JP6565058B2 - Double facer - Google Patents

Description

  The present invention relates to a double facer, and more particularly, to a double facer which is supplied with a single-sided cardboard sheet and a liner and bonds the single-sided cardboard sheet and the liner to create a double-faced cardboard sheet.

2. Description of the Related Art Conventionally, a double facer is known in which starch paste adhered to a single-sided cardboard sheet by heating with a hot platen is pasted, and a single-sided cardboard sheet and a liner (front liner) are bonded to create a double-sided cardboard sheet. In such a double facer, when a single-sided corrugated sheet and a liner (overlapped single-sided corrugated sheet and liner are used without distinguishing the single-sided corrugated sheet and the liner from each other, simply “corrugated sheet” Is sometimes provided with a weight roll that presses toward the surface of the hot platen (see, for example, Patent Documents 1 and 2).
In this double facer, in the bonding process, the single-sided cardboard sheet and the front liner are sandwiched between the transport belt and the heating plate and pressed by a weight roll disposed on the back side of the transport belt, so that it is necessary for bonding. Pressure is applied. Further, the corrugated cardboard sheet being bonded is pressed against the hot platen by pressing with a weight roll, so that heating of the corrugated cardboard sheet is promoted. Thus, the weight roll has a function of accelerating heating while applying a pressure necessary for bonding the corrugated cardboard sheet.

Japanese Patent Publication No. 7-8546 Japanese Utility Model Publication No. 2-46616

  In the conventional double facer as described above, the pressing by the weight roll toward the hot platen surface is performed at a certain position in the conveying direction of the cardboard sheet. Therefore, although the pressing by the weight roll to the hot platen surface is continuously performed during the production of the double-sided cardboard sheet, although it is in a state via the conveyance belt and the double-sided cardboard sheet, the heat pressed by the weight roll Part of the board surface was worn by friction with the cardboard sheet. In other words, a concave portion (a portion recessed downward) was partially formed on the surface of the hot platen.

When such a recess is formed on the surface of the hot platen, the following problem has occurred.
(1) Heat transfer from the surface of the hot platen to the corrugated cardboard sheet at the portion where the concave portion is formed becomes insufficient, causing insufficient heating, resulting in poor adhesion of the corrugated cardboard sheet.
(2) When it is going to avoid the adhesion failure of the corrugated cardboard sheets as described above, in order to secure the amount of heat transferred to the corrugated cardboard sheets, the production speed must be reduced, leading to a decrease in productivity.
(3) A foreign material such as glue or paper piece is clogged in the concave portion on the surface of the hot platen, and such a foreign material adheres to the surface of the corrugated cardboard sheet, thereby deteriorating the quality of the cardboard sheet.
(4) The concave portion formed on the surface of the hot platen shortens the usable period of the hot platen, leading to an increase in equipment costs and the like. For example, when a recess having a depth of about 0.1 mm is formed on the hot platen per year, a recess having a depth of about 1 mm will be formed on the hot plate in 10 years. When the recess is formed on the hot platen, the hot platen is treated as having expired.

  The present invention has been made to solve the above-described problems of the prior art, and provides a double facer capable of appropriately suppressing partial wear of the surface of a hot platen by pressing with a weight roll. With the goal.

In order to achieve the above object, the present invention is a double facer which is provided with a single-sided cardboard sheet and a liner, and bonds the single-sided cardboard sheet and the liner to create a double-sided cardboard sheet. A heating platen on which a sheet and a liner are placed and heated from below, a conveying belt that sandwiches and conveys the superimposed single-sided cardboard sheet and liner between the heated platen, and a superimposed single-sided cardboard sheet and liner and pressed from above through the transfer belt, possess a weight roll rotating with the movement of the conveyor belt, the weight roll, the longitudinal direction moving device which moves in the longitudinal direction along the conveying direction by the conveying belt, the , Further comprising a vertical movement device for moving the weight roll in the vertical direction perpendicular to the conveyance direction by the conveyance belt, The moving device is provided at both end portions in the length direction of the weight roll, rotatably supports the weight roll, and is configured to be movable in the front-rear direction, and the first support member is moved back and forth. And a forward / backward movement mechanism for moving the weight roll in the forward / backward direction, and the vertical movement device supports the first support member of the forward / backward movement device and is configured to be movable in the vertical direction. And a vertical movement mechanism that moves the second support member in the vertical direction and moves the weight roll in the vertical direction together with the first support member of the longitudinal movement device. It is characterized by that.

