JPH10305499A - Double facer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfactorily adhere a triple wall corrugated fiberboard sheet by substantially equivalently urging the sheet to a heating platen without depending upon a belt in the case of moving the sheet while heating to dry paste in a double facer, and upgrading air permeability of the sheet with the peripheral atmosphere. SOLUTION: An urging plate 36 supported to a support beam via a parallel linkage is urged by a spring 40 of a compressed state to urge a triple wall corrugated fiberboard sheet W to a heating platen 18. The sheet W is moved while being brought into slidable contact with the plate 36 and plate 18 to be heated and dried. A plurality of the plates 36 are aligned to form a lateral row in a width direction of the sheet, and a plurality of the lateral rows are also aligned in a longitudinal direction of the sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double facer, and more particularly to a technology of a pressing device for bonding a single-faced cardboard sheet and a liner.

[0002]

2. Description of the Related Art In general, in a double facer, a double-faced cardboard sheet is formed by gluing a single-faced corrugated cardboard sheet to the top of a corrugated sheet by a gluing device (not shown), laminating a liner, and moving the double-faced cardboard sheet on a hot platen. During this, the glue is heated together with the sheet, dried, solidified, and sent downstream. Here, by sending the double-faced corrugated cardboard sheet while pressing it against the hot plate, it is common to increase the efficiency of heat transfer from the hot plate to the double-faced corrugated cardboard sheet and to enhance the adhesive effect of the glue.

Conventionally, as the pressing mechanism, for example, FIG.
3 is known. The double-faced cardboard sheet W formed by the double facer 101 is
The sheet is conveyed in a substantially horizontal direction while the lower surface contacts the hot platen 102 and the upper surface contacts the canvas belt 103. At this time, the canvas belt 103 and the plurality of weight rolls 104
Is applied to the sheet W, and the sheet W moves while being pressed against the hot platen 102. According to this configuration, since the weight of the weight roll 104 is added to the weight of the canvas belt 103, a sufficient pressing force is applied to the sheet W, and the pressing force is diffused to some extent via the canvas belt 103.

[0004]

However, there is a difference in the pressing force between the middle portion and both end portions of each weight roll 103 having a length substantially corresponding to the width direction of the sheet W, and the pressing force is uniform in the width direction of the sheet W. There is a disadvantage that it is difficult to obtain a pressing force, and an excessively small or too small pressing force unfavorably affects the quality of the sheet W. Further, the canvas belt 103 that comes into contact with the sheet W is formed of a flexible material such as cotton so as not to damage the sheet, but the glue that has protruded from both edges of the sheet W adheres to the belt 103, and this paste is applied to the subsequent sheet. Trouble such as adhesion to the surface of W is likely to occur. In addition, the life of the canvas belt 103 is short, and replacement thereof is a troublesome operation, requiring considerable cost and labor, and lowering production efficiency.

In view of the function of the belt system,
Since the upper surface (upper liner) of the sheet W is covered with the belt 103, the air permeability is poor, and extra water is radiated from the sheet W, and moisture in the atmosphere is absorbed by the sheet W when over-dried. It is difficult. Therefore, there is a disadvantage that the humidity (moisture content) of the sheet W is too large or too small and is not stable.

Further, the belt 103 conveys the sheet, so that the belt itself is cooled in a cooling section or a return section of the belt located downstream of the double facer, and the sheet W is cooled in a hot platen section of the sheet carry-in section. Because of the contact, the heat on the upper side of the sheet W is easily absorbed, and the action of removing the heat therefrom and cooling the upper layer of the sheet W works. Therefore, for example, when producing a double wall (double-sided double-faced corrugated paperboard) WD as shown in FIG. 14, sufficient heat is not obtained in bonding the upper sheet S1 and the lower sheet S2, and it is difficult to bond them. There was a problem.

SUMMARY OF THE INVENTION An object of the present invention is to apply a proper pressing force to the entire area of a double-faced corrugated cardboard sheet to secure the adhesion, to stabilize the sheet humidity, to improve the adhesiveness of a double-faced double-faced cardboard sheet, Another object of the present invention is to provide a double facer which achieves easy maintenance.

[0008]

In order to solve the above problems, a double facer according to the present invention moves a double-faced corrugated sheet while contacting a hot plate, and moves the double-faced corrugated sheet to a double-faced cardboard sheet. And a plurality of pressing plate members for slidingly contacting the sheet in a planar manner while pressing the sheet against the hot platen.

