JP5790541B2 - Sheet splicing device and splicing method - Google Patents

Description

  The present invention relates to a splicing device and a splicing method used for joining a sheet of nonwoven fabric or plastic. More specifically, in the present invention, when two sheets are joined, both sheets are joined by heat welding or ultrasonic welding.

  For example, in a disposable diaper production line, a sheet is unwound from a raw roll and transported, and an adhesive is applied to the sheet or cut into an appropriate size. In the manufacturing industry of articles processed from such sheets, when the quantity of the sheets wound around the used rolls is exhausted or decreased in order to produce a large number of articles continuously. In addition, an operation is performed in which a sheet wound around an unused raw roll is joined to the sheet in use and joined.

  Conventionally, splicing devices have been used for the work of joining such sheets. The splicing device joins the end portion of the used sheet and the start end portion of the unused sheet so that the sheet can be continuously conveyed. In the conventional splicing device, an adhesive tape is used to join a used sheet and an unused sheet (Patent Document 1). For example, in the splicing device described in Patent Document 1, the end of the preceding sheet unwound from the raw roll in use and the leading end of the connecting sheet are brought into a butted state, and adhesive tape is applied to both the front and back surfaces of the butted portion. We are going to stick.

  However, there are various problems with the splicing device using the adhesive tape for joining the used sheet and the unused sheet. For example, when an adhesive tape is used for joining sheets, the thickness of the joined sheets increases. For this reason, for example, when a bonded sheet is sandwiched and transported by two opposing rollers, if a portion whose thickness has been increased by applying an adhesive tape is sandwiched between rollers, the roller may be impacted and damaged. there were. Also, if the adhesive tape is left stuck between the sheets, the adhesive on the adhesive tape protrudes from the sheets and adheres to other sheets, causing an error in the conveyor and processing machine, and stopping. There is a fear that it will end. Further, in the splicing device using the adhesive tape, it is necessary to cut the adhesive tape to a necessary width and length and attach it to the tip of the connection sheet. Further, for example, in the manufacturing process of a disposable diaper, the adhesive tape is an unnecessary foreign substance on the main body. For this reason, there exists a possibility that an adhesive tape may mix in the disposable diaper which is a product of manufacture, for example, or it may generate inferior goods. In addition, it was necessary to check whether the pieces of adhesive tape were attached to a part of the diaper during the manufacturing process of the diaper, which resulted in a decrease in production efficiency.

  In this regard, as a proposal for solving the problem of the splicing device using the above-mentioned adhesive tape, it has been proposed to perform ultrasonic welding or heat welding for joining a used sheet and an unused sheet ( Patent Document 2). Thus, by joining the sheets using ultrasonic welding or heat welding, it is not necessary to use an adhesive tape as in the prior art. For this reason, it is possible to avoid an increase in the thickness of the joined sheets, and it is possible to prevent the conveyance rollers from being damaged. Further, since the adhesive tape is not used for joining the sheets, it is possible to prevent the joined sheet from adhering to other sheets. Further, it is not necessary to cut the adhesive tape to the required width and length and attach it to the tip of the connecting sheet. Furthermore, since there is no possibility that the adhesive tape will be mixed into the manufactured product as a foreign object, the non-defective product shipment rate can be improved.

Japanese Patent Laid-Open No. 06-040615 JP 2005-298162 A

  However, as in Patent Document 2, there are various merits in a technique for joining sheets by ultrasonic welding or thermal welding. However, in the technique for joining sheets by ultrasonic welding or thermal welding, heat is applied to the sheets. The problem remains that the melted portion of the sheet does not peel off while being adhered to the welding apparatus for application. That is, if the sheet remains adhered to the heat application surface of the welding apparatus, a large tension is applied to the sheet when the sheet is pulled in the conveyance direction, causing a situation where the sheet itself is damaged or broken. Further, if the sheet remains adhered to the heat application surface of the welding apparatus, the sheet is heated more than necessary, and the sheet is melted. As a result, there is a fear that the sheet is cut by a welding apparatus intended to join the sheets. For example, when a sheet joined by a splicing device breaks, the sheet must be manually joined again, which greatly reduces the production efficiency.

  For this reason, at present, the sheet is quickly peeled off from the heat application surface of the welding apparatus in order to prevent the sheet from being damaged or cut after the sheets are joined by ultrasonic welding or thermal welding. There is a need for a splicing device and a splicing method that can be used.

Therefore, the inventors of the present invention have intensively studied the means for solving the above-mentioned problems of the conventional invention. As a result, the hood portion is provided around the joining region where heat is applied to the sheets and the sheets are joined to each other. It was found that the two sheets can be quickly separated from the welding apparatus by the hood after the two sheets are welded by urging them in the direction in which they contact each other. The inventor has conceived that the problems of the prior art can be solved based on the above knowledge, and has completed the present invention.
More specifically, the present invention has the following configuration.

The first aspect of the present invention relates to a splicing device.
The splicing device of the present invention includes a first original fabric roll 1a, a second original fabric roll 1b, and splicing means 2.
The first sheet rolls out the first original fabric roll 1a.
The second raw fabric roll 1b feeds the second sheet.
The splice means 2 joins the other sheet to one of the first sheet and the second sheet, and performs sheet splicing.
The splicing means 2 has a first joint 20a and a second joint 20b provided at a position facing the first joint 20a.
The splicing means 2 applies heat to both the first sheet and the second sheet with the first sheet 20 and the second sheet 20b sandwiched between the first sheet and the second sheet 20b. The two sheets are welded together.
Here, both or any one of the 1st junction part 20a and the 2nd junction part 20b has the junction area | region 21, the hood part 22, and the urging | biasing part 23. FIG.
The joining region 21 is a region where heat can be applied to both sheets in a state where both sheets are sandwiched between the first joining portion 20a and the second joining portion 20b.
The hood portion 22 is provided around the joining region 21. Further, the hood portion 22 can travel to a position protruding from the joining region 21 in a direction in which the hood portion 22 abuts both the sheets. Furthermore, the hood part 22 can be retracted at least to the same position as the joining area 21.
And the urging | biasing part 23 is urging | biasing the hood part 22 in the direction contact | abutted to a sheet | seat.