In the present invention configured as described above, the weight roll that presses the cardboard sheet via the transport belt is moved in the front-rear direction along the transport direction. The position on the heating plate pressed by can be changed. Thereby, it can avoid that the substantially same part of a heat disc is always pressed by a weight roll, As a result, it can suppress appropriately that a heat disc is partially abraded by the press by a weight roll. . That is, it can suppress appropriately that a recessed part is locally created in the hot platen surface.
According to the present invention as described above, it is possible to suppress a decrease in heat transfer from the surface of the hot platen to the corrugated board sheet due to partial wear of the hot platen. Therefore, it is possible to appropriately suppress the occurrence of poor adhesion between the single-sided cardboard sheet and the liner. Further, by suppressing such adhesion failure, it becomes possible to improve the productivity of the cardboard sheet.
In addition, according to the present invention, it is possible to suppress the formation of a recess on the surface of the hot platen, thereby preventing foreign matter such as glue or paper pieces clogged in the recess from adhering to the surface of the corrugated cardboard sheet. can do. Therefore, it becomes possible to produce a high quality cardboard sheet.
In addition, according to the present invention, the surface of the hot platen is suppressed from being partially worn, and the surface of the hot platen is uniformly worn, so that the hot platen can be used until replacement is necessary. The period can be lengthened. As a result, it is possible to suppress an increase in equipment costs and the like.
Further, in the present invention, the front-rear direction moving device supports the weight roll rotatably, the first support member is movable in the front-rear direction, and the front-rear direction movement mechanism moves the first support member in the front-rear direction. And the vertical movement device supports the first support member of the front-rear direction movement device, the second support member movable in the vertical direction, and the second support member moved in the vertical direction. Since the vertical movement mechanism is provided, the weight roll can be appropriately moved both in the front-rear direction and in the vertical direction.

In the present invention, the front-rear direction moving device preferably includes a motor that generates a driving force for moving the weight roll in the front-rear direction, and the weight roll is moved at predetermined intervals while the double facer is operating. It further has a control device for controlling the motor of the front-rear direction moving device so as to move the predetermined amount in the front-rear direction.
If the position of the weight roll in the front-rear direction is fixed as in the conventional double facer, the weight roll keeps pressing the same part of the hot platen. Since the cooling is performed as compared with other portions, non-uniform thermal deformation such as warpage of the hot platen may occur. On the other hand, according to the present invention, since the weight roll is moved in the front-rear direction by a predetermined amount every predetermined time while the double facer is operating, the hot platen pressed by the weight roll during the operation of the double facer. Because of this, the heat is removed only in a specific part on the hot platen and it is cooled compared to other parts. Can be suppressed. Therefore, heat can be uniformly transmitted to the cardboard sheet.

In the present invention, the front-rear direction moving device preferably includes a motor that generates a driving force for moving the weight roll in the front-rear direction, and continues the weight roll in the front-rear direction while the double facer is operating. And a control device for controlling the motor of the front-rear direction moving device so as to be moved.
According to the present invention configured as described above, since the weight roll is continuously moved in the front-rear direction while the double facer is operating, that is, the weight roll is constantly moved in the front-rear direction. It is possible to more effectively suppress non-uniform thermal deformation such as warpage of a hot plate, which is caused by heat being taken only at a specific portion and being cooled as compared with other portions.

In the present invention, the front-rear direction moving device preferably includes a motor that generates a driving force for moving the weight roll in the front-rear direction, and when the double facer is not operating, the weight roll is placed in the front-rear direction. It further has a control device for controlling the motor of the front-rear direction moving device so as to move it in a fixed amount.
According to the present invention configured as described above, when the double facer is not in operation (for example, when the double facer is turned on or off), the weight roll is moved by a predetermined amount in the front-rear direction. Thus, it is possible to suppress partial wear of the hot platen due to pressing by the weight roll.

