JP2001219487A - Method and apparatus for manufacturing paper product, paper bonding paste and method for manufacturing microcapsule of paper bonding paste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the productivity of a paper product while suppressing the scaling-up of an apparatus and preventing the increase in running cost caused by an increase in quantity of heat or the like, in a method and apparatus for manufacturing the paper product, paper bonding paste and a method for manufacturing a microcapsule of the paper bonding paste. SOLUTION: In a paper product manufacturing method for manufacturing a paper product 19 by bonding papers 8, 9 using paste 12, a coating process for coating the laminating places of the papers 8, 9 with microcapsule mixed paste 12a prepared by mixing microcapsules 30, in which NaOH is sealed in high concentration, with the paste 12, and a bonding process for applying a stimulation to the paste 12a applied in the coating process from the outside to destruct the microcapsules 30 mixed with the paste 12a and bonding the papers 8, 9 by utrilizing NaOH released from the microcapsules, are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a paper product, and a method of manufacturing a paper bonding paste and a paper bonding paste suitable for bonding a core and a liner in manufacturing a corrugated cardboard sheet. The present invention relates to a method for producing microcapsules.

[0002]

2. Description of the Related Art When manufacturing a double-sided corrugated cardboard sheet,
A single-faced cardboard sheet (single-stage sheet) is made by joining the core and liner at the single facer part, and a liner is joined to the core of this single-sheet sheet at the double facer part to produce a double-sided cardboard sheet (also simply called cardboard). Finalize.

FIGS. 8 and 9 are views for explaining a conventional cardboard manufacturing apparatus for manufacturing such a cardboard sheet. FIG. 8 is a schematic sectional view for explaining a single facer portion, and FIG. It is a schematic cross section for explaining a double facer part. FIG. 10 shows a cardboard paste (also simply referred to as paste) used in a conventional cardboard manufacturing apparatus.
It is a schematic diagram for demonstrating the manufacturing method of.

As shown in FIG. 8, a single facer portion 80 provided in a corrugated cardboard manufacturing apparatus forms a core 4 by shaping a core paper 4 ′ into a corrugated shape, and forms a bottom portion of the core 4. 4
B and the back liner 3 are bonded to each other using the glue 7 as a medium to produce a single-stage sheet 8.
A pressure roll 2 and a gluing device 5 are provided. The step roll (upper roll) 1A is formed with a corrugated step 1D in which convex portions and concave portions extending in the rotation axis direction of the roll are alternately arranged on the surface of a cylindrical roll. (Lower roll) 1B is a corrugated step 1B in which convex portions and concave portions extending in the rotation axis direction of the roll are alternately arranged on the surface of a cylindrical roll.
E is formed.

[0005] Each stage 1D, 1E of the stage rolls 1A, 1B is
In each case, the convex portions and the concave portions are arc-shaped, and these convex portions and concave portions are continuously and alternately combined to form a continuous corrugation. The step roll 1A and the step roll 1B are combined with the step 1D of the step roll 1A in the molding section 1C.
The step 1E of the step roll 1B meshes with the step 1E so that the core paper 4 'running between the step rolls 1A and 1B is formed in a corrugated step shape.

Therefore, as shown in FIG. 8, the top 4A and the bottom 4B of the core 4 have a traveling direction of the core 4 (ie,
(Longitudinal direction). The pre-process of the step roll 1A is provided with a preheating device (not shown), and the step rolls 1A and 1B have 11 to 12 kg /
A saturated vapor pressure of about ² cm ² is applied, and the surface temperature of each roll is about 170 to 180 ° C. A nip pressure is applied between the step roll 1A and the step roll 1B, and the core 4 is plastically deformed by the heat and pressure to be formed into a corrugated shape. .

The sizing device 5 comprises a container 5a capable of storing liquid glue 7 and sizing rolls 6A and 6B. The sizing rolls 6A and 6B are arranged so as to be in contact with each other. Has been established. The glue 7 is generally manufactured in a glue making device (not shown) by a method described later and then supplied to the container 5a. The gluing roll 6A has a part of its peripheral surface 6a in contact with or immersed in glue 7 stored in a certain amount in the container 5a, and causes the glue 7 to adhere to the peripheral surface 6a while rotating the gluing roll 6A. Then, the paste 7 is adhered to the peripheral surface 6b of the paste roll 6B.

[0008] Further, from the sizing roll 6B, the step roll 1
The glue 7 is applied to the bottom 4B of the core 4 that is guided by B and travels. The pressure roll 2 is disposed such that its surface 2a is in pressure contact with the convex portion of the step 1E of the step roll 1B.
And a back liner 3.

Therefore, the bottom 4B of the core 4 coated with the glue 7 is joined to the back liner 3 at the joint 2A.
The single-stage sheet 8 is conveyed to the next process. As in the case of the step rolls 1A and 1B, a saturated vapor pressure of about 11 to 12 kg / cm ² is introduced into the pressure roll 2, and the roll surface temperature is about 170 to 180 ° C. In addition, since a high nip pressure is applied between the step roll 1B and the pressure roll 2, the joining at the joining portion 2A is performed in a state close to pressure bonding by heat and pressure.

The step roll 1A, the step roll 1B, the pressure roll 2A, and the sizing roll 6 of the single facer unit 80
A and the gluing roll 6B are all set to rotate synchronously. Next, the double facer section will be described with reference to FIG. As shown in FIG. 9, the double facer section 90 provided in the corrugated board manufacturing apparatus includes a front liner 9 attached to the top 8A of the single-stage sheet 8 manufactured by the single facer section 80 in the corrugated board manufacturing process. Is a device that joins as a medium, and includes a transport unit 91, a joining unit 92, and a gluing device 10. Transport unit 91
Has a function of conveying the single-stage sheet 8 and the front liner 9 conveyed from the previous process to the joining portion 92 and carrying them out to the next process, and is constituted by the conveyance rolls 16, 17, 18 and the cotton belt 14. I have. The joining portion 92 is for bonding the conveyed single-stage sheet 8 and the front liner 9, and includes the hot plate 13 and the pressure roll 15.

Further, the gluing device 10 includes a liquid glue 12
And a sizing roll 11A, 11B. The sizing roll 11A and the sizing roll 11B are arranged so as to be in contact with each other. Glue roll 1
1A has a part of its peripheral surface 11a in contact with or immersed in glue 12 stored in a fixed amount in a container 10a.
While 1A rotates, the glue 12 adheres to the peripheral surface 11a, and the glue 12 adheres to the peripheral surface 11b of the sizing roll 11B.

Further, the glue 12 is applied from the gluing roll 11B to the top 8A of the single-stage sheet 8.
The conveying unit 91 conveys the single-stage sheet 8 to which the glue 7 has been applied, and the joining unit 92 starts bonding the front liner 9 and the single-stage sheet 8 at a joining start point 92a, and completes it at the delivery side 92b. It has become. The joining portion 92 includes the hot plate 13 and the pressure roll 15 in the traveling direction of the corrugated cardboard sheet 19.
The pressure roll 15 is connected to the single sheet 8 and the front liner 9 via the cotton belt 14 by the hot plate 13.
It is designed to push in the direction.

The single sheet 8 and the front liner 9 are conveyed and joined while maintaining the state in which the top 8A of the single sheet 8 and the front liner 9 are in contact with each other.
By the way, the pressure roll 15 presses the front liner 9 against the upper surface 13 a of the hot plate 13, transfers the heat of the hot plate 13 to the front liner 9, promotes the gelation of the glue 12, and forms the single-stage sheet 8 and the front liner 9. It functions to promote bonding. Regarding the joining between the single-stage sheet 8 and the front liner 9, if the single-stage sheet 8 and the front liner 9 are pressed toward the hot plate 13 only by the weight of the cotton belt 14, the pressing force on the single-stage sheet 8 and the front liner 9 is insufficient. In addition, heat from the upper surface 13 a of the hot plate 13 cannot be sufficiently transmitted through the front liner 9. Therefore,
In order to satisfactorily join them, pressing force is applied from the inner surface 14B side of the cotton belt 14 using
By improving the heat transfer to the top portion 8A of the single-stage sheet 8, the gelation of the glue 12 is promoted and the joining is completed in a short time.

The single-stage sheet 8 is provided on the outer surface 14 of the cotton belt 14.
a and the surface 8B of the single-stage sheet 8 is conveyed at the same conveyance speed as the peripheral speed of the conveyance rolls 17 and 18. A flexible material is generally used so as not to damage the surface. Pasting rolls 11A, 11B, transport rolls 16, 1
In Nos. 7 and 18, all the rotation axes are parallel and synchronously rotated.
The inner surface 14b of the cotton belt 14 rotates without slipping on the outer circumference of the transport rolls 17 and 18.

Further, a method of manufacturing the pastes 7 and 12 will be described with reference to FIG. The glues 7 and 12 are conventionally used glues for cardboard bonding, and their components are substantially the same. Therefore, the glue 7 will be described below. The glue 7 is made of starch 21 as a base, water 20 and sodium hydroxide (hereinafter NaO).
H) 22A, borax (sodium borate) 23 and the like.

