US3293765A - Method and apparatus for drying the adhesive on closing flaps of flat-bags and envelopes and the like - Google Patents

Method and apparatus for drying the adhesive on closing flaps of flat-bags and envelopes and the like Download PDF

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Publication number
US3293765A
US3293765A US387415A US38741564A US3293765A US 3293765 A US3293765 A US 3293765A US 387415 A US387415 A US 387415A US 38741564 A US38741564 A US 38741564A US 3293765 A US3293765 A US 3293765A
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United States
Prior art keywords
bags
drying
flat
flaps
gummed
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Expired - Lifetime
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US387415A
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English (en)
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Winkler Richard
Dunnebier Kurt
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Individual
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/007—Treating a particular portion of the web or plate, e.g. the edge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
    • 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
    • B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
    • 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
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • 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
    • B31B70/62—Uniting opposed surfaces or edges; Taping by adhesives
    • B31B70/626—Arrangements for permitting the glue to set

Definitions

  • infrared drying in the production of fiat-bags involves a great risk of fire because, in the event of a sudden stopping of the machine as a result of disturbances which can never be completely avoided, the paper under the infrared radiators, which continue to glow for a long time, catches fire or at least becomes charred. It is true that the infrared radiators may be automatically swung out on stopping the machine, but this means a further complication of the installation.
  • the object of the invention is to overcome the said disadvantages and to increase the drying capacity of the machines with a simultaneous reduction in the power consumption for drying.
  • This object of the invention is achieved by drying the adhesive, which may be of any suitable type and is hereinafter called gum, applied to the closing flaps, by means of the heat generated in this adhesive itself in a high-frequency electric field.
  • the energy losses in high-frequency drying are at a minimum in comparison with the above-mentioned types of drying so that, with the same conditions otherwise in an envelope machine for drying the closing-lap gum, there is a ratio of about 12 kw. for the drying with a hot-air blast, -6 kw. for drying with infrared radiators 22.5 kw. for high-frequency drying.
  • the high-frequency drying is carried out in such a manner that the freshly gummed closing flaps of the fiat bags travel under or over two or more rodshaped electrodes at the conveying speeds existing in the machine. Between the electrodes there is generated an electric field of high frequency which becomes concentrated in the moist layer of adhesive which is a good conductor, and to some extent also in the moist paper, and heats and dries both from the inside.
  • the path of travel of the parts to be dried is substantially parallel with the longitudinal direction of the electrodes.
  • the freshly gummed closing flaps to be dried are conveyed through the interior of a slotted waveguide, in the longitudinal direction of this waveguide in which there is a high-frequency electric field which extends perpendicularly to the surface of the paper.
  • the effect is the same as in the first case.
  • Flat bags conveyed individually through the machine are preferably held flat at the closing flaps to be dried, on a conveyor belt of a material which does not convert the high-frequency electrical energy into heat in itself, for example Teflon, i.e. a fluorocarbon resin of the character hereinafter more fully described. If the machine stops, there is no danger of the paper burning even if the highfrequency installation is switched on.
  • Teflon i.e. a fluorocarbon resin of the character hereinafter more fully described.
  • a fiat-bag carrier Preferably mounted to one side of a fiat-bag carrier is a high-frequency generator, the output terminals of which carry, on holders, rod electrodes which are substantially parallel to the direction of travel of the carrier and which produce between the and substantially parallel to the surface of the paper, a high-frequency electric field.
  • the rod electrodes which are parallel with one another and spaced at an appropriate distance in relation to each other, may be arranged obliquely in relation to the direction of travel of the flat-bag carrier which then brings the zones of the wide gumming successively to the points where the field has its maximum effect and causes drying step-by-step.
  • high-frequency electric voltage is preferably produced by a magnetron in a waveguide of brass or the like consisting of two parallel ilnes, the lines being divided into an upper and a lower pair by a slit; the lower pair may be constructed in the form of vacuum passages.
