JP6205962B2 - Method and apparatus for producing corrugated paper - Google Patents

Description

The present invention relates to improvements in corrugated paper manufacturing technology, and can maintain a high line speed for corrugated paper manufacture, and can always obtain a product with stable quality even if the line speed fluctuates greatly. It relates to a manufacturing method that can be used. The invention also relates to an apparatus used to carry out the method. The present invention can be applied to the production of both double-sided corrugated paper and double-sided corrugated paper, but the latter is also suitable for the production of double-sided corrugated paper having a reinforced core using reinforced paper as a core base paper. When applied, it is particularly significant.

As is well known, corrugated paper is manufactured by first corrugating the core base paper and then bonding it to the back liner paper to prepare a single-sided corrugated paper, and then attaching the front liner paper to it. To do. The obtained product is a double-sided corrugated paper, and there are various standards including A flute (hereinafter referred to as “AF”) and B flute (hereinafter referred to as “BF”) depending on the thickness and the size of the corrugated sheet. The double-sided corrugated paper is typically manufactured by a process in which AF and BF are overlapped, and a front liner is overlapped and bonded and integrated on the top of the BF.

Currently, a liquid in which starch is dispersed in water is used exclusively as a paste material. In terms of adhesion with starch glue, there is relatively little problem with respect to the production of double-sided corrugated paper, or with respect to the stage of producing AF and BF even with double-sided corrugated paper, but prior to the process of overlaying them with the front liner. The degree of preheating by the preheater and the application of the glue material in the glue machine, especially the adjustment of the coating amount and the degree of heating by spraying water vapor on the applied glue material are important factors. These factors are highly dependent on the material used to manufacture the corrugated paper.

In order to increase the efficiency of bonding, whether to manufacture double-sided corrugated paper, double-sided corrugated paper, AF or BF, or both, before entering a gluing device called "glue machine" The temperature is raised by bringing it into contact with a heating roll called “(pre) heater”, and the paste material applied to the top of the corrugate is heated by blowing low-pressure superheated steam from the “steamer” to make it semi-gelatinized. Has been done. The superposed and integrated liner with AF or AF + BF is then fed onto a heater called a “hot platen”. From there, the load from the “weight roll” is applied to the integrated one via the canvas belt, pressing it against the hot platen. If it is slid in that state, it is heated in the meantime to complete the gelatinization of the paste material and dried to produce a double-sided cardboard paper or a double-sided cardboard paper product.

First, the applicant invented a device that reheats low-pressure steam and spouts it as high-temperature dry steam as a steamer that gives heat from steam to the corrugated paper production material, and named it “Accelerated Steamer”. Patent Document 1). The water vapor pressure in this apparatus is 0.1 to 0.3 kg / cm ² , and the temperature after reheating is 105 to 130 ° C. On the other hand, when the core was manufactured with reinforced paper often used for double-sided corrugated paper, the problem was that the penetration was slow when the paste was applied to the top of the corrugated paper. Also proposed heating and humidifying by spraying water vapor (Patent Document 2). In this case, the water vapor pressure is 0.2 to 0.3 kg / cm ² and the temperature is 105 to 130 ° C. Subsequently, the applicant developed an improved type of accelerated steamer in which a plurality of, typically three, steam spraying means are arranged in the flow direction during the production of corrugated paper, which is also disclosed (Patent Document 3). ). This steam spraying means has a pipe through which high-pressure steam passes in the middle of a hollow tube having a number of nozzles on the upper surface, and separates an upper header chamber and a lower header chamber, and a steam passage is formed between the two chambers. It is a structure to contact.

In the process of making corrugated paper, the warpage that often occurs in a product includes “upward warp”, that is, warpage in which both edges of the product corrugated cardboard face upward, and “downward warp” in the opposite direction. Phenomenologically, when the line speed is low, the warp tends to occur, and when it is high, the warp tends to occur. This is because the heating by the hot platen is performed only from one side (from below). The moisture of the glue material for bonding the front liner to the top of the single-sided cardboard is When the line speed is low, heat is generated to evaporate the moisture, and the back liner contracts and warps, causing the back liner to elongate. As the speed increases, there is no room for moisture to evaporate, and the back liner stretches and warps downward. In any case, the cause of the warp is the uneven moisture content of the bonded material.

Therefore, the applicant has developed a means “moisner” for spraying low-temperature water vapor for the purpose of giving a balance to the material with lower moisture prior to bonding. In order to correct the uneven moisture content of the material, water spray is often performed. However, when water vapor is blown by a Moisner, the moisture content is low, but the penetration is faster and the material stretches more quickly. It is effective. In this way, the Moisner that gives moisture to the material in the corrugated paper manufacturing process, and the steamer that gives water and increases the temperature, when used in addition to existing corrugated paper manufacturing equipment, warps, Since it contributed significantly to improving product quality, such as washing board and prevention of cracking of ruled lines, it has been widely accepted by the corrugated paper manufacturing industry and used in large numbers.
Japanese Patent Publication No.59-15066 (Japanese Patent No. 1448335) Japanese Patent Publication No. 04-74181 (Japanese Patent No. 1794833) Japanese Patent Publication No. 03-65265 (Patent No. 1701204)

In the production of corrugated paper, the line speed is remarkably improved, and today, high speeds of up to 400 m / min or more have been realized. On the other hand, in relation to box making, which is the main application of corrugated paper, for example, polypropylene tape is affixed to freshly produced corrugated paper for the purpose of reinforcing the final product box or for the convenience of opening. Often attached. At the start of tape application or pasting, it is often necessary to slow down the running speed of the corrugated paper being manufactured over a period of time. However, this variation in line speed often affects the quality of product corrugated paper. The main reason is that the heating by the pre-heater described above is strengthened by a decrease in line speed and the material becomes excessively hot, and the degree of material shrinkage varies depending on the heating temperature. Affects quality.

