US2972668A - Method and arrangement for uniformly heating a band-shaped material - Google Patents

Method and arrangement for uniformly heating a band-shaped material Download PDF

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Publication number
US2972668A
US2972668A US686059A US68605957A US2972668A US 2972668 A US2972668 A US 2972668A US 686059 A US686059 A US 686059A US 68605957 A US68605957 A US 68605957A US 2972668 A US2972668 A US 2972668A
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Prior art keywords
band
roller
arrangement
shaped material
temperature
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US686059A
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Westberg Johan Eric Haiden
Soderberg Leif Erik Roland
Bergstrom Axel Emil
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Svenska AB Gasaccumulator
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Svenska AB Gasaccumulator
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    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/12—Dielectric heating
    • B29C35/14—Dielectric heating for articles of indefinite length
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • 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
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • 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
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/44—Compression means for making articles of indefinite length
    • B29C43/46—Rollers
    • 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
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/52—Heating or cooling
    • 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
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/44—Compression means for making articles of indefinite length
    • B29C43/46—Rollers
    • B29C2043/461—Rollers the rollers having specific surface features
    • B29C2043/462—Rollers the rollers having specific surface features smooth surface
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
    • B29C33/04—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means using liquids, gas or steam
    • B29C33/046—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means using liquids, gas or steam using gas
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/20—Opening, closing or clamping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material

Definitions

  • the present invention comprises a method, the application of which is free from the said disadvantage.
  • the method of uniformly heating a band-shaped material according to the invention is characterized in that the material is wound onto a roller together with a band adapted to emit heat, one or more pressure rollers being pressed during at least part of the process with simultaneous rotation against the material wound on the roller.
  • the invention also refers to an arrangement for performing the method, the arrangement being characterized by a roller for winding up the material thereon and by one or more pressure rollers adapted to be pressed with simultaneous rotation against material wound on the roller.
  • the invention yields an essential advantage in that, owing to the roller action, the material is additionally stretched in heated condition, which causes lengthening of the most heavily loaded fibres thereof and an equalization of the fibre loading. This etfect can be enhanced through braking of the pressure rollers.
  • a material produced in this manner Will therefore be substantially stronger than if the production is performed in accordance with other, known methods. For instance, in a particular case, a value was obtained for the tensile strength of a neoprene-impregnated nylon fabric vulcanized according to the invention exceeding by 28% the value for the same fabric vulcanized according to a known method.
  • the invention further makes possible a simple solution of the problem of supplying current to the heating band during its movement.
  • the pressure rollers and the roller can serve to apply current to the band.
  • the pressure of the pressure rollers against the main roller yields satisfactory current passage when the .uninsulated ends make contact with the current-carrying rollers.
  • a further problem whose solution in a simple way is facilitated by the invention is the measurement of the temperature of the material Without using any temperatore-sensitive member producing dents in the material.
  • the temperature measurement suitably comprises measurement of the heating band temperature at the beginning of the process, when the band has a known temperature. Since the resistance increase of the band as a function of temperature is known, it is possible to ascertain by measurement of the resistance when temperature obtains and control the heat supply accordingly.
  • Figs. 1 and 2 An embodiment of the invention is described in the following in connection with Figs. 1 and 2, Fig. 1 showing an end view and Fig. 2 a side view of the arrangement with the band-shaped material rolled on.
  • 1 denotes the main roller on which the material 2 and the heating band 3 are wound.
  • pressure rollers 4 are pressed with the aid of pneumatic pressure cylinders 5 and levers 6.
  • the rollers are surrounded by an insulating cover 7, the air in which is held at the same temperature as the heating band by means of heat radiators 8 and fans 9.
  • Current is supplied to the rollers 1 and 4 by means of sliding contacts 10 and 11 and the resistance of the band is measured with a measuring instrument 12.
  • a driving device 13 for driving the main roller is adjustable with regard to speed and direction.
  • the pressure rollers can be braked by means of brake members 14 having controllable braking moment.
  • the material and the; resistive band are wound onto the roller 1 and the pressure rollers 4 are pressed against the roll thus formed.
  • the cover 7 is closed and current is supplied to the band 3 as well as the resistors 8.
  • the instrument 12 yields continual information about the temperature of the roller and the current through the resistor 8 is adjusted so as to make the air temperature Within the cover reach the same value.
  • the current supply to the band is interrupted and there is then supplied to the resistors 8 only as much current as is required for maintaining the air temperature within the casing.
  • the band-shaped material and the heating band are wound oil? with simultaneous cooling onto different rollers.
  • the pressure exerted by the pressure rollers during the operation should be different for different materials and can be varied by control of the pressure applied to the cylinders 5. If extraordinarily heavy stretching of the material is desired, the brakes 14 are tightened.
  • Apparatus for uniformly heating band-shaped material comprising a first roller mounted for rotation, a band adapted to emit heat and wound in inter-engage ment with said material in a plurality of turns on said first roller, at least one second roller mounted adjacent said first roller and in pressure engagement with said material, and means for producing heat in said band.
  • Apparatus for uniformly heating band-shaped material comprising a first roller mounted for rotation, a band adapted to emit heat and wound in inter-engagement with said material about said first roller, at least one second roller mounted adjacent said first roller and in pressure engagement with said material, and means for producing heat in said band, said band and at least one of said rollers being electrically conductive, said band engaging said conductive roller, and said producing means including means for conveying electric current to said conductive roller.
  • Apparatus according to claim 1 further comprising a casing in which said rollers are mounted, and means for heating said casing.
  • Apparatus according to claim 3 further comprising means for controlling the temperature attained in said band, whereby a cooperative relationship between said temperature and that in said casing can be attained.
  • a method of uniformly heating a band-shaped material comprising winding said material together with a band adapted to emit heat onto a first roller so as to form a roll thereon, pressure engaging said roll with at least one second roller, and producing heat in said band While rotating said first roller with said roll formed thereon.
  • a method according to claim 6 further comprising heating the air surrounding said material.
  • a method according to claim 8 further comprising controlling the temperature attained in said band commensurate with that of said air.

