IL28987A - Heat-sealing apparatus - Google Patents

Heat-sealing apparatus

Info

Publication number
IL28987A
IL28987A IL28987A IL2898767A IL28987A IL 28987 A IL28987 A IL 28987A IL 28987 A IL28987 A IL 28987A IL 2898767 A IL2898767 A IL 2898767A IL 28987 A IL28987 A IL 28987A
Authority
IL
Israel
Prior art keywords
wheel
web
plate
funnel
arcuate
Prior art date
Application number
IL28987A
Original Assignee
Salomon J
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Salomon J filed Critical Salomon J
Publication of IL28987A publication Critical patent/IL28987A/en

Links

Classifications

    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—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
    • 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
    • B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • 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
    • B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81431—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
    • 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
    • B29C66/816—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 mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8161—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 mounting of the pressing elements, e.g. of the welding jaws or clamps said pressing elements being supported or backed-up by springs or by resilient material
    • 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
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83511—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums
    • 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
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83521—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on bands or belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
    • 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
    • B29C66/849—Packaging machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/06—Enclosing successive articles, or quantities of material, in a longitudinally-folded web, or in a web folded into a tube about the articles or quantities of material placed upon it
    • B65B9/08—Enclosing successive articles, or quantities of material, in a longitudinally-folded web, or in a web folded into a tube about the articles or quantities of material placed upon it in a web folded and sealed transversely to form pockets which are subsequently filled and then closed by sealing
    • B65B9/087—Enclosing successive articles, or quantities of material, in a longitudinally-folded web, or in a web folded into a tube about the articles or quantities of material placed upon it in a web folded and sealed transversely to form pockets which are subsequently filled and then closed by sealing the web advancing continuously
    • 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
    • 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
    • B31B2155/00—Flexible containers made from webs
    • 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
    • B31B70/02—Feeding or positioning sheets, blanks or webs
    • B31B70/022—Holders for feeding or positioning sheets or webs
    • B31B70/024—Rotating holders, e.g. star wheels, drums

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Package Closures (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)