A means to counter the excessively high temperature of the material is to have a large amount of moisture that takes heat away, which is achieved by using a large amount of glue material. Therefore, it is often performed to apply an amount of the paste material that is larger than that required for bonding. However, applying a large amount of glue material and a large amount of heat necessary to evaporate the water therein is a major problem for corrugated paper and makes it difficult to avoid warping. Warping is a problem caused by the balance of moisture content between the bonded materials. Therefore, if the moisture is insufficient, the warp will be temporarily prevented if it is supplemented with a moderate amount of moisture from the Moisner. Can be avoided. However, giving or removing excess moisture has a fatal adverse effect on corrugated paper made from paper. For example, when the product is folded, the outer liner tears, so-called “ruled cracks” are likely to occur. The application of a large amount of glue also causes the so-called “washboard” phenomenon, ie the liner falls between the steps and the corrugated surface becomes wavy like a washboard.

Thus, the application of a large amount of glue material and the application of a large amount of heat not only incurs waste of materials and energy, but also makes it difficult to produce a corrugated paper product without warping. By the way, in the manufacture of corrugated paper, an important problem in addition to warping is adhesion. In the past, from the viewpoint of complete adhesion, a large amount of paste material was applied anyway, and it took time to dry the paste, so it was necessary to suppress the line speed. However, the bonding realized by applying a large amount of heat to a large amount of glue is so-called “surface bonding”. What should be aimed at is “penetration adhesion”, that is, a more complete adhesion in which the paste is sufficiently infiltrated into the base paper.

When producing double-sided corrugated paper, plain paper is often used for the core base paper and the front liner, and the normal paper has a rapid penetration of the paste material, so that initial bonding is important. In normal operation, the temperature of both the top of the single-sided cardboard and the front liner is heated to 90 to 100 ° C. When using reinforced paper as the core base paper, the K liner is often used as the front liner, and the reinforced paper has a slow penetration of the paste, so if the amount of paste is small, it will gelatinize before penetration. Therefore, the adhesion is a surface adhesion, and as a result, the adhesion is insufficient, and it is peeled off with a creaking noise. In order to prevent this, an operation is performed in which the amount of the paste material is increased by osmotic adhesion, but the temperature of the paste material is about 35 to 38 ° C. (the gelatinization temperature is said to be about 56 to 63 ° C.). Therefore, by applying it, the temperature of the bonded portion is estimated to be 60 to 70 ° C. from the above 90 to 100 ° C. Anyway, there is no problem because osmotic bonding is realized, but since it takes time to dry, a decrease in the bonding speed is unavoidable.

On the other hand, a problem in producing double-sided corrugated paper is the adhesion between AF single-sided cardboard and BF single-sided cardboard. The reason is that BF single-sided corrugated paper is in an intermediate position between the AF single-sided corrugated paper and the front liner, so that heat from the hot platen is not easily transmitted in the integrated finishing process. Therefore, it is necessary to raise the temperature of the liner of BF single-sided corrugated paper to about 85 to 90 ° C. before applying the paste material.

Through these various studies, the inventor found that the amount of moisture given to the material was reduced as much as possible, that is, using as little paste as possible, contrary to the conventional practice that has become common knowledge. It is the royal road to produce corrugated paper that can achieve close to ideal bonding, suppress warping, and withstand frequent and large line speed fluctuations by applying the amount of heat that does not reach the limit. I came to think. In order to solve the problem, making the best use of the functions of the Moisner and the steamer is another matter that the inventor has made.

The basic object of the present invention is to embody the above-mentioned idea of the inventor, to use as little paste material as possible, and to allow the paste material to work by applying a heat amount that does not become excessive, thereby , Which minimizes defects such as warping that occur in corrugated paper, gives product corrugated paper with less quality fluctuations due to the effects of line speed fluctuations, and minimizes material and energy consumption Another object of the present invention is to provide an improved method for producing corrugated paper. It is also an object of the present invention to provide an apparatus for producing corrugated paper for carrying out this improved production method.

A specific object of the present invention is to provide a base paper for cores in relation to the technology for producing double-sided corrugated paper, in which the problems caused by the addition of a large amount of water and the application of heat are particularly serious in the process of producing corrugated paper. Whether the paper is plain paper or reinforced paper, it is advantageous to provide an improved method for producing corrugated paper, regardless of the difference, and to provide a production apparatus for carrying out the method. is there.

