Continuous production of molded plastic containers

• US 7,052,644 B2
• Filed: 11/17/2003
• Issued: 05/30/2006
• Est. Priority Date: 11/17/2003
• Status: Active Grant

• Current Assignee: Graham Packaging Company LP (Graeme Richard Hart, MBA)
• Original Assignee: Graham Packaging Company LP (Graeme Richard Hart, MBA)
• Inventors: Larsen, W. Bruce
• Primary Examiner(s): Davis, Robert B.
• Application Number:
  US10/716,229
• Publication Number:
  US 20050104263A1
• Time in Patent Office: 925 Days
• Field of Search: 425/528, 425/534, 264/531, 264/532, 264/543
• US Class Current: 264/531
• CPC Class Codes: B29B 11/12 Compression moulding
• CPC Class Codes: B29C 2043/3277 for rotatable suports, e.g. carousels, drums
• CPC Class Codes: B29C 2043/5833 movement of moulds or mould parts, e.g. opening or closing, actuating
• CPC Class Codes: B29C 2049/78805 Computer or PLC control
• CPC Class Codes: B29C 2793/0081 before shaping
• CPC Class Codes: B29C 2949/22 at neck portion
• CPC Class Codes: B29C 2949/24 at flange portion
• CPC Class Codes: B29C 2949/26 at body portion
• CPC Class Codes: B29C 2949/28 at bottom portion
• CPC Class Codes: B29C 2949/3008 at neck portion
• CPC Class Codes: B29C 2949/3012 at flange portion
• CPC Class Codes: B29C 2949/3016 at body portion
• CPC Class Codes: B29C 2949/302 at bottom portion
• CPC Class Codes: B29C 2949/3024 characterised by the number of components or by the manufacturing technique
• CPC Class Codes: B29C 2949/3026 having two or more components
• CPC Class Codes: B29C 2949/3028 having three or more components
• CPC Class Codes: B29C 2949/303 having more than three components
• CPC Class Codes: B29C 2949/3056 having components being compression moulded
• CPC Class Codes: B29C 2949/3058 having two or more components being compression moulded
• CPC Class Codes: B29C 2949/306 having three or more components being compression moulded
• CPC Class Codes: B29C 2949/3062 : having more than three components being compression moulded
• CPC Class Codes: B29C 31/048 : the material being severed at the dispensing head exit, e.g. as ring, drop or gob, and transported immediately into the mould, e.g. by gravity
• CPC Class Codes: B29C 43/00 : Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor by liberation of internal stresses B29C61/006
• CPC Class Codes: B29C 43/08 : with circular movement , e.g. mounted on rolls, turntables
• CPC Class Codes: B29C 43/58 : Measuring, controlling or regulating for bank adjustment in calendering B29C43/245
• CPC Class Codes: B29C 48/07 : Flat, e.g. panels
• CPC Class Codes: B29C 48/21 : the layers being joined at their surfaces
• CPC Class Codes: B29C 48/49 : using two or more extruders to feed one die or nozzle
• CPC Class Codes: B29C 49/02 : Combined blow-moulding and manufacture of the preform or the parison
• CPC Class Codes: B29C 49/0685 : Compression blow-moulding
• CPC Class Codes: B29C 49/22 : using multilayered preforms or parisons
• CPC Class Codes: B29C 49/24 : Lining or labelling
• CPC Class Codes: B29C 49/36 : rotatable about one axis
• CPC Class Codes: B29C 49/42101 : Conveyors, e.g. flat conveyor or clamping between two bands
• CPC Class Codes: B29C 49/6409 : Thermal conditioning of preforms B29C49/68 takes precedence
• CPC Class Codes: B29C 49/6436 : characterised by temperature differential
• CPC Class Codes: B29C 49/78 : Measuring, controlling or regulating
• CPC Class Codes: B29K 2023/00 : Use of polyalkenes or derivatives thereof as moulding material
• CPC Class Codes: B29K 2023/086 : EVOH, i.e. ethylene vinyl alcohol copolymer
• CPC Class Codes: B29K 2067/00 : Use of polyesters or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2995/0041 : Crystalline
• CPC Class Codes: B29K 2995/0067 : non-permeable
• CPC Class Codes: B29L 2031/712 : Containers; Packaging elements or accessories, Packages closures therefor B29L2031/56; ink or toner cartridges B29L2031/7678; squeeze tubes B29L2023/20; suitcases B29L2031/7418