  As described above, the splicing device of the present invention applies heat to the first sheet and the second sheet by ultrasonic welding or heat welding, and joins both sheets. The splicing device of the present invention has a hood portion 22 around a joining region 21 for applying heat to the sheets, and the hood portion 22 is urged by the urging portion 23 in a direction to contact both sheets. Therefore, after both sheets are welded, the two sheets can be quickly separated from the joining region 21 by the hood portion 22. For this reason, according to the present invention, the problem that the melted portion of the sheet does not dissociate while adhering to the joining region 21 can be solved. That is, according to the present invention, it is possible to prevent the bonded sheet itself from being damaged or broken. Furthermore, according to the present invention, since heat can be applied to the sheet for a necessary time, a situation in which the sheet is heated more than necessary and breaks can be avoided.

In the splicing device of the present invention, it is preferable that the joining region 21 formed in the first joining portion has a plurality of convex portions 24.
And it is preferable that the some convex part 24 is formed so that a several row may be made along the advancing direction of both the 1st sheet | seat and the 2nd sheet | seat.

  Like the said structure, the some convex part 24 formed in the junction area | region 21 of the 1st junction part 20a clamps a sheet | seat between the 2nd junction parts 20b. For this reason, the pattern of the some convex part 24 becomes a joining pattern of a sheet | seat. In this way, by forming the plurality of convex portions 24 in the joining region 21, the welded sheet is less likely to adhere to the joining region 21. In addition, since the joining pattern of the sheets is a pattern formed in a plurality of rows along the traveling direction, the joining patterns are not connected in the width direction of the sheet, so that the joined sheets are not easily broken in the conveyance process.

  In the splicing device of the present invention, the plurality of convex portions 24 are further formed to form a plurality of rows along a direction (width direction) orthogonal to the traveling direction of both the first sheet and the second sheet. It is preferable that That is, it is preferable that the plurality of convex portions 24 be formed in the bonding region 21 in a pattern of a plurality of rows and a plurality of columns.

  By forming the plurality of convex portions 24 in a pattern of a plurality of rows and a plurality of columns as in the above configuration, a gap is generated between each convex portion 24 in the sheet traveling direction and its width direction. For this reason, for example, the plurality of convex portions 24 have a dot shape. In this way, for example, by forming a plurality of dot-like convex portions 24 in the joining region 21, the welded sheet is more easily separated from the joining region 21. Further, by forming the plurality of convex portions 24 in a dodd shape, the pattern of the convex portions 24 is not connected in the width direction of the sheet, so that the joined sheets are less likely to break during the conveying process.

The splicing device of the present invention preferably further includes a remaining amount detection unit 11. The remaining amount detector 11 detects the remaining amount of the first sheet wound around the first original fabric roll 1a and the second sheet wound around the first second original fabric roll 1b. be able to.
In this case, in the splicing device of the present invention, when the remaining amount detecting unit 11 detects that the remaining amount of the used sheet of the first sheet and the second sheet is equal to or less than a predetermined amount. It is preferable to drive a reciprocating drive mechanism that moves both or one of the first joint portion 20a and the second joint portion 20b in a direction in which both the first sheet and the second sheet are sandwiched. And after this reciprocating drive mechanism drives, it is preferable to operate the 1st junction part 20a and the 2nd junction part 20b so that heat can be provided with respect to both sheets.

  In a normal sheet conveying machine, the frequency of sheet splicing work is not so high, and there is a long time period during which the sheet splicing work is not performed. For this reason, for example, even in the time zone when the sheet splicing operation is not performed, power is supplied to the thermal welding apparatus and the ultrasonic welding apparatus including the first joint portion 20a and the second joint portion 20b, and the apparatus is operated. As a result, power is wasted. Therefore, in the splicing device of the present invention, the remaining amount detecting unit 11 detects that the remaining amount of the sheet in use has become a predetermined amount or less, and the first joint 20a and / or the second joint is detected by the reciprocating drive mechanism. Energy efficiency can be improved by performing control so that electric power is supplied to the heat welding apparatus and the ultrasonic welding apparatus after the movement of the joint portion 20b is started.

The second aspect of the present invention is a splicing method. The splicing method of the present invention is basically executed by the splicing device according to the first aspect.
That is, the splicing method of the present invention is not applied to the sheet in use among the first sheet fed out from the first original roll 1a and the second sheet fed out from the second original roll 1b. Join the used sheets and join the sheets.
In the step of joining the sheets, heat is applied to the first and second sheets while the first and second sheets are sandwiched between the first and second joints 20a and 20b. This is a splicing step in which the two sheets are welded together.
And in the splicing process,
The hood portion 22 provided around the joining region 21 of the first joining portion 20a that applies heat to both sheets is advanced to a position that protrudes from the joining region 21 in the direction of contacting both sheets. Process,
A step of sandwiching both the sheets by the first joint portion 20a and the second joint portion 20b while the hood portion 22 is in progress;
Retreating the hood portion 22 to at least the same position as the joining region 21;
A process of applying heat to both sheets by the first joint 20a and the second joint 20b is performed.