A method for producing a corrugated paper that achieves the basic object of the present invention is a method for producing a double-sided corrugated paper, and includes the following steps:
A) corrugating the core core paper, and manufacturing the single-sided cardboard by pasting the molded core with the back liner;
B) The temperature of the produced single-sided cardboard is increased by bringing it into contact with a pre-heater roll, if necessary, and preheating, or after being replenished with moisture by a moistener and then heated in contact with the heater roll. Enhancing,
C) Applying a glue material in which starch is dispersed in water in a glue machine to the top of the core of single-sided cardboard,
D) The paste material is semi-gelatinized by spraying steam from the steamer on the applied paste material and heating it.
E) If necessary, increase the temperature by bringing the front liner into contact with the pre-heater roll and preheating it, or increasing the temperature by heating the surface liner in contact with the heater roll after replenishing moisture with a moistener. ,
F) On the front liner, the above single-sided cardboard is superposed and integrated, and G) the integrated one is supplied onto a heating plate composed of at least three groups maintained at different heating temperatures. By using a group of rolls including weight rolls, press against a heating plate via a canvas belt and heat, fully paste the paste that has been semi-gelatinized, proceed with adhesion, and dry.
In the manufacturing method with the basic process,
1) When heating the single-sided cardboard and liner in contact with the heater roll or preheater roll and the heater roll, the temperature of the heat medium introduced into these rolls is adjusted, and the contact angle with the roll is adjusted to adjust the single-sided cardboard and liner. Adjust the top of the corrugated cardboard corrugation to 60 ± 10 ° C and the liner to 50 ± 10 ° C.
2) Minimize the amount of glue applied on the glue machine,
3) Divide the heating plates arranged in series into three groups, and increase the temperature of each group gradually in the order of low → medium → high along the direction of travel, and keep those temperatures within the range of 140-180 ℃ And setting so that there is a difference of at least 20 ° C., and
4) Operate with the number of weight rolls set so that the number of weight rolls increases later.
Is a manufacturing method characterized by

Here, the word “top temperature” of the core is used, and this is the temperature obtained when measured from the center side of the moving single-sided cardboard using a non-contact type thermometer. Therefore, the measured temperature is nothing but the average value of the temperature of a certain region having a certain spread including the top and bottom. Applying the paste material is the top, and the temperature of the part is a problem. On the other hand, the “liner temperature” is a flat one, so there is no problem like a core, but it is still moving using a non-contact type thermometer. The average value of the temperature in a certain area of the liner paper is no different from single-sided cardboard.

A method for producing a corrugated paper that achieves the specific object of the present invention is a method for producing a double-sided corrugated paper, and includes the following steps:
A ₁ ) A flute single-sided cardboard is produced by step-forming base paper for A-core and bonding the formed A-core to a back liner;
A ₂ ) Forming a B flute single-sided cardboard at the same time by step-forming a B-core base paper and bonding the formed B-core to a back liner;
B ₁ ) The manufactured A flute single-sided cardboard is preheated by bringing it into contact with a preheater roll, if necessary, and the temperature is increased, or the water is replenished with a Moisner and then brought into contact with the heater roll and heated. To increase the temperature by
B ₂ ) If necessary, heat the B flute single-sided corrugated cardboard in contact with a preheater roll to increase the temperature, or supply water with a Moisner and heat it in contact with the preheater. To increase the temperature at the same time,
C ₁ ) Applying a glue material in which starch is dispersed in water in a glue machine on the top of the center of the A flute single-sided cardboard,
C ₂ ) simultaneously applying a glue material in which starch is dispersed in water in a glue machine to the top of the core of the B flute single-sided cardboard,
D ₁ ) A glue is applied to the top of the core of the flute single-sided corrugated cardboard by spraying steam from a steamer and heating the paste to make it semi-gelatinized,
D ₂ ) Simultaneously carrying out heating by spraying water vapor from a steamer on the glue material applied to the top of the core of the B flute single-sided corrugated cardboard,
E) If necessary, increase the temperature by bringing the front liner into contact with the pre-heater roll and preheating it, or increasing the temperature by heating the surface liner in contact with the heater roll after replenishing moisture with a moistener. ,
F) On the front liner, the B flute single-sided cardboard and the A flute single-sided cardboard described above are overlapped and integrated, and G) heat of at least three groups maintained at different heating temperatures. Supply to the board, press against the heating board with a roll group including a plurality of weight rolls, heat, completely paste the semi-gelatinized glue material, advance the adhesion, and dry.
In the manufacturing method with the basic process,
1) When heating the A flute single-sided cardboard, the B flute single-sided cardboard and the liner in contact with the preheater roll and the heater roll, the temperature of the heat medium introduced into these rolls and the contact angle with the roll are adjusted. The top of the corrugated corrugated A flute corrugated board is adjusted to 60 ± 10 ° C, the liner of the B flute corrugated cardboard is adjusted to 90 ± 5 ° C, and the liner is adjusted to 50 ± 10 ° C.
2) Minimize the amount of glue applied on the glue machine,
3) Divide the heating plates arranged in series into three groups, and increase the temperature of each group gradually in the order of low → medium → high along the direction of travel, and keep those temperatures within the range of 140-180 ℃ And setting so that there is a difference of at least 20 ° C., and
4) Operate with the number of weight rolls set so that the number of weight rolls increases later.
Is a manufacturing method characterized by