According to the present invention, since there is no belt for pressing the double-sided corrugated cardboard sheet against the hot platen, problems such as adhesion of glue to the belt and replacement of the belt are eliminated, maintenance is easy, and production efficiency is increased. Also, since the upper surface of the double-faced cardboard sheet moving on the hot plate is not covered with the belt, the sheet can be ventilated between the pressing plate members or in a region where the pressing plate member is not disposed, and in the case of excessive humidity, it becomes extraneous. Water, and in the case of overdrying, it becomes easier to absorb atmospheric moisture. Therefore, the humidity (moisture content) of the double-faced cardboard sheet is further stabilized. Further, the belt does not have a cooling effect on the upper surface of the double-sided corrugated cardboard sheet, so that even when producing a double-sided double-faced corrugated cardboard sheet, the upper sheet and the lower sheet can be easily bonded.

[0010] In addition to the above configuration, if a plurality of pressing plate members are arranged at predetermined intervals in the width direction of the sheet and arranged so as to face the hot platen, a predetermined number of pressing plate members in the width direction of the double-faced corrugated cardboard sheet are provided. Since a plurality of pressing plate members adjacent to each other at intervals are in sliding contact with the double-faced corrugated cardboard sheet and press each of them in a planar manner, it is easy to make the pressing force uniform in the width direction of the sheet.

Further, if a through-hole penetrating itself in the thickness direction is formed in some or all of the plurality of pressing plate members, the double-faced corrugated cardboard sheet of the pressing plate member is formed through the through hole. The side that comes into contact with the side communicates with the opposite side,
The air permeability of the double-faced corrugated cardboard sheet to the surrounding atmosphere is further improved, and the movement of moisture between the sheet and the surrounding atmosphere is further facilitated.

Each pressing plate member is preferably supported so as to be in a floating state with respect to the hot platen, and is urged toward the double-faced cardboard sheet by an urging member such as a spring member. Therefore, if the spring force of each spring member can be changed, fine adjustment of the pressing force can be easily performed.

In a more specific embodiment, the plurality of pressing plate members are respectively connected to the supporting members in a suspended manner via pressing mechanisms such as a parallel link mechanism, and each pressing mechanism is arranged in a posture substantially parallel to the double-faced corrugated cardboard sheet. The two-sided corrugated cardboard sheet is supported so as to be able to approach and separate from the two-sided corrugated cardboard sheet, and is pressed against the two-sided corrugated cardboard sheet by an urging member such as a spring member provided in a compressed state between the supporting member and each pressing plate member. Can be Therefore, even if the thickness of the double-sided corrugated cardboard sheet varies or the thickness is changed by lot change, each pressing plate member always comes into sliding contact with the upper surface of the sheet in a parallel posture, and can perform a stable pressing function. .

As a preferred arrangement pattern, the plurality of pressing plate members are arranged adjacent to each other in the radial direction of the double-faced corrugated cardboard sheet to form a row, and the plural rows are formed in the moving direction of the double-faced cardboard sheet. At the same time, the pressing plate members in each row are arranged so that spaces between the pressing plate members in the front and rear adjacent rows are alternately formed.
With this configuration, there is no blank portion where the pressing force does not act on the double-faced corrugated cardboard sheet, so that a more uniform pressing force can be obtained in the width direction of the sheet.

[0015]

Embodiments of the present invention will be described below with reference to embodiments shown in the drawings. 1 and 2 schematically show the entire system of the double facer 1 of the present invention. The double facer 1 is formed by gluing a single-faced cardboard sheet fed from a single facer (not shown) by a gluing device (not shown) with a gluing device (not shown), laminating the liner to form an undried double-faced cardboard sheet, The paste is heated while being pressed by the fixing part 2 to dry the paste. As a device for moving (conveying) the sheet W, a belt-driven conveying unit 4 is provided downstream of the heating unit 2, and the sheet W is pulled by this.

The transport section 4 includes a lower belt conveyor 14 and an upper belt conveyor 16 with the sheet W interposed therebetween.
The sheet W is moved by the frictional force. Lower belt conveyor 1
Reference numeral 4 includes a driving roller 6 driven by a motor M, a driven roller 8, a belt tension adjusting roller 10, and a transport belt 12 stretched over these rollers. The belt 12 circulates in the direction of the arrow. The upper conveyor 16 has a similar configuration and operates in synchronization with the lower belt conveyor 14.

