ZA949999B - Process for the processing of thermoplastic polymers by means of the injection-moulding technique - Google Patents

Process for the processing of thermoplastic polymers by means of the injection-moulding technique

Info

Publication number
ZA949999B
ZA949999B ZA949999A ZA949999A ZA949999B ZA 949999 B ZA949999 B ZA 949999B ZA 949999 A ZA949999 A ZA 949999A ZA 949999 A ZA949999 A ZA 949999A ZA 949999 B ZA949999 B ZA 949999B
Authority
ZA
South Africa
Prior art keywords
injection
line
processing
thermoplastic polymers
weld
Prior art date
Application number
ZA949999A
Inventor
Etienne Aeppli
Original Assignee
Huber & Suhner A G
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 Huber & Suhner A G filed Critical Huber & Suhner A G
Publication of ZA949999B publication Critical patent/ZA949999B/en

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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • 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
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/5605—Rotatable mould parts
    • 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0031—Movable mould wall parts in contact with weld lines, e.g. rotating pins for stirring the weld line
    • 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
    • B29C2045/0098—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor shearing of the moulding material, e.g. for obtaining molecular orientation or reducing the viscosity
    • 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
    • B29K2105/0079—Liquid crystals

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Moulding By Coating Moulds (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

In the case of liquid crystal polymers, on the one hand the rigid molecule chains and on the other hand possibly present fibrous reinforcing materials are aligned largely parallel to a weld line or flow line, with the result that the physical properties are lacking in the region of the weld line or flow line. It is an object of the invention to provide a possible way of preventing weld lines or flow lines from occurring in the first place. For this purpose, the liquidified material is subjected to a shearing energy from its entry into the injection mould, over at least part of the length of the workpiece. This shearing energy is produced by relative movement between two surfaces of the mould parts. <IMAGE>
ZA949999A 1993-12-17 1994-12-15 Process for the processing of thermoplastic polymers by means of the injection-moulding technique ZA949999B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH377893 1993-12-17

Publications (1)

Publication Number Publication Date
ZA949999B true ZA949999B (en) 1995-08-22

Family

ID=4263291

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA949999A ZA949999B (en) 1993-12-17 1994-12-15 Process for the processing of thermoplastic polymers by means of the injection-moulding technique

Country Status (13)

Country Link
EP (1) EP0658412B1 (en)
JP (1) JPH07214596A (en)
CN (1) CN1065812C (en)
AT (1) ATE163590T1 (en)
BR (1) BR9404945A (en)
CA (1) CA2138221C (en)
DE (1) DE59405377D1 (en)
DK (1) DK0658412T3 (en)
ES (1) ES2114649T3 (en)
FI (1) FI106440B (en)
IL (1) IL111844A (en)
NO (1) NO308452B1 (en)
ZA (1) ZA949999B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19720430C2 (en) * 1997-05-15 2002-01-17 Bsh Bosch Siemens Hausgeraete Process and arrangement for injection molding to influence weld lines
CN106273319A (en) * 2016-10-13 2017-01-04 吕安民 A kind of Plastic Welding extruding machine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1113559B (en) * 1959-07-31 1961-09-07 Ankerwerk Gebr Goller Process for the systematic control of the direction of orientation in the inner structure of parts made of thermoplastic material during their manufacture in injection molding machines
US3263274A (en) * 1963-03-14 1966-08-02 Beckman Instruments Inc High strength rotary member and method
CA1243462A (en) * 1984-12-21 1988-10-25 Peter S. Allan Moulding process
JPS63145007A (en) * 1986-12-09 1988-06-17 Matsushita Electric Ind Co Ltd Method for injection molding
JPH0773860B2 (en) * 1990-05-10 1995-08-09 修 浜田 Molding die equipment

Also Published As

Publication number Publication date
JPH07214596A (en) 1995-08-15
DE59405377D1 (en) 1998-04-09
IL111844A (en) 1998-12-06
ES2114649T3 (en) 1998-06-01
IL111844A0 (en) 1995-03-15
FI106440B (en) 2001-02-15
EP0658412A1 (en) 1995-06-21
CN1110647A (en) 1995-10-25
CA2138221C (en) 1999-05-04
DK0658412T3 (en) 1998-09-28
FI945938A (en) 1995-06-18
NO308452B1 (en) 2000-09-18
ATE163590T1 (en) 1998-03-15
EP0658412B1 (en) 1998-03-04
CA2138221A1 (en) 1995-06-18
BR9404945A (en) 1995-08-08
NO944898D0 (en) 1994-12-16
FI945938A0 (en) 1994-12-16
NO944898L (en) 1995-06-19
CN1065812C (en) 2001-05-16

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