WO2002060675A1 - Soudeuse de feuilles - Google Patents

Soudeuse de feuilles Download PDF

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Publication number
WO2002060675A1
WO2002060675A1 PCT/JP2001/000572 JP0100572W WO02060675A1 WO 2002060675 A1 WO2002060675 A1 WO 2002060675A1 JP 0100572 W JP0100572 W JP 0100572W WO 02060675 A1 WO02060675 A1 WO 02060675A1
Authority
WO
WIPO (PCT)
Prior art keywords
welding
sheet
compressed air
discharge pipe
edges
Prior art date
Application number
PCT/JP2001/000572
Other languages
English (en)
French (fr)
Inventor
Kanji Ito
Original Assignee
Nihon Kanko Co., Ltd.
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 Nihon Kanko Co., Ltd. filed Critical Nihon Kanko Co., Ltd.
Priority to US10/466,542 priority Critical patent/US20040056077A1/en
Priority to JP2002560846A priority patent/JPWO2002060675A1/ja
Priority to DE10197184T priority patent/DE10197184T5/de
Priority to PCT/JP2001/000572 priority patent/WO2002060675A1/ja
Publication of WO2002060675A1 publication Critical patent/WO2002060675A1/ja

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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
    • B29C66/01—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
    • 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
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • 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
    • B29C65/82—Testing the joint
    • 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
    • B29C65/82—Testing the joint
    • B29C65/8207—Testing the joint by mechanical methods
    • B29C65/8246—Pressure tests, e.g. hydrostatic pressure tests
    • 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
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • 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
    • B29C66/349—Cooling the welding zone on the welding spot
    • B29C66/3494—Cooling the welding zone on the welding spot while keeping the welding zone under pressure
    • 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
    • B29C66/80—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
    • B29C66/83—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
    • B29C66/8362—Rollers, cylinders or drums moving relative to and tangentially to 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/865—Independently movable welding apparatus, e.g. on wheels
    • B29C66/8652—Independently movable welding apparatus, e.g. on wheels being pushed by hand or being self-propelling
    • B29C66/86521—Independently movable welding apparatus, e.g. on wheels being pushed by hand or being self-propelling being self-propelling
    • B29C66/86523—Independently movable welding apparatus, e.g. on wheels being pushed by hand or being self-propelling being self-propelling the traction being made on the seam
    • 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
    • B29C66/9141—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 temperature
    • B29C66/91421—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 temperature of 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
    • B29C66/90—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
    • B29C66/91—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
    • B29C66/9192—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 in explicit relation to another variable, e.g. temperature diagrams
    • B29C66/91921—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 in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature
    • B29C66/91931—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 in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature in explicit relation to the fusion temperature or melting point of the material of 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
    • 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
    • B29C66/71—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 composition of the plastics material 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
    • 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
    • B29C66/81411—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81423—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being concave
    • 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
    • B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
    • B29C66/93431—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed the speed 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
    • B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
    • B29C66/93451—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed by controlling or regulating the rotational speed, i.e. the speed of revolution

Definitions

  • the present invention relates to a sheet welding machine, and more particularly, to a sheet welding machine that continuously welds edges of two sheet materials using a wedge-shaped heating tool and a pressure roller.
  • Thermo-weldable thermoplastic resin sheet material such as vinyl chloride resin sheet etc.
  • Waterproof sheet for improving ground, waterproofing, draining or protecting structures such as tunnels, or film material forming dome or tent It has been put to practical use in civil engineering and construction work.
  • a waterproof sheet over a wide area, in general, the edges of a plurality of waterproof sheets are overlapped with each other and the edges are heat-sealed to each other, whereby a continuous waterproof sheet having a wide area is applied. can do.
  • Examples of a heat welding machine for welding sheet materials are disclosed in, for example, JP-A-10-128850 (Japanese Patent Application No. 8-289666) and JP-A-7-314558 (Japanese Patent Application No. 6-137371). 2.
  • a sheet welding machine of the type includes a pair of upper and lower pressing rollers and a heating device for heating an edge of the sheet material. The edges are narrowed between the pressure rollers and joined together.
  • This type of sheet welder is configured to join the edges of two sheets by a row of heat welding zones.
  • Another type of sheet welding machine is a double-row type, in which the edges of the sheet material are joined by two parallel rows of welding zones.
  • Sheet welding machines are known. Forms a continuous unwelded portion between the left and right weld zones, and the unwelded portion forms a continuous channel capable of enclosing air. Compressed air for inspection is sealed in the channel after the welding operation is completed, and the welding zone is inspected for bonding failure.
  • FIGS. 5A and 5B are a perspective view and a cross-sectional view illustrating a welding mechanism of the double-row sheet welding machine
  • FIG. 6B is a plan view illustrating a method of inspecting a welded sheet.
  • the welding mechanism 50 of the sheet welding machine as shown in FIGS. 5A and 5B includes a wedge-shaped heating tool 55 having a built-in electric heating wire (not shown), and is disposed near the tip of the heating tool 55.
  • Upper and lower pressure rollers 51R, 52R: 51L, 52L are provided.