Here, “B flute”, which is called “A flute”, is a word representatively representing two types of flute, as easily understood. As is well known to those skilled in the art, there are some flute standards other than A and B, but this is not intended to exclude them, and in some cases, the case where A and B are the same flute is also included. The

When the production method of the present invention is used, the minimum amount of glue material is used for adhesion, so the amount of heat to be applied to evaporate the moisture contained in the glue material is also minimal. In short, this is a low glue amount-low heat amount operation that realizes an operation at a lower temperature than the conventional one and a reduction in the amount of water that enters and leaves the cardboard paper material. As a result, whether or not double-sided corrugated paper is produced, or when producing double-sided corrugated paper, the ability equivalent to 85 to 90% of the maximum capacity of the corrugated paper production apparatus is to be exhibited. Can do. Even if the line speed fluctuates significantly, the difference in the amount of heat that enters and exits per unit time is small, so that it is possible to obtain an excellent product with little warping in principle.

Because of the low glue amount-low heat amount processing, there is minimal distortion in the product, so not only the cardboard paper manufacturing process, but also the warpage during storage is reduced. Naturally, the fact that the amount of glue used and the amount of heat to be applied is also minimal contributes to the reduction of materials and energy consumed.

The method for producing corrugated paper according to the present invention is based on the technical idea of operation with a small amount of paste and a low amount of heat as described above, whether it achieves a basic purpose or a specific purpose. Operation. This is in contrast to the conventional method for producing corrugated paper, which is a multi-glue-high-heat operation. It becomes possible to minimize.

The apparatus of the present invention used for carrying out the above-mentioned corrugated paper manufacturing method is an apparatus that achieves the basic object.
a) an apparatus for producing single-sided cardboard, comprising: means for step-forming a core sheet; and means for bonding the formed core to a back liner;
b) A preheater roll provided as necessary for preheating the manufactured single-sided cardboard, a moistener for humidifying by spraying low temperature steam, and a series of heater rolls for heating,
c) A glue machine for applying a paste material in which starch is dispersed in water to the top of the core of a humidified and heated single-sided cardboard,
d) a steamer for spraying water vapor onto the glue applied to the top of the core of the single-sided cardboard to make it semi-gelatinized,
e) A series of pre-heater rolls, if necessary, for preheating the front liner paper, a moistener for humidifying by spraying low temperature steam, and a heater roll for heating,
f) A pair of rolls for stacking and integrating the single-sided cardboard on the front liner paper,
g) a heating plate for heating the integrated front liner and single-sided cardboard, which are arranged in series and can be controlled in at least three groups, and h) at the top of the heating plate A group of a number of rolls and weight rolls for heating and drying and corrugating corrugated paper comprising a single-sided corrugated cardboard and a front liner;
In an apparatus composed of
1) The preheater roll and the heater roll can be adjusted to 60 ± 10 ° C for the top of the corrugated corrugated board on one side, and 50 ± 10 ° C for the liner.
2) The gap between the application roll and the doctor roll of the glue machine can be set to a minimum of 0.08 mm over the entire length, and
3) The temperature of the three groups of heating plates is set so that the temperature gradually increases in the order of low → medium → high along the traveling direction, and there is a difference of at least 20 ° C within the range of 140 to 180 ° C. Is possible, and
4) It is possible to arrange more weight rolls along the traveling direction in the subsequent stages.
Is a manufacturing apparatus characterized by

The apparatus of the present invention used for the production of a double-sided corrugated paper, in which the present invention particularly demonstrates its significance, adds components necessary for the formation of the double-sided corrugated paper to the above basic structure. Is. The components including the added part are as follows,
a ₁ ) An apparatus for producing A flute single-sided corrugated cardboard, comprising: means for step-forming a base paper for A flute core to obtain an A flute core; and means for bonding the obtained core to an A flute liner;
a ₂ ) An apparatus for producing a B flute single-sided cardboard comprising means for step-forming a base paper for B flute core to obtain a B flute core and means for bonding the obtained core to a B flute liner;
b ₁ ) A series of a preheater roll provided as necessary for preheating the manufactured A flute single-sided cardboard, a moistener for humidifying by blowing low temperature steam, and a series of heater rolls for heating,
b ₂ ) A preheater roll provided as necessary for preheating the manufactured B flute single-sided cardboard, a moistener for humidifying by blowing low-temperature steam, and a series of heater rolls for heating,
c ₁ ) Glue machine for applying a paste material in which starch is dispersed in water to the top of the core of a humidified and heated A flute single-sided cardboard,
c ₂ ) Glue machine for applying a paste material in which starch is dispersed in water to the top of the core of the B flute single-sided corrugated board heated and heated
d ₁ ) A steamer for spraying water vapor onto the glue material applied to the top of the core of the A flute single-sided cardboard to make it semi-gelatinized,
d ₂ ) Steamer for spraying water vapor onto the glue material applied to the top of the core of the B flute single-sided cardboard to make it semi-gelatinized,
e) A series of pre-heater rolls, if necessary, for preheating the front liner paper, a moistener for humidifying by spraying low temperature steam, and a heater roll for heating,
f) A pair of rolls for stacking and integrating the B flute single-sided cardboard and the A flute single-sided cardboard on the front liner paper,
g) A heating plate for heating the integrated front liner, the B flute single-sided cardboard and the A flute single-sided cardboard, which are arranged in series and can control the temperature in at least three groups, and h) a group of a number of rolls and weight rolls for heating and drying and shaping a corrugated cardboard sheet comprising a single-sided corrugated cardboard and a front liner on the top of the heating platen;
In an apparatus composed of
1) The preheater roll and the heater roll have a corrugated top of A flute single-sided cardboard and B flute single-sided cardboard at 60 ± 10 ° C, B flute single-sided cardboard liner at 90 ± 5 ° C, and liner at 50 ± 10 ° C. Each can be adjusted,
2) The gap between the application roll and the doctor roll of the glue machine can be set to a minimum of 0.08 mm over the entire width, and
3) The temperature of the three groups of heating plates is set so that the temperature gradually increases in the order of low → medium → high along the traveling direction, and there is a difference of at least 20 ° C within the range of 140 to 180 ° C. Is possible, and
4) It is possible to arrange more weight rolls along the traveling direction in the subsequent stages.
Is a manufacturing apparatus characterized by

