JP2006218841A - Corrugated paper manufacturing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means of omitting the use of a heating panel, and eliminating fears producing scratches on a surface liner as a decoration corrugated board manufacturing apparatus. <P>SOLUTION: A surface liner preheating roll (B1) is arranged before (I) an alignment of pairs of slim crimping rolls gluing a surface liner sheet 11 and a single-sided corrugated board 4 together, a surface moistener (L1) is arranged further before it, the surface moistener (L1) is arranged before the preheating roll (B1), a core moistener (L2) between a core preheating roll (B2) and a tooth-shaped roll (C), a back liner moistener (L3) between a back liner preheating roll (B3) and a thick crimping roll (E), a single-sided corrugated board moistener (L4) between a single-sided corrugated board conveyer (F) and a second glue supply means (D2), and a single-sided corrugated board heating and humidifying steamer (L5) between the second glue supply means (D2) and the alignment of pairs of slim crimping rolls (I). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to an apparatus for producing a corrugated cardboard, particularly “decorative corrugated cardboard”, which is a relatively thin corrugated cardboard having printing or laminating on at least one surface.

A conventional corrugated cardboard manufacturing apparatus is composed of the following parts. That is,
A) means for feeding out the front liner paper, means for feeding out the core paper, and means for feeding out the back liner paper,
B) A front liner preheating roll that preheats the front liner paper, a core preheating roll that preheats the core paper, and a back liner preheating roll that preheats the back liner paper,
C) A set of tooth profile rolls for continuously forming a corrugated core from preheated core paper,
D) a first glue supply means for continuously applying glue to one top of the formed step of the core;
E) Large pressure bonding to form a single-sided cardboard paper called “single facer” by continuously bonding the core to which the glue is applied and the back liner paper on one of the tooth profile rolls. roll,
F) A single-sided cardboard paper conveyor for picking up and running the formed single-sided cardboard paper with a pair of endless belts arranged opposite to each other;
G) Stacking conveyor called “bridge” that temporarily stores the single-sided cardboard paper discharged from the single-sided cardboard paper conveyor to adjust the running speed;
H) a second paste supply means for continuously applying the paste to the other top of the corrugated pile of single-sided cardboard paper traveling out of the stacking conveyor;
I) Single-sided cardboard paper to which glue is applied and front liner paper are continuously bonded to form double-sided cardboard paper called “double backer”, and the applied glue is dried to A set of a heating plate and a canvas driven by a number of small crimping rolls and drive rolls and running along a number of small crimping rolls arranged to complete the pasting, and
J) Means for picking up the formed double-sided cardboard paper.

There is no limit to the demand for improvement in production efficiency, and it has always been required to realize a high line speed. Today, the highest volume A flute products are produced at a high speed of 250 m / min. However, in order to realize such high-speed production, it is necessary to preheat the paper and heat it with a hot platen. The main problem with the current technology is that a large amount of single-sided corrugated paper, which is a semi-finished product, is stored in the stacking conveyor described above, resulting in overdrying or warping. In addition, in the subsequent manufacturing process of the double-sided corrugated paper, the hot platen and the liner are rubbed, and the surface of the product corrugated paper is scratched.

Scratches on the product surface are called “decorative corrugated cardboard” and are fatal when printed or laminated on at least one surface. Since this type of product generally has a small core wave, that is, many thin ones, the demand for drying in the manufacturing process is more gradual than ordinary cardboard, and the added value is high. Even if it is not manufactured at a high speed, for example, 150 m / min.

The inventor has been involved in the improvement of corrugated cardboard manufacturing technology for many years, and during that time, he has developed and proposed several new technologies for promoting line speed and improving the quality of product corrugated paper. One of them is a technology that uses raw starch applied to the peak of the core as a paste by gelling as a heat source to reheat low-pressure steam to form high-temperature dry steam (Patent Document 1). 2), and the other is a technique (Patent Document 3) in which steam is sprayed on the core prior to application of the raw starch solution to humidify and heat. There is also a technique (patent document 4) for humidifying and heating the liner.
JP-B 59-15066 Japanese Patent Publication 3-65365 JP 4-74181 JP 6-11521

In these techniques, a device that performs humidification is called a “moisner”, and a device that performs heating (and some humidification) is called a “steamer”. Moisner is a glue that makes it easy to process corrugated core paper by applying normal, not too hot water vapor to the corrugated cardboard material in the manufacturing process, mainly to moisten it. It has a function of preventing rapid and large amount of moisture from being absorbed into the core. As the sizing agent, a dispersion in which starch (in many cases, corn starch) is dissolved in water is used, which is heated in the presence of appropriate water to gel and serves as a sizing agent.

