JP6201566B2 - Welding apparatus and welding method - Google Patents

Description

  The present invention relates to a welding apparatus and a welding method in which peripheral portions of two sheets are welded to form a bag-like sheet.

  In the packaging of food, electronic parts, etc., it is necessary to weld a bag-like sheet by welding at high speed.

  For example, JP 2012-227125 A proposes a sheet manufacturing apparatus. In this manufacturing apparatus, the outer peripheral surfaces are arranged to face each other, the sheet 1 is held on the outer peripheral surface, and rotated to convey the pair of mounting drums, and the tangential direction of mounting toward the pair of mounting drums. A sheet conveying section that conveys the sheet 2 having a predetermined shape; and a joining section that joins the sheets 1 with the sheet 2 sandwiched between the pair of sheets 1 conveyed by the pair of mounting drums. . Then, the pair of sheets 1 are simultaneously delivered and mounted on both surfaces of the sheet 2 being conveyed by the sheet conveying unit from the rotating mounting drum, and the pair of sheets 1 delivered to both surfaces of the sheet 2 are communicated with each other. The sheet 2 is packaged by the sheet 1 by joining the two by the joining portion.

  On the other hand, as a method not using such a mounting drum, a fixed side unit that sucks and holds the first sheet, a movable side unit that sucks and holds the second sheet and moves up and down relative to the fixed side unit, When the movable side unit is lowered toward the fixed side unit and the first sheet and the second sheet are overlapped with each other, the peripheral part of the first sheet and the second sheet is contacted and welded. A superposition method including a heater unit is also conceivable.

JP 2012-227125 A

  However, in the above-described overlapping method, after the first sheet and the second sheet are overlapped to form a bag-shaped sheet, a negative pressure is applied to the bag-shaped sheet when the movable unit is separated from the fixed unit. Thus, there is a problem that the bag-like sheet is displaced.

  Therefore, a main object of the present invention is to provide a welding apparatus and a welding method in which the welding time is shortened and the bag-like sheet is not displaced after the bag-like sheet is formed.

  In order to solve the above-mentioned problem, the invention relating to a welding apparatus for manufacturing a bag-like sheet by stacking a first sheet and a second sheet that can be welded by heating and welding a predetermined peripheral edge portion holds the second sheet by suction. A fixed-side unit having a fixed-side suction portion, a movable-side suction portion that sucks and holds the first sheet, a movable-side suction portion that is held via a spring, and the suction surface of the movable-side suction portion is fixed to the fixed side. The drive unit that is brought into contact with or separated from the adsorption surface of the part and the movable side adsorption unit are arranged around the holding unit, and the heating surface is held by the drive unit so that the heating surface is higher than the adsorption surface of the movable side adsorption unit. The movable side unit composed of a heater unit and a control unit that controls at least the operation of the drive unit, the adsorption operation of the fixed side adsorption unit, and the adsorption operation of the movable side adsorption unit. On the fixed suction part Is contact, further heater unit by compressing the spring, characterized in that it is arranged to be abutted against the fixed side attracting surface.

  Also, the invention relating to the welding method for manufacturing the bag-like sheet by superposing the first sheet and the second sheet that can be welded by heating and welding the predetermined peripheral edge part, the second sheet is adsorbed and held on the fixed-side adsorbing part. A procedure for causing the first sheet to be sucked and held on the movable side suction portion, and a procedure for moving the fixed side suction portion or the movable side suction portion so that the sucked first sheet and the second sheet face each other. And a step of lowering the drive unit that holds the movable side suction part via the spring so that the movable side suction part comes into contact with the fixed side suction part via the first sheet and the second sheet, and The drive unit is lowered to compress the spring between the drive unit and the movable suction unit, and the heater unit held by the drive unit and disposed around the movable suction unit is applied to a predetermined peripheral edge of the first sheet. Touch and heat to melt first sheet and second sheet A procedure for creating a bag-like sheet, a procedure for separating the heater unit by raising the drive unit so that only the heater unit is separated from the bag-like sheet, a procedure for turning off the suction of the movable side adsorption unit, and a heater for the drive unit The movable side suction part separation procedure for releasing the compression of the spring by further increasing the speed slower than the driving speed in the unit separation procedure, and separating the movable side suction part from the bag-like sheet by a preset distance, and the movable side suction And a retracting procedure for separating the relative position between the movable portion and the fixed side suction portion at a speed faster than the separation speed in the movable side suction portion separation procedure.

