WO2012048641A1

WO2012048641A1 - Regenerated wood pencil and process for producing the same

Info

Publication number: WO2012048641A1
Application number: PCT/CN2011/080696
Authority: WO
Inventors: 马铭远
Original assignee: Ma Mingyuan
Priority date: 2010-10-12
Filing date: 2011-10-12
Publication date: 2012-04-19
Also published as: CN102001249A

Abstract

The present invention provides a regenerated wood pencil and a process for producing the same; the raw materials used in the regenerated wood pencil are classified by category into: the rod material, the core material, and the lacquer material; the characteristic weight ratio of these three raw materials is: rod material : core material : lacquer material being 9 : 1 : 1. The regenerated wood pencil uses plastic instead of wood, which saves wood.

Description

Recycled wood pencil and production process

Technical field

The invention relates to a pencil and a manufacturing process, in particular to a recycled wood pencil and a manufacturing process which are produced by plasticizing non-toxic plastics and recycled wood powder. Background technique

Pencils are indispensable consumables for students, children and various social groups to learn and work in the office. They have a broad market and a large demand. Looking back at history, humans have used wood to make pencils for more than 300 years. It can be said that the more humans enter civil society, the wider the application rate of pencils. The future pencil market will increase demand as the population grows. Low value and easy consumption are the characteristics of a pencil, and it is also permanent.

According to the latest statistics, the current global average consumption of more than 13 billion pencils, behind this high demand is the annual consumption of 650,000 cubic meters of high-quality wood, which will cause major damage to the earth's ecological balance, so today's developed countries have long This kind of wood pencil, which is a high cost to destroy the ecological balance, is no longer produced, and the procurement land has been turned to China. China has become the world's largest producer of wood pencils, with an annual output of more than 9 billion, accounting for 70% of global production, including more than 7 billion exports, but also in short supply, demand has always been rising rapidly. The production of the above-mentioned wooden pencils in China requires 450,000 cubic meters of high-quality wood every year, which means that tens of thousands of green spaces disappear every year in China! The floods of the Yangtze River, the cutoff of the Yellow River, the drought in Yunnan, the mudslides in Sichuan, and the sand dust in Yanjing are all related to the destruction of the Earth's ecological balance. This situation will make us feel "shudder"! Wood pencils that consume so much quality wood each year for production will have an unshirkable historical responsibility.

After entering the 1990s, due to the increasingly tight global supply and demand contradictions, the value of wood pencils has also risen, from a few cents in the 1980s to a few cents. In this case, looking for a kind of energy. New technologies and new research projects that replace wooden pencils are placed in front of the world. Although there are some pencils with plastic or paper-based pens, they still can't replace people's preference for wood pencils in terms of environmental protection, habits and economy. So there is no good solution. Summary of the invention

In order to solve the contradiction between the above requirements and environmental protection, the present invention provides a regenerated wood pencil and a manufacturing process thereof, and the pencil made by the regenerated wood pencil manufacturing process is not only non-toxic and environmentally friendly, but also has a functional effect, a shape and a specific gravity. They are all the same as solid wood pencils, and the biggest feature is that they can save a lot of high-quality wood. In addition, the production process uses a single molding process, which is convenient and efficient, and the investment is less effective, which is conducive to promotion. . The pencils produced by this patented technology are cheaper than wooden pencils, and all aspects of economic benefits are superior to wood pencils. They can completely replace wooden pencils and gain public recognition and love.

The specific technical solutions adopted by the present invention to solve the technical problems thereof are:

(1) The recycled wood pencil and the raw materials used in the production process are divided into pen material, pen core material and coated paint according to the class. The weight ratio of the three raw materials is: pen material: pen core material: the paint material is 9:1 The pen material includes: recycled polyethylene, polystyrene and polypropylene: 40~70%, wood powder: 15~25%, the wood powder includes straw, such as rice straw, Wood powder made of soybean, corn, sorghum, sesame straw or peanut shell, twig waste, wood powder with a particle size of 100~700 mesh, water content equal to or less than 0.5%, filler: 5~15%, hair Foaming agent: 1~3%, auxiliary: 5~15%; The core material is divided into graphite pencil pen core material or color pencil pen core material, wherein graphite pencil pen core material includes graphite 55~80%, from 3B type lead The core begins to gradually increase a small amount of carbon melanin, polystyrene, polyethylene 15~50%, auxiliary 3~12%; color pencil pen core material includes high temperature resistant pigment 35~55%, polystyrene 18~40%, paraffin 10~20%, filler 12~30%, additive 3~10%; coating materials including high temperature resistant 2~20%, 80~ 98% polystyrene. More specifically, the raw materials used in the recycled wood pencil are divided into a pen bar material, a pen core material and a coated paint material. The weight characteristics of the three raw materials are: Pen material: Pen material: The paint material is 9:1 : 1; The pen material includes:

