US1940559A - Method of uniting wax fabrics - Google Patents

Method of uniting wax fabrics Download PDF

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Publication number
US1940559A
US1940559A US599323A US59932332A US1940559A US 1940559 A US1940559 A US 1940559A US 599323 A US599323 A US 599323A US 59932332 A US59932332 A US 59932332A US 1940559 A US1940559 A US 1940559A
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United States
Prior art keywords
paper
wax
adhesive
heat
bag
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US599323A
Inventor
Moore Stuart
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Dixie Wax Paper Co
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Dixie Wax Paper Co
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Publication date
Application filed by Dixie Wax Paper Co filed Critical Dixie Wax Paper Co
Priority to US599323A priority Critical patent/US1940559A/en
Priority claimed from US621707A external-priority patent/US1940560A/en
Priority claimed from US637313A external-priority patent/US1940561A/en
Application granted granted Critical
Publication of US1940559A publication Critical patent/US1940559A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/36Bending and joining, e.g. for making hollow articles
    • B29C53/38Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges
    • B29C53/48Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges for articles of indefinite length, i.e. bending a strip progressively
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24Joining 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
    • B29C65/245Joining 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 the heat transfer being achieved contactless, e.g. by radiation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24Joining 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
    • B29C65/30Electrical means
    • B29C65/305Electrical means involving the use of cartridge heaters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11Joint 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
    • B29C66/112Single lapped joints
    • B29C66/1122Single lap to lap joints, i.e. overlap joints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/40General 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
    • B29C66/41Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43Joining a relatively small portion of the surface of said articles
    • B29C66/431Joining the articles to themselves
    • B29C66/4312Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/40General 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
    • B29C66/41Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43Joining a relatively small portion of the surface of said articles
    • B29C66/432Joining 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/40General 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
    • B29C66/41Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43Joining a relatively small portion of the surface of said articles
    • B29C66/432Joining 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
    • B29C66/4322Joining 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/90Measuring or controlling the joining process
    • B29C66/91Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
    • B29C66/91423Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools using joining tools having different temperature zones or using several joining tools with different temperatures
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/90Measuring or controlling the joining process
    • B29C66/91Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91431Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being kept constant over time
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/90Measuring or controlling the joining process
    • B29C66/91Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91641Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/90Measuring or controlling the joining process
    • B29C66/91Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B29C66/91655Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating by controlling or regulating the current intensity
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24Joining 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
    • B29C65/247Joining 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 the heat resulting from a chemical reaction
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/83General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834General 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
    • B29C66/8341Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411Roller, cylinder or drum types
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/83General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834General 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
    • B29C66/8351Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83511Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/84Specific machine types or machines suitable for specific applications
    • B29C66/851Bag or container making machines
    • B29C66/8511Bag making machines
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING 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
    • B31BMAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00Making flexible containers, e.g. envelopes or bags
    • B31B70/60Uniting opposed surfaces or edges; Taping
    • B31B70/64Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10Methods of surface bonding and/or assembly therefor
    • Y10T156/1002Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1007Running or continuous length work
    • Y10T156/1008Longitudinal bending

