JP2000127249A - Hot air welding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for continuous hot air welding at least one stripe of a strip-like sheet to an intermediate position of a wide base material sheet. SOLUTION: The hot air welding apparatus continuously welds with hot air at least one stripe of a stripe-like sheet B to an intermediate position of a wide base material sheet A. In this case, the apparatus comprises a long shaft backup roll 2 for supporting the sheet A from below, a short shaft roll 3 suspended from at least one frame 6 for pressing the sheet B from above, a guide 7 for guiding and positioning the sheet B to a predetermined position of the sheet A and a hot air supply nozzle 9 for supplying hot air between the sheet A and the sheet B. Thus, the feeding sheets A and B are heated by the hot air, and sandwiched between the rolls 2 and 3, and thermally welded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for continuously hot-air welding at least one strip-shaped sheet at an intermediate position of a wide base sheet.

[0002]

2. Description of the Related Art Conventionally, sheets used for garage covering sheets, simple warehouse covering sheets, building construction mesh sheets, covers, and the like are formed by folding a sheet and forming a connection hole in a peripheral portion of the sheet. For example, an eyelet or the like is provided, and the eyelet is used by being tied and fixed to a skeleton member such as a pipe through a cord body or the like.
However, when the area of the sheet is small, it can be firmly fixed to the skeletal member just by being connected by the connection hole provided in the peripheral portion of the sheet, but when the area of the sheet becomes large, the sheet is peeled off from the skeletal member by wind pressure, or The increased weight makes it impossible to support it, making it difficult to install it safely and stably. Therefore, a connecting hole is provided, for example, a flap of a band-like body having an eyelet or the like is joined to a desired position of the sheet, and the connection between the connecting hole and the skeletal member is strengthened and used.

FIG. 10 shows a sheet a used for a garage covering sheet or the like. The sheet a is extended not only to the roof part c of the garage frame member b but also to the side part d to provide a shielding effect. The aesthetic appearance has been improved. In this case, the sheet a is not only the ridge line e on the roof top but also the sheet a
And a skeletal member b are desirably connected, and a flap provided with a connection hole is provided at a position corresponding to a contact point between the skeletal member of the ridgeline on the roof top on the back surface of the seat and the skeletal member of the side girder. The sheet is rigidly connected to the skeletal member by, for example, connecting the connection holes and the skeletal member with a string by attaching them in a dotted or continuous manner. FIG. 11 shows a sheet a used for a cover sheet for a simple warehouse and the like, and also in this case, the rear surface position of the sheet abutting on the frame member in the longitudinal direction of the simple warehouse so as to correspond to the shape of the simple warehouse. 12, a flap h which is formed in advance and has a connection hole g as shown in FIG.
The sheet is connected to the skeletal member as an outer layer covering material by using the connection holes of the above and the connection holes on the side. Such a sheet is suitably used for a cover sheet for a simple warehouse, a cover sheet for a livestock barn, and the like. As these covering sheets, FIG.
As shown in FIG. 13, a sheet a with a predetermined number of flaps h attached at a predetermined position in the center of the sheet a is preferably used, and the flap h is attached to the sheet a as shown in FIG. The side is attached in a prone state so as not to hinder the whole sheet from being wound up.

FIG. 14 shows an example of a mesh sheet used for construction work. As shown in FIG. 14 (a), a sheet a serving as a mesh sheet for building work is usually 1.8 m wide and 5.1 m long connected to a steel frame member j such as a pipe rack using a connecting string i. However, in this case, it takes time to adjust the positions of the sheets a and to perform the connecting operation for each of the sheets a to be connected, and a gap is generated between the connected sheets a, so that the safety is reduced accordingly. Then, as shown in FIG. 14 (b), when a flap h provided with a connection hole g is provided at the center of a sheet a 3.6 m in width and 5.1 m in length having a size of two conventional sheets connected, The workability is improved by reducing the number of sheets a to be attached, and the gap between the sheets is reduced to improve the safety. Therefore, the sheet a is more suitably used as a mesh sheet for construction work.

FIG. 15 shows a sheet a configured as a hay (hay) cover, which is used as a cover for waterproofing and preventing scattering of the stacked block-shaped hay k. For this reason, when the sheet is strongly pulled in the horizontal direction, stress concentrates on the edge processed portion of the sheet, so that the sheet is apt to be damaged. If a high-strength sheet is used to prevent damage, the cost increases. Therefore, as shown in the drawing, if a pecket m for a tension stopper is attached to one surface of the sheet a, the tensile stress is dispersed between the edge-processed portion and the pecket, thereby preventing breakage of the sheet. Cost sheets can be used effectively.

