JPS6084370A - Adhesive for production of corrugated cardboard - Google Patents

Abstract

PURPOSE:To provide the titled adhesive which can laminate corrugated cardboards with good adhesion at a high speed and requires a less quantity of heat in the lamination, consisting of a paste soln. contg. a cooking product of a processed corn starch. CONSTITUTION:Corn starch having an amylose content of at least 35wt% is treated with a mineral acid or an org. acid to form an acid-treated corn starch which is then reacted with acetic anhydride to esterify the starch. The resulting ester is reacted with propylene oxide to etherify it. The resulting processed starch is dispersed in water and gelatinized by a direct heating system by steam blowing to produce an adhesive for use in the production of corrugated cardboards, which is composed of a paste soln. having a starch content of 20- 50wt% and a viscosity (85 deg.C) of 50-2,000 Brabender unit.

Description

[Detailed Description of the Invention] (Field of Industrial Application) This study relates to starch-based adhesives used in the production of 7-column sails, and more specifically, to measure the energy saving ratio of the corrugated board manufacturing process. This invention relates to a starch-based adhesive that increases the speed of base paper lamination and improves the quality of the product.

(Prior art) In the past, starch-based adhesives commonly used in the production of corrugated board were produced by a Nby method called the Stinhall method, in which an alkali-gelatinized starch side liquid called a carrier part and a main part were formed. It consists of a mixture with a suspension of unwooded wood powder. The bonding mechanism of this adhesive is basically that it is heated during the initial stage of lamination. -C
The purpose is to evaporate water and create a stronger bond by drying.

Therefore, when using such an adhesive,
Thermal energy consumption during the lamination process is extremely high.

In particular, in the corrugated board bonding process called double facer, in order to heat the corrugated paper coated on the top of one tier, the liner must be eilned and straightened, and a considerable amount of heat is spent only on heating the liner. The state is such that only a small amount of the added heat serves to glue the starch in the main part. In addition, when producing double-sided corrugated board, heating is required throughout one stage, so the heat loss becomes even more significant. Therefore, with such adhesives, indirect heating is performed through the medium, resulting in a low heat conduction rate and slow lamination speed, and the production speed of corrugated sel is limited to 1/2 to 2/3 of the maximum machine speed. has been done. On the other hand, with such an adhesive, it is inevitable that the paper becomes wet due to the applied heat and water, so there are manufacturing disadvantages such as the occurrence of wrinkles in the corrugated cardboard sheet.

In the corrugated board industry, there has been a strong desire to solve the above problems due to the energy crisis caused by the oil shock, and the development of energy-saving adhesives that can be bonded without the need for heating has become a major issue.

In recent years, from the perspective of energy conservation, a method called a cold corrugation system, in which corrugated cardboard is formed without using heat, and a starch-based adhesive that does not require heating during the lamination process (U.S. Patent No. 3.30 fJ,
360) was developed. A feature of this starch-based adhesive is that it is made of a homogeneous starch paste that does not contain j-based powder. This starch-based adhesive scraping adhesion mechanism works by applying an adhesive kept at high temperature and low viscosity to the corrugated top of the core base paper at room temperature, and then drying the liner base paper, which progresses at the same time as the adhesive increases in viscosity due to natural cooling. It is about layering. Therefore, if this starch-based adhesive is used for manufacturing corrugated board, heating can be completely omitted in the corrugated board bonding process. However, the setting speed of this adhesive is very slow, and not only is it difficult to obtain a sufficient lamination speed, but when laminating double facer [1111], the adhesive force cannot withstand the impact of passing through a slitter scorer, resulting in peeling. It's a box, but it's not in the practical stage.

(Objective of the Invention) The present inventors have overcome the current state of adhesives for manufacturing corrugated board as described above, and aim to greatly reduce the number of paths required in the manufacturing process of corrugated board, and improve the lamination of double facers. In addition, the present invention was constructed with the object of obtaining a starch-based adhesive for manufacturing corrugated board, which has excellent setting properties, and provides sufficient lamination speed and corrugated sheet quality.

