A container is made in two stages from thermoplastics material. In the first stage a preform (1) is injection moulded, the mould parts easily releasing a tubular body (2) with a closed end and an outwardly projecting rim (3) at the open end. In the second stage the still heated preform (1) is blow m
A container is made in two stages from thermoplastics material. In the first stage a preform (1) is injection moulded, the mould parts easily releasing a tubular body (2) with a closed end and an outwardly projecting rim (3) at the open end. In the second stage the still heated preform (1) is blow moulded, possibly with some preliminary mechanical stretching, with the blow pin (13) seated in the open end of the body (2) and the preform (1) held by the other part (7) of its rim. The wall of the body (2) is expanded, and immediately below the open end it is stretched outwardly to meld with the underside of the inner part (5 ) of the rim. The resultant container thus has a mouth defined by an inset lip. It may be of paint tin form, with a drip groove (9) around the mouth.
대표청구항▼
What is claimed is: 1. A method of making a container to which entry is via an opening inset from adjacent container walling of said container, said opening being in a rim of said container, said method comprising the steps of: injection molding an embryo container in a heated condition from a mate
What is claimed is: 1. A method of making a container to which entry is via an opening inset from adjacent container walling of said container, said opening being in a rim of said container, said method comprising the steps of: injection molding an embryo container in a heated condition from a material susceptible to deformation when heated, said embryo container comprising a rim portion and a container-walling-forming portion, said rim portion having an upwardly-open channel formed intermediate an upstanding inner rib and a upwardly-stepped extension, said embryo container being molded in an injection mold including an inner mold core, said inner mold core being extractable through said opening, and said mold defining exterior surfaces of said rim portion of said embryo container in substantially the final form thereof; transferring said embryo container at an elevated temperature to a blow mold, said blow mold defining the required final external shape of said container walling to be formed by said container-walling-forming portion; inserting a blow pin into said opening, said blow pin being shaped to snugly fit said upwardly-open channel in said rim portion, said rim portion being snugly engaged by said blow mold and said blow pin, thereby cooling said rim portion of said embryo container, with said container-walling-forming portion of said embryo container being spaced from walls of said blow mold; stretching and expanding said container-walling-forming portion of said embryo container with blow molding into contact with said walls of said blow mold; and allowing said container to cool to set and removing said container from said blow mold. 2. A method as claimed in claim 1, wherein said stretching and expanding step includes mechanical stretching. 3. A method as claimed in claim 1, wherein said material is selected from the group consisting of polyethylene terephthalate (P.E.T.), polyethylene naphthalate (P.E.N.), and copolymers and blends thereof in both crystalline and amorphous form. 4. A method as claimed in claim 1, wherein said transferring step comprises transferring said embryo container while still hot from said injection molding step. 5. A method as claimed in claim 1, wherein in said blow mold said embryo container is supported by said rim portion. 6. A method as claimed in claim 1, wherein said blow mold defines a mold cavity having a mouth and in said blow mold said rim portion fits snugly in said mouth of said mold cavity. 7. A method as claimed in claim 1, further comprising the step of providing a press-in lid which is a press fit in said opening of said container, whereby said opening forms a seat for said press-in lid and said lid can be levered off using said extension as a fulcrum. 8. A container made by the method of claim 1. 9. A method of making a container to which entry is via an opening inset from adjacent container walling of said container, said opening being in a rim of said container, said method comprising the steps of: injection molding an embryo container in a heated condition from a material susceptible to deformation when heated, said embryo container comprising a rim portion and a container-walling-forming portion, said embryo container being molded in an injection mold including an inner mold core, said inner mold core being extractable through said opening, and said mold defining exterior surfaces of said rim portion of said embryo container in substantially the final form thereof; transferring said embryo container at an elevated temperature to a blow mold, said blow mold defining the required final external shape of said container walling to be formed by said container-walling-forming portion; inserting a blow pin into said opening, said rim portion being snugly engaged by said blow mold and said blow pin, thereby cooling said rim portion of said embryo container, with said container-walling-forming portion of said embryo container being spaced from walls of said blow mold; stretching and expanding said container-walling-forming portion of said embryo container with blow molding into contact with said walls of said blow mold; allowing said container to cool to set and removing said container from said blow mold; and providing a press-in lid which is a press fit in said opening of said container, whereby said opening forms a seat for said press-in lid and said lid can be levered off using said rim portion as a fulcrum. 10. A method of making a container to which entry is via an opening inset from adjacent container walling of said container, said opening being in a rim of said container, said method comprising the steps of: injection molding an embryo container in a heated condition from a material susceptible to deformation when heated, said embryo container comprising a rim portion and a container-walling-forming portion, and said mold defining exterior surfaces of said rim portion of said embryo container in substantially the final form thereof with said rim portion having an upwardly-open channel formed intermediate an upstanding inner rib and an upwardly-extending extension; transferring said embryo container at an elevated temperature to a blow mold, said blow mold defining the required final external shape of said container walling to be formed by said container-walling-forming portion; inserting a blow pin into said opening, said rim portion being snugly engaged by said blow mold and said blow pin, with said blow pin being shaped to snugly fit said upwardly-open channel in said rim portion, and with said container-walling-forming portion of said embryo container being spaced from walls of said blow mold; stretching and expanding said container-walling-forming portion of said embryo container with blow molding into contact with said walls of said blow mold; removing said container from said blow mold; and providing said container when cooled with a press-in lid adapted to be pressed into said opening, wherein said upwardly-extending extension of said rim portion can be utilized to provide a fulcrum for levering off said lid. 11. A method as claimed in claim 10, wherein said stretching and expanding step includes mechanical stretching. 