  • the one end of the waveguide is connected in known manner to a water load, which may contribute several advantages, such as elimination of reflection of the electric field and absorption of the unused energy.
  • a conveyor belt which is perforated, is preferably provided to support the closing flaps of the flat bags conveyed along the electrodes or through the waveguides for the high-frequency field; suction means for attracting and holding the closing flaps on the conveyor belt are then provided below the conveyor belt.
  • the path of travel of the flat bags to be dried may equally well be in the form of an are or a curve and the electrodes or waveguides are then adapted to this shape.
  • FIGURE 1 is a plan view of an arrangement of rod electrodes and conveying means for the drying of the closing flaps of fiat bags with a single strip of adhesive;
  • FIGURE 1A shows an arrangement in which a plurality of flat bags, having relatively wide gummed portions, are disposed on a conveyor belt above which there is mounted a pair of longitudinally extending electrodes inclined at a small angle to the direction of travel of the belt so that all portions of the gummed areas are exposed to an electric field while the flaps are subjected to a suction action;
  • FIGURE 2 is a vertical section through the arrangement taken along the line IIII of FIGURE 1;
  • FIGURE 3 is a vertical section through the arrangement taken along the line III-III of FIGURE 2, with the vacuum passage omitted;
  • FIGURE 4 is a plan view of an arrangement of waveguides and conveyor means for the drying of self-adhesive fiat bags with two strips of adhesive;
  • FIGURE 5 is a vertical section through the arrangement shown in FIGURE 4, taken along the line V-V of the latter, and
  • FIGURE 6 is a vertical section through the arrangement shown in FIGURE 5, taken along the line VI-VI of the latter.
  • the two rod-shaped electrodes 1 and 2 are mounted at a distance of a few millimeters above a conveyor belt 3 which runs over rollers 4, rotating in the direction of the arrows shown in FIGURE 2, at the conveying speed of the machine.
  • Each of the two electrodes 1 and 2 comprises a holder 5 and 6, which are secured by bolts or screws 7 to links 8 and 9 respectively.
  • the links 8 and 9 are each connected by screws 10 to one of the output terminals 11 and 12 of an electric field high-frequency generator designated by 13.
  • the spacing of the eelctrodes 1 and 2 apart from each other and from the conveyor belt 3 can be adjusted as desired as a result of the slots in the pars 5, 6, 8 and 9, the spacing of the electrodes being preferably adjusted to a desired fraction of the wave length of the electric field.
  • the conveyor belt 3 is perforated, as shown at 14 in FIG. 1, these perforations extending throughout the length of the belt.
  • a vacuum chamber 15 which is provided with a certain reduced pressure by means of connections through a line 15a with an exhauster, not shown.
  • the closing flaps of the flat-bags 16 are sucked tightly against the surface of the conveyor belt by the action of the vacuum chamber, with the fresh gumming 17 exposed.
  • the flat-bags 16 the large horizontally extending portions of which are held by a carrier or conveyor means, shown schematically in FIG. 2, and designated 3a therein, included in the flat-bag machine, after having their closing flaps gummed by conventional means (not shown), pass with their freely projecting closing flaps over the conveyor belt 3.
  • These closing flaps are moved by the conveyors under the two electrodes 1 and 2 through the electric field created between the latter. As a result, the paper and gumming become heated and the gumming dries.
  • the carrier or conveyor means 3a may be upper and lower conveyor belts having their bag conveying runs pressed against each other and the interposed bags being advanced.
  • the electrodes 1 and 2 are preferably arranged obliquely in relation to the conveying direction, over the gummed areas, so that the drying begins at one side and is car- :ried over to the other side as the blanks are advanced.
  • FIG. 1A illustrates schematically in which the electrodes 1a and 2a are disposed obliquely to the direction of travel of belt 31) which is perforated and subjected to the vacuum action in the manner shown in FIG. 2.
  • the belt 3! may serve to support and convey relatively wide gummed areas of the flat-bags 16a while the main body portions of the fiatbags are conveyed on an extension of conveyor means included in the flat-bag machine, such as that indicated at 3a in FIG. 1.
  • FIGURES 4 to 6 21 is a waveguide of brass or the like. High-frequency electric voltage is supplied to it, at the end designated by M, for example by a magne tron. The end designated by W is connected to a waterload having advantages of the character previously stated.
  • M for example by a magne tron.
  • W is connected to a waterload having advantages of the character previously stated.
  • the waveguide is in the form of two parallel lines 22, 23. It is divided by a slit 24 for the passage of the closing flaps to be dried, between an upper part 22, 23 and a lower part 22', 23'.