  • Press rollers 51R, 51L: 52R, 52L are interconnected by a small diameter shaft 53.
  • a plate-like tongue piece 54 extending forward from the converging portion 59 of the heating tool 55 projects forward between the upper and lower shaft portions 53.
  • the pressure rollers 51:52 are rotationally driven in the direction of the arrow by the driving torque of the electric motor 56, and the sheets W1: W2 relatively move in the direction of the arrow as shown in FIG. 6A.
  • the upper and lower surfaces of the high-temperature heating tool 55 are brought into contact with each other and melted by heat. As shown in FIG.
  • an unwelded portion C is formed between the left and right welding zones B1: B2.
  • the unwelded portion C constitutes a continuous channel capable of containing compressed air for inspection.
  • the inspection after the welding operation is completed is performed by airtightly processing the end E of the channel C and piercing the inspection needle 60 having the compressed air flow channel 61 into the channel C as shown in FIG. 6B. .
  • the air discharge holes 62 of the flow path 61 discharge the compressed air CA into the channel C, and fill the channel C # with the compressed air. If there is a poor welding position in the welding zone B, the compressed air leaks to the outside world. be able to.
  • the joining width X of the sheet edge portion needs to be a relatively large dimension exceeding the entire width of the welding mechanism including the two rows of pressure rollers and the shaft between the rollers. .
  • the overlap width X of the sheet is large, and waste of the sheet material occurs.
  • the welding mechanism having the above structure has two rows of pressure rollers spaced apart from each other. A difference in rotation occurs between the rollers, making it difficult to smoothly change the direction.
  • the present invention provides a method for continuously welding the edges of two sheet materials by a wedge-shaped heating tool and a pressure roller, and for inspecting a welding defect of a welding zone.
  • a sheet that forms a fluid-filled channel between two rows of welding zones In the welding machine, a wedge-shaped heating tool (15) for thermally transferring and melting the edges by contacting the edges (A1: A2) of the upper and lower sheet materials (W1: W2), and convergence of the heating tools
  • a sheet welding machine characterized by discharging compressed air (CA).
  • CA compressed air
  • the compressed air discharge pipe separates the upper and lower sheet materials in contact with the discharge pipe, and forms a continuous unwelded zone by the compressed air discharged from the front end.
  • the unwelded zone forms a continuous channel (C) that divides the weld zone (B1: B2) formed by the pressure roller into right and left, and compressed air is sealed in the channel.
  • two rows of welding zones can be formed by a single row of pressing rollers, so that the overlap width (joining width X) of the sheet edge is equal to that of a single pressing roller. It can be reduced or reduced to dimensions slightly beyond the width. Furthermore, the sheet welding machine having a single row of pressure rollers eliminates the difficulty of changing the direction due to the rotation difference between the left and right rollers, so that the direction can be smoothly adjusted according to the bending or turning of the welding zone. Can be converted.
  • a metal cylindrical roller is used as the pressure roller.
  • the pressure roller is made of a heat-resistant resin, rubber or elastomeric cylindrical roller.
  • a circumferential groove (40) may be formed in the area of the pressure roller corresponding to the compressed air discharge pipe. The circumferential groove connects the discharge pipe The compressive force of the inserted sheet material portion is locally released, thereby facilitating the formation of the channel by elastic deformation of the sheet material portion.
  • the compressed air discharge pipe is formed of a metal pipe having a circular cross section, and a distal end surface of the discharge pipe forms a true circular opening.
  • the tip of the discharge pipe may be flattened and widened in the width direction, and the tip of the discharge pipe may be formed into an elliptical or elliptical opening.
  • the present invention is to continuously weld the edges of two sheet materials with a wedge-shaped heating tool and a pressure roller to form two rows of welding zones and to form a fluid-fillable channel.
  • a compressed air discharge pipe is arranged in a central region of a wedge-shaped heating tool, While the compressed air is being discharged from the heater, the edge of the sheet material is heated and melted by the heating tool, and the edge is narrowed by the pressure roller.
  • FIG. 1A is an overall perspective view of a sheet welding machine showing a preferred embodiment of the present invention
  • FIG. 1B is a perspective view showing a welding mechanism of the sheet welding machine.
  • FIG. 2A is a front view of the welding mechanism
  • FIG. 2B is a plan view of the welding mechanism.
  • FIG. 3A is a cross-sectional view taken along line II of FIG. 2A
  • FIG. 3B is a cross-sectional view taken along line II-II of FIG. 2A.
  • 4A is a perspective view showing a structure of a distal end portion of the air discharge pipe shown in FIG. 1
  • FIG. 4B is a perspective view showing a modification of the air discharge pipe
  • FIG. 1A is an overall perspective view of a sheet welding machine showing a preferred embodiment of the present invention
  • FIG. 1B is a perspective view showing a welding mechanism of the sheet welding machine.
  • FIG. 2A is a front view of the welding mechanism
  • FIG. 2B is a plan view of the welding
  • FIG. 4C is a heating port of the welding mechanism. It is a front view which shows the modification of a roller.
  • 5A and 5B are a perspective view and a front view showing a conventional welding mechanism.