  According to the present invention, since the speed is controlled when the movable unit is raised, the manufactured bag-like sheet is prevented from being displaced due to negative pressure.

It is a block diagram of the welding apparatus which concerns on 1st Embodiment. It is a figure explaining the generation | occurrence | production situation of a negative pressure, (a) is a figure when a movable side adsorption part is raised vertically, (b) is a figure when a movable side adsorption part is raised vertically. It is a flowchart which shows the manufacture procedure of a bag-shaped sheet. It is explanatory drawing when leaving a bag-like sheet | seat in a fixed side adsorption | suction part, and raising a movable side unit vertically. It is explanatory drawing when a movable side unit is raised diagonally leaving a bag-shaped sheet | seat in a stationary-side adsorption | suction part. It is explanatory drawing when a movable side unit is raised vertically leaving a bag-shaped sheet in a movable side adsorption | suction part. It is explanatory drawing when leaving a bag-shaped sheet in a movable side adsorption | suction part, and raising a movable side unit diagonally. It is a block diagram of the welding apparatus which concerns on 2nd Embodiment. It is explanatory drawing when leaving a bag-like sheet | seat in a fixed side adsorption | suction part, and raising a movable side unit vertically. It is explanatory drawing when a movable side unit is raised vertically leaving a bag-shaped sheet in a movable side adsorption | suction part.

<First Embodiment>
A first embodiment of the present invention will be described. FIG. 1 is a configuration diagram of a welding apparatus 2A according to the present invention. This welding apparatus 2A has a movable side unit 3, a fixed side unit 4, and a control unit 5 as main components, and welds the peripheral portions of the first sheet Sa and the second sheet Sb to produce a bag-like sheet. The first sheet Sa and the second sheet Sb may be made of the same material as long as they can be heat-welded.

  The fixed unit 4 includes a fixed suction part 41 that holds the second sheet Sb by suction.

  Further, the movable side unit 3 can convey the movable side adsorption unit 31 that adsorbs and holds the first sheet Sa, the heater unit 32 installed around the movable side adsorption unit 31, the movable side adsorption unit 31, and the heater unit 32. A drive unit 33 is included.

  The drive unit 33 and the movable side adsorption unit 31 are connected by an adsorption side spring 34, and the drive unit 33 and the heater unit 32 are connected by a heater side spring 35. At this time, in a normal state (at the time of non-welding), at least the working surface (heating region) 32a of the heater unit 32 is located above the suction surface 31a of the movable suction unit 31 (upper side in FIG. 1). Accordingly, when the first sheet Sa is conveyed, the heater unit 32 does not come into contact with the first sheet Sa, and therefore the first sheet Sa is not heated.

  With such a configuration, the control unit 5 causes the first sheet Sa to be supplied from the supply unit of the first sheet Sa (not shown) to the movable side suction unit 31, and the second sheet supply unit (not shown) supplies the first sheet Sa to the fixed side suction unit 41. Two sheets Sb are supplied.

  Then, the control unit 5 causes the movable side suction portion 31 to suck and hold the first sheet Sa and causes the fixed side suction portion 41 to suck and hold the second sheet Sb. At this time, power is supplied to the heater unit 32 and the temperature is raised to a predetermined temperature (a temperature at which welding is possible). In addition, the movable side unit 3 that holds the first sheet Sa by suction moves above the fixed side unit 4 and stands by.

  Thereafter, the control unit 5 lowers the movable side unit 3 toward the fixed side unit 4 and superimposes the first sheet Sa on the second sheet Sb. At this time, the movable unit 3 continues to descend against the suction side spring 34. As a result, the suction side spring 34 contracts, and the heater unit 32 contacts the peripheral edge of the first sheet Sa.

  After the heater unit 32 comes into contact with the first sheet Sa, both the suction side spring 34 and the heater side spring 35 contract. In the process in which the suction side spring 34 and the heater side spring 35 contract together, the first sheet Sa and the second sheet Sb are brought into close contact with each other by the spring force of the springs 34 and 35 and are heated by the heater unit 32. It will be. Hereinafter, this position is referred to as a welding position.

