WO1992020514A1 - Appareil de thermosoudage - Google Patents

Appareil de thermosoudage Download PDF

Info

Publication number
WO1992020514A1
WO1992020514A1 PCT/US1992/004047 US9204047W WO9220514A1 WO 1992020514 A1 WO1992020514 A1 WO 1992020514A1 US 9204047 W US9204047 W US 9204047W WO 9220514 A1 WO9220514 A1 WO 9220514A1
Authority
WO
WIPO (PCT)
Prior art keywords
sealing
drum
bar
blanket
machine
Prior art date
Application number
PCT/US1992/004047
Other languages
English (en)
Inventor
Robert C. James
Original Assignee
Custom Machinery Design, Inc.
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 Custom Machinery Design, Inc. filed Critical Custom Machinery Design, Inc.
Publication of WO1992020514A1 publication Critical patent/WO1992020514A1/fr

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
    • B29C66/83—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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/30—Electrical means
    • B29C65/305—Electrical means involving the use of cartridge heaters
    • 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
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7858—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus characterised by the feeding movement of the parts to be joined
    • B29C65/7879—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus characterised by the feeding movement of the parts to be joined said parts to be joined moving in a closed path, e.g. a rectangular path
    • B29C65/7882—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus characterised by the feeding movement of the parts to be joined said parts to be joined moving in a closed path, e.g. a rectangular path said parts to be joined moving in a circular path
    • B29C65/7885—Rotary turret joining machines, i.e. having several joining tools moving around an axis
    • 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
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7858—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus characterised by the feeding movement of the parts to be joined
    • B29C65/7888—Means for handling of moving sheets or webs
    • B29C65/7894—Means for handling of moving sheets or webs of continuously moving sheets or webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—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
    • B29C66/8145—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81463—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • B29C66/81465—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint one placed behind the other in a single row in the feed direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83421—Roller, cylinder or drum types; Band or belt types; Ball types band or belt types
    • 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
    • B29C66/83517—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums said rollers, cylinders or drums being hollow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C66/841—Machines or tools adaptable for making articles of different dimensions or shapes or for making joints of different dimensions
    • B29C66/8412—Machines or tools adaptable for making articles of different dimensions or shapes or for making joints of different dimensions of different length, width or height
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/851—Bag or container making machines
    • B29C66/8511—Bag making machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91212—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods involving measurement means being part of the welding jaws, e.g. integrated in the welding jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91231—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the joining tool
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
    • 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8221—Scissor or lever mechanisms, i.e. involving a pivot point
    • 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8223—Worm or spindle mechanisms
    • 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9131—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/929—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools characterized by specific pressure, force, mechanical power or displacement values or ranges
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/932—Measuring or controlling the joining process by measuring or controlling the speed by measuring the speed
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/939—Measuring or controlling the joining process by measuring or controlling the speed characterised by specific speed values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7128—Bags, sacks, sachets