In this invention, Preferably, it further has a sliding member provided between the 1st support member of the front-back direction moving apparatus and the 2nd support member of the up-down direction movement apparatus, The support member is slid by the sliding member and moves in the front-rear direction relative to the second support member of the vertical movement device.
According to the present invention configured as described above, the first support member of the front-rear direction moving device is slid by the sliding member, so that the second support member of the up-down direction movement device is moved in the front-rear direction. It is possible to move smoothly.

In the present invention, the front-rear direction moving device preferably includes a rack and pinion mechanism as a moving mechanism for moving the weight roll in the front-rear direction.
According to the present invention configured as described above, since the weight roll is moved in the front-rear direction using the rack and pinion mechanism, the position of the weight roll in the front-rear direction can be finely controlled. Can be reliably suppressed from being partially worn.

In the present invention, preferably, a plurality of weight rolls are provided, and the plurality of weight rolls are arranged along the transport direction, and the front-rear direction moving device integrally includes the plurality of weight rolls in the front-rear direction. Move.
According to the present invention configured as described above, since the plurality of weight rolls arranged along the transport direction are integrally moved in the front-rear direction, a plurality of weight rolls are pressed on the surface of the hot platen by pressing each of the plurality of weight rolls. It is possible to evenly wear the surface of the hot platen by suppressing the formation of the recess.

  According to the double facer of the present invention, it is possible to appropriately suppress that the surface of the hot platen is locally worn by pressing with the weight roll, in other words, that the concave portion is partially created on the surface of the hot platen. .

It is a side view which shows the double facer by embodiment of this invention. It is a side view which shows the weight roll, the heating board, etc. which the double facer by embodiment of this invention has. It is explanatory drawing of the front-back direction moving apparatus and vertical movement apparatus by embodiment of this invention, Comprising: It is sectional drawing seen along the III-III line in FIG. It is a control block diagram regarding control for moving the weight roll in the front-rear direction according to the embodiment of the present invention.

  Hereinafter, a double facer according to an embodiment of the present invention will be described with reference to the accompanying drawings.

<Device configuration>
First, with reference to FIG.1 and FIG.2, the whole structure of the double facer by embodiment of this invention is demonstrated. FIG. 1 is a side view showing a double facer according to an embodiment of the present invention, and FIG. 2 is a side view showing a weight roll, a heating plate, and the like of the double facer according to the embodiment of the present invention. More specifically, FIG. 1 shows a side view of a part of the upstream side in the transport direction of the double facer according to the embodiment of the present invention, and FIG. 2 shows the weight roll and the hot platen in the double facer according to the embodiment of the present invention. The side view which looked through seeing through a part of these weight rolls and a heat disc without the member which surrounds the circumference | surroundings is shown.

  As shown in FIG. 1, the double facer 1 is supplied with a single-sided cardboard sheet 2 and a liner 4 (front liner) before being bonded as a double-sided cardboard sheet. In this case, the single-sided corrugated cardboard sheet 2 is supplied to the double facer 1 from above with the starch paste applied to one side (specifically, the top of the corrugated core paper), and the liner 4 is lowered via the rollers 10a and 10b. To the double facer 1. Such a single-sided cardboard sheet 2 and the liner 4 are introduced into the double facer 1 by the conveyor belt 6 in a superposed state. The conveying belt 6 is stretched by a driven roller 8 and a driving roller (not shown; provided on the downstream side in the conveying direction A1), and is rotated by the driving roller to overlap the single-sided cardboard. The sheet 2 and the liner 4 are transported along the transport direction A1.

