The process and material requirements for the production of disposable paper cups
The heat sealing performance and printing adaptability required for the processing of disposable paper cups require that inks, solvents, and dryness must be suitable for paper cups. The quality of paper cups is the result of the combination of paper cup printing process, paper cup printing paper, and paper cup printing ink.
Usually in the printing of paper cups, flexographic water-based inks with good adhesion are used, so that the performance of paper cups is relatively improved in light resistance, heat resistance, acid and alkali resistance, and the occurrence of discoloration, fading, color falling off and other phenomena is reduced. In addition, the composition of the ink must comply with the Food Sanitation Act and the corresponding food packaging hygiene standards.
The solvent of the ink used in the printing of disposable paper cups cannot be swelled with PE film, nor can it contain water imposition to avoid curling the paper cups. The amount of residual solvent after printing should be small to prevent friction from staining the printed matter. If the solvent is applied to the seal, it will also cause the seal to be not tight, the adhesion is poor, and even the roll mouth and burst mouth will appear.
After the paper cup printing is completed, the drying temperature of the paper cup printing should not be too high, and when the temperature is too high, the surface of the base film will produce a peroxidation reaction, resulting in poor heat sealing. If the relative humidity in the workshop is too high, it will also cause the disposable paper cups to curl. After printing, the roll film will stick between the upper and lower layers in the environment with too high temperature, which will affect the subsequent processing and molding of disposable paper cups.
Paper cup printing production material: The state stipulates that disposable paper cups "cannot artificially add fluorescent brighteners". Disposable paper cups are divided into cold drink cups and hot drink cups according to their use. Once misused or misused, it will affect the health of the body. The raw material for the coated waterproof layer in the disposable paper cup is polyethylene. The inferior paper cups are made of recycled polyethylene, which will produce many harmful substances in the process of processing and production. The paper cup is coated with a layer of polyethylene water barrier film on the inside to achieve the water insulation effect.
The surface of the cold drink paper cup needs to be impregnated with wax or waxed to achieve the effect of waterproofing. When the water temperature exceeds 62 degrees, the stability of the wax weakens and the paper cup softens. Substances that may cause cancer are ingested by the body along with water. The surface of the hot drink cup is pasted with a special polyethylene film that has been approved by the state, which has good heat resistance and is non-toxic.
In addition, there are also standards for the thickness and permeability of disposable paper cups, and the bottom and sides of the cups cannot be permeable or permeable, and the paper should not be too soft.
For more information about the process of disposable paper cups and the material of disposable paper cups, please go to the website of Biyin Bazaar to learn more, or: Go directly to: Biyin Bazaar Products > Daily Office > Disposable Paper Cup channel to view various products in detail.