At this time, if the core is dry and easily absorbs water, the applied paste will be absorbed into the core paper only in the portion in contact with the core. Insufficient moisture in the surroundings to produce proper glue. When an aqueous dispersion having a low starch concentration is used, the paste at a portion away from the center does not form a paste having sufficient adhesive strength even when heated. The moistness that Moisner imparts to the core eliminates this problem and allows it to turn into a glue with sufficient adhesion when a suitable starch concentration is applied.

On the other hand, the steamer is mainly intended to cause the heated paste to be heated and gelled by the action of heated slightly high-temperature steam. In the case of gelation, if only heat is applied, the surface of the paste applied to the top of the core core may dry and form a film, and may not exhibit adhesive strength. Heating by means of an increase in the humidity of the atmosphere due to water vapor and generation of moisture on the surface of the paste due to condensation makes it possible to avoid such problems in principle.

However, Moisner is a good steamer, both of which spray water vapor onto the surface of the paper, so by selecting the temperature and pressure of the water vapor, the temperature rise and humidity on the cardboard paper production paper One or both of the increases in the range can be brought about in a concentrated manner. Therefore, it should be understood that a Moisner and a steamer are devices that are named according to the intended effect, with respect to the subject used. By using these auxiliary devices, the production efficiency can be improved.

A general object of the present invention is to provide an apparatus for producing corrugated paper that eliminates the problems associated with the use of the hot platen by utilizing the above-mentioned auxiliary apparatus developed by the inventor. is there. More specifically, by eliminating the use of a hot platen, there was no risk of scratching the front liner, which is a problem especially in the manufacture of cosmetic cardboard, and surface processing such as arbitrary printing and embossing was performed. An object of the present invention is to provide a corrugated cardboard manufacturing apparatus that enables the use of a front liner and enables the manufacture of a product using a laminate of the front liner.

An apparatus for producing the corrugated paper of the present invention that achieves the above general object is shown in FIG. 1 as a whole, and in FIG.
Front liner paper feeding means (A1), core paper feeding means (A2) and back liner paper feeding means (A3),
The front liner preheating roll (B1) that preheats the front liner paper (11), the core preheating roll (B2) that preheats the core paper (21), and the back liner that preheats the back liner paper (31), respectively. Preheating roll (B3),
A pair of tooth rolls (C) for processing the preheated core paper (21) to continuously form the corrugated core (22),
First glue supply means (D1) for continuously applying the glue to one top of the step of the core (22),
A thick crimping roll (E) that forms a single-sided corrugated paper by continuously laminating the core (22) to which the paste is applied and the back liner paper (31) on one of the tooth profile rolls,
A pair of single-sided cardboard paper conveyors (F) that are picked up and run across the formed single-sided cardboard paper (4),
Second glue supply means (D2) for continuously applying glue to the other top of the corrugated corrugated cardboard paper,
The single-sided cardboard paper (4) to which the paste is applied and the front liner paper (11) are continuously pasted and maintained in the pasted state so that the pasting is completed during running. A pair of crimping rolls (I) in which a large number of pairs of thin crimping rolls are arranged, a set of canvases that are driven by a driving roll and run between a plurality of thin crimping rolls, and
Means (J) for taking up the formed double-sided cardboard paper (5) is an essential component,
Single-sided cardboard humidification between the central-core preheating roll (B2) and the tooth profile roll (C), between the central-humidification moisturizer (L2) and the single-sided cardboard paper conveyor (F) and the second paste supply means (D2). A moistener (L4) is placed, and a single-sided cardboard heating / humidification steamer (L5) is placed between the second paste supply means (D2) and a pair of crimping rolls (I) in which a number of pairs of thin crimping rolls are arranged. It is arranged.

Since the corrugated paperboard manufacturing apparatus of the present invention omits the use of a hot platen, various problems associated therewith are solved in principle. In other words, there is no risk of scratches on the surface liner, it is possible to use a surface liner that has been subjected to surface treatment such as printing or embossing, and it is also possible to use a surface liner that has been laminated. Therefore, it is particularly convenient for the production of cosmetic cardboard. Since the hot platen is removed and it is allowed to dry naturally, it is desirable to use as little glue as possible on the core steps. In conventional cardboard paper production, due to the above-mentioned problems, it is a reality that a larger amount of glue than necessary is applied, but according to the present invention, absorption of the applied glue by the water core is performed. As a result, the necessary adhesive strength can be obtained by applying the minimum amount of glue, and the amount of water to be removed in the drying process is reduced. Less.