  • the two parallel lines are connected to one another by bends 25, 25.
  • the main body portions of the fiatbag 30 may be suitably supported and conveyed by carrier or conveyor means similar to that designated 3a in FIG. 2.
  • the lower part 22 23' of the waveguide is connected in a suitable way with suction means to provide a vacuum for holding down the closing flaps on the conveyor belt 27.
  • Internal walls designated 22a and 23a are provided vertically in the region indicated in FIG. 4 for enabling suction to be created within the parts 22' and 23 of the waveguide. Suction for this purpose is created by a connection 22'b extending from part 22 of the waveguide to a suitable vacuum producing source.
  • the waveguides 21 to 23 receives high-frequency electric oscillations from the magnetron, an electric field prevails in its interior. Electrical energy is converted directly into heat in the paper or the gumming of the flatbags which are moved longitudinally through the portion of the waveguide that is divided by the slit 24, and so the gumming is dried.
  • the conveyor belt 3 or 27 and the vacuum passage 15 must consist of a material which does not concentrate the electrical energy in itself in a high-frequency electric field and convert it into heat, for example fiuorocarbon resins, such as polytetrafiuoroethylene with or without propylene groups, available under the trade mark Teflon.
  • fiuorocarbon resins such as polytetrafiuoroethylene with or without propylene groups, available under the trade mark Teflon.
  • the path of travel of the fiatbags to be dried may, for example, be circular if the flat-bags with exposed closing flaps are held on the circumference of a drum by means of a belt.
  • This arrangement has the advantage that the closing flaps are stiffened as a result of the curvature so that the conveyor belt 3 or 27 can be omitted.
  • more than two electrodes 1 and 2 may be used or, when drying in the interior of a waveguide, this waveguide may be arranged in only one line or in more than two parallel lines.
  • a method of drying moist gum on the closure flaps of fiat-bags, envelopes or the like during their passage through a machine for making the same comprising advancing the gummed flaps along a path adjacent to at least two spaced, electrodes which extend substantially in the conveying direction and between which there is produced a high-frequency electric field, and applying suction to the gummed flaps to maintain them in fiat condition against a surface on which they are being advanced along said path.
  • An apparatus for drying moist gum on the closure flaps of flat-bags, envelopes or the like which comprises: means for conveying the gummed flaps along a predetermined path, rod-shaped electrodes mounted at a short distance from and substantially parallel with the path of travel of the gummed flaps, a high-frequency generator connected with said electrodes adapted to create a highfrequency electric field between the electrodes which is directed substantially parallel with the surface and transversely to the direction of travel of the gummed flaps, carrier means for the main body of the flat-bags, which is movable at the conveying speed of said conveying means for supporting the gummed flaps, and suction means cooperating lwith said conveying means to hold the gummed parts smoothly thereon.
  • An apparatus in which said conveying means comprises a perforated conveyor belt.
  • An apparatus characterized in that the rod electrodes are parallel with one another and are arranged obliquely in relation to the direction of travel of the flat-bags so that successive portions of wide gummed areas come successively to the region in which the field has the strongest action.
  • An apparatus for drying moist gum on the closure flaps of flat-bags which comprises: means for conveying successive fiat-bags having said closure flaps with moist gum thereon along a predetermined path, a waveguide which is fed with high-frequency electromagnetic energy mounted parallel with the path of travel of the flat-bags, said waveguide being provided with an elongated slit, said means for conveying the flat-bags being arranged to carry their gummed flaps through said slit and along the region in Which the high-frequency electric field is established in the interior of the waveguide and directed substantially across the entire width of the gummed flaps as the latter pass along said slit in the waveguide, and means for creating suction in the part of said waveguide below said slit to retain the gummed flaps against the conveying means.
  • one end of the waveguide is connected to a water load.
  • said conveying means comprises two separate carriers which are movable at the same conveying speed, one of said carriers supporting the gummed parts thereof, and said suction means cooperating with said one of the carriers to hold the gummed parts flat on the latter.
  • An apparatus characterized in that said one of the carriers is arranged to pass through the slit in the waveguide which is divided by this slit into an upper portion and a lower portion and the lower portion of the waveguide being connected with the means for creating suction.