First, a predetermined amount of starch 21 is placed in water 20 and heated to 70 to 80 ° C. and stirred until a paste starch 21A is obtained [Step 1: FIG. 10 (a)]. Next, separately prepared N was formed from NaOH 22A and water 20A.
The paste-like starch 21 prepared in step 1 was prepared by
A is gradually added to A, and stirred and mixed to form a solution 21B [Step 2: FIG. 10 (b)]. Furthermore, after separately adding borax 23 to a predetermined amount of water 20B, the solution 21B produced in the step 2 is gradually added to the solution 24A made by adding the starch 24, followed by stirring to produce the glue 7 [step 3: FIG.
(C)]. The final weight ratio of this paste 7 is about 20 to 30 starch and about 1 or less NaOH per 100 water.

[0017]

In the above-mentioned corrugated cardboard manufacturing apparatus, there is a demand for an increase in the speed of the corrugated cardboard in order to improve the productivity of corrugated cardboard. In this case, how to increase the line speed of the double facer unit 90 becomes an issue. That is, in the double facer section 90, it takes time to dry the glue that joins the core 4 and the front liner 9 of the single-stage sheet 8, and in order to increase the line speed, the drying completion time of the glue is shortened (ie, It is necessary to increase the drying speed of the glue) or lengthen the drying line (joining portion) to secure the residence time of the joining portion in the drying line.

In the latter case, that is, if the length of the line (joining portion) for drying the glue of the sheet is increased, the scale of the manufacturing apparatus becomes large, and various costs are increased. Therefore, the former means is realized, but in order to increase the drying speed of the paste, the concentration of NaOH 22A added for the purpose of controlling the gelation temperature of the paste in the production process of the paste 12 is increased. In addition, it is conceivable to raise the drying / heating temperature of the paste 12 at the joint 92.

However, when the concentration of NaOH 22A contained in the glue is increased, the glue 12 gels at a lower temperature, and so-called glue balls (usually uniformly dispersed starch itself concentrates to form a white color). (The state in which the paste does not fulfill the role of glue), and there is a problem that the bonding becomes insufficient. Further, in order to raise the drying and heating temperature of the glue 12 at the joint 92, it is necessary to raise the temperature of the steam enclosed in the hot plate 13 of the double facer portion 90. Is performed by contact heat transfer over the poor surface liner 9, so that there is a problem that a large amount of heat is eventually required to heat the glue 12.

Such a problem is caused by the single facer unit 8
The same occurs at 0. SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and suppresses the increase in the size of the apparatus, and also increases the productivity of paper products such as corrugated cardboard while preventing an increase in running cost such as an increase in heat. It is an object of the present invention to provide a method and an apparatus for producing a paper product, a method for producing a paper bonding paste, and a method for producing a microcapsule of a paper bonding paste, which can be improved.

[0021]

According to the first aspect of the present invention, there is provided a paper product manufacturing method in which a paper product is manufactured by bonding papers using glue.
A microcapsule encapsulating the microcapsules encapsulated in a high concentration into the glue, applying a microcapsule-mixed glue to a bonding portion of the paper, and applying external stimulus to the glue applied in the coating process. And bonding the paper by breaking the microcapsules mixed in the paste.

According to a second aspect of the present invention, there is provided the paper product manufacturing method according to the first aspect, wherein the paper product is a corrugated cardboard, and in the joining step, the core of the corrugated cardboard and the liner are joined. It is characterized by doing. According to a third aspect of the present invention, there is provided the paper product manufacturing method according to the first or second aspect, wherein in the joining step, pressure, heat, vibration, sound waves, sound waves, and the like are applied to the paste applied in the applying step. The microcapsules are destroyed by applying a stimulus by any of the electric fields.

According to a fourth aspect of the present invention, there is provided a paper product manufacturing apparatus for manufacturing a paper product by bonding papers using glue, wherein the NaOH is encapsulated at a high concentration. A microcapsule-mixed paste composed of capsules mixed into the paste is applied to the bonding portion of the paper at an application section, and the paste applied by the application section is externally stimulated to be mixed into the paste. It is characterized in that it has a joint portion for breaking the microcapsules and joining the paper.

According to a fifth aspect of the present invention, there is provided the paper product manufacturing apparatus according to the fourth aspect, wherein the paper product is a corrugated cardboard, and the center of the corrugated cardboard is lined with the liner at the joint. And is joined. Claim 6
The manufacturing apparatus of a paper product according to the present invention is the manufacturing apparatus according to claim 4 or 5, wherein the adhesive applied by the application section is any one of pressure, heat, vibration, sound wave, and electric field. It is characterized in that the microcapsules are destroyed by applying a stimulus.

According to a seventh aspect of the present invention, there is provided a paper bonding paste for use in bonding paper, wherein a microcapsule containing NaOH at a high concentration is mixed therein. The method for producing microcapsules of paper bonding glue according to the present invention according to claim 8 is a method for producing microcapsules mixed in paper bonding glue, wherein an aqueous solution of NaOH is mixed with a styrene-containing solution containing a polymerization initiator and sebacoisyl dichloride. A first step of adding to an acrylic monomer, mixing and stirring to form an aqueous / oil-based emulsion centered on microdroplets of an aqueous NaOH solution in the styrene-acrylic monomer; and The aqueous / oil-based emulsion is
A second step of adding an aqueous OH solution, mixing and stirring to form an aqueous / oil / aqueous emulsion composed of an aqueous NaOH / styrene / acrylic monomer / aqueous NaOH solution, and the aqueous / aqueous emulsion formed in the second step. Hexamethylenediamine is added to the aqueous NaOH solution containing the oil-based / water-based emulsion, and the mixture is stirred and mixed to form an interface between the aqueous NaOH aqueous solution as the outermost phase of the aqueous-based / oil-based emulsion and the styrene / acrylic monomer phase. A third step of forming a nylon thin film on the substrate, and the aqueous system formed in the third step.
By heating the oil-based / water-based emulsion, a styrene / acrylic monomer undergoes a polymerization reaction, and the water-based / oil-based /
A fourth step of converting the styrene-acrylic monomer phase of the aqueous emulsion from a liquid phase to a solid phase and enclosing the NaOH inside the styrene-acrylic monomer phase.

According to a ninth aspect of the present invention, there is provided a method for producing microcapsules of paste for paper bonding according to the present invention, which comprises mixing an aqueous solution of NaOH with a polymerization initiator and sebacoisyl dichloride. A first step of forming an aqueous / oil-based emulsion centered on microdroplets of an aqueous NaOH solution in the styrene-acryl monomer by mixing and stirring the styrene-acryl monomer. The formed water-based / oil-based emulsion is added to an aqueous NaOH solution to which hexamethylenediamine has been added, and the mixture is stirred and mixed with an aqueous NaOH solution / styrene.
A second step of forming a water-based / oil-based / water-based emulsion comprising an acrylic monomer / aqueous NaOH solution and having a nylon thin film at an interface between the outermost NaOH aqueous solution and a styrene / acrylic monomer phase; The styrene / acrylic monomer is polymerized by heating the aqueous / oil / water-based emulsion formed in the step to convert the styrene / acrylic monomer phase of the aqueous / oil / water-based emulsion from a liquid phase to a solid phase. A third step of encapsulating the NaOH inside the styrene-acrylic monomer phase.

According to a tenth aspect of the present invention, there is provided a method for producing microcapsules of a paper bonding paste according to the present invention, which comprises mixing a NaOH aqueous solution with a polymerization initiator and styrene. A first step of adding to an acrylic monomer, mixing and stirring to form an aqueous / oil-based emulsion centered on microdroplets of an aqueous NaOH solution in the styrene-acrylic monomer; and The aqueous / oil-based emulsion is
A second step of adding an aqueous OH solution, mixing and stirring to form an aqueous / oil / aqueous emulsion composed of an aqueous NaOH / styrene / acrylic monomer / aqueous NaOH solution, and the aqueous / aqueous emulsion formed in the second step. Adding tannin to the aqueous NaOH solution containing the oil / water emulsion,
A third step of forming a methylcellulose thin film at the interface between the aqueous NaOH aqueous solution and the styrene / acrylic monomer phase as the outermost phase of the aqueous / oil / aqueous emulsion by mixing and stirring; and the third step. The aqueous system / oil system /
The styrene / acrylic monomer is polymerized by heating the aqueous emulsion, and the styrene / acrylic monomer phase of the aqueous / oil / water-based emulsion is changed from a liquid phase to a solid phase. And a fourth step of enclosing NaOH.