  • FIG. 6A is a cross-sectional view taken along the line III-III of FIG. 5B, and
  • FIG. 6B is a plan view showing a method of inspecting a sheet welded using a conventional welding mechanism.
  • the sheet welding machine 1 includes an operation handle portion 2 that can be gripped by fingers, a main body 3 integrally connected to the handle portion 2, and an electric motor 4 attached to the main body 3.
  • the power cord 5 is connected to the tip of the handle 2.
  • Side cover 6 force of body 3 Attached to both sides of body 3, welding mechanism 10 is arranged inside side cover 6.
  • the welding mechanism includes a pair of upper and lower pressure rollers 11, 12, a wedge-shaped heater 15, and a compressed air discharge pipe 20.
  • the power cord 5 is connected to a battery, an external power supply or a transformer, and the main body 5 has a built-in electric circuit 30 (FIG. 3) for receiving supplied power.
  • the electric circuit 30 includes a manual operation switch 7 for manually operating the electric motor 4 and the heating tool 15, a speed control means for controlling the rotation speed or the speed change mechanism of the electric motor 4, and a temperature control means for controlling the surface temperature of the heating tool 15. Further, an air amount control means for controlling the air discharge amount of the compressed air discharge pipe 20 is provided, and the operation of the electric motor 4 and the heating tool 15 is controlled.
  • a power transmission mechanism 9 (FIG. 3) for transmitting the rotation of the drive shaft of the electric motor 4 to the center shafts 13 and 14 of the pressure rollers 11 and 12 is provided on the inner surface of the side cover 6. The driving torque is converted into rotation of the pressure rollers 11 and 12 in the direction indicated by the arrow. As shown in FIG.
  • the heating tool 15 constituting the welding mechanism 10 is a nip between the pressure rollers 11 and 12.
  • the compressed air discharge pipe 20 is formed into a wedge shape that converges at the pump portion, penetrates through the center of the heating tool 15 in the width direction, and projects forward from the converging portion 19.
  • the heating tool 15 has a built-in electric heating wire 16, and the electric heating wire 16 is connected to an electric circuit 30.
  • the upper surface 17 and the lower surface 18 of the heating tool 15 are heated by the conduction of the electric heating wire 16.
  • the pressure rollers 11 and 12 are arranged close to the converging portion 19 and positioned vertically symmetrically with respect to the center plane of the heating tool 15.
  • a knurling force S is applied to the outer peripheral surface of each of the pressure rollers 11 and 12.
  • the converging portion 19 extends into the gap between the pressure rollers 11 and 12 and converges.
  • the nip dimension N of the pressure rollers 11 and 12 is set to a dimension that narrows the sheet material W1: W2 to an appropriate thickness, and the compressed air discharge pipe 20 penetrates the center of the heating tool 15 and nips. Extend to within.
  • the base end of the discharge pipe 20 is connected to a compressor 22 via a compressed air supply pipe 21, and the front end 25 of the discharge pipe 20 passes through the nip gap between the pressure rollers 11 and Ends slightly ahead of the
  • the compressor 22 constituting the compressed air source may be built in the portion of the main body 3 or may be arranged outside the apparatus and connected to a control valve in the main body 3 via a compressed air conveying pipe.
  • FIG. 4A illustrates the shape of the distal end portion 25 of the compressed air discharge pipe 20.
  • the distal end portion 25 has a circular cross section obtained by cutting the discharge pipe 20 vertically, and discharges the compressed air in the discharge pipe 20 forward.
  • the tip 25 which reduces the height dimension P of the tip 25 may be flattened and formed into a horizontally long elliptical or oval cross section.
  • the diameter of the discharge pipe 20 has a predetermined diameter in the range of 0.5 to 3.0 thighs, for example, a diameter of 2 band, and the air pressure of the compressed air is 1.5 to 3.Okg / cin 2 (G ), For example, 2. Okg / cm 2 (G).
  • the sheet material W1: W2 generally has a thickness in the range of 1.0 to 5.0 thighs, and usually has a thickness of about 2.0 to 3.0 thighs. Used at construction sites.
  • the Ep size N of the pressure rollers 11 and 12 is set to a size of about 1.5 to 7.0 IM1, preferably set to a size of about 3.0 to 5.0 mm.
  • the width of the pressure rollers 11 and 12 is 10I! The size is set within a range of about 40 mm, preferably 15 mm or less. If desired, the width of the pressure rollers 11, 12 can be set to about 10IM Noh.
  • a metal cylinder or a cylinder made of heat-resistant resin, rubber, or elastomer is used as the pressure rollers 11 and 12.
  • the use of a resin, rubber or elastomer roller is advantageous because the swelling of the portion where the air discharge pipe 20 is disposed can be absorbed to some extent by the elastic deformation of the roller surface.
  • the resin, rubber or elastomer forming the roller one having a heat resistance temperature of 300 ° C. or more, preferably 500 ° C. or more is employed.
  • the sheet welding machine 1 is set at a joint between two sheet materials A1 and A2.
  • the upper sheet material W1 is inserted into the nip N of the pressure rollers 11, 12 along the upper surface of the heating tool 15, and the lower sheet material W2 is inserted along the lower surface of the heating tool 15, Inserted into nip N of 12.
