US2364009A - Method and means for making bags - Google Patents

Method and means for making bags Download PDF

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Publication number
US2364009A
US2364009A US465010A US46501042A US2364009A US 2364009 A US2364009 A US 2364009A US 465010 A US465010 A US 465010A US 46501042 A US46501042 A US 46501042A US 2364009 A US2364009 A US 2364009A
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Prior art keywords
tubes
roll
supporting roll
bags
heat
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US465010A
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Tessendorf Charles
Jr Frank J Gruper
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Marathon Corp
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Marathon Corp
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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
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/851—Bag or container making machines
    • B29C66/8511—Bag making machines
    • 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
    • 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
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/26—Hot fluid
    • 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
    • B29C66/03—After-treatments in the joint area
    • B29C66/034—Thermal after-treatments
    • B29C66/0342—Cooling, e.g. transporting through welding and cooling zone
    • 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
    • B29C66/40—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
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • 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
    • B29C66/81811—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 of the welding jaws
    • 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
    • B29C66/83431—Roller, cylinder or drum types; Band or belt types; Ball types rollers, cylinders or drums cooperating with bands or belts
    • B29C66/83433—Roller, cylinder or drum types; Band or belt types; Ball types rollers, cylinders or drums cooperating with bands or belts the contact angle between said rollers, cylinders or drums and said bands or belts being a non-zero angle
    • 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
    • B29C66/83431—Roller, cylinder or drum types; Band or belt types; Ball types rollers, cylinders or drums cooperating with bands or belts
    • B29C66/83435—Roller, cylinder or drum types; Band or belt types; Ball types rollers, cylinders or drums cooperating with bands or belts said rollers, cylinders or drums being hollow
    • 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
    • B29C35/16—Cooling
    • B29C2035/1616—Cooling using liquids
    • 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
    • B29C35/16—Cooling
    • B29C2035/1658—Cooling 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
    • 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
    • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B29C35/049—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using steam or damp
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/004—Closing bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure

Definitions

  • This invention relates to a method and means for heat sealing bags. More specifically this invention relates to providing an open-ended tube with a heat-sealed seam by suitable application of heat and controlled rolling pressure followed by subsequent chilling and setting of the seam under rolling pressure.
  • the dimculties hitherto encountered in forming effective heat-sealed seams have been successfully solved by carefully controlling the conditions and sequence of steps in forming the seams.
  • Figure l is a perspective view of the tube sealing unit
  • Figure 2 is an elevational view taken on lines 2-2 of Figure 1.
  • Figure 3 is a cross-sectional view taken on lines 33 of Figure 1,
  • Figure 4 is a sectional view taken on lines 44 of Figure 3,
  • Figure 5 is a sectional view of the heat-sealed tube taken along lines 5-5 of Figure l,
  • Figure 6 is a sectional view taken on lines 6-6 of Figure 2,
  • FIG. 7 is a sectional view taken on lines 1-! of Figure 2
  • Figure 8 is a perspective view of the tube before sealing one end thereof.
  • Figure 9 is a perspective view of the completed tube or bag, being partlycut away to show its sealed end.
  • Figure 8 illustrates a tube Ill open at both ends made from any suitable sheet material such as paper, glassine,
  • the tube may be formed in any suitable manner by any conventional apparatus such as, for example, by continuously folding a travelling web and sealing the overlapped portions by heat and pressure alone or by means of a suitable adhesive applied to the overlapped longitudinal margins. The continuous tube so formed is then cut into open-ended tubes In of suitable dimension as illustrated in Figure 8.
  • One end may be provided with a semi-circular cut-out portion l2 as a finger-grasping portion for facilitating opening of the tube after sealing same.
  • the longitudinal side margins I3 and ll of the tube may be subjected to heat and pressure to form autogenously sealed longitudinal seams in order to reinforce the tube at the lateral margins and to insure hermetic sealing of the contents.
  • a bottom seam HI is then formed as illustrated in Figure 9 in accordance with the present invention.
  • a spaced series of tubes ID are continuously fed to the sealing mechanism illustrated in Figure 1 forming the subject-matter of this inven-- tion.
  • the tubes l0 travel from the chute l6 onto an endless travelling conveyor belt l1 guided on rolls I8 and I9 supported in frame 20, moving in the direction of the arrows indicated in Figure 1.
