JPH0760879A - Apparatus for producing corrugated cardboard - Google Patents

Abstract

PURPOSE:To divide a heating/bonding part and a feed/cooling part to respectively develop the functions of both parts by providing a heating part constituted of an endless belt transferring within the range covering a hot plate group and the hot plate group and a feed part having an independent transfer mechanism. CONSTITUTION:An endless belt 23 is arranged to the upper surface of the group of the hot plates 20 arranged on a line. A single-faced corrugated sheet of which the tip parts of corrugations are coated with a size and liner paper are introduced into the gap between the group of hot plates and the endless belt to be bonded while transferred. The sheet is fed by the feed part on and after the group of the hot plates 20 while cooling by air. In this corrugated cardboard producing apparatus, the endless belt 23 taking charge of transfer within the range covering only the group of the hot plates 20 without being extended to a feed part 28, the heating part constituted of the group of the hot plates 20, that is, a belt heater 26 and the feed part 28 having a transfer mechanism independent of the heating part 26 are provided. A heating device 26 is provided on the return side of the endless belt 23 and the cleaner device 24 of the belt 23 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated board manufacturing apparatus applied to a corrugated board manufacturing machine (hereinafter referred to as a corrugating machine), a cardboard, a hardboard manufacturing machine and the like.

[0002]

2. Description of the Related Art FIG. 3 shows a side view of a conventional corrugating machine. In a corrugating machine A1, a corrugation is formed on a core 2.
The liner 3 is glued to produce the A-stage. In the base paper rack 4, the core 2 or the liner 3 is supplied to the stage repeater A1. Also, in the stage repeater B5, the B single stage is similarly manufactured. The one-stage is sent to and heated by the heater 7 in the one-stage conveying unit 6, and the heated one-stage is pasted with the gluing machine 8 at the top of the stepped mountain, and the liner 3 and It is sent to the bonding / cooling unit 9 for bonding with each other. In the adhering / cooling section 9, five layers (or three layers) of ingress paper are pressure-bonded, glue as an adhesive is heated to gelatinize, and the fed web is pulled and conveyed, cooled, and dried. Its important role is to complete the bonding of each layer in the bonding part in the first half, cool the bonded web in the latter half, and cut it into products with the cutting / scoring machine 10 and the cutting machine 11 in the subsequent process. It plays the role of adjusting the conditions that allow processing for finishing. Next, the web that has been bonded and tempered as a corrugated board in the bonding / cooling unit 9 has slits for dividing it into a required width by the cutting / scoring machine 10 in the next step, and each of them is formed into a box. Sometimes creases are made for the necessary bends. The divided web is further cut by a cutting machine 11 in the next step.
Is cut into a required length to complete a corrugated cardboard sheet, and is piled up into a sheet pile 13 at the rearmost stacking portion 12 and is delivered as a product.

Next, details of the conventional bonding / cooling unit 9 are shown in FIG.
5, the upper belt 14 is driven by the upper belt drum 16 in order to feed one side and the liner glued with the corrugated cardboard web sandwiched between the heating belt 20 and the liner to the rear while applying pressure. In the adhesive part 18 in the first half, 10 to 20 heating plates 20 for heating are installed on the lower surface of the upper belt 14 and heated by steam. In addition, a plurality of pressure rolls 21 are suspended above the upper belt 14 above the respective heating plates 20, so that the web is pressed via the belts. In the cooling unit 19 in the latter half, the lower belt 15 for transporting the web is driven by the lower belt drum 17, and dozens of pressure rolls 21 are arranged above the lower belt 15 to arrange the lower belt 15 and the upper belt 14. It is configured to be sent out from the web in between.

[0004]

The basic functions of the bonding / cooling unit in such a conventional corrugating machine are, as described above, the three functions of bonding, conveying and cooling / drying. For adhesion, it is necessary to heat the water-soluble glue attached to the peaks of the terraces in order to gelatinize it, and at the same time, it is necessary to apply pressure for adhesion. Further, in order to produce a homogeneous and stable product, it is necessary to pull the corrugated cardboard web formed into three layers or five layers with a large force and feed it straight to the subsequent process without meandering and with minimum fluctuation in speed. is there. The corrugated board web hydrated at each step consequently contains a considerable amount of water. A large amount of water vapor is generated to heat the web, and the water vapor is sent out inside the fibers of the cardboard and in the space of the terrace, and as a result, the water vapor is generated during cutting, scoring and cutting in the subsequent process. Since a soft web containing it will be processed, the step formed by bending may be crushed or the adhesive part may be peeled off, resulting in defective products or it is necessary to take measures to slow down the production speed. there were. In spite of the complicated function of the bonding / cooling unit, in the structure of the conventional corrugating machine, as shown in FIG. 4, one upper belt 14 plays the main role of fulfilling the three functions. I was working. In the present invention, the drying belt which also functions as heating, pressurizing and adhering is used to eliminate the adverse effect of providing the above-mentioned conventional single upper belt 14 with multiple functions, thereby providing a sufficient temperature raising function and a pressurizing function. And have a drying function,
Moreover, instead of returning to the heating section once through the cooling section as in the past, it enables traveling a short distance, and the belt does not repeat heating and cooling cycles, achieving the purpose economically and efficiently. It is intended to provide a corrugated board manufacturing apparatus that can do the above.