  According to the above process, after the sheets are welded and joined, both sheets can be quickly separated from the joining region 21 by the hood portion 22, so that the dissolved portion of the sheet does not dissociate while adhering to the joining region 21. Can solve the problem.

  In the present invention, heat is applied to the first sheet and the second sheet by ultrasonic welding or heat welding to join both sheets. And this invention has the hood part 22 around the joining area | region 21 which gives a heat | fever to a sheet | seat, and since this hood part 22 is urged | biased in the direction contact | abutted to both sheets, both sheets are welded. After that, both sheets can be quickly separated from the joining region 21 by the hood portion 22. Therefore, according to the present invention, it is possible to prevent the bonded sheet itself from being damaged or broken. Furthermore, according to the present invention, since heat can be applied to the sheet for a necessary time, a situation in which the sheet is heated more than necessary can be avoided.

FIG. 1 is a block diagram illustrating the overall configuration of a splice device according to the first embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view showing a specific configuration and operation example of the splicing means. FIG. 3 is a diagram showing an example of the joining pattern of the splicing means. FIG. 4 is an explanatory diagram for explaining a second embodiment of the present invention. FIG. 4A shows a cross-sectional shape of the first joint portion 20a. FIG. 4B is a cross-sectional view taken along line YY ′ shown in FIG. FIG. 5 is an explanatory diagram for explaining a third embodiment of the present invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below, but includes those appropriately modified by those skilled in the art from the following embodiments.

(1. First embodiment of splicing device)
FIG. 1 is a block diagram illustrating an example of the overall configuration of a splice device 100 according to the first embodiment. As shown in FIG. 1, the splicing device 100 includes a first original roll 1a, a second original roll 2a, a splicing means 2, a cutting means 3, a tension control means 4, and a conveying means 5. It has.
The 1st original fabric roll 1a winds the 1st sheet | seat 10a.
The 2nd original fabric roll 1b winds the 2nd sheet | seat 10b.
The conveying means 5 is provided on the downstream side of each of the first original roll 1a and the second original roll 1b, and the first sheet 10a and the second sheet 10b from the original rolls 1a and 1b. Pull out and drive at a predetermined speed.
The cutting means 3 is provided on the downstream side of the conveying means 5, and cuts the used sheet when performing sheet splicing and switching the used sheet to an unused sheet.
The splicing means 2 is provided on the downstream side of the cutting means 3 and joins the first sheet 10a and the second sheet 10b fed out from the original fabric rolls 1a and 1b.
The tension control means 4 is provided on the downstream side of the splicing means 2 and controls the tension (tension) so that the traveling sheet does not loosen.
The splicing device 100 has guide rollers 6 at a plurality of locations. The guide roller 6 disposed at an appropriate position guides the traveling of the first sheet 10a, the second sheet 10b, and the joined body of both sheets drawn out by the conveying means 5.

(1-1. Raw roll)
The first original roll 1a and the second original roll 1b have a rotation shaft, and the first sheet 10a and the second sheet 10b are wound around the core of the rotation shaft, respectively, to form a roll. Is formed. The first original roll 1a and the second original roll 1b are supported by the bracket 12 so as not to contact each other. The bracket 12 that supports each of the original fabric rolls 1a and 1b is provided with an air brake so that the first sheet 10a and the second sheet 10b fed out from the original fabric rolls 1a and 1b travel at a predetermined speed. It has a brake function. As shown in FIG. 2, the first and second original rolls 1a and 1b are preferably rotated in the same direction, but the directions of the two original rolls 1a and 1b are mutually different. It may be in the opposite direction.

  The first sheet 10a wound around the first original fabric roll 1a and the second sheet 10b wound around the second original fabric roll 1b are respectively sheet bodies having thermoplasticity. Examples of the thermoplastic sheet body are a nonwoven fabric and a plastic sheet. It is preferable to use a nonwoven fabric in which fibers of thermoplastic resin such as low density polyethylene resin, ethylene vinyl acetate resin, synthetic rubber, copolymer polyamide resin, or copolymer polyester resin are knitted into a cloth shape. The non-woven fabric may be formed using any of the spunbond method, SMS method, SMMS method, air-through method, and airlaid method, for example. Such a nonwoven fabric is used, for example, as various sheet bodies forming a disposable diaper.

  It is preferable that a remaining amount detection unit 11 is provided on the bracket 12 that supports the original fabric rolls 1a and 1b. The remaining amount detection unit 11 detects the remaining amount of the first sheet 10a and the second sheet 10b wound around each of the original fabric rolls 1a and 1b. An example of the remaining amount detection unit 11 is an optical sensor. The optical sensor has a light emitting portion and a light receiving portion, and is provided, for example, at a position 5 mm from the core of each of the original fabric rolls 1a and 1b. The optical sensor outputs a detection signal for switching a winding unit to be used when detection light from the light emitting unit is detected by the light receiving unit. However, the remaining amount detection unit 11 is not limited to the optical sensor as long as it can detect the remaining amount of the sheet, and for example, various sensors such as a laser sensor, an area sensor, and an ultrasonic sensor can be used. Further, the remaining sheet amount detected by the remaining amount detection unit 11 is not particularly limited, and can be set as appropriate according to the application.

(1-2. Conveying means)
The conveying means 5 is located downstream of the first and second original fabric rolls 1a and 1b, and pulls out and conveys the first and second sheets 10a and 10b via the guide roller 6. The conveying roller 5 includes a driving roller 50 that is rotationally driven by a driving motor (not shown), and a nip roller 51 provided at a position facing the driving roller 50. The conveying unit 5 holds the first sheet 10a or the second sheet 10b between the driving roller 50 and the nip roller 51 and travels. The drive roller 50 is controlled to rotate at a predetermined speed, and sends the first sheet 10a or the second sheet 10b to the downstream side of the apparatus at a predetermined speed.