Belt 1 of both belt conveyors 14, 16
Reference numerals 2 and 12 are arranged so as to move in parallel with each other at opposing portions of the orbit. Sheet W is driven by rolls 6 and 6
And the belts 12, 12 made of a flexible sheet of rubber, cloth or the like, while being pinched by the driven rolls 8, 8 (and may not be pinched), and heated together with the movement of the belts 12, 12. It is continuously towed from the section 2 and is conveyed to the downstream side of the double facer 1 for use in a post-process such as a cutting process.

The heating unit 2 includes a well-known hot platen 1.
8 and a pressing mechanism 20 including a pressing plate 36.
The heating plate 18 is supplied with a heating medium such as steam, and heats and dries the sheet W by bringing the sheet W into contact with a heating surface 18a on the upper surface thereof. As shown in FIG. 2, the hot plates 18 are integrally formed in the radiating direction of the sheet W, and a plurality of the hot plates 18 are installed in parallel in the conveying direction of the sheet W. During the transfer, the plurality of heating surfaces 18a are continuously contacted to dry the glue.

The pressing plate 36 comes into sliding contact with the moving sheet W while allowing the sheet to be conveyed, presses it against the heating surface 18a of the hot platen 18, and makes the glued portion between the single-sided cardboard sheet and the liner adhere to each other. It enhances the heat transfer effect to dry and solidify the glue. As shown in FIGS. 2 and 3, the plurality of pressing plates 36 face the heating surface 18 a of the hot platen 18 from above in the heating unit 2.
The sheets are arranged adjacent to each other in the sheet width direction, and form one unit of rows, and a plurality of rows are provided in the sheet conveying direction. As is apparent from FIG. 2, the rows are alternately arranged so that the space between the pressing plates 36 adjacent in the horizontal direction (the gap 20a in this example) does not connect in a straight line in the sheet conveyance direction, and the sheet width is changed. A blank portion in which the pressing force does not act in the direction is prevented. The pressing plate 36 and the pressing mechanism 2
Numeral 0 denotes a support beam 24 that is laid at substantially right angles to frame members 22, 22 provided along the side edges of the hot platen 18.
Supported by

FIGS. 4 and 5 show the pressing mechanism 20 including the individual pressing plates 36. The above-mentioned support beam 24 functions as a support member for the pressing plate 36, and brackets 30, 30 are fixed to the support beam 24, and a pair of front arms 32, near the front end 30 a of the bracket 30, 32, and an upper end of a pair of linear rear arms 34, 34 near the rear end 30b.
Each is rotatably connected by a shaft 31. On the other hand, the lower ends of the arms 32 and 34 are rotatably connected to the pressing plate 36 by shafts 33 via brackets 37 fixed to the upper surface thereof. That is, the upper bracket 30, the arms 32 and 34, and the pressing plate 3
6 are provided, and two parallel link mechanisms are provided, one each for the right and left sides of the pressing plate 36. The pressing plate 36 is supported by the support beam 24 in a floating state with respect to the hot platen 18 by these parallel link mechanisms, and approaches the hot platen 18 while maintaining a posture substantially parallel to the heating surface 18 a of the hot platen 18. -Separable.

The pressing plate 36 is connected to the compression coil spring 4.
By 0, it is urged to the hot platen 18 side. In the pre-compressed state, the upper end of the spring 40 has a pair of brackets 30,
The support beam 24 is received by the support beam 24 via the upper spring receiving portion 40a at a substantially central position between the upper and lower portions 30, and the lower end is received by the lower spring receiving portion 40b near the center of gravity of the pressing plate 36, and the sheet W To the pressing force. When the above-described parallel link mechanism rotates, the compression coil spring 40 changes the angle in the axial direction or elastically curves to follow the rotation.

The upper ends 32 of the pair of front arms 32, 32
A stopper 42 is attached to a, and the stopper 42 comes into contact with the side surface of the support beam 24, so that the rotation of the front arm 32 and the rear arm 34 in one direction (clockwise in FIG. 4) is suppressed. An approach limit of the pressing plate 36 to the hot plate 18 side is defined. When the support beam 32 rises as described later, the stopper 42 works to secure a gap through which the sheet W passes between the hot platen 18 and the pressing plate 36. Also, at the movement limit of the pressing plate 36 defined by the stopper 42, the front arm 32,
As shown in FIG. 4, the rear arm 32 and the rear arms 34, 34 are pulled rearward in a tilted posture, and when the frictional force due to the sliding contact with the sheet W is applied to the pressing plate 36, this pushes the pressing plate 36 back. Acts in the direction. In other words, the adjustment is made so that the pressing plate 36 does not bite into the sheet W by the frictional force.