Abstract

1,153,779. Packaging machines. J. SALOMON. 14 Nov., 1967 [29 Nov., 1966], No. 53454/66. Heading B8C. [Also in Division B5] A machine for heat sealing a web 53 at spaced intervals comprises a rotatable wheel 14 having a plurality of projecting elements 21 extending radially outwardly from the periphery thereof, a heated arcuate member 24 positioned to extend around a portion of the periphery of the wheel 14 to overlie a plurality of the elements 21 and means for feeding the web 53 between the elements 21 and the member 24. A support table 12 and a cam plate 13 are secured to a vertical shaft 11 of the machine. The wheel 14 secured by spaced tie rods 15 to a plate 16 is rotatably mounted on the shaft 11 and can be driven by a motor (not shown). Each element 21 comprises a pad 22, Fig. 5, of silicone rubber lined with polytetrafluoroethylene which is urged outwardly by a spring 23. The member 24 extends around a 120 degree arc of the wheel 14 and is pivoted at 25 and locked by a clamp 26. A non-heated or forcibly cooled arcuate member 27 is positioned around a further 120 degree arc and is mounted on a pivot (not shown) and secured by a clamp 28. Funnels 29 each having an ellipticalsection stem 30 are each mounted on an arm 31 carried by one rod 15 and urged downwardly by a spring 34. The arm 31 forms one arm of a bell-crank lever the other arm of which carries a roller 32 bearing against a cam surface 33 on the plate 13. The vertical position of each funnel 29 is determined by a cam 35 engaging a portion of the second arm of the bell-crank. A clamp 36 having an inwardly concave clamping plate 37 is urged downwardly by a spring 38 against the action of which a roller 39 running on a cam 40 forces the clamp 36 as the plates 37 enter between the member 24 and the pockets formed by the elements 21. Holes 41 and grooves 42, 43 are formed in the plate 16, one hole immediately above each funnel 29. A radially outwardly sliding shutter 44 is arranged beneath each hole 41. A supply hopper 46 is arranged within a wall 45. In operation, for the formation of tea bags, a web 53 of paper impregnated with a heatscalable resin is fed from a roll 50 over a roller 51 and is longitudinally doubled upon itself to form a channel by a folder plate 82, Fig. 3b, located within a U-section plate 80. In the course of this folding operation, the rotation of the wheel 14 causes the stems 30 to be lowered into the channel and they are allowed by the surface 33 to move radially inwardly towards the wheel 14. Simultaneously, the plates 37 are lowered and brought into contact with the outer wall of the channel of the web by the cam 40 and move inwardly until they are positioned in the packets between adjacent elements 21. The pads 22 wrap the inner wall of the channel against the radially inner surface of the stems 30. As the wheel 14 rotates the pads 22 press the web 53 at spaced apart intervals against the inner surface of the member 24 to transversely heat seal the web. As each funnel 29 enters between the wheel 14 and the member 24, the associated shutter slides radially outwardly to permit a charge of tea to fall into the funnel 29. Scrapers (not shown) feed the tea over the holes 41 and scrape tea out of the grooves 42, 43. Upon further movement of the wheel 14 the cam 35 raises the funnels 29 and the stems 30 withdraw from the web 53 by the time they have reached the downstream end of the member 27 so that tea remains in the pocket. The web is cooled as it passes the member 27 and then passes around a roller 47 driven with a peripheral speed greater than that of the wheel 14 to remove any slack therefrom. A stationary member 47 surrounds a part of the periphery of the roller 47. The top of the web 53 which is still open passes around a disc 48 which presses it against a heated member 49 to heat seal the open edge. The completed web of tea bags is wound on a spool 52. In a modification, Fig. 3a (not shown), the clamp (36) has an outwardly concave plate (37) positioned to face the plate (37). The plate (37<SP>1</SP>) is spring urged inwardly but can be forced out by a cam to clamp the inner portion of the web against the stem 30. In another modification, Fig. 4 (not shown), the plates 37 are omitted and at the point at which the wheel (14) enters the member (24) there is provided a conveyer (60) synchronized with the wheel (14) and provided with projections (61) to force the web between the pads (22).

