JPH0665785B2 - Thermal welding device for strip-shaped sheets - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to mutual thermal welding of strip-shaped sheets of nonwoven fabric, paper, synthetic resin or the like, which are continuously supplied in a folded or laminated state, in a widthwise streak shape at appropriate intervals. Related to the device.

(Prior Art) As a device for heat-bonding continuously supplied strip-shaped sheets in the widthwise streaks at intervals in the longitudinal direction, a heat roll and a receiving roll that rotate axially are arranged in the middle of the sheet traveling direction. Then, an apparatus in which the sheet is supplied between the heat roll and the receiving roll and mutual welding is performed by the action of the heater-embedded pressing ridges fixedly provided on the periphery of the heat roll as the rotation of the heat roll is used. ing.

(Problems to be Solved by the Invention) By the way, recently, the sheet materials have been diversified, and strong welding strength is required in the field of use such as tea packs. It has been pointed out that welding only once is not enough. To enhance the welding strength, it is effective to perform the welding treatment twice or more, but installing two or more of the above devices side by side poses a space-related problem, and the welding is performed again so that the already welded portion is completely matched. It is very difficult to perform the positioning of the treatment, and since it takes time to perform the welding treatment again, the above-mentioned welding site is solidified and its effectiveness is not fully exhibited. There were problems such as.

The present invention has been made in view of the above, and does not change in space as compared with the conventional one-time welding apparatus, and moreover, effective welding can be performed twice or more, and the welding strength can be increased, and the thermal welding can be performed. It is an object of the present invention to provide a novel band-shaped sheet heat welding apparatus capable of optimally maintaining the heat retention state of a sheet during transfer between work locations.

(Means for Solving the Problems) A heat welding apparatus of the present invention that achieves the above object will be described with reference to the accompanying drawings. FIG. 1 is a longitudinal side view of the device according to the first aspect of the present invention, FIG. 2 is a front view of the device, FIG. 3 is an explanatory view of the operating state of the device, and FIG. 4 is a second view of the present invention. FIG. 5 is a vertical sectional side view of an apparatus according to an aspect, FIG. 5 is a front view of the apparatus, and FIG. 6 is an explanatory view of an operating state of the apparatus.

The heat welding apparatus of the present invention includes two inventions, the specified invention and the first related invention, and the heat welding apparatus according to the specified invention uses the roll-weld sheet 11 having the heat-welding belt-like sheet S continuously supplied in a folded or stacked state. A heating iron member 12 having a built-in heater 12a and having a pressing projection 12b on the outer side along the longitudinal direction and fixed along the longitudinal direction of the peripheral body of the base shaft 11, and the base shaft 11
A heat roll 1 comprising a guide cover 13 concentrically surrounding and surrounding the ridge 12b of the trowel member 12 so as to project in the centrifugal direction around the circumference of the body, and the surface thereof is coated with a heat-resistant and elastic material. The receiving rolls 2 and 3 are heat-welded to each other in a widthwise streak pattern at appropriate intervals, and the receiving rolls 2 and 3 are parallel to the heat roll 1 and are in a transposed state in the traveling direction of the sheet S. Are arranged in a relatively short distance at least at equal intervals, and the rotational peripheral speed on the surface of the guide cover 13 of the heat roll 1 is made to match the constant supply speed of the sheet S. That is, the same portion of the sheet S is transferred integrally with the heat roll 1 and is subjected to the heat welding action at least twice by the ridge 12b and the receiving rolls 2 and 3, and the guide cover 13 is provided in large numbers. Hole for heat dissipation 13
It is characterized in that it can be replaced with one with a.