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  • Engineering & Computer Science (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Biotechnology (AREA)
  • Textile Engineering (AREA)
  • Molecular Biology (AREA)
  • Drying Of Solid Materials (AREA)
  • Making Paper Articles (AREA)
  • General Preparation And Processing Of Foods (AREA)
US387415A 1963-08-17 1964-08-04 Method and apparatus for drying the adhesive on closing flaps of flat-bags and envelopes and the like Expired - Lifetime US3293765A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEW35112A DE1237886B (de) 1963-08-17 1963-08-17 Verfahren und Vorrichtung zum Trocknen der Gummierung der Verschlussklappen von Flachbeuteln, Briefumschlaegen od. dgl. in der Maschine zu ihrer Herstellung

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GB (1) GB1032539A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3404462A (en) * 1966-08-09 1968-10-08 Standard Register Co Dielectric heat apparatus
US3456355A (en) * 1967-11-22 1969-07-22 Canadian Patents Dev Microwave dryer for drying the glue line in paper forms
US3484179A (en) * 1966-08-17 1969-12-16 Stevens & Co Inc J P Method for selective heating in textiles with microwaves
US3491457A (en) * 1967-10-10 1970-01-27 Bechtel Int Corp Microwave drying method and apparatus
US3707773A (en) * 1971-01-27 1973-01-02 Service Business Forms Multi-line gluing of superimposed leaves
US3965851A (en) * 1974-07-19 1976-06-29 Champion International Corporation Apparatus for applying sealing material to envelopes
US4055295A (en) * 1976-09-15 1977-10-25 Champion International Corporation Self-sealing envelope and method of making same
WO1987003632A1 (en) * 1985-12-12 1987-06-18 Imatran Voima Oy Method and apparatus for the levelling of the humidity profile of a continuous web by dielectric drying
EP1151233A4 (de) * 1999-01-11 2002-04-24 Microwave Proc Technologies Pt Verfahren und vorrichtung zur mikrowellenbehandlung von flachmaterialien
CN112815684A (zh) * 2021-02-02 2021-05-18 江西春兴新能源有限公司 一种蓄电池固化后极板的连续微波干燥工艺方法
CN112844984A (zh) * 2021-02-02 2021-05-28 江西春兴新能源有限公司 蓄电池涂板后的极板连续微波干燥工艺方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2501450A1 (fr) * 1981-03-09 1982-09-10 Applic Micro Ondes Ste Fse Tunnel de traitement micro-ondes et son application au sechage de produits encolles
DE29506954U1 (de) * 1995-04-28 1995-07-20 Ehret, Bernhard, 79111 Freiburg Trocknungsvorrichtung für mit Druckfarben, Klebstoffen und vergleichbaren Medien versehene Papier- oder Kunststoffbahnen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2212522A (en) * 1937-12-17 1940-08-27 United Shoe Machinery Corp Use of a stray electrostatic field for drying leather and the like
US3082710A (en) * 1958-06-24 1963-03-26 Radio Heaters Ltd Foodstuffs baking apparatus
US3197601A (en) * 1962-01-26 1965-07-27 Uarco Inc Heat treating apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2212522A (en) * 1937-12-17 1940-08-27 United Shoe Machinery Corp Use of a stray electrostatic field for drying leather and the like
US3082710A (en) * 1958-06-24 1963-03-26 Radio Heaters Ltd Foodstuffs baking apparatus
US3197601A (en) * 1962-01-26 1965-07-27 Uarco Inc Heat treating apparatus

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3404462A (en) * 1966-08-09 1968-10-08 Standard Register Co Dielectric heat apparatus
US3484179A (en) * 1966-08-17 1969-12-16 Stevens & Co Inc J P Method for selective heating in textiles with microwaves
US3491457A (en) * 1967-10-10 1970-01-27 Bechtel Int Corp Microwave drying method and apparatus
US3456355A (en) * 1967-11-22 1969-07-22 Canadian Patents Dev Microwave dryer for drying the glue line in paper forms
US3707773A (en) * 1971-01-27 1973-01-02 Service Business Forms Multi-line gluing of superimposed leaves
US3965851A (en) * 1974-07-19 1976-06-29 Champion International Corporation Apparatus for applying sealing material to envelopes
US4055295A (en) * 1976-09-15 1977-10-25 Champion International Corporation Self-sealing envelope and method of making same
WO1987003632A1 (en) * 1985-12-12 1987-06-18 Imatran Voima Oy Method and apparatus for the levelling of the humidity profile of a continuous web by dielectric drying
US4823477A (en) * 1985-12-12 1989-04-25 Imatran Voima Oy Method and apparatus for the levelling of the humidity profile of a continuous web by dielectric drying
EP1151233A4 (de) * 1999-01-11 2002-04-24 Microwave Proc Technologies Pt Verfahren und vorrichtung zur mikrowellenbehandlung von flachmaterialien
US6546646B1 (en) 1999-01-11 2003-04-15 Microwave Processing Technologies Pty. Limited Method and apparatus for microwave processing of planar materials
CN112815684A (zh) * 2021-02-02 2021-05-18 江西春兴新能源有限公司 一种蓄电池固化后极板的连续微波干燥工艺方法
CN112844984A (zh) * 2021-02-02 2021-05-28 江西春兴新能源有限公司 蓄电池涂板后的极板连续微波干燥工艺方法

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Publication number Publication date
DE1237886B (de) 1967-03-30
GB1032539A (en) 1966-06-08

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