Description

Patents Form No. 3 PATENTS AND DESIGNS ORDINANCE.
SPECIFICATION .
APPARATUS" 11 WE ' JACOB SALOMON) : . · , KTW? ^11 .1.Π....^β...10ί»Λ.1....1133 ».?. *1?.?.....?.?.ί.?. do hereby declare the nature of this invention and in what manner the same is to be performed, to be particularly described aud ascertained in and by the following statement : - 4.
The present invention relates to a method and apparatus for heat-sealing a web of heat-sealable material.
The invention is particularly concerned with a method and apparatus for heat-sealing two portions of web material at spaced apart intervals, for example in the course of manufacture of sachets such as tea-bags or sugar bags.
Conventional bag making machines, which operate on heat-sealable material, have a maximum operating speed of 70-100 bags per minute. This limit is governed by the time required to fill the bags s well as to seal the web between the bags. The sealing of the bag is effected by two heated rollers or jaws, which bear one in contact with each side of the bags along a line, so that the period during which the material is heated is short. After leaving the rollers or jaws the material is cooled by the air. If the speed of the machine is increased, then the material contained b the bag, such as tea or sugar, has a tendency to tear the seal lines acting like a wedge and penetrates into the seams before a complete cooling and setting of the material occurs.
It is an object of the present invention to provide an improved heat-sealing apparatus.
According to the present invention there is provided a heat-sealing apparatus comprising a rotatable wheel having a plurality of projecting elements extending radially outwardly from the periphery thereof, a heated arcuate member positioned to extend around a portion of the periphery of the wheel to overlie a plurality of said elements, and means for feeding two portions of web material between said elements and said arcuate member.
As the web material is fed between the projecting elements and the heated member, it is heated and sealed at the positioning of said elements. Since the arcuate heating member is of a length to span a plurality of the elements, the web material is welded over a prolonged period.
The means for feeding the web of material may include a folding arrangement adapted to fold the web into a V-formation, so that the web is approximately 120° of the circumference of the wheel which may be provided, for example, with 6 protruding elements providing 36 pockets therebetween. Preferably adjacent the heated arcuate element, on the downstream side thereof, there is provided an arcuate cooling element of similar construction, which again spans a plurality of pockets and may extend, for example, for a further 120° of the periphery of the wheel.
Advantageously, the wheel is provided with a funnel arrangement for each of the pockets formed between the radially extending elements.
Each funnel construction is of a size such that the stem of the funnel, which is preferably elliptical in cross-section, can seat within a pocket of the wheel and can move round with the wheel between the periphery of the wheel and the arcuate heated and cooling member (where provided).
Each funnel may be supported on an arm which is pivoted to the wheel on an axis parallel to the wheel axis, the arm also being vertically reciprocable, the vertical reciprocation and radial positioning of the arm being effected by suitable cams.
With funnel arrangements as indicated above, each funnel can be brought into a position between the folded over web forming for example, a tea-bag strip, so that it provides a former for producing each individual 1»ag in the pockets of the wheel. Preferably, means are provided for forcing the radially outer portion of the folded web against the funnel, as it enters the pockets formed between the projecting elements and maintaining the web in contact with the funnel as it passes the arcuate heated member, so that the only points of the web which are in contact with the heated member, are those points which overlie the projecting elements.
The means for forcing the web against the funnel may comprise a cam operated clamp associated with each of the pockets, or may comprise a conveyor or chain positioned immediately upstream of the point at which the web enters the pockets of the wheel, the chain or conveyor being provided with outwardly extending projections which engage the web to force it against the funnel. These means, however, would not support the web against the funnel position approximately at the upstream end of the arcuate heated member.
The supply of tea or other material may continue as the funnels travel round with the wheel, the funnels being raised steadily, so that they disengage from the web at a position approximately at the downstream end of the arcuate cooled member. Means may be provided downstream of the cooled member for taking up slack in the web and for sealing the open edges of the channel formed in the web.
The invention also provides a method of heat-sealing using the apparatus of the invention.