Further, the welding device of the first related invention has a roll base shaft 51 and a heater 52a built-in for pressing the heat-welding belt-like sheet S connected and supplied in a folded or multi-layered state, and for pressing the outer portion along the longitudinal direction. A heat roll 5 including a heating iron member 52 having a protrusion 52b and fixed along the longitudinal direction of the peripheral body of the base shaft 51, and a large-diameter metal bottom roll 6 in the width direction at appropriate intervals. The heat rolls 5 are mutually heat-welded in a streak shape, and the heat rolls 5 are arranged in parallel with the bottom rolls 6 in parallel with each other along the traveling direction of the sheet S at a relatively short distance and at least two in parallel. That is, the rotational peripheral speed of the bottom roll 6 is matched with a constant supply speed of the sheet S, and the welding timing of the protrusion 52b of the downstream heat roll 5'is determined by the protrusion 52b of the upstream heat roll 5 in the width direction. Aligned to match the streak weld And it has the same position of the sheet S with receive at least two heat welding action by the heat roll 5, 5 'and the bottom roll 6, a plurality of cartridge heaters 7 in the vicinity of the outer peripheral surface of the lower roller 6
... is built in.

(Operation) In the apparatus of the first aspect, the long strip sheet S is continuously supplied between the heat roll 1 and the receiving roll 2 at a constant speed. The heat roll 1 is rotating at the same peripheral speed as the supply speed of the sheet S, and when the iron member 12 comes into contact with the receiving roll 2 due to the rotation, the sheet S sandwiched between the two is formed as the ridge 12b. Is pressed by. At this time, the protrusion 12b is the heater
Since the sheet S is heated by 12a, the sheet S is welded in a stripe shape in the width direction by this pressing force and heat [Fig. 3 (a)]. After that, the sheet S is fed integrally with the heat roll 1 by the guide of the guide cover 13, so that the sheet S advances in a state in which the strip 12b of the trowel member 12 is stopped at the welding portion a. When successively reaching the receiving roll 3 on the downstream side at a short distance in this state, the pressing force and heat similar to the above act repeatedly before the already welded portion a is cooled and solidified, and stronger welding is performed [3rd Figure (b)]. In particular, the guide cover 13 is disposed adjacent to the heating iron member 12, and the heat is transferred to the guide cover 13, so that the sheet S is kept warm while the sheet S and the guide pipe 13 go to the welding process on the downstream side. Also, due to the large number of heat dissipation holes 13a in the applied guide cover 13, the overheating is prevented in the summer or when the environmental temperature is high, the exudation of the hot-melt material in the sheet S is prevented, and the mutual welding is substantially eliminated by the subsequent welding process. Done completely. In this way, the sheet S that has passed through the receiving roll 3 on the downstream side is appropriately cut into pieces and aligned.

After the first welding process is performed by the trowel member 12 as described above, the sheet S moves in cooperation with the heat roll 1 and undergoes the second welding process, so that the welding sites before and after this may shift. In addition, both welding treatment intervals are short, and there is no concern of cooling and solidification between them, and extremely reliable and strong welding treatment is performed.

In the apparatus of the second aspect, the long strip-shaped sheet S is fed between the upstream heat roll 5 and the bottom roll 6 which rotates at the same peripheral velocity as the peripheral velocity of the sheet. It As the heat roll 5 rotates, its heating iron member 52
When the sheet S contacts the bottom roll 6, the sheet S sandwiched between the sheets is pressed by the ridge 52b. At this time, the ridge 52b
Since the sheet is heated by the heater 52a, the sheet S is welded in a stripe shape in the width direction by the pressing force and heat [FIG. 6 (a)]. When the heat roll 5 is supported by the telescopic cylinder 8, the impact at the time of the contact is caused by the telescopic rod.
The sheet S is absorbed by the sheet 81, and as a result, the sheet S is provided with a sharp welding line without being cut. After that, the sheet S proceeds with the rotation of the bottom roll 6 and reaches the heat roll 5'on the downstream side. Although the heat roll 5 ′ itself is also rotating, the contact timing of the iron member 52 with the bottom roll 6 is aligned so as to match the welded portion b of the heat roll 5 on the upstream side. With the progress of S, the heating iron member 52 in the downstream heat roll 5 '
The ridges 52b of the above are aligned with the already welded portion b on the peripheral body of the bottom roll 6 and heat and press the welded portion b [Fig. 6 (b)]. Therefore, in this case as well, the same portion is 2
Since the welding treatment is performed more than once, the welding strength increases. Moreover, the interval between the re-welding processes is short, and the plurality of cartridge heaters 7 ... Are built in near the outer peripheral surface of the bottom roll 6, so that the seat heat is appropriately maintained even when the outside air temperature is low such as in winter. In this case, the subsequent welding process is performed until the first welding process is completed by cooling and solidification, and almost complete welding is performed. The heat roll 5'on this downstream side
Also, when it is supported by the telescopic cylinder 8, the impact at the time of contact is absorbed by the telescopic rod 81, so that the sheet S is not cut and a sharp welding line is added as described above.