  Further, as shown in FIG. 2, the double facer 1 is provided on the surface side of the conveyor belt 6 (specifically, below the lower portion of the annular conveyor belt 6), and overlaps the single-sided cardboard sheet 2 and the liner. A heating plate 12 on which 4 is placed and heated from below, and a single-sided cardboard sheet 2 provided on the back side of the conveyor belt 6 (specifically, above the lower portion of the annular conveyor belt 6) and superimposed. And a weight roll 14 that presses the liner 4 from above via the conveyor belt 6 and rotates as the conveyor belt 6 moves. The conveyor belt 6, the heating platen 12, and the weight roll 14 extend in the width direction of the single-sided cardboard sheet 2 and the liner 4 (meaning a direction perpendicular to the paper surface, the same applies hereinafter), and the single-sided cardboard sheet 2 And a width that is at least longer than the length of the liner 4 in the width direction. Specifically, the hot platen 12 has a substantially flat plate shape, and the weight roll 14 has a substantially cylindrical shape. A plurality of hot plates 12 and weight rolls 14 are provided along the conveying direction A1.

  The single-sided corrugated cardboard sheet 2 and the liner 4 supplied to the double facer 1 as described above are sandwiched between the transport belt 6 and the heating platen 12 while being stacked, and are heated from below by the heating platen 12. Then, it is pressed from above by the weight roll 14 via the conveyor belt 6. In this case, the weight roll 14 functions to apply pressure necessary for bonding the single-sided corrugated cardboard sheet 2 and the liner 4 and promote heating by the hot platen 12.

  Further, as shown in FIG. 1, the double facer 1 includes a longitudinal movement device 18 for moving the weight roll 14 in the longitudinal direction A2 along the transport direction A1, and a weight roll in the vertical direction A3 perpendicular to the longitudinal direction A2. 14 and a vertical movement device 20 for moving (that is, raising and lowering) the vertical movement device 18. The front-rear direction moving device 18 includes a front-rear direction moving motor 18a that generates a driving force for moving the weight roll 14 in the front-rear direction A2. The vertical movement device 20 includes a vertical movement motor 20a that generates a driving force for moving the weight roll 14 and the like in the vertical direction A3, and a shaft 20b that transmits the driving force of the vertical movement motor 20a. And an up-down moving speed reducer 20c that decelerates the rotational speed corresponding to the driving force transmitted from the shaft 20b.

  With reference to FIG. 3, the front-back direction moving apparatus 18 and the up-down direction moving apparatus 20 by embodiment of this invention are demonstrated more concretely. 3 is a cross-sectional view taken along line III-III in FIG. In addition, about the weight roll 14, the front view is shown.

  As shown in FIG. 3, the front-rear direction moving device 18 includes a rack gear 18d that engages the driving force generated by the front-rear direction moving motor 18a supported by the motor support bracket 18b with the pinion gear 18c via the pinion gear 18c. This rack gear 18d is moved in the front-rear direction A2. As a result, the longitudinal movement frame 18f as a bearing connected to the rack gear 18d and provided at both end portions in the length direction (longitudinal direction) of the weight roll 14 to rotatably support the weight roll 14 is provided. Move in the front-rear direction A2. Thus, when the front-rear direction moving frame 18f moves in the front-rear direction A2, the weight roll 14 supported by the front-rear direction moving frame 18f moves in the front-rear direction A2. More specifically, the front / rear direction moving frame 18f extends along the transport direction A1 so as to rotatably support all of the plurality of weight rolls 14, and the front / rear direction moving frame 18f includes the front / rear direction moving frame 18f. All of the plurality of weight rolls 14 are integrally moved in the front-rear direction A2.

  Thus, the front-rear direction moving frame 18f corresponds to the “first support member” in the present invention. Hereinafter, the rack gear 18d and the pinion gear 18c are collectively referred to as a “rack and pinion mechanism 18e” as appropriate. The rack and pinion mechanism 18e corresponds to the “front-rear direction moving mechanism” in the present invention.

  On the other hand, as shown in FIG. 2, the vertical movement device 20 applies the driving force generated by the vertical movement motor 20a to the pinion gear (not shown) in the vertical movement reduction gear 20c via the shaft 20b. ) To the rack gear 20d engaged with the pinion gear, thereby moving the rack gear 20d in the vertical direction A3. The rack gear 20d has a vertical movement frame 20e connected to an upper portion thereof. The vertical movement frame 20e has a frame support bracket 20f fixed to the upper portion thereof, and the frame support bracket 20f is connected to the longitudinal movement device 18. The front / rear direction moving frame 18f is supported from below, and the motor support bracket 18b of the front / rear direction moving device 18 is fixed to the side surface.