Definitions

  • the present invention relates generally to rotary bag making equipment of the type that includes a rotary sealing drum. More specifically, the present invention relates to a unique sealing bar arrangement in which the sealing bar itself is retractable to a position out of contact with plastic film as it passes around the drum.
  • the drum is constructed from a plurality of elongated slats and sealing bar elements (collectively referred to as side elements) which define a segmented outer surface for the drum.
  • the circumference of the drum can be adjusted from a first smaller circumference to a second larger circumference and to any circumference in-between.
  • the drum drive described in the aforementioned Gietman devices includes a blanket which surrounds a portion of the drum, the tension of the blanket against the drum being controlled by a pneumatic cylinder arrangement.
  • the drive therefore is frictional, and the drum itself is driven by the blanket which, in turn, is driven by one of its support rollers.
  • Plastic bags are made from the film tube by making transverse seals periodically at the desired locations. If a film tube is used, the seal becomes the bag bottom. If the "U" is used, the seals form the sides of the plastic bag.
  • a sealing bar contacts film passing between the drum and blanket throughout the time that the film passes to the exit nip.
  • Current machines are extremely fast, 400 feet or more being common, but the machine speed often varies from run-to-run for a variety of reasons.
  • the film After leaving the rotary drum-blanket area, the film, with its seal, passes over a chill roller and proceeds downstream to processing stations, such as folding boards (for reducing the width of the plastic tube) , and to a knife and/or perforation section.
  • processing stations such as folding boards (for reducing the width of the plastic tube)
  • a knife and/or perforation section When perforations are made on the film, the film is usually sent to a winder where the bags are wound into a core or coreless roll. If a knife is used, individual bags can be prepared for subsequent handling, such as by stacking or folding equipment. If a combination cutting knife and perforation system is used, easy dispensing rolled bags can be prepared, as described in the earlier of the aforementioned Gietman patents.
  • a particular feature of the present invention is a method and apparatus for forming high quality seals at high speeds in rotary bag making equipment.
  • Another feature of the invention is to further increase the adaptability of such equipment to make an even larger variety of bags.
  • Another important feature of the invention is its ability to be incorporated into existing equipment, to provide all the benefits available in new equipment embodying the invention.
  • the present invention also features a heating device which produces consistent quality seals, regardless of line speed or film thickness.
  • FIGURE 1 is a schematic view of a prior art rotary bag making machine of the type referred to above in connection with the Gietman patents;
  • FIGURE 2 is an end view of one of the slat and sealing bar support systems according to the preferred embodiment of the present invention
  • FIGURE 3 is a side sectional view of one of the heat sealing bars shown in FIGURE 2, illustrating the preferred retraction mechanism
  • FIGURE 4 is a side view of the sealing bar system shown in FIGURES 2 and 3; and FIGURE 5 is a bottom view of the sealing bar system Shown in FIGURES 2-4.
  • the illustrated sealing drum is one which contains twelve side members (sealing bars and support slats) which are movable with respect to the axis of the drum to create many different possible drum diameters.
  • the present invention could be embodied in this fashion, or could be employed in a drum system with more or less side members or with a drum system which includes fixed external members. The latter type of system might be employed, for example, in a plant designed to produce only a limited number of bag products.
  • FIGURES also illustrate the present invention used in connection with a sealing drum which is manually adjustable (such as that shown in the Gietman '084 patent) , but the principles of the present invention could also be applied to motor driven adjustable drum system (such as that shown in the aforementioned Gietman •993 patent).
  • the illustrated machine does not include the motor because the illustrations are more easily understood with the more simple machine, but it is believed the most important commercial application of the invention will be in connection with motorized expandable drum systems.
  • the bag making machine 10 of FIGURE 1 includes a dancer and idler assembly 12, a sealing drum and blanket assembly 14, a chill roll 16, a comparator unit 15, a punching station 17, a folding station 18, a pull-roll system 20, a perforator/cutting station 22 and a phase variator assembly 24.
  • Film is fed from a source of plastic tubing through dancer roll 12A and idler roll 12B into the sealing drum and blanket assembly 14.
  • the source may be a film extruder or a roll of plastic film tubing.
  • the dancer roll 12A and idler roll 12B maintain proper tension on the film and may assist in controlling the machine speed by being connected to a potentiometer.
  • the sealing drum and blanket assembly 14 consists of a cylindrical drum 28, which is capable of being varied in diameter. That feature is illustrated in FIGURE 1 by the dotted line. A number of sealing bars 30 are also shown in FIGURE 1, and periodically form transverse seals across the flattened film tube 11. Sealing bars 30 are of conventional design and are described in detail in the Gietman '084 patent.
  • a blanket 32 is mounted on rollers 34, 35, 36 and 37 for surrounding a portion of drum 28 in such a way that the film passes between blanket 32 and drum 28 while seals are being formed. Rollers 34 and 35 are mounted to an elongate frame 39 which is pivotable between the full and dotted line position shown in FIGURE 1.
  • Frame 39 includes a perpendicular plate 40 near its mid-section, the latter being coupled to an air cylinder 42 having an extensible rod 43. It will be appreciated that extension of rod 43 causes rollers 34 and 35 to move to the dotted line position when the drum diameter decreases, thereby maintaining tension of the blanket 32 against the drum 28.
  • Roller 37 is driven from a motor 44 by belt 45 to drive blanket 32 and, in turn, blanket 32 will rotate drum 28 due to the friction between these components.
  • the specific construction of drum 28 will be discussed in more detail below.
  • the film After passing the chill roll, the film next passes through an optional punching station 17, which may punch preselected hole or handle configurations in the film.
  • the final element shown in FIGURE 1 is the variator system 24, which is driven from a gear box 63 by belt 64. Gear box 63 is driven by the drum 28 through belt 65.
  • Variator system 24 also includes handwheels 66 and 67, used to vary the phase of the perforator/cutting station 22 and the punching station 17, respectively. Adjustments to the phase of perforator/cutting station 22 are made by handwheel 62 via belt 55. Similar adjustments to handwheel 67 are communicated to punching station 17 by belt 68. It should be recognized that the variators may be adjusted while the bag making machine 10 is in operation.
