GB2174333A - Apparatus for continuously welding multiply film webs - Google Patents

Apparatus for continuously welding multiply film webs Download PDF

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Publication number
GB2174333A
GB2174333A GB8606815A GB8606815A GB2174333A GB 2174333 A GB2174333 A GB 2174333A GB 8606815 A GB8606815 A GB 8606815A GB 8606815 A GB8606815 A GB 8606815A GB 2174333 A GB2174333 A GB 2174333A
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GB
United Kingdom
Prior art keywords
housings
hot air
air supply
cooling
housing
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB8606815A
Other versions
GB8606815D0 (en
Inventor
Gunter Mattiebe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
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 Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of GB8606815D0 publication Critical patent/GB8606815D0/en
Publication of GB2174333A publication Critical patent/GB2174333A/en
Withdrawn legal-status Critical Current

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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
    • 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
    • B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
    • 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/348—Avoiding melting or weakening of the zone directly next to the joint area, e.g. by cooling
    • 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
    • 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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81815—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the clamps
    • 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
    • B29C66/90—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
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
    • B29C66/91643—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time following a heat-time profile
    • B29C66/91645—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time following a heat-time profile by steps
    • 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
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9261—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools
    • B29C66/92611—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by controlling or regulating the gap between the joining 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
    • B29C66/80—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
    • B29C66/826—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps without using a separate pressure application tool, e.g. the own weight of the parts to be joined
    • B29C66/8266—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps without using a separate pressure application tool, e.g. the own weight of the parts to be joined using fluid pressure directly acting on the parts to be joined
    • 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
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9261—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools
    • B29C66/92611—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by controlling or regulating the gap between the joining tools
    • B29C66/92613—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by controlling or regulating the gap between the joining tools the gap being kept constant over time
    • 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
    • B29C66/93441—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed the speed being non-constant over time
    • 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
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

In apparatus for continuously welding superimposed plies of thermoplastic synthetic film, which are moved between mutually opposite heaters facing each other, each heater comprises a heat radiator (23, 24), which is mounted in a housing (15, 16), which on that side which faces the plastic film has a slot (17, 18) that extends throughout the length of the heat radiator. Each of the two housings (15, 16) is formed in addition to the slot (17, 18) with at least one inlet (19, 20) opening for admitting hot air, that is introduced into the housing (15, 16) through a hot air supply pipe (21, 22). <IMAGE>