(1-3. Cutting means)
The cutting means 3 is located downstream of the conveying means 5 and has a first cutter 30a capable of cutting the first sheet 10a and a second cutter 30b capable of cutting the second sheet 10b. That is, the first cutter 30a is provided at a position along the feeding line of the first sheet 10a. Further, the second cutter 30b is provided at a position along the feeding line of the second sheet 10b. The first cutter 30a is connected to a first cutter driving mechanism 31a such as an air cylinder, for example, and can advance and retreat. When cutting the first sheet 10a, the first cutter 30a is advanced in the direction approaching the first sheet 10a by the first cutter driving mechanism 31a. Similarly, the second cutter 30b is also connected to a second cutter driving mechanism 31b such as an air cylinder, for example. When the second sheet 10b is cut, the second cutter 30b advances in a direction closer to the second sheet 10b. Be made.

(1-4. Splicing means)
The splice means 2 is located in the vicinity of the cutting means 3 and includes a first sheet 10a fed from the first original roll 1a, and a second sheet 10b drawn from the second original roll 1b. Heat is applied to and both sheets are joined. Examples of the splicing means 2 are a heat welding device and an ultrasonic welding device. The heat welding apparatus sandwiches the first sheet 10a and the second sheet 10b between a heat seal part having a heat source and a receiving part, and heats both the sheets 10a and 10b by heat generated from the heat seal part. This is an apparatus for melting and joining. Further, the ultrasonic welding apparatus sandwiches the first sheet 10a and the second sheet 10b between the sonic horn part that vibrates ultrasonically and the receiving part, and both the sheets 10a by ultrasonic vibration of the sonic horn part. , 10b is a device that applies frictional heat and melts and joins both sheets 10a, 10b. Known configurations can be adopted as appropriate for the configurations of the thermal welding apparatus and the ultrasonic vibration apparatus.

  As shown in FIG. 1, the splicing means 2 is provided along the first joining portion 20 a provided at a position along the supply line of the first sheet 10 a and the supply line of the second sheet 10 b. And a second joint portion 20b provided at a position. The first joint portion 20a and the second joint portion 20b are provided at positions facing each other. The first joint portion 20a is connected to a first reciprocating drive mechanism 25a such as an air cylinder, for example, and can advance and retreat in a direction close to the second joint portion 20b. Similarly, the second joint 20b is connected to a second reciprocating drive mechanism 25b such as an air cylinder, for example, and can advance and retreat in a direction close to the first joint 20a. The first joint portion 20a and the second joint portion 20b are moved in directions close to each other by the first reciprocating drive mechanism 25a and the second reciprocating drive mechanism 25b. Thereby, the 1st junction part 20a and the 2nd junction part 20b pinch the 1st sheet 10a and the 2nd sheet 10b between them. The 1st junction part 20a and the 2nd junction part 20b give heat to both sheets 10a and 10a in the state where both sheets 10a and 10b were pinched. For example, when a heat welding device is applied as the splice means 2, one of the first joint 20a and the second joint 20b functions as the heat seal part, and the other functions as a receiving part. In this case, both sheets 10a and 10a are sandwiched between the heated heat seal part and the receiving part, and the sheets are melted and joined. When a heat welding device is applied as the splicing means 2, one of the first joint portion 20a and the second joint portion 20b functions as a sonic horn portion, and the other functions as a receiving portion. In this case, both sheets 10a and 10a are sandwiched between a sonic horn that vibrates ultrasonically and the receiving part, frictional heat is generated in both sheets 10a and 10b, and the sheets are melted and joined.

  FIG. 2 is an enlarged cross-sectional view showing an example of the configuration of each part of the splice means 2 according to the first embodiment. As shown in FIG. 2, the first joint portion 20a includes a pattern block 27 having a joint region 21 for joining the sheet to the second joint portion 20b, a hood portion 22, and a biasing portion 23. , And a housing 28 in which these members are accommodated. The splicing means 2 may have a holding part 29. In the present embodiment, an example in which the pattern block 27 is provided in the first joint portion 20a will be described. However, the pattern block 27 is provided not in the first joint portion 20a but in the second joint portion 20b. It may be.

  In the pattern block 27, a plurality of convex portions 24 are formed in the joint region 21, and the plurality of convex portions 24 sandwich the first and second sheets 10a, 10b with the second joint portion 20b. To do. For example, when applying a heat welding device as the splicing means 2, the pattern block 27 may be heated to function as a heat seal portion. Moreover, the pattern block 27 may function as a receiving part of a heat welding apparatus. Further, when an ultrasonic welding apparatus is applied as the price means 20, the pattern block 27 can be caused to function as a sonic horn portion by ultrasonic vibration. Further, the pattern block 27 can be a receiving part of the sonic horn part. The pattern block 27 is preferably formed of a highly rigid metal material, for example.

  The hood portion 22 is erected around the joining region 21. The hood portion 22 has a protrusion 221 on the side opposite to the end on the side in contact with the seat. The protrusion 221 of the hood 22 slides along the slide groove 281 formed in the housing 28 around the pattern block 27 to a position where it abuts on the flange 282 formed in the housing 28. Thereby, the hood part 22 can be advanced and retracted in the direction in which the hood part 22 abuts on the second joint part 20b. That is, the hood part 22 can advance to a position protruding from the convex part 24 of the joining region 21 in the direction in contact with the sheet. Further, the hood portion 22 can be retracted to at least the same position as the convex portion 24 of the joining region 21 or a position where the convex portion 24 of the joining region 21 does not protrude.