(Composition of Kaimei) Book! Irumeyo, esterification of rLχ-treated corn starch with an amylose content of 35 q6 or more, or
A stage characterized in that the viscosity of the cooked starch obtained by processing the ether ratio to 1i is 94,120 to 50 tons, and one viscosity is 50 to 2,000 gravender units in the temperature range of 85°C. Chill with hole manufacturing adhesive.

(1 starch)) Used for non-invention 15 (1 starch contains ゛f o-su iJ 35
High amylose of 1 or higher and ν morikoshi can be used for ton.

1 [Amylose corn girl dressing is usually made with sweet potato, 5 kernels and D powder (amylose corn is about 25%) in order to bypass a lot of direct molecules (amylose) that make up starch grains. In comparison, it has characteristics such as easy aging, strong film strength, and strong adhesive strength.

High amylose and sorghum starch with such caustic properties are extremely popular as raw materials for inventive adhesives.

((Acid treatment recipe) Remei provides a thread-reducing TD4 agent with good setting properties that does not require heating during corrugated board making. In order to improve j4, it is necessary to have a smoothness. 9. And cardboard pasting 1
The world's VC application theory is that it is invasive to cause the emergency e-set to occur. Tsuzumi,・'V, Ll in the back passage of Kodan Hall
Since the slitter score is applied with a double facer, the adhesive Q setting property is extremely heavy.
perform.

Therefore, the temperature of 64 degrees Celsius is 61, and all the ingredients are the same. Therefore, in this article, we consider suitable raw materials for 7L rutto. Rirui eyu 9m yield: Treated with organic i-waves such as dazzling, starch 6%: 3 () heavy JJL staff (adjusted to pH +2 with 25 injections) 1.5' from 25°C C/min rise, 95
1 cup of Flaventer at ℃ is 50~20001LU
, starch is suitable. The viscosity of acid treatment reduction is 2 (100H
, U, or higher, the aging is high and the fluidity is lost and the juice becomes good.7
Not. Also, when the viscosity is 5013 or more, the adhesive strength is lower, but the starch becomes amylodextrin, becomes brittle when dried, and the adhesive strength is weak <5 m.
There is a short 79F where 1t humidity is also poor.

((Ether ratio to ester r)) As mentioned in ii1, high amylose corn starch contains a large amount of linear molecule amylose, so the 4Mj solution is generally said to have a large amount of linear molecule amylose. Redistribution 1j
%, that is, it is likely that one old person will be born once. This old rs
&, J, t/r4 +& , depends on the temperature, so
Even if high amylose and 9% sorghum starch are used as adhesives for commercially viable shaving liquids such as those of the present invention, they have the disadvantage of aging and a very short adhesive life. .

The present inventors developed acid-treated high amylose corn Lllll
By treating 1 with ester ratio or ether ratio and introducing substituents, the aging of 1% acid-treated high amylose and 9 sorghum starch can be appropriately suppressed, resulting in an excellent size solution life that is long and short on open time. It has been found that it is possible to make 8R starch-based adhesive that has good setting properties and angles.

The starch used in the present invention has a viscosity of 50H, U, according to a specified measurement method.
Reacting acid-treated high amylose corn starch with ~2,0001 U, U (H, U, stands for plaventur unit) with M organic acids such as acetic acid, propionic acid, butyric acid, succinic acid, maleic acid, phthalic acid, etc. Ester Hikuko powder obtained by
Phosphate ester starch, or acid-treated amylose corn starch, can be added to hydroxymethyl, hydroxyethyl, hydroxyproyl, carboquine methyl, carboquinethyl, 2-amine ethyl needles, primary amine needles, tertiary aminoalkyl ethers, 4 ammonium uno,
6 with starch compared to ether such as argyl ether.

Furthermore, acid-treated high amylose corn starch crosslinked with a crosslinking agent such as tritutallic acid or epichlorohydrin can also be used. These starches preferably have a D degree of 20.
~50 heavy assets, 50 ~
2 o o 013. U, preferably 100-1000
1 LU, the degree of substitution is (1.01 to 0.7) as an esterification/Eralization test.The degree of substitution is o, o i or less, and the number of introduced groups is small, which is not sufficient to suppress aging. In addition, (J, when it becomes 7 or more, it becomes high 1111M, which seems to be to prevent the entanglement of linear molecules, but it does not suppress aging,
When the centripetality deteriorates, a cracking phenomenon occurs.

