JP4527972B2 - Heat-saving adhesive for bonding - Google Patents
Heat-saving adhesive for bonding Download PDFInfo
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- JP4527972B2 JP4527972B2 JP2003425192A JP2003425192A JP4527972B2 JP 4527972 B2 JP4527972 B2 JP 4527972B2 JP 2003425192 A JP2003425192 A JP 2003425192A JP 2003425192 A JP2003425192 A JP 2003425192A JP 4527972 B2 JP4527972 B2 JP 4527972B2
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- adhesive
- starch
- bonding
- urea
- corrugated cardboard
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- 239000000853 adhesive Substances 0.000 title claims description 118
- 230000001070 adhesive effect Effects 0.000 title claims description 116
- 229920002472 Starch Polymers 0.000 claims description 74
- 235000019698 starch Nutrition 0.000 claims description 73
- 239000008107 starch Substances 0.000 claims description 72
- 238000000034 method Methods 0.000 claims description 35
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 34
- 239000004202 carbamide Substances 0.000 claims description 34
- 229920002261 Corn starch Polymers 0.000 claims description 26
- 239000008120 corn starch Substances 0.000 claims description 25
- 239000000123 paper Substances 0.000 claims description 12
- 229920000881 Modified starch Polymers 0.000 claims description 6
- 239000004368 Modified starch Substances 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 6
- 235000019426 modified starch Nutrition 0.000 claims description 6
- 238000010030 laminating Methods 0.000 claims description 4
- 230000000052 comparative effect Effects 0.000 description 28
- 239000003513 alkali Substances 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 238000004519 manufacturing process Methods 0.000 description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000002585 base Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 8
- 238000002156 mixing Methods 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 238000000691 measurement method Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 229920001807 Urea-formaldehyde Polymers 0.000 description 3
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 3
- -1 ammonium ions Chemical class 0.000 description 3
- 150000001639 boron compounds Chemical class 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 229920001592 potato starch Polymers 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 229910021538 borax Inorganic materials 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000032050 esterification Effects 0.000 description 2
- 238000005886 esterification reaction Methods 0.000 description 2
- 238000006266 etherification reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000004328 sodium tetraborate Substances 0.000 description 2
- 235000010339 sodium tetraborate Nutrition 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 1
- 229920000856 Amylose Polymers 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 244000017020 Ipomoea batatas Species 0.000 description 1
- 235000002678 Ipomoea batatas Nutrition 0.000 description 1
- 244000178870 Lavandula angustifolia Species 0.000 description 1
- 235000010663 Lavandula angustifolia Nutrition 0.000 description 1
- 240000003183 Manihot esculenta Species 0.000 description 1
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 229910001860 alkaline earth metal hydroxide Inorganic materials 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 238000009960 carding Methods 0.000 description 1
- NCEXYHBECQHGNR-UHFFFAOYSA-N chembl421 Chemical compound C1=C(O)C(C(=O)O)=CC(N=NC=2C=CC(=CC=2)S(=O)(=O)NC=2N=CC=CC=2)=C1 NCEXYHBECQHGNR-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000001102 lavandula vera Substances 0.000 description 1
- 235000018219 lavender Nutrition 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229940116317 potato starch Drugs 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229940100486 rice starch Drugs 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 235000010413 sodium alginate Nutrition 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
- 229940005550 sodium alginate Drugs 0.000 description 1
- NVIFVTYDZMXWGX-UHFFFAOYSA-N sodium metaborate Chemical compound [Na+].[O-]B=O NVIFVTYDZMXWGX-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000001648 tannin Substances 0.000 description 1
- 235000018553 tannin Nutrition 0.000 description 1
- 229920001864 tannin Polymers 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 229940100445 wheat starch Drugs 0.000 description 1
Landscapes
- Adhesives Or Adhesive Processes (AREA)
- Laminated Bodies (AREA)
Description
本発明は、段ボールのライナーと中芯との貼合に用いる段ボール貼合用接着剤及びそれを用いて製造される段ボールに関する。詳しくは、糊化が一気に完了する特性を付与した改質澱粉を使用する省熱貼合適性に優れた段ボール貼合用接着剤、並びにそれを用いて製造される段ボールに関する。なお、ここでいう省熱貼合適性とは、高速貼合や低温貼合など、コルゲーターから受けることのできる熱量が抑制される貼合の状況においても、生産性を落とさずに、十分な接着強度を有する段ボールの製造が可能となる接着剤の貼合適性を指す。 The present invention relates to a corrugated cardboard bonding adhesive used for bonding a corrugated cardboard liner and a core, and a corrugated cardboard produced using the same. More specifically, the present invention relates to an adhesive for corrugated board bonding, which is excellent in heat-saving laminating suitability, using a modified starch imparted with the property that gelatinization is completed at once, and a corrugated board manufactured using the same. In addition, heat-saving bonding suitability here means sufficient adhesion without reducing productivity even in the situation of bonding where the amount of heat that can be received from the corrugator is suppressed, such as high-speed bonding and low-temperature bonding. It refers to the bonding suitability of an adhesive that enables the production of corrugated cardboard having strength.
段ボールの貼合に用いる接着剤の原料としては、安価なことから澱粉を使用することが多い。澱粉を使用する接着剤は、一般的に水、キャリアと呼ばれる糊化した澱粉、未糊化のメイン澱粉、アルカリ化合物、硼素化合物で構成される。 As a raw material for the adhesive used for bonding cardboard, starch is often used because of its low cost. The adhesive using starch is generally composed of water, gelatinized starch called carrier, ungelatinized main starch, alkali compound, and boron compound.
段ボール製造機械であるコルゲーター上で接着剤は、波形に成形された中芯の段頂に塗布された後、ライナー原紙を介して熱板より熱が加えられることで、接着剤中の澱粉が糊化・乾燥され、接着力を発現して、段ボールが製造される。 On the corrugator, which is a corrugated board manufacturing machine, the adhesive is applied to the top of the corrugated core, and then heat is applied from the hot plate via the liner base paper, so that the starch in the adhesive is glued. Corrugated cardboard is produced by developing and drying and developing adhesive strength.