  As a result, the rack gear 20d moves in the vertical direction A3 as described above, whereby the vertical movement frame 20e and the frame support bracket 20f move in the vertical direction A3 and are moved in the front-rear direction fixed to the frame support bracket 20f. The longitudinal movement frame 18f and the motor support bracket 18b of the device 18 are moved in the vertical direction A3. As a result, the weight roll 14 (including the longitudinal movement motor 18a and the rack and pinion mechanism 18e) moves in the vertical direction A3. More specifically, the vertical movement frame 20e and the frame support bracket 20f extend along the transport direction A1 so as to support the entire longitudinal movement frame 18f (see FIG. 1). By moving the vertical movement frame 20e and the frame support bracket 20f in the vertical direction A3, all of the plurality of weight rolls 14 are integrally moved in the vertical direction A3.

  Thus, the vertically moving frame 20e and the frame support bracket 20f correspond to the “second support member” in the present invention. The pinion gear (provided in the vertical movement reduction gear 20c) and the rack gear 20d of the vertical movement device 20 correspond to the “vertical movement mechanism” in the present invention.

  Further, as shown in FIG. 3, a slide plate configured to be slidable in the front-rear direction A2 between the front-rear direction moving frame 18f of the front-rear direction moving device 18 and the frame support bracket 20f of the up-down direction moving device 20. 22 is provided. As a result, the longitudinal movement frame 18f of the longitudinal movement device 18 moves in the longitudinal direction A2 relative to the frame support bracket 20f of the vertical movement device 20 by sliding with the slide plate 22. It becomes like this. That is, the longitudinal movement frame 18f of the longitudinal movement device 18 moves smoothly in the longitudinal direction A2 independently of the frame support bracket 20f of the vertical movement device 20. Such a slide plate 22 corresponds to a “sliding member” in the present invention.

  As described above, in the present embodiment, the weight roll 14 can be appropriately moved in both the front-rear direction A2 and the vertical direction A3 by the front-rear direction moving device 18 and the up-down direction moving device 20. That is, the weight roll 14 can be appropriately moved separately in each of the front-rear direction A2 and the up-down direction A3 (in other words, the movement in the front-rear direction A2 and the movement in the up-down direction A3 do not interfere with each other).

<Control configuration>
Next, with reference to FIG. 4, the control for moving the weight roll 14 in the front-rear direction A2 will be described. FIG. 4 is a control block diagram according to an embodiment of the present invention relating to such control.

  As shown in FIG. 4, in the present embodiment, the PLC (programmable logic controller) 30 controls the weight roll 14 to move in the front-rear direction A <b> 2, specifically, the front-rear direction moving motor of the front-rear direction moving device 18. Control for 18a is performed. The PLC 30 corresponds to a control device for controlling the double facer 1. The PLC 30 corresponds to a “control device” in the present invention.

  Specifically, the PLC 30 causes the weight roll 14 to perform a desired movement in the front-rear direction A2 (for example, to move to a desired front-rear direction position or to move at a desired front-rear direction moving speed). The servo amplifier 32 that drives the longitudinal movement motor 18a as a servo motor is controlled. In this case, the pulse encoder 34 detects the rotational state of the longitudinal movement motor 18a, and supplies this detection signal to the PLC 30, and the PLC 30 is based on the detection signal supplied from such a pulse encoder 34. The front-rear direction moving motor 18a is feedback-controlled through the servo amplifier 32. Thus, the rack-and-pinion mechanism 18e is driven by the longitudinal movement motor 18a by controlling the longitudinal movement motor 18a via the servo amplifier 32. As a result, the weight roll 14 performs a desired movement in the front-rear direction A2.