[0028] The method for producing microcapsules of paper bonding paste according to the present invention according to claim 11 is a method for producing microcapsules mixed with paper bonding paste, wherein a NaOH aqueous solution is mixed with a styrene / polymer containing a polymerization initiator and methylcellulose. A first step of adding to an acrylic monomer, mixing and stirring to form an aqueous / oil-based emulsion centered on microdroplets of an aqueous NaOH solution in the styrene-acrylic monomer; and The aqueous / oil emulsion was added to an aqueous solution of NaOH to which tannin was added, and the mixture was stirred and mixed with an aqueous solution of NaOH / styrene / acrylic monomer / N
a second step of forming an aqueous / oil / aqueous emulsion comprising an aOH aqueous solution and having a methylcellulose thin film at the interface between the outermost NaOH aqueous solution and the styrene / acrylic monomer phase; and The styrene / acrylic monomer is polymerized by heating the aqueous / oil / aqueous emulsion thus obtained, and the aqueous / oil / water emulsion is heated.
A third step of converting the styrene-acrylic monomer phase of the oil-based / water-based emulsion from a liquid phase to a solid phase and enclosing the NaOH in the styrene-acrylic monomer phase.

According to a twelfth aspect of the present invention, there is provided the microcapsule manufacturing method for paper bonding paste according to the present invention, wherein the NaOH aqueous solution used in the first step is used in the microcapsule manufacturing method according to any one of the eighth to eleventh aspects. It is characterized by adding a surfactant in advance.

[0030]

Embodiments of the present invention will be described below with reference to the drawings. (A) Description of First Embodiment FIGS. 1 to 3 are a method and an apparatus for manufacturing a paper product according to a first embodiment of the present invention, a paper bonding paste and a microcapsule of paper bonding paste (simply, a capsule). FIG. 1 is a schematic view for explaining a method for manufacturing the microcapsule, FIG. 2 is a schematic cross-sectional view for explaining a single facer portion of the manufacturing apparatus, and FIG. It is a schematic cross section explaining the double facer part concerning the manufacturing device.

First, a paper product manufacturing apparatus according to this embodiment will be described. In this embodiment, since a cardboard (double-sided corrugated cardboard sheet) is manufactured as a paper product, a paper product manufacturing apparatus is referred to as a cardboard manufacturing apparatus. This corrugated cardboard manufacturing apparatus is provided with a point that microcapsules in which NaOH is encapsulated are mixed in a paper bonding paste (corrugated cardboard paste, also simply referred to as paste) to be used, and a means for breaking the coating of the microcapsules is provided. It is characterized by the point, and the other parts are configured in the same manner as the prior art.

First, the single facer section 80A provided in the present cardboard manufacturing apparatus will be described.
As shown in FIG. 2, a single facer portion 80A forms a core 4 by shaping a core paper 4 ′ into a corrugated shape in a molding portion 1 </ b> C and forms a bottom 4 </ b> B of the core 4 and a back liner 3. The glue 7a is bonded using the medium as a medium.
B, a pressure roll, a gluing device (coating unit) 5A, and a film breaking device 36. In the step roll 1A, a corrugated step 1D in which convex portions and concave portions extending in the rotation axis direction are alternately arranged on the surface of a cylindrical roll is formed.
In the step roll 1B, a corrugated step 1E in which convex portions and concave portions extending in the rotation axis direction are alternately arranged is formed on the surface of a cylindrical roll.

Each of the step 1D of the step roll 1A and the step 1E of the step roll 1B has a convex portion and a concave portion in an arc shape.
These convex portions and concave portions are continuously and alternately combined to form a continuous corrugation. These corrugated rolls 1
The step 1D of the step A and the step 1E of the step roll 1B are meshed with each other in the molding part 1C, and the center 4 is formed by the engagement of the projection of the step 1D of the step roll 1A and the recess of the step 1E of the step roll 1B.
Is formed, and the bottom 4B of the core 4 is formed by the engagement of the concave portion of the step 1D of the step roll 1A with the convex portion of the step 1E of the step roll 1B. As shown in FIG. 2, the top 4A and the bottom 4B of the core 4 thus formed are formed alternately and continuously in a direction perpendicular to the traveling direction of the core 4 (longitudinal direction).

A preheating device (not shown) is provided in a pre-process of the forming section 1C including the step rolls 1A and 1B, and the core paper 4 'is heated in advance and sent to the forming section 1C. Furthermore, 11 to 12 kg is added to the step rolls 1A and 1B.
/ Cm ^2, and the surface temperature of each roll is about 170 to 180 ° C. Also,
A nip pressure is applied between the step roll 1A and the step roll 1B. As a result, the core paper 4 'which has been heated in advance is plastically deformed by further applying heat and pressure, so that it is reliably formed into a corrugated shape.

The gluing device (coating unit) 5A is provided with a liquid glue 7
a) and a sizing roll 6A, 6B. The glue 7a is made of Na containing high-concentration NaOH 27 by a manufacturing method described later with reference to FIG.
OH-encapsulated microcapsules 30 and glue (general starch glue)
The glue 7a produced by a glue making device (not shown) is supplied into the container 5a. The gluing roll 6A has a part of its peripheral surface 6a in contact with or immersed in glue 7a stored in a fixed amount in the container 5a.
a, and adheres to the peripheral surface 6b of the sizing roll 6B at the contact portion 6C. For this reason, the sizing roll 6A and the sizing roll 6B are arranged so as to be in contact with each other via the glue 7a in a state where the NaOH-encapsulated microcapsules 30 are not broken at the contact portion 6C.

On the other hand, the sizing roll 6B is similar to the sizing roll 6B in that the convex portion of the step 1D of the step roll 1B and the sizing roll 6B
The aOH-enclosed microcapsules 30 are in contact with each other via the glue 7a in such a manner as not to be destroyed.
The glue 7a is applied to the bottom 4B of the corrugated core 4 between the step roll 1B and the step roll 1B.

The pressure roll 2 is provided at the bottom 4 B of the core 4.
And the back liner 3 are bonded by heat and pressure in a state close to pressure bonding at the joint 2A at the step roll 1B.
It is arranged in a state of being pressed against. Film destruction device 36
Is the NaOH-encapsulated microcapsule 3 contained in the glue 7a.
0 is destroyed by applying energy such as heat or sound waves, and is disposed close to the upstream side of the joint 2A. Here, the film destruction device 36 irradiates the near-infrared ray to the glue 7a applied to the bottom 4B of the core 4,
The glue 7a is melted by the radiant energy, the coating temperature is raised to the NaOH-encapsulated microcapsules 30 contained in the glue 7a and melted by heat, and the coating (the nylon thin film 29 + styrene-acrylic monomer) which is the outer shell of the NaOH-enclosed microcapsules 30 The phase 50b) is to be destroyed.

Then, the encapsulated high-concentration NaOH flows into the surrounding glue 7 and immediately undergoes a chemical reaction to become a glue 7b having a high NaOH concentration, and gelation is rapidly promoted at a temperature lower than the glue 7; It is designed to gelatinize. Since a high nip pressure is applied between the step roll 1B and the pressure roll 2, the NaOH encapsulated microcapsules 30
Can be broken by this pressure, but in order to rapidly gel the glue 7b immediately before the joint 2A,
By disposing the film breaking device 36 in front of the joint 2A, the glue 7b having a high NaOH concentration is surely formed before reaching the joint 2A.

In this case, the NaOH that has flowed out becomes glue balls with the lapse of time, but this does not occur because the film breaking device 36 is provided immediately before the joint 2A. In addition, Na which could not be destroyed by the
Even when the OH-encapsulated microcapsules 30 are present, they can be broken by the nip pressure, so that the NaOH-encapsulated microcapsules 30 can be effectively used.

As in the prior art, saturated steam is injected into the pressure roll 2, but in this embodiment,
By using the NaOH-encapsulated microcapsules 30, glue 7b having a higher NaOH concentration than before is produced,
In order to advance gelation at a higher speed than before, the step roll 1 which has been conventionally heated to promote the gelation of the paste
b. The temperature of the pressure roll 2 can be set lower than in the past. Therefore, the amount of heat required to heat the step roll 1b and the pressure roll 2 can be saved.

As described above, the bottom 4B of the core 4 to which the glue 7b is attached is joined to the back liner 3 at the joint 2A.
The single-stage sheet 8 is conveyed to the next process. Next, the double facer unit will be described with reference to FIG. As shown in FIG. 3, the double facer portion 90A provided in the corrugated board manufacturing apparatus is provided with a front liner 9 and a glue 12b on the top 8A of the single-stage sheet 8 manufactured by the above-described single facer portion 80A in the corrugated board manufacturing process. Is a device that joins a sheet as a medium, and includes a transport unit 91, a joining unit 92A, and a gluing device (coating unit) 10A. The transport unit 91 transports the single-stage sheet 8 and the front liner 9 transported from the previous process to the joining unit 92A and transports the joined corrugated cardboard sheet 19 to the next process. , 18 and the cotton belt 14.