  When the movable unit 3 reaches the welding position, the control unit 5 stops the lowering of the movable unit 3 and continues this state for a predetermined time (welding time), whereby the first sheet Sa and the second sheet Welding with the sheet Sb is performed. Thereby, the peripheral part of 1st sheet | seat Sa and 2nd sheet | seat Sb welds, and a bag-shaped sheet | seat is formed.

  The welding time is set in advance according to welding conditions such as the material of the sheet to be welded, its thickness, the temperature of the heater unit 32, and the like, and is stored in the control unit 5.

  After completing the welding of the first sheet Sa and the second sheet Sb, the control unit 5 instructs the blower (not shown) to blow air from the movable side suction portion 31 and raises the movable side unit 3. Hereinafter, this air blow is referred to as a peeling blow. When the raising of the movable unit 3 starts, the heater side spring 35 has a smaller amount of contraction than the suction side spring 34, so that the heater unit 32 is first separated from the first sheet Sa, and then the movable side suction portion 31 is moved to the first sheet. You will be away from Sa. At this time, since the blow for peeling is performed from the movable side adsorption portion 31, the bag-like sheet is separated from the movable side adsorption portion 31 and remains in the fixed side unit 4.

  Of course, when the movable side unit 3 is raised, it is possible to cause the peeling blow from the fixed side suction portion 41 instead of from the movable side suction portion 31. In this case, when the ascent of the movable side unit 3 is started, the first sheet Sa is not separated from the movable side adsorption unit 31 and the second sheet is separated from the fixed side adsorption unit 41. However, since the heater unit 32 is separated from the first sheet Sa, unnecessary heating is prevented. In this way, when the bag-like sheet is adsorbed to the movable-side unit 3 when the movable-side unit 3 is lifted, the manufactured bag-like sheet can be easily conveyed to the next step.

  By the way, in order to shorten the welding time, it is necessary to shorten the welding time by increasing the welding temperature of the heater unit 32. However, when the welding temperature is increased, the allowable range such as the welding time for preventing stringing and scoring, and the speed at which the heater unit 32 moves away from the welding region is reduced.

  Further, when the speed at which the heater unit 32 moves away from the welding region is increased, a large negative pressure acts on the bag-like sheet due to the rise of the movable side adsorption portion 31. Then, due to the negative pressure, the bag-like sheet is attracted to the movable unit 3 to cause a positional shift or wrinkles.

  Therefore, in the present embodiment, the movable unit 3 is raised in three sections (first to third sections). The rising speed in the first section of the movable unit 3 is the first speed, the rising speed in the second section is the second speed, and the rising speed in the third section is the third speed. The descending speed of the movable unit 3 is a uniform speed.

  At this time, a mode (Case 1) in which the bag-shaped sheet is separated from the movable unit 3 and remains in the fixed unit 4 and a mode (Case 2) in which the bag-shaped sheet is separated from the fixed unit 4 and rises together with the movable unit 3 are provided. is there. Case 1 and Case 2 have the same manufacturing procedure, but Case 1 performs blow for blower peeling from the movable-side adsorption part 31, but Case 2 differs in that blow for blower peeling is performed from the fixed-side adsorption part 41. That is, the blower peeling blow from the movable side suction part 31 causes the manufactured bag-like sheet to remain on the fixed side suction part 41 and is produced by performing blower peeling blow from the fixed side suction part 41. The bag-shaped sheet remains in the movable-side suction portion 31.

  FIG. 3 is a flowchart showing a procedure for manufacturing the bag-shaped sheet. FIG. 4 is an explanatory diagram when the movable side unit 3 is vertically raised in the case 1, and FIG. 5 is an explanatory diagram when the movable side unit 3 is raised obliquely in the case 1. FIG. 6 is an explanatory diagram when the movable side unit 3 is vertically raised in the case 2, and FIG. 7 is an explanatory diagram when the movable side unit 3 is obliquely raised in the case 2. Hereinafter, the case 1 will be described as an example.

  Steps S <b> 1 and S <b> 2: The control unit adsorbs the first sheet Sa to the movable side unit 3 and adsorbs the second sheet to the fixed side unit 4. When the suction of the first sheet Sa and the second sheet Sb is completed and the movable unit 3 is positioned at the standby position, the control unit 5 instructs the drive unit 33 to lower at a preset lowering speed (see FIG. 4 to 7 in FIG.

  Steps S3 to S4: When the lowering of the movable unit 3 is started, the control unit 5 determines whether or not the welding position has been reached. When the welding position is reached, the control unit 5 starts measuring the welding time.