In the production of double-sided corrugated paper, when plain paper is selected as the base paper for the A flute core or B flute core, the line speed can be selected at a high level. At this time, it is appropriate to operate with the necessary amount of paste applied. On the other hand, when reinforced paper is selected as the core paper, the line speed must be slightly reduced. It is appropriate to operate with a slightly larger amount of paste material than that of plain paper. This difference is based on the difference in the water absorption of the core paper.

In the conventional operation, the temperature at the top of the core to which the paste material is applied and the temperature of the liner are usually as high as 90 to 110 ° C. Such a high temperature was required because of the large amount of paste material to be applied, but by minimizing the paste material according to the present invention,
-In the manufacture of double-sided corrugated paper, the corrugated top is 60 ± 10 ° C, the liner is 50 ± 10 ° C
-In the manufacture of double-sided corrugated paper, the corrugated top of A flute single-sided cardboard is 60 ± 10 ° C, the liner of B flute single-sided cardboard is 80 ± 5 ° C, the liner is 50 ± 10 ° C,
The use of much lower temperatures is now possible. The actual heating temperature can be lowered as the amount of paste applied can be reduced, and the lower the temperature, the more preferable. The optimum temperature within this range can be easily found by those skilled in the art in practicing the present invention.

In order to minimize the amount of glue to be applied, the gap between the glue machine application roll and doctor roll can be set to a minimum of 0.08 mm over the entire length from the viewpoint of equipment. It is necessary to be. As described above, the amount of the glue material needs to be slightly increased or decreased depending on whether the selected flute core sheet is plain paper or reinforced paper. In the production of starch paste used for the production of corrugated paper, a ratio of water 3 to starch 1 is usually adopted in weight ratio, and the amount applied is approximately 30 g / m ² (per unit area of the material). Corrugated has reached the projected area). According to the present invention, the amount of the paste material to be applied can be reduced by at least 20% as seen in the examples described later.

The heating and pressurization on the hot platen after laminating one single-sided cardboard and liner, or two single-sided cardboard and liner, as described above, gradually increases the temperature along the traveling direction, In addition, the temperature rise is matched with a specific condition, and the weight rolls for pressurization are arranged so as to increase in the subsequent stages. Such a selection is based on the technical idea of “finishing carefully into a product” at the end of the process of producing corrugated paper. In the conventional manufacturing technology, it was necessary to evaporate a large amount of water even if it reached the hot plate due to the use of a large amount of glue, so the front stage of the hot plate was made hotter than the subsequent stage, and sufficient heating and pressurization were performed in each stage. In contrast to the mainstream approach, the present invention differs from that. Conventionally, it is appropriate that the temperature of the front heating plate is 170 ° C. inside and outside, and the temperature of the rear heating plate is 150 ° C. inside and outside. In the present invention, as described above, the temperature is gradually increased so that a difference of at least 20 ° C. occurs over three stages within the range of 140 to 180 ° C. This difference is preferably about 30 ° C. In a regular apparatus, the arrangement of weight rolls can be easily changed.

The main part from the preheater roll to the inlet of the heating plate through the Moisner, glue machine and steamer originally uses the apparatus having the configuration shown in FIG. 1, but the actual operation mode is as shown in FIG. Thus, double-sided corrugated paper was produced. Reinforced paper was selected as the core paper. The size is as follows.
A flute: 5mm
B flute: 3 mm (thus total thickness: 8 mm)
Glue machine, the roll and the doctor roll gap to apply the paste material and 0.15mm, was 24g per the application amount of the starch slurry to the product corrugated paper 1m ^2. This coating amount is relatively large because reinforced paper was selected as the core base paper, but it is still 20% less than the amount of paste material conventionally applied in the production of the same type of corrugated paper. .

