US2800162A - Continuous band heat sealing machine - Google Patents

Continuous band heat sealing machine Download PDF

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Publication number
US2800162A
US2800162A US392889A US39288953A US2800162A US 2800162 A US2800162 A US 2800162A US 392889 A US392889 A US 392889A US 39288953 A US39288953 A US 39288953A US 2800162 A US2800162 A US 2800162A
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Prior art keywords
heat sealing
belt
continuous band
sealing machine
band heat
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US392889A
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Howard A Rohdin
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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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83421—Roller, cylinder or drum types; Band or belt types; Ball types band or belt types
    • B29C66/83423—Roller, cylinder or drum types; Band or belt types; Ball types band or belt types cooperating bands or belts
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/14—Particular design of joint configurations particular design of the joint cross-sections the joint having the same thickness as the thickness of the parts to be joined
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects

Definitions

  • 'It is a further object of this invention to provide in a machine as aforesaid an improved band which will have a much longer life than those currently in use.
  • Figure *1 is a schematic view of a continuous band filler
  • FIG. 1 is an illustration of the convolute type of band herein contemplated
  • Figure 3 is a greatly enlarged view of the improved splice as originally formed.
  • Figure 4 is a view similar to Figure 3 but showing the final condition of the splice.
  • a metal belt passes around pulleys 12 and 14 and a second belt 16 passes around pulleys 18 and '20.
  • a heated jaw 22 presses against the inner side of the belt 10 and is opposed by a heated jaw 24 pressing against the inner side of the belt 16.
  • the travel of the belts is in the direction of the arrow 26.
  • the heated jaws 22 and 24 are followed by a cooled jaw 28 pressing against the inside of the belt 10 and another cooled jaw 30 pressing against the inside of the belt 16.
  • the material to be sealed is fed into the machine at 32.
  • the metal belts 10 and 16 transmit to this material the heat of the jaws 22 and 24, bringing the material to a sealing temperature. These belts then permit cooling by means of the jaws 28 and 30 to coalesce the seal.
  • the ideal caliper of the steel belts is .006 inch and heretofore the belts have been formed by butt-welding the ends of such a strip of steel.
  • Such butt-welds do not stand up under the flexing involved in going around the pulleys with the result that frequent shutdowns have been necessary in order to re-weld the belts. It has also been attempted to overlap the ends and spot weld them. This, however, produces a lump of .012 inch caliper which can be very objectionable in the sealing of homogenous films.
  • FIG. 2 The primary basis of the present invention is illustrated in Figure 2 in which a strip of steel 40 is convolutely 2 wound to bring one end 42 on the inside and the opposite end 44 on the outside.
  • This strip is made one-half the usual thickness, say, .003 inch.
  • the ends 42 and 44 therefore lie on opposite sides of a portion 46 of the strip 40.
  • the ends 42 and 44 are slightly spaced apart along the portion 46.
  • the end 44 is spot welded at 48 to the portion 46 while the end 42 is spot welded at 50 to the portion 46.
  • a filling of high melting point solder 52 forms a bevel from the upper edge of the end 44 to the surface of the portion 46 and the upper surface of the solder 52 meets the surface 46 at a point adjacent the extremity of the end 42.
  • a similar body of high melting point solder 54 extends from the outer corner of the end 42 and meets the inner side of the strip 46 adjacent the extremity of the end 44. Additional spot Welds may be made between the plies at various points around its circumference.
  • the splice illustrated in Figure 3 may be pressed to the condition illustrated in Figure 4 but in many cases this will not be necessary since the splice would assume the form of Figure 4 after a short period of actual use on the machine illustrated in Figure 1.
  • a heat sealing machine comprising: opposed pairs of pulleys; a pair of belts each passing around one pair of pulleys to define a work sealing path; heated jaws pressed against opposite sides of said belts adjacent the entering end of said path; cooling jaws pressed against opposite sides of said belts adjacent the exit end of said path, each of said belts comprising a convolution of thin sheet metal having its ends juxtaposed and secured to opposite sides of the adjacent body of the belt.
  • a flexible, power-delivering belt comprising a. narrow strip of thin sheetmetal convolutely wound with the convolutions in intimate contact, the ends of said strip being juxtaposed on opposite sides of the body of the strip and being secured thereto.
  • a belt as set forth in claim 3 in which a body of solder tapers from each of said ends to the adjacent surface of the belt.