In order that the present invention may mere readily be understood, the following description is given, merely by way of example, reference being made to the accompanying drawings, in which Figure 1 is a top plan view, in section, of a preferred embodiment of apparatus according to the invention; Figure la is a top plan view of the upper plate of the apparatus of Figure 1; Figure 2 is a front elevation of the apparatus of Figure 1 shwwn partly in section; Figure 3 is a schematic scrap section of the periphery §f the wheel, showing the means for guiding the web into the pockets; Figure 3a is a view similar to Figure 3 showing a raedified form ef said means; Figure 3b is a scrap section en the line 3-3 of Figure 3a5 Figure k is a view similar to Figure 3 showing an alternative form of said means; Figure 5 is a scrap section of a portion of the periphery of the wheel taken along the line 5-5 of Figure 6, illustrating the radially protruding element; and Figure 6 is a section on the line 6-6 of Figure 5· Referring now to the drawings, there is illustrated a preferred embodiment of machine according to the invention. As seen in Figure 2 the machine comprises a base 10 having a central vertical shaft 11 extending I spaced tie rods 15, to a feeding plate 16 positioned above the cam plate 13· In order to drive the wheel Ik and feeder plate 16, the wheel is provided with a sprocket 17 which is driven by a chain 18 and a reduction gear 19 , which in turn is driven by a motor (not shown) connected by a belt drive to pulley 20, The wheel Ik is caused to rotate in an anti-clockwise direction, as viewed in Figure 1, and as indicated by the arrow.
Equally spaced around the periphery of the wheel Ik are 36 radially extending elements 21 (Figure l). These elements 21, which are illustrated in greater detail in Figures 5 and 6, each consist of an elongate pad 22 made of silicone rubber lined with polytetrafluoroethylene, and each is urged outwardly by a spring 23.
Positioned around a 120° arc of the wheel Ik is a heated arcuate member 2k which is pivotally mounted on a support 25 and locked by a clamping arrangement 26. Similarly, a second non-heated or cooled arcuate member 27 is positioned to surround a further arc of 120° downstream of the member 2k, The member 27 is mounted on a pivot (not shown) and is secured by a clamp 28.
Each of the tie rods 15 carries a funnel 29 having an elliptical cross-section stem 30. The funnels are each mounted on an arm 1† carried by one of the tie rods 15. The arm 31 forms one arm of a bell-crank lever, the other arm of which carries a roller 32, which bears against a cam surface 33, on the outer face of the cam plate 13.
As can be seen more clearly in Figure 2, each funnel 29 is urged downwardly by a spring 3k surrounding the associated tie rod 15· The position of the funnel in the. vertical sense is determined by a cam 35 engaging a portion of the arm of the bell-crank carrying roller 32.
On the outer surface of each funnel 29 there is pivoted, near the top of the funnel, a clamp 36 having an inwardly concave clamping plate 37 at the lower end. Plate 37 is urged downwardly by a spring 38, against the action of which a roller 39 , running on a cam bar kO, secured to the table 12, forces the clamp 36 inwardly as the clamp plates 37 enter between the arcuate heated members 2k and the pockets formed by the elements 21. relation to plate 37· Plate 37 T is spring urged inwardly and can be forced out by a cam to clamp the radially inner portion of a web against the funnel stem 30· In the plate 16, 36 holes l are arranged one immediately above each of the funnels 29. Around a portion of the periphery *>f the plate 16, each./ •n|e¾-Hrer side of the holes 41, grooves 2, 3 are formed on the upper surface of the plate.
Underneath each of the holes 4l a radially outwardly sliding shutter 44 is arranged. Radial outward movement of this shutter is effected by a cam (not shown). A wall 45 surrounds a portion of the upper periphery of the plate l6, and a supply hopper 46 is arranged within this wall.
Referring to Figure 1, there can be seen downstream of the member 27 , a second roller 47 having, around a portion of the periphery thereof, an arcuate member 4? · . Adjacent the roller 4? is a disc 48, around a portion of the periphery of which extends a heated member 49t having an inner surface conforming to the periphery of the disc 48.
A supply roll 50 is associated with the table 12 and supplies web material via i -re» guide roller 51 and a web folding arrangement (not shown).
Downstream of the member 9 a take-up spool 5 is located.
As an illustration of the method of the invention, the operation of the above described apparatus- will be explained, by way of example, with heat-sealable> reference to the formation of tea-bags. A web oflfcwrfeeoew-fe ng resin impregnated paper is fed from roll 50 via the roller 51 and the folding device which is shown in Figures 3a and 3¾· The folding ' device includes a U-cross-section channel section guide plate 80, carried by supports 8l, a folder plate 82 being located within plate 80 to define a U-shaped opening or passage 83 for the web. The centre of the folder plate 82 lies on a tangent to the wheel 14 and the folding device serves to double the web into a channel and ensures that the web remains folded and is not deformed by the funnel stems 30 which are already in place as the fold is completed. In the course of this folding operation, as illustrated in Figure 3 or Figure 3¾» the rotation of the wheel 14 carrying the action of the cam 35> the cam surface 33 permits them to move radially inwardly towards the wheel Ik. At the same time as this occurs, the clamp plates 37 are lowered with the funnels 29, and are brought into contact with the outer wall of the V-form channel of the web by the cam 0. The clamp plates 37 progress radially inwardly until they are positioned in the pockets formed between adjacent elements 21o 'When they are in their fully retracted position, the clamps 37 hold the web of paper against the radially outer surface of the elliptical stems 30 of the funnels 29· Since the funnels are positioned radially inwardly of the pads 22 of the elements 21, these pads serve to wrap the inner wall of the V-form channel against the radially inner surface of the elliptical funnel stems.