Description

Dec. 19, 1933.
s. MOORE mm'non OF UNITING WAX FABRICS Filed March 16. 1952 2 Shets-Sheet 1 mm SZWZ Moore.
Dec. 19, 1933. s MOQRE 1,940,559
METHOD OF UNITING WAX FABRICS Filed March 16. 1932 2 Sheets-Sheet 2 Patented Dec, 19, 1933 METHOD OF UNITING WAX FABRICS Stuart Moore, mu, Tex ssignmto Dixie Wax Paper Company, Inc., Dallas, Tex., a cornotation of Texas Application March is, 1932. Serial No. 599,323
3 Claims. (01.15442) The present invention pertains to the art of making bags of paper or other flexible material adapted to such use, which have been previously coated on one or both sides with wax, parailine, or similar moistureproof coatings in order to render the bags resistant or impervious to grease or moisture, and which coating will also exclude air and retard the escape of the flavor or aroma of the food contents stored within the bags. The invention further relates to a novel method for uniting and sealing the joints or edges of such coated papers or fabrics.
Heretofore, it has not been commercially feasible to manufacture bags of glassine paper or other papers coated with parafiine wax or other coating substance, because no method was known for effecting the rapid and proper penetration of the glue, paste or other adhesive necessary for securely affixing or uniting the overlapping edges of the sides and bottoms of bags. However, the application of heat to wax coated papers and fabrics has been known for melting the wax coated upon such papers or fabrics in order that when the wax cools, it will congeal and thereby cause a temporary connection. Also, the application of heat has been employed for uniting the edges of wax coated paper to which glue has been previously applied, in order that the heat will melt the wax coating and permit the glue to come in contact with the paper or fabric, and subsequently, applying pressure to the paper or fabric to hold the paper sections together until the glue has set, but each of these known methods of uniting and sealing wax papers together have proven unsatisfactory in the making of bags, as the joints so formed are not of sufficient strength as to permit the bags to retain the articles stored therein.
Amongst the principal objects of the present invention is to provide a novel method of manufacturing bags by securing a sufficiently strong joint between the overlapping edges and folds of the paper to be connected and forming a seal about such joint by the application of heat at the point of contact of the edges of the paper to be connected, whereby a sealed joint will be effected, having greater strength than that of the paper employed.
Other objects of the invention will be in part obvious and in part pointed out hereinafter.
In order that the invention and its mode of operation may be readily understood by'persons skilled in the art, I have in the accompanying illustrative drawings and in the detailed following description based thereon, set out several possible embodiments of the same.
In these drawingsz-e- Figure 1 is a fragmentary view in vertical section of a conventional type of bag making machine, illustrating how the apparatus for carrying out my invention may be installed thereon;
Figure 2 is an enlarged detail section of the same bag making machine showing in side elevation the heaters for effecting a seal between the longitudinal edges of a web of paper after the latter has been formed into a flat tube;
Figure 3 is a detail elevation of a tympan or packing cylinder of the bag making machine showing another form of heater applied thereto and its connection with a suitable source of electrical energy, which latter has been diagrammatically shown;
Figure 4 is an end elevation of the heaters as illustrated in Figure} with the flat tube of waxed paper passing therebetween;
Figure 5 is an enlarged detail end elevation of the packing cylinder and an adjacent plate cyl inder of the printing mechanism showing, in end elevation, one of the heaters arranged within the packing cylinder and the path of travel of the paper bags between the cylinders;
Figure 6 is an enlarged longitudinal section through one of the fiat heaters;
Figure 7 is a transverse section through the same and Figure 8 is a vertical transverse section through the upper adjustable heater as better shown in Figures 2 and 4; of the drawings.
Referring now more particularly to the accompanying drawings wherein like correspond-- ing parts are designated by similar reference characters throughout the several views, I have ,shown a conventional type of bag making machine comprising a frame 1 supporting at one end, thereof, a roll 2 of paper from Whichthe bags are formed. The web 3 of paper from this roll, and which is, to be formed into bags, passes over the usual paste supplying roll 4 whereby the paste is applied to one of the longitudinal edges of this web of paper. This web 3 progresses about a suitable forming element 5 and thence to the bite of a pair of feed rolls 6 which are effective to advance the web and ensure its progressive folding into a flat tube from the forming element 5. The pasted edge, when the web is folded, overlaps the adjacent folded edge of the web and affords a longitudinal seam for the tube, as usual. The paper tube so formed, after passing through the usual feed and catch rolls, comes in contact with the usual severing device, which latter severs the tube in bag lengths in a successive manner. The roll 7 supplies paste to the margin of the leading end of each succeeding tube or bag section so severed. Each bag section, now having the longitudinal seam properly sealed and having a streak of paste along the leading end thereof, is fed to the usual con veyor 8 where the forward end of each tube is folded over and subsequently fed between the packing cylinder 9 and the plate cylinders w of.
ill)
the usual printing mechanism associated with the bag making machine whereupon the lace oi. each bag may'have the required printed matter thereupon. Each bag so formed and printed is then delivered to the upper part 0! the conveyor 8 and finally discharged in its completed form to one side of the bag making machine. The foregoing briefly describes the method of forming bags from an ordinary paper bag making machine now extensively used, and the same forms no part of the present invention.
