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Patent US10183786
Issued 2019-01-22
Closure For A Product-retaining Container
The disclosure relates to a cylindrical closure for a product-retaining container constructed for being inserted and securely retained in a portal-forming neck of said container, said closure comprising at least one thermoplastic polymer and at least one natural organic filler wherein the lateral surface of said closure has a hardness of 40 to 90 Shore A. Such closures are particularly suitable for sealingly closing wine bottles.
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- 1. A cylindrical closure for a product-retaining container constructed for being inserted and securely retained in a portal-forming neck of said container, said closure comprising at least one thermoplastic polymer at least one natural organic filler, a plurality of cells, and a lateral surface, wherein the plurality of cells comprises a cell size in a range from 0.025 mm to 0.5 mm, and said closure comprises at least one of the following features (a) or (b):
(a) the lateral surface has a hardness in a range from 40 to 90 Shore A, according to ASTM D2240-10; and (b) the lateral surface has a dynamic coefficient of friction in a range from 0.35 to 0.7, according to ASTM D1894-14.
- 54. A method for producing a cylindrical closure, the method comprising the steps of
a. combining at least one natural organic filler with at least one thermoplastic polymer to obtain a polymer composition, wherein the at least one natural organic filler comprises at least one of the following features (i) or (ii):
(i) the at least one natural organic filler comprises particles having a particle size measured by a laser diffraction method according to ISO 13320 in a range from 0.1 μm to 2000 μm, or
(ii) the at least one natural organic filler comprises at least one ingredient selected from the group consisting of grape seed flour, grape skin powder, grape pomace flour, rice hull flour, oat hull flour, peanut hull flour, soybean hull flour, starch flour, corn starch flour, cellulose flour, microcrystalline cellulose, nanocellulose, wood flour, rice straw flour, corn cob flour, cricket flour, bagasse flour, kenaf flour, and hemp flour;
b. adding at least one blowing agent to the polymer composition; c. heating the polymer composition provided in step b. to obtain a heated composition; d. introducing the heated composition into a mold; e. forming the closure inside the mold; and f. demolding the closure.
- 56. A method for producing a cylindrical closure comprising at least one thermoplastic polymer and at least one natural organic filler, said method comprising the steps of:
a. providing a core member composition comprising at least one thermoplastic polymer; b. adding the at least one natural organic filler to the core member composition wherein the at least one natural organic filler comprises at least one of the following features (i) or (ii):
(i) the at least one natural organic filler comprises particles having a particle size measured by a laser diffraction method according to ISO 13320 in a range from 0.1 μm to 2000 μm, or
(ii) the at least one natural organic filler comprises at least one ingredient selected from the group consisting of grape seed flour, grape skin powder, grape pomace flour, rice hull flour, oat hull flour, peanut hull flour, soybean hull flour, starch flour, corn starch flour, cellulose flour, microcrystalline cellulose, nanocellulose, wood flour, rice straw flour, corn cob flour, cricket flour, bagasse flour, kenaf flour, and hemp flour;
c. adding at least one blowing agent to the core member composition; d. heating the core member composition to obtain a heated composition; e. extruding a continuous, elongated, substantially cylindrically shaped length of the heated composition to obtain, as a core member, a continuous elongated length of the core member composition having a cylindrical surface; f. cutting the continuous elongated length of the core member composition obtained in method step e. in a plane substantially perpendicular to a central axis of said continuous elongated length to obtain the closure.
- 62. A method for producing a cylindrical closure comprising at least one thermoplastic polymer and at least one natural organic filler, said method comprising the steps of:
a. providing a core member composition comprising at least one thermoplastic polymer; b. adding at least one blowing agent to the core member composition; c. heating the core member composition to obtain a heated composition; d. extruding a continuous, elongated, substantially cylindrically shaped length of the heated composition to obtain, as a core member, a continuous elongated length of the core member composition having a cylindrical surface; e. providing a peripheral layer composition comprising at least one thermoplastic polymer; f. extruding a separate and independent peripheral layer of the peripheral layer composition separately to, co-axially to and in intimate bonded engagement with the continuous, elongated length of the core member composition obtained in method step d., said separate and independent peripheral layer peripherally surrounding and substantially enveloping the cylindrical surface of the continuous, elongated length of the core member composition obtained in method step d. to obtain a multi-component elongated structure having a cylindrical surface; and g. cutting the multi-component elongated structure obtained in method step f. in a plane substantially perpendicular to a central axis of said multi-component elongated structure to obtain the closure.
