JPS5898239A - Manufacture of reinforced waterproof corrugated cardboard - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION In recent years, there has been a demand for reinforced water-strengthened corrugated cardboard with high water-resistance properties that allow corrugated poles to withstand transportation across the country. In addition, with the development of uses for cardboard, applications are also being made for containers that hold contents containing moisture or moisture, such as fruits and vegetables and fish.

The conventional theory of Jihwaling Suidan C-ru is that untreated cloth is mixed with liner or liner board, and corrugated core paper made from semi-chemical pulp or straw pulp is used as raw material. It had the disadvantage that it required a process of dipping or coating with synthetic resin or wax after laminating it with a starch A adhesive (corn starch) using a machine to form normal (untreated) corrugated board. . Furthermore, since the layer of synthetic #Ii fat and/or wax tends to be uneven, the number of KW filters needed to cover it is extremely large, which is uneconomical and also damages the outer reef of the corrugated board. In other words, even if you try to make cardboard by gluing reinforced urn paper (cover, core paper) that has been treated with synthetic resin or wax in advance, the m-layer property will be poor if the material is made of starch thread or #acid vinyl emulsion. , after being molded into corrugated cardboard in an untreated state, it must be treated with synthetic resin or wax, etc. The purpose of the present invention is to convert the cover and core paper into synthetic resin during the process of making corrugated cardboard using a corrugating machine. Another object of the present invention is to develop an adhesive that can be bonded even when using base paper that has been subjected to a water-repellent treatment for reinforcement with wax pads, and to provide a line method for reinforced water-strengthened corrugated cardboard that eliminates the above-mentioned drawbacks.

The present invention uses reinforced water-based paper treated with synthetic resin or wax, etc., using an adhesive containing vinyl acetate emulsion and acrylic tyrene copolymer latex as essential components.
This is a method for producing reinforced corrugated corrugated cardboard, which is characterized by pasting together to form corrugated poles using a corrugating machine.

Synthetic '#1' resins for reinforced water repellency treatment used in the present invention are those normally used by Corrugated Board Eikai, such as acrylic resin, styrene resin, urethane, and oil, and wax coppers include micro wax, There is paraffin wax #P. Reinforced microhydration method - [is the cover (liner,
liner board), the core paper of which has been reinforced with the above-mentioned synthetic resin or wax, etc., is used. Next, as the fD acid vinyl yarn emulsion that will be used as the adhesive, ordinary Popal is used as a body layer colloid, or hydroxyethyl cellulose (HIO) is used as a health colloid for the purpose of improving compatibility with the starch yarn adhesive. It is made by emulsion polymerization of vinyl acetate monomer, and has an ij & solid m content (40 to 70
%) is suitable. In addition, the acrylic styrene copolymer latex may be one that forms a hard coating film that is tough and has excellent blocking resistance as the crosslinking between particles progresses as moisture evaporates at room temperature. Acronal (Oilified Birdish KsKs) includes those that are externally plasticized with DBP#.

In the present invention, as a result of examining adhesives for bonding base paper treated with reinforced water repellency, it was found that acrylic styrene copolymer emulsions, especially those with self-crosslinking properties, are susceptible to attack. However, with this alone, the Fi minimum expansion temperature is over go℃, i4-, so the adhesive strength is insufficient when set at a low temperature, and if the corrugating machine does not apply enough heat, adhesive strength cannot be obtained, making it difficult to put it into practical use. At the same time, there was a problem in terms of cost, and at the same time, there was a problem in terms of cost, and this led to the present invention, which uses a vinyl acetate-based emulsion blend.

As for the blending ratio of the next VC vinegar elk vinyl emulsion and the acrylic styrene copolymer emulsion, in the solid state calculation, 20 to 4 (l) of the acrylic styrene copolymer emulsion is added to 100 parts of the vinyl acetate emulsion, resulting in low-temperature adhesion. It is easy to use and has good performance and price.

In other words, the acrylic resin ↓ added jiIt did not adhere to the forging water treated base paper with the 5 parts,
The 50-part part H has the same adhesive force with low m adhesion (when the temperature of the corrugating machine is low or the pressing time is short) and has the disadvantage of being expensive.