In the case of the device according to this second aspect, at least 2 as in the above case.
A stronger welding is possible by performing the welding process once, but in addition to this, since the bottom roll 6 is made of metal,
The pattern of the welded portion is clear, and the wear is small as in the case where the bottom roll 6 is made of a rubber material, which makes it possible to save labor in maintenance.

(Example) Next, an example will be described.

(Embodiment 1) In FIG. 1 to FIG. 3, three heating iron members 12 ... Are fixedly mounted on the peripheral body of the roll base shaft 11 of the heat roll 1 at equal intervals. The trowel member 12 has a cartridge-type heater 12a built in along the longitudinal direction thereof, and two pressing projections 12b, 12b are formed on the top surface of the trowel member 12. Also,
A guide cover 13 having an arcuate cross section is mounted between the iron members 12 concentrically with the roll base shaft 11.
13 ... Therefore, the circumference of the roll base shaft 11 is surrounded. The ridges 12b of the iron member 12 are positioned so as to slightly project (0.2 to 0.7 mm) in the centrifugal direction from the guide cover 13. The outer diameter of the surrounding of the guide cover 13 is not specified, but when cutting each welded part to make this cut piece into a product, the length dimension of this product × the number of iron members fixed (in this example, 3) ÷ π

The base shaft 11 of the heat roll 1 is a slide frame 1 on both sides.
The slide frames 14 and 14 are axially supported by the shafts 4 and 14, and the slide frames 14 and 14 are vertically slidably inserted in the body frame 15. Further, an abutment 17 is installed on the main body frame 15 by adjusting screws 16 and 16 which are screwed so as to be vertically screwed and screwed back and forth. A support shaft 17a is vertically movably provided at the center of the support stand 17, and the slide frame 14 is fixed to the lower end of the support shaft. A spring 17b is mounted between the slide frame 14 and the abutment 17 so that the spring 17b does not absorb the impact applied to the heat roll 1 during the welding process. It is possible to use a telescopic cylinder instead of the support shaft 17a and the spring 17b. The adjusting screws 16 and 16 are capable of adjusting the pressing force against the receiving rolls 2 and 3 according to the degree of wear of the protrusion 12b of the iron member 12, and thereby the heat roller 1 can be properly positioned. Made possible. A gear 11a is fixed to the base shaft 11 outside the main body frame 15, and power is transmitted from a drive source via the gear 11a, so that the heat roll 1 rotates about its axis.

A large number of heat dissipation holes 13a are formed in the guide cover 13. As described above, the guide cover 13 transfers heat from the trowel member 12 and retains heat. The retained heat enables effective welding of the sheet S, but this heats up the sheet S.
Since there is a possibility that the heat-welded substance contained in the above will be exuded during the transfer, it is desirable to use the guide cover 13 having the holes 13a as shown in the figure, especially in the summer or when the ambient temperature is high.

The surface of the receiving rolls 2 and 3 is silicon or Teflon processed, and due to its elasticity, the heat roll 1
When the iron member 12 is pressed, the impact is absorbed and the cutting of the sheet S is prevented. The receiving rolls 2 and 3 are axially supported by holders 21 and 31 mounted in the main body frame 15 so that the receiving rolls 2 and 3 can be adjusted toward and away from the heat roll 1. These spindles 20,3
The gear 22 (32) is fixed to the end of 0, and the gear 22 (32)
Is meshed with a gear 11b fixed to the support shaft 11 of the heat roll 1 to transmit power.