Recycled polystyrene and polypropylene or polystyrene and polyethylene: 40~70%; various types of lignocellulosic powder: 15~25% (The lignocellulosic powder includes straw or peanut shell, twig Rice scrap, its particle size is 100~700 mesh, water content is equal to or less than 0.5%); filler: 5~15%; foaming agent: 1~3%, auxiliary: 5~15%;

The pen core material is divided into graphite pencil pen core material or color pencil pen core material, wherein the graphite pencil pen core material includes 55 to 80% of graphite (from the 3B type lead core, the carbon black pigment is gradually increased); polystyrene and polyethylene 15 ~ 50%; Auxiliary 3~12%; Colored pencil pen core material including high temperature resistant pigment 35~55%; Polystyrene 18~40%; Paraffin 10~20%; Filling material 12~30%; Additive 3~ 10%;

The coating material includes 2~20% high temperature resistant pigment and 80~98% polystyrene. In one embodiment, depending on the hardness requirements of the pencil rod, the polystyrene and polypropylene are respectively used in the strip material, and the polystyrene and the polyethylene resin are used in combination, wherein polystyrene is used. The pen produced by polyethylene has toughness, but the resistance to curling is slightly larger, and the use of poly The styrene and polypropylene method produces a high hardness and is more convenient for coiling. The ratio of the above three resins is polystyrene: 25~40%, polyethylene or polypropylene: 15~30%, both of which are made of pen material. In a specific embodiment of the present invention, the lignocellulosic powder may be one or more of plant straw, peanut shell, and twig waste such as rice, wheat, soybean, corn, sorghum, and sesame. Mix the powder.

In a specific embodiment of the present invention, the graphite pencil core material comprises polystyrene and polyethylene, and the two resins are mainly different in proportion according to the blackness of the lead core produced and the fluency of writing. The polystyrene is 12 to 36%, and the polyethylene is 3 to 14%, both based on the total weight of the graphite pencil core.

In a specific embodiment of the present invention, in the production of the graphite pencil refills of the type 3B and above, in order to ensure that the blackness is up to standard and stable, the lead core of the 3B and above type is produced according to the lead blackness requirement. Different amounts of carbon melanin, the higher the blackness requirement, the greater the amount of carbon melanin added. According to the current actual production formula, when processing 3B~5B lead core, it will add 4B on the basis of 2B lead material formula. ～10% of the carbon melanin and the corresponding auxiliary agent, which is based on the total weight of the graphite pencil core.

(2) The production process and process of the recycled wood pencil are as follows:

1. The raw materials of the pen material, the pen core material and the coated paint material are uniformly mixed uniformly by the high speed mixer according to the ratio of the actual production products;

2. The granulating unit is used to separately granulate the mixed raw materials, wherein the pellet material reaches a particle size of less than 8 mm, and the core material and the coated granules reach a particle size of less than 5 mm;

3. The pellets are respectively put into a pen plastic extrusion molding machine, a refill plastic extrusion molding machine, and a plastic paint extrusion molding machine, wherein each plastic extrusion molding machine barrel is heated by a cast aluminum heater, plasticizing The temperature control in each stage of the process is 150 °C in the feeding section, 170 °C~18 in the middle section of the material (TC, 185 °C in the extrusion section; and the screw of each plastic extruder is made of high-strength nitrided alloy steel (38CrMoALA). And the compression ratio of up to 3.0 is the equidistant middle section of the root diameter gradient screw, wherein the rotation speed of the screw plastic extrusion molding machine screw is controlled at 20 to 100 rpm, the refill and the plastic coated extrusion machine screw The rotation speed is controlled at 10~70 rpm. The core material is extruded into the composite mold after being extruded by the refill plastic extrusion molding machine, and the extrusion port of the pen holder and the plastic paint extrusion molding machine is connected with the composite mold in turn, the pen holder The material and the coating material are respectively extruded into the composite mold after being extruded by the pen and the plastic paint extrusion molding machine, and the temperature of entering the composite mold is controlled to be below 16 CTC, and the above three semi-solid materials are formed into a shape by composite molding. Forming the sleeve; 4. The semi-solid pencil after shaping enters the vacuum shaping box under the action of the extruder and the tractor to complete the final cooling and setting;

5. After the cooling and shaping, the pencil is cut by the traction cutting machine according to the set length, and finally processed by the polishing machine, the trademark letter printer, the leather head machine and other downstream equipment. The features and benefits of the present invention are:

1. Replacing wood with plastic, saving wood, retaining green, and maintaining ecology;

2, the recycled wood pencil uses the same function and appearance as the solid wood pencil, its writing is smooth, the writing is easy to wipe, and it is easy to roll, in line with the public habits;

3. The recycled wood pencil is non-toxic and environmentally friendly. The scraps can be degraded by itself, and the scraps and scraps in the production process can be recycled. The whole production process is smoke-free, airless, tasteless, non-toxic, and does not produce any Pollution is a green product in the true sense;

