GB1283165A - Method and apparatus for pelletizing synthetic resinous material - Google Patents

Method and apparatus for pelletizing synthetic resinous material

Info

Publication number
GB1283165A
GB1283165A GB688771A GB688771A GB1283165A GB 1283165 A GB1283165 A GB 1283165A GB 688771 A GB688771 A GB 688771A GB 688771 A GB688771 A GB 688771A GB 1283165 A GB1283165 A GB 1283165A
Authority
GB
United Kingdom
Prior art keywords
drum
strands
drums
rubber
cutting
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
GB688771A
Inventor
Alvin Stanley Topolski
Walter Anthony Trumbull
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.)
Dow Chemical Co
Original Assignee
Dow Chemical Co
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 Dow Chemical Co filed Critical Dow Chemical Co
Priority to GB688771A priority Critical patent/GB1283165A/en
Publication of GB1283165A publication Critical patent/GB1283165A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
    • B26D1/25—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member
    • B26D1/34—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut
    • B26D1/38—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut and coacting with a fixed blade or other fixed member

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

1283165 Roller mills DOW CHEMICAL CO 15 March 1971 6887/71 Heading B2A [Also in Division B5] Strands of synthetic resin are chopped into pellets by a pair of rotating toothed drums, each drum having shearing teeth arranged to slidingly engage those of the other drum, the engaging face 33 of each tooth being generally radial and defining a relief angle A with the radius of between 0‹ and 30‹, the included angle B between the engaging face 33 and the non-engaging face 34 being between 10‹ and 45‹. Preferably the tip of each tooth has a small flat 35, and the rotation of the drums is synchronised e.g. by arranging that one drum is driven and imparts the rotation to the second to which a braking force is applied to keep the interengaging teeth smoothly meshing. The strands may be fed into the cutting drum from rolls driven by belt and pulley transmission from the first drum, variable speed or variable effective diameter pulleys being used (Fig. 3, not shown). For high-speed operation, especially with small diameter drums, a further roll is placed adjacent to the first cutting drum to bring the strands into close contact with the latter before they are fed around into the nip between the severing teeth. When cutting very viscous materials a mould release composition such as a polysiloxane is applied to the drum surface and when cutting freshly extruded material, or other material at high temperature, the drums are cooled e.g. by a water spray or by air, nitrogen or alcohol. The plastics strands to be pelletized are intended to be soft or rubbery and if hard or brittle material is to be cut it should be heated first, a bending test to categorise the material being given. A detailed dimensioned example of the pelletizing of a blend of 50/50 w/w polytertiary butyl styrene and polyvinyl chloride is described; other exemplary materials are polystyrene (at 245‹F), uncured rubber, plasticized polyvinyl chloride, rubber-modified polystyrene, rubber-modified polymethyl methacrylate and graft polymers of styrene and rubber. Working speeds may be as low as 1 foot per sec. or as high as 2000 ft. per sec.
GB688771A 1971-03-15 1971-03-15 Method and apparatus for pelletizing synthetic resinous material Expired GB1283165A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB688771A GB1283165A (en) 1971-03-15 1971-03-15 Method and apparatus for pelletizing synthetic resinous material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB688771A GB1283165A (en) 1971-03-15 1971-03-15 Method and apparatus for pelletizing synthetic resinous material

Publications (1)

Publication Number Publication Date
GB1283165A true GB1283165A (en) 1972-07-26

Family

ID=9822616

Family Applications (1)

Application Number Title Priority Date Filing Date
GB688771A Expired GB1283165A (en) 1971-03-15 1971-03-15 Method and apparatus for pelletizing synthetic resinous material

Country Status (1)

Country Link
GB (1) GB1283165A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2145013A (en) * 1983-07-12 1985-03-20 Derek Sidney Izzard Comminuting wires

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2145013A (en) * 1983-07-12 1985-03-20 Derek Sidney Izzard Comminuting wires

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees