APET packaging sheet capable of being heat-sealed at high frequency and preparation method thereof

Abstract

The invention discloses an amorphous polyethylene terephthalate (APET) packaging sheet capable of being heat-sealed at high frequency and a preparation method thereof. The sheet comprises the following raw materials in part by mass: 40 to 100 parts of APET, and 2 to 5 parts of stryenemaleic anhydride (SMA). The preparation method of the APET packaging sheet capable of being heat-sealed at high frequency comprises the following steps of: uniformly mixing the raw materials, and drying; and placing the mixture of the raw materials in a polyethylene terephthalate (PET) extrusion sheet machine setand performing extrusion molding. The APET packaging sheet capable of being heat-sealed at high frequency, which is provided by the invention has high high-frequency seal efficiency, the formed sheetis transparent and meets the requirement of food and drug administration (FDA), and the APET packaging sheet capable of being heat-sealed at high frequency is suitable for the fold package of cosmetics, foods, toys, printing and the like or low-draw-ratio blister packages, has low cost, and is low in energy consumption, the production equipment and process are simple; and the recovery material can be recycled.

Description

technical field [0001] The invention relates to a high-frequency heat-sealable APET packaging sheet and a preparation method thereof. Background technique [0002] With the rise of plastic sheet packaging, research on heat-sealable sheets has gradually become a research hotspot, but most heat-sealing technologies are limited to plastic films, because the thickness of plastic sheets is relatively large, and traditional heating methods The sealing method is inefficient, consumes a lot of energy, and the heat sealing effect is not very good. [0003] High-frequency heat sealing is a packaging method that has emerged in recent years. Its principle is to use high-frequency electric fields to make polar groups in dielectric materials polarized and oriented. Because the direction of the electric field is constantly changing, the polar groups are also repeatedly oriented. , continuous torsional movement, thus continuous friction and heat generation, and finally welding and sealing....

AI Technical Summary

Problems solved by technology

Although these technologies can reduce costs to a certain extent, they have higher requirements for equipment and technology, and there is also the problem that recycled materials are difficult to reuse

Recently, the research on heat-sealable APET has been developing in the direction of blending: some scholars have achieved the heat-sealing effect by adding low-melting-point polar materials with better compatibility with PET. This method requires more low-melting-point materials to be added ( The addition amount should reach 30-50%), but the cost is relatively high