The joining portion 92A is for bonding the conveyed single-stage sheet 8 and the front liner 9, and includes a hot plate 13A and a pressure roll 15. Further, the sizing apparatus 10A is composed of a container 10a capable of storing the sizing 12a and sizing rolls 11A and 11B. The gluing roll 11A has a part of its peripheral surface 11a in contact with or immersed in the glue 12a stored in a certain amount in the container 10a, and causes the glue 12a to adhere to the peripheral surface 11a while the gluing roll 11A rotates. The sheet is conveyed while being attached to the peripheral surface 11b of the sizing roll 11B at the contact portion 11C.

The glue 12a is made of high-concentration Na produced by the same method as the glue 7a of the single facer portion.
It is composed of a NaOH-encapsulated microcapsule 30 in which an OH aqueous solution 27 is encapsulated, and a paste (general starch paste) 12, and a paste 12 a manufactured by a paste-making apparatus (not shown).
Are supplied to the container 10a. The gluing roll 11A has a glue 12 whose part is stored in the container 10a.
The glue roll 11A is rotated while the glue roll 11A is in contact with or abuts on the peripheral surface 11a of the glue roll 11A, and is conveyed while being adhered to the peripheral surface 11b of the glue roll 11B at the contact portion 11C. For this reason, the sizing roll 11A and the sizing roll 11B are separated from each other in a state where the NaOH-encapsulated microcapsules 30 are not broken at the contact portion 11C.
a so as to be in contact with each other.

On the other hand, the gluing roll 11B is arranged so as to be in contact with the top 8A of the single-stage sheet 8 at the contact portion 110, and the adhesive 12a is attached to the top 8A of the single-stage sheet 8 at the contact portion 110. Is applied. The film breaking device 37 has the same function as the film breaking device 36, and is disposed close to the upstream side of the joint 92A. Here, the film breaking device 37 applies the near-infrared ray to the top 8A of the single-stage sheet 8 on which the glue 12a is applied.
, The coating temperature of the NaOH-encapsulated microcapsules 30 is increased by the radiant energy, and the NaOH-encapsulated microcapsules 30 contained in the glue 12a are destroyed by heating and melting.

The NaOH-encapsulated microcapsules 30 contained in the glue 12a are broken by the film breaking device 37, and the encapsulated core material 27 of the high-concentration NaOH aqueous solution immediately causes a chemical reaction with the surrounding glue 12, so that the NaOH The paste 12b has a high concentration, and the gelation is rapidly promoted at a temperature lower than that of the paste 12, so that the paste is gelatinized. Glue 12
The single-stage sheet 8 coated with “b” is conveyed to the joining portion 92A by the conveying portion 91, and at the joining start portion 92a, lamination with the front liner 9 is started, and the exit side 92b of the joining portion 92A.
Is to be completed.

At the joint 92, a plurality of hot plates 13A are arranged below the traveling path of the corrugated cardboard sheet 19 in FIG. A plurality of pressure rolls 15 are arranged side by side, and a single-stage sheet 8 and a front liner 9 are arranged between the hot plate 13A and the pressure roll 15 such that the top 8A of the single-stage sheet 8 and the front liner 9 face each other. While being transported.

The pressing roll 15 presses the surface 8B of the single-stage sheet 8 in the direction of the hot plate 13A from the inner surface 14B side of the cotton belt 14, and presses the single-stage sheet 8 and the front liner 9 against the surface 13a of the hot plate 13. Thereby, the contact heat transfer from the surface 13a of the hot plate 13A to the front liner 9 through the front liner 9 is improved. Further, the pressure roll 15 and the hot plate 13
A has a length corresponding to the width direction of the single-stage sheet 8 and the front liner 9.

The corrugated cardboard sheet 19 is manufactured by heating and drying the glue 12b adhered to the top 8A of the single-stage sheet 8 with the hot plate 13A. By the way, NaOH that has been broken and flowed out becomes glue balls with the passage of time. However, such a phenomenon does not occur because the film breaking device 37 is provided immediately before the joint 92A. In addition, even when there is the NaOH-encapsulated microcapsules 30 that could not be broken by the film breaking device 37, they can be broken by the pressure from the pressure roll 15, so that the NaOH-enclosed microcapsules 30 can be reliably used effectively. Has become.

The single-stage sheet 8 is provided on the outer surface 14 of the cotton belt 14.
The transport belt 17 is transported at the same transport speed as the peripheral speed of the transport rolls 17 and 18 due to the frictional force between the belt 1 and the cotton belt 14. A flexible material is generally used for the cotton belt 14 so as not to damage the single-stage sheet 8. Can be Here, a method of manufacturing the pastes 7a and 12a will be described. Since the paste 7a and the paste 12a are substantially the same, the paste 7a will be described below.

The glue 7a is composed of the glue 7 and the NaOH-encapsulated microcapsules 30, and the glue 7 is manufactured in the same manner as in the prior art. That is, first, a predetermined amount of starch 21 is put in water 20, heated to 70 to 80 ° C., and stirred until it becomes paste starch 21A [Step 1: FIG.
(A)]. Next, separately, the NaOH aqueous solution 22 generated from the NaOH 22A and the water 20A is gradually added to the pasty starch 21A prepared in the step 1, and the mixture is stirred and mixed to form a solution 21B [Step 2: FIG. (B)]. next,
Separately, after adding borax 23 to a predetermined amount of water 20B, the solution 21B prepared in Step 2 is gradually added to a solution 24A prepared by adding starch 24, followed by stirring to produce the paste 7 [Step 3: FIG. 10 (c)]. The final weight ratio of this paste 7 is about 20 to 30 starch and about 1 or less NaOH per 100 water.

Next, a method of manufacturing the NaOH-enclosed microcapsules 30 will be described. As shown in FIG. 1, the NaOH-encapsulated microcapsules 30 contain a high concentration of N to be encapsulated.
A core substance 27 of an aOH aqueous solution is used as a polymerization initiator (not shown).
And sevacoisyl dichloride 26a and then added to the styrene-acrylic monomer 26, and then subjected to mechanical shearing force by mixing and stirring, thereby causing fine droplets of an aqueous NaOH solution (aqueous / oil-based) in the styrene-acrylic monomer 26. (First emulsion: FIG. 1)
(A)].

At this time, a required amount of a surfactant (not shown) may be added as necessary to adjust the diameter of the microdroplets 27a or to stabilize the microdroplets 27a. Next, the microdroplets 27a formed in FIG. 1A are added to a separately prepared aqueous NaOH solution 27A, mixed again, and a mechanical shearing force is applied by stirring to obtain N 2.
aOH aqueous solution / styrene / acrylic monomer / NaOH
An aqueous / oil / aqueous emulsion 27B composed of an aqueous solution is formed [second step: FIG. 1 (b)].

Further, after hexamethylene diamine 28 is added to the outermost phase NaOH aqueous solution 27A and mixed and stirred, sebacoisyl dichloride 26a in the styrene-acrylic monomer 26 and hexamethylene diamine 28 in the outermost phase NaOH aqueous solution 27A are mixed. Reacts with styrene
Acrylic monomer phase (liquid phase) 50a and outermost phase NaOH
A nylon thin film 29 is formed at the interface with the aqueous solution 27A [third step: FIG. 1 (c)].

Then, the aqueous / oil / aqueous emulsion 27B formed in FIG. 1C is heated to cause a polymerization reaction of the styrene / acryl monomer 26, thereby converting the styrene / acryl monomer phase (liquid phase) 50a to styrene.・
Acrylic monomer phase (solid phase) 50b and high concentration of N
A microcapsule 30 enclosing aOH is completed [fourth step: FIG. 1 (d)].

The styrene-acrylic monomer phase 50
When the nylon thin film 29 is formed at the interface between the a and the outermost NaOH aqueous solution 27A, there is a possibility that NaOH encapsulated from the pinhole-shaped defects in the polymerized film of the styrene-acrylic monomer phase 50a may seep out. This is to prevent this. Under these circumstances, the styrene / acrylic monomer phase is changed from the liquid phase to the solid phase, and the microcapsules 3
By forming 0, the core material 27 of high concentration NaOH is securely enclosed therein.

Further, the styrene / acrylic monomer 26 used in the present embodiment is considered to be the best as a substance capable of greatly changing the film breaking conditions due to temperature, pressure, and the like. Certain other substances may be used. Since the paper manufacturing apparatus according to the first embodiment of the present invention is configured as described above, it operates as follows.

First, the operation until the single-stage sheet 8 is manufactured in the single facer portion 80A will be described with reference to FIG. After the core paper 4 'is preheated (the preheating device is omitted),
In FIG. 2, it is supplied to the upper part of the step roll 1A,
While being in contact with the step 1D, it rotates clockwise in synchronization with the rotation of the step roll 1A, and is conveyed to the forming section 1C. Molded part 1C
Then, the step roll 1A and the step roll 1B that rotates counterclockwise
Thus, a process for molding the core paper 4 'into the corrugated core 4 is performed. That is, the projection of the step 1D of the step roll 1A and the recess of the step 1E of the step roll 1B mesh with each other to form the top 4A of the core 4, and the recess of the step 1D of the step roll 1A and the step 1D of the step roll 1B. The bottom 4B of the core 4 is molded by meshing with the projections of the step 1E.