  • the tubes l0 fall onto an endless travelling conveyor 25 guided over rolls 26 and 21 moving in the direction indicated by the arrows in Figure 1.
  • the bottom portion of the tubes l0 contact a guide bar 28 which guides the tubes into proper alignment with the bottom seam forming elements.
  • the guide bar 28 is slightly inclined, say about 2, toward the line of travel of the tubes III on conveyor 25.
  • the bottom seam forming elements comprise a large rotating supporting roll 30 on which a spaced series of the tubes ID are supported while travelling continuously.
  • Roll 30 is driven by motor I through belt 2 and shaft 3.
  • the tubes l0 leave the conveyor 25 they are guided by curved guide bar 29 and the bo'tom portions thereof which will form the seam 15 are brought successively into direct contact with roll 30 at which point endless belt 3
  • is supported on roll 60.
  • Roll 80 is chilled in any carrled'over rolls 32, 33 and 3
  • the bags Ill are then conveyed into contact with a chilled supporting roll with the seam portion l5 in direct contact with roll 60.
  • the bottom seams of the bags are retained under pressure against roll 60 by means of endless belt 6
  • is supported on rolls 52, 62 and 63.
  • Roll 62 is adjustably positioned so as to regulate the tension of belt 6
  • Pipes 11 and 13 are stationary and extend through the shaft 16 supporting roll '60.
  • Rolls 30 and 60 are preferably of the same diameter and are synchronousiy' driven by motor I through belts i andlasshowninligure 1.
  • Apparatus for formin bags from tubes of heat-scalable sheet material which comprises a heated supporting roll and a spaced chilled supporting roll, guide means for aligning One end of said tubes with the heated supporting roll, an endless belt coacting with the periphery of said supporting roll to flex and apply pressure to said tubes for forming a seam while carried on said supporting roll, a pair of endless travelling belts for receiving the tubes from said supporting roll and conveying said tubes to said chilled supporting roll, and an endless belt coacting with the periphery of said chilled roll to flex and apply pressure to said seams and convey the tubes on said supporting roll.
  • Apparatus for forming bags from tubes of heat-scalable sheet material which comprises a conveyor for continuously feeding a plurality of spaced tubes, a heated supporting roll and a spaced chilled supporting roll; guide means for aligning one end of said tubes with said heated supporting roll, an endless belt coacting with about half the periphery of said Supp rting roll to flex and apply pressure to said tubes for forming a seam while carried on said supporting roll, a pair of endless travelling belts for receiving the tubes from said supporting roll and conveyingsaid tubes to said chilled supporting roll, and an endless belt coacting with about half the pe- A riphery of said chilled roll to flex and apply pressure to said seams and convey the tubes on said supporting roll.
  • Apparatus for forming bags from tubes oi heat-scalable sheet material which comprises a conveyor for continuously feeding a plurality of spaced tubes, a heated supporting roll and a spaced chilled supporting roll, guide means for aligning one end of said tubes with said heated supporting roll, an endless belt coacting with the periphery of said supporting roll to flex and apply pressure to said tubes for iorming a seam while and convey the tubes on said supporting roll.
  • Apparatus for forming bags from tubes or .heat-sealable sheet material which comprises a.
  • conveyor for continuously feeding a plurality or spacedtubeaaheatedsupportingrollanda spaced chilled supporting roll, guide means for aligning one end of said'tubes with said heated mpporting roll, an endless belt coacting with the periphery of said supporting roll to flex and apcurrent of air against the seams while travelling plypnessuretosaidtubestoriorming-aseam while carried on said supporting roll, a pair oi endless travelling belts for receiving and engaging the body portion of the tubes from said supporting roll, and conveying said tubes to said chilled supporting roll, a blower for directing a with said pair of endless travelling belts, and an endless belt coacting with the periphery of said chilled roll to flex and apply pressure to said seams and convey thetubes on said supporting roll.
