Patent CA1150469A successfully refreshed from Google Patents.
CA1150469A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Containers for and containing carbonated beverages
Assignee: Plastona John Waddington Ltd
•
Filing: 1980-02-13
•
Granted: 1983-07-26
•
Expires: 2000-02-13
Abstract
Abstract ABSTRACT A method of forming plastics containers in quantity for plastics sheet, said containers being provided with top flanges by which the container tops maybe rim rolled sealed by metal lids. The plastics materials sheet is hot and annular regions are chilled to remove heat therefrom and leave hot circular regions which are formed into the individual containers. The chilling of the annular regions outwardly of where the cuts are made in the material to remove the thermoformed containers ensures that in the said top flanges the plastics material will be thinned down and radially orientated which inhibits cracking of the plastics material during seaming with the metal lids. The containers are specifically designed for holding carbonated beverage and specifically a plastics material is a polyester material, especially polyethylene terepthalate of high molecular weight.
Inventors
- 👤 Harold E. Taylor
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-08 18:15
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/26; B29C51/266; B29C51/268; B29C51/04; B29C51/42; B29C51/421; B29C51/422; B65; B65D; B65D1/00; B65D1/22; B65D1/26; B29C51/10; B29K; B29K2067/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
181 words
A method of producing thermoformed, circular sectioned and flanged top container which comprises providing a sheet of high molecular weight polyester material having an average mole-cular weight in the range of substantially 24,000 to 42,500 Mn heated to a sufficiently hot temperature to be thermoformed, clamp-ing an annular region of said sheet material at a temperature sufficiently low as to freeze said annular regions, leaving a dis-crete circular region of hot material to be thermoformed into a container within said annular region, locating said circular region in register with a circular sectioned mold cavity having a lesser diameter than the inner diameter of said annular region, thermoforming the container in said cavity including forming a flange at the top edge of the cavity between the upper edge of said cavity and the inner edge of said annular region, the sheet material forming said flange being radially orientated and reduced in thickness during said thermoforming to define the container and flange, and severing the container from the remainder of the sheet along a circular cut line defining the edge of said flange.
Claim 2
Independent Claim
181 words
A method of producing thermoformed, circular sectioned and flanged top container which comprises providing a sheet of high molecular weight polyester material having an average mole-cular weight in the range of substantially 24,000 to 42,500 Mn heated to a sufficiently hot temperature to be thermoformed, clamp-ing an annular region of said sheet material at a temperature sufficiently low as to freeze said annular regions, leaving a dis-crete circular region of hot material to be thermoformed into a container within said annular region, locating said circular region in register with a circular sectioned mold cavity having a lesser diameter than the inner diameter of said annular region, thermoforming the container in said cavity including forming a flange at the top edge of the cavity between the upper edge of said cavity and the inner edge of said annular region, the sheet material forming said flange being radially orientated and reduced in thickness during said thermoforming to define the container and flange, and severing the container from the remainder of the sheet along a circular cut line defining the edge of said flange.
Claim 3
Dependent Claim
37 words
A method as set forth in claim 1 wherein the sheet of polyester material has an initial predetermined thickness, and wherein the material of said flange is thinned to substantially 0.3 to 0.34 times said predetermined thickness.
Claim 4
Dependent Claim
32 words
A method as set forth in claim 1 wherein the radius of the inner diameter of said annular region is substantially 1.2 to 1.8 times the radius of said circular cut line.
Claim 5
Dependent Claim
32 words
A method as set forth in claim 2 wherein the radius of the inner diameter of said annular region is substantially 1.2 to 1.8 times the radius of said circular cut line.
Claim 6
Dependent Claim
29 words
A method as set forth in claim 1 comprising the further steps of placing a lid on said container, and rim-rolling the periphery of said lid with said flange,
Claim 7
Dependent Claim
13 words
A method as set forth in claim 5 wherein said lid is metal.
Claim 8
Dependent Claim
15 words
A method as set forth in claim 1 wherein said polyester material comprises polyethylene terephthalate.