  The urging portion 23 is disposed in a slide groove 281 formed in the housing 28, and is interposed between the inner surface step portion 283 of the housing and the protruding portion 221 of the hood portion 22. The urging portion 23 is formed of an elastic body such as a coil spring, for example, and urges the hood portion 22 in a direction close to the second joint portion 20b. The urging portion 23 urges the hood portion 22 so that the tip of the hood portion 22 protrudes from the convex portion 24 of the joining region 21 in a state where no pressure is applied to the hood portion 22. . On the other hand, when a certain pressure is applied to the hood portion 22, the urging portion 23 is compressed until the tip of the hood portion 22 is positioned so as not to protrude from the convex portion 24 of the joining region 21. The urging portion 23 may urge the hood portion 22 with a single member, or may urge the hood portion 22 with a plurality of members.

  The holding unit 29 holds the first sheet 10a and prevents the first sheet 10a from swinging when performing a splicing operation. The holding unit 29 may be configured, for example, with an intake structure that can suck outside air and adsorb the first sheet 10a.

  The second joint portion 20b may be configured to sandwich the first sheet 10a and the second sheet 10b with the first joint portion 20a and to apply heat to both sheets. A specific configuration is not limited. For example, when the pattern block 27 of the first joint portion 20a is heated to function as a heat seal portion, the contact surface of the second joint portion 20b may function as a receiving portion. In the case where the pattern block 27 of the first sheet 10a is made to function as a receiving part of the heat welding apparatus, the second bonding part 20b may be made to function as a heat seal part having a heat source. Further, when the pattern block 27 of the first joint portion 20a is vibrated ultrasonically to function as a sonic horn portion, the contact surface of the second joint portion 20b may function as a receiving portion. Furthermore, when the pattern block 27 of the first joint 20a is used as a receiving part of the ultrasonic welding apparatus, the second joint 20b may function as a sonic horn that vibrates ultrasonically. In addition, as shown in FIG. 2, the second bonding portion 20b preferably has a holding portion 29 for holding the second sheet 10b.

FIG. 3 shows an example of the pattern of the convex portions 24 formed in the joint area 21 of the pattern block. As shown in each drawing of FIG. 3, a hood portion 22 having a shape surrounding the bonding area 21 is disposed around the bonding area 21 of the pattern block.
3, the direction indicated by the arrow B in FIG. 3 (the vertical direction in the figure) coincides with the traveling direction of the sheet, and the direction indicated by the double arrow C in FIG. 3 (the horizontal direction in the figure) is It matches the width direction of the sheet.

  FIG. 3A shows an example in which the linear protrusions 24 extending in the sheet width direction are formed in a plurality of rows in the pattern block joining region 21. As shown in FIG. 3A, since the linear projections 24 are formed in a plurality of rows, the joining state of the first sheet 10a and the second sheet 10b becomes strong, so both sheets are conveyed. The situation of peeling inside can be avoided.

  FIG. 3B shows an example in which the linear protrusions 24 extending in the sheet flow direction are formed in a plurality of rows in the pattern block joining region 21. That is, the plurality of linear protrusions 24 are formed in parallel to the sheet flow direction. As shown in FIG. 3B, by forming the linear protrusions 24 in a plurality of rows, for example, compared with the pattern shown in FIG. 3A, the bonding pattern is continuous in the sheet width direction. No longer. If the joining pattern continues in the width direction of the sheet as in the pattern shown in FIG. 3A, the sheet is likely to break along the joining pattern after the sheets are welded. With this pattern, this situation can be avoided. Therefore, according to the joining pattern of FIG. 3B, it is possible to avoid a situation in which the first sheet 10a and the second sheet 10b break during conveyance of the sheet.

  FIG. 3C shows a pattern in which the circular dot-shaped convex portions 24 are formed in a plurality of rows along the sheet width direction and are formed in a plurality of columns along the sheet traveling direction. For example, in the example shown in FIG. 3C, the circular dot-shaped convex portions 24 are arranged in four rows along the sheet width direction, and are formed in six columns along the sheet traveling direction. ing. In the pattern shown in FIG. 3C, the plurality of convex portions 24 are in the form of circular dots formed at predetermined intervals in the traveling direction and the width direction of the sheet. For this reason, compared with the pattern shown in FIGS. 3A and 3B, for example, the contact area between the sheet and the convex portion 24 is reduced, so that the joined sheet is easily peeled from the pattern block. Further, since the pattern of the plurality of convex portions 24 is not connected in the width direction of the sheet, for example, it is possible to prevent a situation in which the joined sheet breaks along the joining portion in the conveyance process.

  FIG. 3D shows a pattern in which the cross-shaped convex portions 24 are formed in a plurality of rows along the sheet width direction and are formed in a plurality of columns along the sheet traveling direction. In this way, by providing a plurality of cruciform convex portions 24, the contact area between the convex portions 24 and the sheet can be achieved at each joining point while achieving joining with a slight length in the traveling direction and the width direction of the sheet. Can be reduced. That is, at each joining point, the sheets are joined to each other with a certain length in the traveling direction and the width direction, thereby strengthening the joining between the sheets. Further, by forming the convex portion 24 in a cross shape, the contact area between the convex portion 24 and the sheet is reduced as compared with, for example, the circular dodd-shaped convex portion 24 shown in FIG. The sheet becomes easy to peel from the pattern block.