  • Apparatus for formin bags from "tubes of heat-scalable sheet material which comprises a conveyor for continuously feeding a plurality of spaced tubes, a heated supporting roll and a spaced chilled supporting roll, guide means for aligningoneendofsaidtubeswithsaidheated supporting roll, an endless belt coacting with about half the periphery of said supporting roll toflex andapply pressuretosaidtubes for formingaseamwhilecarriedonsaidsupporflngmil,

Description

1944- c. TESSENDORF ET AL 2,364,009
METHOD AND MEANS FOR MAKING BAGS Filed Nov. 9, 1942 5 Sheets-Sheet l a W L/r we Z M Nov. 28, 1944- c. TESSENDORF ET AL 2,364,009
7 METHOD AND MEANS FOR MAKING BAGS Filed Nov. 9, 1942 5 Sheets-Sheet 2 1944' C. TESSENDORF ET AL METHOD AND MEANS FOR MAKING BAGS 5 Sheeis-Sheet 3 Filed NOV. 9, 1942 y 9 W 5 m m3 2 a 4 [11'] 35; 2 f 0 "m Q M m ,7 :r E 9 w Patented Nov. 28, 1944 METHOD AND MEANS FOR MAKING BAGS Charles Tessendorf, Neenah, and Frank J.
Gruper, In,
Menasha,
With, assignors to Marathon Corporation, a corporation of Wisconsin Application November 9, 1942, Serial No. 465,016
6 Claims.
This invention relates to a method and means for heat sealing bags. More specifically this invention relates to providing an open-ended tube with a heat-sealed seam by suitable application of heat and controlled rolling pressure followed by subsequent chilling and setting of the seam under rolling pressure.
The packaging of dehydrated foods and other substances in non-metallic containers has been widely adopted recently owing to the convenience and efliciency of such packaging. In order to prevent access of moisture to the contents in such packages which will cause deterioration of the contents, it has been found that the packages must be securely and hermetically sealed. In making such packages from tubes or envelopes the production of seams which will not open or permit access of air and moisture to the contents has. presented many difiiculties, particularly when the tubes are formed from sheet materials coated with a heat-scalable composition so as to permit formation of seams autogenously by applying heat and pressure to the portions to be sealed.
According to the present invention the dimculties hitherto encountered in forming effective heat-sealed seams have been successfully solved by carefully controlling the conditions and sequence of steps in forming the seams.
Further details of the invention will be more fully explained by reference to the drawings and specification.
Figure l is a perspective view of the tube sealing unit,
Figure 2 is an elevational view taken on lines 2-2 of Figure 1.
Figure 3 is a cross-sectional view taken on lines 33 of Figure 1,
Figure 4 is a sectional view taken on lines 44 of Figure 3,
Figure 5 is a sectional view of the heat-sealed tube taken along lines 5-5 of Figure l,
Figure 6 is a sectional view taken on lines 6-6 of Figure 2,
Figure 7 is a sectional view taken on lines 1-! of Figure 2,
Figure 8 is a perspective view of the tube before sealing one end thereof, and
Figure 9 is a perspective view of the completed tube or bag, being partlycut away to show its sealed end.
Referring to the drawings, Figure 8 illustrates a tube Ill open at both ends made from any suitable sheet material such as paper, glassine,
Cellophane (regenerated cellulose), ethyl cellulose, cellulose acetate and the like and coated with a suitable heat-scalable coating on both surfaces or at least on its inner surface II which will form an autogenous seal by application of heat 'and pressure. Suitable coating compositions for this purpose are, for example, disclosed in Patent Nos. 1,997,583 and 2,054,113. Any other suitable and available heat-sealable sheets may be utilized. The tube may be formed in any suitable manner by any conventional apparatus such as, for example, by continuously folding a travelling web and sealing the overlapped portions by heat and pressure alone or by means of a suitable adhesive applied to the overlapped longitudinal margins. The continuous tube so formed is then cut into open-ended tubes In of suitable dimension as illustrated in Figure 8. One end may be provided with a semi-circular cut-out portion l2 as a finger-grasping portion for facilitating opening of the tube after sealing same. The longitudinal side margins I3 and ll of the tube may be subjected to heat and pressure to form autogenously sealed longitudinal seams in order to reinforce the tube at the lateral margins and to insure hermetic sealing of the contents. A bottom seam HI is then formed as illustrated in Figure 9 in accordance with the present invention.