Next, a specific example of the control performed by the PLC 30 will be described.
(First control example)
In the first control example, the PLC 30 moves the weight roll 14 by a predetermined amount in the front-rear direction A2 when the double facer 1 is not in operation (meaning that the operation for manufacturing the double-faced cardboard sheet is not performed). In addition, the longitudinal movement motor 18 a is controlled via the servo amplifier 32. Specifically, the PLC 30 moves the weight roll 14 by a predetermined amount in the front-rear direction A2 when the power of the double facer 1 is turned on (that is, when the power is turned on and corresponds to the start of the operation of the double facer 1). To control. Thus, basically, the weight roll 14 moves in the front-rear direction A2 by a predetermined amount per day.

  Further, the PLC 30 moves the front and rear of the weight roll 14 by a distance of about 1/100 of the pitch of the adjacent weight rolls 14 so that the surface of the hot platen 12 is evenly worn when the power of the double facer 1 is turned on. Control is performed so as to move in the direction A2. For example, when the pitch of the adjacent weight rolls 14 is 100 mm, the PLC 30 performs control so that the weight rolls 14 are moved 1 mm in the front-rear direction A2. In that case, the PLC 30 further sets the maximum movement amount of the weight roll 14 in the front-rear direction A2 to 100 mm, and reciprocates the weight roll 14 in the front-rear direction A2, that is, moves 100 mm in one direction of the front-rear direction A2. After that, by moving 100 mm in the other direction of the front-rear direction A2, the weight roll 14 returns to the original position in 200 days.

  According to such a first control example, when the power of the double facer 1 is turned on, the weight roll 14 is moved by a predetermined amount in the front-rear direction A2, so that the weight roll 14 is moved in the front-rear direction A2 by a simple control configuration. Can be moved appropriately.

  Note that the amount of movement (1 mm) of the weight roll 14 in the front-rear direction A2 as described above is merely an example, and this amount of movement can be variously changed according to the parameters set in the PLC 30.

  In addition, when the power of the double facer 1 is turned on, it is not limited to moving the weight roll 14 in the front-rear direction A2 every time. In another example, the number of travel meters of the double facer 1 (of the corrugated cardboard sheet conveyed) The weight roll 14 may be moved in the front-rear direction A2 according to the total operation time. In that case, when the power of the double facer 1 is turned on, the weight roll 14 is moved in the front-rear direction A2 when the number of travel meters exceeds a predetermined value or when the total operating time exceeds a predetermined time. You can do it.

  Further, the weight roll 14 is not limited to moving in the front-rear direction A2 when the power of the double facer 1 is turned on. In other examples, when the power of the double facer 1 is turned off (strictly speaking, The weight roll 14 may be moved in the front-rear direction A2 when the double facer 1 power supply is completely turned off) or when the double facer 1 has stopped manufacturing the double-faced cardboard sheet.

(Second control example)
Next, in the second control example, the PLC 30 is operating while the double facer 1 is in operation (the double facer 1 is in operation, typically during the production of a double-faced cardboard sheet). The front and rear direction moving motor 18a is controlled via the servo amplifier 32 so that the weight roll 14 is moved in the front and rear direction A2 by a predetermined amount every predetermined time. For example, the PLC 30 controls the weight roll 14 to move in the front-rear direction A2 by 1 mm every 10 seconds while the double facer 1 is operating.

  Here, as in the conventional double facer, when the position of the weight roll 14 in the front-rear direction is fixed, the weight roll 14 continues to press the same portion of the hot platen 12, so that heat is always taken away at the pressed portion on the hot platen 12. In other words, heat transfer is performed, and the heat is cooled as compared with other portions. Therefore, uneven heat deformation such as warping of the hot platen 12 may occur. On the other hand, according to the second control example, while the double facer 1 is operating, the weight roll 14 is moved by a predetermined amount in the front-rear direction A2 every predetermined time. Accordingly, the portion of the hot platen 12 that is pressed by the weight roll 14 during the operation of the double facer 1 is changed. Therefore, according to the second control example, heat is taken only at a specific portion on the hot platen 12 and is cooled compared to other portions, resulting in non-uniform warpage of the hot platen 12 and the like. Thermal deformation can be appropriately suppressed.

