Study On The Preparation Technology Of EP-EPS Cushion Packaging Materials

In the buffer Packaging field, the consumption of expanded polystyrene (EPS) continues to increase each year, by 2007, the consumption in China has reached 401 thousand tons, accounting for 27% of total consumption. "White Pollution" which is caused by EPS can not have been ignored and EPS annually consume a large amount of valuable oil resources, which bring a heavy burden for the environment and the economy.Paper summarizes the development status of buffer packaging materials and the various recovery methods of EPS, and analyzes the advantages and disadvantages of them:Studies how to product the cushioning packaging materials by using the recovery EPS which is processed into granules, expanded perlite (EP), recycled fiber (RCF) and adhesives (EVA), etc.which has been methods and technology of EP-EPS cushioning packaging materials; For EP-EPS cushioning packaging materials has completed the static compression performance tests, dynamic cushioning performance testing and so on, and compared with EPS, EPE cushioning packaging materials, evaluates the cushioning properties of EP-EPS cushioning packaging materials.EP-EPS cushioning packaging materials not only can solve the problem of environmental pollution caused by EPS, but also can save the precious oil resources, and achieves Circular Economy which is from cushioning packaging materials to cushioning packaging materials, with good social and economic benefit.There are the following conclusions through experiments and analysis.1. EVA emulsion is an ideal adhesive in this experiment, it has good bonding properties and because it can dissolve in water, so it is a water-based adhesive and will not cause secondary pollution to the environment. Same time, it can also prevent the EP dregs, so that the buffer has a good surface appearance.2. The preparation process of EP-EPS cushioning packaging materials:(1) Put EP particles into the dilution of the EVA emulsion about 5 minutes, and then remove and dry them;(2) Put the purchased RCF (dry mass) into containers that hold water with about 1:10 ratio (mass ratio), and mixing with the high-speed mixer, then put the mixture into the dissociation machine, get the RCF after dissociation;(3) After wetting the recovery EPS particles with water, put them into the RCF solution, then make the mixture fully mix with the high-speed mixer;(4) Put the pretreatment EP into the EPS and RCF mixture and add a small amount of EVA emulsion, and mix in high-speed mixer so that make all components fully mix;(5) Put the slurry into the mold, extrusion molding, release after molding and dry in the oven. In order to improve drying speed, add a small amount of ethanol.drying time can be shortened. 3.Study the elements that affect the cushioning properties of EP-EPS cushioning packaging materials, which indicate:(1) With the content of EP increasing, the lowest point of the buffer coefficient moves left, the buffer factor-maximum static stress curve moves upward, indicating strength of EP-EPS cushioning packing materials has increased, the buffer coefficient becomes larger, the buffer efficiency is low;(2) With the content of RCF increasing, the buffer factor-maximum static stress curve moves upward, indicating the buffer factor has increased, the buffer efficiency has reduced;(3) The concentration of EVA emulsion has no impact on cushioning properties of EP-EPS cushioning packaging materials.4. The static performance of EP-EPS cushioning packaging materials renders non-linear curve, the basic shape is similar to the tangent curve. When the static stress is larger than 0.28kg/cm2, the cushioning properties of EP-EPS cushioning packaging materials is better than EPE; when the static stress is less than 1.89kg/cm2, the cushioning properties of EP-EPS cushioning packaging materials is more efficient than EPS.5. EP-EPS cushioning packing materials have good cushioning properties, especially has a good protective effect for the product,when fragility value is 15.9g-32.4g, and the corresponding static stress range is 0.64-1.52kPa.6. The preparation technology approach of EP-EPS cushioning packaging materials is good, mainly reflected as the following aspects:(1) Rich in raw materials and cheap;(2) Cushioning properties can be carried out by changing the ratio of raw materials;(3) The mixture results of EPS, EP particles and RCF were better, Experiment conditions is easy to implement;(4) The process is simple, no foaming process;(5) Solve fundamentally the "White Pollution" environmental problems caused by EPS, and achieves Circular Economy which is from cushioning packaging materials to cushioning packaging materials.