The non-use of a heating plate restricts the drying speed of the formed double-sided cardboard paper. However, in the case of regular cosmetic cardboard, at least 100 m / min can be easily secured at a line speed, and in the preferred case 150 m / Min or more can be realized.

The preferred embodiment of the corrugated paper board manufacturing apparatus of the present invention has a back liner humidifying moistener (L3) between a back liner preheating roll (B3) and a thick press roll (E) as shown in detail in FIG. And a front liner humidifying moistener (L1) is provided before the front liner preheating roll (B1). These assist the function of the core humidification moistener (L2) and the single-sided cardboard humidification moistener (L4) that are in the basic mode, and the cardboard paper at a practical line speed despite the absence of a hot platen. Makes it possible to manufacture.

A preferred embodiment of a corrugated board manufacturing process using the apparatus of the present invention will be described below with reference to FIG. 2 and then FIG. As shown in FIG. 2, the core sheet is fed from the feeding means (A2) and is preheated around a core preheating roll (B2) that is set to a predetermined temperature by passing a heat medium through the inside. A predetermined surface temperature is obtained. Next, after being moistened by the center humidifying moisturizer (L2) and further being corrugated by being bitten by the pair of tooth profile rolls (C), the formed core (22) is a tooth profile roll. The glue is applied to the top of one of the steps by the first glue supply means (D1).

The back liner paper is fed out from the feeding means (A3) and comes into contact with the back liner preheating roll (B3). After the temperature reaches a predetermined surface temperature, the back liner humidified moistener (L3) is given moisture. It crimps | bonds with the thick crimping | compression-bonding roll (E) with respect to the center core (22) to which said paste was applied. The single-sided cardboard (4) formed in this way is drawn upward by a pair of single-sided cardboard conveyors (F) that are picked up and run across the cardboard. During this time, the glue that bonds the core to the back liner is removed a substantial part of its moisture by the heat that the paper retains.

The single-sided cardboard discharged from the single-sided cardboard conveyor (F) is replenished with moisture on the core side by the single-sided cardboard humidification moisturizer (L4), and then the second paste supply means (D2) A paste is applied to the top, and then heat and moisture are applied by a single-sided cardboard heating / humidification steamer (L5), and the paste is gelled. The dancer roll (M) provided between the single-sided cardboard humidification moisturizer (L4) and the single-sided cardboard heating / humidification steamer (L5) synchronizes the running speed of the single-sided cardboard and the front liner paper (11) to be bonded to it. To provide the necessary buffering action. Unless intended for extremely high speed operation, the cushioning function of this dancer roll does not need to have a function that allows a large amount of single-sided cardboard to be stored as the stacker conveyor of a conventional cardboard manufacturing apparatus.

On the other hand, the front liner paper (11) is fed from the front liner paper feed means (A1) and is moistened by the front liner humidification moisturizer (L1), and then a set of crimping rolls in which many pairs of thin crimping rolls are arranged. The single-sided cardboard is pasted together by (I) and a set of canvases (K) that are driven by a driving roll and run between a set of many thin crimping rolls. The double-sided corrugated cardboard (5) formed by the bonding is removed by the heat supplied by the single-sided cardboard heating / humidifying steamer while traveling, the adhesion is completed, and the pick-up means (J) takes it off. It is done.

In this corrugated cardboard manufacturing apparatus, a cutter (P) for cutting the double-sided cardboard paper to a fixed size, if desired, and a cut double-sided cardboard paper before the means (J) for picking up the formed double-sided cardboard paper A stacker (not shown) may be provided. However, in the case where a large number of the same cardboard boxes are manufactured, a facility for punching the manufactured double-sided cardboard paper in-line into a blank having a predetermined size and shape may be provided.

If you want to use the front liner paper that has been printed or embossed as desired, or laminated with any film or foil, the front liner paper feed means (A1) to the front liner humidifier moistener (L1) In the meantime, as shown in FIG. 1, an on-machine printing device (N1) and an embossing device (N2) may be provided, or a laminating device (not shown) may be provided. These devices can be combined as appropriate, or may be used in combination with another offline operation.