Thus, in the first receiving roll 2, the heat roll 1
The sheet S welded by the saw iron member 12 moves by the guide action of the guide cover 13 in a state where the protrusions 12b, 12b of the iron member 12 are aligned with the already welded portion a, and the second receiving roll 3
And is heat-welded again. And the first receiving roll 2
Since the temperature is kept by the guide cover 13 during the transition from the second to the second receiving roll 3, cooling and solidification does not occur during this period, and stronger and complete welding is performed.

(Embodiment 2) In FIGS. 4 to 6, a support shaft 60 of a large-diameter bottom roll 6 is pivotally supported by a main body frame 61, and power is transmitted from a power source (not shown) via a gear 60a. The belt-shaped sheet S can be rotated at the same peripheral speed as the supply speed. Guide rolls 62, 62 are axially supported at the front and rear of the bottom roll 6, and the sheet S is regulated by the guide rolls 62, 62, and the peripheral body of the bottom roll 6 is transported as it rotates.

A plurality of cartridge heaters 7 ... Are incorporated at intervals near the outer peripheral surface of the bottom roll 6 and function to keep the sheet S warm during the first and second welding. By this heat retention function,
When the outside air temperature is low, it is possible to prevent a decrease in heat-welding property especially in winter. The outer diameter of the bottom roll 6 is preferably three times or more the maximum diameter of the heat roll 5 (the diameter of the rotation locus of the tip of the iron member 52), and the bottom roll 6
The surface of is preferably temper-hardened, hard-chrome plated and polished. Due to the work finish, in particular, the low friction property, when the iron member 52 comes into contact with the rotation of the heat roll 5, its impact force is released in the rotational direction of the bottom roll 6 to prevent the iron member 52 from being damaged, and Prevent the adhesion of flux. Although there is almost no adhesion of the flux as described above, in the illustrated example, the doctor 9 is installed on the lower surface of the bottom roll 6 so as to be slidable, and the flux adhered to the surface of the bottom roll 6 by the doctor 9 is removed. It is designed to be completely removed.

Further, in this example, two heat rolls 5 and 5'are arranged so as to be capable of rolling contact with the upper surface of the bottom roll 6. The heat roll 5 (5 ') comprises a roll base shaft 51 and a trowel member 52. Both heat rolls 5 and 5'include three trowel members 52 ... It is fixed to. A cartridge type heater 52a is built in the iron member 52 along the longitudinal direction thereof, and two pressing projections are provided on the top surface of the iron member 52.
52b and 52b are formed. The roll base shafts 51, 51 are pivotally supported by slide frames 53, 53 that are vertically slidably inserted in the body frame 61. Also, the body frame 6
1. Abutments 54, 54 are erected on 1, and the abutments 54, 54 are equipped with up-and-down telescopic cylinders 8, 8 and are supported by the main body frame 61 via adjustment screws 55 ... ing. The slide frames 53, 53 are fixed to the lower ends of the rods 81, 81 of the cylinders 8, 8, and the rods 81, 81
Is adjusted to the full stroke. By adjusting the vertical position of the adjusting screws 55 ... And adjusting the protruding width of the rods 81, 81, it is possible to absorb the impact applied to the iron member 52, and it is also possible to adjust the desired thickness of the welded portion. Gears 51a, 51a are fixed to one end of the roll base shafts 51, 51.
51a and 51a mesh with the gear 60b of the bottom roll 6, and the power is transmitted to rotate the shaft.

Thus, the sheet S supplied on the peripheral surface of the bottom roll 6 reaches the first heat roll 5, and the iron member 52
To undergo welding treatment. With the subsequent rotation of the bottom roll 6 thereafter, the bottom roll 6 receives the guiding action thereof and proceeds together.
Reaching the second heat roll 5 ', the already welded portion b is welded again by the iron member 52 of the heat roll 5'. Then, during the transition from the first heat roll 5 to the second heat roll 5 ', the heat retaining action of the heaters 7 ...
The heat-welding treatment is performed again without being solidified by cooling, and stronger and complete welding is performed.

