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WO1999030894A1 - Improvements relating to containers having an integrated handle - Google Patents

Improvements relating to containers having an integrated handle Download PDF

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Publication number
WO1999030894A1
WO1999030894A1 PCT/GB1998/003745 GB9803745W WO9930894A1 WO 1999030894 A1 WO1999030894 A1 WO 1999030894A1 GB 9803745 W GB9803745 W GB 9803745W WO 9930894 A1 WO9930894 A1 WO 9930894A1
Authority
WO
WIPO (PCT)
Prior art keywords
jug
manufacturing
handle
preform
stage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB1998/003745
Other languages
French (fr)
Inventor
Charles Jonathan Britton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PCC TECHNOLOGIES PLC
Original Assignee
PCC TECHNOLOGIES PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB9726449.3A external-priority patent/GB9726449D0/en
Priority claimed from GBGB9804428.2A external-priority patent/GB9804428D0/en
Application filed by PCC TECHNOLOGIES PLC filed Critical PCC TECHNOLOGIES PLC
Priority to AU15700/99A priority Critical patent/AU1570099A/en
Publication of WO1999030894A1 publication Critical patent/WO1999030894A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/071—Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B29C2049/4879—Moulds characterised by mould configurations
    • B29C2049/4882—Mould cavity geometry
    • B29C2049/48825—Asymmetric moulds, i.e. the parison is not in the center of the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
    • B29C2949/0724—Preforms or parisons characterised by their configuration having variable wall thickness at body portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
    • B29C2949/0725—Preforms or parisons characterised by their configuration having variable wall thickness at bottom portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
    • B29C2949/0733—Preforms or parisons characterised by their configuration having variable diameter at body portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0761—Preforms or parisons characterised by their configuration characterised by the shape characterised by overall the shape
    • B29C2949/0763—Axially asymmetrical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/077—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/077—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
    • B29C2949/0772—Closure retaining means
    • B29C2949/0773—Threads
    • B29C2949/0775—Inner threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/0778—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the flange
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/078—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the bottom
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/079—Auxiliary parts or inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/079—Auxiliary parts or inserts
    • B29C2949/0791—Handle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/079—Auxiliary parts or inserts
    • B29C2949/0794—Dispensing spout
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/22—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at neck portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/24—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at flange portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/26—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at body portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/28—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at bottom portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/46—Knobs or handles, push-buttons, grips
    • B29L2031/463—Grips, handles

