US3712551A - Device for grinding synthetic resin or like having low melting temperature into powder - Google Patents

Device for grinding synthetic resin or like having low melting temperature into powder Download PDF

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Publication number
US3712551A
US3712551A US00068645A US3712551DA US3712551A US 3712551 A US3712551 A US 3712551A US 00068645 A US00068645 A US 00068645A US 3712551D A US3712551D A US 3712551DA US 3712551 A US3712551 A US 3712551A
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US
United States
Prior art keywords
liner
temperature
low melting
projections
rotor
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 - Lifetime
Application number
US00068645A
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English (en)
Inventor
M Hosokawa
T Yokoyama
T Suzuki
Y Aki
M Tokui
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.)
HASOKAWA FUNTAIKOGAKU KENKYUSH
HASOKAWA FUNTAIKOGAKU KENKYUSHO KK JA
Original Assignee
HASOKAWA FUNTAIKOGAKU KENKYUSH
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Publication date
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Publication of US3712551A publication Critical patent/US3712551A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/02—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft
    • B02C13/06—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor
    • B02C13/09—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor and throwing the material against an anvil or impact plate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/14—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers
    • B02C18/148—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers specially adapted for disintegrating plastics, e.g. cinematographic films
    • 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
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/10—Conditioning or physical treatment of the material to be shaped by grinding, e.g. by triturating; by sieving; by filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
    • B02C2023/165—Screen denying egress of oversize material

