Since this technology was available, corrugated cartons can raise fish.

[Chinese Packaging Network News] The degree of splashing water is a measure of water repellency on the surface of corrugated boxes. According to the standard CNS 3687 carton waterproof rating is divided into R0 ~ R10 8 grades, of which the best waterproof performance of R10 grade, reached R10 grade packaging products (Suzhou) Co., Ltd. can fish culture, see Figure 1.

The water-repellent paperboard separates the water when it encounters rain or a small amount of water to prevent moisture intrusion and affect the strength of the carton. This technique was originally introduced from Japan and was written on the surface as "water repellent." This water-repellent coating was used on fabric fibers in the early stages and was later used for waterproofing cardboard. Water repellent is a wax emulsion with a solids content of 48% to 51%. Its greatest feature is that it can be diluted with water in use. According to different levels of water resistance, the dilution ratio can range from 10 times to 45 times, and then roll. It is applied to the surface of corrugated board and dried at a temperature of about 170°C. Water repellents are mainly used in moisture-proof cartons, which have less waterproof effect. In order to achieve a better waterproof effect, Suzhou has achieved a uniform, quantitative, and precise coating on the surface of the paper by using imported waterproof coatings and coating machines, and embedding the active ingredients in the coating into paper fibers under high temperature and high pressure. In the gap, a new layer of material is formed on the surface of the paper. When it encounters water, the water will not infiltrate the cardboard, forming a drop of water and falling down, so as to achieve a high level of requirements of the waterproof carton.

The main application areas of moisture-proof and waterproof cardboard boxes are high temperature and humidity packages in warehousing, transportation and transportation. For example: export products, the sea must pass through the Strait of Malacca. At this time, it is sailing on the equator, the temperature can reach 70°C, relative humidity > 90%, the carton will be damp and less than 60% of the normal pressure, when serious cases of collapse, product damage, customer complaints and so on. Second, the cold storage of frozen products (meat food, aquatic products, cold drinks, quick-frozen products, etc.), Jiangnan "Huang Meitian" period of special use boxes.

The advantages of moisture-proof and waterproof treatment:

1 Low cost. The moisture-proof carton is only 0.1 yuan to 0.15 yuan per square meter, and the waterproof cardboard box is only increased by about 0.6 yuan (depending on the requirements for batch and coating thickness).

2 The operation is simple and convenient. Can be synchronized in the automatic production line of corrugated board, cardboard before the compound in the water-spraying agent with the conveyor belt automatically coated on the cardboard surface, after the composite process immediately into the automatic hot plate area to dry, you can complete the moisture treatment. At the same time, the surface color of the coated corrugated board remains unchanged, and the strength increases.

3 moisture, waterproof effect, optimize and improve the physical properties of the carton.

4 When the waterproof case is within R5, there is no problem with the water-based factor after the water repellent is finished.

The detection method of moisture-proof waterproof carton is mainly the rapid test method of water repellency. This detection method was first introduced from Japan JIS Z1537 and later introduced by Taiwan, corresponding to the standard CNS 3687. In China's import and export inspection industry standard SN/T0715-1997 "Physical and chemical testing of export frozen food commodities transport packaging" in the physical and chemical testing there are moisture-proof treatment testing items, the minimum required to reach R6 level. Here's a detailed introduction to the specific testing method for the degree of splashing.

Testing equipment

Water penetration tester (see Figure 2). Instrument requirements: After the sample is placed at 45 ° tilt, tilt table length of 350mm, horizontal width of 200mm, the surface must be smooth and solid, above the slope device to install a sample holder, place the table under the burette, the tube inside Clean distilled water (20 ± 1) °C. Use a dropper adjusted to 0.1 ml per drop.

Detection step

1, pretreatment conditions and test environment:

According to the provisions of GB/T 4857.2, the sample shall be preconditioned for 24 hours at a temperature of (23 ± 2) °C, relative humidity of 50% ± 2%, or temperature (20 ± 2) °C, relative humidity of 65% ± 2%, and Test under this condition.

2, the sample taken:

Take a constant temperature and humidity treatment sample box, take 300mm × 200mm vertical and horizontal from the sample box cover mouth five, the sample should be smooth, does not contain watermarks, folds, wrinkles and scars.

3, sample steps:

Place the specimen on a 45° inclined surface and adjust the position of the pipette so that the distance between the nozzle and the specimen is 10 mm.

Open the burette to make the water drop drip. The flow length must be at least 250mm.

Observe the traces of water left on the sample, as shown in Figure 3 and Table 1 to determine the degree of splashing water.

At the time of the test, the vertical and horizontal direction samples shall be tested at least five times.

4, report:

The test results shall report the direction, number of tests, average value, maximum value, and minimum value of each sample.

Water splashing method can quickly determine the waterproof level of moisture-proof and waterproof cardboard compared to Ke Bofa. The main users of domestic water splashing degree measuring instrument are enterprises that produce moisture-proof and waterproof cardboard boxes, such as the enterprises that produce fruits and vegetables and frozen packaging cartons. For products requiring higher water resistance, according to the requirements of Class A in the standard GB/T 7350, a more rigorous testing method for the carton needs to be carried out—water immersion.