((Preparation of Adhesive)) Method A of the starch-based adhesive of the present invention involves diluting a fraction of the acid-treated high amylose corn starch esterified or ether-treated starch in water to give a starch concentration of 20 to 50 @.
The leftover suspension is heated using any heating method, either direct heating with steam blowing like a jet cooker or indirect heating with a jacket like a high-pressure cooker. 2t) ~50 car j [L temperature 85℃ viscosity is 50 B, U, ~20
00110. Preferably 10) to 10001-1. Fully adjusts skin temperature and high concentration of sap.

In the present invention, in order to make the sticky properties of starch more solid, an alkali such as caustic soda may be added to pIIA'ffff, depending on the requirements.

However, if the pH is set to 11.0 or higher, care must be taken as the alkali will cause deterioration.In addition, borax,
A gel ratio promoter such as fjll+acid can also be used in combination. Still, it's a side cost reduction/kome, clay.

Fillers such as bentonite and calcium carbonate can also be added.

((A degree and viscosity of adhesive)) Starch concentration in the starch adhesive of the present invention (d is preferably 20 to 50% by weight. This is because the 1-water adhesive is laminated with a homogeneous size liquid that has been gelatinized by steaming. It is applied to the surface and adhered without heating the edges, so there is no water dissipation.

This is because instantaneous solidification is an essential condition, so a highly concentrated paste solution is required. When gluing the double facer side of the cardboard, the nip pressure between the corrugating roll and the press roll moves effectively, so it can be bonded with a size liquid of 20 layers, but when gluing the double facer 1fill, It is advantageous in production because it has no pressing effect and the lamination speed can be increased due to the sludge, sludge (higher Ryoichi Minoru, water loss, and solidity).However, the i temperature When the temperature exceeds 50%, the adhesive strength becomes weak and brittle when dried, as there is one coat per coat.
The drawback is that it also has poor moisture control properties.

As mentioned above, this adhesive bond 13 m4 degree iI
i, add 20 to 5OX = chi as necessary.

Manufactured treatment a7 j'41J [/) viscosity eyu, at a measurement temperature of 85°C, 50-2 (JOυ13. (). Preferably 100-l tl (l f) lJ, U, t/) Silabender viscosity I'll lend you one soul to make it happen.

Naturally, the adhesive viscosity is within the relative range of starch Ia, acid treatment, and ether nitrate ratio during cooking, and in order to obtain the designed adhesive viscosity, various manufacturing conditions must be selected appropriately. Just shift it.

(How to use the adhesive) With this adhesive, the adhesive is maintained at a specified temperature and applied to the bonding surface of the cardboard, and the bonding between the liner and core paper is completed through natural action and concentration of the size liquid. As a result of this cooling and concentration, the p-starch and peppercorns rapidly solidify and develop a strong adhesive force. The degree of application is as follows:
In order to burn the paper surface, to maintain good wettability and permeability, and to maintain the usable viscosity, it is also 7uc to 95 when considering the workability.
°C is preferred.

In addition, during lamination, the moisture content of the base paper used also affects the lamination suitability VC, and the lamination bonding and setting properties are improved by keeping the base paper moisture low and using the adhesive of the present invention, as the silver effect appears, This investigation is further revised.

Preferably, the base paper moisture content is 4 cm or more.

(Implementation IZ!I) In order to make it easier to understand the contents of this meeting, we will introduce the following
ii Examples and comparative columns are shown and specifically explained - J'', but
The implementation sequence in f is not intended to limit the total amount of this invention.