  • Drum 28 is generally cylindrical and is comprised of a plurality of elongated slats 70, each of which has a steel base and a slightly convexly curved exterior surface.
  • a rubber lagging 71 is provided on the exterior surface to as ⁇ ist in maintaining proper traction between blanket 32 and drum 28.
  • the drum also includes one or more elongated sealing bar assemblies 73.
  • Drum 28 also includes a pair of generally circular end plates 75 and an axial shaft 77 extending through the center of drum 28.
  • Shaft 77 is mounted in suitable bearings (not shown) to permit free rotation of drum 28 about it axis.
  • the illustrated device is driven by a blanket, although the reverse situation could easily be used, i.e., driving the drum to cause frictional movement of the blanket.
  • Twelve mounting plates 79 having holes therein are attached to the interior sides of each of the end plates 75 near the outer edge thereof, the axis of the openings of each plate 79 being radial with respect to the shaft 77.
  • Similar plates 80 are affixed in plates 75 inwardly of plates 79, so that the twelve pairs of spaced apart mounting plates (79 and 80) are disposed equidistantly around each end plate 75.
  • a threaded rod 82 is placed through the holes in each pair of plates 79 and 80, one end of which extends outwardly therefrom and terminates in a hex nut 84.
  • a miter gear 85 is mounted -on the inner end of each of rods 82. Rotation of miter gear 85 results from rotation of rods 82.
  • a pair of ring gears 88 are rotatably mounted to a machined hub of end plate 75 on bearings 89 and are constructed and arranged to mesh with miter gears 85. It " will be apparent, then, that rotation of any one of the rods 82 causes rotation of the ring gears 88 and, in turn, rotation of all twelve of the threaded rods 82 which are coupled to that particular ring gear.
  • Slats 70 and sealing bar elements 73 are coupled to the threaded rods 82 by a threaded plate 92 fastened to each end of slats 70 and elements 73.
  • Rotation of rods 82 will cause plates 92 to travel up and down the length of the rods. Rotation of the rods in one direction will cause the side members to move radially inward, thereby reducing the drum diameter, while rotation in the opposite direction will cause a drum diameter expansion.
  • rod rotation can be accomplished automatically by a motor driven system as shown in the Gietman '993 patent, or manually by rotating the hex nut 84 affixed to the outer end of any of the rods 82. Such manual rotation could be caused by any type of wrench or other grasping tool.
  • FIGURE 3 the sealing bar mechanism is shown in greater detail.
  • the sealing bar 30 is shown mounted for extension and retraction in a bracket channel 90 which is generally U-shaped and which includes lagging pads 92 on the outer ends thereof. Pads 92 are spaced apart from bar 30 to permit movement of the bar therebetween.
  • a cylinder containment bracket 94 is located beneath channel 90 and is bolted thereto by bolts 95.
  • the brackets are constructed and arranged to receive a pancake type pneumatic cylinder 97, having a piston rod 98 extending upwardly therefrom and through the channel 90.
  • Piston rod 98 is coupled to the seal bar 30 by having a threaded end (not shown) received in a threaded receptacle (not shown) in the bottom of the seal bar. The combination is locked in place with hex nut 99. The cylinder itself is held in the containment bracket by bolts 100.
  • the throw of the piston rod should be such that when extended, the tip 102 of bar 30 extends beyond the lagging by an amount sufficient to permit sealing, about 0.085 inches in the preferred embodiment. It should also be selected so that when retracted, tip 102 will be spaced below the plane of the lagging pads 92 by a distance sufficient to prevent its playing any further role in the heat sealing process.
  • FIGURE 4 A side view of the sealing bar assembly is shown in FIGURE 4, which also illustrates the power line 103 for supplying heat to bar 30, and a thermocouple line 105 which is used to monitor the heat of the bar 30. Also shown in greater detail in this FIGURE are the rods 82, plates 79, hex nut 84, and the end plates 75 previously described.
  • FIGURE 5 A bottom view of the sealing bar assembly is shown in FIGURE 5.
  • FIGURES 4 and 5 show two cylinders 97, but it should be mentioned here that a larger number could be used. The number is dictated primarily by the length of the seal bar. Some machines manufactured by the assignee of the present invention have five of such cylinders.
  • the bottom view illustrates many of the above- described components and also the air supply system for cylinders 97.
  • That system includes a supply of compressed air (not shown) , having an inlet line 107 to a tee 108 which, in turn, has lines 110 extending to the pneumatic inlets, a pair of solenoid valves 112. Valves 112 are placed near the cylinders 97 to permit high speed operation thereof, which is also assisted using the conventional pneumatic technique of bypassing valves 112 with the exhaust from cylinder 97.
  • Other pneumatic arrangements could readily be substituted for the one shown, which does not in and of itself form part of the present invention.
  • a timer 120 electrically coupled to valves 112 by line 122 and, in turn, coupled to a processing unit 125 (for example, a Giddings and Lewis PIC 900 programmable logic controller with motion control) adapted to establish the seal bar extension time for a particular bag making operation.
  • a processing unit 125 for example, a Giddings and Lewis PIC 900 programmable logic controller with motion control
  • Input to unit 125 may be from a speed sensor 127 which is designed to measure the line speed of the machine 10.
  • Unit 125 could be programmed with the necessary information (discussed in greater detail below) to automatically set the timer from a set of known data inputs (speed, film characteristics, bar temperature, etc.) or unit 125 could be eliminated altogether in situations where the timer is manually set, once such input factors have been determined and the calculation made as to the most appropriate dwell time for the bag making operation to be carried out.
  • Another advantage of the present invention is to employ the sealing bar extension-timer system as a way of increasing the length of bags which can be made on a particular machine. For example, for a drum having a 30" circumference, and using present equipment, the largest bag which could be made would be 30 inches, assuming only a single active sealing bar.
  • the valves 112 of the present invention By setting actuation of the valves 112 of the present invention to extend sealing bar 30 for the ' same dwell time, but at different intervals, e.g., every two or three rotations, bags of 60 or 90 inch lengths could be prepared.
  • the present invention provides a unique system for preparing a nearly infinite number of bag sizes.
  • a 70 millisecond dwell time has been found desirable for a double layer of high density polyethylene material to be sealed to form trash bags.
  • the seal bar tip temperature should be in the range of 320°F to 340°F and a seal pressure of approximately 45 psi.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
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Abstract