This apparatus is originally intended to produce a double-sided corrugated paper (DBFB) by bonding a front liner (L) to an A flute single-sided cardboard (AF) and a BF single-sided cardboard (BF) according to the prior art. 1 was used in such a manner that a large amount of paste material was applied while heating to a high temperature, the actual usage situation was as shown in FIG. That is, the AF single-sided corrugated cardboard (AF) is heated in sufficient contact with the preheater roll (11A) of the triple roll heater, and after being given moisture by the Moisner (12A), the heater roll (13A) After further heating and applying a large amount of glue material by the glue machine (14A), the steamer (15A) gives water and temperature to the hot platen (21) through the integrated roll set (16). Carried. Similarly, the B flute single-sided cardboard (BF) is heated in sufficient contact with the pre-heater roll (11B) of the triple roll heater, and after being given moisture by the Moisner (12B), the heater roll (13B) Then, after a large amount of glue material is applied by the glue machine (14B), moisture and temperature are further given by the steamer (15B) to reach the integrated roll set (16). The liner (L) also passes through the preheater roll (11C) -the Moisner (12C) -the heater roll (13C).

When the temperature of the material to be bonded is not excessively increased in accordance with the present invention and the amount of paste applied is minimized, the path through which the material passes through the apparatus is different as shown in FIG. The liner (L) is brought into contact with the preheater roll (11C) of the heater roll, but the A flute single-sided cardboard (AF) and the B flute single-sided cardboard (BF) are not in contact with the preheater roll (11A, 11B) of the heater roll. The heater rolls (13A, 13B) are only contacted after hydration by the Moisner. Since it is such an aspect, the temperature of each part when applying a paste is as follows, respectively:
A flute single side cardboard top 60 ° C
B-flute single-sided cardboard top 60 ° C
50 ° C on the back side of the front liner
The temperature at the top of the single-sided cardboard does not need to be further heated when the product sent from each manufacturing process is sent directly to the bonding process. This is because in the production of single-sided cardboard, the material is usually heated to 100-105 ° C, so even if it reaches the production process of double-sided cardboard, the temperature is maintained at 60-65 ° C, so it can be used as it is. Because. In FIG. 1 and FIG. 2, the inside of the roll is hatched to indicate that it has a function of overheating through a heat medium (usually steam).

The hot platens were arranged in series in three groups: the front stage (21), the middle stage, and the rear stage. The surface temperature set for each group and the number of weight rolls (24) are compared with conventional operating conditions as follows.
Hot plate temperature Number of weight rolls
(First stage) (Middle stage) (Second stage) (First stage) (Middle stage) (Second stage) Total conventional technology 170 ° C-160 ° C-150 ° C 30-20 pieces-10 pieces 60 cases Example 1 150 ° C-160 ° C-170 ° C 10-20-30-60

Under these conditions, the line speed during steady operation could be operated at 280 m / min. This corresponds to 93% of the maximum capacity of the device. At the beginning and end of the work of attaching tape to corrugated paper, it was necessary to reduce it to 100 m / min when the line speed was the lowest, but even in that case, there was no substantial effect on the quality of the product. It was.

In this case as well, the apparatus having the configuration shown in FIG. 1 is used, and the actual operation is as shown in FIG. 2, except that the back liner of the A flute single-sided cardboard is in a form in which heating is enhanced, and the manufacture of double-sided cardboard Was done. The core base paper is plain paper. The size is the same as in Example 1. In the glue machine, the gap between the roll to which the paste material was applied and the doctor roll was 0.10 mm, and the amount of starch slurry applied was 30 g per 1 m ² of product corrugated paper. This coating amount is about 20% less than the amount normally applied according to the prior art when plain paper is selected as the core paper.

In this example, the A flute single-sided cardboard (AF) passes through the Moisner without contacting the pre-heater roll (11A), contacts the heater roll (13A), is heated, and reaches the glue machine (14A). . The B flute single-sided corrugated cardboard (BF) passes through the route of contacting the preheater roll (11B), passing through the Moisner, further contacting the heater roll (13B), and then reaching the glue machine (14B). The liner (L) is contacted with the preheater roll (11C) and then given moisture by the moistener (12C). The liner (L) comes into contact with one heater roll (13C), and two single-sided cardboards are formed by the integrated roll set (16). And integrated.

In this operation, the temperatures at which the glue was applied were as follows:
A-flute single-sided cardboard top 60 ° C
B flute one side cardboard back liner 90 ° C
B flute single-sided cardboard top 60 ° C
The back side of the front liner 50 ℃
In this case, the temperature at the top of the single-sided cardboard may be the temperature directly sent from the manufacturing process, that is, 60 ° C. or outside, but the back liner of the B flute single-sided cardboard is heated to the above 90 ° C. or It is necessary to keep the temperature close to that. The set temperature of the hot platen and the arrangement of the weight rolls (24) were the same as in Example 1.

Under these conditions, the line speed during steady operation was set to 300 m / min and the operation could be performed with a margin. This corresponds to 95% of the maximum capacity of this device. In this example as well, the line speed had to be reduced to about 100 m / min at the start and end of the work of attaching the tape to the corrugated paper, but even in that case, there was a substantial difference in product quality. There wasn't.

In the above embodiment, the existing equipment happens to be operated under conditions different from the conventional operating conditions, and thus there is a portion that is not used in a part of the apparatus. However, the above embodiment is based on the technical idea of the present invention. Needless to say, if the entire apparatus is designed, a wasteboard-free corrugated board manufacturing apparatus can be obtained without unnecessary parts.