If the double clamp plates 37 ,37 ' of Figure 3a are employed, as indicated above the centre of the former plate 82 lies on a tangent to the wheel, and the clamp plates 37 ' fold the web, while still on the tangent before entering the pockets formed between the projecting elements 24.
The clamps are gradually closed leaving a clearance of about 1/8" (3·2 mm.) to allow additional length of the web to slide through to produce an inclined loop in the pockets. The outer clamp 37 is closed on the centre of the funnel stem 30 when entering between the projecting elements of the wheel.
As the wheel 1 rotates it takes with it the funnel stems 30 and the clamp plates 37,together with the paper web 53· The resiliently outwardly urged pads 22 press the paper web at spaced apart intervals against the inner surface of the heated arcuate member 24. As this occurs, the heat-sealing resin in the paper causes sealing together of the two parts of the web between adjacent funnel stems 30.
If the wheel is caused to rotate, for example at 20 rpm, then, since the member 24 extends for 120° portion of the periphery of the wheel 14, the paper will be held by the pads 22 for approximately one second against the heated plate 24. This ensures a sufficient heating to provide a good heat-sealing between the two halves of the folded over web.
As each funnel enters between the wheel 14 and the member 24, the 4 and also serve to scrape tea out of the grooves 42 and 43· As the wheel progresses further, the funnels 29 are raised by the cam and the stems steadily withdraw from the bottom of the V-form channel of the web 53· As this happens, tea in the stem 30 remains in the pocket stem/ formed by the elliptical(v etm as the stem is withdrawn. By the time the stem of the funnel has reached the downstream end of the cooling member 7» it is fully retracted from between the two halves of the web 53· As the web progresses past the member 27» which may be forcibly cooled, the web itself is cooled and causes a setting of the resin material. Resin material exuding from the paper serves as a lubricant to facilitate movement of the web past the members24 and 27· The web entrained within the pockets of the wheel is of zig-zag form. The roller 47 is driven so that its peripheral speed is in excess of the peripheral speed of the wheel 14, so that the slack caused by the Eig-zag form is removed. The stationary member 7 ' serves as a reaction member against which the roller 47 may act to cause the increase in linear speed of the web On leaving the roller 4 , the web 53, which is still open at the t e) top, passes around| sr disc 48 which is arranged to engage the open top of the web. The disc 48 serves to press the web against a heated member 9 to cause heat-sealing of this open edge. After leaving the disc 48 the web of the, completed tea-bags is wound up onler spool 52, or alternatively it may pass to an apparatus in which it may be cut up into individual tea-bags, and the bags themselves packaged.
Instead of removing the slack in the web by means of a roller 47 , the slack may alternatively be removed by causing the pads 22, mounted on a suitable cam operated pivot, to move at an increased speed as compared with disc; the wheel. In a further form, the/irtiw 48 which provides the upper seam may itself be driven at an increased peripheral speed, as compared with the peripheral speed of the wheel 14/ and be supplied via a loop in the web.
In Figure 4 there is illustrated an alternative arrangement to the with wheel X and being provided with outwardly extending protuberances 61 which force the web in between the pads 22. With this arrangement, the web is deformed by the protuberances 6l. However, this arrangement has the disadvantage that the web on the radially outer surface of the funnels 30 is not protected from the action of the heated member 24.
It will be appreciated that the apparatus of the present invention can readily be used for purposes other than filling tea-bags and may be used for filling any suitable form of sachet, such as sachets commonly used in restaurants for containing sugar, or sachets containing liquid material, such as shampoo.
The apparatus is particularly suitable for feeding alongside the web 5 > as it passes between the wheel Ik and the plate 21, a strip of aluminium about 1 cm. wide and less than O microns thick* This strip will become affixed to the string of bags leaving the machine and bags such as Specification! described and claimed in my Israeli Patent/ No. 15059 be produced.