After the core 4 is formed into a corrugated shape in the forming section 1C, the bottom 4 is formed on the convex portion of the step 1E of the step roll 1B.
B is conveyed while rotating counterclockwise in FIG. 3 together with the step roll 1B in a state where the tops 4A are fitted into the recesses of the step 1E of the step roll 1B. And the core 4
The bottom portion 4B is in contact with the sizing roll 6B of the sizing device 5A at the contact portion 70 while being fitted to the projection of the step 1E of the step roll 1B, and the glue 7a containing the NaOH-encapsulated microcapsules 30 is applied. Is done.

Further, the step roll 1B is rotated, and the coating breaking device 36 provided on the upstream side close to the joint 2A with the pressure roll 2 is used for the glue 7a applied to the bottom 4B of the core 4.
Is irradiated with near-infrared rays, and NaO is irradiated by radiant energy.
When the coating temperature of the H-encapsulated microcapsules 30 is increased and dissolved by heat to destroy the coating of the NaOH-encapsulated microcapsules 30 contained in the paste 7a, the high-concentration NaOH aqueous solution 27
Causes a gelation reaction with glue 7 more rapidly than usual, and glue 7b
Becomes

The film breaking device 36 is not limited to the near-infrared ray, but may apply other energy, and may be replaced by an electron beam or an ultrasonic wave. At this time, in the case of an electron beam, the coating is directly destroyed by electron energy, and in the case of an ultrasonic wave, the coating is destroyed by utilizing vibration energy. Furthermore, in FIG. 2, the pressure roll 2 is supplied while being wound around the surface 2 a of the pressure roll 2 from the lower right side of the pressure roll 2 rotating clockwise.
The joint between the back liner 3 and the bottom 4B of the core 4 is performed at the joint 2A. A high nip pressure is applied between the step roll 1B and the pressure roll 2, and the surfaces of the step roll 1B and the pressure roll 2 are maintained at a high temperature.
In A, the back liner 3 and the core 4 are joined in a crimped state to form a single-stage sheet 8 which is conveyed to the next step.

The glue 7b has a higher Na content than the conventional glue 7.
Because the OH concentration is high, gelation proceeds even at low temperatures,
The glue 7b can be dried in a short time even if the saturated steam supplied into the step roll 1B and the pressure roll 2 has a lower temperature than the conventional one. Next, referring to FIG.
The operation up to the manufacture of the device will be described.

After the single-stage sheet 8 is preheated by a preheating device (not shown), it is conveyed so that the top portion 8A is in contact with the sizing roll 11B, and the contact portion 110 transfers the NaOH from the sizing roll 11B of the sizing device 10A. The glue 12a including the encapsulated microcapsules 30 is applied. Further, the coating breaking device 37 provided on the upstream side close to the joining portion 92A irradiates the glue 12a applied to the top 8A of the single-stage sheet 8 with near-infrared rays, and the coating of the NaOH-encapsulated microcapsules 30 is irradiated by radiant energy. When the temperature is raised and dissolved by heat to destroy the NaOH-encapsulated microcapsules 30 contained in the glue 12a, the NaOH-encapsulated microcapsules 30
The high-concentration aqueous NaOH solution 27 causes a gel reaction with the glue 12 more rapidly than usual, and the glue 12 with a high NaOH concentration
b.

The film breaking device 37 is not limited to near infrared rays, but may apply other energy, and may be replaced by an electron beam or ultrasonic waves. At this time, in the case of an electron beam, the coating is directly destroyed by electron energy, and in the case of an ultrasonic wave, the coating is destroyed by utilizing vibration energy. After that, it is further conveyed and reaches the joining portion 92A while being guided by the outer surface 14a of the cotton belt 14.

On the other hand, after the front liner 9 is preheated by a preheating device (not shown), the front liner 9 is conveyed while being guided by the conveying roll 16 from a direction different from that of the single-stage sheet 8, and reaches the joining start portion 92a. At the joining start portion 92a, the joining between the one-stage sheet 8 and the front liner 9 is started by contact with the top 8A of the single-stage sheet 8 described above. Thereafter, the single-stage sheet 8 and the front liner 9 move between the cotton belt 14 pressed by the load of the pressure roll 15 and the hot plate 13A, and the surface 8B of the single-stage sheet 8
Due to the frictional resistance between the sheet 8 and the outer surface 14a of the cotton belt 14, the sheet 8 advances in the joining portion 92A while being transported substantially in the horizontal direction, and the top portion 8A of the single-stage sheet 8 and the front liner 9 are joined, and the exit side 92b of the joining portion 92A. And is conveyed to the next step as a cardboard sheet 19.

At this time, the glue 12b is on the upper surface 1 of the hot plate 13A.
In response to the contact heat transfer from the surface liner 9 through the front liner 9 and being heated, the moisture of the paste 12b is dried to further promote gelation, but the NaOH concentration in the paste 12b is higher than that of the conventional paste 12. Therefore, the gelation easily proceeds even at a temperature lower than the conventional one, and the bonding can be performed in a shorter time and at a lower temperature than the conventional one.

Therefore, by mixing the microcapsules into the paste, the speeding up of the cardboard manufacturing apparatus can be promoted, and the productivity of the cardboard can be improved. In the single facer section 80A, the temperature of the saturated steam filled in the step roll 1B and the pressure roll 2 can be set lower than usual. Further, in the double facer portion 90A, the glue 1
2b has a higher NaOH concentration than before,
The gelation rate of b is fast, and the upper surface 13a of the hot plate 13A does not have to be raised to the conventionally required temperature. Therefore, when the upper surface 13a of the hot plate 13A is raised to the conventional temperature, the total length of the hot plate 13A can be shorter than in the conventional case.

In this embodiment, the single facer section 80
A, without relying on the nip pressure between the step roll 1B and the pressure roll 2 at A, by the coating breaking device 36 immediately before joining.
Since the aOH-enclosed microcapsules 30 can be reliably destroyed, the nip pressure can be reduced from such a point. Similarly, the double facer unit 90
Also in A, the pressure applied by the pressure roll 15 can be set lower than usual by installing the film breaking device 37.

Furthermore, even if there is a NaOH-encapsulated microcapsule 30 that could not be broken by the film breaking devices 36 and 37, the nip pressure between the step roll 1B and the pressure roll 2 or the pressure roll 15 and the hot plate 13A The NaOH-encapsulated microcapsules 30 can be reliably and effectively used because they can be broken by the pressure during the period. Incidentally, in the manufacturing process of the NaOH-encapsulated microcapsules 30 described in FIG. 1 in the present embodiment, the second process and the third process can be performed as the same process. That is, the first step [FIG.
The aqueous / oil emulsion formed in (a)] is added to an aqueous NaOH solution to which hexamethylenediamine has been added, mixed and stirred to form an N / N having a nylon thin film in the outermost phase.
aOH aqueous solution / styrene / acrylic monomer / NaOH
An aqueous / oil / aqueous emulsion composed of an aqueous solution is formed (this process is the second step). Then, after that, the processing of the fourth step (FIG. 1D) of the first embodiment (in this case, this processing becomes the third step) is performed. Also in this way, the NaOH-enclosed microcapsules 30 can be manufactured. (B) Description of Second Embodiment This embodiment differs from the first embodiment in a part of the material used for the production of microcapsules to be mixed into the paper bonding paste, and other configurations and operations are the same as those in the first embodiment. The same is true. That is, in the first embodiment, in the first step, the microdroplets 27a are formed in the styrene-acrylic monomer 26 containing the sebacoisyl dichloride 26a, whereas in the present embodiment, the methyl cellulose 31a is The micro-droplets 32a are formed in the styrene-acrylic monomer 31 containing. At the start of the third step, NaO
In the present embodiment, tannin 33 is added, while hexamethylenediamine 28 is added to the H aqueous solution 32A. Thereby, in the third step, the outermost phase N
aOH aqueous solution 32A and styrene / acrylic monomer phase 5
At the interface with Oc, a methylcellulose thin film 34 is formed.

Therefore, only the method for producing the NaOH-enclosed microcapsules will be described below. As shown in FIG. 4, the NaOH-encapsulated microcapsules 35 used in the present embodiment include a core material 32 of an NaOH aqueous solution to be encapsulated, and a styrene containing a polymerization initiator (not shown) and sebacoisyl dichloride 31a. -After being added to the acrylic monomer 31, mixed and stirred, and a fine droplet of an aqueous NaOH solution (aqueous /
An oil-based emulsion 32a is formed (first step: FIG. 4A). At this time, a surfactant (not shown) may be added as needed to adjust the diameter of the microdroplets 32a or stabilize the microdroplets 32a.