In FIG. 3E, a frame-shaped convex portion 24a is formed along the periphery of the joint region 21 formed in a rectangular shape, and a cross-shaped convex portion 24b is formed in an inner region of the frame-shaped convex portion 24a. Is a pattern formed by a plurality of rows and a plurality of columns.
Normally, as shown in FIG. 3 (e), when the sheet-like protrusions 24a are formed and the sheets are joined to each other, the joined state of the sheets becomes strong, but the joined sheets adhere to the pattern block. It may be difficult to peel off. In this regard, in the present invention, as described above, the hood portion 22 for separating the sheet and the pattern block is provided around the bonding area 21 of the pattern block. For this reason, even if it forms the frame-shaped convex part 24a and it joins sheets, since the sheet | seat and a pattern block can be peeled reliably by the hood part 22, it says that the joined sheet | seat adheres to a pattern block. While solving the problem, strong bonding between sheets can be achieved. As shown in FIG. 3 (e), a mode in which a plurality of cross-shaped convex portions 24b are formed in the inner region of the frame-shaped convex portion 24a is a preferred mode, but the frame-shaped convex portion 24a is not necessarily formed. It is not necessary to form the cross-shaped convex part 24b in the inward region of.

(1-5. Tension control means)
The tension control means 4 is provided on the downstream side of the splicing means 2 and has a tension roller 40 for controlling the tension of the traveling sheet body and a rotating arm 41 having the tension roller 40 attached to one end. The tension control means 4 moves the tension roller 40 by rotating the rotation arm 41 in the direction of arrow A in FIG. 1 so that the traveling first sheet 10a and second sheet 10b do not become slack. , Hold the tension constant.
However, the position where the tension control device 4 is provided is not limited to the position shown in the present embodiment (downstream side of the splicing means 2). For example, the tension control device 4 may be located between the conveying roller 6 and the driving unit 5 that are located downstream of the first and second original fabric rolls 1a and 1b.

(2. Second embodiment of splicing device)
FIG. 4 is an explanatory diagram for explaining a splice device according to a second embodiment of the present invention. FIG. 4A shows a cross-sectional shape of the first joint portion 20a. FIG. 4B is a cross-sectional view taken along line YY ′ shown in FIG.

  In the second embodiment, as shown in FIGS. 4A and 4B, the first joint portion 20a has a pattern having a joint region 21 for joining the sheet to the second joint portion 20b. A plurality of blocks 27 are provided. That is, in the second embodiment, the bonding regions 21 are formed at a plurality of locations. A plurality of cross-shaped protrusions 24 are formed in each of the plurality of bonding regions 21, and the plurality of protrusions 24 are connected to the second bonding part 20 b by the first and second sheets 10 a, 10b is pinched. And the hood part 22 is formed so that it may stand in the circumference | surroundings of each of the some joining area | region 21. As shown in FIG. That is, the hood portion 22 includes a standing portion 222 that stands up around each of the plurality of joining regions 21 and a base portion 223 that is connected to the root end of the standing portion 222. The standing portion 222 has a shape surrounding each of the plurality of bonding regions 21, and is also erected between the plurality of bonding regions 21. In addition, a protrusion 221 is formed on the base 223 of the hood 22, and the protrusion 221 of the base 223 extends along a slide groove 281 formed in the housing 28 to a position where it contacts the flange 282. Slide. Thereby, the hood part 22 can advance until the front end of the standing part 222 reaches a position protruding from the convex part 24 of the joining region 21 in the direction in contact with the sheet. In addition, the hood part 22 can be retracted to the position where the tip of the standing part 222 is at least the same position as the convex part 24 of the joining area 21 or does not protrude from the convex part 24 of the joining area 21.

  The urging portion 23 is interposed between the housing 28 and the base portion 223 of the hood portion 22. The urging portion 23 is formed of an elastic body such as a coil spring, for example, and urges the base portion 223 of the hood portion 22 and urges the tip of the standing portion 222 in a direction close to the seat. The urging portion 23 has the base portion 223 so that the tip of the standing portion 222 of the hood portion 22 protrudes from the convex portion 24 of the joining region 21 in a state where no pressure is applied to the hood portion 22. Energized. On the other hand, when a certain pressure is applied to the hood portion 22, the urging portion 23 is compressed until the tip of the standing portion 222 of the hood portion 22 is positioned so as not to protrude from the convex portion 24 of the joining region 21. The The biasing portion 23 may bias the base portion 223 of the hood portion 22 with one member, or may bias the base portion 223 of the hood portion 22 with a plurality of members. .

  After the sheets are welded and joined by the standing part 222 of the hood part 22 being positioned around each of the plurality of joining regions 21 as in the above configuration, both sheets are joined by the hood part 22. Since the sheet 21 can be peeled off more quickly, the problem that the melted portion of the sheet does not dissociate while adhering to the bonding area 21 can be solved.

  In the second embodiment, the example in which one hood portion 22 is provided for the plurality of joining regions 21 has been described. However, for example, a plurality of hood portions 22 are provided for the plurality of joining regions 21. It is good.

(3. Third embodiment of splicing device)
FIG. 5 is a cross-sectional view showing a third embodiment of the present invention.
As shown in FIG. 5, in the third embodiment of the present invention, the hood portions 22a and 22b and the hood portions 22a and 22b are biased to both the first joint portion 20a and the second joint portion 20b. Biasing portions 23a and 23b are provided. That is, in the 1st junction part 20a, the 1st hood part 22a is formed in the circumference | surroundings of the 1st junction area | region 21a, and this 1st hood part 22a is 2nd joining by the 1st biasing part 23a. It is urged in the direction in contact with the portion 20b. On the other hand, in the 2nd junction part 20b, the 2nd food | hood part 22b is standingly arranged in the circumference | surroundings of the 2nd junction area | region 21b which the 1st junction area | region 21a of the 1st junction part 20a contact | abuts, The second hood portion 22b is urged by the second urging portion 23b in a direction in contact with the first joint portion 20a. As described above, the hood portion and the biasing portion may be provided not only around the first joining region of the first joining portion 20a but also around the second joining region of the second joining portion 20b. .