  • the electric heating wire 16 of the heating tool 15 is energized, and the upper and lower surfaces of the heating tool 15 can be heated to the melting temperature of the sheet material W1: W2. .
  • the electric motor 4 is further operated.
  • the upper and lower pressure rollers 11, 12 rotate in the direction of the arrow, draw the sheet material W1: W2 between the nips, and narrow the pressure.
  • the sheet materials W1 and W2 whose opposing surfaces are thermally melted are pressed under the pressure of the pressure rollers 11 and 12 and joined.
  • the compressed air discharge pipe 20 continues to discharge the compressed air.
  • the compressed air discharged from the distal end portion 25 of the discharge pipe 20 locally cools the hot-melted sheet material W1: W2, and the compressed air flow prevents mutual adhesion between them.
  • a channel C having a predetermined width Y around the axis of the discharge pipe 20 is formed, and two rows of welding zones B1: B2 are formed on both sides of the channel C.
  • the front end E of the channel C is kept airtight.
  • welding defects that may occur during the welding operation can be immediately found on the spot. That is, when a poor welding position occurs, the air pressure in the channel C sharply drops, and the sheet material W1: W2 in the channel C portion immediately loses air elasticity or repulsive force. It is only necessary to interrupt the welding and repair the defective welding spot immediately.
  • the sheet material Wl may slightly exceed the width of the single rollers 11 and 12, and the joining width X (overlapping margin) of W2 may be ensured. The joint width of W2 can be reduced, and the sheet material can be used effectively.
  • FIG. 4C is a front view showing a modification of the welding mechanism 10.
  • the pressure rollers 11 and 12 of this example have a locally reduced diameter at the center in the width direction, and a circumferential groove 40 having an arc-shaped cross section extending over the entire circumference of the caropressure rollers 11 and 12 is provided with a compressed air discharge pipe. It is formed at a position corresponding to 20.
  • the upper and lower circumferential grooves 40 allow the sheet material W1: W2 to be elastically deformed, and facilitate the formation of the channel C by the discharge pipe 20.
  • the circumferential groove 40 may be formed in a concave (square) cross-sectional shape.