Definitions

  • the invention relates to containers and is particularly concerned with those having a handle, hereinafter referred to as jugs.
  • Jugs have quite a complex shape, and hitherto moulding them in one piece has been considered impossible, or at least just not economic in view of the elaboration of the mould. It is the aim of this invention to offer a practical way of making a one-piece jug.
  • a method of manufacturing a jug wherein, in a first stage, a preform is moulded as a closed end cup or tube with a mouth having a handle with a free end projecting therefrom, and wherein in a second stage, the preform is blow moulded in a mould into whose cavity said free end penetrates, the expansion of the cup or tube causing it to join to the free end of the handle.
  • the mouth is formed with a spout.
  • the mouth of the preform preferably has an outer peripheral portion from which the handle projects and which is held and remains unaltered during the blow moulding stage, and an inner portion in the form of a flange extending outwardly from the tube with a detent on its upper surface.
  • This flange can be transformed in the blow moulding stage into a throat with an interior detent, following the technique described in WO 97/19806.
  • the mouth may be formed in its ultimate shape in the first stage moulding, being unaltered by the blow moulding. In that case, if the mouth has an internal screw formation above that there will be a seat for a blow nozzle. That means that the blow nozzle does not have to screw into the workpiece .
  • the first stage will be injection moulding, and the injection mould can employ just two parts to form the mould cavity.
  • the blow moulding can be supplemented by preliminary mechanical stretching.
  • Figure 1 is an axial section of a preform from which a jug is to be blow moulded
  • Figure 2 is an elevation, looking in the direction A of Figure 1, of the preform
  • Figure 3 is plan view of the preform
  • Figure 4 is an elevation of the completed jug, corre- sponding to the view in direction A,
  • Figure 5 is a vertical section on the line V-V of Figure 4 .
  • Figure 6 is a vertical section on the line VI -VI of Figure 5
  • Figure 7 is a plan view of the jug
  • Figure 8 is an axial section of a jug preform
  • Figure 9 is an axial section of another jug preform.
  • the preform P of Figures 1 to 7 is an injection moulding of plastics material, its geometry being such that it can be produced by a two part mould. It has a tube 1 tapering gradually in towards its rounded closed bottom end 2, and this tube will be blow moulded to form the body of the jug. At the mouth of the tube 1 there is an outwardly projecting flange 3 with a downwardly projecting annular skirt 4 and an upwardly projecting rim 5 which is cylindrical apart from a spout 6. On top of the flange 3 there are two part spiral, diametrically opposed ribs 7, and at the point opposite the spout 6 there projects from the flange 3 and the rim 5 a handle 8. This is of simple inverted L- shape, with a T-shaped cross-section.
  • blow mould halves close together in the plane of Figure 5 with the lower end tip of the vertical leg of the handle 8 just within the cavity. These halves are shaped to make a sweeping indent 10 in the jug directly opposite the handle 8, to allow free finger access.
  • the tube 1 When the tube 1 expands it locally wraps itself around and welds to the tip of the handle 8, making that close the loop with the rest of the jug and thus making it stronger and more secure .
  • the body of the jug in this example is substantially square with rounded corners. It will be understood that many other shapes are equally possible, consistent with releasability from a blow mould cavity.
  • the tube 1 of the preform P may be shorter and be more appositely described as cu -like.
  • the preform of Figure 8 is similar in some respects to that of the previous figures. It has a closed end tube 11, tapering slightly inwards towards the base, a throat 12 with an internal screw thread 13, a stepped-out shoulder 14 above the throat and a generally cylindrical rim 15. The rim is locally deformed outwardly into a spout 16 and diametrically opposite that it has an L-shaped handle 17, the short leg 18 being radial to the rim and the long leg 19 projecting down parallel to the tube 11.
  • thermoplastic material preferably PET
  • Part of the mould therefore unscrews from the throat 12 when the preform has solidified.
  • this preform is blow moulded, the tube 11 (but not the throat, rim and handle) being pre-heated.
  • the blow nozzle seats on the shoulder 14 and penetrates a short distance into the throat 12, sealing against the slightly coned surface immediately below the turn of the shoulder 14.
  • the heated tube may be stretched longitudinally. When blown, the tube expands to meet the lower end of the leg 19 of the handle 17, which just penetrates and seals to the now-thin shell that is the main body of the jug. This final shape is indicated in broken lines .
  • the projecting spout 16 and the handle 17 are used to hold the preform firmly against the nozzle.

Landscapes

  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

A preform (P) of a jug is injection moulded to have a rim (5, 15) at the mouth of a cupped or tubular portion (1) and a handle (7, 17) with one end free projecting from the rim (5, 15). The preform is transferred to a blow mould which allows the free end (9, 19) of the handle (7, 17) to project into the cavity. On blow moulding, the rim (5, 15) and handle (7, 17) are held, while the remainder of the preform (P) expands to the final jug shape, meeting and welding to the free end (9, 19) of the handle to make that a closed loop with the side of the jug.