Cette invention concerne une barre de soudage rétractable (80) destinée à être utilisée dans une machine rotative fabriquant des sacs qui utilise une commande (32) de blanchet entourant un tambour (28) rotatif de soudage. En commandant le temps d'arrêt, c'est-à-dire le temps de contact entre la barre (14) de soudage et le film plastique (11) supporté entre le tambour et le blanchet on obtient de meilleures soudures. Dans cette invention tous les éléments nécessaires pour effectuer une bonne soudure sont commandés, tels que la température, le temps d'arrêt, la pression et le temps de refroidissement.
PCT/US1992/004047 1991-05-21 1992-05-12 Appareil de thermosoudage WO1992020514A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US70362791A 1991-05-21 1991-05-21
US703,627 1991-05-21

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012055414A1 (fr) * 2010-10-27 2012-05-03 Roll-O-Matic A/S Procédé et appareil de soudage mutuel de deux feuilles de matériaux thermosoudables

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB753374A (en) * 1953-10-05 1956-07-25 Milprint Inc Improvements in or relating to the art of making bags from thermo-plastic sheet material
FR1551880A (fr) * 1967-06-21 1969-01-03
FR1575380A (fr) * 1967-08-04 1969-07-18
US3769135A (en) * 1970-07-22 1973-10-30 Owens Illinois Inc Base sealer method
DE2255636A1 (de) * 1972-11-14 1974-05-16 Union Carbide Corp Rotationshitzeversiegeler
US3996093A (en) * 1971-12-17 1976-12-07 Windmoller & Holscher Apparatus for producing transverse weld seams in a two-ply web of plastic film
FR2460843A1 (fr) * 1979-07-05 1981-01-30 Nordson Corp Machine a former des paquets et a les fermer par soudage des bords d'une enveloppe tubulaire
US4934993A (en) * 1988-05-15 1990-06-19 Custom Machinery Design, Inc. Bag making apparatus with automatic compensation system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB753374A (en) * 1953-10-05 1956-07-25 Milprint Inc Improvements in or relating to the art of making bags from thermo-plastic sheet material
FR1551880A (fr) * 1967-06-21 1969-01-03
FR1575380A (fr) * 1967-08-04 1969-07-18
US3769135A (en) * 1970-07-22 1973-10-30 Owens Illinois Inc Base sealer method
US3996093A (en) * 1971-12-17 1976-12-07 Windmoller & Holscher Apparatus for producing transverse weld seams in a two-ply web of plastic film
DE2255636A1 (de) * 1972-11-14 1974-05-16 Union Carbide Corp Rotationshitzeversiegeler
FR2460843A1 (fr) * 1979-07-05 1981-01-30 Nordson Corp Machine a former des paquets et a les fermer par soudage des bords d'une enveloppe tubulaire
US4934993A (en) * 1988-05-15 1990-06-19 Custom Machinery Design, Inc. Bag making apparatus with automatic compensation system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012055414A1 (fr) * 2010-10-27 2012-05-03 Roll-O-Matic A/S Procédé et appareil de soudage mutuel de deux feuilles de matériaux thermosoudables

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