On the other hand, hay is harvested as livestock feed on a large-scale dairy farm, and is stored outdoors for a few months as a huge stack of block-shaped hay. . Such a hay needs a cover for waterproofing against rainwater and the like and preventing scattering by wind. As an aggregate of hay, for example, it has a huge shape such as 15 × 60 m in length and width and 5 m in height. In addition, raw cotton collected from a cotton field is often stored as a cotton module compressed and formed into a predetermined shape for two weeks to six months before being sent to a cotton mill. The cotton module still contains the seeds of the raw cotton, so that the cotton module needs to be waterproofed in order to germinate due to moisture such as rainwater to reduce the quality of the raw cotton, and also to take measures to prevent scattering. The cotton module is usually a rectangular parallelepiped of about several to 10 tons suitable for being directly transported to a truck container, and has a shape such as 2.5 m in length × 10 m and 2.3 m in height.

In such a method of coating a stack of hay and cotton modules, as shown in FIGS. 16 and 17, first, a cloth sheet made of a waterproof synthetic resin is used as a coating sheet a. This is connected by the required length to cover the hay stack n and the cotton module stack o, and tighten the surface and the periphery of the sheet a with a rope p so that the coated sheet a is not blown off by the wind. However, after the rope is hanged on a huge aggregate covered with the sheet and the rope is positioned, the tightening work is poor workability, and if the sheet and the rope are not connected, As time elapses, there is a problem that the seat and the rope come off and the tightened state is loosened. In addition, when the use of the sheet that covers the hay aggregate is finished, if the used rope etc. comes off the sheet and mixes with the hay, there is a problem that livestock that took hay as feed will die. In addition, there is also a problem that if mixed with the raw cotton, the raw cotton becomes contaminated and the quality of the raw cotton is significantly reduced. As means for solving such a problem, as shown in FIG. 18, a tube body r obtained by folding a flap in two to form a sleeve q on one side of a sheet a is attached (a), or a band-like body is provided. s is attached so that both sides of s are joined to form a sleeve q with a sufficient inner space (b), or attached so that both sides of the band s are joined to form a sleeve q having a narrow inner space. Then, a tightening member-containing sheet in which a tightening member t such as a rope is included in the sleeve is preferably used.

As described above, it is necessary to attach a band-shaped sheet at an intermediate position of the sheet in order to attach a flap or a pecket as a connecting member for connecting the sheet to the frame member, or to form a sleeve for enclosing the rope. And various methods have been used so far.

The most frequently used method is sewing by perforation. However, sewn products are inferior in waterproofness and the sheet is damaged by the sewing needle, resulting in a decrease in strength. The sewing work is low in productivity, and the sewn work is finished in a straight line by manual sewing. However, there are problems such as difficulty in appearance and poor appearance, and further, the sewing thread is frayed and the flap comes off, and the durability of the sewing thread is inferior to that of the sheet.

In order to solve the disadvantages of sewing, a welding method is attempted, and a welding operation for welding a flap h to the center of a sheet a is performed by a method as shown in FIG. In this method, a sheet a cut to a predetermined size is arranged on a floor provided with a welding table u also serving as a cooling table of a predetermined length, a flap h is overlapped at a predetermined position, and the flap h is placed on the flap h. The welding is performed using a handy type hot air type or hot plate type welding machine v or the like. In this work, first of all, the floor area for spreading and working a sheet of a predetermined size is indispensable, and it is not easy to manually spread the sheet to a predetermined position and stretch and spread it, and furthermore, it is not easy. There is also a problem that the work of accurately aligning the flap with a predetermined position to be welded requires a lot of trouble. Furthermore, when the sheet and the flap thus overlapped are welded,
There is also a problem that the tension between the sheet and the flap does not match at the time of welding, or the thermal shrinkage of the sheet and the flap is different, so that the sheet and the flap are displaced at the end portion at the time of welding. In order to solve the problem, an industrial production method capable of continuously welding a sheet and a flap has been desired.

