Wood packaging consumes a lot of wood. Our country is Missouri's lack of wood country. In order to alleviate the increasingly conspicuous contradiction between supply and demand of timber, we must first develop large-scale artificial fast-growing and high-yield timber forests and plan to protect existing forest resources. Second, we must vigorously develop the forestry industry, fully utilize forest resources, and effectively recycle wood waste. . The recycling of wooden packaging, which consumes a lot of forest resources, is an urgent issue in China. This article focuses on the resource utilization of wood packaging materials from the perspective of green packaging.
In general, the resource utilization of wood packaging waste is the use of variable-function materials. The variable-function material utilizes the exhaustive properties of the recycled packaging material and is reprocessed for use in non-packaging applications. This cumulative performance refers to the discovered and undiscovered properties of the material pool. Wood packaging waste can be used for a variety of purposes. It can be burned for energy use, or it can be recycled using physical, chemical, or mechanical processing techniques or processes.
The resource utilization methods of wood packaging recycling mainly include recycling, mechanical chemical treatment and decomposition treatment.
1. Recycling and reuse of wood packaging Recycling and reuse of wood packaging is mainly used to return wood packaging to the manufacturer for the use of the original product packaging. This reuse can be fixed-point long-term supply. Site-specific recovery and export bilateral agreements. Fixed-point long-term supply is suitable for manufacturers who provide products to another region or regions for a long time. The fixed-point recycling is applicable to product packaging with large circulation of goods and short circulation distance. For packaged export products, certain bilateral agreements for packaging and recycling can be established so that used wood packaging can be recycled in cross-border circulation.
Recycling and reuse of wood packaging is the first choice for the recycling of wood packaging.
2. The mechanical or chemical treatment of wood packaging uses mechanical or chemical treatment methods. Waste wood packaging can be used to produce wood-based panels, wood chips, floors, self-lubricating materials, and amino wood products.
1) Production of Wood-based Panels from Recycled Wood-based Panels Wood-based panels are good wood materials that replace solid wood and are widely used in furniture manufacturing, interior decoration, construction industry, and vehicle and ship manufacturing, involving industries such as industry, agriculture, military, and construction. The vigorous development of wood-based panels can not only adjust the industrial structure of the wood processing industry, make rational use of forest resources, but also play an irreplaceable role in promoting the cultivation and development of resources. The wooden materials used for wooden boxes and other wooden packaging containers are relatively high, their twill slope is generally less than 1/10, the diameter of the wood section is generally less than 1/3 of the width of the wood, and there is no more than 1.2 knot hole and insect eye on the plate. , dead knots and leaks, nails and no ends at both ends. Recycled wooden packaging, remove metal accessories such as iron nails and iron sheet, and after breaking, it is used to make artificial boards such as particle board, fiber board and particle board. Excellent raw materials.
Manufacture of wood particle board The wood particle board is a kind of wood-based board product that uses wood scrap as the main raw material, adds a certain amount of adhesive and is pressed at a certain temperature, and its production process mainly includes scrap material preparation, scrap materials Drying, scrap sorting, adhesive preparation, de-emulsion, slab paving, slab hot pressing, surface treatment, classification and inspection processes. Nowadays, adhesives used for making particleboard at home and abroad are mainly UF adhesives, PF and MUF. In order to improve the quality and added value of products, it is not allowed to perform secondary processing on the plates, and decorative materials such as panels, decorative plates, and plastic films are mounted on the surface to improve the decorative effect thereof.
In addition, the use of recycled wood packaging can also produce plasterboard and cement particle board and other building materials. Gypsum chipboard has good processing performance, can be sawed, milled, slotted, punched, nailed, screwed, etc., mainly used for interior decoration, such as partitions, ceilings, floors and so on. Cement particle board is an excellent building material.
Making wood fiberboards Wood fiberboards are a type of wood-based board produced using wood chips as the main raw material. Its manufacturing process mainly includes preparation, fiber separation, fiber drying, fiber separation, rubber, slab pavement, slab hot pressing, post-processing, surface processing and other processes. In recent years, the production of medium-density fiberboard in China has been developing at a very rapid pace and has a promising future.
