Aseptic paper packing material separation method based on ultrasonic pretreatment

Abstract

The invention discloses an aseptic paper packing material separation method based on ultrasonic pretreatment. The method comprises the following steps that an aseptic paper packing material is cut into small pieces, then the small pieces are immersed in a container with water solution, and the solid material is completely immersed below the liquid level; the ultrasonic treatment is carried out, the time lasts 2-8 hours, the power of an ultrasonic generator is 200-2700W, and the ultrasonic frequency is 25-100KHz; after waste paper is torn up, the waste paper and a mixture of the aseptic paper packing material subjected to the ultrasonic pretreatment and water are put in a pulper together to be repulped for 15-40 minutes; the repulped size is put in a pulp screen to be screened, and the aluminum plastic part is screened out; and good size after screening is collected. Through the ultrasonic pretreatment, under the conditions of the same repulping strength and time, the method can significantly increase the separation efficiency of each part of the aseptic paper packing material, fully recycles paper, aluminum and plastic, increases the quality of recycled materials, and further increases the economic benefits of recycling.

Description

technical field [0001] The invention relates to the separation of paper packaging materials, in particular to the separation of paper, aluminum and plastic in aseptic paper packaging, and specifically to a method for the efficient separation of aseptic paper packaging materials, which belongs to the efficient recycling of waste packaging and secondary fiber recycling. with technical fields. Background technique [0002] Aseptic paper packaging is a packaging system based on food-specific cardboard, generally divided into 6 to 7 layers, composed of paper, polyethylene and aluminum foil, etc., in terms of weight percentage, the proportion of the main material is roughly 75% of paper %, polyethylene film 20%, aluminum foil 5%. Among them, cardboard is the main raw material, and the composition is mainly high-quality kraft wood pulp, which is used to ensure the firmness of the entire package; polyethylene film is a commonly used plastic used to seal liquids and protect products...

AI Technical Summary

Problems solved by technology

Compared with these several technologies, although the processing cost of the latter two is relatively low, they do not fully reuse the high-quality materials in the waste bags, and the utilization level is not high, resulting in considerable waste. In the long run, such products must be used The reuse problem after the cycle may become a new problem, so it is suitable as a method for the transition period, not a good recipe for long-term development; the first two methods are to separate the materials, and the cost of processing may be higher. However, it can restore various materials and increase the value of recycling, which has certain development prospects.

The problems of the separation treatment method are: the chemical separation method generally uses high-strength acids, alkalis or organic solvents, which will damage the materials in the packaging to a certain extent, and will affect the use of recycled products, and the application range is limited; Although pulping is currently the most widely used recycling treatment method for waste paper, for materials such as composite paper packaging, conventional pulping conditions cannot effectively separate the paper and aluminum-plastic parts. Pulping time and accelerating the pulping rotor speed and other methods will also cause damage to various parts of the material and reduce the quality of recycled materials