As a method of welding the flap to the surface of the sheet, a hot air welding method in which only the surface of the sheet is thermally welded so as not to cause thermal deterioration inside the sheet is preferable. As a method of welding sheets by hot air welding, there is a hot air welding machine w as shown in FIG. The hot-air welding machine w must be provided with a pair of upper and lower rolls x, a hot-air supply nozzle y, and a sheet guide z for guiding the sheet. In this manner, when welding the ends of the sheet, A sheet guide that guides the sheets from both sides in an overlapping manner acts as a column, so that the upper holding roll and the hot air supply nozzle can be provided vertically.

However, if hot air welding is to be performed at the center of the wide sheet in the width direction, the above-described conventional hot air welding machine cannot have the holding roll and the hot air supply nozzle. There has not yet been found an industrial production method which is excellent in productivity and can produce a long product in which a belt-shaped sheet or the like is welded by hot air.

[0013]

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide an apparatus for continuously hot-air welding at least one strip-shaped sheet at an intermediate position of a wide base sheet.

[0014]

SUMMARY OF THE INVENTION The present invention, as a technical means for solving the above-mentioned problem, is an apparatus for continuously hot-air welding at least one strip-shaped sheet at an intermediate position of a wide base sheet. A long-axis receiving roll for supporting the base material sheet from below, a short-axis pressing roll suspended from at least one frame for pressing the band-shaped body sheet from above, and a belt-shaped support roll at a predetermined position of the base material sheet. A guide that guides the body sheet for positioning, and a hot air supply nozzle that supplies hot air between the base sheet and the band-shaped sheet, wherein the traveling base sheet and the band-shaped sheet are heated and received by the hot air. An object of the present invention is to provide a hot-air welding device characterized in that the hot-air welding device is sandwiched by a roll and a holding roll and is thermally welded.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram illustrating a configuration of a hot-air welding device 1 of the present invention.

In FIG. 1 showing the hot-air welding apparatus 1, reference numeral 2 denotes a receiving roll which supports a traveling base sheet A from below in the width direction thereof, and the width of the traveling wide base sheet A. Longer roll than longer roll. Reference numeral 3 denotes a pressing roll, which presses the running belt-shaped body sheet B from above. The pressing roll 3 is composed of a rotating roll member 4 and a cylinder 5 for moving the roll member 4 up and down. The cylinder 5 is suspended from a frame 6 that is arranged to extend in the width direction of the base sheet A. ing. 7
Is a guide for guiding and positioning the band-shaped sheet B at a predetermined position of the base sheet A, and for guiding the band-shaped sheet B from both ends in the width direction of the band-shaped sheet B for positioning. However, if guidance is possible from only one end, only one end may be used. This guide 7
Is attached to a frame 8 extending in the width direction of the base material sheet A, and is located on the upstream side in the feed direction of the base material sheet from the position of the holding roll 3 to which the belt-shaped body sheet B is welded by hot air. Reference numeral 9 denotes a hot air supply nozzle for heating the welding surfaces of the sheets A and B by inserting the nozzle tip between the base sheet A and the belt-shaped sheet B.

The receiving roll 2 is a roll having a long axis longer than the width of the base sheet A as described above, and is supported and attached to an auxiliary roll (not shown) in order to prevent the receiving roll 2 from bending due to weight. In the present invention, the base sheet A
Is processed in the range of about 3 to 12 m in width, usually 5 to 10 m.
m. As described above, since the hot-air welding apparatus 1 includes the receiving roll 2 having a long axis longer than the width of the base sheet A in the width direction of the base sheet A, the belt-shaped sheet B is provided at an arbitrary position where the pressing roll 3 described later is provided. Hot air welding is possible.

Any number of the holding rolls 3 can be suspended at an arbitrary position in the width direction of the frame 6 arranged so as to be bridged in the width direction of the base sheet A. Therefore, an arbitrary number of band-shaped sheets B are provided at positions in the width direction of the base sheet A so as to be capable of being thermally welded. Since a predetermined width is required to suspend the holding roll 3, as shown in FIG.
In the feed direction, and the necessary pressing rolls 3 can be installed in the width direction. In this case, the receiving rolls 2 need to be provided in multiple stages.

The guide 7 comprises an arm 10 attached to the frame 8 and a guide member for guiding the belt-shaped sheet A by sliding it between the ends of the arm 10 between the arm 10 and positioning the sheet A in the width direction with respect to the base sheet A. 11 and is located upstream of the holding roll 3 in the feeding direction. When the pressing rolls 3 are provided in multiple stages as described above, the guide 7 is provided on the frame 8 provided in multiple stages upstream.
To be mounted on. A considerable number of guides 7 are provided so as to support one end of the band-shaped sheet B in a slidable manner or to support both ends in a slidable manner in accordance with the number of band-shaped sheets B to be welded by hot air.