As mentioned above, adhesives made by blending vinyl acetate emulsion with acrylic styrene combined emulsion and, optionally, cornstarch's ready-to-starch adhesive, are manufactured using water-repellent water-repellent coatings (cover, This makes it possible to bond the corrugated paper (corrugated core paper), eliminates the need for water rupture treatment after converting untreated *a into corrugated cardboard, as in the past, and provides a hook product with a good appearance.

This will be explained using examples.

Practical example 1 Polyvinyl alcohol (polymerization &x'yoo, degree of saponification 8
Emulsion polymerization of vinyl #acid was carried out in a conventional manner using 8 mol %) as a colloid to obtain a polyvinyl acetate emulsion with a solid content of 50%. 100 parts by weight (hereinafter abbreviated as "parts") of this emulsion were mixed with a frame II type acrylic-styrene copolymer latex ("Acronal YX" manufactured by Yuka Bardishu).
-2715DJ) 301S was added, and 10 parts of cornstarch (Nippon Shokuhin Kako Seisan 600) was added to prepare an adhesive.

Next, a special liner made by Honshu Paper Co., Ltd., 1220 liner with 40 g/IK'' of paraffin wax coated on the flesh side, and Honshu Paper Co., Ltd. 190F-1g5 core rim with MDI.
(4,4-diphenylmethane diincyanate) solution
Using core paper impregnated with 0 g/lIl' and treated, one-sided corrugated board was manufactured using a 1600-inch width corrugating machine manufactured by Mitsubishi Langston Co., Ltd. with the above-mentioned stimulant. The operating conditions for the cogator are a single phaser step-forming roll with a humidity of 150°C and a humidity of 120"C. Line speed: OO!II/I!Iin. The adhesive was adjusted to 19 g/*''. The obtained corrugated paperboard sheet was cured for 3 days at a constant temperature of 25% and CS-related temperature of 65%, and then the following adhesive force test was conducted. The adhesive strength in Table 1 is the tensile breaking strength between the liner and the core of a test piece cut into 50 x 80- pieces, where **strength is
I had a lot of fun using the ring crush test machine. Note that the wl value in the table is the average J@ value of test piece 10451.

Table 1: Adhesive strength: Water resistance: Melting: The test piece is immersed in water at 20°C, and its strength is measured at regular intervals while still wet.

EXAMPLE Emulsion polymerization of vinyl acetate was carried out in a conventional manner using tetraxyethylcellulose (HIO) as an experimental colloid to obtain a polyacetic vinyl emulsion with a solid content of 60%. To this emulsion zoo@is, 15 parts of a 11-type acrylic-styrene compound latex (oiled perdish group "Acronal XY2?2i0D") was added to prepare an adhesive. The adhesive composition is miscible with general Stein-Hall starch glue, which is mainly composed of cornstarch, sodium hydroxide, and borax, and because they mix arbitrarily, it can be used continuously without washing. It has been found that this method is extremely advantageous in terms of the productivity of corrugating machines.

Using the same special liner and special core paper as in Example 1, a corrugated cardboard sheet was made in the same manner as in Example 1, and an adhesion test was conducted. Table 2 shows the supplied rice.

Table 2 Adhesive Strength Comparative Example 1 When the polyvinyl emulsions prepared in Examples 1 and 2 were used alone, no adhesive strength was obtained when the polyvinyl emulsions were used alone.

Patent applicant: Aikani Kuri Co., Ltd.

Claims (1)

[Claims] Reinforced water-containing base paper treated with synthetic #il oil or wax is corrugated using a collage agent containing vinyl acetate yarn emulsion and acrylic styrene co-arranged latex as essential components. A method of making corrugated cardboard that allows the use of a machine to bond it together to form corrugated cardboard. 2. The method for producing a water-carrying corrugated board according to claim 1, wherein the adhesive has a blending ratio of vinyl acetate yarn emulsion/self-curing am acrylic styrene co-arrangement latex of 100 parts to 15 to 50 parts. .