  • the supporting structure of the discharge pipe which can variably control or adjust the protrusion size of the compressed air discharge pipe from the converging portion or the position of the protruding pipe tip, may be changed as appropriate.
  • the structure of the heater and the discharge pipe can be designed so that the heater is supported on the heater so as to be relatively displaceable.
  • a sheet welding machine capable of performing a welding defect detection while a welding operation is in progress.
  • ADVANTAGE OF THE INVENTION The sheet welding machine of this invention reduces the joining width

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
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  • High Energy & Nuclear Physics (AREA)
  • Plasma & Fusion (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

明 細 書
シート溶着機
技術分野
本発明は、シート溶着機に関するものであり、より詳細には、楔型加熱具及び 加圧ローラにより 2枚のシート材料の縁部を連続的に溶着するシート溶着機に 関するものである。
冃景技
熱溶着可能な塩化ビニル榭脂シート等の熱可塑性樹脂シート材料力 地盤 の改良、トンネル等の構造物の止水、排水又は保護のための防水シートとして、 或いは、ドーム又はテントを形成する膜材料として、土木又は建築工事におい て実用に供されている。広範な領域に防水シートを施工する場合、一般には、 複数の防水シートの縁部を互いに重ね合せた状態で縁部同士を互いに熱溶 着し、これにより、連続する広域面積の防水シートを施工することができる。 シート材料を溶着する熱溶着機として、例えば、特開平 10— 128850号（特 顧平 8— 289666号）又 (ま特開平 7— 314558号（特願平 6— 13371 3号）に 開示される形式のシート溶着機が知られている。シート溶着機は、上下一対の 加圧ローラと、シ ト材料の縁部を加熱する加熱具とを備える。加熱具によつて 熱溶融したシート材料の縁部は、加圧ローラの間で狭圧され、一体的に接合さ れる。この形式のシート溶着機は、一列の熱溶着帯によって二枚のシートの縁 部を接合するように構成されており、このため、溶着帯の接合不良を容易に検 査し難い欠点がある。 他の形式のシート溶着機として、平行な二列の溶着帯によってシート材料の 縁部を接合する複列式のシート溶着機が知られている。複列式シート溶着機 は、連続する未溶着部分を左右の溶着帯の間に形成し、未溶着部分は、空 気を封入可能な連続チャンネルを形成する。検査用圧縮空気が、溶着作業 完了後にチャンネル内に封入され、溶着帯の接合不良の検査が実施される。 溶着帯の溶着不良又は欠陥等が生じていた場合、圧縮空気は溶着不良部分 から漏出するので、溶着不良箇所の補修、或いは、再度の溶着作業を行うこと が可能となる。 図 5 A、図 5 B及び図 6 Aは、複列式シート溶着機の溶着機構を示す斜視図 及ぴ断面図であり、図 6Bは、溶着したシートの検査方法を示す平面図である。 図 5A及ぴ図 5Bに示す如ぐシート溶着機の溶着機構 50は、電気発熱線 (図示せず）を内蔵した楔型加熱具 55を備えるとともに、加熱具 55の先端部 近傍に配置された上下の加圧ローラ 51R、 52R : 51L、 52Lを備える。左右の 力]]圧ローラ 51R、 51 L : 52R、 52Lは、小径軸部 53によって相互連結される。 加熱具 55の収斂部 59から前方に延びる板状舌片 54が、上下の軸部 53の間 力 前方に突出する。 加圧ローラ 51 : 52は、電動モータ 56の駆動トルクによって矢印方向に回転 駆動し、シート W1 : W2は、図 6Aに示す如 矢印方向に相対移動する。上下 のシート W1 : W2の縁部 Al : A2力 高温の加熱具 55の上面及び下面に接触 して熱溶融し、上下の加圧ローラ 51 : 52の間で狭圧され、圧着する。図 5Bに 示すように、舌片 54が、溶着機構 50の中心部においてシート W1 : W2を分離 する結果として、未溶着部分 Cが、左右の溶着帯 B 1 : B2の間に形成される。 未溶着部分 Cは、検査用圧縮空気を封入可能な連続チャンネルを構成する。 溶着作業完了後の検查は、図 6Bに示す如く、チャンネル Cの端部 Eを気密 処理し、圧縮空気流路 61を備えた検査針 60をチャンネル Cに突刺すことによ り実施される。流路 61の空気吐出孔 62は、圧縮空気 CAをチャンネル C内に 吐出し、チャンネル C內に圧縮空気を充填する。溶着帯 Bの溶着不良箇所が 存在した場合、圧縮空気が外界に漏出するので、溶着不良の有無を検出する ことができる。 しかしながら、このような溶着方法では、溶着不良の検査は、全溶着工程が 完了した後に実施しなければならず、し力も、このような段階では、溶着不良を 検出し得たとしても、溶着箇所を具体的に特定し難 このため、溶着不良箇 所を発見すべく再検査を実施するか、或いは、疑わしい溶着部分を含めて広 範な接合帯部分を再溶着しなければならない。