The hot air supply nozzle 9 is provided between the base material sheet A and the band-shaped body sheet B and has a nozzle member 12 having a blowout hole for blowing hot air, and the nozzle member 12 is joined to the nozzle member 12 to form a frame. A driving means 13 capable of moving back and forth in the width direction of the frame 8;
Attached to. Although not shown, the hot air is supplied from a hot air supply device to the nozzle member by a flexible pipe. When the press roll 3 is provided in multiple stages, the hot air supply nozzle 9 may be attached to the frames 6 and 8 provided in multiple stages as needed. Hot air supply nozzle 9
Is provided with a number corresponding to the number of hot-air welding locations.

FIG. 3 is a schematic front view of the hot-air welding apparatus 1 in which the guide and the hot-air supply nozzle of the base material sheet are omitted, and the five sets of the holding roll 3 and the receiving roll 2 are installed. By arranging a plurality of pressing rolls 3 in the width direction, the band-shaped sheet is attached, and the pressing edge processing of the side edge of the base sheet A by hot air welding is performed on the pressing side. Can be performed. Of course, it is possible to provide a hot air supply nozzle for the folded edge processing. FIG.
Is schematically shown, and is illustrated as a form in which five series of pressing rolls 3 are arranged in one frame, but as described above, the frames are arranged in multiple stages,
The holding roll 3 can be attached to each. As shown in FIG. 4, three strip-shaped sheets B are provided at intermediate positions of the base sheet A by using the hot-air welding apparatus 1.
Can be produced by hot-air welding, and the base sheet A is folded at both ends to produce a hot flap-welded edge flap welded sheet. This flap C may be, for example, one provided with connecting holes g at predetermined intervals at one longitudinal end of a band-shaped body sheet B as shown in FIG. 11, or a cross section shown in FIG. As shown, a flap in which the edge of the belt-shaped body sheet B is subjected to edge processing with the reinforcing rope D inward and the eyelet E is cast at the edge processed portion.

FIG. 5 shows a hot-air welding apparatus 1 in which one presser roll 3 is further provided in the apparatus shown in FIG. 3 to increase the number of welding sections by one series.
6m) and the narrow sheet A2 (for example, 1.8m) to form a wider base sheet A (for example, 5.4m). An example in which the edge processing portion is applied is shown.

FIG. 6 shows another embodiment. In this embodiment, both ends B of a band-shaped body sheet B are
1, B2 is welded with hot air to form a sleeve q, and at the same time as the formation of the sleeve q, a flexible tightening member enclosing sheet including a flexible tightening member t having a flat cross-sectional shape is included in the sleeve q. To form. In order to weld both ends B1, B2 of the band-shaped body sheet B with hot air, both ends B1, B
A press roll 3 and a hot-air supply nozzle 9 are provided at each of the positions corresponding to 2, whereby a sheet having a configuration in which a single sleeve q is formed and a flexible tightening member t is inserted into the sleeve q is obtained. That's what we do.

FIG. 7 is a schematic front view of the hot-air welding apparatus 1 for forming the flexible tightening member-enclosing sheet. Two holding rolls 3 are provided, and one holding roll 3 is provided at each position corresponding to both ends of the base sheet A, so that the flexible tightening member can be included simultaneously with the edge processing. In this way, as shown in FIG. 8, it is possible to obtain a long flexible tightening member enclosing sheet provided with a sleeve q enclosing two flexible tightening members t at both ends. The flexible tightening member enclosing sheet can be cut into a predetermined length to produce a cotton cover as shown in FIG.

