Method for removing surface coating of reflective PET (Polyethylene Terephthalate) aluminium plating film

A technology of surface coating and reflective film, applied in the field of removing the surface coating of PET aluminized reflective film, can solve the problems of PET's "yellowing, power consumption, increased white pollutant emissions, etc., to achieve recycling and cost savings. Effect
CN102443804AInactive Publication Date: 2012-05-09CHANGZHOU VOCATIONAL INST OF ENG +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHANGZHOU VOCATIONAL INST OF ENG
Publication Date
2012-05-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a PET (Polyethylene Terephthalate) reflective film, in particular to a method for removing the surface coating of a reflective PET aluminium plating film. The method is characterized by comprising the steps of: immersing the reflective PET aluminium plating film into a cleaning solution, and heating at the temperature of 40-100 degrees centigrade, rinsing by using clean water to remove the coating adhered on the PET surface, and airing to obtain the recyclable PET film. The recycled PET film is colourless and transparent on the appearance and has the intrinsic viscosity being about 0.723; the melt strength of the recycled PET film can satisfy requirements of PET extrusion-blown molding (bottle) or even extrusion blown film; and in the same extrusion technological conditions, the intrinsic viscosity of the PET film, which has a yellow appearance and is recycled by using the traditional method of hermetically boiling by using 20% caustic soda at high temperature for more than 24 hours, is reduced to about 0.564 and cannot satisfy the requirements of the extrusion-blown molding (bottle). The test in the invention proves that the method has the advantages of high-efficiency technology, time / water / electricity-saving performance, environment friendliness, zero discharge of waste water and practicability, is benefiical to realization of recycle of the reflective PET aluminium plating film, and is suitable for recycling and practical.
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Description

technical field

[0001] The invention relates to a PET reflective film, in particular to a method for removing the surface coating of the PET aluminized reflective film. Background technique

[0002] PET film is vapor-deposited by a high-vacuum coating machine. It has bright metallic luster, excellent gas and light barrier properties, and good moisture-proof, heat-resistant, and puncture-resistant properties. It can replace aluminum foil and other advantages and can be widely used. Food packaging, high-end industrial packaging, compounding, printing, self-adhesive labels, etc., and has excellent adaptability to printing, packaging, and bonding. However, the scraps of PET reflective film in electronics factories and the recycled and aged PET reflective film are usually discarded directly, causing the discharge of "white pollutants" to increase day by day, and the pollution is becoming more and more serious; Great attention has been paid to the recycling system of waste PET re...

Claims

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