GB1459882A - Injection moulding - Google Patents

Injection moulding

Info

Publication number
GB1459882A
GB1459882A GB4082274A GB4082274A GB1459882A GB 1459882 A GB1459882 A GB 1459882A GB 4082274 A GB4082274 A GB 4082274A GB 4082274 A GB4082274 A GB 4082274A GB 1459882 A GB1459882 A GB 1459882A
Authority
GB
United Kingdom
Prior art keywords
core material
mould cavity
bubble former
injection moulding
nozzle
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.)
Expired
Application number
GB4082274A
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.)
LO SFRUTTAMENTO DI BREVETTI SA
Original Assignee
LO SFRUTTAMENTO DI BREVETTI SA
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 CH1347973A external-priority patent/CH570258A5/en
Priority claimed from CH233474A external-priority patent/CH575284A5/en
Priority claimed from CH581274A external-priority patent/CH576856A5/en
Application filed by LO SFRUTTAMENTO DI BREVETTI SA filed Critical LO SFRUTTAMENTO DI BREVETTI SA
Publication of GB1459882A publication Critical patent/GB1459882A/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
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/0492—Devices for feeding the different materials
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3442—Mixing, kneading or conveying the foamable material
    • 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
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/16—Fillers

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Molding Of Porous Articles (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

1459882 Sandwich injection moulding SOC INTERNAZIONALE PER LO SFRUTTAMENTO DI BREVETTI SA 19 Sept 1974 [19 Sept 1973 20 Feb 1974 29 April 1974] 40822/74 Heading B5A A sandwich moulding process comprises injecting core and skin materials simultaneously into a mould cavity through concentric injection nozzles 5, 8 the core material having a bubbleformer incorporated therein which produces microscopic bubbles 16 within the mould cavity. Plasticizers 1, 2 and injectors 3, 4 are provided for each of the materials, and the injectors 3, 4 are controlled by regulators 10, 11. The bubble former may be a granular material e.g. wood shavings with absorbed water or water and/or steam introduced into the core material. The inner nozzle 8 may be movable to vary the depth of penetration into the mould cavity. Micropores may also be produced in the core material be means of a chemical agent or by a compressed gas or steam introduced through a further nozzle within the nozzle 8. Tools 14a, 14b (Fig. 2) are used to squeeze the skin material together at the beginning and end of the injection moulding operation. The bubble former may be introduced into the core material by passing the bubble former through pipes 9a to perforations 9d in a plate 9e of an apparatus 9, whereupon the bubble former moves with the core material flowing in direction 9c through the plates 9e.
GB4082274A 1973-09-19 1974-09-19 Injection moulding Expired GB1459882A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH1347973A CH570258A5 (en) 1973-09-19 1973-09-19 Foam core articles with outer skin - are injection moulded with large bubbles in core produced by gas
CH233474A CH575284A5 (en) 1974-02-20 1974-02-20 Foamed plastics injection moulded articles - with skin and core latter of which is formed by inhibiting foaming before injection nozzle
CH581274A CH576856A5 (en) 1974-04-29 1974-04-29 Foamed plastics injection moulded articles - with skin and core latter of which is formed by inhibiting foaming before injection nozzle

Publications (1)

Publication Number Publication Date
GB1459882A true GB1459882A (en) 1976-12-31

Family

ID=27173631

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4082274A Expired GB1459882A (en) 1973-09-19 1974-09-19 Injection moulding

Country Status (6)

Country Link
JP (3) JPS5094078A (en)
BR (1) BR7407799A (en)
CA (1) CA1037665A (en)
FR (1) FR2243799B1 (en)
GB (1) GB1459882A (en)
IT (1) IT1021486B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2116902A (en) * 1982-03-15 1983-10-05 William Chester Witkowski Injection moulding plastics articles

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5798799A (en) * 1980-12-10 1982-06-19 Mitsubishi Heavy Ind Ltd Chemical cleaning method for combined boiler
JPS5960103A (en) * 1982-09-29 1984-04-06 バブコツク日立株式会社 Boiler device
JP2010036563A (en) * 2008-08-08 2010-02-18 Kasai Kogyo Co Ltd Resin molded article and molding method thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH566207A5 (en) * 1972-12-07 1975-09-15 Siemag Siegener Masch Bau

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2116902A (en) * 1982-03-15 1983-10-05 William Chester Witkowski Injection moulding plastics articles

Also Published As

Publication number Publication date
CA1037665A (en) 1978-09-05
JPS5094078A (en) 1975-07-26
BR7407799A (en) 1975-10-14
FR2243799B1 (en) 1978-12-29
IT1021486B (en) 1978-01-30
FR2243799A1 (en) 1975-04-11
JPS5415968A (en) 1979-02-06
JPS5415969A (en) 1979-02-06

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Legal Events

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