Description

SPECIFICATION Apparatus for continuously welding multiply film webs BACKGROUND OF THE INVENTION Field of the Invention This invention relates to apparatus for continuously welding superimposed plies of thermoplastic synthetic film, which are moved between mutually opposite heaters facing each other, wherein each heater comprises a heat radiator, which is mounted in a housing, which on that side which faces the plastic film has a slot that extends throughout the length of the heat radiator.
Description of the Prior Art Such apparatus is known, e.g., from German Patent Specification 2,145,870. That known apparatus has the disadvantage that the welding power is not sufficient for welding a plurality of quickly traveling film plies. Another disadvantage resides in that the rate at which heat is delivered by the known apparatus to the film cannot be adjusted in dependence on the speed of travel of the film through the welding apparatus so that welds differing in quality will be obtained at different speeds of travel of the film.
Summary of the Invention For this reason it is an object of the invention so to design an apparatus of the kind described first hereinbefore that it will satisfactorily comply with the requirements regarding an adequate transfer of heat and regarding a control of the heat rate in dependence on the speed of travel of the film.
In accordance with the invention that object is accomplished in that each of the two housings is formed in addition to the slot with at least one inlet opening for admitting hot air.
The slots may be replaced by respective rows of outlet orifices.
Desirable further features of the invention are recited in the dependent claims.
Brief Description of the Drawing An illustrative embodiment of the invention will now be described more in detail with reference to the single figure of the drawing showing that embodiment in a perspective view, partly in section.
Two tubular carrier sections 2 and 3 are mounted in a side frame 1 for adjustment in height relative to the film web. For the sake of simplicity the drawing shows only how the carrier section 2 is secured to the side frame 1. The carrier section 3 is similarly connected to the side frame 1. As is apparent from the drawing two brackets 4 and 5 are secured to the tubular carrier section 2 and levers 6 and 7 are pivoted at one end to said brackets 4 and 5, respectively. The other ends of said levers are interconnected by a link 8. An intermediate portion of each of the levers 6 and 7 is connected to a carrier shaft 9 or 10. The carrier shaft 9 is freely rotatably mounted in the side frame 1. The carrier shaft 10 constitutes the output shaft of a stepping motor 11, which is mounted on an angle bracket 12 that is connected by screws to the side frame 1.
It is apparent that the position of the carrier section 2 relative to the film web will depend on the number of steps performed by the stepping motor 11. The carrier section 3 can similarly be adjusted.
The two tubular carrier sections 2 and 3 are made of insulating material and define respective hot air supply passages 13 and 14, which are enclosed on all sides by the carrier sections and by housings 15 and 16. The two housings 15, 16 are formed on confronting sides with air discharge slots 17 and 18, which extend throughout the length of the housings. Those wall portions of the housings 15 and 16 which define the hot air supply passages 13 and 14 are formed with a multiplicity of air inlet openings 19 and 20. Air is blown into the hot air supply passages 13 and 14 through hot air supply pipes 21 and 22 and enters the housings 15 and 16 through the openings 19 and 20 and is discharged from the housings 15 and 16 through the slots 17 and 18. The air is heated by heat radiators 23 and 24, which are mounted in the housings in a manner which is not shown.
The multiply film web 25 is welded by the two air jets discharged through the slots 17 and 18. The spacing of the two housings 15 and 16 is reduced or increased by means of the stepping motors in dependence on the speed of travel of the multiply film web 25 in such a manner that the hot air jet always discharged at a constant rate from the slot will be mixed with a smaller or larger quantity of ambient air in dependence on the spacing of the housings 15, 16 from the cooling bars 38 to 41 so that seam welds of uniform quality will always be obtained. Only one of the two stepping motors is shown and designated 11.
As is apparent from the drawing each of the carrier sections 2 and 3 is embraced by two U-shaped members 26 and 27. For the sake of simplicity, only one of the two Ushaped members embracing each carrier section is shown. The two U-shaped members 26 and 27 are connected to the side frame 1 by bolts 28 and 29, which can be displaced along slots 32 and 33 to adjust the U-shaped members 26 and 27 in height when the screws 30 and 31 have been loosened.
The free ends of the U-shaped members 26 and 27 carry horizontal carrying bars 34, 35, 36 and 37. Each carrying bar is connected to a cooling bar 38, 39, 40 or 41 at that end of the carrying bar which is remote from the Ushaped member. Said cooling bars are hollow and flown through by water. The confronting sides of the cooling bars 38, 39 or 40, 41 of each pair define a triangular free space, which flares toward the adjacent housing 15 or 16.
In dependence on the speed of travel of the multiply film web 25, the housings 15 and 16 extend into said spaces to a larger or smaller depth. In dependence on the number and thickness of the film plies, the bolts 28 and 29 are adjusted to define the positions of the cooling bars 38, 39 and 40, 41.
As has been stated hereinbefore, the spacing of the two housings 15 and 16 is adjusted in dependence on the speed of travel of the film web 25. This adjustment is effected in that the stepping motor is caused to perform a larger or smaller number of steps.
Only the upper stepping motor 11 is shown.
In case of a standstill of the multiply film web 25 the carrier sections 2 and 3 and also the housings 15 and 16 are moved sufficiently apart so that the air discharge slot 17 is disposed above the top of the pair of cooling bars 38 and 39 and the air discharge slot 18 is disposed below the bottom of the pair of cooling bars 40 and 41. Air is still blown out of the slots 17 and 18 during such standstill period but the air jets which are then discharged are deflected. For this purpose, cooling air supply pipes 42 and 43 are connected to the carrying bars 35 and 37 and extend parallel to the carrier sections 2 and 3 and are formed with air discharge slots 44 and 45.
Cold air is blown out through the slots 44 and 45. These two jets of cooling air will then deflect the hot air jets discharged from the slots 17 and 18 so that the hot air jets can no longer impinge on the film web 25.
In the direction of travel of the film web 25 indicated by the arrow A the hot air supply pipes 21, 22 are inclined to include an acute angle with the carrier sections 2 and 3. In the embodiment illustrated by way of example a seam weld is formed only on one side of the film web 25 and the film web 25 remains unwelded in its right-hand portion in the drawing; that portion is supported by a roller table 46. It will be understood that more than one welding apparatus of the kind which is illustrated may be provided so that parallel seams in a selected number can be formed, if desired.

Claims (21)