A spaced series of tubes ID are continuously fed to the sealing mechanism illustrated in Figure 1 forming the subject-matter of this inven-- tion. The tubes l0 travel from the chute l6 onto an endless travelling conveyor belt l1 guided on rolls I8 and I9 supported in frame 20, moving in the direction of the arrows indicated in Figure 1. As theconveyor passes over roll l9 the tubes l0 fall onto an endless travelling conveyor 25 guided over rolls 26 and 21 moving in the direction indicated by the arrows in Figure 1. The bottom portion of the tubes l0 contact a guide bar 28 which guides the tubes into proper alignment with the bottom seam forming elements. The guide bar 28 is slightly inclined, say about 2, toward the line of travel of the tubes III on conveyor 25.
The bottom seam forming elements comprise a large rotating supporting roll 30 on which a spaced series of the tubes ID are supported while travelling continuously. Roll 30 is driven by motor I through belt 2 and shaft 3. As the tubes l0 leave the conveyor 25 they are guided by curved guide bar 29 and the bo'tom portions thereof which will form the seam 15 are brought successively into direct contact with roll 30 at which point endless belt 3| engages the successive tubes ill and carries them under rolling to control the pressure applied to the bags II pressure into contact with roll 30. Belt 3| is supported on roll 60. Roll 80 is chilled in any carrled'over rolls 32, 33 and 3| which are posiplied to the bottom portion of tube it for forming on eutogenousiy welded bottom seen It.
on the seams by means of pressure roll it which is adjustably positioned so as to apply predetermined pressure directly on belt 3| which in turn is firmly pressed against roll 30. Roll 35 is positioned about the middle of the arc of travel or the tubes III on roll 30. The roll 30 is heated in any suitable manner. As shown in F'lgure '7, an internal arcuate stea'm jet 40 is provided internally 01 the roll 30 and steam is supplied to the j at through tube 1 l extent ding con- shaft 45. e out. through pi e .2 exaft the en or the 1 111g cnt1nu r a su.
re to body ortion of me tu 1s engage-a by 003. travelling belts so and I Belt is guided 5 1' rolls 34 and 52 and belt 5| is guided over rolls 5i and ii in the direction of the arrows as shown in Figure 2. The seam portion I5 01 the bags I'll is not engaged by belts 50 and 5| but extends freely and uncontacted beyond the belts during travel therebetween in the relation shown in Figures 1 and 4. A blast of cold air is supplied by a blower 55 to chill the seam portion during this portion of the travel, but without application of any pressure thereto. During travel of the bags between belts 50 and 5| the bags are flattened into substantially fiat planar condition.
The bags Ill are then conveyed into contact with a chilled supporting roll with the seam portion l5 in direct contact with roll 60. The bottom seams of the bags are retained under pressure against roll 60 by means of endless belt 6| travelling in the direction of the arrows shown in Figure 2 coacting with about half of the periphery of roll 60. Belt 6| is supported on rolls 52, 62 and 63. Roll 62 is adjustably positioned so as to regulate the tension of belt 6| in Order suitable manner such as by cold circulating water which is sprayed internally as shown in Figure 6. Cold water enters through pipe Ill and es. capes through sprayhead 12. The water is with.
I drawn through tube 13 by a suction pump. Pipes 11 and 13 are stationary and extend through the shaft 16 supporting roll '60. Rolls 30 and 60 are preferably of the same diameter and are synchronousiy' driven by motor I through belts i andlasshowninligure 1.
and the adhesive finally set or congealed while subjected to rolling pressure and cold as they mechanism for Lung the with any After flnm formin n3 the tubes in an cuaee con- 8 and. app yin pre ure thereto to set the Sald scams.
2. Apparatus for formin bags from tubes of heat-scalable sheet material which comprises a heated supporting roll and a spaced chilled supporting roll, guide means for aligning One end of said tubes with the heated supporting roll, an endless belt coacting with the periphery of said supporting roll to flex and apply pressure to said tubes for forming a seam while carried on said supporting roll, a pair of endless travelling belts for receiving the tubes from said supporting roll and conveying said tubes to said chilled supporting roll, and an endless belt coacting with the periphery of said chilled roll to flex and apply pressure to said seams and convey the tubes on said supporting roll.
3. Apparatus for forming bags from tubes of heat-scalable sheet material which comprises a conveyor for continuously feeding a plurality of spaced tubes, a heated supporting roll and a spaced chilled supporting roll; guide means for aligning one end of said tubes with said heated supporting roll, an endless belt coacting with about half the periphery of said Supp rting roll to flex and apply pressure to said tubes for forming a seam while carried on said supporting roll, a pair of endless travelling belts for receiving the tubes from said supporting roll and conveyingsaid tubes to said chilled supporting roll, and an endless belt coacting with about half the pe- A riphery of said chilled roll to flex and apply pressure to said seams and convey the tubes on said supporting roll.