The application of glue to the longitudinal edges as well as the ends of bags so formed by a bag making machine oi the kind above set forth, has proven very satisfactory where ordinary paper is employed, but where glassine or other paper having a coating of wax or oil is employed. the bond or seal between the longitudinal edges and ends of each bag as formed does not permit of the generaluse of such bags as is now required in the use of ordinary paper bags which contain no moistureprooi coatings. Heretoiore the application of heat has been made to the seams and edges of wax coated papers, whereupon the heat will soften or liqueiy the wax in order that by merging and adherence of the coating, a seal may be effected. Still additional methods and processes of scaming or uniting the edges of wax papers or fabrics have been used, which consist in applying an adhesive to that portion or edges of the coated papers to be connected, and then applying suflicient heat thereto to melt the wax or other coating and also supplying suflicient pressure to hold the edges of the paper together until the adhesive has set and the wax congealed, and yet the bags or other containers so formed do not have a strong and effective bond or seal at the seams or edges of the bags as to permit such moistureproof or wax coated bags to be of general use.
In carrying out my invention, I have found that by the proper application of heat without the use of pressure to the edges or seams of paper previously waxed or coated with a moistureproof material, may be readily united and a sufiiciently strong seal or, bond established that will permit thebags so formed to be employed for general use. Such wax coated paper should be substituted for the roll 2 of the ordinary uncoated paper and the web of wax coated paper is first supplied with a suitable paste or adhesive along its longitudinal edges by means of the paste applying roll indicated by the numeral 4 upon the drawings. The tube so formed with the adhesive thereupon passes between the heaters 11 and 12 whereupon the wax or other coating upon the paper is first melted to liquid form and the glue placed thereupon permitted to flow into contact with the paper. By the continual and simultaneous application. of heat, the cells or pores of the paper have a tendency to expand whereupon the adhesive can be more readi- 1y absorbed by the fibers thereof especially in the absence of pressure and thus enhance the strength of adherence. These heaters 11 and 12 being-relatively long permit of the application of heat to the paper for a relatively long period of time, whereupon by this continual application of heat to the adhesive, the moisture contained in the latter is more readily evaporated and the adhesive permitted to set in a relatively short period of .time. As the web of paper progresses beyond the heaters 11 and 12, it will readily begin to cool, whereupon the Wax so melted about the bond or seal so made will con geal, thereby elIecting a moistureprooi. seal about the connected edges of the paper. In order to effect a similar seal between one of the open ends of each bag section and. permit 01' the proper application of heat, 1 preferably mount within the outer periphery of the packing cylinder 9, the heaters 13. Each one of these heaters 13 is so arranged and the packing cylinder so timed that a heater 13 will come in contact with that end of the bag to be sealed and stays in contact with such end of the bag until the packing cylinder has made one-half of a complete revolution, which is of sumcient time to permit first of the melting of the wax at that point of the bag to which the second or end seal is to be effected, permitting the paste which has been applied to that end of the bag by the paste applying apparatus 7 to come in contact with the paper and subsequently, by the continual application of heat to the paper, the pores thereof will expand or the fibers thereof separated in order that the adhesive will be more readily absorbed and as the paper bag so formed leaves the packing cylinder, it will be permitted to cool whereupon thewax which has been previously melted, will congeal so as to establish a moisture-proof coating about the seal so made. By applying heat and without applying pressure to the wax coated papers as they pass between the heaters 11 and 12 or in contact with the heater 13 in the manner aforesaid, I have found that a truly moistureproof bag is formed with sealed joints of greater strength than that of the paper so employed in the making of the bags.
Whereas the heaters as shown in the accompanying drawings are supplied with electrical energy, it is, of course, to be understood that heat derived from gas, chemicals, steam, heated water, or other liquids, may be used. While the degree or intensity of heat necessary to effect uniting or sealing varies with the amount of wax or other coating material which has been applied to the paper from which the bags are formed, the requisite and proper intensity may be secured by any common or well known meth- 0d of controlling the electrical current or other heating medium. These heaters are each formed from a tube 14 preferably made from copper. The length and width, together with the thickness of the tube, may be varied to meet the particular requirements of the type of bag to be manufactured, or the type of bag making machine used, as well as the heating element employed. Positioned within the tube 14 is a resistance coil 15 which is bent upon itself, the two sections thus formed are separated by an asbestos partition 16 and the electrical energy is supplied to this element 15 through the conductors 1'7. Surrounding this element 15 and positioned within each tube, is an envelope of asbestos 18, whereas the opposite ends of the tube are closed by suitable sealing material 19. The heaters 13 are of the same outer contour as the heater 12 and these heaters 13 are each fastened Within a suitable transversely extending channel or recess 20 formed within the outer periphery of the packing cylinder 9. The heaters 13, as illustrated in Figure 1 of the drawings, are arranged diametrically opposite within the outer periphery of the packing cylinder 9 so that when the cylinder is revolved, one heater contacts the bottom fold or seam of the bag, the heat therefrom penetrates and heats the adhesive which has been previously applied to the being in contact with the conductor rings 21' secured upon an extension of the cylinder 9 and these conductor rings 21 are electrically con-- nected by means of the conductors 21 to a suitable source of electrical energy herein indicated by the numeral 22. Electrically arranged within the conductors 21 is a rheostat 23 or other suitable control, whereby the flow of current to the element within the heater 13 may be controlled so that the proper temperature may be automatically or manually maintained.