FIG. 9 schematically shows a process of manufacturing a long sheet which can be used as the above-described cover by disposing the hot-air welding apparatus 1 having the above-described structure, and particularly manufacturing a sheet including a flexible tightening member. The process is illustrated. On the upstream side in the flow direction of the process, there is a base sheet supply roll F, a wide base sheet A is sent out, and a tightening member supply roll G and a band-shaped body sheet supply roll H are provided.
A tightening member (for example, a rope or a tape) J and a band-shaped body sheet B are sent out in the same direction as the base sheet A. Then, the base sheet A, the tightening member J, and the belt-shaped body sheet B are made to reach the hot-air welding apparatus 1 in a state where a predetermined tensile force along the feed direction is continuously applied. First, the hot-air welding apparatus 1 includes a guide step of positioning the band-shaped body sheet B at a predetermined position so as to cover the tightening member J with the guide 7 supported by the frame 8. A correspondingly positioned strip of sheet is fed out. Then, hot air is blown by a hot air supply nozzle 9 supported by the frame 6, and the tightening member is covered by being sandwiched between the receiving roll 2 and the holding roll 3 which are driven and rotated. There is a welding step of welding. Then, there is a discharge step in which the sheet is fed while being sandwiched between the driving roll K and the pulling roll M that are driven and rotated, and a continuous sheet containing the flexible tightening member is obtained. From the base sheet, the tightening member, and the belt-shaped body sheet which are respectively long and continuously fed as described above, the long flexible tightening member enclosing sheet N is continuously formed, and the sheet N is formed. After passing through the dancer roll O, an eyelet is formed by an eyelet punching machine P that provides eyelets on the edge of the sheet N (when eyelets are provided in the edge processing, processing is performed by the eyelet punching machine), and a required length in the feeding direction with a cutter Q The sheet N cut by the folding device R is discharged while being folded by the folding device R.

The base sheet used in the hot-air welding apparatus of the present invention may be a synthetic resin sheet, a woven or woven fabric made of synthetic fibers or a nonwoven fabric, or a woven or woven fabric made of synthetic fibers or a laminated sheet of a nonwoven fabric. Any sheet that can be used can be used. Specific examples of the synthetic resin sheet include a single-layer sheet such as a polyethylene sheet, a polypropylene sheet, a polyvinyl chloride sheet, a polyethylene foam sheet, and a polyurethane foam sheet.

Specific examples of the woven or knitted fabric or nonwoven fabric made of synthetic resin or the like are woven or knitted fabrics obtained by using filament yarns made of polyolefin, polyester, nylon, or the like. It also includes sheets. Monofilament, multifilament, flat yarn,
Any of split yarns and the like can be employed, and the filament yarn may be a core-sheath type or parallel type composite filament yarn composed of a high melting point component and a low melting point component. The nonwoven fabric is formed by a spunbond method, a melt blown method, a flash spinning method, or the like using polyolefin, polyester, nylon, or the like.

Specifically, a laminate sheet of a woven or knitted fabric or a nonwoven fabric made of a synthetic resin or the like is a laminate in which a laminate layer is provided on at least one surface of the above woven or knitted fabric or a nonwoven fabric. Specifically, low-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acrylic copolymer, propylene-ethylene random copolymer, and the like are preferably used.

Of the above various sheets, specific examples of the base sheet include a polyethylene flat yarn cloth laminate sheet, a polypropylene multifilament cloth laminate sheet, a polyethylene monofilament mesh sheet, a polypropylene monofilament mesh sheet, and a polyethylene multifilament cloth polyvinyl chloride. A coating sheet, a polyvinyl chloride sheet and the like are preferably used.

The strip-shaped sheet used in the hot-air welding apparatus of the present invention is obtained by cutting the heat-sealable sheet into a predetermined size and continuously welding in the longitudinal direction of the base sheet. It is a long belt-shaped body continuous with When the band-shaped sheet is used as a member for attaching the base sheet to the skeleton member of the base sheet, a connection hole g is provided in the band-shaped sheet B as shown in FIG. 12, or eyelets are formed at predetermined intervals as shown in FIG. E and the like are used, and one end of the band-shaped body sheet is hot-air welded as a flap having a cut surface subjected to a fraying prevention treatment as necessary. Further, when a sleeve is provided on the base material sheet to form the flexible tightening member enclosing sheet, both ends of the belt-like body sheet are welded with hot air to form a sleeve and the flexible tightening member can be included. A flexible tightening member inclusion sheet is created. The material of the band-shaped body sheet is preferably made of the same type and similar material as the base material sheet from the viewpoint of improving the adhesiveness.

[0031]

As described above, the hot-air welding apparatus of the present invention is an apparatus capable of manufacturing a long sheet in which at least one strip sheet is welded at an intermediate position of a wide base sheet. Thus, the long product can be obtained with excellent productivity and at low cost. Then, the obtained long product is cut into a predetermined size according to the purpose of use, and a flap welding sheet or a sheet including a flexible tightening member can be prepared. The flap welding sheet is suitably used for a garage covering sheet, a simple warehouse covering sheet, a building construction mesh sheet, a cover, and the like, and a flexible tightening member containing sheet is suitably used for a hay cover, a cotton cover, a livestock barn cover, and the like. It is used, but the application is not limited to these.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing an embodiment of a hot-air welding device according to the present invention.