The conceptual side view which showed the principal part of the apparatus which manufactures a double-sided corrugated paper by a prior art. In the figure, a hatched cross section represents a heater roll in which a heating medium is introduced to perform the heating function (the same applies hereinafter). The conceptual side view which showed the aspect at the time of using the apparatus of FIG. 1 for manufacture of double-sided corrugated paper according to this invention.

AF A flute single side corrugated board BF B flute single side corrugated board L liner DBFB Product double side corrugated paper 11A, 11B, 11C Preheater roll 12A, 12B, 12C Moistner 13A, 13B, 13C Heater roll 14A, 14B Glue machine 15A, 15B Roll set 21 Hot plate (front)
24 weight roll

Claims (6)

A method for producing double-sided corrugated paper, comprising the following steps:
A) corrugating the core core paper, and manufacturing the single-sided cardboard by pasting the molded core with the back liner;
B) Increasing the temperature by preheating the manufactured single-sided cardboard in contact with the preheater roll, or increasing the temperature by heating the contact with the heater roll after replenishing moisture with a moistener,
C) Applying a glue material in which starch is dispersed in water in a glue machine to the top of the core of single-sided cardboard,
D) The paste material is semi-gelatinized by spraying steam from the steamer on the applied paste material and heating it.
E) Increasing the temperature by bringing the front liner into contact with the pre-heater roll and preheating it, or increasing the temperature by making contact with the heater roll after replenishing moisture with a moistener as it is,
F) On the front liner, the above single-sided cardboard is superposed and integrated, and G) the integrated one is supplied onto a heating plate composed of at least three groups maintained at different heating temperatures. By using a group of rolls including weight rolls, press against a heating plate via a canvas belt and heat, fully paste the paste that has been semi-gelatinized, proceed with adhesion, and dry.
In the manufacturing method with the basic process,
1) When heating the single-sided cardboard and liner in contact with the heater roll or preheater roll and the heater roll, the temperature of the heat medium introduced into these rolls is adjusted, and the contact angle with the roll is adjusted to adjust the single-sided cardboard and liner. Adjust the top of the corrugated cardboard corrugation to 60 ± 10 ° C and the liner to 50 ± 10 ° C.
2) The amount of glue applied in the glue machine is set to a minimum amount necessary for adhesion or a range close to that depending on the type of core paper used.
3) heating plates which are arranged in series, divided into front-middle-rear stage of the three groups, the temperature of each group, so as to increase gradually in the order of low → medium → high along the traveling direction, first and second stages of Setting the temperature to be at least 20 ° C. within the range of 140-180 ° C., and
4) Operate with the number of weight rolls set so that the number of weight rolls increases later.
A method for producing double-sided corrugated paper, characterized by A method for producing double-sided corrugated paper, the following steps:
A ₁ ) A flute single-sided cardboard is produced by step-forming base paper for A-core and bonding the formed A-core to a back liner;
A ₂ ) Forming a B flute single-sided cardboard at the same time by step-forming a B-core base paper and bonding the formed B-core to a back liner;
B ₁ ) Increase the temperature by preheating the manufactured A flute single-sided cardboard in contact with the pre-heater roll, or, as it is, replenishing moisture with a Moisner and heating it in contact with the heater roll. To increase,
B ₂ ) Increase the temperature by preheating the manufactured B flute single-sided cardboard in contact with a preheater roll, or increasing the temperature by replenishing moisture with a moistener and heating it in contact with the preheater. Doing things at the same time,
C ₁ ) Applying a glue material in which starch is dispersed in water in a glue machine on the top of the center of the A flute single-sided cardboard,
C ₂ ) simultaneously applying a glue material in which starch is dispersed in water in a glue machine to the top of the core of the B flute single-sided cardboard,
D ₁ ) A glue is applied to the top of the core of the flute single-sided corrugated cardboard by spraying steam from a steamer and heating the paste to make it semi-gelatinized,
D ₂ ) Simultaneously carrying out heating by spraying water vapor from a steamer on the glue material applied to the top of the core of the B flute single-sided corrugated cardboard,
E) Increasing the temperature by bringing the front liner into contact with the pre-heater roll and preheating it, or increasing the temperature by making contact with the heater roll after replenishing moisture with a moistener as it is,
F) On the front liner, the B flute single-sided cardboard and the A flute single-sided cardboard described above are overlapped and integrated, and G) heat of at least three groups maintained at different heating temperatures. Supply to the board, press against the heating board with a group of rolls containing multiple weight rolls, heat, completely paste the semi-gelatinized paste material, advance the adhesion, dry dry,
In the manufacturing method with the basic process,
1) When heating the A flute single-sided cardboard, the B flute single-sided cardboard and the liner in contact with the preheater roll and the heater roll, the temperature of the heat medium introduced into these rolls and the contact angle with the roll are adjusted. The top of the corrugated corrugated A flute corrugated board is adjusted to 60 ± 10 ° C, the liner of the B flute corrugated cardboard is adjusted to 90 ± 5 ° C, and the liner is adjusted to 50 ± 10 ° C.
2) The amount of glue applied in the glue machine is set to a minimum amount necessary for adhesion or a range close to that depending on the type of core paper used.
3) heating plates which are arranged in series, divided into front-middle-rear stage of the three groups, the temperature of each group, so as to increase gradually in the order of low → medium → high along the traveling direction, first and second stages of Setting the temperature to be at least 20 ° C. within the range of 140-180 ° C., and