  Steps S5 to S6: When the time measured reaches the welding time set in advance, the control unit 5 instructs the drive unit 33 to rise (state (B) in FIGS. 4 to 7).

  At this time, the control unit 5 controls the drive unit 33 to vertically move the movable unit 3 at a first speed that is equal to the descending speed (state (C) in FIGS. 4 to 7). The vertical increase at the first speed is a range from the welding position to a position increased by a distance corresponding to the thickness of the bag-shaped sheet (the sum of the first sheet Sa and the second sheet Sb and the thickness). Interval.

  At this time, the movable unit 3 rises vertically, so that the heater unit 32 can quickly leave the welding region. At this time, the movable-side suction part 31 is in a state (contact state) in which the bag-like sheet is pressed against the fixed-side suction part 41. Therefore, since no negative pressure is generated, priority is given to the heater unit 32 leaving the welding area quickly.

  Steps S7 to S8: When the movable unit 3 reaches the end position of the first section, the control unit 5 sets the rising speed to the second speed. The movable unit 3 ascends a predetermined section (second section) at the second speed (state (D) in FIGS. 4 to 7). The second speed is a speed that is slower than the first speed and does not shift the bag-like sheet due to the negative pressure generated by the rising of the movable unit 3. In addition, the end position of the second section is a position where the influence of negative pressure can be ignored. The second speed and the end position of the second section are determined by a preliminary test or the like and stored in the control unit 5.

  In this second section, the control unit 5 raises the movable side unit 3 vertically or obliquely. Which rising mode is selected is set based on the following reasons. That is, in the second section, the movable-side suction part 31 is in a state of starting to be separated from the bag-like sheet, and thus the bag-like sheet is displaced due to negative pressure. However, even if the vertical component of the ascending speed of the movable-side suction portion 31 is the same, there is a fact that the positional deviation of the bag-like sheet is smaller when it is obliquely raised than when it is vertically raised. This means that the effect on the bag-like sheet can be made smaller when it is obliquely elevated than when it is vertically elevated.

  This phenomenon can be interpreted as follows with reference to FIG. 2A and 2B are diagrams for explaining the occurrence of negative pressure. FIG. 2A is a diagram when the movable-side suction portion is vertically raised, and FIG. 2B is a diagram when the movable-side suction portion is vertically raised. When the movable-side adsorption unit 31 rises, as shown in FIG. 2, surrounding air flows so as to fill the volume of the movement locus of the movable-side adsorption unit 31 (hatched area). The inflow of air occurs because the volume area of the movement locus is lower than the surrounding area.

  This means that if the inflow of air per unit time is the same as the increase in volume of the movement trajectory per unit time, the hatched area can be regarded as almost the same pressure as the atmospheric pressure, and Can be ignored. However, it takes a finite time for air to move to the middle of the volume of the movement trajectory, and negative pressure is generated during this time.

  When the movable side adsorbing portion 31 rises vertically, air flows from the inlet Ra, but when it moves obliquely, air flows from Rb. At this time, the area of the inlet Rb> the area of the inlet Ra, and the distance to the center of the volume of the movement locus is shorter for the inlet Rb. For this reason, if the air inflow rate is the same, the amount of inflow per unit time increases more obliquely, and it reaches the center of the volume of the moving track in a short time, greatly reducing the negative pressure effect. it can. This function is described as a negative pressure suppression function.

  Of course, since the rising speed of the movable-side adsorption part 31 is slow, the negative pressure suppressing function cannot be obtained when the air inflow speed can be ignored with respect to the rising speed.

  Further, in addition to the negative pressure suppressing function, the function of moving the generated bag-like sheet to the carry-out position or the supply position of the first sheet Sa is obtained for the oblique rise. Hereinafter, it is described as a next process linkage function. Thereby, there exists an advantage which can shorten the manufacturing time of a bag-shaped sheet.

  Steps S9 to 11: After passing the second section, it is not necessary to consider the influence of negative pressure (nearly no negative pressure is generated), so the control unit 5 sets the third speed to the same speed as the first speed. To instruct. Thereby, manufacture of a bag-like sheet is completed (the state of (e) in FIGS. 4 to 7). The rise at this time can be vertical rise or oblique rise, and is selected from the viewpoint of whether or not to cause the next process cooperation function.