The pressing plate 36 is made of a metal such as iron, has a substantially flat plate shape, and is in surface contact with the sheet W.
The pressing force can be applied almost uniformly to the upper surface of the sheet W. Further, the front end portion 36a is curved upward so that even if the sheet W has uneven thickness or undulates, the sheet W can be overcome and the sheet W can be moved smoothly. The sliding surface (lower surface) of the pressing plate 36 with the sheet W is finished smoothly so that the coefficient of friction with the sheet W is reduced.

As shown in FIGS. 6 (a) and 6 (b), a plurality of (three in FIG. 6) through holes 38 are provided at the center in the width direction of each pressing plate 36 along the longitudinal direction. Is provided so as to pass through. The through hole 38 communicates the upper side and the lower side of the pressing plate 36 with each other, so that even when the pressing plate 36 is pressed against the sheet W, the air permeability between the sheet W and the upper space can be increased through the through hole 38. Secure.

In order to set the seat W on the double facer 1 as described above, as shown in FIG.
The support beams 24 are simultaneously raised, and the sheet W is guided to the gap between each pressing plate 36 and the hot platen 18 whose position is defined by the stopper 42. For raising and lowering the support beam 24, for example, as shown in FIG. 8, a cylinder 52 is attached to a bracket 50 fixed to the frame member 22,
The piston rod 54 of the cylinder 52 can be expanded and contracted by a pressure source 53 such as compressed air via a control valve 55, and the support beam 24 can be connected to the piston rod 54. If the support beam 24 is lowered to the set position while the sheet W is guided, the pressing plate 36 is pressed against the sheet W, and the parallel link mechanism rotates a predetermined angle in the flat direction, and the spring 40 further moves from the initial compression state. After a certain amount of compression, the stopper 42 is separated from the support beam 24.

Each of the pressing plates 36 having such a configuration is similar to that shown in FIG.
As described above, since the sheets W are pressed against the hot platen 18 independently of each other, even if the sheet W or the heating surface 18a has irregularities or a height difference, each pressing plate 36 follows this, and the generation of the unpressed portion and the pressing are performed. Deviation of the pressure distribution is suppressed.

As shown in FIG. 9, in the process of moving the sheet W downstream while being pressed against the hot platen 18, the sheet W can come into direct contact with the atmosphere through the spaces between the pressing plates 36, and When the sheet W is too dry under heating or when the sheet W is too dry under heating, the moisture between the surrounding atmosphere and the sheet W is absorbed, for example, by absorbing necessary moisture from the atmosphere. The movement becomes easy, and the humidity of the sheet W becomes more stable. Moreover, since the through holes 38 are formed in the pressing plate 36, the air permeability is further improved, and the above-mentioned exchange of moisture such as diffusion of steam is facilitated.

Further, as shown in FIG. 10, even in the case of producing a double corrugated cardboard sheet WD, since there is no belt for pressing, heat is hardly taken away from the upper sheet S1, and the upper sheet S1 and the lower sheet The glue joint of S2 is also effectively heated, and a favorable joint strength is easily obtained.

In the case where the distribution of the pressing force acting on the sheet W can be adjusted by individually changing the spring force of the spring 40 of the pressing plate 36, for example, an adjusting unit as shown in FIG. Can be provided for each pressing mechanism 20. That is, the adjusting screw shaft 62 is connected to the spring receiving portion 56 that receives the upper end of the spring 40, and the screw shaft 62 is connected to the support beam 24.
Screw holes 60. When the adjusting screw shaft 62 is advanced and retracted with the lock nut 63 loosened, the spring 40
, And the pressing force against the sheet can be individually changed.

Although the embodiment of the present invention has been described with reference to an embodiment, this is merely an example, and the present invention may be implemented in various modified forms based on the knowledge of those skilled in the art. Obviously you can get it.

For example, as shown in FIG. 12, an airbag 70 may be used to urge the pressing plate 36 toward the hot platen 18 instead of a compression coil spring. The airbag 70 is a flexible and sealed one, and is disposed between a support member such as the support beam 24 and the pressing plate 36, and a predetermined pressure medium such as compressed air is supplied to the inside of the airbag 70. The pressing plate 36 is elastically pressed in a state where the swelling is performed. By changing the supply pressure of the pressure medium, the urging force on the pressing plate 36 can be changed. The airbag 70 can be understood as a kind of air spring.

Further, the lower belt conveyor 14 in FIG. 1 can be replaced with a known suction conveyor (negative pressure suction belt conveyor), and the upper belt conveyor 16 can be eliminated.
Further, both the upper and lower conveyors may be suction conveyors (for example, reference numerals 72 and 73).