段ボール製造に使用されるコルゲーターは、一般的に熱板の温度が１８０〜１９０℃となるようにするため、蒸気圧１．０〜１．２ＭＰａの蒸気を通して使用されている。しかし、１８０〜１９０℃といった高温で貼合を行うと、熱板と直接接しているライナー原紙の水分が急激に蒸発されるため、原紙が伸縮し、段ボールシートが変形する『反り』と呼ばれる現象が発生する。段ボールシートの反りには、上反り、下反り、Ｓ字反り等があり、その矯正には、大変な労力と経費が費やされている。更に反りは、シートを箱に成形する製函ラインでの生産性を大幅に下げるとともに、不良品発生原因となっており、大きな問題となっている。このため、段ボール製造にあたっては、反りのない段ボールを製造することは、大きな課題となっている。 Corrugators used for corrugated board production are generally used through steam having a steam pressure of 1.0 to 1.2 MPa so that the temperature of the hot plate becomes 180 to 190 ° C. However, when bonding is performed at a high temperature of 180 to 190 ° C., the moisture of the liner base paper that is in direct contact with the hot plate is rapidly evaporated, so that the base paper expands and contracts and the cardboard sheet deforms, a phenomenon called “warping” Will occur. The warpage of the cardboard sheet includes an upper warp, a lower warp, an S-shaped warp, and the like, and much labor and cost are spent for correcting the warpage. Further, warpage is a major problem because it significantly reduces the productivity of a box making line for forming a sheet into a box and causes defective products. For this reason, in the production of corrugated cardboard, producing corrugated cardboard without warping is a major issue.
しかし、段ボール原紙は、その製造条件、メーカー等により、水分、パルプ繊維の配向性等に微妙な差があるため、熱や水分による伸縮にも微妙な違いが生じている。段ボール製造にあっては、その裏と表のライナー原紙の伸縮に差が生じると、製造した段ボールに反りが発生する。このような原紙伸縮の差による反りの発生は、貼合時のコルゲーターの熱板の温度を低く抑え、ライナー原紙の水分蒸発を抑制することにより、緩和されることが経験的に確認され、コルゲーターから与える熱量を低く抑えて貼合を行う低温貼合は、反り発生の抑制効果を期待できることが明らかになってきた。更に、低温貼合は、コルゲーターの熱量を低く抑えるため、エネルギー消費量が抑制でき、燃料コストの削減、二酸化炭素排出削減などの効果も期待できる。このような背景を受けて、低温貼合への関心が大きく持たれるようになっている。 However, since corrugated cardboard has a subtle difference in moisture, orientation of pulp fibers, etc., depending on its manufacturing conditions, manufacturer, etc., there are subtle differences in expansion and contraction due to heat and moisture. In the production of corrugated cardboard, if there is a difference in expansion and contraction between the back and front liner base paper, the produced corrugated cardboard is warped. It has been empirically confirmed that the occurrence of warping due to the difference in expansion and contraction of the base paper is mitigated by suppressing the temperature of the corrugator hot plate during bonding and suppressing moisture evaporation of the liner base paper. It has been clarified that low-temperature bonding in which bonding is performed while suppressing the amount of heat applied from the sheet can be expected to suppress warpage. Furthermore, low temperature bonding can suppress the amount of heat of the corrugator, so that energy consumption can be suppressed, and effects such as fuel cost reduction and carbon dioxide emission reduction can be expected. In response to such a background, interest in low temperature bonding has been greatly increased.
一方、大手段ボールメーカーでは、近年の不況の影響から、これまで複数の工場で行ってきた段ボールの製造を集約し、一工場で大量に段ボール生産を行うケースが増えている。このような工場では、大型でかつ高速運転が可能なコルゲーターが導入され、高い生産性を実現するため、これまで以上の高速貼合が求められている。しかし、このような大型コルゲーターで高速貼合を行うと、ライナー原紙とコルゲーターの熱板との接触時間が非常に短くなり、コルゲーターから受けることのできる熱量は抑制されてしまうため、接着剤中の澱粉の糊化が十分に行われず、必要な接着強度が得られない場合が生じている。 On the other hand, the major means of cardboard manufacturers are increasing the number of corrugated cardboard productions that have been carried out in several factories and mass production at one factory due to the recent recession. In such factories, corrugators that are large and capable of high-speed operation are introduced, and in order to achieve high productivity, higher-speed bonding is required than ever. However, when high-speed bonding is performed with such a large corrugator, the contact time between the liner base paper and the corrugator hot plate becomes very short, and the amount of heat that can be received from the corrugator is suppressed. There is a case where starch is not sufficiently gelatinized and a necessary adhesive strength cannot be obtained.
高速貼合や低温貼合など、省熱貼合の場合には、コルゲーターから受ける熱量は低く抑制されるため、接着剤中の澱粉は糊化が完了するのに必要な熱量を受けられなくなり、接着力発現が不十分となって、貼合不良を起こすケースが生じる。貼合不良を回避するには、コルゲーターの貼合速度を落とすことで、ライナーと熱板との接触時間を伸ばし、熱量を確保しなければならないため、生産性悪化の原因となる。このような生産性悪化を防ぐためには、コルゲーターから受ける熱量が抑制される場合においても、生産性を下げることなく、糊化が完了する澱粉を使用した接着剤が必要であり、その開発が望まれている。 In the case of heat-saving bonding, such as high-speed bonding and low-temperature bonding, the amount of heat received from the corrugator is suppressed low, so the starch in the adhesive will not receive the amount of heat necessary to complete gelatinization, In some cases, the adhesive force is insufficiently developed, resulting in poor bonding. In order to avoid poor bonding, the contact time between the liner and the hot plate must be increased by reducing the bonding speed of the corrugator, and the amount of heat must be ensured, resulting in deterioration of productivity. In order to prevent such deterioration in productivity, an adhesive using starch that completes gelatinization is required without lowering productivity even when the amount of heat received from the corrugator is suppressed. It is rare.
特許文献１には、少ない熱量においても、接着剤中の澱粉の糊化が完了する物性を付与するため、コーンスターチにエーテル化、エステル化などの加工を施す方法が記載されている。しかし、このような改質澱粉を用いる方法は、高い加工度が必要となり、加工を行うためのコストが高くなってしまうため、接着剤のコストを押し上げる要因となり、実際にはほとんど用いられていないのが現状である。また特許文献２には、もともとコーンスターチよりも急激な糊化を起こす物性を有している馬鈴薯澱粉と、安価なコーンスターチを混合使用し、安価で省熱貼合適性を有する接着剤を製造する方法が記載されている。この接着剤は、非常に安価ではあるが、コストを安く抑えるため、メイン澱粉のコーンスターチの混合割合を１〜７割としている。このような接着剤を省熱貼合に用いると、１〜７割を占めるコーンスターチは熱量不足のため糊化が十分にできず、製造される段ボールは必要な接着強度を得ることができない場合が生じるため、性能が不十分である。 Patent Document 1 describes a method of subjecting corn starch to processing such as etherification and esterification in order to impart physical properties to complete the gelatinization of starch in an adhesive even with a small amount of heat. However, the method using such modified starch requires a high degree of processing and increases the cost for processing, which increases the cost of the adhesive and is rarely used in practice. is the current situation. Further, Patent Document 2 discloses a method for producing an adhesive having a low cost and suitable for heat-saving pasting, by using a mixture of potato starch having a property that causes gelatinization more rapidly than corn starch and inexpensive corn starch. Is described. Although this adhesive is very inexpensive, the mixing ratio of the corn starch of the main starch is set to 1 to 70% in order to keep the cost low. When such an adhesive is used for heat-saving bonding, corn starch occupying 10 to 70% cannot be sufficiently gelatinized due to insufficient heat, and the manufactured cardboard may not be able to obtain the required adhesive strength. As a result, the performance is insufficient.
