Date: 02/17/1995
• Status: Expired due to Term

• Current Assignee: Velcro Industries BV (Chartwell Industries Ltd)
• Original Assignee: Velcro Industries BV (Chartwell Industries Ltd)
• Inventors: Jacobs, Martin I., Routhier, Brian J., Kenney, Randall B.
• Primary Examiner(s): THOMAS, ALEXANDER S
• Application Number:
  US09/035,225
• Time in Patent Office: 516 Days
• Field of Search: 428/99, 428/100, 428/900, 428/120, 24/451, 24/452
• US Class Current: 428/100
• CPC Class Codes: A44B 18/0049 obtained by moulding processes compression moulding or articles of indefinite length characterised by the shape of the surface B29C43/222; screen moulding B29C67/08
• CPC Class Codes: A44B 18/0076 Adaptations for being fixed to a moulded article during moulding
• CPC Class Codes: A44D 2203/00 Fastening by use of magnets
• CPC Class Codes: B29C 2043/465 having one or more cavities, e.g. for forming distinct products
• CPC Class Codes: B29C 33/16 using magnetic means
• CPC Class Codes: B29C 48/0014 producing flat articles having components brought in contact outside the extrusion die
• CPC Class Codes: B29C 48/07 Flat, e.g. panels
• CPC Class Codes: B29C 48/08 flexible, e.g. films
• CPC Class Codes: B29C 48/12 Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
• CPC Class Codes: B29C 48/13 Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
• CPC Class Codes: B29C 48/21 the layers being joined at their surfaces
• CPC Class Codes: B29C 48/355 Conveyors for extruded articles
• CPC Class Codes: B29L 2031/729 Hook and loop-type fasteners
• CPC Class Codes: Y10S 428/90 Magnetic feature
• CPC Class Codes: Y10T 24/27 including readily dissociable fastener having numerous, protruding, unitary filaments randomly interlocking with, and simultaneously moving towards, mating structure [e.g., hook-loop type fastener]
• CPC Class Codes: Y10T 24/2783 having filaments constructed from coated, laminated, or composite material
• CPC Class Codes: Y10T 24/2792 having mounting surface and filaments constructed from common piece of material
• CPC Class Codes: Y10T 428/24008 including fastener for attaching to external surface
• CPC Class Codes: Y10T 428/24017 Hook or barb
• CPC Class Codes: Y10T 428/24182 Inward from edge of web or sheet

Abstract

A fastening component of a separable fastener has some portion that is necessary for its fastening function, such as the hooks, the base to which the hooks are attached or a substrate that is used for another purpose, comprised of a magnetically attractive constituent. Another portion of the fastening component is comprised of a magnetically inert constituent. The fastening element may be the hook portion or the loop portion of a typical fastener. The fastening elements and the base may be unitary, or of different precursors, such as in a woven fastener component. The magnetically inert constituent may comprise a polymeric plastic or a thermoplastic elastomer. The magnetic attractant may impregnate the magnetically inert constituent, or it may coat or be coated by the magnetically inert constituent. The magnetic attractant may comprise a metal powder. The metal may be selected from the group consisting of iron powder. The magnetic attractant may be an organo-iron or a rare earth metal. In a woven fastener, either the base structure or the hooks may include the magnetic attractant, or both may do so. The material that forms the hooks may be entirely of a magnetically attractive material, with the material that forms the woven base being magnetically inert. Rather than the magnetically attractive material being incorporated into the fastening elements or the base, it may be incorporated into the substrate that is formed from a precursor element that is separate from the base, and that is joined to the base.

Claims

1. A method of making a component of a two component separable hook and loop fastener, said method comprising the steps of:

a. providing a magnetic attractant;

b. associating said magnetic attractant with a base and a plurality of fastening elements carried on said base, said fastening elements selected from the group consisting of loop elements and hook elements for use with a loop fastener; and

wherein said base and said fastening elements both comprise a magnetically inert constituent that is intimately associated throughout its entire volume with said magnetic attractant.

2. The method of claim 1, wherein said step of associating said magnetic attractant comprises the step of mixing a polymeric plastic resin with a magnetic attractant.

3. The method of claim 2, wherein said mixing step comprises the step of mixing said plastic resin with a magnetic attractant selected from the group consisting of iron, powder, magnetite iron oxide, hematite iron oxide, iron(II) oxide, iron (III) oxide, iron(III) stearate.

4. The method of claim 1, further comprising the step of joining said base to a substrate.

5. The method of claim 1, said step of associating said magnetic attractant with said base and said fastening elements comprising the step of forming said base and said fastening elements from the same constitutive materials.

6. The method of claim 1, said step of associating said magnetic attractant with said base and said fastening elements comprising the step of forming said base and said fastening elements unitarily from the same precursor element.

7. The method of claim 6, said step of forming said base and said fastening elements unitarily comprising the step of co-extruding said base and said fastening elements.

8. The method of claim 7, further comprising the steps of:

a. coextruding with said base and said fastening elements a substrate precursor element that is separate from said base; and

b. joining said precursor element to said base as a substrate.

9. The method of claim 1, further comprising the steps of:

a. forming a substrate precursor element that is separate from said base; and

b. joining said precursor element to said base as a substrate.

10. The method of claim 9, said step of forming said substrate comprising the step of coextruding said substrate with said base.

11. A method for making a molded article, said comprising the steps of:

a. making a component of a two component separable fastener according to the steps comprising;

i. providing a magnetic attractant;

ii. associating said magnetic attractant with a plurality of fastening elements carried on a base;

wherein said fastening elements comprise a magnetically inert constituent that is intimately associated with said magnetic attractant;

b. placing said separable fastener component into a mold, with said fastening face facing a wall of said mold, said mold comprising;

i. a fastening element receiving valley region; and

ii. a magnet inside a mold wall adjacent said fastening element receiving valley;

whereby said magnet attracts said fastener component toward said mold wall; and

c. providing molding material to said mold.

12. The method for making a molded article of claim 11, wherein said step of associating said magnetic attractant comprises the step of associating said magnetic attractant with said base.

13. The method for making a molded article of claim 11, wherein said step of associating said magnetic attractant comprises the step of mixing a polymeric plastic resin with a magnetic attractant.

14. The method for making a molded article of claim 13, wherein said mixing step comprises the step of mixing said plastic resin with a magnetic attractant selected from the group consisting of iron, powder, magnetite iron oxide, hematite iron oxide, iron(II) oxide, iron (III) oxide, iron(III) stearate.

15. The method for making a molded article of claim 11, further comprising the step of joining said base to a substrate.