GB2185708A - Positioning inserts in moulds - Google Patents

Positioning inserts in moulds Download PDF

Info

Publication number
GB2185708A
GB2185708A GB08601600A GB8601600A GB2185708A GB 2185708 A GB2185708 A GB 2185708A GB 08601600 A GB08601600 A GB 08601600A GB 8601600 A GB8601600 A GB 8601600A GB 2185708 A GB2185708 A GB 2185708A
Authority
GB
United Kingdom
Prior art keywords
mould
blank
hole
sprue bush
neck portion
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.)
Granted
Application number
GB08601600A
Other versions
GB8601600D0 (en
GB2185708B (en
Inventor
Rudolf Gladys
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.)
Cerbo AB
Original Assignee
Cerbo AB
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
Application filed by Cerbo AB filed Critical Cerbo AB
Priority to GB8601600A priority Critical patent/GB2185708B/en
Publication of GB8601600D0 publication Critical patent/GB8601600D0/en
Priority to IN17/DEL/87A priority patent/IN169186B/en
Priority to KR1019870000167A priority patent/KR920009941B1/en
Priority to MYPI87000038A priority patent/MY101137A/en
Priority to BG78115A priority patent/BG49269A3/en
Priority to SU874028916A priority patent/SU1500146A3/en
Priority to HU87194A priority patent/HU202144B/en
Priority to DD87299433A priority patent/DD256672A5/en
Priority to CN87100576A priority patent/CN1009904B/en
Publication of GB2185708A publication Critical patent/GB2185708A/en
Application granted granted Critical
Publication of GB2185708B publication Critical patent/GB2185708B/en
Priority to HK198/90A priority patent/HK19890A/en
Expired 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14065—Positioning or centering articles in 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C2045/1486—Details, accessories and auxiliary operations
    • B29C2045/14901—Coating a sheet-like insert smaller than the dimensions of the adjacent mould wall
    • B29C2045/14918—Coating a sheet-like insert smaller than the dimensions of the adjacent mould wall in-mould-labelling
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C2045/1486—Details, accessories and auxiliary operations
    • B29C2045/14967—Injecting through an opening of the insert
    • B29C2045/14975—Injecting through an opening of the insert the injection nozzle penetrating through the insert

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

A mould for injection moulding thermoplastics objects comprises two halves (1,2) forming one or more moulding cavities, each of which is equipped with a sprue bush (3) for the moulding composition. The cavity is adapted to accommodate a sheet of material (4), which is supplied to the open mould and kept located on the mould half (1) during the closing movement of the mould. The sheet of material has a hole (5) through which the moulding composition is injected for urging the sheet into engagement with the other mould half (2). The sprue bush is formed with a neck portion (7) dimensioned such that when the mould is closed the neck projects through the hole (5) in the sheet of material for positioning the latter. <IMAGE>