Description

21 1957 H A. ROHDIN 2,800,162
CONTINUOUS-BAND HEAT SEALING momma Filed "Nov. 1a, 1953 EL g. 4
INVENTQR BY W ATTORNEY United States Patent.
2,800,162 CONTINUOUS BAND HEAT SEALING MACHINE Howard A. Rohdirl, Glen Ridge, N. J. Application November 18, 1953, Serial No. 392,889 Claims. (Cl. 154-42) It is an object of this invention to provide an improved heat sealing machine of the type known in the trade as a continuous band sealer.
'It is a further object of this invention to provide in a machine as aforesaid an improved band which will have a much longer life than those currently in use.
It is a further object of this invention to provide an improved form of splice in a band as aforesaid, which form of splice contributes greatly to the improved results aforesaid.
The above and other objects will be made clear from the following detailed description taken in connection with the annexed drawings, in which:
Figure *1 is a schematic view of a continuous band filler;
Figure 2 is an illustration of the convolute type of band herein contemplated;
Figure 3 is a greatly enlarged view of the improved splice as originally formed; and
Figure 4 is a view similar to Figure 3 but showing the final condition of the splice.
Subject to numerous mechanical variations the fundamentals of the continuous band sealer are illustrated in Figure l in which a metal belt passes around pulleys 12 and 14 and a second belt 16 passes around pulleys 18 and '20. A heated jaw 22 presses against the inner side of the belt 10 and is opposed by a heated jaw 24 pressing against the inner side of the belt 16. The travel of the belts is in the direction of the arrow 26. The heated jaws 22 and 24 are followed by a cooled jaw 28 pressing against the inside of the belt 10 and another cooled jaw 30 pressing against the inside of the belt 16. The material to be sealed is fed into the machine at 32. The metal belts 10 and 16 transmit to this material the heat of the jaws 22 and 24, bringing the material to a sealing temperature. These belts then permit cooling by means of the jaws 28 and 30 to coalesce the seal.
For a variety of technical reasons which need not be stated here, it has been found that the ideal caliper of the steel belts is .006 inch and heretofore the belts have been formed by butt-welding the ends of such a strip of steel. Such butt-welds, however, do not stand up under the flexing involved in going around the pulleys with the result that frequent shutdowns have been necessary in order to re-weld the belts. It has also been attempted to overlap the ends and spot weld them. This, however, produces a lump of .012 inch caliper which can be very objectionable in the sealing of homogenous films.
The primary basis of the present invention is illustrated in Figure 2 in which a strip of steel 40 is convolutely 2 wound to bring one end 42 on the inside and the opposite end 44 on the outside. This strip is made one-half the usual thickness, say, .003 inch. The ends 42 and 44 therefore lie on opposite sides of a portion 46 of the strip 40.
Referring now to Figure 3 it will be noted that the ends 42 and 44 are slightly spaced apart along the portion 46. The end 44 is spot welded at 48 to the portion 46 while the end 42 is spot welded at 50 to the portion 46. A filling of high melting point solder 52 forms a bevel from the upper edge of the end 44 to the surface of the portion 46 and the upper surface of the solder 52 meets the surface 46 at a point adjacent the extremity of the end 42. A similar body of high melting point solder 54 extends from the outer corner of the end 42 and meets the inner side of the strip 46 adjacent the extremity of the end 44. Additional spot Welds may be made between the plies at various points around its circumference.
If desired, the splice illustrated in Figure 3 may be pressed to the condition illustrated in Figure 4 but in many cases this will not be necessary since the splice would assume the form of Figure 4 after a short period of actual use on the machine illustrated in Figure 1.
In effect there are two splices each one-half the thickness of the conventional splice and since stresses induced in a rectangular section as a result of flexure vary as the cube of the thickness and Where, as here, the reduction is fifty percent, the maximum induced stress for a given flexure is only one-eighth that of the original belt. Accordingly, therefore, it becomes possible to reduce the diameter of the pulleys and therefore the overall size and cost of the'machine while still keeping maximum stress at a lower value than occurs in current practice or, conversely, retaining the same pulley diameter, the life of the belt and the splice is greatly increased.
What is claimed is:
1. A heat sealing machine comprising: opposed pairs of pulleys; a pair of belts each passing around one pair of pulleys to define a work sealing path; heated jaws pressed against opposite sides of said belts adjacent the entering end of said path; cooling jaws pressed against opposite sides of said belts adjacent the exit end of said path, each of said belts comprising a convolution of thin sheet metal having its ends juxtaposed and secured to opposite sides of the adjacent body of the belt.
2. For use on a heat sealing machine of the continuous band type, a flexible, power-delivering belt comprising a. narrow strip of thin sheetmetal convolutely wound with the convolutions in intimate contact, the ends of said strip being juxtaposed on opposite sides of the body of the strip and being secured thereto.
3. A belt as set forth in claim 2 in which the ends are secured by spot welding.
4. A belt as set forth in claim 3 in which a body of solder tapers from each of said ends to the adjacent surface of the belt.
5. A belt as set forth in claim 4 in which the convolutious are spot welded to each other at spaced points around the periphery of the belt.
References Cited in the file of this patent UNITED STATES PATENTS 2,429,119 Bloomfield Oct. 14, 1947 2,539,237 Dreyer Ian. 23, 1951 2,542,900 'Chaffee Feb. 20, 1951
US392889A 1953-11-18 1953-11-18 Continuous band heat sealing machine Expired - Lifetime US2800162A (en)

