GB2503258A - Moulding method - Google Patents

Moulding method Download PDF

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Publication number
GB2503258A
GB2503258A GB201210952A GB201210952A GB2503258A GB 2503258 A GB2503258 A GB 2503258A GB 201210952 A GB201210952 A GB 201210952A GB 201210952 A GB201210952 A GB 201210952A GB 2503258 A GB2503258 A GB 2503258A
Authority
GB
United Kingdom
Prior art keywords
container
moulding
extruded
containers
plastics material
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.)
Withdrawn
Application number
GB201210952A
Other versions
GB201210952D0 (en
Inventor
Christopher Whiteley
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.)
Oxford Plastic Systems Ltd
Original Assignee
Oxford Plastic Systems Ltd
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 Oxford Plastic Systems Ltd filed Critical Oxford Plastic Systems Ltd
Priority to GB201210952A priority Critical patent/GB2503258A/en
Publication of GB201210952D0 publication Critical patent/GB201210952D0/en
Publication of GB2503258A publication Critical patent/GB2503258A/en
Withdrawn legal-status Critical Current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
    • B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
    • B29C31/04—Feeding of the material to be moulded, e.g. into a mould cavity
    • B29C31/042—Feeding of the material to be moulded, e.g. into a mould cavity using dispensing heads, e.g. extruders, placed over or apart from the moulds
    • 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
    • B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
    • B29C31/04—Feeding of the material to be moulded, e.g. into a mould cavity
    • B29C31/042—Feeding of the material to be moulded, e.g. into a mould cavity using dispensing heads, e.g. extruders, placed over or apart from the moulds
    • B29C31/047—Feeding of the material to be moulded, e.g. into a mould cavity using dispensing heads, e.g. extruders, placed over or apart from the moulds combined with moving moulds
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/34—Feeding the material to the mould or the compression means

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Robotics (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

A moulding method comprises extruding a quantity of plastics material and then compression moulding the extruded plastics material into the desired shape. An apparatus suitable for the method comprises an extruder 10 arranged to extrude material into a container 12, 14 and a compression moulding press 20. Preferably, the plastics material is extruded into an intermediate container to pre-mould the plastics material into the general shape of the final product; the container is then transferred on a transfer device 22 to the moulding press. One or more containers may be provided, the extruder being arranged to extrude material continuously into the containers in turn a valve arrangement 16 may be used to control which of the containers the material is extruded. Additional moulding presses may be provided associated with each of the containers. The transfer device may be arranged to move the container to a position above the lower half of the mould and to tip the extruded material into the cavity.

Description

I
Plastics Moulding This invention relates to the moulding of p ashes materials In particular, the invention relates to a method of moukJing a plastics material of relatwely high viscosity, when molten, and to an apparatus for use in the methoth Although intended primarily fo.r use in the moulding of relatively high viscosity mallen matenals tt will be appreciatec that the method and apparatus may also be used in the moulding of materials of lower viscosity when molten.
Where a plastics material is used in the formation of feet for a temporary fence, it is usual to incorporate a filler, for example catcium carbonate, into the plastics materi.l to.
increase the density of the material Typically, a t&cyeled flexible PVC material iriporportir)g a quahtity!=. calcuni carbonate filler i$ used in the manufactute of such feet, the finished product having a mass of typically around 24 kg, such a high mass is being ncesSary to flure that, in use, the fence is tabie A typical moulding technique ftc use in the manufacture of such feet is injection moulding. h3owever, as the material used contains a Sigr4icè.nt untity of the filler material, the material is of relatively hign viscosity, when molten As a result the injection pressures which must be used n the injection rnouiding process are high As a result the eqwpment used 1n the technique is relatively complex and expensive According to. one aspect of the invention there is provided a moulding method comprising ex4ruding a quantity of the plastics material, and then compression moulding the quantity of extruded plastics material into the desired shape.
The plastics material may be extruded into a container.
The container into which the piastics material may be extrudea is conveniently shaped so. as tO pre-mould the plastics material into the general shape of the final product, thereby simplifying the compression moulding operation The inventicn also relates to a moulding app&atus sDitable for use in the method described hereinbefore, the apparatus comprising an extruder ananged to extrude material into a container, and a compression moulding press. A transfer device for transferring extruded material from the container to the moulding press may also be provided.
The apparatus may further include one or more addition containers,. th.e extruder S being arranged to extrude material into the rotitàiners, Th turn: to allow continuous operation of the extruder. Additional moulding presses are conveniently also provided, each moulding press being associated with a corresponding one of the containers.
The nvention wnl further be described by way of example with reference to the 0 accompanying drawing Figure 1 which is a diagrarnmatc v ew illustrating a moulding apparatus in accordance with one embodiment of the invention.
Refemng to Figure 1, the moulding apparatus coimprises an extruder 10 adapted to extrude a plastics material including a mineral filler into cOntainers 12. 14, fti turn. A valve arrangement 16 is used to control into which of the containers 12, 14 the material is extruded at any given time. The extruder 10 convenientiy has a heated barrel and screw and serves to heat and mix the ptastics material prior to delivery to one of the containers 12. 14.
Each container 12, 14 includes an internal cavity which shaped to conform, genierally, with the shape of the product to be moulded A sensor 18 is associated witn each container 12, 14 to determine when each, container 12, 14 has been completely filled with plastics material.
2.5 Associated with each container 12, 14 is a compression rnoyding pres.20 having a cavity QQflforrning with the shape.of the article to be moulded.
A transfer device 22 a associated with ench container 12, 14 and arranged to transfer a billet of extruded plastics material from the. respective container 12, 14 to the mould of the associated pess 20 1 he transfer device 20 may take a wide range of orms By way of example the transfer device 20 may be arrangea to move the associated container, when full. toa position abov the lower half of the rnould.of the press. when open, and to tip the billet into the cavity of the lower mould half.
In use, the extruder 10 supplies plastics material to the container 12 until the container 12 is.fufl as determined by the sensor 18. When it is determined that the container 12 is full, the valve 16 is switched so that continued operation of the extruder 1.0 delveEs material to the container 14. The transfer device 22 transfers the material from the container 1 2 to the. moulding cavity of the associated press 20, leaving the. container 12.ready to rece.iye. a further deliveryct plastics material. The press.20 is operated to form the plastics material into the desired shape, After a predetermined time, the press 20 is opened and the nioulded produd ejected, Whilst onö press 20 is in operation, piatic material is being extruded into the other container 14 and transferr d to the associated press, It will he appreciated that the apparatus described hereinbetore can be operated with the extruder running constantly. The 00 tinuous operation of the extruder may assist in consistent processing..
As described hereinbefore. the inventio,n is particularly advantageous in the moulding of articles from plastics materials of high viscosity when molten, for example materials including a significant quantity of miners.! fillers By way of example, the invention may be used in the manufacture of feet for temporary fencing using PVC with a calcium carbonate.filler.
A number of Other vahatiohe and modifications are possible within the scope of the invention. 4.
GB201210952A 2012-06-21 2012-06-21 Moulding method Withdrawn GB2503258A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB201210952A GB2503258A (en) 2012-06-21 2012-06-21 Moulding method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB201210952A GB2503258A (en) 2012-06-21 2012-06-21 Moulding method