.また、上記構造の溶着機構によれば、シート縁部の接合幅 Xは、 2列の加圧 ローラ及びローラ間の軸部を含む溶着機構の全幅を超えた比較的広幅の寸 法を要する。このため、シートの重ね合せ幅 Xが大きく、シート材料の無駄が生 じる。 更に、上記構造の溶着機構は、相互間隔を隔てた 2列の加圧ローラを備える こと力ら、溶着帯がシート形状に相応して転向又は湾曲する場合、溶着機の方 向転換時に左右のローラに回転差が生じ、円滑に方向転換し難い。 本発明は、力かる課題に鑑みてなされたものであり、その目的とするところば、 溶着作業と同時に溶着不良検査を実施することができるシート溶着機を提供 することにある。 本発明は又、シートの接合幅を減少し、シート材料の有効使用を可能にする シート溶着機を提供することを目的とする。 本発明は更に、溶着帯の湾曲又は転向に適応して円滑に方向転換すること ができるシート溶着機を提供することを目的とする。
発明の開示 上記目的を達成するために、本発明は、楔型加熱具及ぴ加圧ローラにより 2 枚のシート材料の縁部を連続的に溶着するとともに、溶着帯の溶着不良検査 のために流体を封入可能なチャンネルを 2列の溶着帯の間に形成するシート 溶着機において、 上下のシート材料（W1 : W2)の縁部（A1 : A2)に伝熱接触して該縁部を加 熱溶融する楔型加熱具（1 5)と、該加熱具の収斂部（19)に近接して配置され た上下一対の加圧ローラ（1 1、 12)と、前記加熱具の中央部において前記収 斂部から前記シート材料の走行方向に突出する圧縮空気吐出管（20)とを備 え、前記吐出管の先端部（25)は、前記加圧ローラのニップ（N)に延入して該 二ップを貫通し、前記シート材料の走行方向前方に向かって圧縮空気（CA) を吐出することを特徴とするシート溶着機を提供する。 上記構成のシート溶着機によれば、シート材料の縁部は、加熱具により溶融 した直後に加圧ローラによって狭圧され、圧着する。圧縮空気吐出管は、吐出 管に接する上下のシート材料を分離するとともに、先端部から吐出する圧縮空 気により、連続する未溶着帯を形成する。未溶着帯は、加圧ローラが形成する 溶着帯（B 1 : B2)を左右に分割する連続チャンネル（C)を構成し、チャンネル 内には、圧縮空気が封入される。シート溶着機によるシート圧着作業の間に溶 着不良が生じた場合、チャンネル内の圧縮空気は、外界に放出され、チャンネ ノレは、空気弾性を喪失するので、溶着不良の発生は、直ちに検出される。 また、上記構成のシート溶着機は、単一列の加圧ローラにより二列の溶着帯 を形成することができるので、シート縁部の重なり幅（接合幅 X)は、単一の加圧 ローラの幅を僅かに超える寸法に低減ないし縮小することができる。更に、単一 列の加圧ローラを備えた上記シート溶着機は、左右のローラの回転差に起因 する方向転換の困難性を解消するので、溶着帯の湾曲又は転向に適応して 円滑に方向転換し得る。 本発明の好適な実施形態によれば、上記加圧ローラとして、金属製の円柱 形ローラが使用される。変形例として、加圧ローラは、耐熱性を有する樹脂、ゴ ム又はエラストマ一製の円柱形ローラからなる。所望により、圧縮空気吐出管に 相応する加圧ローラの領域に周溝（40)を形成しても良レ、。周溝は、吐出管を 挿入したシート材料部分の圧縮力を局所的に解放し、該シート材料部分の弾 性変形による上記チャンネルの形成を容易にする。 好ましくは、圧縮空気吐出管は、円形断面の金属管からなり、吐出管の先端 面は、真円形開口部を形成する。吐出管の先端部を偏平化し且つ幅方向に 拡開し、吐出管先端面を楕円形又は長円形開口部の形態に成形しても良 レ、。 他の観点より、本発明は、楔型加熱具及び加圧ローラにより 2枚のシート材 料の縁部を連続的に溶着し、 2列の溶着帯を形成するともに、流体封入可能 なチャンネルを前記溶着帯の間に形成し、圧縮空気を前記チャンネルに充填 して溶着帯の溶着不良を検査するシート溶着方法において、 楔型加熱具の中心領域に圧縮空気吐出管を配置し、該吐出管から圧縮空 気を吐出しながら、前記加熱具によりシート材料の縁部を加熱溶融し且つ前 記加圧ローラにより前記縁部を狭圧し、 重なり合う前記シート材料の縁部に 2列の連続溶融帯を形成して該縁部を溶 着すると同時に、圧縮空気を充填したチャンネルを前記溶融帯の間に形成し、 前記チャンネル内の空気の漏出を検出することにより、溶着作業中に溶着不 良を検査することを特徴とするシート溶着方法を提供する。
図面の簡単な説明 図 1Aは、本発明の好適な実施形態を示すシート溶着機の全体斜視図であ り、図 1Bは、シート溶着機の溶着機構を示す斜視図である。 図 2Aは、溶着機構の正面図であり、図 2Bは、溶着機構の平面図である。 図 3Aは、図 2Aの I一 I線における断面図であり、図 3Bは、図 2Aの I I一 I I線 における断面図である。 図 4Aは、図 1に示す空気吐出管の先端部の構造を示す斜視図であり、図 4 Bは、空気吐出管の変形例を示す斜視図であり、図 4Cは、溶着機構の加熱口 ーラの変形例を示す正面図である。 図 5A及び図 5 Bは、従来の溶着機構を示す斜視図及び正面図である。 図 6Aは、図 5Bの I I I一 I I I線における断面図であり、図 6 Bは、従来の溶着 機構を用いて溶着したシートの検査方法を示す平面図である。
発明を実施するための最良の形態