2) Using recovered wooden packaging to produce wood chips and wooden sound insulation bricks. After removing the nails, tin and other impurities from the recovered wood packaging, the sawdust will be broken into pieces with a particle size of less than 1 mm, dried, and then solid content will be about 5%-15%. The adhesive blend can produce 0.5-5mm thick wood thin and wood thin panels. 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) The use of recycled wood packaging to produce self-lubricating materials The use of lignocellulosic inertness makes it possible to use the recycled wood packaging for the manufacture of parts and their constituent materials for self-lubrication of heavy loads. 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) The use of recycled wood packaging for the production of amino wood uses the chemical activity of the chemical components contained in the wood, chemical modification of the recovered wood packaging, and the production of 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) Use recycled wooden packaging to produce antique banner strips to remove the wood packaging from iron nails, iron and other debris, and make small-size plywood 40cm, and then processed into 1cm wide plywood strips, paste on the cloth, and wood The rolling products of the products are the same, and the banners made of plywood strips with darker colors such as Ash, Beech, Basswood are similar to the ancient ones.
6) The use of recycled wood packaging to obtain mold village products and modified polyvinyl alcohol plastic wood will remove the wood packaging to remove nails and other debris, and make sawdust, and then shake the dry sawdust a certain amount of urea formaldehyde resin and A small amount of adjuvants such as chlorinated contend, paraffin wax, etc. are pre-pressed, hot-pressed and pressed into a prefabricated carcass and then heat-pressed to form a smooth surface. The finished product can be sprayed directly, used for watch cases, furniture and certain handicrafts, etc. .
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) Production of Composite Faux Stone Panels from Recycled Wood Packing Wood from Wuhan Saved to Invent a Magnesium Oxide Cementing Material, Magnesium Oxide Solution as Shaking Agent, Sawdust, Straw, Stone Powder, Hemp Straw, Coal Ash , slag and other fillers, composite bamboo board made of bamboo fiber, glass fiber as the bone material, its production process is simple, the product surface smooth color pattern natural, high strength, light weight, high temperature, not only to maintain the saw The material properties of nails can also be used as hard and wear-resistant stone materials. The products can be applied to various furniture countertops, interior wall surfaces and floor decorations, etc. The market prospect is quite broad.
3. Decomposition treatment of wood packaging The recovered wood packaging can be treated with hydrolysis, pyrolysis, etc. 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 In today's increasingly shortage of forest resources, the comprehensive utilization of wood packaging has become a common concern in countries around 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.
In general, the resource utilization of wood packaging waste is the use of variable-function materials. The variable-function material utilizes the exhaustive properties of the recycled packaging material and is reprocessed for use in non-packaging applications. This cumulative performance refers to the discovered and undiscovered properties of the material pool. Wood packaging waste can be used for a variety of purposes. It can be burned for energy use, or it can be recycled using physical, chemical, or mechanical processing techniques or processes.
The resource utilization methods of wood packaging recycling mainly include recycling, mechanical chemical treatment and decomposition treatment.
1. Recycling and reuse of wood packaging Recycling and reuse of wood packaging is mainly used to return wood packaging to the manufacturer for the use of the original product packaging. This reuse can be fixed-point long-term supply. Site-specific recovery and export bilateral agreements. Fixed-point long-term supply is suitable for manufacturers who provide products to another region or regions for a long time. The fixed-point recycling is applicable to product packaging with large circulation of goods and short circulation distance. For packaged export products, certain bilateral agreements for packaging and recycling can be established so that used wood packaging can be recycled in cross-border circulation.
Recycling and reuse of wood packaging is the first choice for the recycling of wood packaging.
2. The mechanical or chemical treatment of wood packaging uses mechanical or chemical treatment methods. Waste wood packaging can be used to produce wood-based panels, wood chips, floors, self-lubricating materials, and amino wood products.
1) Production of Wood-based Panels from Recycled Wood-based Panels Wood-based panels are good wood materials that replace solid wood and are widely used in furniture manufacturing, interior decoration, construction industry, and vehicle and ship manufacturing, involving industries such as industry, agriculture, military, and construction. The vigorous development of wood-based panels can not only adjust the industrial structure of the wood processing industry, make rational use of forest resources, but also play an irreplaceable role in promoting the cultivation and development of resources. The wooden materials used for wooden boxes and other wooden packaging containers are relatively high, their twill slope is generally less than 1/10, the diameter of the wood section is generally less than 1/3 of the width of the wood, and there is no more than 1.2 knot hole and insect eye on the plate. , dead knots and leaks, nails and no ends at both ends. Recycled wooden packaging, remove metal accessories such as iron nails and iron sheet, and after breaking, it is used to make artificial boards such as particle board, fiber board and particle board. Excellent raw materials.