Claim 9
Independent Claim
188 words
A method of producing a thermoformed, circular sectioned and flanged top container which comprises providing a sheet of polyester material heated to a sufficiently hot temperature to be thermoformed, clamping an annular region of said sheet material at a temperature sufficiently low as to freeze said annular region, leaving a discrete circular region of hot material to be thermo-formed into a container within said annular region, locating said circular region in register with a circular sectioned mold cavity having a lesser diameter than the inner diameter of said annular region, thermoforming the container in said cavity including forming a flange at the top edge of the cavity between the upper edge of said cavity and the inner edge of said annular region, the sheet material forming said flange being radially orientated and reduced in thickness during said thermoforming to define the container and flange! and severing the container from the remainder of the sheet along a circular cut line defining the edge of said flange, the radius of the inner diameter of said annular region being substantially 1.2 to 1,8 times the radius of said circular cut line.
Claim 10
Independent Claim
188 words
A method of producing a thermoformed, circular sectioned and flanged top container which comprises providing a sheet of polyester material heated to a sufficiently hot temperature to be thermoformed, clamping an annular region of said sheet material at a temperature sufficiently low as to freeze said annular region, leaving a discrete circular region of hot material to be thermo-formed into a container within said annular region, locating said circular region in register with a circular sectioned mold cavity having a lesser diameter than the inner diameter of said annular region, thermoforming the container in said cavity including forming a flange at the top edge of the cavity between the upper edge of said cavity and the inner edge of said annular region, the sheet material forming said flange being radially orientated and reduced in thickness during said thermoforming to define the container and flange! and severing the container from the remainder of the sheet along a circular cut line defining the edge of said flange, the radius of the inner diameter of said annular region being substantially 1.2 to 1,8 times the radius of said circular cut line.
Claim 11
Dependent Claim
29 words
A method as set forth in claim 8 comprising the further steps of placing a lid on said container, and rim-rolling the periphery of said lid with said flange.
Claim 12
Dependent Claim
13 words
A method as set forth in claim 9 wherein said lid is metal.
Claim 13
Independent Claim
189 words
A method of producing a thermoformed, circular sectioned and flanged top container which comprises providing a sheet of polyester material heated to a sufficiently hot temperature to be thermoformed, clamping an annular region of said sheet material at a temperature sufficiently low as to freeze said annular region, leaving a discrete circular region of hot material to be thermo-formed into a container within said annular region, locating said circular region in register with a circular sectioned mold cavity having a lesser diameter than the inner diameter of said annular region, thermoforming the container in said cavity including forming a flange at the top edge of the cavity between the upper edge of said cavity and the inner edge of said annular region, said upper edge of said cavity being spaced axially and radially of said annular region when the container is formed in said mold cavity, the sheet material forming said flange being radially orientated and reduced in thickness during said thermoforming to define the container and flange, and severing the container from the remainder of the sheet along a circular cut line defining the edge of said flange.
Claim 14
Independent Claim
189 words
A method of producing a thermoformed, circular sectioned and flanged top container which comprises providing a sheet of polyester material heated to a sufficiently hot temperature to be thermoformed, clamping an annular region of said sheet material at a temperature sufficiently low as to freeze said annular region, leaving a discrete circular region of hot material to be thermo-formed into a container within said annular region, locating said circular region in register with a circular sectioned mold cavity having a lesser diameter than the inner diameter of said annular region, thermoforming the container in said cavity including forming a flange at the top edge of the cavity between the upper edge of said cavity and the inner edge of said annular region, said upper edge of said cavity being spaced axially and radially of said annular region when the container is formed in said mold cavity, the sheet material forming said flange being radially orientated and reduced in thickness during said thermoforming to define the container and flange, and severing the container from the remainder of the sheet along a circular cut line defining the edge of said flange.
Claim 15
Dependent Claim
41 words
A method according to claim 11 wherein there is an annular shoulder between said annular region and the flange defin-ing region into which the material is deflected in order to effect stretching thereof and hence the said thinning and radial orient-ation.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.