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Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2893468A (en) * 1955-08-31 1959-07-07 William R Fieroh Plastic heat-sealing apparatus
US2908320A (en) * 1954-12-08 1959-10-13 Howard A Rohdin Apparatus for heat sealing
US2941576A (en) * 1954-12-16 1960-06-21 Pfaff Ag G M Apparatus for continuous heat-sealing
US2952578A (en) * 1956-01-10 1960-09-13 Monsanto Chemicals Heat sealing method
US2975824A (en) * 1953-01-19 1961-03-21 G M Pfaff A G Kaiserslautern P Device for seam welding thermoplastic synthetic materials
DE1105602B (en) * 1959-03-18 1961-04-27 Norddeutsche Seekabelwerke Ag Method and device for welding a tubular network made of thermoplastic material in the manufacture of bags and the like. like
US2987106A (en) * 1957-09-04 1961-06-06 Amsco Packaging Machinery Inc Method and machine for forming edge seals on bags
US3031364A (en) * 1958-12-11 1962-04-24 Raybestos Manhattan Inc Methods of making extra-large sized flat and endless rubber belts
US3128484A (en) * 1961-09-08 1964-04-14 Reece Folding Machine Co Machine for making flexible book covers or similar articles
US3140971A (en) * 1962-03-14 1964-07-14 Package Machinery Co Heat sealing channel
US3148269A (en) * 1962-08-22 1964-09-08 Hoover Ball & Bearing Co Heater for continuous molding machine
DE1223532B (en) * 1962-09-15 1966-08-25 Heimbach Gmbh Thomas Josef Continuously working plastic film welding machine
US3345237A (en) * 1960-06-16 1967-10-03 Gen Foods Corp Apparatus for attaching a backing to a fibrous body
US3367261A (en) * 1965-08-16 1968-02-06 Kashiwagi Kimifumi Apparatus for continuous heat-sealing of thermoplastic sheets
US3461017A (en) * 1965-02-19 1969-08-12 Basf Ag Apparatus for the production of welded bags from thermoplastic tubular sheeting by means of radiant heat
US3488244A (en) * 1965-01-21 1970-01-06 Albemarle Paper Mfg Co Heat sealing apparatus
US3527633A (en) * 1965-02-22 1970-09-08 Centra Anstalt Machine for the automatic controlled manufacture and output of plastic bags
US3547742A (en) * 1967-02-23 1970-12-15 Us Plywood Champ Papers Inc Laminator apparatus
US3791162A (en) * 1972-07-13 1974-02-12 Npi Corp Double belt freezing machine
US3833440A (en) * 1972-06-06 1974-09-03 Tomoku Kk Method of making hollow planar board of synthetic resin material
US4259143A (en) * 1978-12-01 1981-03-31 General Binding Corporation Laminating machine
US5558016A (en) * 1987-06-15 1996-09-24 Firma Theodor Hymmen Arrangement for applying a surface pressure to workpieces driven by a pressing band
US5715647A (en) * 1994-11-02 1998-02-10 Rovema Verpackungsmaschinen Gmbh Device for the formation of a longitudinal seam of a tubular foil
US6050055A (en) * 1998-08-21 2000-04-18 Westvaco Corporation Apparatus and method for sealing of paperboard containers using induction heated metal bands
US6213010B1 (en) * 1999-01-18 2001-04-10 Pierluigi Bolzoni Wood sheet heat treatment method and plant
US6221798B1 (en) 1997-07-24 2001-04-24 International Paper Company Method for producing laminated webs
WO2006003524A3 (en) * 2004-06-30 2006-06-15 Ideepak Holding Bv Sealing device for heat sealing film material, and circulating belt suitable for advancing film material
US20150119218A1 (en) * 2013-10-31 2015-04-30 Tipper Tie, Inc. Systems with pre-heaters for producing seamed encased products and related devices, methods and computer program products
US11110666B2 (en) 2018-02-12 2021-09-07 Tipper Tie, Inc. Systems with external heat-seal assembly height adjustment control and related seal assemblies