Description

SPECIFICATION Mould for injection moulding The invention relates to a mould disposedforthe injection moulding of cans or other objects made from thermoplastic material, and comprising two mould halveswhich,whentheyare mounted in an injection moulding machine, are mutually, reciprocally movable such as to form in one end position one or more mould cavities, each provided with a sprue bush for moulding composition. Each cavity is adapted to accommodate a sheet of material, serving for example as a label, and hereinafter called a "blank". The blank is supplied to the opened mould and is located, e.g. by suction slits, to one mould half during the closing movement ofthe mould.The blanks are ofthe kind having a hole through which moulding composition is injected via the sprue bush on the other mould half, thus causing the blankto be urged against this half by the composition. The cavity is arranged for being supplied with a newblankduringeachworkcyclefor attaching the blank to the object.
Such a mould is already known, e.g. from the British patent specification 1 456036, which inter alia shows how a can may be provided with a blank on its outside during injection moulding, by the injected composition passing through the hole in the blank and from the half carrying the blank towards the other half forthus filling the cavity. In the injection moulding of objects provided with a blankwhich is noticeably unsymmetrical in relation to the hole therein,there occur non-uniformly distributed frictional forces.Retaining forces between the blank and its retaining mould half as well as entraining forces between the blank and the composition moving at high velocity may differ considerably in various directions round the hole, resulting in that the blank does not assume its correct position on the can, thus risking rejection ofthefinished article.
The object of the present invention is thus to provide a mould in which the blank is effectively secured against gliding movement in its plane during injection ofthe moulding composition.
The desired result is obtained by the sprue bush, mentioned in the introduction, being formed with a neck portion which, when the mould is closed, is dimensioned such asto project through the hole in the blankfor correctly locating the blank by engagement between the neck portion and at least part of the periphery ofthe hole.
One embodiment of the invention is described in detail in the following, with reference to the accompanying drawing, where small portions of the mould halves are illustrated in longitudinal section in the region of the cavitysprue bush. In the section the halves are shown slightly spaced in relation to their closed end position.
The mould, comprising mould halves 1 and 2, is disposed for the injection moulding of cans or other objects made from thermoplastic material. Apart from the sprue bush 3 in mould half 2,the halves may be conventionally implemented, with one or more mould cavities each equipped with the inventive sprue bush. The figure on the drawing only shows a small region round the sprue bush in such a cavity. The half 1 may be assumed to be the male half, and half 2 the female half. Both halves are intended to be mutually reciprocally movable in a conventional manner in an injection moulding machine (unillustrated).The cavity is adapted to receive a blank 4, which is supplied to the completely open mould and located on the male half 1 during the closing movement of the mould, with the aid of such as (unillustrated) suction slits. The blank is of the kind with a hole 5, through which the moulding composition passes from the gate 6 on the sprue bush3forguidingthe blankfromengagement against the male half 1 into engagement against the female half 2. The blanks may be supplied to the cavity or cavities in a manner such is indicated in the mentioned British patent specification 1 456 036, or theAustralian specification S35895ortheSwedish specification 8103608-9 (publication No.426668).
When the mould 1,2 is closed, the portions ofthe blank extending outside the front surface of the male half 1 are folded into engagement with the side surfaces ofthe male half in a manner already known, e.g. from the British patent specification 1 456036. If the object to be produced, and thereby the mould half, has a complicated configuration, the blank may often need to have greatly varying extension in different directions from the hole 5. This may result in the occurrance of greatly varying forces during the injection ofthe moulding compound.
While the composition is injected in the inventive mould, the blank is positively retained in its correct position, by the bush 3 being formed with a neck portion projecting into the hole Sin the blank 4when the mould is completely closed.
The neck portion 7 can be made very short, by retaining the configuration of the region round the cavity gate 6 illustrated in the british patent 1 456 036.
The sprue bush accordingly has a convex section towards the cavity, resulting from a configuration which is substantially spherical segmental, with the gate 6 at its centre, while an opposing portion of the half 1 is complementally, convexedly shaped. The blank4, lying against the otherwise planarfront surface ofthe half 1 (the blank being shown somewhat spaced from this surface for the sake of clarity on the drawing) will already be lightly pressed against the nose portion ofthe sprue bush before the mould is completely closed. The small neck length required for the sprue bush to obtain locating engagementwiththe hole Sintheblank4may therefore be achieved by planing offanannulararea concentric with the gate 6. This interference with the flow path of the moulding composition, where this path has been carefully determined from the aspect offlowtechnology, does not need to cause, due to the short neck, any production problems due to disturbed flow in the injection moulding process, although effective, positive location of the blank has been obtained by the engagement between the neck portion 7 and the edge ofthe hole 5.
The neck portion 7 has essentially circular-cylindrical shape. Its diameter is substantially less than that of the hole 5 and is suitably about 50 - 90% of the hole diameter.

Claims (3)