[0005]

Therefore, according to the present invention, an endless belt is arranged on the upper surface of a heating plate group arranged on a line, and a single-faced corrugated sheet and a liner paper, which are glued on the top of the step, are provided between the two. In a corrugated board manufacturing apparatus having a configuration of introducing and adhering while transporting, and transporting the sheet while air-cooling in the transport unit after the hot plate group, in a range that covers only the hot plate group without extending to the transport unit. The heating section composed of the endless belt and the heating plate group that are in charge of transfer, and the heating section are composed of the transfer section having an independent transfer mechanism, and this is a means for solving the problem. is there. Further, according to the present invention, a heating device is attached to the return side of the endless belt, and a belt cleaner device is attached to the endless belt, and means for forcibly circulating air on the downstream side of the conveying section. And a device for forcibly cooling the sheet being transferred, which is a means for solving the problem. Further, the present invention comprises means for forcibly circulating air between the heating part and the transport part, and a device for forcibly cooling the sheet being transferred. It is a means for solution.

[0006]

The function of the present invention is to divide the function as much as possible, to improve efficiency and to stabilize quality, paste is applied to one step, and when the corrugated cardboard web is inserted from the entrance of the adhesive section at the same time as the liner, the web becomes It is sandwiched between the hot platen and the drying belt and sent to the rear. Then, the web is pressed by the weight of the pressure roll on the drying belt and heated by receiving heat from the hot platen, and the glue is heated to the gelatinization temperature to complete the adhesion. The water evaporated at this time is absorbed by the drying belt. On the other hand, a belt cleaner is installed on the return side to perform exhaust for cleaning the belt surface and removing water contained in the belt. Further, in the subsequent stage, a belt heater is provided in order to raise the temperature of the belt surface which has been lowered to improve the drying efficiency. Therefore, the length of the drying section can be shortened by omitting a part of the heating plate from the conventional machine.
Further, the apparatus of the present invention is provided with a carrying section for carrying, and the pressing force of the suspension type rubber roll can be adjusted by adjusting the air pressure, so that an appropriate carrying force can be obtained. The hot air and water vapor generated from the corrugated board web can be eliminated in the cooling section at the final stage to enhance the cooling / drying effect.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments of the drawings. FIG. 1 shows a first embodiment according to the present invention. In the figure, the adhesive portion 22 is composed of a heating plate 20, a drying belt 23 and a pressure roll 21, and a belt cleaner 24 is installed above the return side of the drying belt 23 to clean the surface of the belt. Is rotatably attached, and the upper part of the duct of the belt cleaner 24 is connected to a suction blower (not shown). Further, a belt heater 26 for heating the upper surface of the drying belt 23 is installed on the upper front side on the return side, and a heat source 27 is installed inside the belt heater 26. A pressure roll 21 is attached to the inside of the drying belt 23 to press the corrugated board web through the belt 23.

The transport unit 28 drives the upper pull belt 29 and the lower pull belt 30 independently or in conjunction with the drier 35 in order to send the corrugated cardboard web that has been heated, pressurized and bonded by the bonding unit 22 to the subsequent process. The suspension type rubber roll 31 for pressurization is provided on the inner lower surface of the upper pull belt 29, and the inner upper surface of the lower pull belt 30 is provided with
The receiving rolls 32 are aligned to support the pressure. Further, the suspension type rubber rolls 31 are provided with air cylinders (not shown) at both ends of the shafts so that the pressure can be adjusted and the lower limit position can be set according to the thickness of the web. There is. A cooling unit 33 is a vertical feed roll 34 driven to cool the corrugated board web.
The upper feed roll group can be adjusted and moved up and down in order to match the thickness of the conveyed web. Further, the entire cooling unit 33 is formed by a box-shaped air box 36, and has a structure in which the inside is roughly divided into front and rear, and each air chamber is sucked and exhausted by a blower to the operation side and the drive side. It has a structure that