Next, the fine droplets 32a formed in the first step (FIG. 4A) are combined with a separately prepared NaOH aqueous solution 32.
After the addition into A, the mixture is mixed again, and a mechanical shearing force is applied by stirring to form an aqueous / oil / aqueous emulsion 32B composed of an aqueous NaOH solution / styrene / acrylic monomer / aqueous NaOH solution [second step] : FIG.
(B)].

Further, after adding tannin 33 to the outermost phase NaOH aqueous solution 32A, mixing and stirring again, sebacoisyl dichloride 31a in the styrene-acrylic monomer 31 reacts with tannin 33 in the outermost phase NaOH aqueous solution 32A. Thus, a methylcellulose thin film 34 is formed at the interface between the styrene / acrylic monomer phase (liquid phase) 50c and the outermost phase NaOH aqueous solution 32A [third step: FIG. 4 (c)].

Then, by heating the aqueous / oil / aqueous emulsion 32B formed in the third step (FIG. 4 (c)), the styrene / acryl monomer 31 is polymerized and the styrene / acryl monomer phase (liquid phase) is heated. ) 50c is converted to a styrene-acrylic monomer phase (solid phase) 50d,
The aOH-encapsulated microcapsules 35 are completed [fourth step: FIG. 4D].

In this embodiment, since a material partially different from that of the first embodiment is used, the microcapsules 35 to be manufactured are also substances whose outermost phases are different from those of the first embodiment. Since the physical properties of the external phase are the same as those of the first embodiment, the bottom 4B of the core 4 and the back liner 3
When joining the single-stage sheet 8 and the front liner 9,
Immediately before the start of joining, the film breaking device 36 or the film breaking device 37
By destroying the microcapsules 35, N
The same operation and effect as in the first embodiment can be obtained while effectively utilizing aOH.

In the third step, the styrene-acryl monomer phase 50d and the outermost phase NaOH aqueous solution 27A
The methylcellulose thin film 34 formed at the interface with the film functions in the same manner as the nylon thin film 29, and prevents the encapsulated NaOH from seeping out due to pinhole-shaped defects in the polymer film of the styrene-acrylic monomer phase 50d. be able to.

As described above, in the same manner as in the first embodiment, the styrene-acryl monomer phase in the outermost phase of the microcapsule 35 is changed from a liquid phase to a solid phase,
Is formed, and the core material 32 of the NaOH aqueous solution is sealed therein, so that a high-concentration NaOH aqueous solution can be easily microencapsulated. The styrene / acrylic monomer 31 used in the present embodiment is also considered to be the best as a substance capable of greatly changing the breaking conditions of the film due to temperature, pressure, and the like. May be used.

By the way, as described in the present embodiment, Na
As for the manufacturing process of the OH-encapsulated microcapsules 35, the second process and the third process can be performed as the same process, similarly to the manufacturing process of the NaOH-encapsulated microcapsules 30 of the first embodiment. That is, the water-based / oil-based emulsion formed in the first step [FIG.
OH aqueous solution with a methylcellulose thin film in the outermost phase.
A water-based / oil-based / water-based emulsion composed of an acrylic monomer / aqueous NaOH solution is formed (this treatment is the second step). Then, after that, the processing of the fourth step (FIG. 4D) of the second embodiment (in this case, this processing becomes the third step) is performed. Also in this way, the NaOH-enclosed microcapsules 35 can be manufactured. (C) Description of Third Embodiment In the present embodiment, a part of the configuration of the single facer unit is the first configuration.
Unlike the first embodiment, other configurations and operations are the same as those of the first embodiment. Therefore, only the single facer section will be described below with reference to FIG. Note that the same reference numerals as those described in FIG. 2 indicate the same or substantially the same portions, and thus detailed description thereof will be omitted.

That is, in the present embodiment, as shown in FIG. 5, the film breaking device 36 in the first embodiment is removed, and the single facer portion 80B itself has the same configuration as that of the conventional art. I have. Of course, also in the present embodiment, the glue 7a used in the gluing device (coating unit) 5A is a NaOH-filled micro-filled with a high-concentration NaOH aqueous solution by the manufacturing method as shown in FIG. 1 in the first embodiment. It is composed of a capsule 30 and a paste 7.

The NaOH-encapsulated microcapsules 30 contained in the glue 7a are destroyed by the nip pressure between the step roll 1B and the pressure roll 2 at the joint 2A. NaO concentration
H flows out into the surrounding glue 7, causing a rapid chemical reaction, and N
The paste 7b has a high aOH concentration, and the gelation is promoted at a lower temperature.

The present embodiment is configured as described above,
With a simpler configuration than the single facer 80A of the embodiment, NaOH can be used effectively without generating glue balls, almost in the same manner as in the first embodiment. Improvement can be promoted. (D) Description of Fourth Embodiment In the present embodiment, a part of the configuration of the double facer unit is different from that of the first embodiment, and the other configurations and operations are the same as those of the first embodiment. Therefore, only the double facer portion will be described below with reference to FIG. Note that the same reference numerals as those described in FIG. 3 indicate the same or substantially the same portions, and thus detailed description thereof will be omitted.

That is, in the present embodiment, as shown in FIG. 6, the film breaking device 37 in the first embodiment is removed, and the double facer portion 90C itself has the same configuration as that of the prior art. Of course, also in the present embodiment, the glue 12a used in the gluing device (coating unit) 10A is a NaOH-filled micro-filled with a high-concentration NaOH aqueous solution by the manufacturing method as shown in FIG. 1 in the first embodiment. It is composed of a capsule 30 and a paste 7.

The NaOH-encapsulated microcapsules 30 contained in the glue 7a are broken by the pressure of the pressure roll 15 at the joint 92C. After flowing out to the surface 12, a rapid chemical reaction occurs, and the paste 12b has a high NaOH concentration, and the gelation is promoted at a lower temperature.

The present embodiment is configured as described above, and has a simpler structure than the double facer 90A of the first embodiment, so that NaOH can be effectively used without generating glue balls in substantially the same manner as the first embodiment. Thus, the speed of the apparatus can be increased to promote the improvement of productivity. (E) Description of Fifth Embodiment In the present embodiment, as in the fourth embodiment, the coating destruction device 37 provided in the double facer portion 90A of the first embodiment is used.
And the microcapsules 30 are broken at the joint 92B. Other configurations and operations are the same as those of the first and fourth embodiments. Therefore,
Hereinafter, only the double facer unit 90B will be described with reference to FIG. Note that the same reference numerals as those described in FIG. 3 indicate the same or substantially the same portions, and thus detailed description thereof will be omitted.

Of course, also in the present embodiment, the glue 12a used in the gluing device (coating unit) 10A is made of high-concentration NaOH by the manufacturing method shown in FIG. 1 in the first embodiment.
It is composed of an NaOH-encapsulated microcapsule 30 in which a core material 27 of an aqueous solution is encapsulated, and a paste 7. In the present embodiment, as shown in FIG. 7, the film breaking device 37, the pressure roll 15, and the hot plate 13A in the first embodiment are removed.
A grid electrode 38 and a high frequency power supply 39 are provided. The use of the high-frequency electric field 40 for drying and heating the paste in the double facer section 90B is a conventionally known technique (for example, Japanese Patent Publication No. Sho 62-160232).

The NaOH-encapsulated microcapsules 30 contained in the paste 7a are connected to the high-frequency electric field 40 at the joint 92B.
Destroyed by That is, several units of (+) pole and (-) pole grid electrodes 38 are alternately installed at a certain angle with respect to the traveling direction (longitudinal direction) of the corrugated cardboard sheet 19, and supported by an insulator (not shown). A high-frequency voltage is applied from a high-frequency power supply 39 between the (+) pole and the grounded (-) pole to generate a high-frequency electric field 40, heat the paste 12a by dielectric heating, and dipole the substance in the NaOH microcapsules 30. The capsule is melted and destroyed by the heat energy generated by the vibration of the capsule.

By this destruction, the encapsulated high-concentration Na
OH flows into the surrounding glue 12 and causes a rapid chemical reaction, resulting in a glue 12b having a high NaOH concentration, and the gelation is promoted at a lower temperature. In addition, although the normal cotton belt 14 can be sufficiently insulated in the transport unit 91, an insulating belt may be used instead.

Since the present embodiment is configured as described above, a simpler configuration than that of the first embodiment makes it possible to effectively use NaOH without generating glue balls, as in the first embodiment. It is possible to increase the speed of the apparatus and promote the improvement of productivity. In particular, instead of the hot plate 13A and the pressure roll 15, a high-frequency electric field 40
The use of the device eliminates the necessity of devices such as the hot plate 13A and the pressure roll 15, so that the device of the double facer portion 80B can be simplified, and furthermore, the deformation of the corrugated cardboard sheet 19 due to the weight of the pressure roll 15 is prevented. Can be.