図 1乃至図 3には、本発明の好適な実施形態を示すシート溶着機が図示されてい る。 シート溶着機 1は、手指で握持可能な操作ハンドル部 2と、ハンドル部 2に一体的 に連結した本体 3と、本体 3に取付けられた電動モータ 4とを備える。電源コード 5が、 ハンドル部 2の先端部に接続される。本体 3のサイドカバー 6力 本体 3の両側に取 付けられ、溶着機構 10が、サイドカバー 6の内側に配置される。溶着機構は、上下 一対の加圧ローラ 1 1、 12、楔型加熱具 15および圧縮空気吐出管 20を備える。 電源コード 5は、バッテリー、外部電源又は変圧器に接続され、本体 5は、供給電 力を受電する電気回路 30 (図 3)を内蔵する。電気回路 30は、電動モータ 4及び加 熱具 15を手動操作する手動操作スィッチ 7、電動モータ 4の回転数又は変速機構 を制御する速度制御手段、加熱具 15の表面温度を制御する温度制御手段、更に は、圧縮空気吐出管 20の空気吐出量を制御する空気量制御手段を備え、電動モ ータ 4及び加熱具 15の作動を制御する。 サイドカバー 6の内側面には、電動モータ 4の駆動軸の回転を加圧ローラ 1 1、 12 の中心軸 13、 14に伝達する動力伝達機構 9 (図 3)が配設され、電動モータ 4の駆 動トルクは、矢印で示す方向の加圧ローラ 11、 12の回転に変換する。 溶着機構 10を構成する加熱具 15は、図 3に示す如く、加圧ローラ 11、 12のニッ プ部分において収斂する楔形態に成形され、圧縮空気吐出管 20は、加熱具 15の 幅方向中央部を貫通し、収斂部 19から前方に突出する。加熱具 15は、電気発熱 線 16を内蔵し、電気発熱線 16は、電気回路 30に接続される。電気発熱線 16の通 電により、加熱具 15の上面 17及ぴ下面 18が加熱される。 加圧ローラ 11、 12は、収斂部 19に近接して配置され、加熱具 15の中心平面に対 して上下対称に位置決めされる。各加圧ローラ 11、 12の外周面には、ローレット力 S 付けられる。収斂部 19は、加圧ローラ 11、 12の-ップ内に延入し、収斂する。加圧 ローラ 11、 12の-ップ寸法 Nは、シート材料 W1 :W2を適切な厚さに狭圧する寸法 に設定され、圧縮空気吐出管 20は、加熱具 15の中心部を貫通してニップ内に延 入する。吐出管 20の基端部は、圧縮空気給送管 21を介して圧縮機 22に接続され、 吐出管 20の先端部 25は、加圧ローラ 11、 12のニップ間隙を貫通し、二ップの僅か に前方にて終端する。圧縮空気源を構成する圧縮機 22は、本体 3の部分に内蔵し ても、或いは、装置外に配置し、圧縮空気搬送管を介して本体 3内の制御弁に接続 しても良い。 図 4Aには、圧縮空気吐出管 20の先端部 25の形状が例示されている。先端部 25 は、吐出管 20を垂直に切断した円形断面を有し、吐出管 20の圧縮空気を前方に 吐出する。図 4Bに示す如ぐ先端部 25の高さ寸法 Pを低減すベぐ先端部 25を偏 平化し、横長の楕円形又は長円形断面に成形しても良い。 吐出管 20の直径は、 0. 5〜3. 0腿の範囲内の所定直径、例えば、 2匪の直径を 有し、圧縮空気の空気圧は、 1. 5〜3. Okg/cin2 (G) の範囲内の圧力、例えば、 2. Okg/cm2 (G) に設定される。シート材料 W1 :W2は、一般には、 1. 0〜5. 0腿の範 囲内の厚さを有し、通常は、 2. 0〜3. 0腿程度の厚さを有するもの力 比較的多く の施工現場で使用される。加圧ローラ 11、 12のエップ寸法 Nは、 1. 5〜7. 0IM1程 度の寸法に設定され、好ましくは、 3. 0〜5. 0mm程度の寸法に設定される。また、加 圧ローラ 1 1、 1 2の幅は、 10I ！〜 40mm程度の範囲内の寸法、好ましくは、 15mm以下 に設定される。所望により、加圧ローラ 11、 12の幅を 10IM程度に設定することも可 能である。 加圧ローラ 1 1、 12として、金属製円筒体、或いは、耐熱性を有する樹脂、ゴム又 はエラストマ一製の円筒体が使用される。樹脂、ゴム又はエラストマ一製ローラを使 用した場合、空気吐出管 20を配置した部分の膨らみをローラ表面の弾性変形によ り或る程度まで吸収することができるので、有利である。ローラを形成する樹脂、ゴム 又はエラストマ一として、耐熱温度が 300°C以上、好ましくは、 500°C以上の物性を 有するものが採用される。 次に、シート溶着機 1の作動について説明する。 シート溶着機 1は、 2枚のシート材料 A1、A2の接合部にセットされる。上側のシー ト材料 W1は、加熱具 15の上面に沿って加圧ローラ 11、 12のニップ Nに挿入され、 下側のシート材料 W2は、加熱具 15の下面に沿って加圧ローラ 11、 12のニップ Nに 挿入される。ハンドル部 2の手動操作スィッチ を加熱位置に切換えることにより、加 熱具 15の電気発熱線 16に通電し、加熱具 15の上面及び下面をシート材料 W1： W2の溶融温度に加熱することができる。手動操作スィッチ 7をモータ駆動位置に切 換えることにより、電動モータ 4が更に作動する。上下の加圧ローラ 11、 12は、矢印 方向に回転し、ニップ間にシート材料 W1 : W2を引込み、狭圧する。対向する面が 熱溶融したシート材料 W1 : W2は、加圧ローラ 11、 12の圧力下に圧接し、接合する。 シート溶着機 1をシート材料 W1： W2の縁部 A1： A2に沿って一定の速度で移動す ることにより、重なり合うシート材料 W1 : W2の縁部 A1 : A2を連続的に溶着すること ができる。 この溶着作業の間、圧縮空気吐出管 20は、圧縮空気を吐出し続ける。吐出管 20 の先端部 25から吐出した圧縮空気は、熱溶融したシート材料 W1 : W2を局所的に 冷却するとともに、圧縮空気流は、両者の相互接着を阻止する。この結果、吐出管 20の軸線を中心とした所定幅 Yのチャンネル Cが形成されるとともに、 2列の溶着帯 B1 : B2が、チャンネル Cの両側に形成される。 