12. A method as claimed in claim 10, wherein said material is selected from the group consisting of polyethylene terephthalate (P.E.T.), polyethylene naphthalate (P.E.N.), and copolymers and blends thereof in both crystalline and amorphous form. 13. A method as claimed in claim 10, wherein said transferring step comprises transferring said embryo container while still hot from said injection molding step. 14. A method as claimed in claim 10, wherein in said blow mold said embryo container is supported by said rim portion. 15. A method as claimed in claim 10, wherein said blow mold defines a mold cavity having a mouth and in said blow mold said rim portion fits snugly in said mouth of said mold cavity. 16. A container made by the method of claim 10. 17. A container-making apparatus for making a container to which entry is via an opening inset from adjacent container walling of the container, the opening being in a rim of the container, the apparatus comprising: an injection molding apparatus adapted to mold an embryo container comprising a rim portion having an opening therethrough and a container-walling-forming portion, the injection molding apparatus comprising a plurality of molding parts adapted to mold an exterior surface of the rim portion of the embryo container so that the rim portion has an upwardly-open channel formed between an upstanding inner rib and an upstanding outer wall; and a blow molding apparatus comprising: a plurality of parts which define a blow mold cavity, the cavity having a mouth; and a blow pin adapted to be inserted through the mouth of the blow mold cavity and retracted therefrom, the blow pin being adapted to expand the container-walling-forming portion of the embryo container so that the container walling substantially conforms to the blow mold cavity; wherein the blow molding apparatus is adapted to receive the embryo container in such a manner that the rim portion is engaged by the blow molding apparatus and the container-walling-forming portion does not initially contact the blow mold cavity defining parts; and wherein the blow pin is configured to mate with the upwardly-open channel in the rim portion. 18. Apparatus as claimed in claim 17, wherein said blow molding apparatus is adapted to provide mechanical stretching. 19. Apparatus as claimed in claim 17, wherein said blow molding apparatus supports said embryo container by said rim portion. 20. A container that resembles a tin and is formed of a material selected from the group consisting of polyethylene terephthalate (P.E.T.), polyethylene napthalate (P.E.N.), and copolymers and blends thereof in both crystalline and amorphous form, said container comprising: a rim having an upwardly-open channel formed intermediate an upstanding inner rib and an upstanding outer wall, said upstanding outer wall having a downwardly-extending outer flange having a lower edge, and said rim defining an opening for said container; a container body forming a one-piece construction with said rim and including container walling forming a side wall thereof, said opening of said container being inset from said container walling, and said container walling depending from said opening, expanding outwardly against said lower edge of said flange and being homogeneous with said lower edge of said flange, and then stepping out below said lower edge of said flange to form said container outer wall; and a lid which is a press fit in said opening of said container, whereby said lid can be levered off using said upstanding outer wall as a fulcrum. 21. A method of making a container in which entry is via an opening inset from adjacent container walling of said container, said opening being in a rim of said container, said method comprising the steps of: injection molding an embryo container in a heated condition from a material susceptible to deformation when heated, said embryo container comprising a bowl-like container-walling-forming portion integrally and monolithically joined at one end thereof to an outwardly protruding annular rim portion, said rim portion defining an opening therethrough which opens into the interior of said container-walling-forming portion, said embryo container being molded in an injection mold including an inner mold core which is extractable through said opening, and said injection mold defining exterior surfaces of said annular rim portion of said embryo container in substantially the final form thereof; removing the embryo container in its entirety from the injection mold and transferring the embryo container at an elevated temperature to a blow mold which has mold cavity walls defining the required final external shape of said container walling to be formed by said container-walling-forming portion; positioning said embryo container on said blow mold so that the annular rim portion is supportingly engaged by an upper portion of the blow mold and the container-walling-forming portion of the embryo container is suspended downwardly from the annular rim portion into a mold cavity defined by said walls; inserting a blow pin into said opening, and snugly engaging said annular rim portion between said blow mold and said blow pin, thereby cooling said rim portion of said embryo container, with said container-walling-forming portion of said embryo container being spaced from said mold cavity walls of said blow mold; stretching and expanding said container-walling-forming portion of said embryo container into contact with said mold cavity walls of said blow mold by blow molding into the interior of said container-walling-forming portion, while maintaining said annular rim portion snugly engaged by and between said blow mold and said blow pin; and allowing said container to set and removing said container from said blow mold. 22. A method as claimed in claim 21, wherein the annular rim portion has an upwardly-opening annular channel formed therein in outwardly spaced but surrounding relationship to said opening, and wherein said blow pin snugly seats in said channel simultaneously with positioning of the mold pin within said opening. 