With such a configuration, even when the movable unit 3 is raised at high speed, it is possible to perform the welding process without causing stringing or scoring, and without causing a displacement due to negative pressure. Become.
Second Embodiment
Next, a second embodiment of the present invention will be described. In previous 1st Embodiment, in order to suppress generation | occurrence | production of a negative pressure, the 2nd area raised the movable side adsorption | suction part 31 at a slower speed than the 1st area. The generation of the negative pressure occurs because the surrounding air cannot fill the volume of the movement locus of the movable side adsorption unit 31 generated when the movable side adsorption unit 31 is raised in real time. Therefore, in the present embodiment, air blow can be performed toward the volume of the movement locus. This air blow is referred to as a negative pressure relief blow.

  FIG. 8 is a configuration diagram of the welding apparatus 2B having such a configuration. In addition, about the same structure as the welding apparatus 2A which concerns on 1st Embodiment, description is abbreviate | omitted suitably using the same code | symbol.

  The welding apparatus 2B according to the present embodiment is different from the welding apparatus 2A according to the first embodiment in that a blower 20 is additionally provided. A plurality of nozzles of the blower 20 are provided toward the suction surface of the fixed-side suction part 41.

  FIG. 9 is an explanatory diagram when the movable side unit 3 is vertically raised in the case 1, and FIG. 10 is an explanatory diagram when the movable side unit 3 is vertically raised in the case 2. 9 and 10, the dotted arrow indicates the negative pressure relief blow. Needless to say, the movable unit 3 may be lifted obliquely.

  In the case of Case 2, the blower 20 is arranged so as to blow air between the suction surface of the fixed-side suction part 41 and the bag-like sheet. However, in either case 1 or case 2, the bag-like sheet is thinner than the air layer of the negative pressure relief blow, so the position of the blower 20 is not changed and the nozzle direction (negative pressure relief blow) is changed. It is only necessary to adjust the direction). Hereinafter, the case 1 will be described as an example.

  The first sheet Sa and the second sheet Sb are sucked and held by the movable-side suction portion 31 and the second-side sheet Sb is sucked and held by the movable-side suction portion 41 (the state shown in FIGS. 9 and 10 (A)).

  And when welding is performed and the movable side adsorption | suction part 31 leaves | separates from a bag-shaped sheet | seat, the blow for negative pressure relaxation starts from the blower 20 (the state of (b) of FIG. 9, FIG. 10). Thereby, in addition to the air flowing in from the surroundings in an attempt to relieve the negative pressure between the movable side adsorbing portion 31 and the bag-like sheet, the air from the blower 20 enters, so that the generation of the negative pressure can be greatly reduced. It becomes possible (states (c) to (e) in FIGS. 9 and 10).

  Thereafter, the movable side unit 3 moves up at the first speed rising at the first speed, at the second speed rising at the second speed slower than the first speed, and at the third speed rising at the third speed same as the first speed. After the section, production is completed.

  With such a configuration, even when the movable unit 3 is raised at high speed, it is possible to perform the welding process without causing stringing or scoring, and without causing a displacement due to negative pressure. Become.

Sa 1st sheet Sb 2nd sheet 2A, 2B Welding device 3 Movable side unit 4 Fixed side unit 5 Control unit 20 Blower 31 Movable side adsorption part 31a Adsorption surface 32 Heater unit 32a Working surface (heating area)
33 Drive unit 34 Adsorption side spring 35 Heater side spring 41 Fixed side adsorption unit

Claims (8)

