The use of disposable paper cups and the requirements of printing inks

1. Disposable paper cups are divided into cold cups and hot cups.

1. The biggest function of disposable paper cups is to hold beverages, such as carbonated drinks, coffee, milk, cold drinks, etc., which is its earliest and most basic use. Beverage paper cups can be divided into two types: cold cups and hot cups. Cold cups are used to hold cold beverages, such as carbonated drinks, iced coffee, etc.; Hot cups are used to hold hot beverages such as coffee, black tea, etc.

2. There is a layer of edible wax on the surface of the cold cup, because the cold drink will make the surface of the paper cup watery, causing the paper cup to soften, and it can be waterproof after being coated with wax. At 0~5°C, this wax is very stable and safe. However, if the temperature of the drink exceeds 62°C, the wax will melt and the hollow paper cup will absorb water and deform. Different from cold cups, a special polyethylene film is pasted on the surface of the hot cup, which not only has good heat resistance, but also is non-toxic and harmless under the immersion of high-temperature beverages.

Second, the requirements of disposable paper cup printing ink:

1. The printing ink of disposable paper cups requires good fastness to printing, and the printed matter has good acid resistance, alkali resistance, water resistance, temperature resistance, and light resistance, and will not fade, discolor, and fall off due to the action of these factors; In addition, the printed matter should have good scratch and gloss, semi-matting and matting.

2. Ink components: The components of the ink must comply with the Food Sanitation Law and the corresponding food packaging hygiene standards.

3. Residual solvent: control the amount of residual solvent to be small, in order to prevent the printed matter from producing odor, the back of the printed matter is dirty, and the solvent adheres to the substrate or substrate film at the sealing place, which will cause poor heat sealing, and form a phenomenon of poor adhesion at the sealing place or a burst of the roll mouth due to poor adhesion.

4. Drying temperature: the drying temperature of the ink should not be too high, and the surface of the base film will be peroxidized when the temperature is too high, resulting in poor heat sealing. However, it is also necessary to prevent the printing ink from drying poorly to avoid odors.

5. Selection of ink and ink solvent: the selected ink solvent should not make the PE film swell or the solvent contain water as much as possible to prevent the printed matter from curling; Inks containing plasticizable free carriers are used as much as possible to prevent the ink film and PE film from shrinking differently due to temperature changes, resulting in curling of printed matter. After the curly printed matter is die-cut into a fan-shaped sheet, it will warp, which makes it difficult to convey and roll the edge of the advertising paper cup when making the cup.

6. Environmental temperature and humidity: the humidity of the workshop is too high, and the curl of the printed matter will be formed, and the temperature of the roll film after the printing of the disposable paper cup is too high, which will cause adhesion between the upper and lower layers of the film, which will also affect the processing and forming of the paper cup in the later sequence.