Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B7/00—Mixing; Kneading
  • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
  • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
  • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
  • B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
  • B29B7/42—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix
  • B29B7/428—Parts or accessories, e.g. casings, feeding or discharging means
  • B29B7/429—Screws
• • 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
  • B29C48/50—Details of extruders
  • B29C48/505—Screws
  • B29C48/52—Screws with an outer diameter varying along the longitudinal axis, e.g. for obtaining different thread clearance
• • 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
  • B29C48/50—Details of extruders
  • B29C48/505—Screws
  • B29C48/535—Screws with thread pitch varying along the longitudinal axis

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Extraction Or Liquid Replacement (AREA)
• Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
• Mixers Of The Rotary Stirring Type (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=20299049

Family Applications (1)

Country Status (9)

Families Citing this family (1)

• 1972
  • 1972-10-19 IT IT70285/72A patent/IT975295B/en active
  • 1972-10-23 JP JP47106598A patent/JPS4858452A/ja active Pending
  • 1972-10-31 DD DD166592A patent/DD99512A5/xx unknown
  • 1972-11-01 AU AU48426/72A patent/AU4842672A/en not_active Expired
  • 1972-11-03 DE DE2253917A patent/DE2253917A1/en active Pending
  • 1972-11-03 FR FR7238949A patent/FR2159291A1/en active Granted
  • 1972-11-03 BR BR007719/72A patent/BR7207719D0/en unknown
  • 1972-11-10 ES ES408676A patent/ES408676A1/en not_active Expired
  • 1972-11-16 ZA ZA727862A patent/ZA727862B/en unknown

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