従って、価格面、性能面ともに満足する省熱貼合用の接着剤は、未だ開発されておらず、新しい接着剤の開発が望まれている。
本発明の課題は、低温貼合や高速貼合等、コルゲーターから十分な熱量を得ることができない省熱貼合においても、生産性を落とさずに段ボールの製造が可能な、安価で優れた接着剤、及びこの接着剤を用いて製造される段ボールを提供することである。 The object of the present invention is low-cost bonding, high-speed bonding, etc., in heat-saving bonding where a sufficient amount of heat cannot be obtained from a corrugator, making it possible to produce corrugated cardboard without reducing productivity, and excellent adhesion at low cost And a corrugated cardboard produced using the adhesive.
本発明者らは、アルカリ存在下で、安価な尿素を接着剤中に澱粉と共存させることにより、少ない熱量でも、接着剤中の未糊化澱粉の糊化が一気に完了する特性を澱粉に付与できることを見出し、これを段ボール貼合用接着剤に使用することで、前記課題を解決することに成功した。 In the presence of alkali, the present inventors coexist with starch in the adhesive to provide starch with the property that the gelatinization of the ungelatinized starch in the adhesive is completed at once even with a small amount of heat. It was found that it can be done, and succeeded in solving the said subject by using this for the adhesive agent for cardboard bonding.
即ち、本発明は以下の発明を包含する。
（１）澱粉及び尿素を含み、アルカリブラベンダーアミログラフによる測定方法において、粘度発現時間から５００ＢＵ（Brabender Unitの略）に達するまでの時間が３０分以下となる改質澱粉を用いることを特徴とする段ボール貼合用接着剤。
（２）全接着剤中の澱粉と尿素の比率が重量比で９９：１〜８０：２０である前記（１）に記載の段ボール貼合用接着剤。
（３）波形に成形された中芯と、澱粉系接着剤によって前記中芯の片面又は両面に貼合されたライナーとを有し、前記中芯及びライナーの貼合に、前記（１）又は（２）に記載の段ボール貼合用接着剤が用いられていることを特徴とする段ボール。
That is, the present invention includes the following inventions.
(1) In the measurement method using alkali Brabender amylograph, which contains starch and urea, a modified starch having a time from reaching viscosity of 500 BU (abbreviation of Brabender Unit) of 30 minutes or less is used. Corrugated cardboard adhesive.
(2) The adhesive for corrugated board bonding according to (1) above, wherein the ratio of starch to urea in the total adhesive is 99: 1 to 80:20 by weight.
(3) It has a core formed into a corrugated shape and a liner bonded to one or both sides of the core with a starch-based adhesive, and (1) or A corrugated cardboard, wherein the adhesive for corrugated cardboard bonding described in (2) is used.
本発明により、接着剤中の澱粉は、一気に糊化が完了する特性が付与され、このような接着剤を段ボール貼合用接着剤として使用することで、省熱貼合適性に優れた接着剤が得られ、省熱貼合の状況においても、十分な接着強度を有する段ボールが製造できる。 According to the present invention, the starch in the adhesive is given the property that gelatinization is completed at once, and by using such an adhesive as an adhesive for corrugated cardboard, an adhesive excellent in heat-saving bonding suitability Can be obtained, and a corrugated cardboard having sufficient adhesive strength can be produced even in a heat-saving bonding situation.
以下、本発明を詳細に説明する。
本発明の段ボール貼合用接着剤は、澱粉を主体とする接着剤であって、接着剤を加熱することで澱粉の持つ吸水・膨潤・糊化の各物性を利用して接着機能を発現させ、接着剤として機能するものであり、波形に成形された中芯原紙とライナー原紙を貼り合わせるために用いられるものである。
Hereinafter, the present invention will be described in detail.
The adhesive for corrugated board bonding of the present invention is an adhesive mainly composed of starch, and by heating the adhesive, the adhesive function is developed by utilizing the water absorption, swelling and gelatinization properties of starch. It functions as an adhesive and is used to bond a core base paper and a liner base paper formed into a corrugated shape.
本発明の段ボール貼合用接着剤は、澱粉及び尿素を含み、かつ、アルカリブラベンダーアミログラフによる測定方法において、粘度発現時間から５００ＢＵに達するまでの時間が３０分以下となる改質澱粉を用いることを特徴とする。 The adhesive for corrugated board bonding of the present invention uses modified starch that contains starch and urea, and in which the time from reaching the viscosity to 500 BU is 30 minutes or less in the measurement method using an alkali Brabender amylograph. It is characterized by that.
尿素を使用した段ボール貼合用接着剤は、特公昭５８−４６２３４号公報、特公昭５８−３５６３２号公報等に記載されている。しかしこれらは、尿素とホルムアルデヒドとの縮合反応で生成される尿素−ホルムアルデヒド樹脂を接着剤の耐水性付与を目的として用いるものであり、本発明のように、接着剤中の未糊化澱粉の糊化特性を尿素の作用によって改質する発明はこれまでに見当たらない。また、本発明における尿素の代わりに、尿素−ホルムアルデヒド樹脂を用いても、アルカリブラベンダーアミログラフによる測定方法において、粘度発現時間から５００ＢＵに達するまでの時間が３０分以下となる改質澱粉は得られない。 The adhesive for corrugated cardboard bonding using urea is described in JP-B-58-46234, JP-B-58-35632, and the like. However, these use urea-formaldehyde resin produced by the condensation reaction of urea and formaldehyde for the purpose of imparting water resistance to the adhesive, and as in the present invention, the paste of ungelatinized starch in the adhesive is used. No invention has been found so far to improve the chemical properties by the action of urea. Further, even when urea-formaldehyde resin is used instead of urea in the present invention, a modified starch having a time from viscosity onset to 500 BU of 30 minutes or less is obtained in the measurement method using an alkali Brabender amylograph. I can't.