(Advantages of the Invention) As described above, the heat welding apparatus of the present invention enables welding at least twice at the same location of the sheet in a small space, and the sheet is kept warm appropriately. The welded portion is surely re-welded, the entrainment speed is further increased to enable extremely efficient welding treatment, and high strength welding strength can be obtained. It is extremely suitable for continuous welding treatment.

[Brief description of drawings]

FIG. 1 is a longitudinal side view of the device according to the first aspect of the present invention, FIG. 2 is a front view of the device, FIG. 3 is an explanatory view of the operating state of the device, and FIG. 4 is a second view of the present invention. FIG. 5 is a vertical sectional side view of an apparatus according to an aspect, FIG. 5 is a front view of the apparatus, and FIG. 6 is an explanatory view of an operating state of the apparatus. (Description of symbols) 1 ... Heat roll, 11 ... Roll base, 12 ... Trowel member, 12a ... Heater, 12b ... Pressing ridge, 13 ... Guide cover, 13a ... Hole, 2, 3 ... Receiving roll, 5,5 '... Heat roll, 51 ... Roll base, 52 ... Trowel member, 52a ...
… Heater, 52b …… Pressing ridge, 6 …… Bottom roll,
7 ... Cartridge heater.

Claims (2)

[Claims] 1. A heat-welding strip-shaped sheet (S), which is continuously supplied in a folded or multi-layered state, has a roll base shaft (11) and a heater (12a) built therein and is used for pressing the outer portion along the longitudinal direction. A heating iron member (12) having a ridge (12b) fixed along the longitudinal direction of the peripheral body of the base shaft (11), and the iron member (12) attached to the peripheral body of the base shaft (11). Heat roll (1) consisting of a guide cover (13) concentrically surrounding and fixed so that the ridges (12b) of the ridge (12b) project in the centrifugal direction, and a receiving roll whose surface is covered with a heat-resistant and elastic material ( 2) In the heat welding device for band-shaped sheets, which are heat-welded to each other in a widthwise streak pattern at appropriate intervals, the receiving rolls (2) and (3) are parallel to the heat roll (1) around the heat roll (1). In addition, in the transferred state, they are arranged in a relatively short distance along the traveling direction of the sheet (S) at least at equal intervals. The rotational peripheral speed on the surface of the guide cover (13) of the heat roll (1) is matched with the constant supply speed of the sheet (S), and the same position of the sheet (S) is at the heat roll ( 1)
And the guide rolls (12b) and the receiving rolls (2) and (3) are subjected to heat welding at least twice, and the guide cover (13) has a large number of holes for heat radiation ( 13a ……) is replaceable with a strip-shaped sheet heat-welding device. 2. A heat-welding strip-shaped sheet (S) which is continuously supplied in a folded or multilayered state, has a roll base shaft (51) and a heater (52a) built-in, and presses the outer portion along the longitudinal direction. A heat roll (5) including a heating iron member (52) having a ridge (52b) and fixed along the longitudinal direction of the peripheral body of the base shaft (51), and a large-diameter metal bottom roll ( 6) In the heat welding device for band-shaped sheets, which are heat-welded to each other in a widthwise streak shape at appropriate intervals, the heat roll (5) is a sheet in the state of being parallel to and transposed around the bottom roll (6). At least two of them are juxtaposed at a relatively short distance along the traveling direction of (S), and the peripheral speed of rotation of the bottom roll (6) is made to match a constant supply speed of the sheet (S), and the downstream speed is made downstream. The welding timing due to the ridge (52b) of the side heat roll (5 ') is upstream side Ridges of trawl (5) (52
It is aligned so as to match the widthwise streak welded part by b), and the same position of the sheet (S) is on the heat roll (5).
At least 2 by (5 ') and bottom roll (6)
The bottom roll (6) is subjected to the heat-welding action.
A plurality of cartridge heaters (7 ...) Are built in in the vicinity of the outer peripheral surface of the strip-shaped sheet thermal welding apparatus.