Description

I.MPROVEMENTS RELATING TO CONTAINERS HAVING AN INTEGRATED HANDLE
The invention relates to containers and is particularly concerned with those having a handle, hereinafter referred to as jugs. Jugs have quite a complex shape, and hitherto moulding them in one piece has been considered impossible, or at least just not economic in view of the elaboration of the mould. It is the aim of this invention to offer a practical way of making a one-piece jug. According to the present invention there is provided a method of manufacturing a jug wherein, in a first stage, a preform is moulded as a closed end cup or tube with a mouth having a handle with a free end projecting therefrom, and wherein in a second stage, the preform is blow moulded in a mould into whose cavity said free end penetrates, the expansion of the cup or tube causing it to join to the free end of the handle.
Preferably the mouth is formed with a spout.
The mouth of the preform preferably has an outer peripheral portion from which the handle projects and which is held and remains unaltered during the blow moulding stage, and an inner portion in the form of a flange extending outwardly from the tube with a detent on its upper surface. This flange can be transformed in the blow moulding stage into a throat with an interior detent, following the technique described in WO 97/19806.
However the mouth may be formed in its ultimate shape in the first stage moulding, being unaltered by the blow moulding. In that case, if the mouth has an internal screw formation above that there will be a seat for a blow nozzle. That means that the blow nozzle does not have to screw into the workpiece . Generally the first stage will be injection moulding, and the injection mould can employ just two parts to form the mould cavity.
The blow moulding can be supplemented by preliminary mechanical stretching.
For a better understanding of the invention, one embodiment will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is an axial section of a preform from which a jug is to be blow moulded,
Figure 2 is an elevation, looking in the direction A of Figure 1, of the preform,
Figure 3 is plan view of the preform,
Figure 4 is an elevation of the completed jug, corre- sponding to the view in direction A,
Figure 5 is a vertical section on the line V-V of Figure 4 ,
Figure 6 is a vertical section on the line VI -VI of Figure 5 , Figure 7 is a plan view of the jug,
Figure 8 is an axial section of a jug preform and
Figure 9 is an axial section of another jug preform.
The preform P of Figures 1 to 7 is an injection moulding of plastics material, its geometry being such that it can be produced by a two part mould. It has a tube 1 tapering gradually in towards its rounded closed bottom end 2, and this tube will be blow moulded to form the body of the jug. At the mouth of the tube 1 there is an outwardly projecting flange 3 with a downwardly projecting annular skirt 4 and an upwardly projecting rim 5 which is cylindrical apart from a spout 6. On top of the flange 3 there are two part spiral, diametrically opposed ribs 7, and at the point opposite the spout 6 there projects from the flange 3 and the rim 5 a handle 8. This is of simple inverted L- shape, with a T-shaped cross-section.
The injection moulding and the subsequent blow moulding, possibly pre-assisted by mechanical stretching, are carried out as described in WO 97/19806. This bends the flange 3 down and out against the skirt 4 and transforms the ribs 7 into portions of a screw thread on the inside of a cylindrical throat 9, as best seen in Figure 5. The rim 5, spout 6 and handle 8 remain unchanged and provide the anchorage for the jug as it is expanded to its final size and shape.
The blow mould halves close together in the plane of Figure 5 with the lower end tip of the vertical leg of the handle 8 just within the cavity. These halves are shaped to make a sweeping indent 10 in the jug directly opposite the handle 8, to allow free finger access.
When the tube 1 expands it locally wraps itself around and welds to the tip of the handle 8, making that close the loop with the rest of the jug and thus making it stronger and more secure .
As seen in Figure 7, the body of the jug in this example is substantially square with rounded corners. It will be understood that many other shapes are equally possible, consistent with releasability from a blow mould cavity. In particular, the tube 1 of the preform P may be shorter and be more appositely described as cu -like.
The preform of Figure 8 is similar in some respects to that of the previous figures. It has a closed end tube 11, tapering slightly inwards towards the base, a throat 12 with an internal screw thread 13, a stepped-out shoulder 14 above the throat and a generally cylindrical rim 15. The rim is locally deformed outwardly into a spout 16 and diametrically opposite that it has an L-shaped handle 17, the short leg 18 being radial to the rim and the long leg 19 projecting down parallel to the tube 11.
However this is injection moulded of thermoplastic material (preferably PET) in conventional fashion, the throat being in its ultimate form. Part of the mould therefore unscrews from the throat 12 when the preform has solidified.
In due course this preform is blow moulded, the tube 11 (but not the throat, rim and handle) being pre-heated. The blow nozzle seats on the shoulder 14 and penetrates a short distance into the throat 12, sealing against the slightly coned surface immediately below the turn of the shoulder 14. Before air is injected, the heated tube may be stretched longitudinally. When blown, the tube expands to meet the lower end of the leg 19 of the handle 17, which just penetrates and seals to the now-thin shell that is the main body of the jug. This final shape is indicated in broken lines . During this blow moulding the projecting spout 16 and the handle 17 are used to hold the preform firmly against the nozzle.
The preform of Figure 9 is very similar except that instead of the almost right angled shoulder 14 there is a coned surface 20 (with a more pronounced angle compared with that of the surface below the shoulder 14) against which the blow nozzle will seal.

