Research on the Classification, Recycling and Reuse of Packaging Waste II

Second, the recovery and use of wood packaging waste

Wood is one of the most important materials for packaging. Wood can be used to make various types of transport packaging containers and high-end sales packaging. The arbitrarily discarded large amount of wood packaging waste not only pollutes the natural environment, but also wastes valuable resources. The recycling and use of wood packaging wastes are usually recycled, mechanically or chemically treated.

1. Recycling and reuse of wood packaging

Recycling and reuse of wood packaging is the centralized recycling of waste wood packaging, and then returned to the manufacturer for the original product packaging method. This kind of recycling and reuse has three methods: fixed-point long-term supply, fixed-point timing recovery, and export bilateral agreement. Fixed-point long-term supply is suitable for manufacturers who provide products to other regions for a long time. Fixed-point timing recovery is suitable for product packaging with large circulation of goods and short circulation distance. The bilateral agreement on export is applicable to the packaging of export products through the establishment of certain bilateral agreements for packaging and recycling, so that used wood packaging can be recycled in transnational circulation.

Recycling and reuse of wood packaging is the preferred way to recycle and use wood packaging waste.

2. Mechanical or chemical treatment of wood packaging

Using mechanical or chemical treatment methods, waste wood packaging can be used to manufacture products such as flooring, fiberboard, self-lubricating materials, and amino wood.

1Manufacture of wood fiberboard

Wood fiberboard is a kind of wood-based board produced using wood scrap as a main raw material. Its manufacturing process includes preparation, fiber separation, fiber drying, fiber grading, rubber mixing, slab pavement, slab hot pressing, post-processing, surface processing and other processes.

2 production of self-lubricating materials

With the lignocellulosic inertness, the recycled wood packaging can be used to make heavy load self-lubricating parts and their constituent materials. At the time of production, the wood scraps are placed in an autoclave and subjected to vacuum treatment at room temperature to remove volatile components and moisture, and then the thickened motor oil or polymerization suspension containing the polymer is injected into the autoclave and then impregnated. The blanks are sent to a compression chamber and heated and pressed to re-arrange the polymers. The active material sinks on the surface of the particles and combines with lignin to form a monolithic material to obtain the desired properties. Wood composite materials have been widely used in electrical insulation industrial production. In addition, after the wood is impregnated with a preservative, it is also an excellent anti-biochemical corrosive material.

3 production of amino wood

Using the chemical activity of the chemical components contained in the wood, the wood packaging recovered can be chemically modified to produce amino wood. Under normal temperature and low pressure, the wood is reacted with ammonia solution or heated gaseous ammonia and pressed at a pressure of 100 to 300 kg/cm2 to obtain amino wood. This is an excellent new type of material with low production cost, strong resistance to biochemical corrosion, strength not only better than all wood, but also higher than bronze, and the price is only 1/10 of that of bronze. In addition, amino wood also has excellent milling, sawing, planing, cutting and other processing performance, not only for the production of parquet flooring and furniture, but also for the production of musical instruments, sports equipment, bushings, bearings, gears and so on.

4 Making Antique Simplified Banner

The wood packaging will be removed from the nails, iron and other debris, and made of small-size plywood 40cm, and then processed into 1cm wide plywood side strips, affixed to the cloth, and wood shutter doors the same product, with ash, The plywood strips with darker colors such as coffins and eucalyptus are similar to the ancient Chinese scrolls.

5 Preparation of molded products and modified polyvinyl alcohol plastic wood

The recovered wood packaging removes nails and other debris, and is made into sawdust, and then the dry sawdust is mixed with a certain amount of urea formaldehyde resin and a small amount of auxiliary agent ferric chloride, paraffin, etc., pre-pressed, hot-pressed, and filled in The prefabricated billet is once hot-pressed and the surface of the finished product is smooth and smooth, and can be sprayed directly for the production of watch cases, furniture and certain handicrafts.

If the above sawdust is mixed with polyvinyl alcohol, aggregating agent, epoxy resin and curing agent, plastic wood products can be made. Polyvinyl alcohol has good processing properties and wear, oil resistance, pressure resistance, toughness and other characteristics, but also has the bakelite high-strength wear and other physical properties.

(Author: Fang Changqing Tommy)

Guangdong Packaging Magazine