このようなシート溶着機 1によれば、チャンネル Cの先端部 Eを気密処理した状態で 溶着作業を遂行することにより、溶着作業中に生じ得る溶着不良をその場で直ちに 発見することができる。即ち、溶着不良箇所が発生した場合、チャンネル Cの空気圧 が急激に低下し、チャンネル C部分のシート材料 W1 : W2は、即座に空気弾性又は 反発力を喪失するので、溶着作業者は、溶着作業を中断し、溶着不良箇所を即座 に補修すれば良い。 また、上記構成のシート溶着機 1では、単一のローラ 11、 12の幅を僅かに超えるシ ート材料 Wl : W2の接合幅 X (重ね代）を確保すれば良いので、シート材料 Wl : W2 の接合幅を低減し、シート材料を有効に使用することができる。 更に、上記構成のシート溶着機 1は、上側及び下側の単列ローラ 11、 12により溶 着作業を遂行するので、接合部が湾曲し又は転向する場合に、円滑に方向転換す ること力 Sできる。このため、接合部の湾曲又は転向に適応した連続溶着作業を比較 的容易に実施すること力 Sできる。 図 4Cは、溶着機構 10の変形例を示す正面図である。 本例の加圧ローラ 11、 12は、幅方向中央部において局所的に縮径しており、カロ 圧ローラ 11、 12の全周に亘つて延びる弧状断面の周溝 40が、圧縮空気吐出管 20 に相応する位置に形成される。上下の周溝 40は、シート材料 W1 : W2の弾性変形 を可能にし、吐出管 20によるチャンネル Cの形成を容易にする。なお、周溝 40を凹 形（角形）断面形状に成形しても良い。 以上、本発明の好適な実施形態について詳細に説明したが、本発明は上記実施 形態に限定されるものではな 特許請求の範囲に記載された本発明の範囲内で 種々の変形又は変更が可能であり、該変形例又は変更例も又、本発明の範囲内に 含まれるものであることは、レ、うまでもない。 例えば、圧縮空気吐出管は、必ずしも加熱具の幅方向中心線上に位置決めする 必要はなぐ加熱具の幅方向中心から左右に若干ずれた位置に吐出管を位置決 めしても良レ、。 また、収斂部からの圧縮空気吐出管の突出寸法、或いは、突出管先端部の位置 を可変制御し又は調節すベぐ吐出管の支持構造を適宜設計変更しても良く、例 えば、吐出管を相対変位可能に加熱具に支持するように加熱具及び吐出管の構 造を設計することができる。 産業上の利用可能性
本発明の上記構成によれば、溶着作業の進行中に溶着不良検查を実施すること ができるシート溶着機が提供される。本発明のシート溶着機は、シートの接合幅を減 少し、シート材料の有効使用を可能にするとともに、溶着帯の湾曲又は転向に適応 した溶着機の円滑な方向転換を可能にする。

Claims

請 求 の 範 囲
1. 楔型加熱具及び加圧ローラにより 2枚のシート材料の縁部を連続的に溶着 するとともに、溶着帯の溶着不良検査のための流体を封入可能なチャンネルを 2列の溶着帯の間に形成するシート溶着機において、 上下のシート材料の縁部に伝熱接触して該縁部を加熱溶融する楔型加熱 具と、該加熱具の収斂部に近接して配置された上下一対の加圧ローラと、前 記加熱具の中央部において前記収斂部から前記シート材料の走行方向に突 出する圧縮空気吐出管とを備え、前記吐出管の先端部は、前記加圧ローラの エップに延入して該ニップを貫通し、前記シート材料の走行方向前方に向かつ て圧縮空気を吐出することを特徴とするシート溶着機。
2. 前記加圧ローラは、ローレットを付した金属製円筒体からなることを特徴とす る請求項 1に記載のシート溶着機。
3. 前記加圧ローラは、耐熱性を有する樹脂、ゴム又はエラストマ一製の円筒体 力らなることを特徴とする請求項 1に記載のシート溶着機。
4. 前記吐出管に相応する前記加圧ローラの中央領域には、該加圧ローラの 全周に亘つて延びる周溝が形成されることを特徴とする請求項 1乃至 3のいず れか 1項に記載のシート溶着機。
5. 前記吐出管は、円形断面の金属管からなり、該吐出管の先端面は、真円 形開口部を形成することを特徴とする請求項 1乃至 4のいずれか 1項に記載の シート溶着機。
6. 前記吐出管の先端部は偏平化し且つ幅方向に拡開し、吐出管先端面は、 楕円形又は長円形開口部を形成することを特徴とする請求項 1乃至 4のいず れか 1項に記載のシート溶着機。
7. 楔型加熱具及ぴ加圧ローラにより 2枚のシート材料の縁部を連続的に溶着 し、 2列の溶着帯を形成するともに、流体封入可能なチャンネルを前記溶着帯 の間に形成し、圧縮空気を前記チャンネルに充填して溶着帯の溶着不良を検 查するシート溶着方法において、 楔型加熱具の中心領域に圧縮空気吐出管を配置し、該吐出管から圧縮空 気を吐出しながら、前記加熱具によりシート材料の縁部を加熱溶融し且つ前 記加圧ローラにより前記縁部を狭圧し、 重なり合う前記シート材料の縁部に 2列の連続溶融帯を形成して該縁部を 溶着すると同時に、圧縮空気を充填したチャンネルを前記溶融帯の間に形成 し、前記縁部からの空気の漏出を検出することにより、溶着作業中に溶着不良 を検査することを特徴とするシート溶着方法。
8. 前記溶着帯の溶着不良が検出されたときに、シート溶着作業を中断して溶 着不良箇所を補修するとともに、補修後に前記溶着作業を続行することを特 徴とする請求項 7に記載のシート溶着方法。
9. 前記加圧ローラの幅を 15 1以下に設定し、 2列の溶着帯の全幅（X)を 1 51 1以 下に設定することを特徴とする請求項 7又は 8に記載のシート溶着方法。
PCT/JP2001/000572 2001-01-29 2001-01-29 Soudeuse de feuilles WO2002060675A1 (fr)

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