1. Mould disposedforthe injection moulding of cans or other objects made from thermoplastic material, and comprising two mould halves which, when they are mounted in an injection moulding machine, are mutually, reciprocally movable such as to form in one end position one or more mould cavities, each provided with a sprue bush (3) forthe moulding composition, the cavity or cavities being adapted for accommodating a sheet of material serving for example as a label, and hereinafter called a blank", which is supplied to the open mould, and is kept located by such as suction slits to one mould half (1) when the mould is closed, the blanks being of the kind having a hole (5)through which moulding composition is injected via the sprue bush (3) on the other mould half(2), thus causing the blank to be urged against this half by the composition, the cavity also being arranged for being supplied with a new blank during each work cycle for attachment to the object produced in the injection moulding process, characterized in thatthe sprue bush (3) is formed with a neck portion (7) dimensioned such that when the mould (1,2) is closed it projects through the hole (5) in the blank (4) to keep the blank correctly located by engagement between the neck portion (7) and the edge of the hole (5).
2. Mould as claimed in claim 1, characterized in that the neck portion (7) has essentially circular-cylindrical configuration and has substantially less diameterthan the hole (5) in the blank (4), preferably a diameter of 50 - 90 % of that of the hole (5).
3. A mould, substantially as herein described with reference to the accompanying drawing.
GB8601600A 1986-01-23 1986-01-23 Mould for injection moulding Expired GB2185708B (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
GB8601600A GB2185708B (en) 1986-01-23 1986-01-23 Mould for injection moulding
IN17/DEL/87A IN169186B (en) 1986-01-23 1987-01-07
KR1019870000167A KR920009941B1 (en) 1986-01-23 1987-01-12 Mould for injection moulding
MYPI87000038A MY101137A (en) 1986-01-23 1987-01-16 Mould for injection moulding.
BG78115A BG49269A3 (en) 1986-01-23 1987-01-20 Casting mould under pressure of products from thermoplastic material
SU874028916A SU1500146A3 (en) 1986-01-23 1987-01-22 Mould for die-casting
HU87194A HU202144B (en) 1986-01-23 1987-01-22 Mould for die casting
DD87299433A DD256672A5 (en) 1986-01-23 1987-01-23 DEVICE FOR INJECTION MOLDING
CN87100576A CN1009904B (en) 1986-01-23 1987-01-23 Mould for injection on moulding
HK198/90A HK19890A (en) 1986-01-23 1990-03-15 Mould for injection moulding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8601600A GB2185708B (en) 1986-01-23 1986-01-23 Mould for injection moulding

Publications (3)

Publication Number Publication Date
GB8601600D0 GB8601600D0 (en) 1986-02-26
GB2185708A true GB2185708A (en) 1987-07-29
GB2185708B GB2185708B (en) 1989-10-25

Family

ID=10591816

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8601600A Expired GB2185708B (en) 1986-01-23 1986-01-23 Mould for injection moulding

Country Status (4)

Country Link
DD (1) DD256672A5 (en)
GB (1) GB2185708B (en)
HK (1) HK19890A (en)
MY (1) MY101137A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2650530A1 (en) * 1989-08-07 1991-02-08 Schlumberger Ind Sa METHOD FOR MAKING CARD BODIES WITH GRAPHICS
GB2299967A (en) * 1995-04-22 1996-10-23 Pathfinder Traffic Signs Limit Moulded articles with inserts retained inside a mould during moulding
EP0894600A1 (en) * 1997-07-30 1999-02-03 Ford Motor Company Method and apparatus for molding a film-covered article
NL1010605C2 (en) * 1998-11-20 2000-05-23 Schoeller Wavin Trepak B V Plastic crate manufactured by injection molding.
US6221304B1 (en) 1997-07-30 2001-04-24 Visteon Global Technologies, Inc. Method of manufacturing a film coated article

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111775391A (en) * 2019-04-04 2020-10-16 上海库石医疗技术有限公司 Structure for embedding flexible sheet in rubber product and method thereof

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2650530A1 (en) * 1989-08-07 1991-02-08 Schlumberger Ind Sa METHOD FOR MAKING CARD BODIES WITH GRAPHICS
EP0412893A1 (en) * 1989-08-07 1991-02-13 Schlumberger Industries Method for making card bodies and cards with graphic elements and card bodies so obtained
US5164144A (en) * 1989-08-07 1992-11-17 Schlumberger Industries Process for making card bodies and cards incorporating graphic symbols
GB2299967A (en) * 1995-04-22 1996-10-23 Pathfinder Traffic Signs Limit Moulded articles with inserts retained inside a mould during moulding
GB2299967B (en) * 1995-04-22 1998-03-18 Pathfinder Traffic Signs Limit Improvements in or relating to moulded articles
EP0894600A1 (en) * 1997-07-30 1999-02-03 Ford Motor Company Method and apparatus for molding a film-covered article
US5985198A (en) * 1997-07-30 1999-11-16 Ford Motor Company Method for molding a film-covered article
US6221304B1 (en) 1997-07-30 2001-04-24 Visteon Global Technologies, Inc. Method of manufacturing a film coated article
NL1010605C2 (en) * 1998-11-20 2000-05-23 Schoeller Wavin Trepak B V Plastic crate manufactured by injection molding.
EP1008527A1 (en) 1998-11-20 2000-06-14 Schoeller Wavin Trepak B.V. Injection moulded plastic crate

Also Published As

Publication number Publication date
GB8601600D0 (en) 1986-02-26
HK19890A (en) 1990-03-23
MY101137A (en) 1991-07-31
GB2185708B (en) 1989-10-25
DD256672A5 (en) 1988-05-18

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19980123