Definitions

  • ABSTRACT Apparatus for pulverizing materials having low melting points wherein the temperature of the material is maintained just below the melting and softening temperatures by controlling the flow of material into the pulverizing rotor which is surrounded by a liner and coordinating the flow of material with the speed of the rotor and the temperature of the air carrying the material.
  • One object of the invention resides in the provision of novel and improved apparatus for pulverizing materials having low melting points and without requiring the utilization of cooling apparatus.
  • the material to be powdered by the pulverizer is maintained at a temperature in the vicinity but not exceeding its softening or melting point. It has been found that synthetic resins and similar materials having low melting points also have low breakdown stresses at temperatures in the vicinity of the softening or melting points, and accordingly, are more easily powdered at the higher temperatures than at the lower temperatures unless severe impact forces are utilized.
  • impact-type pulverizers are used, the material fed into the pulverizer rapidly collides with the rotating crushing vanes and the projections of the liner. This action causes a material increase in the inhand, if the temperature is maintained just below the softening or melting temperature of the material, the breakdown stresses are minimized and the particles which are individually heated can be readily crushed.
  • the temperature in the pulverizer is maintained substantially uniform and at a point just below but not exceeding the softening or melting temperature. This can be effectively attained by controlling the amount of material being fed into the apparatus, by controlling the flow rate, by controlling the temperature of the air, or bycontrolling the operation of the pulverizer itself. It is evident that anyone or more of the foregoing can be utilized simultaneously. For example, in the event of overheating, the amount of material fed into the apparatus can be reduced, the rotation of the crushing rotor can be reduced, the circulation of air can be increased, and if desired, the air can be lowered in temperature. Should the temperature of the pulverizer be too low opposite procedures can be utilized to raise the temperature to the desired value.
  • the pulverizing apparatus in accordance with the invention includes a housing having an inlet port for introduction of the material and an outlet port for removal of the powdered material.
  • a cylindrical liner is disposed within the housing and has a plurality of segments each including a number of projections arranged to form pathsfor guiding the material toward the outlet port and a crushing rotor having a plurality of vanes, the ends ofwhich are spaced from the inner surface of the liner.
  • FIG. 1 is a side elevational view in partial section of one embodiment of the invention
  • FIG. 2 is a cross-sectional view of FIG. 1 taken along the line 11- thereof;
  • FIGS. 3a and 3b are enlarged views in partial section of the area A of FIG. 2;
  • FIG. 4 is a cross-sectional view similar to FIG. 2 showing a modified embodiment of the invention
  • FIG. 5 is a cross-sectional view of a liner for a pulverizer in accordance with the invention.
  • FIG. 6 is a plan view of a fragmentary portion of the liner illustrated in FIG. 5.
  • the device is provided with a housing 1 having an inlet port 2 and a crushing rotor 3, the latter having a plurality of crushing vanes 4.
  • the number of crushing vanes 4 is preferably made as large as possible in order to increase the area for applying impact to the material being crushed.
  • the crushing rotor 3 includes an annular passage for introduction of the material to be crushed and air from the inlet port 2 to the rotor 3.
  • the outlet port of the rotor consists of the radially disposed openings or gaps between the crushing vanes 4.
  • An annular liner 7 is disposed about the crushing rotor 3 and includes a plurality of segments 12 each having a number of inwardly extending projections 8 which are arranged in an annular configuration at appropriate intervals to form radial passage ways 9.
  • the passage ways 9 may be at right angles to the direction of rotation of the crushing rotor 3 or may be inclined relative thereto as illustrated in FIGS. 3a and 3b. The direction, angle of inclination, and aperture of the passage ways can be selected in accordance with the properties of the material to be crushed and the temperature to be maintained within the pulverizer.
  • the passage ways 9 communicate with the product exhaust or outlet 10 between the housing I and the liner 7.
  • the rotor 3 has a shaft 5 supported by bearings 6, the latter being carried by a base 11. The rotor may be driven by any suitable motor not shown.
  • the magnitude of the gap B between the crushing vanes 4 and the liner 7 is preferably about twice the size of the particles to be pulverized.
  • the impact crushing force ismaximum when the gap is slightly greater than the particle size.
  • Narrower gaps result in larger shearing forces which require increased torque and results in decreased efficiency.
  • wider gaps result in the accumulation of increased material which causes an increase in friction of the particles of material one with the others and with the inner face of the liner 7. This results in a reduction of the impact or crushing forces and produces substantial overheating.
  • the material to be pulverized is fed through the inlet port 2 and into the passage way in the rotor 3.
  • the centrifugal force applied to the material causes it to move outwardly through the gaps between the crushing vanes 4 and collide with the projections 8 of the liner 7.
  • the temperature is increased to a point just below but not exceeding the softening or melting temperature of the material, the material will be easily crushed by reason of the impact. Even if the material is accidentally overheated or locally heated, the heat is released through the passage ways 9 formed by the spaced liner segments 12, and this action prevents fusion of the crushed particles.
  • the crushing temperature can be maintained at a desired value by controlling the amount of material fed into the rotor, the size of the passage ways 9, the flow rate and the temperature of the air fed to the inlet port 2.
  • perforated plates 13 are disposed between the liner segments 12.
  • Each perforated plate 13 has a plurality of small holes 14 which serve as passage ways for the finely divided particles and air and aids in pulverizing the material to obtain the desired particle size. More specifically the small holes 14 function as a sieve as well as functioning in the same manner as the passage ways 9 of the pulverized shown in FIG. 1.
  • FIGS. 5 and 6 illustrate a further modification of the liner 7 as shown in FIG. 1.
  • the liner 7 of FIG. 5 and 6 consists of an alternate arrangement of projections 8 and depressions 16.
  • Each depression 16 has a plurality of holes extending therethrough as illustrated in FIG. 6. With this arrangement the material is crushed by the projections 8 and at the same time releases its heat upon passing through the holes 15. This results in the effective dissipation of heat and prevents overheating of the material and greatly facilitates mass production of the powdered material.
  • Material Low density polyethylene (Melting Point I 15C) Power of pulverizer: 30 h.p.
  • the pulverizer in accordance with the invention has a very high pulverizing etficiency of the order of 3.0 to 3.5 kilograms per horse power hour.
  • the highest efficiency obtainable with prior known pulverizers has been 1.0 to 1.2 kilograms per horse power hour.
  • the particles of powdered material produced in accordance with the invention do not have so-called whiskers or fiber-like projections which are characteristic of products formed by prior known pulverizers for low temperature materials.
  • a device for pulvenzing synthetic resins and other materials having relatively low melting points comprising a housing having an inlet port, an annular liner within and spaced from the wall of said housing, a crushing rotor within said annular liner and rotatable in one direction, said annular liner being formed of a plurality of segments, spaced one from the other to form gaps therebetween, said gaps being inclined in a direction opposite to said rotation, each of said segments having a plurality of inwardly extending projections, (a) said crushing rotor having a plurality of vanes arranged concentrically within said liner and having their outer edges spaced from said projections, and means for exhausting the powdered material emerging from said liner.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Crushing And Pulverization Processes (AREA)
US00068645A 1970-04-01 1970-09-01 Device for grinding synthetic resin or like having low melting temperature into powder Expired - Lifetime US3712551A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2757170 1970-04-01