尿素が澱粉の糊化特性を改質する作用については、詳細は不明であるが、尿素はアルカリの存在により分解され、アンモニアを生成することが知られており、通常ｐＨ１２付近で使用されている段ボール貼合用接着剤中においては、尿素から生成されたアンモニアは、接着剤中に溶解され、アンモニウムイオンと水酸化物イオンに分解されていると考えられる。水酸化物イオンは、未糊化澱粉の水素結合を緩やかに弛緩する作用を有すため、澱粉が糊化しやすい状態となり、一気に糊化が完了する物性が付与されるものと考えられる。澱粉は糊化を開始してから終了するまでの間も、エネルギーを必要とし、外部から与えられた熱エネルギーを吸収し続けるが、このような物性が付与された澱粉は、糊化の開始から終了までの時間が非常に短く、一気に糊化が完了するため、この間に必要とされる熱量を少なく抑えることができるようになるものと考えられる。本発明者らは、尿素の持つこの作用を、段ボール貼合用接着剤の未糊化澱粉に及ぼすことによって、少ない熱量においても糊化の完了が可能な、省熱貼合適性に優れた接着剤を得ることに成功し、この接着剤を用いて段ボールを製造すると、生産性を落とすことなく、良好な接着強度を有する段ボールが得られることを見出した。 The details of the action of urea on the gelatinization properties of starch are unknown, but it is known that urea is decomposed by the presence of alkali to produce ammonia, and is usually used near pH 12. In the adhesive for corrugated cardboard bonding, ammonia generated from urea is considered to be dissolved in the adhesive and decomposed into ammonium ions and hydroxide ions. Since hydroxide ions have an action of gently relaxing the hydrogen bond of ungelatinized starch, it is considered that starch is easily gelatinized, and physical properties that complete gelatinization at a stretch are imparted. Starch requires energy from the start to the end of gelatinization and continues to absorb externally applied thermal energy, but starch with such physical properties is from the start of gelatinization. Since the time until completion is very short and gelatinization is completed at once, it is considered that the amount of heat required during this period can be suppressed to a small amount. The present inventors exerted this action of urea on the non-gelatinized starch of the adhesive for corrugated board bonding, so that the gelatinization can be completed even with a small amount of heat, and the adhesive has excellent heat-saving bonding suitability. The present inventors have succeeded in obtaining an agent, and found that when corrugated board is produced using this adhesive, corrugated board having good adhesive strength can be obtained without reducing productivity.
本発明に用いる尿素は、特に限定されず、粉状、顆粒状、水溶液等が使用できる。尿素を作用させる方法については、粉状や顆粒状の尿素を澱粉と混ぜ合わせる方法、尿素水溶液や澱粉分散液に澱粉や尿素を溶解させる方法、尿素水溶液を澱粉に噴霧する方法、接着剤の調製中あるいは調製後に尿素を接着剤中に溶解する方法等、どのような方法を用いてもよい。尿素を澱粉に作用させる時期については、接着剤の調製中、調製後、あるいは調製前が挙げられるが、いずれの場合でもよく、調製前の場合、改質後に澱粉の水素結合の弛緩促進を目的に加熱あるいは冷却を実施してもよい。 The urea used in the present invention is not particularly limited, and powders, granules, aqueous solutions and the like can be used. As for the method of making urea act, the method of mixing powdery or granular urea with starch, the method of dissolving starch or urea in urea aqueous solution or starch dispersion, the method of spraying urea aqueous solution onto starch, the preparation of adhesive Any method such as a method of dissolving urea in an adhesive during or after preparation may be used. The timing of the action of urea on starch may be during, after, or before the preparation of the adhesive, but in any case, the purpose is to promote relaxation of starch hydrogen bonds after modification. Heating or cooling may be performed.
省熱貼合適性の向上効果及び接着剤が粘度安定性の点で、全接着剤中の澱粉と尿素の比率は、重量比で９９：１〜８０：２０であることが好ましく、９９：１〜９０：１０であることが更に好ましい。尿素の重量比が澱粉に対し１重量％未満であると、得られる澱粉の糊化特性は、未処理の澱粉と大差がなく、省熱貼合適性の向上が図れない。 It is preferable that the ratio of starch and urea in the total adhesive is 99: 1 to 80:20 in terms of weight ratio in terms of improving heat-saving bonding suitability and viscosity stability of the adhesive, and 99: 1. More preferably, it is -90: 10. When the weight ratio of urea is less than 1% by weight with respect to starch, the gelatinization property of the obtained starch is not significantly different from that of untreated starch, and the heat-saving bonding suitability cannot be improved.
一方、原料用澱粉は、段ボール貼合用接着剤に通常用いられているいずれの澱粉でもよく、特に限定されるものはないが、例えばコーンスターチ、ハイアミロースコーンスターチ、ワキシーコーンスターチ、タピオカ澱粉、甘藷澱粉、馬鈴薯澱粉、小麦澱粉、米澱粉、サゴ澱粉などの天然澱粉、それらをエーテル化、エステル化、カチオン化、酸化もしくは酸処理した加工澱粉、又はこれらの澱粉の混合物を用いることができる。 On the other hand, the starch for raw materials may be any starch that is usually used for adhesives for corrugated cardboard bonding, and is not particularly limited, for example, corn starch, high amylose corn starch, waxy corn starch, tapioca starch, sweet potato starch, Natural starch such as potato starch, wheat starch, rice starch, sago starch, processed starch obtained by etherification, esterification, cationization, oxidation or acid treatment thereof, or a mixture of these starches can be used.
糊化特性を改質した澱粉の改質度合いは、アルカリブラベンダーアミログラフによる測定方法（以下「アルカリブラベンダー法」という。）で測定でき、その測定値は、粘度発現時間と粘度が５００ＢＵに達するまでの時間の差（以下「ΔＴ」という。）が、３０分以下であることが必要であり、好ましくは４〜３０分、更に好ましくは５〜２５分である。この値が３０分を超えると、澱粉の糊化特性の改質度合いは不十分であり、省熱貼合適性の向上が図れない。ここで、アルカリブラベンダー法は、アルカリ水溶液に分散させた澱粉の糊化特性を測定する方法で、次のように測定を行う。 The degree of modification of starch with modified gelatinization characteristics can be measured by a measurement method using an alkali Brabender amylograph (hereinafter referred to as “alkaline Brabender method”). The difference in time to reach (hereinafter referred to as “ΔT”) needs to be 30 minutes or less, preferably 4 to 30 minutes, more preferably 5 to 25 minutes. When this value exceeds 30 minutes, the degree of modification of the gelatinization property of starch is insufficient, and the heat-saving bonding suitability cannot be improved. Here, the alkali Brabender method is a method for measuring the gelatinization characteristics of starch dispersed in an alkaline aqueous solution, and is measured as follows.