Implementation 11-1 Donation Door Sho 7 Milose and 9 Corn Starch (Starch 113U Nail M% (Adjusted to Pi 112) 1.5U Temperature Increase 95% Noshi Bender Viscous 22 OB, Ll,) 450kg to 2
1. Disperse in 5℃ water fi 8 fJ t. Pi-18・0. Add 100 kg of glacial acetic acid and continue stirring for 1 hour, then add hydrochloric acid to pif5, OK medium, dehydrate, wash with water, dry and replace with 1λ [(L)S) U. 4 acetic acid + 74i)
5) was obtained. The molecule i'1. Now, after the construction of the powder, the 1st part of the 35th car memorial service was read 12 times, and this glaze was boiled at 140'C in an indirect heating continuous submergence device. 35 Tsuku adhesive for nail area Hei/ζ. The viscosity of the adhesive is l crystal rsy 85 x: to,! ,・Brabender viscosity is 25013, U, Derotsu/
child.

1st position 1j-J Use this adhesive to make a single-sided step pole (H-220X +'
(IJ P I 25) and liner (IJ-220)
pasted together and covered with double-sided cardboard / Kokoro% 1
Lamination was possible at a speed of 30 r+t/min.

Example-2 The acid-treated high amylose corn powder of Example-1 was dispersed in water, and a 38-ml suspension of gamma-shu liquid was prepared. 4 parts of sodium chloride for starch and 1 part for starch f)
, 85% caustic soda (in a 3% aqueous solution) was added, and propylene oxide with a ratio of 12% to starch was added, and the mixture was reacted for 5 hours in a closed reactor at a reaction temperature of 45°C, and the mixture was reduced to pL 16.0 with concentrated hydrochloric acid. After soaking, washing with water, dehydration, and drying to reduce the degree of substitution to 0.
, 25% of hydroxynorobil starch. This hydroxynorobil starch was applied to indirect heating continuous glue 1 in the same manner as in Example-1.
The paste was cooked in Step 11 and adjusted to pH 8.5 with 25 grams of caustic soda, with a total solid content of 35 grams and a Brabender viscosity of 24,011 U at a temperature of 85°C.

of adhesive was obtained.

Usage row-2 As in usage example-1, double-sided corrugated board was produced using Dazzle Fazer, which does not apply heat at all (+IJi), and was able to be laminated at a speed of i3 om/min.

Control example-1 Actual (14 Example-1 acid treatment 8! A amylose, pork and rice starch was indirectly heated in a continuous pile control process, and the paste was cooked to give a 25% acidity.
Adjusted to +1118.8 with death node, total 11 questions 3
A lavender adhesive having a lavender viscosity of 28013.U at 35° C. was obtained.

Using this adhesive, double-sided corrugated board was produced in the same manner as in Use Example 1 (I double phaser), but the oil solution I could not be pasted with the gel.

These results are shown in Ibara-1.

Table-1 ※Crystal pasting speed: Peel off the Q cardboard sort θ pasted state by hand with the cutter tip and judge whether it is ``No'' or ``No'', enough pasting is done, and no peeling occurs. This is the fastest lamination speed.

※※Fall vortex: Enzyme component) 9 by def method.

* m 3i4 'ノj'a 1m Ws-'iii
'j'j<degree: Based on JIS-Z-++402, six rivers are determined.

※Using hydroxyglobil starch with IM V=1-2,
:'a623 nails'j'c tfLL, 771 parts of clay 22J1, 55 parts of water, 6ii1 sand 0, 46 ff
i tut M'j tut-
1 and co-worker Tsubaki] Cooked with 30% caustic no-da water m
ifL-CpIHI: 9, tj'''l'4 to 9
¥1, p Ii'J Iltl approx.

1 length) = IJ υ - 1] Kori contact, Tl'l! If I is ノ('', same as 1 four-phase series-1), the shore k '1 < inn is not Dagrun A V-
When double-sided corrugated holes were prepared in one step, lamination was possible at a speed of 135 m/min.

Execution I9+1-4 Execution 11-2 of Pidroquine zorobil's concentrated dust; , implement al as in jl-1
25 nails cooked! Adjust the pH to 1.0 with #t% bamboo sorter aqueous solution and mix about 31 nails for all 7 shapes, q-type I + f, l-7, H person Gorabeso A゛-→.
ll-111σ) I borrowed the shoulder MIJ.