4) Operate with the number of weight rolls set so that the number of weight rolls increases later.
Is a method for producing a double-sided corrugated paper. 3. Production of double-sided corrugated cardboard according to claim 2, wherein plain paper is selected as the base paper for the B flute core, and the line speed is high, so that the amount of paste applied is close to the minimum amount necessary for bonding. Method. 3. A method for producing a double-sided corrugated cardboard according to claim 2, wherein a reinforced paper is selected as the B flute core paper, and the line speed is reduced, so that the amount of paste applied is larger than the minimum amount necessary for bonding. . An apparatus for producing double-sided corrugated paper,
a) an apparatus for producing single-sided cardboard, comprising: means for step-forming a core sheet; and means for bonding the formed core to a back liner;
b) A series of moisturizer for heating and humidifying low-temperature steam for preheating the produced single-sided cardboard and a series of heater rolls for heating, or a series in which a pre- heater roll is added to the preceding stage ,
c) A glue machine for applying a paste material in which starch is dispersed in water to the top of the core of a humidified and heated single-sided cardboard,
d) a steamer for spraying water vapor onto the glue applied to the top of the core of the single-sided cardboard to make it semi-gelatinized,
e) A series of moisturizers for heating by heating low temperature water vapor and preheating the front liner paper, and a series of heater rolls for heating, or a series in which a preheater roll is added in front of them .
f) A pair of rolls for stacking and integrating the single-sided cardboard on the front liner paper,
g) a heating plate for heating the integrated front liner and single-sided cardboard, which are arranged in series and can be controlled in at least three groups, and h) at the top of the heating plate A group of a number of rolls and weight rolls for heating and drying and corrugating corrugated paper comprising a single-sided corrugated cardboard and a front liner;
In an apparatus composed of
1) The preheater roll and the heater roll can be adjusted to 60 ± 10 ° C for the top of the corrugated corrugated board on one side, and 50 ± 10 ° C for the liner.
2) The gap between the application roll and the doctor roll of the glue machine can be set to a minimum of 0.08 mm over the entire length.
3) The three groups of hot plates gradually increase in temperature in the order of low → medium → high along the traveling direction, and there is a difference of at least 20 ° C between the front and rear stages within the range of 120 to 160 ° C. And can be set as
4) It is possible to arrange more weight rolls along the traveling direction in the subsequent stages.
An apparatus for producing double-sided corrugated paper. An apparatus for producing double-sided corrugated paper,
a ₁ ) An apparatus for producing A flute single-sided corrugated cardboard, comprising: means for step-forming a base paper for A flute core to obtain an A flute core; and means for bonding the obtained core to an A flute liner;
a ₂ ) An apparatus for producing a B flute single-sided cardboard comprising means for step-forming a base paper for B flute core to obtain a B flute core and means for bonding the obtained core to a B flute liner;
b ₁ ) A series of moisturizers for heating and humidifying low temperature steam to preheat the manufactured A flute single-sided cardboard and a series of heater rolls for heating, or a series b _{2 in} which a preheater roll is added to the preceding stage ) A moistener for preheating the B flute single-sided cardboard produced by spraying low temperature steam and humidifying, and a series of heater rolls for heating, or a series in which a preheater roll is added to the preceding stage,
c ₁ ) Glue machine for applying a paste material in which starch is dispersed in water to the top of the core of a humidified and heated A flute single-sided cardboard,
c ₂ ) Glue machine for applying a paste material in which starch is dispersed in water to the top of the core of the B flute single-sided corrugated board heated and heated
d ₁ ) A steamer for spraying water vapor onto the glue material applied to the top of the core of the A flute single-sided cardboard to make it semi-gelatinized,
d ₂ ) Steamer for spraying water vapor onto the glue material applied to the top of the core of the B flute single-sided cardboard to make it semi-gelatinized,
e) A series of moisteners for preheating front liner paper, moistening with low temperature steam to humidify and heater rolls for heating, or a series with preheater rolls in front of them, f) on front liner paper A pair of rolls for overlapping and integrating the above-mentioned B flute single-sided cardboard and A flute single-sided cardboard,
g) A heating plate for heating the integrated front liner, the B flute single-sided cardboard and the A flute single-sided cardboard, which are arranged in series and can control the temperature in at least three groups, and h) a group of a number of rolls and weight rolls for heating and drying and shaping a corrugated cardboard sheet comprising a single-sided corrugated cardboard and a front liner on the top of the heating platen;
In an apparatus composed of
1) The preheater roll and the heater roll have a corrugated top of A flute single-sided cardboard and B flute single-sided cardboard at 60 ± 10 ° C, B flute single-sided cardboard liner at 90 ± 5 ° C, and liner at 50 ± 10 ° C. Each can be adjusted,
2) The gap between the application roll and the doctor roll of the glue machine can be set to a minimum of 0.08 mm over the entire length.
3) The three groups of hot plates gradually increase in temperature in the order of low → medium → high along the traveling direction, and there is a difference of at least 20 ° C between the front and rear stages within the range of 120 to 160 ° C. And can be set as
4) It is possible to arrange more weight rolls along the traveling direction in the subsequent stages.
An apparatus for producing double-sided corrugated paper, characterized by

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