As mentioned above, in the corrugated machine, 3
A mountain shape is formed on the center core of a 5-layer or 5-layer cardboard, and a corrugated cardboard web is formed by adhering it with a water-soluble starch paste, and after cutting, scoring and cutting in the subsequent process, it is stacked as a product. The raising work is consistently performed. The bonding / cooling unit 9 which plays an important role in the line has three functions of heating / pressurizing / bonding, conveying, cooling / dehumidifying. In the present invention, the function is divided as much as possible in order to improve the efficiency and stabilize the quality. When the corrugated cardboard web is inserted from the entrance of the adhesive section 22 at the same time as the liner is glued, the web is Is a heating plate 20 and a drying belt 23
It is sandwiched between and sent to the rear. Next, the weight of the pressure roll 21 on the drying belt 23 is applied, and the adhesive is heated to the gelatinization temperature by receiving heat from the heating plate 20 to complete the adhesion. The water evaporated at this time is absorbed by the drying belt 23. In this embodiment, unlike the conventional upper belt 14, the entire length is halved to the rear end of the drying section 22. Further, on the return side of the drying belt 23, there is provided a brush roll 25 for removing glue dripping adhering to the drying belt 23, paper waste generated at the time of order switching, and keeping the surface of the belt always in a good moisture absorbing state. A belt cleaner 24 having a device that rotates in a direction opposite to the traveling direction is installed, and exhausts air for cleaning the belt surface and removing water contained in the belt.

Further, the surface of the returning belt 23 is activated by the cleaner 24, and at the same time, the belt 23 is restored to the state in which the water absorption performance is enhanced. Further, in the subsequent stage, a belt heater 26 is provided to raise the lowered belt surface temperature. By doing so, it is possible to increase the drying efficiency, and a group of heating plates can be omitted from the conventional machine, so that the length of the drying section can be shortened by about 30 to 40%.
Further, conventionally, the corrugated cardboard web is pulled and conveyed by one upper belt 14 and one lower belt 15, but in the present embodiment, the conveying unit 28 is provided for the purpose of conveying, and the pressure of the suspension rubber roll 31 is controlled by air. Adjustable by adjusting the pressure,
It is configured so as to obtain an appropriate carrying force.
Since the conveying force in this case is generated by the frictional force of the upper pull belt 29, the lower pull belt 30 and the corrugated cardboard web, the frictional force is adjusted by the pressure of the suspension rubber roll 31. However, if excessive pressure is applied, the corrugated board web will be crushed (molded steps will be crushed and the product strength will be reduced). Therefore, depending on the thickness of the web to be conveyed, suspend it so that crushing is minimized. The lower limit position of the rubber roller 31 is set.
The cooling unit 33 is composed of a group of vertical drive rolls 34. A rubber roll is used to minimize the crushing of the web. Further, in order to adapt to the thickness of the web, the height of the upper feed roll can be adjusted to adjust the gap. It has a structure that can be performed. The cooling unit is a telescope type air box 36. For example, the air in the inlet half can discharge the internal air in the direction toward the operating side and the outlet half in the direction perpendicular to the drive side. It has a structure that eliminates water vapor and enhances cooling and drying effects.

Next, the embodiment of the present invention will be described in comparison with the prior art. In this embodiment, the number of the heating plates 20 serving as heat sources can be reduced by 30 to 40%, and the total length of the belt is halved. As a result, the cost of replacing an expensive belt with a new one can be reduced by half in terms of total cost. Further, since the upper belt 14 has a long length of 40 to 50 m in the past, it was manually joined by mechanical lacing in terms of the replacement mechanism and the woven fabric. By shortening, you will be adopting an endless belt, and there is no concern that racing marks will remain on the surface of the product. In the conventional example shown in FIG. 4, the upper belt drum 16 which is the drive pulley of the upper belt 14 is used only for driving the belt, but the belt driving dryer 35 in the bonding portion 22 of FIG. 1 according to the present embodiment. At the same time as the belt is driven, steam is passed inside the drum and the drying belt 2
3 has the role of performing heating and helping to disperse steam. In the case of the conventional machine, the upper belt drum 16 cannot be heated because it is attached to the cooling section, but the apparatus of this embodiment has a distributed function and can be used for heating the belt. The belt cleaner 24 is effective as an additional function even if it is attached to a conventional machine by itself. However, in order to keep the vapor emission effect of the belt moderately without lowering the temperature of the belt more than necessary, the belt is dried by the dryer 35. It is more effective to discharge the generated steam immediately after heating. Further, the brush roll 25 for cleaning the belt can exert the cleaning effect even if it is attached to the conventional machine.

In the conventional machine, the conveying section 28 in FIG. 1 was also used as a cooling section, but in the embodiment of the present invention, the pressure can be adjusted by an air cylinder so that the corrugated board web can be fed without meandering and speed fluctuation. We adopted a suspension type rubber roll. In addition, if the pressure is excessive, there is a problem that the molded terrace will be crushed.Therefore, instead of the conventional steel roll, a rubber roll is adopted, and at the same time, the pressure can be adjusted by air pressure to prevent the collapse of the terrace. In order to prevent crushing due to excessive pressure, the lower limit position of the rubber roll was adjusted according to the thickness of the web to minimize the deterioration of corrugated board quality due to crushing.