It is a welding apparatus for producing a bag-like sheet by superimposing a first sheet and a second sheet that can be welded by heating, and welding a predetermined peripheral edge part,
A fixed-side unit having a fixed-side suction portion for sucking and holding the second sheet;
A movable-side suction part that sucks and holds the first sheet, and the movable-side suction part are held via a spring, and the suction surface of the movable-side suction part is brought into contact with the suction surface of the fixed-side suction part. A movable unit composed of a drive unit that is spaced apart and a heater unit that is disposed around the movable side adsorption unit and is held by the drive unit so that the heating surface is higher than the adsorption surface of the movable side adsorption unit. Side unit,
A control unit that controls at least the operation of the drive unit, the adsorption operation of the fixed-side adsorption unit, and the adsorption operation of the movable-side adsorption unit;
By operating the drive unit to bring the movable side suction part into contact with the fixed side suction part, and further compressing the spring, the heater unit can come into contact with the suction surface of the fixed side suction part. Arranged,
Speed between the heater unit said than the speed away from the suction surface of the stationary suction part, away a predetermined amount the stationary suction part and the movable suction unit is set in advance from the start spaced apart from the fixed-side suction unit Is set so as to be further separated at a high speed after the predetermined amount has been set apart and after a predetermined amount has been set apart. The welding apparatus according to claim 1, wherein the heater unit is held by the drive unit via a second spring. Air is blown between the suction surface of the fixed side suction portion and the suction surface of the movable side suction portion when the fixed side suction portion and the movable side suction portion are separated from each other around the fixed side suction portion. The welding apparatus according to claim 1, further comprising a blower. The drive unit, in addition to the direction perpendicular to the suction surface of the movable suction unit, also the in-plane direction of the suction surface of the movable suction unit is movably,
Further, after the previous SL movable suction unit is separated by a predetermined amount set in advance from the fixed-side suction portion, of the movable suction unit is moved to the drive unit in a direction perpendicular to the suction surface of the movable suction unit welding apparatus according to any one of claims 1 to 3, characterized in that it is set to move in-plane direction of the suction surface. It is a welding method in which a first sheet and a second sheet that can be welded by heating are overlapped, and a predetermined peripheral edge is welded to produce a bag-like sheet,
A procedure for adsorbing and holding the second sheet on the fixed-side adsorption unit;
A procedure of adsorbing and holding the first sheet on the movable-side adsorption unit;
A procedure for moving the fixed-side suction part or the movable-side suction part to face the suctioned first sheet and the second sheet;
The drive moving parts that holds the movable suction unit via the spring is lowered is brought into contact via the said first and second sheets the movable suction unit relative to the stationary suction unit Procedure and
Further, the drive unit is lowered to compress the spring between the drive unit and the movable side adsorption unit, and the heater unit held by the drive unit and disposed around the movable side adsorption unit is provided in the first sheet. A procedure for creating a bag-like sheet by contacting and heating the predetermined peripheral edge of the first sheet and the second sheet,
A heater unit separation procedure for raising the drive unit and separating only the heater unit from the bag-like sheet;
A procedure for turning off the suction of the movable side suction part;
The drive side is further raised at a speed slower than the drive speed in the heater unit separation procedure to release the compression of the spring, and the movable side for separating the movable side suction part from the bag-like sheet by a preset distance. Adsorption part separation procedure;
A welding method comprising: a retreating procedure for separating a relative position between the movable suction unit and the fixed suction unit at a speed faster than a separation speed in the movable suction unit separation procedure. The welding method according to claim 5 ,
The welding method according to claim 1, wherein the step of separating the movable side suction portion includes a step of blowing air between the movable side suction portion and the bag-like sheet. It is a welding method in which a first sheet and a second sheet that can be welded by heating are overlapped, and a predetermined peripheral edge is welded to produce a bag-like sheet,
A procedure for adsorbing and holding the second sheet on the fixed-side adsorption unit;
A procedure of adsorbing and holding the first sheet on the movable-side adsorption unit;
A procedure for moving the fixed-side suction part or the movable-side suction part to face the suctioned first sheet and the second sheet;
A step of lowering a drive unit that holds the movable-side suction unit via a spring so that the movable-side suction unit contacts the fixed-side suction unit via the first sheet and the second sheet; ,
Further, the drive unit is lowered to compress the spring between the drive unit and the movable side adsorption unit, and the heater unit held by the drive unit and disposed around the movable side adsorption unit is provided in the first sheet. A procedure for creating a bag-like sheet by contacting and heating the predetermined peripheral edge of the first sheet and the second sheet,
A heater unit separation procedure for raising the drive unit and separating only the heater unit from the bag-like sheet;
A procedure for turning off the suction of the fixed-side suction part;
A fixed side that further raises the drive unit at a speed slower than the drive speed in the heater unit separation procedure to release the compression of the spring and separate the fixed side adsorption unit from the bag-like sheet by a preset distance. Adsorption part separation procedure;
A welding method comprising: a retreating step of separating a relative position between the movable side adsorbing part and the fixed side adsorbing part at a speed faster than a separation speed in the fixed side adsorbing part separation procedure.
The welding method according to claim 7 ,
In the fixing side adsorption part separation procedure, the welding method characterized by including a procedure of blowing air between the fixed side adsorption part and the bag-like sheet.

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