GB2330790A - Thermoplastics plug used for injecting/extruding thermoplastics material - Google Patents

Thermoplastics plug used for injecting/extruding thermoplastics material Download PDF

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Publication number
GB2330790A
GB2330790A GB9722732A GB9722732A GB2330790A GB 2330790 A GB2330790 A GB 2330790A GB 9722732 A GB9722732 A GB 9722732A GB 9722732 A GB9722732 A GB 9722732A GB 2330790 A GB2330790 A GB 2330790A
Authority
GB
United Kingdom
Prior art keywords
plug
compression chamber
processed
heating
injection moulding
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Withdrawn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
GB9722732A
Other versions
GB9722732D0 (en
Inventor
Richard Victor Johnson
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB9722732A priority Critical patent/GB2330790A/en
Publication of GB9722732D0 publication Critical patent/GB9722732D0/en
Publication of GB2330790A publication Critical patent/GB2330790A/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Withdrawn legal-status Critical Current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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/475—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pistons, accumulators or press rams
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/475—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pistons, accumulators or press rams
    • B29C48/48—Two or more rams or pistons
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

A means of injecting/extruding thermoplastic materials where the injection/extrusion force is applied via a plug 2 manufactured from the same material as the one being processed and driven by a plunger or plungers or by a compressed gas and which will on subsequent injection/extrusion strokes pass through the molten section and there merge with the material being processed.

Description

THERMOPLASTIC PLUG This invention relates to a thermoplastic plug Thermoplastic materials are formed by injection moulding or extrusion. They are normally supplied in a granular form, which is fed into a barrel shaped, combined heating and compression chamber. Here they are heated to their molten form and then forced from the chamber into a mould or through an extrusion head. Subsequent cooling provides a finished thermoplastic product.
In existing machines the injection/extrusion force is applied by a plunger or by rotation of a screw within the chamber or by a combination of the two.
According to the present invention the injection/extrusion force (1) is applied to the molten thermoplastic material (7) via a plug (2) which has been manufactured from the same material as the one which is being processed. In this context thermoplastic relates to any material which can be heated to its molten form and will return to its original (or near original) state on cooling.
The force (1) on the plug (2) would be applied by a plunger or plungers driven by any suitable means. Or where the plug (2) had been designed to form a seal against the wall ofthe compression chamber (4). The force (1) on the plug (2) would be applied by means of a suitable compressed gas.
The injection/extrusion process would then be as follows: i) The heating/compression chamber (4) would be heated (6) at one end but remain cool at the other.
(As existing machines) ii) Unheated or preheated thermoplastic material in granular form (3) would be fed into the cool end.
(As existing machines) iii) A plug (2) manufactured from the same material, as the one being processed would be placed into the cool end. iv) This plug would be forced towards the heated end causing molten plastic (7) to be injected/extruded from the heated end (9). v) Injection/intrusion would cease before the forcing plug reached the heated section (5) vi) Subsequent injection/extrusion strokes would cause the spent plugs (8) to pass through the heated section where they would melt and merge with the process material.
Fig one. Shows section views of the heating/compression chamber described above.

Claims (3)

  1. CLAIMS 1. An injection moulding or extrusion machine where pressure is applied to the molten thermoplastic material in the heating/compression chamber by means of a plug manufactured from the same material as the one which is being processed, the plug being propelled forward by a plunger or plungers driven by any suitable means.
  2. 2. An injection moulding or extrusion machine where pressure is applied to the molten thermoplastic material in the heating/compression chamber by means of a plug manufactured from the same material as the one which is being processed, the plug being designed to form a seal against the wall of the compression chamber and driven forward by means of a suitable compressed gas.
  3. 3. An injection moulding or extrusion machine where an unattached plug manufactured from the same thermoplastic material as the one which is being processed, which having once been used to apply pressure to the molten materials in the heating/compression chamber as described in either 1 or 2 above will then pass through the heated section on subsequent strokes and there melt and merge with the process material.
    3. An injection moulding or extrusion machine where a plug manufactured from the same thermoplastic material as the one which is being processed, which having once been used to apply pressure to the molten materials in the heating/compression chamber as described in either 1 or 2 above will then pass through the heated section on subsequent strokes and there melt and merge with the process material.
    Amendments to the claims have been filed as follows 1. An injection moulding or extrusion machine where pressure is applied to the molten thermoplastic material in the heating/compression chamber by means of an unattached plug manufactured from the same material as the one which is being processed, the plug being propelled forward by a plunger or plungers driven by any suitable means.
    2. An injection moulding or extrusion machine where pressure is applies to the molten thermoplastic material in the heating/compression chamber by means of an unattached plug manufactured from the same material as the one which is being processed, the plug being designed to form a seal against the wall of the compression chamber and driven forward by means of a suitable compressed gas.
GB9722732A 1997-10-29 1997-10-29 Thermoplastics plug used for injecting/extruding thermoplastics material Withdrawn GB2330790A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9722732A GB2330790A (en) 1997-10-29 1997-10-29 Thermoplastics plug used for injecting/extruding thermoplastics material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9722732A GB2330790A (en) 1997-10-29 1997-10-29 Thermoplastics plug used for injecting/extruding thermoplastics material

Publications (2)

Publication Number Publication Date
GB9722732D0 GB9722732D0 (en) 1997-12-24
GB2330790A true GB2330790A (en) 1999-05-05

Family

ID=10821200

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9722732A Withdrawn GB2330790A (en) 1997-10-29 1997-10-29 Thermoplastics plug used for injecting/extruding thermoplastics material

Country Status (1)

Country Link
GB (1) GB2330790A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4212840A (en) * 1977-09-19 1980-07-15 Imperical Chemical Industries Limited Extrusion apparatus and method for extruding abrasive pastes
US4266919A (en) * 1979-08-09 1981-05-12 E. I. Du Pont De Nemours And Company Ram-extrusion apparatus for non-melt fabricable polymeric resins
US4386902A (en) * 1979-10-02 1983-06-07 Fjellman Press Ab Machine for handling or treating plastic material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4212840A (en) * 1977-09-19 1980-07-15 Imperical Chemical Industries Limited Extrusion apparatus and method for extruding abrasive pastes
US4266919A (en) * 1979-08-09 1981-05-12 E. I. Du Pont De Nemours And Company Ram-extrusion apparatus for non-melt fabricable polymeric resins
US4386902A (en) * 1979-10-02 1983-06-07 Fjellman Press Ab Machine for handling or treating plastic material

Also Published As

Publication number Publication date
GB9722732D0 (en) 1997-12-24

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Legal Events

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