4. Apparatus for forming bags from tubes oi heat-scalable sheet material which comprises a conveyor for continuously feeding a plurality of spaced tubes, a heated supporting roll and a spaced chilled supporting roll, guide means for aligning one end of said tubes with said heated supporting roll, an endless belt coacting with the periphery of said supporting roll to flex and apply pressure to said tubes for iorming a seam while and convey the tubes on said supporting roll.
5. Apparatus for forming bags from tubes or .heat-sealable sheet material which comprises a.
conveyor for continuously feeding a plurality or spacedtubeaaheatedsupportingrollanda spaced chilled supporting roll, guide means for aligning one end of said'tubes with said heated mpporting roll, an endless belt coacting with the periphery of said supporting roll to flex and apcurrent of air against the seams while travelling plypnessuretosaidtubestoriorming-aseam while carried on said supporting roll, a pair oi endless travelling belts for receiving and engaging the body portion of the tubes from said supporting roll, and conveying said tubes to said chilled supporting roll, a blower for directing a with said pair of endless travelling belts, and an endless belt coacting with the periphery of said chilled roll to flex and apply pressure to said seams and convey thetubes on said supporting roll.
6. Apparatus for formin bags from "tubes of heat-scalable sheet material which comprises a conveyor for continuously feeding a plurality of spaced tubes, a heated supporting roll and a spaced chilled supporting roll, guide means for aligningoneendofsaidtubeswithsaidheated supporting roll, an endless belt coacting with about half the periphery of said supporting roll toflex andapply pressuretosaidtubes for formingaseamwhilecarriedonsaidsupporflngmil,
e ollf ap ri s egulated asainstsaidendlessbeltwhileincontactwith .saidsupportingmlhapairotendlesstmvelling beitsi'orreceivingthetubesfromsaidsmortingmllandconveyingsaidtubestosaidchilled supporting roll, a blower for directing a current ofairagainsttheseamswhiletravellingwithsaid pairorendlessu-avellingbelmandanmdless beltcoactingwithabouthalttheperipheryot saidchilledrolltoflexandapplypressureto saidseamsandeonveythetubesonsaidsupportingroll. i
US465010A 1942-11-09 1942-11-09 Method and means for making bags Expired - Lifetime US2364009A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2438624A (en) * 1942-02-04 1948-03-30 Stenglein Karl Apparatus with rotatable head and belt for supporting containers and with means for closing containers
US2459234A (en) * 1945-10-18 1949-01-18 Visking Corp Flame sealing apparatus
US2592081A (en) * 1949-03-26 1952-04-08 Ohio Commw Eng Co Method of making containers
DE928337C (en) * 1949-11-08 1955-05-31 Paul Graf Machine for the production of single or multi-layer paper bags for cement, artificial fertilizer and the like. like
US3527633A (en) * 1965-02-22 1970-09-08 Centra Anstalt Machine for the automatic controlled manufacture and output of plastic bags
US3772116A (en) * 1971-10-12 1973-11-13 H Schaffron Apparatus and method for forming rectangular bottom plastic bag machine
US20040256766A1 (en) * 2001-11-23 2004-12-23 Primo Finetti Method and apparatus for forming containers

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2438624A (en) * 1942-02-04 1948-03-30 Stenglein Karl Apparatus with rotatable head and belt for supporting containers and with means for closing containers
US2459234A (en) * 1945-10-18 1949-01-18 Visking Corp Flame sealing apparatus
US2592081A (en) * 1949-03-26 1952-04-08 Ohio Commw Eng Co Method of making containers
DE928337C (en) * 1949-11-08 1955-05-31 Paul Graf Machine for the production of single or multi-layer paper bags for cement, artificial fertilizer and the like. like
US3527633A (en) * 1965-02-22 1970-09-08 Centra Anstalt Machine for the automatic controlled manufacture and output of plastic bags
US3772116A (en) * 1971-10-12 1973-11-13 H Schaffron Apparatus and method for forming rectangular bottom plastic bag machine
US20040256766A1 (en) * 2001-11-23 2004-12-23 Primo Finetti Method and apparatus for forming containers

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