Publications (1)

Publication Number Publication Date
US3712551A true US3712551A (en) 1973-01-23

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ID=12224685

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Application Number Title Priority Date Filing Date
US00068645A Expired - Lifetime US3712551A (en) 1970-04-01 1970-09-01 Device for grinding synthetic resin or like having low melting temperature into powder

Country Status (6)

Country Link
US (1) US3712551A (enrdf_load_stackoverflow)
CA (1) CA931547A (enrdf_load_stackoverflow)
DE (1) DE2115760A1 (enrdf_load_stackoverflow)
FR (1) FR2092255A5 (enrdf_load_stackoverflow)
GB (1) GB1293216A (enrdf_load_stackoverflow)
NL (1) NL7012424A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105498918A (zh) * 2015-12-30 2016-04-20 天津横天生物科技有限公司 用于粉剂生产的粉碎装置
BE1030049B1 (nl) * 2021-12-20 2023-07-18 Katoen Natie Grinding And Compounding Services Nv Werkwijze voor uniforme vermaling van grondstoffen

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD157955A3 (de) * 1981-03-26 1982-12-22 Werner Sauermann Hammermuehle
CN113713911B (zh) * 2021-09-08 2022-08-16 江苏金联能源科技有限公司 一种建筑工程用防震破碎机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2699898A (en) * 1951-04-06 1955-01-18 Riley Stoker Corp Hot-air swept mills, with series arranged, hammer-crushing chamber, and peg and disk pulverizing chamber
GB811424A (en) * 1956-09-18 1959-04-08 Thomas Engel Method of, and apparatus for, pulverising thermoplastic materials
US2974883A (en) * 1955-10-05 1961-03-14 Vasco Ind Corp Process for pulverizing thermoplastic material
US3381904A (en) * 1964-10-26 1968-05-07 Kewanee Mach & Conveyor Co Processing apparatus
US3614004A (en) * 1969-05-26 1971-10-19 Allis Chalmers Mfg Co Concave ring for cone crushers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2699898A (en) * 1951-04-06 1955-01-18 Riley Stoker Corp Hot-air swept mills, with series arranged, hammer-crushing chamber, and peg and disk pulverizing chamber
US2974883A (en) * 1955-10-05 1961-03-14 Vasco Ind Corp Process for pulverizing thermoplastic material
GB811424A (en) * 1956-09-18 1959-04-08 Thomas Engel Method of, and apparatus for, pulverising thermoplastic materials
US3381904A (en) * 1964-10-26 1968-05-07 Kewanee Mach & Conveyor Co Processing apparatus
US3614004A (en) * 1969-05-26 1971-10-19 Allis Chalmers Mfg Co Concave ring for cone crushers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105498918A (zh) * 2015-12-30 2016-04-20 天津横天生物科技有限公司 用于粉剂生产的粉碎装置
BE1030049B1 (nl) * 2021-12-20 2023-07-18 Katoen Natie Grinding And Compounding Services Nv Werkwijze voor uniforme vermaling van grondstoffen

Also Published As

Publication number Publication date
CA931547A (en) 1973-08-07
DE2115760A1 (de) 1971-11-04
FR2092255A5 (enrdf_load_stackoverflow) 1971-01-21
NL7012424A (enrdf_load_stackoverflow) 1971-10-05
GB1293216A (en) 1972-10-18

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