まず、澱粉１２５ｇに全量で３００ｇとなるまで純水を加え、澱粉を分散させる。これに２５重量％の水酸化ナトリウム水溶液１０ｍｌと純水１８０ｍｌを混合した溶液をゆっくり加え、澱粉分散液を得る。得られた澱粉分散液をブラベンダーアミログラフの容器に移した後、全量が５００ｇとなるよう純水を加えて調整し、ブラベンダーアミログラフを始動させる。ブラベンダーアミログラフは、液温が４４℃になるまで毎分１．５℃の速度で昇温し、４４℃に達したら４４℃で保持するようプログラムし、４４℃に達してから、分散液が粘度を発現させた時間と、粘度が５００ＢＵに達するまでの時間を測定し、その時間の差ΔＴを算出する。またこのアルカリブラベンダー法においては、カートリッジ７００ｃｍ−ｇを使用し、回転数１００ｒｐｍで行う。 First, pure water is added to 125 g of starch until the total amount becomes 300 g, and the starch is dispersed. A solution obtained by mixing 10 ml of a 25 wt% aqueous sodium hydroxide solution and 180 ml of pure water is slowly added to obtain a starch dispersion. After the obtained starch dispersion is transferred to a Brabender amylograph container, pure water is added to adjust the total amount to 500 g, and the Brabender amylograph is started. The Brabender amylograph is programmed to heat up at a rate of 1.5 ° C. per minute until the liquid temperature reaches 44 ° C., and is programmed to hold at 44 ° C. when the temperature reaches 44 ° C. Measure the time until the viscosity is developed and the time until the viscosity reaches 500 BU, and calculate the difference ΔT between the times. In this alkaline Brabender method, a cartridge of 700 cm-g is used and the rotation is performed at 100 rpm.
本発明の段ボール貼合用接着剤においては、澱粉、尿素のほかに、水、アルカリ化合物が使用され、必要に応じ硼素化合物、タンニン、カルボキシメチルセルロース、アルギン酸ナトリウム、各種増粘剤等も使用できる。使用される水については、澱粉重量に対し、１．８〜４．０倍重量加えることが望ましい。アルカリ化合物としては、例えば、水酸化ナトリウム、水酸化カリウム等のアルカリ金属水酸化物；水酸化カルシウム、水酸化マグネシウム等のアルカリ土類金属水酸化物等、従来段ボール貼合用接着剤に使用されているものを使用でき、硼素化合物としては、例えば硼砂、硼酸、メタ硼酸ナトリウム等が使用できる。また本発明の段ボール貼合用接着剤の調製方法については、通常行われているツータンクもしくはワンタンクステインホール法、プレミックス法、ノーキャリア法などを用いることができる。 In the corrugated board bonding adhesive of the present invention, water and alkali compounds are used in addition to starch and urea, and boron compounds, tannins, carboxymethylcellulose, sodium alginate, various thickeners, and the like can be used as necessary. About the water used, it is desirable to add 1.8 to 4.0 times weight with respect to starch weight. Examples of the alkali compound include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide; alkaline earth metal hydroxides such as calcium hydroxide and magnesium hydroxide. As the boron compound, for example, borax, boric acid, sodium metaborate and the like can be used. Moreover, about the preparation method of the adhesive for corrugated cardboard bonding of this invention, the usual two tank or one tank stain hole method, the premix method, the no carrier method, etc. can be used.
本発明の段ボールは、本発明の段ボール貼合用接着剤を用いて製造されたものであり、波形に成形された中芯と、段ボール貼合用接着剤によって前記中芯の片面又は両面に貼合されたライナーとを有し、前記中芯及びライナーの貼合に、前述した本発明の段ボール貼合用接着剤が用いられていることを特徴とする。 The corrugated cardboard of the present invention is manufactured using the corrugated cardboard bonding adhesive of the present invention, and is bonded to one or both sides of the core by the corrugated core and the corrugated carding adhesive. The corrugated cardboard bonding adhesive of the present invention described above is used for bonding the core and the liner.
本発明の段ボールは、段ボールの製造で通常使用されるコルゲーターを用いて製造することができる。即ち、本発明の段ボールは、糊ロール及び糊ロールに段ボール貼合用接着剤を付着させる手段を少なくとも有するコルゲーターを用い、波形に成形された中芯の頂縁と糊ロールとを当接させて頂縁に段ボール貼合用接着剤を塗布する工程と、中芯の、段ボール貼合用接着剤が塗布された面側にライナーを貼り合わせる工程とを含む段ボールの製造方法において、前述した本発明の段ボール貼合用接着剤を用いることにより製造することができる。 The corrugated cardboard of the present invention can be manufactured using a corrugator usually used in the manufacture of corrugated cardboard. That is, the corrugated cardboard of the present invention uses a corrugator having at least a glue roll and a means for adhering the corrugated cardboard bonding adhesive to the glue roll, and the top edge of the core formed into a corrugated shape is brought into contact with the glue roll. In the method for producing corrugated cardboard, including the step of applying an adhesive for corrugated cardboard bonding to the top edge, and the step of bonding the liner to the surface of the core coated with the adhesive for corrugated cardboard bonding, the present invention described above. It can manufacture by using the adhesive agent for corrugated cardboard bonding.
本発明の段ボールは、中芯及びライナーの貼合に本発明の段ボール貼合用接着剤を用いるものであれば特に制限はなく、片面段ボール、両面段ボール、複両面段ボール、複複両面段ボールのいずれをも包含する。 The corrugated cardboard of the present invention is not particularly limited as long as the corrugated cardboard bonding adhesive of the present invention is used for laminating the core and the liner, and any of single-sided cardboard, double-sided cardboard, double-sided cardboard, and double-sided and double-sided cardboard Is also included.