  The present invention is not necessarily limited to the form in which the hood portion and the urging portion are formed in the first joint portion 20a having the pattern block 27. For example, when the pattern block 27 is provided in the second joint portion 20b, the present invention forms the hood portion and the biasing portion in the first joint portion 20a where the pattern block 27 is not provided. There may be. That is, the hood portion and the urging portion may be provided in both the first joint portion 20a and the second joint portion 20b, or may be provided in only one of them.

(4. Splicing method)
Next, the splicing method executed by the splicing device 100 will be described. Here, for convenience of explanation, a method of joining the unused second sheet 10b to the first sheet 10a in use will be described.

  In a state where the remaining amount of the first sheet 10a wound around the first raw fabric roll 1a is sufficient, the first sheet 10a is pulled out by the conveying means 5, and the tension is controlled by the tension control unit 4. It travels while being fed to the production line downstream of the splicing device 100. At this time, the first cutter 30a, the second cutter 30b, the first joint portion 20a, and the second joint portion 20b are driven while being separated from the first sheet 10a and the second sheet 10b, respectively. Has stopped. Further, the starting end of the second sheet 10b is sucked and held by the holding portion 29 of the second bonding portion 20b.

  Here, when the remaining amount of the first sheet 10a wound around the first raw fabric roll 1a becomes equal to or less than a predetermined amount, the remaining amount detection unit 11 detects the state. When the remaining amount detecting unit 11 detects that the remaining amount of the first sheet 10a is equal to or less than a predetermined amount, the driving roller 50 of the conveying unit 5 stops the conveyance of the first sheet 10a.

  When the conveyance of the first sheet 10a is stopped, the splicing unit 2 performs a splicing process. Here, FIG. 2 shows an operation example of the splicing means 2 in the splicing process.

  As shown in FIG. 2A, in a normal state, the hood portion 22 of the first joint portion 20a is urged by the urging portion 23, and the front end of the hood portion 22 is protruded from the pattern block 27. It is in a position protruding from the tip of the portion 24.

  When the remaining amount detection unit 11 detects that the remaining amount of the first sheet 10a is equal to or less than a predetermined amount, as shown in FIG. 2B, the first bonding unit 20a and the second bonding unit The portions 20b are moved in directions close to each other by the first reciprocating drive mechanism 25a and the second reciprocating drive mechanism 25b, respectively. Then, when the first reciprocating drive mechanism 25a and the second reciprocating drive mechanism 25b start to move, power is supplied to the splicing means 2. For example, when a heat welding device is used as the splicing means 2, the heat source of the heat seal part is activated and the heat seal part is heated. For example, when an ultrasonic welding apparatus is used as a splicing means, ultrasonic vibration of the sonic horn unit is started.

  When the distance between the first joint portion 20a and the second joint portion 20b approaches, first, the tip of the hood portion 22 of the first joint portion 20a comes into contact with the first sheet 10a. As the distance between the first joint portion 20a and the second joint portion 20b approaches, the hood portion 22 relatively retracts while compressing the biasing portion 23, and the housing 28 of the first joint portion 20a. Is relatively advanced, and finally, the first joint 20a is located between the tip of the convex part 24 of the pattern block 27 and the contact surface of the second joint 20b. And 2nd sheet | seat 10a, 10b is clamped. Thereby, heat is applied to the first and second sheets 10a and 10b, and both the sheets 10a and 10b are melted and joined.

  After that, as shown in FIG. 2 (c), the first and second sheets 10a, 10a, 10b, a time sufficient for bonding (for example, 1 to 5 seconds) by the first bonding portion 20a and the second bonding portion 20b. After applying heat to 10b, the first joint 20a and the second joint 20b are moved away from each other by the first reciprocating drive mechanism 25a and the second reciprocating drive mechanism 25b, respectively. The Then, first, the compression of the urging portion 23 of the first joint portion 20a is released, and the hood portion 22 advances again in a direction in contact with the first seat 10a. For this reason, the hood part 22 peels off the adhesion between the tip of the convex part 24 of the pattern block 27 and the first sheet 10a.

  Thereafter, when the joining of the first sheet 10a and the second sheet 10b is completed, the first cutter 30a of the cutting means 3 located on the upstream side of the splicing means 2 is moved by the first cutter driving mechanism 31a to the first. The first sheet 10a is cut by moving in the direction in which the sheet 10a contacts. Thereby, the process of joining the second sheet 10b to the first sheet 10a is completed.

When the process of joining the second sheet 10b to the first sheet 10a is completed, the conveying means 5 pulls out the second sheet 10b from the second raw fabric roll 1b and causes the second sheet 10b to travel.
The starting end portion of the second sheet 10b is connected to the first sheet 10a and is conveyed downstream of the apparatus together with the remaining portion of the first sheet 10a. For this reason, after the supply of the first sheet 10a is completed, the second sheet 10b is continuously supplied to the production line.