The through holes 38 of the pressing plate 36 shown in FIG. 6 can be provided in a scattered manner over the entire surface of the plate, or a single large through hole close to the plate radiation can be formed. Can also. Further, the shape of the through hole is arbitrary, and for example, the sheet W
It is also possible to form a single or a plurality of slits extending in a predetermined direction, such as a direction parallel to or perpendicular to the transport direction.

Further, as a mechanism for supporting the pressing plate in a floating state with respect to the hot platen, in addition to the parallel link mechanism, the pressing plate is supported via a linear sliding mechanism such as a vertical direction or an oblique direction. You may.

Although a plurality of press plates having a divided form adjacent to each other at a predetermined interval in the sheet width direction are shown, an integral press plate member continuous in the sheet width direction is used instead. You can also. In this case, if the pressing plate member corresponding to the width dimension of the sheet is made elastically deformable in the thickness direction, and if urging members such as spring members are provided at predetermined intervals in the width direction, the pressing plate member can be moved in the width direction of the sheet. , It is easy to obtain a uniform pressing force.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing an example of the entire configuration of a double facer of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is a front view thereof.

FIG. 4 is an enlarged side view showing an example of a pressing mechanism including a pressing plate.

FIG. 5 is a front view thereof.

FIG. 6 is a view showing an example of a through hole provided in a pressing plate.

FIG. 7 is a diagram illustrating a state in which a pressing plate is raised.

FIG. 8 is a schematic front view showing an example of a support beam elevating mechanism.

FIG. 9 is a conceptual explanatory diagram regarding air permeability between a double-faced corrugated cardboard sheet and a surrounding atmosphere.

FIG. 10 is a conceptual explanatory diagram showing an action on a double-sided double-faced cardboard sheet.

FIG. 11 is a side view showing an example of a mechanism for adjusting a spring force on the pressing plate.

FIG. 12 is a side view showing an example in which an airbag is used as urging means for the pressing plate.

FIG. 13 is a side view schematically showing a conventional double-facer pressing mechanism.

FIG. 14 is a schematic cross-sectional view illustrating a defect of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Double facer 2 Heating part 4 Conveying part 12 Conveying belt 14 Lower belt conveyor 16 Upper belt conveyor 18 Heating plate 20 Pressing mechanism 32 Front arm 34 Rear arm 36 Pressing plate 38 Through hole 40 Compression coil spring (biasing member)

Claims (7)

[Claims] In the process of manufacturing a double-sided corrugated cardboard sheet,
In a double facer for moving the double-sided corrugated cardboard sheet while making contact with the hot platen, the double facer is provided with a plurality of pressing plate members for slidingly contacting the double-sided corrugated cardboard sheet in a planar shape while pressing the sheet against the hot platen. And double facer. 2. The double facer according to claim 1, wherein the plurality of pressing plate members are adjacent to each other at a predetermined interval in a width direction of the sheet and are opposed to the hot platen. 3. A part of or all of the plurality of pressing plate members is formed with a through hole penetrating itself in the thickness direction, and both surfaces of the pressing plate member are formed through the through holes. The double facer according to claim 1 or 2, wherein a side contacting the corrugated cardboard sheet and a side opposite to the side communicate with each other. 4. The pressing plate member is supported in a floating state with respect to the hot platen, and is urged toward the double-faced cardboard sheet by an urging member. 4. The double facer according to any one of items 1 to 3. 5. A spring member is provided as an urging member for urging the plurality of pressing plate members toward the double-faced corrugated cardboard sheet, and a spring force of each spring member is changeable. The double facer according to 4. 6. The plurality of pressing plate members are respectively connected to the supporting member in a hanging manner via a pressing mechanism,
By a biasing member provided in a compressed state between the support member and each pressing plate member, each of the support members is supported so as to be able to approach and separate from the double-sided corrugated cardboard sheet while maintaining a posture substantially parallel to the double-sided corrugated cardboard sheet. The double facer according to any one of claims 1 to 5, wherein the double facer is pressed against a double-faced corrugated cardboard sheet. 7. The plurality of pressing plate members are arranged adjacent to each other in a width direction of the double-sided corrugated cardboard sheet to form a row, and a plurality of rows are formed in a moving direction of the double-sided corrugated cardboard sheet. 7. The pressing plate members of each row are arranged such that gaps between the pressing plate members of the adjacent rows in front and rear are alternately formed.
The double facer according to any one of the above.