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Application US20190135500
Published 2019-05-09
Method For Manufacturing A Closure For A Product-retaining Container
A method for manufacturing a closure constructed for being inserted and securely retained in a portal-forming neck of a product-retaining container is provided. Such method may include intimately combining a plurality of particles comprising cork and having a specified particle size distribution with a plastic material including one or more thermoplastic polymers, optionally in combination with other constituent(s) to form a composition, heating the composition to form a melt, extruding or molding a closure precursor from the melt to provide a specified water content range, and optionally cutting and/or finishing the closure precursor. A composition for use in manufacturing a closure for a product-retaining container includes a plurality of particles comprising cork and having a specified particle size distribution with a plastic material including one or more thermoplastic polymer, optionally in combination with other constituent(s). Methods for producing particulate material, cork composite material, and additional methods for producing closures are also provided.
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- 1. A method for manufacturing a closure for a product-retaining container constructed for being inserted and securely retained in a portal-forming neck of said container, said method comprising at least the following method steps:
i. intimately combining the following components, to form a composition:
(a) 51 to 80 wt. % (dry weight) or 51 to 85 wt. % of a plurality of particles comprising cork and having a particle size distribution D50 measured by means of mechanical sieving according to ISO ICS 19.120 and in particular ISO 2591-1:1988, in the range of from 0.25 millimetres to 5 millimetres;
(b) 12 to 49 wt. % of a plastic material comprising one or more thermoplastic polymers;
(c) optionally, 0 to 10 wt. % of one or more blowing agents;
(d) optionally, 0 to 15 wt. % of one or more lubricants;
(e) optionally, 0 to 2 wt. % of one or more pigments; and
(f) optionally, 0 to 10 wt. % of one or more additives and/or fillers;
ii. heating the composition obtained in step i. to form a melt; iii. forming, by means of extrusion or molding, a closure precursor from the melt obtained in step ii, wherein the plurality of particles comprising cork in the closure precursor have a water content of less than 3 wt. %; iv. optionally cutting and/or finishing the closure precursor to form the closure.
- 3. (canceled)
- 51. A composition for use in manufacturing a closure for a product-retaining container, comprising as components:
(a) 51 to 80 wt. % (dry weight), or 51 to 85 wt. %, of a plurality of particles comprising cork and having a particle size distribution D50 measured by means of mechanical sieving according to ISO ICS 19.120 and in particular ISO 2591-1:1988, in the range of from 0,5 millimetres to 3 millimetres; (b) 12 to 49 wt. % of a plastic material comprising one or more thermoplastic polymers; (c) optionally, 0 to 10 wt. % of one or more blowing agents; (d) optionally, 0 to 15 wt. % of one or more lubricants; (e) optionally, 0 to 2 wt. % of one or more pigments; and (f) optionally, 0 to 10 wt. % of one or more additives and/or fillers
- 57. (canceled)
- 58. (canceled)