Description

1961 J. E. H. WESTBERG ETAL 2,972,668
METHOD AND ARRANGEMENT FOR UNIFORMLY HEATING A BAND-SHAPED MATERIAL Filed Sept. 25, 1957 INVENTOR5 Jay/71v 54 1c HI/AEV WESTEEFG ATTORNEY United States Patent NIETHOD AND ARRANGEMENT FOR UNIFORMLY HEATING A BAND-SHAPED MATERIAL Filed Sept. 25, 1957, Ser. No. 686,059
Claims priority, application Sweden Oct. 9, 1956 Claims. (Cl. 219-19) It has been proposed to produce material in band shape which require a heat treatment for their production by winding the material on a roller together with a heat-emitting hand, through whose heat emission the whole roll is brought to the temperature required for the process.
In the application of these methods on rubber-like material there has appeared to be risk of the creation of bubbles or porosity in the material owing to the fact that some solvent is'transferred during the process into gaseous form and remains in the material.
The present invention comprises a method, the application of which is free from the said disadvantage. The method of uniformly heating a band-shaped material according to the invention is characterized in that the material is wound onto a roller together with a band adapted to emit heat, one or more pressure rollers being pressed during at least part of the process with simultaneous rotation against the material wound on the roller.
The invention also refers to an arrangement for performing the method, the arrangement being characterized by a roller for winding up the material thereon and by one or more pressure rollers adapted to be pressed with simultaneous rotation against material wound on the roller.
The invention yields an essential advantage in that, owing to the roller action, the material is additionally stretched in heated condition, which causes lengthening of the most heavily loaded fibres thereof and an equalization of the fibre loading. This etfect can be enhanced through braking of the pressure rollers. A material produced in this manner Will therefore be substantially stronger than if the production is performed in accordance with other, known methods. For instance, in a particular case, a value was obtained for the tensile strength of a neoprene-impregnated nylon fabric vulcanized according to the invention exceeding by 28% the value for the same fabric vulcanized according to a known method.
The invention further makes possible a simple solution of the problem of supplying current to the heating band during its movement. By making the two ends of the band have no insulation and constructing the roller and the pressure rollers of metallic material and with good contact properties, the pressure rollers and the roller can serve to apply current to the band. The pressure of the pressure rollers against the main roller yields satisfactory current passage when the .uninsulated ends make contact with the current-carrying rollers.
A further problem whose solution in a simple way is facilitated by the invention is the measurement of the temperature of the material Without using any temperatore-sensitive member producing dents in the material. The temperature measurement suitably comprises measurement of the heating band temperature at the beginning of the process, when the band has a known temperature. Since the resistance increase of the band as a function of temperature is known, it is possible to ascertain by measurement of the resistance when temperature obtains and control the heat supply accordingly.
An embodiment of the invention is described in the following in connection with Figs. 1 and 2, Fig. 1 showing an end view and Fig. 2 a side view of the arrangement with the band-shaped material rolled on.
In the figures, 1 denotes the main roller on which the material 2 and the heating band 3 are wound. Against the roll thus formed, pressure rollers 4 are pressed with the aid of pneumatic pressure cylinders 5 and levers 6. The rollers are surrounded by an insulating cover 7, the air in which is held at the same temperature as the heating band by means of heat radiators 8 and fans 9. Current is supplied to the rollers 1 and 4 by means of sliding contacts 10 and 11 and the resistance of the band is measured with a measuring instrument 12. A driving device 13 for driving the main roller is adjustable with regard to speed and direction. The pressure rollers can be braked by means of brake members 14 having controllable braking moment.