以下、実施例及び比較例を挙げて本発明を更に具体的に説明するが、本発明はこれらの実施例に限定されるものではない。また以下の実施例及び比較例において、(a)フォードカップ粘度（以下「ＦＣＶ」という。）、(b)Ｂ型粘度、(c)糊化温度及び(d)接着強度の測定は以下の方法で行った。
(a)ＦＣＶ：東洋テスター工業（株）製のフォードカップ（水１０秒）により測定した。
(b)Ｂ型粘度：東京計器（株）製の回転粘度計（型式：ＢＭ型）を用いて、６０ｒｐｍで測定した。
(c)糊化温度：ブラベンダーアミログラフを用いて測定した。試料５００ｇをブラベンダーカップにとり、カートリッジ７５０ｃｍ−ｇ、回転数１００ｒｐｍ、昇温速度１．５℃／分の条件で測定し、測定中の最低粘度から、５００ＢＵ上昇したときの温度を糊化温度とした。
（ｄ）接着強度：製造した段ボールのシートを横５ｃｍ、縦８．５ｃｍの大きさに切り、温度２３℃、相対湿度５０％の恒温恒湿室中で２４時間放置する。その後、リングクラッシュテスター（日本ＴＭＣ（株）製）にて、その接着強度を測定した。
EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated further more concretely, this invention is not limited to these Examples. In the following examples and comparative examples, (a) Ford cup viscosity (hereinafter referred to as “FCV”), (b) B-type viscosity, (c) gelatinization temperature and (d) adhesive strength are measured by the following method. I went there.
(a) FCV: Measured with a Ford cup (water 10 seconds) manufactured by Toyo Tester Kogyo Co., Ltd.
(b) B-type viscosity: Measured at 60 rpm using a rotational viscometer (model: BM type) manufactured by Tokyo Keiki Co., Ltd.
(c) Gelatinization temperature: measured using a Brabender amylograph. A sample of 500 g is taken in a Brabender cup, measured under conditions of cartridge 750 cm-g, rotation speed 100 rpm, temperature rising rate 1.5 ° C./min. The temperature when 500 BU rises from the lowest viscosity during measurement is the gelatinization temperature. did.
(D) Adhesive strength: The produced corrugated cardboard sheet is cut into a size of 5 cm wide and 8.5 cm long and left in a constant temperature and humidity chamber at a temperature of 23 ° C. and a relative humidity of 50% for 24 hours. Thereafter, the adhesive strength was measured with a ring crush tester (manufactured by Nippon TMC Co., Ltd.).
（比較例１）
柿田工業（株）製段ボール貼合用接着剤調製用タンクに、３５℃に加温した水８６０ｋｇを入れ、撹拌しながら、予めアルカリブラベンダー法にてΔＴを測定したコーンスターチ（王子コーンスターチ（株）製）６８ｋｇを分散させた。これに２５重量％濃度の水酸化ナトリウム水溶液５８ｋｇを加え、１０分間撹拌して、キャリア用糊を得た。次にこのキャリア用糊に、３５℃の水８００ｋｇ、前記コーンスターチ５００ｋｇ、硼砂１１．４ｋｇを連続して加えた後、１５分間撹拌して、接着剤１を調製した。調製した接着剤のＦＣＶ、Ｂ型粘度、糊化温度を測定後、接着剤１を使用して、最高速度２５０ｍ／ｍｉｎ、最大紙幅１８００ｍｍの三菱重工（株）製コルゲーターにて、Ｋライナー（２２０ｇ）と中芯（１６０ｇ）の貼合を行い、段ボールを製造した後、得られた段ボールの接着強度を測定した。なお、貼合の条件は、コルゲーターの熱板に通す蒸気の蒸気圧１．１ＭＰａ（熱板温度１８５℃）、貼合速度２００ｍ／ｍｉｎとした。その結果を表１に示す。
(Comparative Example 1)
Corn starch (Oji Corn Starch Co., Ltd.) in which 860 kg of water heated to 35 ° C. was put into an adhesive preparation tank for cardboard bonding manufactured by Iwata Kogyo Co., Ltd. and ΔT was measured in advance by the alkali Brabender method while stirring. 68 kg) was dispersed. To this was added 58 kg of 25% strength by weight aqueous sodium hydroxide solution and stirred for 10 minutes to obtain a paste for carrier. Next, 800 kg of water at 35 ° C., 500 kg of the corn starch and 11.4 kg of borax were continuously added to the carrier paste, and then stirred for 15 minutes to prepare an adhesive 1. After measuring the FCV, B-type viscosity, and gelatinization temperature of the prepared adhesive, K liner (220 g) was used with an adhesive 1 using a corrugator manufactured by Mitsubishi Heavy Industries, Ltd. with a maximum speed of 250 m / min and a maximum paper width of 1800 mm. ) And a core (160 g) were bonded together to produce a corrugated cardboard, and then the adhesive strength of the corrugated cardboard obtained was measured. The bonding conditions were a vapor pressure of 1.1 MPa (hot plate temperature 185 ° C.) and a bonding speed of 200 m / min. The results are shown in Table 1.
（比較例２）
貼合条件をコルゲーターの熱板に通す蒸気の蒸気圧を０．８ＭＰａ（熱板温度１７０℃）とする以外は、比較例１と同様の方法で、接着剤の調製及び段ボールの製造を行い、得られた段ボールの接着強度を測定した。その結果を表１に示す。
(Comparative Example 2)
Except that the vapor pressure of the vapor passing through the hot plate of the corrugator is 0.8 MPa (hot plate temperature 170 ° C.), the adhesive is prepared and the corrugated board is manufactured in the same manner as in Comparative Example 1, The adhesive strength of the obtained cardboard was measured. The results are shown in Table 1.
（実施例１）
コーンスターチ９５０ｋｇと尿素（日産化学（株）製；以下同様）５０ｋｇを混合後、よく撹拌して、尿素添加澱粉１を得、アルカリブラベンダー法にてΔＴを測定した。比較例１のコーンスターチを尿素添加澱粉１に変え、貼合条件のコルゲーターの熱板に通す蒸気の蒸気圧を０．８ＭＰａ（熱板温度１７０℃）とする以外は、比較例１と同様の方法で、接着剤の調製及び段ボールの製造を行い、得られた段ボールの接着強度を測定した。その結果を表１に示す。
Example 1
After mixing 950 kg of corn starch and 50 kg of urea (manufactured by Nissan Chemical Co., Ltd .; the same applies hereinafter), the mixture was stirred well to obtain urea-added starch 1, and ΔT was measured by the alkali Brabender method. The same method as in Comparative Example 1 except that the corn starch of Comparative Example 1 is changed to urea-added starch 1 and the vapor pressure of the steam passing through the hot plate of the corrugator under the bonding conditions is 0.8 MPa (hot plate temperature 170 ° C.). Then, the adhesive was prepared and the corrugated board was manufactured, and the adhesive strength of the obtained corrugated board was measured. The results are shown in Table 1.
