Method and apparatus for molding preexpanded plastic beads

• US 3,099,045 A
• Filed: 06/01/1960
• Issued: 07/30/1963
• Est. Priority Date: 06/01/1960
• Status: Expired due to Term

• Current Assignee: Arvid Honkanen
• Original Assignee: Arvid Honkanen
• Inventors: ARVID HONKANEN
• Application Number:
  US04/033,328
• Time in Patent Office: 1,154 Days
• US Class Current: 264/349
• CPC Class Codes: B29C 31/02 Dispensing from vessels, e.g. hoppers into a mould cavity B29C31/04; large containers characterised by discharge means B65D88/28, B65D88/54
• CPC Class Codes: B29C 31/041 using filling or dispensing heads placed in closed moulds or in contact with mould walls B29C45/27 takes precedence
• CPC Class Codes: B29C 44/3426 Heating by introducing steam in the mould
• CPC Class Codes: B29C 44/445 in the form of expandable granules, particles or beads
• CPC Class Codes: B29K 2105/04 cellular or porous
• CPC Class Codes: B29K 2105/251 Particles, powder or granules expandable particles B29K2105/046
• CPC Class Codes: Y10S 264/09 Pre-expansion of foamed polystyrene
• CPC Class Codes: Y10S 264/10 Foamed polystyrene mold filling
• CPC Class Codes: Y10S 264/65 Processes of preheating prior to molding

Claims

2. A METHOD OF PNEUMATICALLY DEPOSITING A FULL CHARGE OF PLASTIC PARTICLES IN A MOLD CAVITY COMPRISING THE STEPS OF, FLOWING A PRESSURIZED GAS STREAM ALONG A MAIN FLOW PATH AT A HIGH VELOCITY, FEEDING PLASTIC PARTICLES FROM A STORAGE RESERVOIR INTO SAID GAS STREAM, ENTRAINING SAID PLASTIC PARTICLES IN SAID GAS STREAM THEREBY CARRYING SAID PLASTIC PARTICLES ALONG SAID MAIN FLOW PATH, JOINING SAID MAIN FLOW PATH AS A COMMON JUNCTURE TO FIRST AND SECOND ALTERNATE FLOW PATHS LEADING BACK TO SAID RESERVOIR AND INTO SAID MOLD CAVITY RESPECTIVELY, PROVIDING A RESISTANCE TO THE FLOW OF GAS STREAM AND ENTRAINED PARTICLES FROM SAID MAIN FLOW PATH INTO SAID FIRS ALTERNATE FLOW PATH, PROVIDING A SUBSTANTIALLY SMALLER RESISTANCE TO THE FLOW OF SAID GAS STREAM AND ENTRAINED PARTICLES FROM SAID MAIN FLOW PAT INTO SAID SECOND ALTERNATE FLOW PATH AS COMPARED TO THE FLOW RESISTANCE INTO SAID FIRST ALTERNATE FLOW PATH WHEREBY SAID GAS STREAM AND EN-