At the beginning of a work cycle, the material and the; resistive band are wound onto the roller 1 and the pressure rollers 4 are pressed against the roll thus formed. When the material has been wound on, the cover 7 is closed and current is supplied to the band 3 as well as the resistors 8. The instrument 12 yields continual information about the temperature of the roller and the current through the resistor 8 is adjusted so as to make the air temperature Within the cover reach the same value. When the desired working temperature has been reached, the current supply to the band is interrupted and there is then supplied to the resistors 8 only as much current as is required for maintaining the air temperature within the casing. When the heat treatment is finished, the band-shaped material and the heating band are wound oil? with simultaneous cooling onto different rollers. The pressure exerted by the pressure rollers during the operation should be different for different materials and can be varied by control of the pressure applied to the cylinders 5. If extraordinarily heavy stretching of the material is desired, the brakes 14 are tightened.
What is claimed is:
1. Apparatus for uniformly heating band-shaped material comprising a first roller mounted for rotation, a band adapted to emit heat and wound in inter-engage ment with said material in a plurality of turns on said first roller, at least one second roller mounted adjacent said first roller and in pressure engagement with said material, and means for producing heat in said band.
2. Apparatus for uniformly heating band-shaped material comprising a first roller mounted for rotation, a band adapted to emit heat and wound in inter-engagement with said material about said first roller, at least one second roller mounted adjacent said first roller and in pressure engagement with said material, and means for producing heat in said band, said band and at least one of said rollers being electrically conductive, said band engaging said conductive roller, and said producing means including means for conveying electric current to said conductive roller.
3. Apparatus according to claim 1 further comprising a casing in which said rollers are mounted, and means for heating said casing.
4. Apparatus according to claim 3 further comprising means for controlling the temperature attained in said band, whereby a cooperative relationship between said temperature and that in said casing can be attained.
5. Apparatus according to claim 2 wherein said second roller is rotatab-ly mounted, and means is provided for braking one of said rollers at a predetermined time, whereby said material is further elongated.
6. A method of uniformly heating a band-shaped material, comprising winding said material together with a band adapted to emit heat onto a first roller so as to form a roll thereon, pressure engaging said roll with at least one second roller, and producing heat in said band While rotating said first roller with said roll formed thereon.
7. A method according to claim 6 wherein said band and at least one of said rollers is electrically conductive, and heat is produced in said band by passing electric current thereto through said conductive roller.
8. A method according to claim 6 further comprising heating the air surrounding said material.
9. A method according to claim 8 further comprising controlling the temperature attained in said band commensurate with that of said air.
10. A method according to claim 6 wherein said second roller is also rotated and further comprising braking said second roller at predetermined times to further elongate said material.
References Cited in the file of this patent UNITED STATES PATENTS 1,275,785 Stratton Aug. 13, 1918 1,401,303 Baldwin Dec. 27, 1921 1,941,362 Newcomb Dec. 26, 1933 2,226,315 Mailander Dec. 24, 1940 2,525,356 Hoyler Oct. 10, 1950 2,556,008 Spalding June 5, 1951 2,589,777 Collins Mar. 18, 1952 2,629,808 Ulmschneider Feb. 24, 1953 2,649,530 Dietz Aug. 18, 1953 2,763,893 Hall Sept. 25, 1956
US686059A 1956-10-09 1957-09-25 Method and arrangement for uniformly heating a band-shaped material Expired - Lifetime US2972668A (en)