23. A method as claimed in claim 21, wherein said rim portion has an upwardly-facing annular surface formed thereon externally adjacent and in surrounding relationship to said opening, and said blow pin having an outer annular portion which is disposed in snug contacting engagement with said annular surface simultaneous with projection of a center portion of said blow pin into said opening. 24. A method as claimed in claim 21, wherein said rim portion is relatively flat in an axial direction thereof in comparison to a radial extent thereof, said rim portion having an annular flange fixedly and integrally associated therewith in surrounding relationship to but spaced radially outwardly a substantial extent from said opening, said annular flange projecting axially downwardly away from said rim portion so as to be positioned in radially spaced but surrounding relationship to an upper portion of said container-walling-forming portion, and wherein the stretching and expanding of the container-walling-forming portion within the blow mold cavity causes an upper portion of the container-walling-forming portion, in the vicinity of the rim portion, to be expanded radially outwardly into engagement with said axially-extending annular flange, with the remainder of the stretched and expanded container-walling-forming portion being expanded so as to effectively constitute an extension of said annular flange. 25. A container made by the method of claim 21. 26. A method of making a container in which entry is via an opening inset from adjacent container walling of said container, said opening being in a rim of said container, said method comprising the steps of: injection molding an embryo container in a heated condition from a material susceptible to deformation when heated, said embryo container comprising a bowl-like container-walling-forming portion integrally and monolithically joined at one end thereof to an outwardly protruding annular rim portion, said rim portion defining an opening therethrough which opens into the interior of said container-walling-forming portion, said embryo container being molded in an injection mold including an inner mold core which is extractable through said opening, and said injection mold defining exterior surfaces of said annular rim portion of said embryo container in substantially the final form thereof; removing the embryo container in its entirety from the injection mold and transferring the embryo container at an elevated temperature to a further mold which has mold cavity walls defining the required final external shape of said container walling to be formed by said container-walling-forming portion; positioning said embryo container on said further mold so that the annular rim portion is supportingly engaged by an upper portion of the further mold and the container-walling-forming portion of the embryo container is suspended downwardly from the annular rim portion into a mold cavity defined by said walls; inserting a mold pin into said opening, and snugly engaging said annular rim portion between said further mold and said mold pin, thereby cooling said rim portion of said embryo container, with said container-walling-forming portion of said embryo container being spaced from said mold cavity walls of said further mold; stretching and expanding said container-walling-forming portion of said embryo container into contact with said mold cavity walls of said further mold by pressure differential between the interior and exterior of said container-walling-forming portion, while maintaining said annular rim portion snugly engaged by and between said further mold and said mold pin; and allowing said container to set and removing said container from said further mold. 27. A method as claimed in claim 26, wherein said rim portion defines thereon an upwardly facing annular surface which is spaced radially outwardly from and surrounds said opening and is separated therefrom by an upwardly projecting annular rib associated with said rim portion, and said mold pin having a center portion which projects downwardly into said opening and a surrounding annular portion which is pressed into snug engagement with said annular surface to hold said rim portion in snug supportive engagement with said further mold. 28. A method as claimed in claim 26, wherein said rim portion is relatively flat in an axial direction thereof in comparison to a radial extent thereof, said rim portion having an annular flange fixedly and integrally associated therewith in surrounding relationship to but spaced radially outwardly a substantial extent from said opening, said annular flange projecting axially downwardly away from said rim portion so as to be positioned in radially spaced but surrounding relationship to an upper portion of said container-walling-forming portion, and wherein the stretching and expanding of the container-walling-forming portion within the mold cavity causes an upper portion of the container-walling-forming portion, in the vicinity of the rim portion, to be expanded radially outwardly into engagement with said axially-extending annular flange, with the remainder of the stretched and expanded container-walling-forming portion being expanded so as to effectively constitute an extension of said annular flange. 29. A method as claimed in claim 28, further comprising the step of providing a press-in lid which is a press fit in said opening of said container, whereby said opening forms a seat for said press-in lid and said lid can be levered off using said rim portion as a fulcrum. 30. A method as claimed in claim 26, further comprising the step of providing a press-in lid which is a press fit in said opening of said container, whereby said opening forms a seat for said press-in lid and said lid can be levered off using said rim portion as a fulcrum. 31. A container made by the method of claim 26. 32. A container structure that resembles a tin, comprising: a top rim having an upwardly-open annular channel formed intermediate an upstanding inner rib and an upstanding outer wall, said upstanding outer wall having a downwardly-extending outer flange having a lower edge, and said upstanding inner rib surrounding an opening extending through said rim for accessing an interior of a container body; said container body forming a one-piece construction with said rim and including container walling forming a side wall thereof, said opening in said rim being inset from said container walling, and said container walling depending from said opening, expanding outwardly against said lower edge of said flange and being homogeneous with said lower edge of said flange, and then stepping out below said lower edge of said flange to form an outer wall of said container body; said top rim and said container body defining a container which is a monolithic one-piece construction of a plastics material formed principally by molding; and a lid which has a press fit engagement with the upstanding inner rib for closing off said opening of said container.
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