FIG. 2 is a view showing an embodiment of a hot-air welding apparatus according to the present invention, and is an explanatory view showing a state in which a holding roll and hot-air supply nozzles are provided in multiple stages.

FIG. 3 is a schematic front view of the hot-air welding device of the present invention.

FIG. 4 is an explanatory view showing folding of a long product in which three flaps are welded at intermediate positions of a base sheet formed by the hot-air welding apparatus of the present invention, and both ends of the flap are edged.

FIG. 5 is an explanatory view in which a press roll is provided in the apparatus of FIG. 1 for joining a base sheet.

FIG. 6 is an explanatory view schematically showing a state in which a flexible tightening member enclosing sheet is formed using the hot air welding device of the present invention.

FIG. 7 is a schematic front view of the hot-air welding device of FIG. 6;

FIG. 8 is a view showing a state in which both ends of the base sheet formed by the hot-air welding apparatus of FIG. It is explanatory drawing which shows the folding of the long product of the sheet | seat containing a flexible tightening member which contained the flexible tightening member in the sleeve.

FIG. 9 is an explanatory view showing a sheet manufacturing process using the hot-air welding apparatus of the present invention.

FIG. 10 is an explanatory diagram showing a use state of a sheet as a garage covering sheet.

FIG. 11 is an explanatory view of a sheet in which a flap for attaching to a skeletal member is attached three-way at an intermediate position of a base sheet.

FIG. 12 is an explanatory view of a flap in which a connection hole is provided at an end of a band-shaped body sheet.

FIG. 13 is an explanatory view showing a cross-section of a flap in which an edge of a belt-shaped body sheet is subjected to edge processing including a reinforcing rope and eyelets are driven into the edge processed portion.

14A and 14B show an example of use of a sheet as a mesh sheet for building work. FIG. 14A is an explanatory view of a conventional sheet and a connecting method, and FIG. 14B is an explanatory view of a sheet to which flaps are welded. .

FIG. 15 is an explanatory view showing a use state in which a pecket is provided on a hay cover.

FIG. 16 is an explanatory view of an example in which a sheet containing a flexible tightening member is used as a hay cover.

FIG. 17 is an explanatory view of an example in which the flexible tightening member enclosing sheet of the present invention is used as a cotton cover.

FIG. 18 shows a state in which a flexible tightening member is included in a sleeve provided on a base sheet, and (a) shows a sleeve formed by folding a band-shaped flap into two and forming a cylindrical shape on the base sheet; Explanatory drawing showing a state in which the flexible tightening member is welded and attached, (b) shows a state in which two portions of the belt-like body are welded to the base sheet to form a sleeve, and the flexible tightening member is provided inside the sleeve. FIG. 3C is an explanatory view showing a state in which a gap is provided so that the belt can be easily slid. FIG. It is explanatory drawing which shows the state provided so that a sleeve might be stuck to a flexible tightening member so that sliding might become difficult.

FIG. 19 is an explanatory view of a batch type welding method using a handy type hot air welding machine.

FIG. 20 shows a conventional sheet end hot air welding machine.
(A) is an explanatory view showing a state viewed from the front, and (B) is an explanatory view showing a state viewed from the side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Hot-air welding apparatus 2 ... Receiving roll 3 ... Holding roll 4 ... Lobe member 5 ... Cylinder 6, 8 ... Frame 7 ... Guide 9 ... Hot-air supply nozzle A ... Base sheet B ... Band-shaped sheet C ... Flap

Claims (1)

[Claims] 1. A device for continuously hot-air welding at least one strip-shaped sheet at an intermediate position of a wide base sheet, comprising a long-axis receiving roll for supporting the base sheet from below, and a strip-shaped sheet. A pressing roller having a short axis vertically suspended from at least one frame for pressing the base sheet from above, a guide for guiding and positioning the band-shaped sheet at a predetermined position of the base sheet, and a base sheet and a band-shaped sheet. A hot air supply nozzle for supplying hot air therebetween, wherein the traveling base sheet and the strip-shaped body sheet are heated by the hot air, sandwiched between the receiving roll and the holding roll, and hot-welded. apparatus.