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429119A (en) * 1943-08-16 1947-10-14 Lockheed Aircraft Corp Power transmission
US2539237A (en) * 1945-02-02 1951-01-23 Metallschlauchfabrik Ag Method of making interleaved tubes
US2542900A (en) * 1947-01-22 1951-02-20 Ralph W Chaffee Package closing and sealing machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429119A (en) * 1943-08-16 1947-10-14 Lockheed Aircraft Corp Power transmission
US2539237A (en) * 1945-02-02 1951-01-23 Metallschlauchfabrik Ag Method of making interleaved tubes
US2542900A (en) * 1947-01-22 1951-02-20 Ralph W Chaffee Package closing and sealing machine

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2975824A (en) * 1953-01-19 1961-03-21 G M Pfaff A G Kaiserslautern P Device for seam welding thermoplastic synthetic materials
US2908320A (en) * 1954-12-08 1959-10-13 Howard A Rohdin Apparatus for heat sealing
US2941576A (en) * 1954-12-16 1960-06-21 Pfaff Ag G M Apparatus for continuous heat-sealing
US2893468A (en) * 1955-08-31 1959-07-07 William R Fieroh Plastic heat-sealing apparatus
US2952578A (en) * 1956-01-10 1960-09-13 Monsanto Chemicals Heat sealing method
US2987106A (en) * 1957-09-04 1961-06-06 Amsco Packaging Machinery Inc Method and machine for forming edge seals on bags
US3031364A (en) * 1958-12-11 1962-04-24 Raybestos Manhattan Inc Methods of making extra-large sized flat and endless rubber belts
DE1105602B (en) * 1959-03-18 1961-04-27 Norddeutsche Seekabelwerke Ag Method and device for welding a tubular network made of thermoplastic material in the manufacture of bags and the like. like
US3345237A (en) * 1960-06-16 1967-10-03 Gen Foods Corp Apparatus for attaching a backing to a fibrous body
US3128484A (en) * 1961-09-08 1964-04-14 Reece Folding Machine Co Machine for making flexible book covers or similar articles
US3140971A (en) * 1962-03-14 1964-07-14 Package Machinery Co Heat sealing channel
US3148269A (en) * 1962-08-22 1964-09-08 Hoover Ball & Bearing Co Heater for continuous molding machine
DE1223532B (en) * 1962-09-15 1966-08-25 Heimbach Gmbh Thomas Josef Continuously working plastic film welding machine
US3488244A (en) * 1965-01-21 1970-01-06 Albemarle Paper Mfg Co Heat sealing apparatus
US3461017A (en) * 1965-02-19 1969-08-12 Basf Ag Apparatus for the production of welded bags from thermoplastic tubular sheeting by means of radiant heat
US3527633A (en) * 1965-02-22 1970-09-08 Centra Anstalt Machine for the automatic controlled manufacture and output of plastic bags
US3367261A (en) * 1965-08-16 1968-02-06 Kashiwagi Kimifumi Apparatus for continuous heat-sealing of thermoplastic sheets
US3547742A (en) * 1967-02-23 1970-12-15 Us Plywood Champ Papers Inc Laminator apparatus
US3833440A (en) * 1972-06-06 1974-09-03 Tomoku Kk Method of making hollow planar board of synthetic resin material
US3791162A (en) * 1972-07-13 1974-02-12 Npi Corp Double belt freezing machine
US4259143A (en) * 1978-12-01 1981-03-31 General Binding Corporation Laminating machine
US5558016A (en) * 1987-06-15 1996-09-24 Firma Theodor Hymmen Arrangement for applying a surface pressure to workpieces driven by a pressing band
US5715647A (en) * 1994-11-02 1998-02-10 Rovema Verpackungsmaschinen Gmbh Device for the formation of a longitudinal seam of a tubular foil
US6221798B1 (en) 1997-07-24 2001-04-24 International Paper Company Method for producing laminated webs
US6050055A (en) * 1998-08-21 2000-04-18 Westvaco Corporation Apparatus and method for sealing of paperboard containers using induction heated metal bands
US6213010B1 (en) * 1999-01-18 2001-04-10 Pierluigi Bolzoni Wood sheet heat treatment method and plant
WO2006003524A3 (en) * 2004-06-30 2006-06-15 Ideepak Holding Bv Sealing device for heat sealing film material, and circulating belt suitable for advancing film material
US20150119218A1 (en) * 2013-10-31 2015-04-30 Tipper Tie, Inc. Systems with pre-heaters for producing seamed encased products and related devices, methods and computer program products
US11110666B2 (en) 2018-02-12 2021-09-07 Tipper Tie, Inc. Systems with external heat-seal assembly height adjustment control and related seal assemblies

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