Recycling and Recycling of Wood Packaging II

2) Production of wood chips and wooden sound insulation bricks using recycled wood packaging

The recovered wood packaging is removed from the nails, iron and other impurities, broken into pieces of sawdust less than 1mm in size, dried, and then mixed with a solid content of about 5%-15% of the adhesive, can produce 0.5-5mm thick wood and Wooden thin panel. Wood chips board generally use PE glue, hot pressure is 80-150kg/cm square, hot pressing temperature 130-180 degrees Celsius. The mechanical properties of this wood chip board are excellent. The mechanical strength of a wood chip board can be compared with a paper laminate board which is formed by hot pressing of 5-6 layers of paper after being impregnated with PF glue.

If the above-mentioned sawdust is mixed with clay, wood-chip sound-insulating light bricks for the construction industry can be fired. During the production, the sawdust must be screened, removed of impurities such as wood blocks, stones, etc., mixed with clay in a certain proportion, brewed with water, and then evenly mixed and sent into a brick making machine. After the wet brick is dried, it is installed. Kiln firing. Wood chips are burned during the firing process, giving off heat and leaving the pores as light bricks. This kind of light brick has good sound insulation performance and has great promotion value.

3) Production of self-lubricating materials from recycled wood packaging

With the lignocellulosic inertness, the recycled wood packaging can be used to make heavy load self-lubricating parts and their constituent materials. During the production, the wood scraps are placed in a high pressure and subjected to a vacuum treatment at room temperature to remove the volatile components and moisture, and then the thickened oil or polymerization suspension containing the polymer is injected into the autoclave and then soaked. The blanks are sent to a compression chamber and heated and pressed to re-arrange the polymers. The active material is thinned on the surface of the particles and combined 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, wood preservative impregnation treatment is also an excellent anti-biochemical corrosive material.

4) Production of Amino Wood from Recycled Wood Packaging

Using the chemical activity of the chemical components contained in the wood, the wood packaging recovered is chemically modified to produce amino wood. Amino wood can be obtained by allowing wood to react with ammonia solution or heated gaseous ammonia under normal temperature and low pressure, and pressing under pressure of 100-300 kg/cm2. 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 its price is only one tenth of that of bronze. In addition, amino wood also has excellent milling sawing, slicing processing performance, not only can be used to create parquet flooring and furniture, but also can be used to produce musical instruments, profiling machine tool models, sports equipment, bushings, bearings, gears and so on.

5) Making antique banner strips from recycled wood packaging

The wood packaging will be removed to remove nails, iron and other debris, and made into small-size 40cm plywood, and then processed into a 1cm wide plywood edge, pasted on the cloth, and wood products rolling shutter products the same, with ash The plywood strips with darker colors, such as eucalyptus, eucalyptus, eucalyptus, etc., are similar to the ancient ones.

6) Production of molded village products and modified polyvinyl alcohol plastic wood using recycled wood packaging

The wood packaging is removed to remove nails and other debris, and made into sawdust, and then the dry sawdust shake a certain amount of urea formaldehyde resin and a small amount of adjuvant chlorination, paraffin and other pre-compression, hot pressure and then filled in The prefabricated tires are once hot-pressed and the surface of the finished product is smooth and smooth, and can be sprayed directly for 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, pressure, toughness and other properties, but also has the bakelite high-strength wear and other physical properties.

7) Making composite imitation stone plates from recycled wood packaging

In Wuhan City, timber was saved and a magnesia cement was used as a cementitious material. Magnesium oxide solution was used as a shaker. Sawdust, rice straw, stone powder, hemp straw, coal ash, slag, etc. were used as filling materials. The composite imitation stone plate made of bones and bones has simple production process, smooth and colorful appearance of the product surface, high strength, light weight, and high temperature resistance. It not only maintains the material properties of the sawn nail, but also has a hard and wear-resistant material. Stone properties, products can be applied to a variety of furniture countertops, interior walls and floor decoration, etc., the market prospects are quite broad.

3, decomposition of wood packaging

Recovered wood packaging undergoes hydrolysis, pyrolysis, and other treatments to obtain important industrial products. At a certain temperature and under the action of the catalyst, the cellulose and hemicellulose of the wood pulp are hydrolyzed into monosaccharides, and then subjected to chemical and biochemical processing. Preparation, yeast, furfural, xylose, xylitol, levulinic acid, etc. product. Under atmospheric pressure and air-insulated conditions, the recovered wood packaging undergoes a pyrolysis reaction until three types of solids, liquids and gases are produced. The solid product remaining in the carbonization kettle is loose porous charcoal, which is used to make activated carbon, carbon disulfide, etc. The tan liquid product obtained after condensation of the steam gas mixture derived from the dry distillation equipment is crude wood vinegar, containing a large number of industrial products such as saturated acids, unsaturated acids, methanol, allyl alcohol, ketones, aldehydes. , Esters, phenols, butyl propyl esters, aromatic polymers, heterocyclic compounds, and methylamines; the product of the steam gas mixture derived from the dry equipment, which is separated by condensation, is called wood gas or non-condensable gas. The main components of wood gas are carbon dioxide, carbon monoxide, methane, ethylene, hydrogen, etc. It is an excellent gaseous fuel that does not pollute the environment.

4, summary

With the increasing shortage of forest resources, the comprehensive utilization of wood packaging has become a common concern in countries all over the world. This article focuses on the recycling of wood packaging waste from the aspects of recycling, machinery [chemical treatment and decomposition treatment, etc.]. When dealing with the comprehensive utilization of wood packaging, first consider recycling and reuse, and at the same time comprehensively consider the mechanical chemical treatment and decomposition treatment of wooden packaging to make various industrial products and other products, in order to exert good social and economic benefits.

Author: Xu Xu Meng Yan Long brown bear