Manufacture of wood particle board The wood particle board is a kind of wood-based board product that uses wood scrap as the main raw material, adds a certain amount of adhesive and is pressed at a certain temperature, and its production process mainly includes scrap material preparation, scrap materials Drying, scrap sorting, adhesive preparation, de-emulsion, slab paving, slab hot pressing, surface treatment, classification and inspection processes. Nowadays, adhesives used for making particleboard at home and abroad are mainly UF adhesives, PF and MUF. In order to improve the quality and added value of products, it is not allowed to perform secondary processing on the plates, and decorative materials such as panels, decorative plates, and plastic films are mounted on the surface to improve the decorative effect thereof.
In addition, the use of recycled wood packaging can also produce plasterboard and cement particle board and other building materials. Gypsum chipboard has good processing performance, can be sawed, milled, slotted, punched, nailed, screwed, etc., mainly used for interior decoration, such as partitions, ceilings, floors and so on. Cement particle board is an excellent building material.
Making wood fiberboards Wood fiberboards are a type of wood-based board produced using wood chips as the main raw material. Its manufacturing process mainly includes preparation, fiber separation, fiber drying, fiber separation, rubber, slab pavement, slab hot pressing, post-processing, surface processing and other processes. In recent years, the production of medium-density fiberboard in China has been developing at a very rapid pace and has a promising future.
2) Using recovered wooden packaging to produce wood chips and wooden sound insulation bricks. After removing the nails, tin and other impurities from the recovered wood packaging, the sawdust will be broken into pieces with a particle size of less than 1 mm, dried, and then solid content will be about 5%-15%. The adhesive blend can produce 0.5-5mm thick wood thin and wood thin panels. 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) The use of recycled wood packaging to produce self-lubricating materials The use of lignocellulosic inertness makes it possible to use the recycled wood packaging for the manufacture of parts and their constituent materials for self-lubrication of heavy loads. 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) The use of recycled wood packaging for the production of amino wood uses the chemical activity of the chemical components contained in the wood, chemical modification of the recovered wood packaging, and the production of 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) Use recycled wooden packaging to produce antique banner strips to remove the wood packaging from iron nails, iron and other debris, and make small-size plywood 40cm, and then processed into 1cm wide plywood strips, paste on the cloth, and wood The rolling products of the products are the same, and the banners made of plywood strips with darker colors such as Ash, Beech, Basswood are similar to the ancient ones.
6) The use of recycled wood packaging to obtain mold village products and modified polyvinyl alcohol plastic wood will remove the wood packaging to remove nails and other debris, and make sawdust, and then shake the dry sawdust a certain amount of urea formaldehyde resin and A small amount of adjuvants such as chlorinated contend, paraffin wax, etc. are pre-pressed, hot-pressed and pressed into a prefabricated carcass and then heat-pressed to form a smooth surface. The finished product can be sprayed directly, used for watch cases, furniture and certain handicrafts, etc. .
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) Production of Composite Faux Stone Panels from Recycled Wood Packing Wood from Wuhan Saved to Invent a Magnesium Oxide Cementing Material, Magnesium Oxide Solution as Shaking Agent, Sawdust, Straw, Stone Powder, Hemp Straw, Coal Ash , slag and other fillers, composite bamboo board made of bamboo fiber, glass fiber as the bone material, its production process is simple, the product surface smooth color pattern natural, high strength, light weight, high temperature, not only to maintain the saw The material properties of nails can also be used as hard and wear-resistant stone materials. The products can be applied to various furniture countertops, interior wall surfaces and floor decorations, etc. The market prospect is quite broad.
3. Decomposition treatment of wood packaging The recovered wood packaging can be treated with hydrolysis, pyrolysis, etc. 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 In today's increasingly shortage of forest resources, the comprehensive utilization of wood packaging has become a common concern in countries around 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.
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