Further, using a high-frequency electric field 40, NaOH
Since the encapsulated microcapsules 30 are melted and broken, the glue 12b can be generated more reliably, and the joining can be completed in a short time. (F) Others Note that the present invention is not limited to the above-described embodiment, and can be implemented with various modifications of the embodiment without departing from the spirit of the present invention.

For example, the aforementioned microcapsules 30,
The particle size of 35 is defined by the particle size of the aqueous / oil / water emulsion 27B in FIG. 1 (b) and the water / oil / water emulsion 32B in FIG. 4 (b). The thickness of the film 35 is the same as that of the fine droplet 27a (water / oil emulsion) and the water / oil / water emulsion 27B formed in FIG. 1 or the minute droplet 32a (water / oil emulsion) formed in FIG. It is governed by the particle size difference of the aqueous / oil / aqueous emulsion 32B.

Therefore, the microcapsules 30, 35
Diameter and film thickness, and copolymerization ratio of styrene and acrylic,
It goes without saying that the film strength governed by the molecular weight may be adjusted so as to be suitable for the microcapsule breaking conditions. Also, the specific procedure of microencapsulation of NaOH and the materials used are not limited, and other procedures and materials may be used as long as NaOH can be microencapsulated.

Further, the purity, concentration,
Amount and even the microcapsule specifications (shape, dimensions, etc.)
Is not intended to limit numerical values and the like, but NaOH is sealed in a relatively high concentration state as compared with the ratio contained in the conventional paste. NaOH
The microcapsules are added to the starch paste in order to increase the curing speed of the paste and to lower the heating temperature. It goes without saying that the starch paste may already contain a normal amount of NaOH.

Further, the film of the NaOH microcapsules is very weak in terms of strength, and the method of breaking the film does not intentionally limit numerical values such as pressure, temperature, frequency and the like. Such means can also be applied.

[0092]

As described in detail above, in the method for manufacturing a paper product according to the first aspect of the present invention and the manufacturing apparatus according to the fourth aspect, high-concentration NaOH is sealed when paper is joined. After applying the glue mixed with the microcapsules, the microcapsules are stimulated to be broken, so that there is an advantage that the paper can be bonded with a glue having a high NaOH concentration without forming glue balls. In addition, since glue mixed with microcapsules containing high-concentration NaOH is used, gelation of the glue is rapidly promoted at the time of joining, and there is an advantage that the amount of heat required for drying is reduced. Further, when the heat amount is made equal to that of the conventional apparatus, the speed of the paper product manufacturing apparatus can be increased, so that there is an advantage that the production amount can be increased without changing the specifications of the conventional manufacturing apparatus.

In the method for manufacturing a paper product according to the second aspect of the present invention and the manufacturing apparatus according to the fifth aspect, when the core of the corrugated cardboard is joined to the liner, the microcontainer in which high concentration NaOH is sealed. By using the glue mixed with the capsule, the core of the cardboard and the liner can be joined with the glue having a high NaOH concentration without making glue balls, and the gelling of the glue is rapidly promoted at the time of joining. This has the advantage that less heat is required for drying. Furthermore, if the amount of heat is equal to the conventional one, the speed of the manufacturing equipment can be increased,
There is an advantage that the production amount can be increased without changing the specifications of the conventional cardboard manufacturing apparatus.

Further, according to the method for manufacturing a paper product of the present invention according to the third aspect and the manufacturing apparatus according to the sixth aspect, the pressure,
By applying a stimulus by any of heat, vibration, sound wave, and electric field, there is an advantage that the microcapsules can be surely broken immediately before joining. In addition, since the broken NaOH-encapsulated microcapsules react with the surrounding glue, gelling of the glue is rapidly promoted, glue balls can be more reliably prevented, and bonding is performed faster and more reliably. There is.

Further, according to the paper bonding glue of the present invention, since microcapsules containing NaOH at a high concentration are mixed therein, the gelation of the glue is promoted.
There is an advantage that glue can be applied to paper without causing a chemical reaction of aOH with the whole glue, and glue balls can be prevented. According to the method for producing a microcapsule of a paper bonding paste according to the present invention as set forth in claims 8 and 10, the first step of forming an aqueous / oil-based emulsion and the aqueous / oil-based emulsion are treated with NaOH.
A second step of adding an aqueous solution, mixing and stirring to form an aqueous / oil / aqueous emulsion composed of an aqueous NaOH / styrene / acrylic monomer / aqueous NaOH solution, and an aqueous NaOH solution containing the aqueous / oil / aqueous emulsion A third step of forming a thin film on the interface between the aqueous NaOH aqueous solution and the styrene / acrylic monomer phase of the aqueous / oil / aqueous emulsion by adding and stirring the additives therein; The styrene / acryl monomer is polymerized by heating the aqueous / oil / water emulsion to convert the styrene / acryl monomer phase of the water / oil / water emulsion from the liquid phase to the solid phase, and the inside of the styrene / acryl monomer phase And the fourth step of enclosing NaOH in the water. There is an advantage that it can be Rokapuseru of. In addition, the styrene-acrylic monomer phase and the outermost N
By forming a thin film at the interface with the aOH aqueous solution,
There is also an advantage that the encapsulated NaOH can be prevented from seeping out due to pinhole-shaped defects in the polymer film of the styrene / acrylic monomer phase. Furthermore, N
aOH aqueous solution / styrene / acrylic monomer / NaOH
Since the additive is added after forming the aqueous / oil / aqueous emulsion composed of the aqueous solution, there is an advantage that the thin film can be surely formed.

Further, according to the method for producing the microcapsules of the paper bonding paste of the present invention according to the ninth and eleventh aspects, the first step of forming an aqueous / oil-based emulsion,
The oil-based emulsion is added to the NaOH aqueous solution to which additives have been added, and the mixture is stirred and mixed with the NaOH aqueous solution / styrene.
A second step of forming a water-based / oil-based / water-based emulsion composed of an acrylic monomer / NaOH aqueous solution and having a thin film at the interface between the outermost phase NaOH aqueous solution and the styrene-acrylic monomer phase; Oil system /
The styrene / acrylic monomer is polymerized by heating the aqueous emulsion, and the styrene / acrylic monomer phase of the aqueous / oil / water-based emulsion is changed from a liquid phase to a solid phase.
Since the method includes the third step of enclosing H, there is an advantage that a high-concentration NaOH aqueous solution can be easily microencapsulated. Further, by forming a thin film at the interface between the styrene / acrylic monomer phase and the outermost phase NaOH aqueous solution, pinhole-shaped defects and the like in the polymerized film of the styrene / acrylic monomer phase caused Na-encapsulation.
There is also an advantage that OH can be prevented from seeping out. Further, the water-based / oil-based emulsion formed in the first step is added to an aqueous solution of NaOH to which additives have been added, and mixed and stirred to obtain a water-based / oil-based / water-based solution of NaOH aqueous solution / styrene / acrylic monomer / NaOH aqueous solution. Since an emulsion having a thin film in the outermost phase is formed, there is also an advantage that the process can be simplified and the microcapsule manufacturing operation becomes easy.

Further, according to the method for producing a microcapsule of paper bonding paste of the present invention according to the twelfth aspect, at the start of the first step, an aqueous NaOH solution to which a surfactant has been added in advance is mixed with a polymerization initiator and sebacoisil. It is configured to form a water-based / oil-based emulsion centered on fine droplets of an aqueous solution in a styrene-acrylic monomer by adding it to a styrene-acrylic monomer containing dichloride or methylcellulose, mixing and stirring. So NaOH
There are advantages that the diameter of the microdroplets of the aqueous solution can be easily adjusted and that the microdroplets can be stabilized.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining a method of manufacturing a NaOH-encapsulated microcapsule used in a sizing apparatus provided in a paper product manufacturing apparatus according to a first embodiment of the present invention, and FIG. The first step is shown, (b) shows the second step, (c) shows the third step, and (d) shows the fourth step.

FIG. 2 is a schematic diagram for explaining a single facer unit provided in the paper product manufacturing apparatus according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram for explaining a double facer unit provided in the paper product manufacturing apparatus according to the first embodiment of the present invention.

FIG. 4 is a schematic diagram for explaining a method of manufacturing a NaOH-enclosed microcapsule used in a sizing apparatus provided in a paper product manufacturing apparatus according to a second embodiment of the present invention. The first step is shown, (b) shows the second step, (c) shows the third step, and (d) shows the fourth step.

FIG. 5 is a schematic diagram for explaining a single facer unit provided in a paper product manufacturing apparatus according to a third embodiment of the present invention.

FIG. 6 is a schematic diagram for explaining a double facer unit provided in a paper product manufacturing apparatus according to a fourth embodiment of the present invention.

FIG. 7 is a schematic diagram for explaining a double facer section provided in a paper product manufacturing apparatus according to a fifth embodiment of the present invention.

FIG. 8 is a schematic diagram for explaining a single facer unit provided in a conventional paper product manufacturing apparatus.

FIG. 9 is a schematic diagram for explaining a double facer section provided in a conventional paper product manufacturing apparatus.