1. Apparatus for continuously welding superimposed plies of thermoplastic synthetic film, which are moved between mutually opposite heaters facing each other, wherein each heater comprises a heat radiator, which is mounted in a housing, which on that side which faces the plastic film has a slot that extends throughout the length of the heat radiator, wherein each of the two housings is formed in addition to the slot with at least one inlet opening for admitting hot air.
2. Apparatus according to claim 1, wherein the distance between the two housings is variable.
3. Apparatus according to claim 1 or 2, wherein pairs of cooperating cooling bars are disposed between the two housings on opposite sides of the slots beside the latter and extend parallel to the housings.
4. Apparatus according to any of claims 1 to 3, wherein the distance between the cooling bars of one pair thereof to the cooling bars of the other pair thereof is variable independently of the positions of the housings.
5. Apparatus according to any of claims 1 to 4, wherein the cooling bars consist of hollow sections flown through by a liquid coolant.
6. Apparatus according to any of claims 3 to 5, wherein the cooling bars of each pair thereof are fixedly secured to at least two spaced apart U-shaped members, which are mounted on a frame for adjustment in height.
7. Apparatus according to any of claims 3 to 6, wherein the U-shaped members carry cooling air supply pipes, which extend parallel to the cooling bars and have discharge openings which are so disposed that they are adapted to blow cooling air into the space between each pair of cooling bars and the adjacent housing.
8. Apparatus according to any of claims 1 to 7, wherein each housing constitutes a boundary wall of a hot air supply passage which is enclosed on all sides.
9. Apparatus according to claim 8, wherein each housing is formed with a plurality of hot air inlet openings in ~that housing wall which faces the adjacent hot air supply passage.
10. Apparatus according to claim 8 or 9, wherein the hot air supply passages are defined by the housings and by carrier sections consisting of insulating material.
11. Apparatus according to claim 10, wherein each carrier section is adjustable in height and fixedly secured to one of the housings.
12. Apparatus according to claim 10 or 11, wherein each carrier section is provided with at least one hot air supply pipe,
13. Apparatus according to claim 12, wherein each hot air supply pipe is inclined in the direction of travel of the film web and includes an acute angle with the surface of the adjacent carrier section.
14. Apparatus according to any of claims 10 to 13, wherein each carrier section is pivoted to two levers, which are pivotally movable by carrying shafts.
15. Apparatus according to claim 14, wherein the two levers are interconnected by a link.
16. Apparatus according to claim 15, wherein one of said carrier shafts constitutes the output shaft of a stepping motor, which is secured to a side frame, and said output shaft is fixedly connected at one end to one of said levers.
17. Apparatus according to claim 16, wherein the other carrier shaft is mounted at one end directly in the side frame and at its other end carries the other of said levers.
18. Apparatus according to claim 16 or 17, wherein the stepping motor is caused to perform steps in a number depending on the speed of travel of the film to be welded and the distance between the hot air discharge slots or orifices is reduced as the speed of travel is increased.
19. Apparatus according to claim 7 and any of claims 10 to 18, wherein in case of a standstill of the film the two carrier sections are pivotally movable away from each other to be spaced such a distance apart that the cooling air jets discharged by the cooling air supply pipes can pass through the gaps respectively defined by the pairs of cooling bars and the associated housings.
20. Apparatus according to any of claims 3 to 19, wherein the cooling bars of each pair define a triangular free space, which flares toward the adjacent housing, and the adjacent housing extends into said triangular space.
21. Apparatus for continuously welding superimposed plies of thermoplastic synthetic films, substantially as described hereinbefore with reference to and as shown on the accompanying drawing.
GB8606815A 1985-04-10 1986-03-19 Apparatus for continuously welding multiply film webs Withdrawn GB2174333A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3512857 1985-04-10
DE19863606204 DE3606204A1 (en) 1985-04-10 1986-02-26 DEVICE FOR CONTINUOUSLY WELDING MULTI-LAYER FILM LINES

Publications (2)

Publication Number Publication Date
GB8606815D0 GB8606815D0 (en) 1986-04-23
GB2174333A true GB2174333A (en) 1986-11-05

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ID=25831191

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8606815A Withdrawn GB2174333A (en) 1985-04-10 1986-03-19 Apparatus for continuously welding multiply film webs

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DE (1) DE3606204A1 (en)
GB (1) GB2174333A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2202789A (en) * 1987-03-09 1988-10-05 Cestind Centro Studi Ind Sealing device for machines producing filter sachets containing infusion products

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3740426A1 (en) * 1987-11-28 1989-06-08 4 P Nicolaus Kempten Gmbh Device for heating the edge region of a plastic lid
DE9304449U1 (en) * 1993-03-24 1993-05-27 Rovema - Verpackungsmaschinen GmbH, 6301 Fernwald Hot air welding device
DE4315631A1 (en) * 1993-05-04 1994-11-10 Pluemat Plate & Luebeck Gmbh & Co Process and apparatus for welding a port into a plastic bag or the like
US5554252A (en) * 1995-01-27 1996-09-10 The Budd Company Hot and cool air bonding apparatus
DE10019300B4 (en) * 2000-04-19 2006-07-27 Kvt Bielefeld Gmbh Method for welding plastic parts

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GB1144757A (en) * 1966-07-18 1969-03-12 Fibreboard Corp Apparatus and method for heat sealing cartons
GB1502773A (en) * 1974-02-14 1978-03-01 Thames Sack & Bag Co Ltd Heat sealing apparatus

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Publication number Priority date Publication date Assignee Title
US3472721A (en) * 1966-01-24 1969-10-14 Research Inc Apparatus for lap joinder of plastic sheets
DE1604607B2 (en) * 1966-10-10 1973-04-19 Lehmacher, Hans, 5216 Niederkassel DEVICE FOR WELDING THE LAYERS OF THERMOPLASTIC PLASTIC FILMS

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1144757A (en) * 1966-07-18 1969-03-12 Fibreboard Corp Apparatus and method for heat sealing cartons
GB1502773A (en) * 1974-02-14 1978-03-01 Thames Sack & Bag Co Ltd Heat sealing apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2202789A (en) * 1987-03-09 1988-10-05 Cestind Centro Studi Ind Sealing device for machines producing filter sachets containing infusion products
GB2202789B (en) * 1987-03-09 1990-11-07 Cestind Centro Studi Ind Sealing device for machines producing filter sachets containing infusion products

Also Published As

Publication number Publication date
DE3606204A1 (en) 1986-10-16
GB8606815D0 (en) 1986-04-23

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