US2564880A - Apparatus for compressing thermoplastic masses - Google Patents

Apparatus for compressing thermoplastic masses Download PDF

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Publication number
US2564880A
US2564880A US9581A US958148A US2564880A US 2564880 A US2564880 A US 2564880A US 9581 A US9581 A US 9581A US 958148 A US958148 A US 958148A US 2564880 A US2564880 A US 2564880A
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US
United States
Prior art keywords
turns
axis
compressing
spiral
conical
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
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US9581A
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English (en)
Inventor
Colombo Roberto
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Individual
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Individual
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Filing date
Publication date
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Publication of US2564880A publication Critical patent/US2564880A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/22—Extrusion presses; Dies therefor
    • 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
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • 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
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • 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
    • B29C48/68—Barrels or cylinders
    • 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
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S100/00—Presses
    • Y10S100/903—Pelleters
    • Y10S100/904—Screw
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19555—Varying speed ratio

Definitions

  • This invention relates to an apparatus for the compression of plastic masses more particularly in extrusion presses.
  • the apparatus comprises a central body of conical spiral shape, which is moved eccentrically and parallel to itself within a chamber in the shape of a conical screw.
  • the movement performed by the central body is only a circular movement of its axis parallel to itself, so as to displace the turns of the conical spiral of the inner element within the turns of the conical spiral of the stationary outer element, thereby gradually displacing the line of contact of the various turns over the full quadrant.
  • the desired compression is of course determined by the axial extent of the steps of the helices and the output of the machine by the pitch of the spiral.
  • a baclrflow of material from the outlet towards the inlet is impossible, since each turn of the inner element contacts along a line parallel to the axis of said inner element with the corresponding turn cf the outer element.
  • the inner and outer conical spirals are given a pitch gradually decreasing from the inlet towards the outlet end.
  • the pitch of the spiral may increase from the inlet towards the outlet, thereby gradually increasing the section of the chamber between the two screws.
  • the apparatus is either heated or cooled, depending upon the nature of the material treated.
  • Figure 1 is an axial view of the inner conical helix
  • Figure 2 is an axial section of the outer conical helix
  • Figure 3 is a sectional View of the assembled apparatus with the members adapted to impart the above described movement to the inner and outer element, respectively.
  • Fig. 4 is a partial section of Fig. 3 on line IV-IV.
  • l denotes the inner conical helix and 2 the outer casing of the apparatus in which the outer conical helix 3 is formed, having on each winding the same pitch as the inner helix I, but of a larger diameter, the difference 3a between the two diameters being twice the eccentricity of the movement of the element I with respect to the element 2.
  • the inner helix I is in the position in which its turns are in contact with those of the outer helix 2 along a stepped line (shown underneath the axis in the section plane in which the gure is drawn) whilst in the diametrically opposed position there is the largest section of the chamber C formed between the turns of the two elements I and 2;
  • the inner element I has a journal 4 the axis of which is indicated by X--X and on which the worm wheelV with an eccentric axis Y-Y is mounted through a co-axial bushing 5, and receives motion through an endless screw 1, Figi 4.
  • the worm screw 6 is guided through the interposition of rollers 8 on the rings 9 and the axial thrust is supported by the disc I with the interposition of balls I I. Due to the eccentricity of the worm wheel 6 and its annular supports II with respect to the journal 4 on which said wheel is mounted, a movement parallel to itself is imparted to the journal 4, resulting in the displacement of its axis X-X about the axis Y-Y which brings about a similar movement of the inner conical helixfrI with respect to the element 2.
  • the material is fed into the inlet I2 and discharged through the drawing-die I3 formed in the casing 2 in its front portion, strongly compressed because of the rapid reduction of the helical chamber through which it is fed.
  • the apparatus is of extreme simplicity, since it consists of only three parts which are of simple construction and easily dis-assembled.
  • Apparatus for mixing and compressing plastic masses comprising an inner spiral member mountedV on a cylindrical journal, an outer spiral member having its turns equalling in axial extent associated turns of said inner member, the diameter of the turns of the inner member dii"- fering from the diameter of the associated 'turns 45 of the outer member by a constant value, means for holding the axis of said inner member parallel to the axis of the outer member, means for revolving the axis of said inner member about the axis of said outer member, so that each turn of the inner member constantly contacts along a line parallel to the axis of said member with the associated turn of the outer member, means for preventing rotation of the inner member about its own axis, the turns of said inner member coming progressively into contact with those of the outer member, thereby pushing forward and compressing the material entering at the outer periphery of the spiral of the outer member and issuing centrally at the front end thereof.
  • Apparatus for mixing and compressing plas; tic masses comprising an outer spiral member, a ring xed to said outer spiral member, a worm wheel mounted on said ring through the interposition of rollers, said worm wheel being eccentrically bored, means for actuating said worm wheel, a bush in the eccentric bore in said worm wheel, a cylindrical journal in said bush, an inner spiral member xed to said cylindrical pivot and having its turns equalling in axial extent the associated turns of said outer member, the diameter of the turns of the inner member diiering from the diameter of the associated turns of the outer member by a constant value, each turn of the inner member constantly contacting along a line parallel to the axis of said inner member with the associated turn of the outer member, means for preventing rotation of the inner member about its axis.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
US9581A 1944-02-15 1948-02-19 Apparatus for compressing thermoplastic masses Expired - Lifetime US2564880A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT250430X 1944-02-15

Publications (1)

Publication Number Publication Date
US2564880A true US2564880A (en) 1951-08-21

Family

ID=11215515

Family Applications (1)

Application Number Title Priority Date Filing Date
US9581A Expired - Lifetime US2564880A (en) 1944-02-15 1948-02-19 Apparatus for compressing thermoplastic masses

Country Status (7)

Country Link
US (1) US2564880A (enrdf_load_stackoverflow)
BE (1) BE478479A (enrdf_load_stackoverflow)
CH (1) CH250430A (enrdf_load_stackoverflow)
DE (1) DE879914C (enrdf_load_stackoverflow)
FR (1) FR958938A (enrdf_load_stackoverflow)
GB (1) GB628468A (enrdf_load_stackoverflow)
NL (1) NL68958C (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3046603A (en) * 1958-02-24 1962-07-31 Research Corp Method and apparatus for extrusion
US3304062A (en) * 1964-09-23 1967-02-14 Black Clawson Co Apparatus for mixing and compacting material

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE909395C (de) * 1951-11-22 1954-04-15 Basf Ag Mehrfachschneckenpresse zum Verarbeiten organischer plastischer Massen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1353917A (en) * 1915-10-09 1920-09-28 Frank B Lambert Brick machinery
US1904884A (en) * 1933-04-18 royle
US2343529A (en) * 1939-11-09 1944-03-07 Brown Frederick Edward Machine for extruding rubber and the like

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1904884A (en) * 1933-04-18 royle
US1353917A (en) * 1915-10-09 1920-09-28 Frank B Lambert Brick machinery
US2343529A (en) * 1939-11-09 1944-03-07 Brown Frederick Edward Machine for extruding rubber and the like

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3046603A (en) * 1958-02-24 1962-07-31 Research Corp Method and apparatus for extrusion
US3304062A (en) * 1964-09-23 1967-02-14 Black Clawson Co Apparatus for mixing and compacting material

Also Published As

Publication number Publication date
DE879914C (de) 1953-06-18
BE478479A (enrdf_load_stackoverflow) 1900-01-01
CH250430A (it) 1947-08-31
NL68958C (enrdf_load_stackoverflow) 1900-01-01
GB628468A (en) 1949-08-30
FR958938A (enrdf_load_stackoverflow) 1950-03-21

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