FIG. 10 is a schematic diagram for explaining a method for producing a paste used in a pasting apparatus provided in a conventional paper product producing apparatus, wherein (a) shows a step 1 and (b) shows the step 1; Step 2
And (c) shows the step 3.

[Explanation of symbols]

1A, 1B Step roll 1C Forming part 1D, 1E Step 2 Pressure roll 2a Surface 2A Joining part 3 Back liner 4 Middle core 4 'Core paper 4A, 8A Top 4B Bottom 5, 10, 5A, 10A Gluing device (coating unit) 5a, 10a Container 6A, 6B, 11A, 11B Glue roll 6a, 6b, 11a, 11b Peripheral surface 6C, 11C, 70, 110 Contact part 7, 12 Glue 7a, 7b, 12a, 12b Glue (microcapsule-mixed glue) 8 Single-sheet sheet 8A Top 8B surface 9 Front liner 13, 13A Hot plate 13a Upper surface 14 Cotton belt 14a Outer surface 14b Inner surface 15 Pressing roll 16, 17, 18 Conveying roll 19 Corrugated cardboard (corrugated cardboard) 20, 20A, 20B Water 21, 24 Starch 21A Pasty starch 21B, 24A Solution 22, 27A, 32A NaOH aqueous solution 22A NaO 23 Borax 26,31 Styrene / acrylic monomer 26a Sevacoisyl dichloride 27,32 Core substance (NaOH) 27a, 32a Microdroplet 27B, 32B Water / oil / water emulsion 28 Hexamethylenediamine 29 Nylon thin film 30,35 NaOH sealing Microcapsules 31a Methylcellulose 33 Tannin 34 Methylcellulose thin film 36,37 Film breaking device 38 Lattice electrode 39 High frequency power supply 40 High frequency electric field 50a, 50b, 50c, 50d Styrene / acrylic monomer phase 80, 80A, 80B Single facer section 90, 90A, 90B , 90C Double facer section 91 Transport section 92, 92A, 92B, 92C Joining section 92a Joining start section 92b Exit side

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E078 BB03 CC06 CC12 CC23X CC42 CC62 4J040 HA146 KA02 KA11 MA09 NA07 PA29 PA30 PA32 PA33 PB08

Claims (12)

[Claims] 1. A paper product manufacturing method for manufacturing a paper product by bonding papers using a glue, wherein the microcapsules containing a high concentration of NaOH are mixed in the glue. A coating step of applying the glue to the bonding portion of the paper; and a bonding in which the glue applied in the coating step is externally stimulated to break the microcapsules mixed in the glue and bond the paper. It is characterized by having a process
Manufacturing method of paper products. 2. The method for producing a paper product according to claim 1, wherein the paper product is a cardboard, and in the joining step, the core of the cardboard and a liner are joined. 3. The bonding step is characterized in that the microcapsules are destroyed by applying a stimulus to the paste applied in the applying step by any of pressure, heat, vibration, sound wave, and electric field. The method for producing a paper product according to claim 1 or 2, wherein 4. A paper product manufacturing apparatus for manufacturing a paper product by bonding papers using glue, wherein microcapsules containing NaOH in a high concentration are mixed into the glue. An application part for applying the adhesive to the bonding portion of the paper; and a bonding for applying the externally applied stimulus to the adhesive applied by the application part to break the microcapsules mixed in the adhesive and to bond the paper. It is characterized by having a department
Equipment for manufacturing paper products. 5. The paper product manufacturing apparatus according to claim 4, wherein the paper product is a cardboard, and the core of the cardboard and the liner are joined at the joint. 6. The microcapsule is destroyed by applying a stimulus to the adhesive applied by the application unit by any one of pressure, heat, vibration, sound waves, and an electric field. The paper product manufacturing apparatus according to claim 4, wherein: 7. A glue used for bonding paper, comprising NaOH
Characterized in that microcapsules containing a high concentration of are mixed therein. 8. A method for producing microcapsules mixed into a paper bonding paste, comprising adding an aqueous solution of NaOH to a styrene / acrylic monomer containing a polymerization initiator and sebacoisyl dichloride, and mixing and stirring the styrene.・ NaOH in acrylic monomer
A first step of forming an aqueous / oil-based emulsion centered on fine droplets of an aqueous solution, and forming the aqueous / oil-based emulsion formed in the first step with N
a second step of adding an aqueous aOH solution, mixing and stirring to form an aqueous / oil / aqueous emulsion composed of an aqueous NaOH / styrene / acrylic monomer / aqueous NaOH solution, and the aqueous / aqueous emulsion formed in the second step. Hexamethylene diamine is added to the aqueous NaOH solution containing an oil / water emulsion, and the mixture is stirred and mixed to form the aqueous / oil / water emulsion.
A third step of forming a nylon thin film on the interface between the aqueous NaOH aqueous solution and the styrene / acrylic monomer phase as the outermost phase of the aqueous emulsion; and heating the aqueous / oil / water emulsion formed in the third step. A fourth step of subjecting the styrene / acrylic monomer to a polymerization reaction to convert the styrene / acrylic monomer phase of the aqueous / oil / water-based emulsion from a liquid phase to a solid phase and enclosing the NaOH inside the styrene / acrylic monomer phase And a method for producing microcapsules of paper bonding paste. 9. A method for producing microcapsules mixed into a paper bonding paste, comprising adding an aqueous NaOH solution to a styrene / acrylic monomer containing a polymerization initiator and sebacoisyl dichloride, and mixing and stirring the styrene.・ NaOH in acrylic monomer
A first step of forming an aqueous / oil-based emulsion centered on microdroplets of an aqueous solution, and the aqueous / oil-based emulsion formed in the first step is:
It is added to an aqueous solution of NaOH to which hexamethylene diamine is added, and mixed and stirred to obtain an aqueous solution of an aqueous NaOH solution / styrene / acrylic monomer / aqueous NaOH solution / oil system /
A second step of forming a water-based emulsion having a nylon thin film at the interface between the outermost NaOH aqueous solution and the styrene-acrylic monomer phase; and the water-based / oil-based / water-based formed in the second step. The styrene-acrylic monomer is polymerized by heating the emulsion, and the styrene-acrylic monomer phase of the aqueous / oil-based / water-based emulsion is changed from a liquid phase to a solid phase. And a third step of encapsulating the paper bonding paste. 10. A method for producing microcapsules to be mixed into a paper bonding paste, comprising adding an aqueous solution of NaOH to a styrene / acrylic monomer containing a polymerization initiator and methylcellulose, mixing and stirring, and mixing and stirring the styrene / acrylic monomer. A first step of forming an aqueous / oil-based emulsion centered on minute droplets of an aqueous NaOH solution, and the aqueous / oil-based emulsion formed in the first step,
A second step of adding an aqueous NaOH solution, mixing and stirring to form an aqueous / oil / aqueous emulsion composed of an aqueous NaOH / styrene / acrylic monomer / aqueous NaOH solution; and forming the aqueous / oil-based emulsion formed in the second step. Tannin is added to the aqueous NaOH solution containing the oil-based / water-based emulsion, followed by mixing and stirring, whereby methylcellulose is added to the interface between the aqueous NaOH aqueous solution and the styrene / acryl monomer phase of the outermost phase of the water-based / oil-based emulsion. A third step of forming a thin film; and heating the aqueous / oil / aqueous emulsion formed in the third step to cause a polymerization reaction of the styrene / acrylic monomer, thereby forming the aqueous / oil / aqueous emulsion. The styrene-acryl monomer phase is changed from a liquid phase to a solid phase, and the NaOH is placed inside the styrene-acryl monomer phase. 4, characterized in that it is composed of a step, microcapsules method for producing a cement for paper bonded to enter. 11. A method for producing microcapsules mixed into a paper bonding paste, comprising adding an aqueous NaOH solution to a styrene / acrylic monomer containing a polymerization initiator and methylcellulose, mixing and stirring, and mixing and stirring the styrene / acrylic monomer. A first step of forming an aqueous / oil-based emulsion centered on minute droplets of an aqueous NaOH solution, and the aqueous / oil-based emulsion formed in the first step,
Add into tannin-added NaOH aqueous solution, mix
Stir to form an aqueous / oil / aqueous emulsion consisting of an aqueous NaOH / styrene / acrylic monomer / aqueous NaOH solution having a methylcellulose thin film at the interface between the outermost aqueous NaOH solution and the styrene / acrylic monomer phase. Heating the aqueous / oil / water emulsion formed in the second step to cause a polymerization reaction of the styrene / acrylic monomer to form the styrene / acrylic monomer in the water / oil / water emulsion. And a third step of converting the phase from a liquid phase to a solid phase and enclosing the NaOH in the styrene-acrylic monomer phase. 12. The method according to claim 1, wherein a surfactant is previously added to the aqueous NaOH solution used in the first step.
A method for producing a microcapsule of the paper bonding paste according to any one of claims 8 to 11.