The heater 12 is supported upon the bed plate 21.01 the bag making machine and held in proper position by means of the clamps 25. The upper heater 11 has secured to one end thereof, a bracket 26 and this bracket 26 is adjustably connected by means of the set screw 27 to the frame 1 of the bag making machine, whereas the opposite end of this heater 11 is curved or bent upwardly as at 28. The bent or free end 28 of this heater 11 permits the web of paper which is to be formed into bags to readily pass between the heaters 11 and 12 and the vertical adjustment of this heater 11 may be readily established in order to cause the same to be retained in proper position above the seams of the paper web, which are to be sealed together.
The web of paper, as it leaves the former 5 is folded upon itself in the shape of a tube, as is better illustrated in Figure 4 of the drawings, and the overlapping longitudinal edges of the paper form a seam which is to be secured together by means of the adhesive 29. This adhesive has been applied to the paper as it passes over the paste supplying roll 4 and the paper tube, together with the seam so formed, passes between the heaters 11 and 12 in order that the heat will be applied directly to the opposite sides of the paper at a restricted longitudinal area or zone. This seam or area to be sealed or united travels the full length of the heaters 11 and 12 in order that the heat will first melt or liquefy the wax coating upon the paper, and.
as the paper progresses between these heaters, the uniting and sealing operation heretofore described, will be completed. As the folded over end 30 of each bag section illustrated in Figure 5 comes in contact with a heater 13, the heat so generated will perform a similar action upon this end of the bag to be sealed, as when the longitudinal seam passes between the heaters 11 and 12 in order, at this point or end of the bag, the proper sealing and uniting will be effected. That portion of the paper having the adhesive thereon as it comes in contact with the heaters 11, 12 or 13, is not subjected to pressure as is apparent from Figures 4 and 5 of the drawings nor is pressure desired during either sealing operation.
The application of the invention heretofore described is not limited to bags in which the opposite edges thereof consist of a single fold, or in which one end is folded onto an adjoining portion of, the bag structure to close the same. but may be employed in the manufacture of bags of any other of the known types of structures. For example, the invention may be employed to manufacture a bag wherein the opposite edges thereof consist of two or more pleats'or folds, and-also may be employed in the manufacture of bags in which the bottom and top ends thereof are or may be closed, in an altogether different manner from that described; by the application ofheatto the adhesive and paper at the proper and necessary point of adherence. It is also to be understood that the method and apparatus herein shown and described are not limited for use in connection with paper bag making but the same may be employed for uniting any paper or fabric having an adhesive repellant coating thereupon.
Manifestly, the construction herein shown is capable of considerable modification and such modifications as come within the scope of my claims, I consider within the spirit of my invention.
I claim:-
1. The method of uniting wax coated paper which consists in applying an adhesive to that portion of the paper to be united, subjecting to heat that portion of the paper having the adhesive thereon whereby the wax will be melted to liquid form, the adhesive permitted to flow into contact with the paper, the cells or pores of the paper expanded to permit of the absorption of the adhesive, and the drying ofthe adhesive when absorbed by the paper all without the application of pressure and subsequently withdrawing the heat for permitting the wax to congeal about that portion of the paper so united.
2. The method of sealing wax coated papers which consists in applying an adhesive to that portion of the papers to be sealed together, subjecting that portion of the papers having the adhesive thereon directly to heat and without pressure whereby the wax will melt and the adhesive be permitted to come in contact with the paper, continually applying heat to the paper whereby the fibers thereof will absorb the ad-.-
hesive and the adhesive being further subjected to a drying action by the heat so applied, and withdrawing the heat, whereby the wax will congeal about that portion of the paper united together.
3. The method of sealing the seams of paper bags formed from wax coated paper which consists in overlapping the edges of a sheet of paper to form a seam, applying an adhesive to said seam, passing the seam with the adhesive thereon between relatively long spaced heaters whereby heat may be applied to the opposite sides of the seam for melting the wax and adhesive to liquid form without the application of pressure, continually and simultaneously applying the heat to the seam whereby. the adhesive will be permitted to flow in direct contact with the paper, the cells or pores of the paper being expanded to permit the absorption of the adhesive, and drying the adhesive when absorbed. by the paper, the entire action of the heaters being without the application of pressure and subsequently withdrawing the heat for permitting the wax to congeal about that portion 01' the paper so united.
- STUART MOORE.
US599323A 1932-03-16 1932-03-16 Method of uniting wax fabrics Expired - Lifetime US1940559A (en)

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US621707A US1940560A (en) 1932-03-16 1932-07-09 Paper bag making machine
US637313A US1940561A (en) 1932-03-16 1932-10-11 Apparatus for uniting wax paper

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2437114A (en) * 1942-12-10 1948-03-02 Nat Biscuit Co Container
US2437057A (en) * 1942-05-11 1948-03-02 Harry F Waters Heat sealing method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2437057A (en) * 1942-05-11 1948-03-02 Harry F Waters Heat sealing method
US2437114A (en) * 1942-12-10 1948-03-02 Nat Biscuit Co Container

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