（実施例２）
コーンスターチ９３０ｋｇと尿素７０ｋｇを混合後、よく撹拌して、尿素添加澱粉２を得、アルカリブラベンダー法にてΔＴを測定した。比較例１のコーンスターチを尿素添加澱粉２に変え、貼合条件のコルゲーターの熱板に通す蒸気の蒸気圧を０．８ＭＰａ（熱板温度１７０℃）とする以外は、比較例１と同様の方法で、接着剤の調製及び段ボールの製造を行い、得られた段ボールの接着強度を測定した。その結果を表１に示す。
(Example 2)
After mixing 930 kg of corn starch and 70 kg of urea, the mixture was well stirred to obtain urea-added starch 2 and ΔT was measured by the alkali Brabender method. The same method as in Comparative Example 1 except that the corn starch of Comparative Example 1 is changed to urea-added starch 2 and the vapor pressure of the steam passing through the hot plate of the corrugator under the bonding conditions is 0.8 MPa (hot plate temperature 170 ° C.). Then, the adhesive was prepared and the corrugated board was manufactured, and the adhesive strength of the obtained corrugated board was measured. The results are shown in Table 1.
（実施例３）
コーンスターチ８５０ｋｇと尿素１５０ｋｇを混合後、よく撹拌して、尿素添加澱粉３を得、アルカリブラベンダー法にてΔＴを測定した。比較例１のコーンスターチを尿素添加澱粉３に変え、貼合条件のコルゲーターの熱板に通す蒸気の蒸気圧を０．８ＭＰａ（熱板温度１７０℃）とする以外は、比較例１と同様の方法で、接着剤の調製及び段ボールの製造を行い、得られた段ボールの接着強度を測定した。その結果を表１に示す。
(Example 3)
After mixing 850 kg of corn starch and 150 kg of urea, the mixture was thoroughly stirred to obtain urea-added starch 3 and ΔT was measured by the alkali Brabender method. The same method as in Comparative Example 1 except that the corn starch of Comparative Example 1 is changed to urea-added starch 3 and the vapor pressure of the steam passing through the hot plate of the corrugator under the bonding conditions is 0.8 MPa (hot plate temperature 170 ° C.). Then, the adhesive was prepared and the corrugated board was manufactured, and the adhesive strength of the obtained corrugated board was measured. The results are shown in Table 1.
（実施例４）
水分３４〜３５重量％を含むコーンスターチ１５００ｋｇと尿素３０ｋｇを混練機で、５分間混合撹拌した後、乾燥機で水分が１２〜１３重量％となるまで乾燥し、尿素添加澱粉５を得、アルカリブラベンダー法にてΔＴを測定した。比較例１のコーンスターチを尿素添加澱粉５に変え、貼合条件のコルゲーターの熱板に通す蒸気の蒸気圧を０．８ＭＰａ（熱板温度１７０℃）とする以外は、比較例１と同様の方法で、接着剤の調製及び段ボールの製造を行い、得られた段ボールの接着強度を測定した。その結果を表１に示す。
Example 4
After mixing and stirring 1500 kg of corn starch containing 34 to 35% by weight of water and 30 kg of urea for 5 minutes with a kneader, the mixture is dried with a dryer until the water content becomes 12 to 13% by weight to obtain urea-added starch 5; ΔT was measured by the lavender method. The same method as in Comparative Example 1 except that the corn starch of Comparative Example 1 is changed to urea-added starch 5 and the vapor pressure of the steam passing through the hot plate of the corrugator under the bonding conditions is 0.8 MPa (hot plate temperature 170 ° C.). Then, the adhesive was prepared and the corrugated board was manufactured, and the adhesive strength of the obtained corrugated board was measured. The results are shown in Table 1.
（実施例５）
２０重量％濃度の尿素水溶液３０００ｋｇ中にコーンスターチ１０００ｋｇを分散させ、１５分撹拌混合した。この分散液を、ろ過機を用いてろ過した後、沈殿物を乾燥機で乾燥し、実測値で、尿素の含有率が５．３％となった、尿素添加澱粉６を得、アルカリブラベンダー法にてΔＴを測定した。比較例１のコーンスターチを尿素添加澱粉６に変え、貼合条件のコルゲーターの熱板に通す蒸気の蒸気圧を０．８ＭＰａ（熱板温度１７０℃）とする以外は、比較例１と同様の方法で、接着剤の調製及び段ボールの製造を行い、得られた段ボールの接着強度を測定した。その結果を表１に示す。
(Example 5)
1000 kg of corn starch was dispersed in 3000 kg of a 20 wt% aqueous urea solution and stirred and mixed for 15 minutes. This dispersion was filtered using a filter, and then the precipitate was dried using a dryer. As a result, urea-added starch 6 having a urea content of 5.3% was obtained. ΔT was measured by the method. The same method as in Comparative Example 1 except that the corn starch of Comparative Example 1 is changed to urea-added starch 6 and the vapor pressure of the steam passing through the hot plate of the corrugator under the bonding conditions is 0.8 MPa (hot plate temperature 170 ° C.). Then, the adhesive was prepared and the corrugated board was manufactured, and the adhesive strength of the obtained corrugated board was measured. The results are shown in Table 1.
（実施例６）
コーンスターチ１０００ｋｇを混練機に入れ、よく撹拌しながら、４０重量％濃度の尿素水溶液５０ｋｇ（尿素分として２０ｋｇ）を噴霧した。噴霧後、乾燥機で水分が１２重量％程度となるまで乾燥し、尿素添加澱粉７を得、アルカリブラベンダー法にてΔＴを測定した。比較例１のコーンスターチを尿素添加澱粉７に変え、貼合条件のコルゲーターの熱板に通す蒸気の蒸気圧を０．８ＭＰａ（熱板温度１７０℃）とする以外は、比較例１と同様の方法で、接着剤の調製及び段ボールの製造を行い、得られた段ボールの接着強度を測定した。その結果を表１に示す。
(Example 6)
1000 kg of corn starch was placed in a kneader and sprayed with 50 kg of urea aqueous solution having a concentration of 40 wt% (20 kg as urea content) while stirring well. After spraying, it was dried with a dryer until the water content was about 12% by weight to obtain urea-added starch 7, and ΔT was measured by the alkali Brabender method. The same method as in Comparative Example 1 except that the corn starch of Comparative Example 1 is changed to urea-added starch 7 and the vapor pressure of the steam passing through the hot plate of the corrugator under the bonding conditions is 0.8 MPa (hot plate temperature 170 ° C.). Then, the adhesive was prepared and the corrugated board was manufactured, and the adhesive strength of the obtained corrugated board was measured. The results are shown in Table 1.