Claims

Claims
1. A method of manufacturing a jug wherein, in a first stage, a preform is moulded as a closed end cup or tube with a mouth having a handle with a free end projecting therefrom, and wherein, in a second stage, the preform is blow moulded in a mould into whose cavity said free end penetrates, the expansion of the cup or tube causing it to join to the free end of the handle.
2. A method of manufacturing a jug as claimed in claim 1, wherein the mouth is formed with a spout.
3. A method of manufacturing a jug as claimed in claim 1 or 2, wherein the mouth of the preform has an outer peripheral portion from which the handle projects and which is held and remains unaltered during the blow moulding stage, and an inner portion in the form of a flange extending outwardly from the tube with a detent on its upper surface, this flange being transformed in the blow moulding stage into a throat with an interior detent .
4. A method of manufacturing a jug as claimed in claim 1 or 2 , wherein the mouth is formed in its ultimate shape in the first stage moulding and is unaltered by the blow moulding.
5. A method of manufacturing a jug as claimed in claim 4, wherein the mouth has an internal screw formation and above that a seat for a blow nozzle.
6. A method of manufacturing a jug as claimed in any preceding claim, wherein the first stage is injection moulding.
7. A method of manufacturing a jug as claimed in claim 6, wherein the injection mould employs just two parts to form the mould cavity.
8. A method of manufacturing a jug as claimed in any preceding claim, when the blow moulding is supplemented by preliminary mechanical stretching.
PCT/GB1998/003745 1997-12-13 1998-12-14 Improvements relating to containers having an integrated handle Ceased WO1999030894A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU15700/99A AU1570099A (en) 1997-12-13 1998-12-14 Improvements relating to containers having an integrated handle

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9726449.3 1997-12-13
GBGB9726449.3A GB9726449D0 (en) 1997-12-16 1997-12-16 Improvements relating to containers
GBGB9804428.2A GB9804428D0 (en) 1998-03-04 1998-03-04 Improvements relating to containers
GB9804428.2 1998-03-04

Publications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001012515A1 (en) * 1999-08-16 2001-02-22 Tjandra Limanjaya P.e.t. bottle with side handle and its manufacturing method
WO2008062183A3 (en) * 2006-11-22 2008-08-21 Plastic Can Company Ltd An injection-moulded preform for use in making a container, and a method and apparatus for making a container with a handle

Citations (5)

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Publication number Priority date Publication date Assignee Title
US4372454A (en) * 1979-04-10 1983-02-08 Thompson Mortimer S Blow molded container with handle
JPH0390331A (en) * 1989-09-01 1991-04-16 Nissei Ee S B Kikai Kk Thin-walled synthetic resin container with handle and method for manufacturing the same
WO1996030189A1 (en) * 1995-03-31 1996-10-03 Carter Holt Harvey Limited Blow-moulding handled containers in pet or like plastics and related preforms, methods and apparatus
WO1996033063A1 (en) * 1995-04-20 1996-10-24 Glenn Robert Beale Container with integral handle, preform and method of manufacture
WO1997019806A1 (en) * 1995-11-30 1997-06-05 Charles Jonathan Britton Improvements relating to containers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4372454A (en) * 1979-04-10 1983-02-08 Thompson Mortimer S Blow molded container with handle
JPH0390331A (en) * 1989-09-01 1991-04-16 Nissei Ee S B Kikai Kk Thin-walled synthetic resin container with handle and method for manufacturing the same
WO1996030189A1 (en) * 1995-03-31 1996-10-03 Carter Holt Harvey Limited Blow-moulding handled containers in pet or like plastics and related preforms, methods and apparatus
WO1996033063A1 (en) * 1995-04-20 1996-10-24 Glenn Robert Beale Container with integral handle, preform and method of manufacture
WO1997019806A1 (en) * 1995-11-30 1997-06-05 Charles Jonathan Britton Improvements relating to containers

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Title
PATENT ABSTRACTS OF JAPAN vol. 015, no. 267 (M - 1133) 8 July 1991 (1991-07-08) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001012515A1 (en) * 1999-08-16 2001-02-22 Tjandra Limanjaya P.e.t. bottle with side handle and its manufacturing method
WO2008062183A3 (en) * 2006-11-22 2008-08-21 Plastic Can Company Ltd An injection-moulded preform for use in making a container, and a method and apparatus for making a container with a handle

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