Publications (2)

Publication Number Publication Date
GB201210952D0 GB201210952D0 (en) 2012-08-01
GB2503258A true GB2503258A (en) 2013-12-25

Family

ID=46641238

Family Applications (1)

Application Number Title Priority Date Filing Date
GB201210952A Withdrawn GB2503258A (en) 2012-06-21 2012-06-21 Moulding method

Country Status (1)

Country Link
GB (1) GB2503258A (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741699A (en) * 1970-06-10 1973-06-26 Pennwalt Corp Variable volume and controlled density forming mechanism for compression molding presses
US3877862A (en) * 1973-11-16 1975-04-15 Pennwalt Corp Feeder for multi-cavity compression molding apparatus
FR2504446A1 (en) * 1981-04-24 1982-10-29 Varteressian Gerard Automated loading of tool for compression moulding thermoplastics - as simple, low pressure alternative to injection moulding
JPH02125709A (en) * 1988-11-07 1990-05-14 Hitachi Ltd Molding device, molding method and transfer jig for plastic
JPH09300347A (en) * 1996-05-13 1997-11-25 Honda Motor Co Ltd Method and tool for practical use of plastic waste matter
US20040253429A1 (en) * 1997-12-18 2004-12-16 Polk Dale B. Thermoplastic molding process and apparatus
US20060138689A1 (en) * 2004-12-29 2006-06-29 Endrud John N Apparatus and method for compression molding a chair mat
US20070210471A1 (en) * 2004-05-11 2007-09-13 Nestle Waters Management & Technology Method and device for the production of a plastic preform

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741699A (en) * 1970-06-10 1973-06-26 Pennwalt Corp Variable volume and controlled density forming mechanism for compression molding presses
US3877862A (en) * 1973-11-16 1975-04-15 Pennwalt Corp Feeder for multi-cavity compression molding apparatus
FR2504446A1 (en) * 1981-04-24 1982-10-29 Varteressian Gerard Automated loading of tool for compression moulding thermoplastics - as simple, low pressure alternative to injection moulding
JPH02125709A (en) * 1988-11-07 1990-05-14 Hitachi Ltd Molding device, molding method and transfer jig for plastic
JPH09300347A (en) * 1996-05-13 1997-11-25 Honda Motor Co Ltd Method and tool for practical use of plastic waste matter
US20040253429A1 (en) * 1997-12-18 2004-12-16 Polk Dale B. Thermoplastic molding process and apparatus
US20070210471A1 (en) * 2004-05-11 2007-09-13 Nestle Waters Management & Technology Method and device for the production of a plastic preform
US20060138689A1 (en) * 2004-12-29 2006-06-29 Endrud John N Apparatus and method for compression molding a chair mat

Also Published As

Publication number Publication date
GB201210952D0 (en) 2012-08-01

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)