Since the cooling unit 33 has conventionally been used also as a carrying function (carrying the corrugated cardboard web between the upper belt 14 and the lower belt 15 shown in FIG. 4), the steam generated from the web is only absorbed by both belts. Therefore, the effect of cooling and vapor emission is small, and the corrugated cardboard web sent to the subsequent process in a wet state is subjected to cutting, scoring, and peeling where an adhesive portion is peeled off during cutting. In addition, if excessive pressure is applied in a wet state to convey the web, crushing of the steps occurs, and the product quality deteriorates. On the other hand, in the cooling unit of the present invention, since the rubber feed rolls 34 are only arranged above and below, heat radiation and vapor diffusion are also free, and the elasticity of the rubber and the upper feed roll 34 are adjusted according to the web thickness to obtain a gap. Since it is controllable, it is possible to prevent step collapse. Air box 36 divided into two chambers, front and rear, to further increase the cooling effect
The internal air is exhausted from each side, so the steam generated from the web and the steam trapped in the terraces are exhausted, and the cooling effect and the sufficient water removal effect are exhibited, and a dry, hard web is used. It will be sent to the process.
This improves productivity and stabilizes quality.

FIG. 2 shows the configuration of the second embodiment of the present invention.
The difference in configuration from the first embodiment of this example is that the belt heater 26 is eliminated in the adhesive section 22, the cooling section 33 is installed immediately after the drying section 22, and the transport section 28 is installed on the outlet side. is there. In the second embodiment, the adhesive portion 22 puts steam into the dryer 35, which is a drive pulley, as described above, so that the belt can be heated and the length of the belt is shortened. In some cases, no further heating is required. Since the web that has come out of the bonding section 22 has a high temperature and contains a lot of steam, the cooling section 33 is placed immediately after that,
By exhausting air and cooling, a dry state can be created as soon as possible, and since the transport unit 28 can pressurize and send the dried product in the cooling unit, the collapse of terraces can be prevented. Has an effect on.

[0015]

As described in detail above, according to the present invention, reliable adhesion by pressure and heating, which is important in corrugated board production, reliable cutting / scoring, cutting and stable quality by accurately transporting the web. It is possible to provide a system that exerts sufficient cooling / exhaust effects to make the total length of the device 30-
40% reduction, energy consumption reduction, product quality improvement, production speed improvement, and maintenance such as belt replacement can be facilitated.
Furthermore, since high-pressure steam is used, the weight of the heating plate group, which has a heavy structure, is reduced, and the transport unit and cooling unit can also have a light structure, which contributes to a significant reduction in the overall machine length. The cost can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a corrugating machine according to a first embodiment of the present invention.

FIG. 2 is a side view of a corrugating machine according to a second embodiment of the present invention.

FIG. 3 is a side view of a conventional corrugating machine.

FIG. 4 is a side view of a dry cooling unit in a conventional corrugating machine.

[Explanation of Codes] 20 Hot Plate 21 Pressurizing Roll 22 Adhesive Section 23 Drying Belt 24 Belt Cleaner 25 Brush Roll 26 Belt Heater 27 Heat Source 28 Conveying Section 29 Upper Pull Belt 30 Lower Pull Belt 31 Suspended Rubber Roll 32 Receiving Roll 33 Cooling Section 34 Feed Roll 35 Dryer 36 Air Box

Claims (4)

[Claims] 1. An endless belt is arranged on the upper surface of a heating plate group arranged on a line, and a single-faced corrugated sheet and a liner paper, which are glued to the top of the step, are introduced between them to bond them while transferring them. In a corrugated board manufacturing apparatus configured to convey the sheet while air-cooling it in a conveyance unit after the plate group, an endless belt and a heat plate group that are in charge of transferring the heat plate group without extending to the conveyance unit. A corrugated board manufacturing apparatus, characterized in that it comprises a heating unit configured and a transporting unit having a separate transfer mechanism. 2. The corrugated board manufacturing apparatus according to claim 1, wherein a heating device is attached to the return side of the endless belt, and a belt cleaner device is attached. 3. A means for forcibly circulating air on the downstream side of the conveying section, and a device for forcibly cooling the sheet being conveyed.
Or the corrugated board manufacturing apparatus described in 2. 4. The apparatus according to claim 1, further comprising means for forcibly circulating air between the heating section and the transport section, and a device for forcibly cooling the sheet being transferred. The corrugated board manufacturing apparatus described in 2.