  As described above, the present invention does not use an adhesive tape for joining the first sheet 10a and the second sheet 10b, and joins both the sheets 10a and 10b by heat welding or ultrasonic welding. An increase in the thickness of the joined sheets can be avoided, and damage to the conveying roller can be prevented. Further, since the adhesive tape is not used for joining the sheets, it is possible to prevent the joined sheet from adhering to other sheets. Further, it is not necessary to cut the adhesive tape to the required width and length and attach it to the tip of the connecting sheet. Furthermore, since there is no possibility that the adhesive tape will be mixed into the manufactured product as a foreign object, the non-defective product shipment rate can be improved.

  Further, for example, when the sheets are joined by heat welding, there is a possibility that the melted portion of the sheet may not be peeled off while being attached to the apparatus. However, in the present invention, the hood portion is provided around the joining region 21 where the sheet is joined by applying heat. Since 22 is provided, the sheet | seat after joining can be rapidly peeled from the apparatus by the food | hood part 22. FIG.

The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and those skilled in the art can make modifications and changes as appropriate from the above-described embodiments within the obvious range.
For example, the hood part 22 does not necessarily have to be provided so as to surround the entire periphery of the joining region 21. For example, a part of the hood part 22 is intermittent around the joining region 21. May be. That is, the hood portion 22 may be provided entirely or partially around the joining region 21.
Further, for example, the hood portion 22 may be provided only along a side orthogonal to the sheet flow direction of the joining region 21. That is, the hood portion 22 is not necessarily provided along the side of the joining region 21 in the sheet flow direction.

  Moreover, in the said embodiment, although the 1st junction part 20a and the 2nd junction part 20b demonstrated the example which moves to the direction which mutually adjoins, the 1st junction part 20a and the 2nd junction part 20b are as follows. It is good also as moving so that either one may adjoin to the other. That is, the present invention is not limited to the above embodiment, and as a result, the first sheet 10a and the second sheet 10b can be sandwiched between the first bonding part 20a and the second bonding part 20b. I just need it.

  The present invention relates to a splicing device and a splicing method used for joining a sheet of nonwoven fabric or plastic. For this reason, this invention can be utilized suitably in the manufacture industry of the product using a sheet | seat member.

DESCRIPTION OF SYMBOLS 1a 1st original fabric roll 1b 2nd original fabric roll 2 Splice means 3 Cutting means 4 Tension control means 5 Conveyance means 6 Guide roller 10a 1st sheet 10b 2nd sheet 11 Remaining amount detection part 12 Bracket 20a 1st Joint portion 20b second joint portion 21 joint region 22 hood portion 23 biasing portion 24 convex portion 25a first reciprocating drive mechanism 25b second reciprocating drive mechanism 27 pattern block 28 housing 29 holding portion 30a first cutter 30b Second cutter 31a First cutter drive mechanism 31b Second cutter drive mechanism 40 Tension roller 41 Rotating arm 50 Drive roller 51 Nip roller 100 Splice device

Claims (5)

A first material roll (1a) from which the first sheet is fed;
A second raw roll (1b) from which the second sheet is fed,
Splicing means (2) for joining the other sheet to one of the first sheet and the second sheet and performing sheet joining;
A splicing device comprising:
The splicing means (2)
A first joint (20a);
A second joint (20b) provided at a position facing the first joint (20a),
Heat is applied to both the first sheet and the second sheet in a state where both the first sheet and the second sheet are sandwiched between the first joint (20a) and the second joint (20b). The two sheets are welded together,
Either or either of the first joint (20a) and the second joint (20b)
A joining region (21) for applying heat to the sheets in the state where the sheets are sandwiched between the first joining part (20a) and the second joining part (20b);
Provided around the joining region (21), can be advanced to a position protruding from the joining region (21) in a direction contacting the both sheets, and at least the same position as the joining region (21) A hood part (22) that can be retreated to,
A splicing device including an urging portion (23) for urging the hood portion (22) in a direction in contact with both the sheets. The bonding region (21) formed in the first bonding portion has a plurality of convex portions (24),
The splicing device according to claim 1, wherein the plurality of convex portions (24) are formed in a plurality of rows along a traveling direction of both the first sheet and the second sheet. The plurality of convex portions (24)
The splicing device according to claim 2, wherein the first sheet and the second sheet are formed so as to form a plurality of rows along a direction orthogonal to a traveling direction of both sheets. Remaining amount detecting a said first of said wound in bulk roll (1a) a first sheet, and the second original fabric roll (1b) to the wound remaining amount of the second sheet A detector (11);
When the remaining amount detecting unit (11) detects that the remaining amount of the first sheet and the second sheet in use is equal to or less than a predetermined amount, the first joining is performed. Driving a reciprocating drive mechanism that moves both or one of the portion (20a) and the second joint portion (20b) in a direction to sandwich both the first sheet and the second sheet;
4. The first joint portion (20 a) and the second joint portion (20 b) are operated so that heat can be applied to the two sheets after the reciprocating drive mechanism is operated. 5. The splicing device described in 1. Of the first sheet fed out from the first original fabric roll (1a) and the second sheet fed out from the second original fabric roll (1b), unused sheets are used with respect to the used sheet. A splicing method for joining and joining sheets,
By applying heat to both the first sheet and the second sheet in a state where both the first sheet and the second sheet are sandwiched between the first joint (20a) and the second joint (20b). A splice process is performed to weld the two sheets together.
In the splicing process,
Hood part (22) provided around joint area (21) in both or any one of first joint part (20a) and second joint part (20b) that applies heat to both sheets In the direction of contact with both sheets to a position protruding from the joining region (21),
A step of sandwiching both the sheets by the first joint portion (20a) and the second joint portion (20b) while the hood portion (22) is in progress;
Retreating the hood (22) to at least the same position as the joining region (21);
A splicing method in which a step of applying heat to the two sheets is performed by the first joint portion (20a) and the second joint portion (20b).

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