（実施例７）
比較例１で調製した接着剤１に尿素２８．４ｋｇを溶解させた後、よく撹拌し、段ボール貼合用接着剤を得た。この接着剤を使用して、比較例２と同様の条件で段ボールの製造を行い、得られた段ボールの接着強度を測定した。その結果を表１に示す。
(Example 7)
After 28.4 kg of urea was dissolved in the adhesive 1 prepared in Comparative Example 1, the mixture was well stirred to obtain an adhesive for corrugated cardboard bonding. Using this adhesive, corrugated board was produced under the same conditions as in Comparative Example 2, and the adhesive strength of the obtained corrugated board was measured. The results are shown in Table 1.
（比較例３）
比較例１で調製した接着剤１に尿素−ホルムアルデヒド樹脂であるスーパーライム＃２２０（東立化成（株）製）４０ｋｇを加えた後、よく撹拌し、段ボール貼合用接着剤を得た。この接着剤を使用して、比較例２と同様の条件で段ボールの製造を行い、得られた段ボールの接着強度を測定した。その結果を表１に示す。
(Comparative Example 3)
After adding 40 kg of super lime # 220 (made by Todate Kasei Co., Ltd.), which is a urea-formaldehyde resin, to the adhesive 1 prepared in Comparative Example 1, the mixture was stirred well to obtain an adhesive for corrugated cardboard bonding. Using this adhesive, corrugated board was produced under the same conditions as in Comparative Example 2, and the adhesive strength of the obtained corrugated board was measured. The results are shown in Table 1.
表１より、本発明の段ボール貼合用接着剤は、コルゲーターから受ける熱量を低く抑えた低温貼合の状況においても、生産性を落とすことなく、良好な接着強度を有する段ボールの生産が可能であることがわかる。 From Table 1, the adhesive for corrugated board bonding of the present invention can produce corrugated board having good adhesive strength without reducing productivity even in the low temperature bonding situation where the amount of heat received from the corrugator is kept low. I know that there is.
（比較例４）
貼合を行うときの貼合速度を２３０ｍ/minとする以外は、比較例１と同様の方法で、接着剤の調製及び段ボールの製造を行い、得られた段ボールの接着強度を測定した。その結果を表２に示す。
(Comparative Example 4)
The adhesive was prepared and the corrugated board was manufactured in the same manner as in Comparative Example 1 except that the laminating speed at the pasting was 230 m / min, and the adhesive strength of the obtained corrugated board was measured. The results are shown in Table 2.
（実施例８）
接着剤の調製に使用する澱粉を、比較例１のコーンスターチから尿素添加澱粉１に変え、貼合を行うときの貼合速度を２３０m/minとする以外は、比較例１と同様の方法で、接着剤の調製及び段ボールの製造を行い、得られた段ボールの接着強度を測定した。その結果を表２に示す。
(Example 8)
The starch used for the preparation of the adhesive is changed from the corn starch of Comparative Example 1 to the urea-added starch 1, and is the same method as Comparative Example 1 except that the bonding speed when performing the bonding is 230 m / min. The adhesive was prepared and the corrugated board was manufactured, and the adhesive strength of the obtained corrugated board was measured. The results are shown in Table 2.
（実施例９）
接着剤の調製に使用する澱粉を、比較例１のコーンスターチから尿素添加澱粉２に変え、貼合を行うときの貼合速度を２５０m/minとする以外は、比較例１と同様の方法で、接着剤の調製及び段ボールの製造を行い、得られた段ボールの接着強度を測定した。その結果を表２に示す。
Example 9
The starch used for the preparation of the adhesive was changed from the corn starch of Comparative Example 1 to the urea-added starch 2, and the method was the same as that of Comparative Example 1 except that the bonding speed when performing the bonding was 250 m / min. The adhesive was prepared and the corrugated board was manufactured, and the adhesive strength of the obtained corrugated board was measured. The results are shown in Table 2.
表２より、本発明の段ボール貼合用接着剤は、貼合速度を速めた高速貼合の状況においても、十分な強度を有する段ボールを製造できることがわかる。 From Table 2, it can be seen that the corrugated board bonding adhesive of the present invention can produce corrugated board having sufficient strength even in the situation of high-speed bonding in which the bonding speed is increased.
Claims (6)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007224099A (en) * | 2006-02-22 | 2007-09-06 | Shikishima Starch Kk | Adhesive for corrugated cardboard, not containing boron compound |
| JP2019178289A (en) * | 2018-03-30 | 2019-10-17 | 大日本印刷株式会社 | Starch paste |
| AU2020287947B2 (en) * | 2019-06-05 | 2022-12-08 | Oji Holdings Corporation | Corrugated cardboard material and corrugated cardboard box using same |
| JP6697616B1 (en) * | 2019-06-05 | 2020-05-20 | 王子ホールディングス株式会社 | Cardboard material and cardboard box using the same |
| JP6697613B1 (en) * | 2019-06-05 | 2020-05-20 | 王子ホールディングス株式会社 | Cardboard material and cardboard box using the same |
| JP6697614B1 (en) * | 2019-06-05 | 2020-05-20 | 王子ホールディングス株式会社 | Cardboard material and cardboard box using the same |
| JP6697615B1 (en) * | 2019-06-05 | 2020-05-20 | 王子ホールディングス株式会社 | Cardboard material and cardboard box using the same |
| JP6697617B1 (en) * | 2019-06-05 | 2020-05-20 | 王子ホールディングス株式会社 | Cardboard material and cardboard box using the same |
| JP6813114B2 (en) * | 2020-04-23 | 2021-01-13 | 王子ホールディングス株式会社 | Cardboard material and cardboard boxes using it |
| JP6813112B2 (en) * | 2020-04-23 | 2021-01-13 | 王子ホールディングス株式会社 | Cardboard material and cardboard boxes using it |
| JP6813113B2 (en) * | 2020-04-23 | 2021-01-13 | 王子ホールディングス株式会社 | Cardboard material and cardboard boxes using it |
| JP6813116B2 (en) * | 2020-04-23 | 2021-01-13 | 王子ホールディングス株式会社 | Cardboard material and cardboard boxes using it |
| JP6813115B2 (en) * | 2020-04-23 | 2021-01-13 | 王子ホールディングス株式会社 | Cardboard material and cardboard boxes using it |
| CN117925290B (en) * | 2024-03-21 | 2024-06-11 | 山东科迈生物制浆有限公司 | Method for preparing biomass fuel from pulping waste |
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