1 History - 4 Double-sided corrugated cardboard was manufactured in the same manner as in Example 1 using this V adhesive, and lamination was possible at a speed of 130 ηl/min.

(Effects of the Invention) The Mizumotori Seifun Yarn Adhesive was able to be laminated using a heating method of 1μ4, the lamination speed was as fast as can be used in English, and the adhesive strength was sufficient. Nothing in history/Jl fever and starch liquid;
Due to the 1-zoom differentiation, it is possible to produce a hole route with high image quality without the problem of warping caused by p1 heat and water.

Patent Applicant Oji Cornstarch Co., Ltd. 1 Representative Patent Attorney Kao Isaka Procedural Amendment January 14, 1985 Manabu Shiga, Commissioner of the Japan Patent Office 1 Indication 1111 W58 Patent Application 192475 No. 2, Name of the invention: Adhesive for making corrugated holes 3, Relationship with the person making the amendment +'1 Patent applicant name: Ueko Cornstarch Co., Ltd. (and one other person) 4. Agent address: Nishi, Minato-ku, Tokyo Shinbashi 1-21-11 Voluntary amendment within Ono Hill 8, fi Q7 of the invention increased by the amendment, Detailed description of the invention column of the specification subject to amendment 'H60, 1, 141 (1) Specification No. 9 "Adjustment" in the 12th line of the page is corrected to "preparation".

(2) "Sei" in the third line of page 10 of the same book is corrected to "sei".

(3) Change “Comparative Example” in the fourth line from the bottom of page 12 of the circular to “
Comparative example”.

(4) "1.5°C" in the second line of page 13 of the same book is changed to "1.5°C".
5°C/min”.

(5) "Adjustment" on page 13, line 10 of the same book, page 14, line 5, and page 17, line 5 from the bottom, are respectively amended to "preparation."

(6) Same book, page 14, line 6, same page, line 13, lines 11-14
"Row I", "Sorter" in the fourth line 1'1 of page 15 and in the third line from the bottom of page 17 are corrected to "Sorter".

(7) The following is added on page 15, line 11 of the same book:

1r vs. 119 cases-2 Dissolve 450 kg of high amylose corn starch (amylose content 70%) in 650 g of warm water at 40°C, and add a 3% aqueous solution of caustic soda to pH 11.0.
Hypochlorous acid sorter 13 with 13% available chlorine while adjusting to
5M was added thereto, stirring was continued at 40°C for 4 hours, and then the pH was neutralized by 5.0i with hydrochloric acid, followed by washing with water, dehydration, and drying to obtain oxidized high amylose corn starch.

This thickened high amylose corn starch was cooked in an indirect heating continuous gelatinization device in the same manner as in Example-1 to obtain an adhesive with a pH of 8.0, a solid content of 34%, and a Brabender viscosity of 21OB, U. Ta. A double-sided corrugated board was manufactured using this adhesive using a tuple facer in the same manner as in Use Example 1. Lamination was possible at a speed of 90 m/min, and when the speed was increased beyond this point, peeling occurred at the cutter tip. These results are shown in Table-1. ” (a) Itlily: “Table 1” on page 16 is attached [Table-1]
1 (Part 1) and Table 1 (Part 2)].

(9) Set [1°0] in the second line from the bottom of page 17 of Dosen to
l Add O, OJ.

Table-1 (Part 1) Table-1 (Part 2)

Claims (1)

[Claims] ■ Amylose content: Steamed processed starch of acid-treated corn starch with a weight of 35 or more. An adhesive consisting of a steamed paste liquid as an active ingredient, and the adhesive is a paste liquid. 50 at 0 degrees 20-50% by weight, temperature If 85 C
An adhesive for manufacturing corrugated board characterized by having a viscosity of ~2,000 plastic adhesive units. 2. The adhesive according to claim 1, which is a processed starch of the acid treatment and 9 sorghum starch, or a starch treated with an ester ratio or an ether ratio. , 3. The catfish adhesive according to claim 2, wherein the ester ratio or the degree of etherification is 0.01-0.7.