Abstract

A system for making plastic containers includes a source for providing a continuous stream of molten plastic, and a cutter for severing a continuing series of individual mold charges from the continuous molten plastic stream. A compression molder includes a plurality of compression molds arranged in a continuing series for receiving the mold charges in sequence and compression molding the mold charges into a continuing series of individual plastic container preforms. A blow molder includes a plurality of blow molds arranged in a continuing series for receiving the individual plastic container preforms in sequence and blow molding the preforms into a continuing series of plastic containers. A common drive coordinates continuous and synchronous operation of the molten plastic source, the cutter, the compression molder and the blow molder to provide the continuing series of plastic containers from the continuous stream of molten plastic.

Claims

1. A system for making plastic containers, which includes:

a source for providing a continuous stream of molten plastic,

a cutter coupled to said source for severing a continuing series of individual mold charges from said continuous stream,

a compression molder including a plurality of compression molds arranged in a continuous series for receiving said mold charges in sequence and compression molding said mold charges into a continuing series of individual plastic container preforms,

a blow molder including a plurality of blow molds arranged in a continuing series for receiving said individual plastic container preforms in sequence and blow molding said preforms into a continuing series of plastic containers, and

a common drive for coordinating continuous and synchronous operation of said source, said cutter, said compression molder and said blow molder.

2. The system set forth in claim 1 further including a preform conditioner coupled to said common drive and connected between said compression molder and said blow molder for conditioning preforms from said compression molder preparatory to blow molding in said blow molder.

3. The system set forth in claim 2 further including a conveyor coupled to said common drive and connected to said blow molder for receiving said continuing series of plastic containers from said blow molder.

4. The system set forth in claim 1 wherein said source includes an extruder.

5. A method of making plastic containers, which includes the steps of:

(a) providing a continuous stream of molten plastic,

(b) cutting said continuous stream into individual mold charges,

(c) transferring said mold charges in sequence to a continuing series of compression molds,

(d) compression molding a continuing series of plastic container preforms in said compression molds,

(e) transferring said continuing series of plastic container preforms in sequence to a continuing series of blow molds,

(f) blow molding a continuing series of plastic containers in said blow molds,

(g) removing said containers in sequence from said blow molds, and

(h) operating said step (a) through (g) in synchronism to provide a continuing series of blow molded containers from said molten plastic stream.

6. The method set forth in claim 5 wherein said step (e) includes conditioning said plastic container preforms preparatory to blow molding in said step (f).

7. The method set forth in claim 5 that includes at least one step, prior to said step (e) or subsequent to said step (g), selected from the group consisting of:

crystallizing all or a portion of the finish of the preform or container, and attaching all or a portion of a finish to the preform or container.

8. The method set forth in claim 5 that includes the step of attaching a label to the container during or subsequent to said step (f).

9. A system for making plastic containers, which includes:

a source for providing a continuous stream of molten plastic,

a preform molder for molding said plastic into a continuing series of individual plastic container preforms,

a blow molder including a plurality of blow molds arranged in a continuing series for receiving said individual plastic container preforms in sequence and blow molding said preforms into a continuing series of plastic containers, and

a common drive for coordinating continuous and synchronous operation of said source, said preform molder and said blow molder.

10. A method of making plastic containers, which includes the steps of:

(a) providing a continuous stream of molten plastic,

(b) molding a continuing series of plastic container preforms,

(c) transferring said continuing series of plastic container preforms in sequence to a continuing series of blow molds,

(d) blow molding a continuing series of plastic containers in said blow molds,

(e) removing said containers in sequence from said blow molds, and

(f) operating said step (a) through (e) in synchronism to provide a continuing series of blow molded containers from said molten plastic stream.