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SE2972668X 1956-10-09

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CH (1) CH356905A (en)
DK (1) DK97664C (en)
FR (1) FR1183692A (en)
GB (1) GB820602A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3523356A (en) * 1968-07-22 1970-08-11 Hooker Chemical Corp Method for installing thermoplastic material
US4791275A (en) * 1986-04-07 1988-12-13 Imi-Tech Corporation High temperature compliant roll particularly adapted for xerography
CN107411178A (en) * 2017-08-28 2017-12-01 云南中烟工业有限责任公司 A kind of smoking device of low temperature cigarette and preparation method thereof

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1275785A (en) * 1915-11-09 1918-08-13 Electric Controller & Mfg Co Resistance unit.
US1401303A (en) * 1919-01-20 1921-12-27 Baldwin William Charles Electrical drier for paper and the like
US1941362A (en) * 1931-10-12 1933-12-26 Carborundum Co Apparatus for drying freshly frinted webs
US2226315A (en) * 1938-07-19 1940-12-24 Mailander Willy Rotary sheet metal offset printing press
US2525356A (en) * 1943-02-27 1950-10-10 Rca Corp Apparatus for bonding material electrically
US2556008A (en) * 1948-12-28 1951-06-05 William F Stahl Plastic-sealing apparatus
US2589777A (en) * 1949-07-09 1952-03-18 William F Stahl Plastic-sealing apparatus
US2629808A (en) * 1950-11-15 1953-02-24 Eastman Kodak Co Apparatus for sealing wrapping material
US2649530A (en) * 1950-09-06 1953-08-18 Edison Inc Thomas A Radiant heating system
US2763893A (en) * 1950-08-02 1956-09-25 Molins Machine Co Ltd Embossing gear for foil or other material

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1275785A (en) * 1915-11-09 1918-08-13 Electric Controller & Mfg Co Resistance unit.
US1401303A (en) * 1919-01-20 1921-12-27 Baldwin William Charles Electrical drier for paper and the like
US1941362A (en) * 1931-10-12 1933-12-26 Carborundum Co Apparatus for drying freshly frinted webs
US2226315A (en) * 1938-07-19 1940-12-24 Mailander Willy Rotary sheet metal offset printing press
US2525356A (en) * 1943-02-27 1950-10-10 Rca Corp Apparatus for bonding material electrically
US2556008A (en) * 1948-12-28 1951-06-05 William F Stahl Plastic-sealing apparatus
US2589777A (en) * 1949-07-09 1952-03-18 William F Stahl Plastic-sealing apparatus
US2763893A (en) * 1950-08-02 1956-09-25 Molins Machine Co Ltd Embossing gear for foil or other material
US2649530A (en) * 1950-09-06 1953-08-18 Edison Inc Thomas A Radiant heating system
US2629808A (en) * 1950-11-15 1953-02-24 Eastman Kodak Co Apparatus for sealing wrapping material

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3523356A (en) * 1968-07-22 1970-08-11 Hooker Chemical Corp Method for installing thermoplastic material
US4791275A (en) * 1986-04-07 1988-12-13 Imi-Tech Corporation High temperature compliant roll particularly adapted for xerography
CN107411178A (en) * 2017-08-28 2017-12-01 云南中烟工业有限责任公司 A kind of smoking device of low temperature cigarette and preparation method thereof
CN107411178B (en) * 2017-08-28 2023-09-29 云南中烟工业有限责任公司 Smoke generating device of low-temperature cigarettes and manufacturing method thereof

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Publication number Publication date
DK97664C (en) 1964-01-06
FR1183692A (en) 1959-07-10
GB820602A (en) 1959-09-23
CH356905A (en) 1961-09-15

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