  The period (10 seconds) and the amount of movement (1 mm) for moving the weight roll 14 in the front-rear direction A2 as described above are merely examples, and these periods and amounts of movement vary depending on the parameters set in the PLC 30. Can be changed to

  Further, it is not limited to moving the weight roll 14 in the front-rear direction A2 every predetermined time while the double facer 1 is operating. In another example, the weight roll 14 is continuously moved in the front-rear direction A2. It may be moved to. That is, while the double facer 1 is operating, the weight roll 14 may be continuously moved in the front-rear direction A2 at a predetermined speed (preferably relatively slow speed). By doing so, non-uniform thermal deformation such as warpage of the hot platen 12 caused by heat being taken only at a specific portion on the hot platen 12 and being cooled as compared with other portions is more effective. Can be suppressed.

  As described above, even when the weight roll 14 is moved in the front-rear direction A2 while the double facer 1 is operating, the weight roll 14 rotates so as to follow the movement of the transport belt 6. Therefore, the movement of the weight roll 14 in the front-rear direction A2 has little influence on the conveyance of the cardboard sheet. That is, it can be said that the resistance of the movement of the weight roll 14 in the front-rear direction A2 to the conveyance of the cardboard sheet is considerably small.

<Effect>
Next, the effect of the double facer 1 according to the embodiment of the present invention will be described.

  According to the double facer 1 according to the present embodiment, since the weight roll 14 is moved in the front-rear direction A2, the portion of the hot platen 12 pressed by the weight roll 14 is changed as the weight roll 14 moves. Can do. Thereby, it can suppress that the substantially same part of the hot platen 12 is always pressed by the weight roll 14, and, as a result, suppresses partial wear of the hot platen 12 by the press by the weight roll 14. can do. That is, it can suppress appropriately that a recessed part is locally created in the hot platen 12 surface.

  According to this embodiment, it is possible to suppress a decrease in heat transfer from the surface of the hot platen 12 to the corrugated board sheet due to partial wear of the hot platen 12. Therefore, it is possible to appropriately suppress the occurrence of poor adhesion of the corrugated cardboard sheet. Further, by suppressing such adhesion failure, it becomes possible to improve the productivity of the cardboard sheet.

  Moreover, according to this embodiment, since it can suppress that a recessed part is created in the hot platen 12 surface, foreign materials, such as glue and a paper piece with which such a recessed part was stuck, will adhere to the corrugated cardboard sheet surface. Can be suppressed. Therefore, it becomes possible to produce a high quality cardboard sheet.

  Moreover, according to this embodiment, since the surface of the hot platen 12 is suppressed from being partially worn, and the surface of the hot platen 12 is uniformly worn, the hot platen until replacement is necessary. Twelve usable periods can be lengthened. As a result, it is possible to suppress an increase in equipment costs and the like.

<Modification>
Next, a modification of the above embodiment will be described.

  In the above-described embodiment, the PLC 30 as the control device for the double facer 1 (see FIG. 4) performs control for moving the weight roll 14 in the front-rear direction A2. In another example, the corrugator including the double facer 1 is used. A management device that manages the whole may perform control for moving the weight roll 14 in the front-rear direction A2.

  In the above-described embodiment, the double facer 1 having a plurality of weight rolls 14 is shown (see FIG. 1 and the like), but the present invention is not limited to application to the double facer 1 having a plurality of weight rolls 14, and The present invention is also applicable to a double facer having one weight roll 14. In that case, only one weight roll 14 needs to be moved in the front-rear direction A2.

  In the above-described embodiment, basically, it is assumed that the weight roll 14 is moved in the front-rear direction A2 while being in contact with the back surface of the conveyor belt 6. However, in another example, instead of moving the weight roll 14 in the front-rear direction A2 in such a state that the weight roll 14 is in contact with the back surface of the transport belt 6, the weight roll 14 is once moved upward to You may move the weight roll 14 to the front-back direction A2 in the state spaced apart from the back surface.

