Characteristics of liquid soft plastic packaging film The film material used for liquid flexible plastic packaging films is mainly polyethylene (PE) co-extruded film, which must meet the requirements of packaging printing, processing, storage and transportation and hygiene. From the appearance of the film, it can be divided into three categories: soft milky white PE film, black and white co-extruded PE film, and hard high temperature cooking PE film. Soft milky white PE film is mainly used in simple liquid packaging such as milk, soy sauce, vinegar, etc. The co-extruded film blowing masterbatch is composed of LDPE, LLDPE and milky white material. The film has poor barrier performance, the sterilization temperature does not exceed 90 ℃, and the shelf life is relatively short; it is generally used in manual or low-speed filling equipment. For example, low-grade milk packaging, the general shelf life is up to three days, sold nearby. The black-and-white film is mostly three layers, with a maximum of five layers. During film blowing, the added middle layer is formed by co-extrusion of the barrier masterbatch. The black masterbatch in the inner layer of the heat seal plays a role of blocking light and blocking ultraviolet rays. Due to the existence of the intermediate barrier layer, it is composed of E-VA, EVAL and other master batches. The shelf life of the contents is longer and can be maintained for more than 30 days. It is composed of barrier masterbatch, so this black and white film also belongs to the first category. Among the three types of films, black and white films are the most unfavorable for printing operations. When the black and white film is formed, the amount of slip agent and brightener contained is the largest, to meet the requirement of small friction coefficient of the black and white film on the high-speed automatic filling machine. The adhesion performance of the ink layer. Most of the high-speed automatic filling machines are directly equipped with a hot hydrogen peroxide sterilization system, which is used for sterilization of packaging films. In this case, we must pay attention to the effect of sterilization conditions on the ink layer, because some pigments in the ink are not very antioxidant. Tests have shown that the oxidizability of hydrogen peroxide significantly increases with increasing temperature. Therefore, when providing packaging materials, color printing manufacturers must clearly understand the post-processing conditions of customers. The hard high-temperature cooking PE film is mainly used for dairy products such as yogurt and soy milk. When the contents are sterilized after filling, the ultra-high temperature sterilization process is used. The hard co-extruded PE film is mainly composed of HDPE masterbatch, adding some LDPE and colored masterbatch. Therefore, the hard PE film has good high temperature resistance and can meet the requirements of ultrahigh temperature sterilization. Due to the pressure difference during sterilization, it is easy to produce "bulging" phenomenon, so it is required that the rigid PE film not only has good heat seal strength, but also has good tensile strength performance. Color printing manufacturers generally use "three meters high" or "One-footed" test effect. Printing ink used in liquid flexible plastic packaging film Liquid packaging films such as milk and beverages are usually printed by surface printing. Most of them are polyamides or modified as connecting materials. This type of ink is the earliest developed in China's gravure ink, and the production process is relatively mature and perfect. This type of ink is suitable for polyethylene and polypropylene films. The ink layer has good adhesion fastness and good gloss; but the polyamide ink has poor water resistance, oil resistance, and freezing resistance. Printing this type of ink in high-temperature summers is prone to stickiness and softening. When printing in low-temperature winters, freezing will occur. Liquid packs are subjected to high-temperature sterilization or freezing during post-processing such as filling, circulation and storage. Therefore, the inherent defects of polyamide-based surface printing inks cannot meet the requirements of liquid packaging. Color printing manufacturers that produce liquid packs For different types of co-extruded PE films, non-polyamide based surface printing inks must be selected. Currently, the most suitable liquid package inks on the market are polyesters and modified products. There are single-liquid and double-liquid reactive types. Ink. Because milk and beverages are for human consumption, packaging films, printing inks, etc. should also meet the requirements of packaging material hygiene standards and food packaging regulations. Therefore, the inks used for printing should be non-toxic, odorless, and have little residual solvents. Does not contain toxic heavy metals and other requirements.
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Brand Name: Jinao
Place of Origin: Guangdong, China(mainland)
Surface Material: Customized
Inner Material: Velvet / foamed plastic
Color: Customized
Size: Multi-size + Customized
Feature: shining
Logo Printing: Customized
Usage: Jewelry Box / Gift Box
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