Claims (3)

1. 28987/2 WHAT WE CLAIM IS:- 1. A heat-sealing apparatus for heat-sealing two portions of web material at spaced apart intervals, such apparatus comprising a rotatable wheel having a plurality of projecting elements extending radially outwardly from the periphery thereof, a heated arcuate member positioned to extend around a portion of the periphery of the wheel to overlie a plurality of said elements, and means for feeding two portions of web material between said elements and said arcuate member.
2. Apparatus according to claim 1, wherein the arcuate member extends for approximately 12Θ* of the circumference of the wheel. 3· Apparatus according to claim 1 or 2, wherein an arcuate cooling member is located adjacent said arcuate heating member, on the downstream side thereof. » Apparatus according to claim 3, wherein said arcuate cooling member extends for approximately 120" of the circumference of the wheel. 5· Apparatus according to any one of the preceding claims, wherein the means for feeding two portions of web material include a folding device adapted to fold a single web so that it is longitudinally doubled upon itself to provide a channel. 6. Apparatus according to claim 5» wherein said folding device includes a U-cross-section channel shaped guide plate and a folder plate located within said guide plate to define therewith a U-shaped opening for the passage of the web. Apparatus according to claim 5 or 6, wherein a set funnels is provided, one funnel for each pocket formed between adjacent projecting elements, said funnels each having a stem which extends within a pocket of the wheel to move round with the wheel between the periphery of the wheel and the arcuate heated member. 8. Apparatus according to claim 7» wherein means are provided for forcing the radially outer portion of the folded eb^ against the funnel as it enters the pockets. 9. Apparatus according to claim 8, wherein said forcing means comprise an endless conveyor or chain positioned immediately upstream of the point at which the web enters the pockets of the wheel, the chain or conveyor being provided with outwardly extending projections 10. Apparatus according to claim 8, wherein said forcing comprise a set of clamps, one clamp being associated with each , the clamps being carried by the wheel to rotate therewith and moved into engagement with 11. Apparatus according to claim 10, wherein a second set of clamps is carried by said wheel, one clamp being associated with each pocket, the clamps being moved into contact with the radially inner portions of the folded web to force it against a funnel as the latter enters the pocket. 12. Apparatus according to any one of claims 7 to 11, wherein means are provided for feeding tea to said funnels approximately at the upstream end of said arcuate heated member. 1
3. Apparatus according to any one of claims 7 to 12, wherein said funnels are carried by supports arranged to lift the funnels
IL28987A 1966-11-29 1967-11-21 Heat-sealing apparatus IL28987A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB53454/66A GB1153779A (en) 1966-11-29 1966-11-29 Heat-Sealing Apparatus

Publications (1)

Publication Number Publication Date
IL28987A true IL28987A (en) 1971-06-23

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IL28987A IL28987A (en) 1966-11-29 1967-11-21 Heat-sealing apparatus

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BE (1) BE707284A (en)
CH (1) CH475130A (en)
DE (1) DE1586283A1 (en)
GB (1) GB1153779A (en)
IL (1) IL28987A (en)
LU (1) LU54988A1 (en)
NL (1) NL6716261A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE29644E (en) 1972-10-27 1978-05-30 Simon-Vk Limited Bag forming machines
GB2116906B (en) * 1982-03-19 1986-02-19 Welton Bag Company Limited Improvements in and relating to heat-sealing
CA1268738A (en) * 1985-12-18 1990-05-08 Hideyuki Takahashi Continuous package train of deoxidizing agent and apparatus for severing packages
ITBO20040415A1 (en) * 2004-07-02 2004-10-02 Ferpack Automatic Di Marchiori PROCEDURE AND EQUIPMENT FOR THE PACKAGING OF MATERIALS IN SACHETS OR SIMILAR
CN117773712B (en) * 2024-02-26 2024-04-26 哈尔滨学院 A loading and unloading device for a bearing inner ring raceway grinder

Also Published As

Publication number Publication date
CH475130A (en) 1969-07-15
LU54988A1 (en) 1968-02-20
GB1153779A (en) 1969-05-29
BE707284A (en) 1968-04-01
NL6716261A (en) 1968-05-30
DE1586283A1 (en) 1970-04-02

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