In the above-described embodiment, the weight roll 14 is moved in the front-rear direction A2 via the front-rear direction moving frame 18f by the front-rear direction moving motor 18a and the rack and pinion mechanism 18e. The weight roll 14 may be moved in the front-rear direction A2 via the front-rear direction moving frame 18f by a cylinder such as a pneumatic cylinder or a hydraulic cylinder. However, when it is desired to finely control the position of the weight roll 14 in the front-rear direction, the weight roll 14 is moved by the front-rear direction movement motor 18a and the rack and pinion mechanism 18e shown in the above-described embodiment rather than such a cylinder. It is good.
Note that an induction motor such as a three-phase induction motor may be used as the longitudinal movement motor 18a instead of the servo motor.

  Further, in the above-described embodiment, the slide plate 22 as the sliding member is used to move the front / rear direction moving frame 18f in the front / rear direction A2 relative to the frame support bracket 20f. However, a roller guide such as an LM guide (registered trademark) may be used as long as it is a member that can relatively move the front-rear direction moving frame 18f in the front-rear direction A2. You may use the flat roller which a frame can roll on the roller row which was made.

DESCRIPTION OF SYMBOLS 1 Double facer 2 Single-sided corrugated sheet 4 Liner 6 Conveyor belt 12 Heating board 14 Weight roll 18 Front-rear direction moving device 18a Front-rear direction moving motor 18e Rack and pinion mechanism 18f Front-rear direction moving frame 20 Vertical direction moving device 20a Up-down direction moving motor 20d Rack gear 20e Vertical movement frame 20f Frame support bracket 22 Slide plate 30 PLC (programmable logic controller)

Claims (7)

A single face corrugated sheet and a liner are supplied, and a double facer for creating a double side corrugated sheet by adhering these single face corrugated sheet and liner,
A heated platen on which the one-sided corrugated cardboard sheet and the liner that are stacked are placed and heated from below;
A conveying belt that conveys the single-sided corrugated cardboard sheet and the liner that are overlapped with each other and the heating plate;
A weight roll that presses the superimposed single-sided cardboard sheet and the liner from above via the conveyor belt and rotates as the conveyor belt moves;
A front-rear direction moving device that moves the weight roll in the front-rear direction along the conveying direction by the conveying belt;
I have a,
Further comprising a vertical movement device for moving the weight roll in the vertical direction perpendicular to the conveyance direction by the conveyance belt;
The front-rear direction moving device includes a first support member that is provided at both end portions in the length direction of the weight roll, rotatably supports the weight roll, and is configured to be movable in the front-rear direction. And a front-rear direction moving mechanism for moving the weight roll in the front-rear direction by moving the support member in the front-rear direction,
The vertical movement device supports the first support member of the front / rear direction movement device, and moves the second support member in the vertical direction, the second support member configured to be movable in the vertical direction. And a vertical movement mechanism for moving the weight roll in the vertical direction together with the first support member of the longitudinal movement device . The front-rear direction moving device includes a motor that generates a driving force for moving the weight roll in the front-rear direction,
2. The double facer according to claim 1, further comprising a control device that controls a motor of the front-rear direction moving device so that the weight roll is moved a predetermined amount in the front-rear direction every predetermined time while the double facer is in operation. . The front-rear direction moving device includes a motor that generates a driving force for moving the weight roll in the front-rear direction,
2. The double facer according to claim 1, further comprising a control device that controls a motor of the front-rear direction moving device to continuously move the weight roll in the front-rear direction while the double facer is in operation. The front-rear direction moving device includes a motor that generates a driving force for moving the weight roll in the front-rear direction,
2. The double facer according to claim 1, further comprising a control device that controls a motor of the front-rear direction moving device to move the weight roll in a front-rear direction when the double facer is not operating. The sliding device further includes a sliding member provided between the first supporting member of the front-rear direction moving device and the second supporting member of the up-down direction moving device, 2. The double facer according to claim 1 , wherein the double facer is slid by the sliding member and moves in the front-rear direction relative to the second support member of the vertical movement device. The double facer according to any one of claims 1 to 5 , wherein the front-rear moving device includes a rack and pinion mechanism as a moving mechanism for moving the weight roll in the front-rear direction. A plurality of the weight rolls, and the plurality of weight rolls are arranged along the transport direction;
The double facer according to any one of claims 1 to 6 , wherein the front-rear direction moving device moves the plurality of weight rolls integrally in the front-rear direction.

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