The corrugated cardboard manufacturing apparatus of the present invention has been described mainly in the case of decorative corrugated cardboard manufacturing, in which it is particularly meaningful. However, this apparatus is not limited to the one that has been subjected to printing or embossing as a front liner. Useful for the production of corrugated paper.

The side view which shows the whole structure of the cardboard manufacturing apparatus of this invention. The enlarged side view which shows the structure of the principal part about the preferable aspect of the apparatus of FIG.

Explanation of symbols

A1 Front liner paper feeding means A2 Center paper feeding means A3 Back liner paper feeding means B1 Front liner preheating roll B2 Center core preheating roll B3 Back liner preheating roll C Tooth profile roll pair D1 First glue supply means D2 Second Adhesive supply means E Thick crimp roll F Single-sided cardboard conveyor I A set of crimp rolls with many pairs of thin crimp rolls J Double-sided cardboard paper take-off means K Canvas L1 Front liner humidification moistener L2 Core humidification moistener L3 Back liner humidification moistener L4 Single-sided cardboard humidification moistener L5 Single-sided cardboard heating and humidification steamer M Dancer roll N1 On-machine printing device N2 Embossing device P Cutter / stacker 11 Front liner paper
21 Core paper 22 Core 31 Back liner paper 4 Single-sided cardboard 5 Double-sided cardboard

Claims (6)

An apparatus for producing corrugated paper,
A feeding means (A1) for the front liner paper (11), a feeding means (A2) for the core paper (21), and a feeding means (A3) for the back liner paper (31);
Of the fed sheets, a core preheating roll (B2) for preheating the core sheet (21) and a back liner preheating roll (B3) for preheating the back liner sheet (31),
A pair of tooth profile rolls (C) for continuously forming a core (22) obtained by processing the preheated core paper (21) into a corrugated shape,
First glue supply means (D1) for continuously applying glue on one top of the step of the core (22);
A thick crimping roll (E) for continuously bonding the core (22) coated with the paste and the back liner paper (31) on one of the pair of tooth rolls to form a single-sided cardboard paper,
A pair of single-sided cardboard paper conveyors (F) that are picked up and run across the formed single-sided cardboard paper (4);
A second glue supply means (D2) for continuously applying a glue to the other top of the corrugated mountain of the single-sided cardboard paper traveling;
The single-sided cardboard paper (4) coated with the paste and the front liner paper (11) are continuously pasted together, arranged to maintain the pasting state and complete the pasting during traveling, A pair of crimping rolls (I) in which a large number of pairs of thin crimping rolls are lined up, a canvas (K) driven by a double-sided corrugated paper take-up means (J) and running between the groups of many thin crimping rolls, and
Means (J) for taking up the formed double-sided cardboard paper (5) is an essential component,
Between the core preheating roll (B2) and the tooth profile roll pair (C), between the moisturizer (L2) for humidifying the core, the single-sided cardboard paper conveyor (F) and the second paste supply means (D2) A single-sided cardboard humidifying moistener (L4) is disposed, and a single-sided cardboard heating and humidifying steamer is disposed between the second paste supply means (D2) and a set of pressure-bonding rolls (I) in which a large number of pairs of thin pressure-bonding rolls are arranged. Corrugated paperboard manufacturing apparatus characterized by arranging (L5). A crimping roll in which a back liner humidifying moistener (L3) is provided between the back liner preheating roll (B3) and a thick crimping roll (E), and a large number of pairs of thin crimping rolls for bonding the front liner paper to one side cardboard. The corrugated board manufacturing apparatus according to claim 1, wherein a front liner humidifying moisturizer (L1) is provided before the set (I). The corrugated board manufacturing apparatus according to claim 1, wherein a dancer roll (M) is provided between the humidifying moistener and the accelerating steamer to synchronize the running speed of the single-sided cardboard and the supply speed of the front liner paper. 2. The corrugated board manufacturing apparatus according to claim 1, further comprising: a cutter (P) for cutting the double-sided cardboard paper into a fixed size; and a stacker for stacking the cut double-sided cardboard papers at the tip of the means for drawing the formed double-sided cardboard paper. 2. The corrugated cardboard manufacturing apparatus according to claim 1, wherein at least one of a group consisting of an on-machine printing device, an embossing device, and a laminating device is provided between the front liner paper feeding means (A1) and the front liner preheating roll (B1). . 6. The corrugated cardboard manufacturing apparatus according to claim 1, wherein the corrugated cardboard to be manufactured is a cosmetic cardboard.

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