4. Adopt one-shot molding technology, the process is simple, the quality is stable, and the production efficiency is high;

5. Compared with ordinary wooden pencils, the recycled wood pencil production line equipment is streamlined, which can save a lot of resources, less investment and quick market prospects;

6. Only need to adjust the ratio of raw materials to produce various types of pencils, such as 2H, HB, 2B, 3B and makeup pencils, and the finished shape can be customized according to requirements, such as round, hexagonal, triangular pens, etc. Flexible and easy to avoid repeated investment;

7. For the same type of products, the cost is lower than that of solid wood pencils, and all aspects of economic benefits are better than wooden lead pens. BEST MODE FOR CARRYING OUT THE INVENTION

The technical idea of the present invention is to:

By utilizing the plasticity of the plastic resin, under the deuteration of the foaming agent, the filling and separation of the fillers such as starch and talcum powder can be used to achieve the basic wooding effect, and at the same time, to further reduce the use of the wood with the finished product. The difference in feel, etc., I have added fine wood powder and special additives developed by myself, to produce "recycled wood" to replace the wood to make pencil pens.

At the same time, the heated plastic resin is used to glue and carry the powdery graphite, and then extruded by the extrusion, drawing and compounding mold, and organically combined with the semi-solid plastic woodized pen, and then colored by the composite mold. The finished pencils are produced in one time. The pencils produced by this process are constantly lead-free, non-slip-lead, and the functions of writing and cleaning are up to the quality standards and habits of wood pencils. The pencils produced by the above raw materials and processes do not contain toxic substances to the human body. Residues and scraps in the production process can be recycled. The whole production process is smoke-free, airless, tasteless, non-toxic and does not cause any pollution. It is a green product.

Each set of pencil production line equipment covers an area of about 48 square meters, and this process eliminates the cumbersome production process of traditional wood pencils such as slotting, gluing, loading lead, bonding, sanding, painting, etc. The investment in equipment and human resources has also greatly improved the production efficiency (calculated by the assembly line equipment with an annual output of 17 million pencils, the cost of wooden pencil equipment is about 2.7 million yuan, and the cost of the assembly line of wood-plastic pencils is only 500,000 yuan. Less than one-fifth of a wood pencil). The production line is relatively simple to construct and is a project that is easy to put into industrial production. The invention is further illustrated below in conjunction with specific embodiments. It is to be understood that the examples are not intended to limit the scope of the invention. The experimental methods in the following examples, which do not specify the specific conditions, are usually carried out according to conventional conditions or according to the conditions recommended by the manufacturer. Unless otherwise stated, all parts are in parts by mole and all percentages are by weight.

Example

In this case, the recycled wood pencil raw materials are divided into pen material, pen core material and coated paint according to the class. The pen material includes polystyrene, high density low pressure polyethylene, wood powder, talcum powder, starch and other fillers. And the corresponding additives, the weight ratio is: polystyrene 23%, high density low pressure polyethylene 25%, wood powder 20%, talcum powder, etc. 15%, foaming agent 2%, various types of mixing aids 15 The core material includes graphite, polystyrene, polyethylene, and zinc stearate. The weight ratio is: graphite 65%, polystyrene and polyethylene 30% (for example, polystyrene 24%, polyethylene) 6%), 5% zinc stearate additive; the coating material includes high temperature resistant pigment, polystyrene, and its weight ratio is: high temperature pigment 12%, polystyrene 88%.

The process and process of the regenerated wood pencil: Firstly, the raw materials of the pen material, the pen core material and the coating material are uniformly mixed uniformly by the high-speed mixer according to the above ratio scheme; and the mixed raw materials are separately manufactured by the granulating unit. Granule treatment, wherein the pellet material reaches a particle size of less than 8 mm, and the core material and the coated material pellets have a particle size of less than 5 mm; the pellets are respectively put into a pen plastic extrusion molding machine, a refill plastic extrusion molding machine, and a coating paint. Plasticizing in the plastic extrusion molding machine, wherein the temperature control in each stage of the plasticizing process is 150 ° C in the feeding section, 170 ° C to 18 in the middle section of the material (TC, 185 ° C in the extrusion section, and plastic extrusion of the pen holder The rotation speed of the forming machine screw is controlled at 80 rpm, and the rotation speed of the screw of the refill and the plastic extrusion molding machine is controlled at 20 rpm. The refill material is extruded through a refill plastic extrusion molding machine and then enters the composite mold. Inside, at the same time, the extrusion port of the pen and the plastic extrusion molding machine is connected to the composite mold in turn, the pen material and the coating The material is extruded into the composite mold by the pen and the plastic extrusion molding machine, and the temperature of the composite mold is controlled to be below 16 CTC. The three semi-solid materials are formed into a shaped mold sleeve after being composited by the composite mold; After the shaping, the semi-solid pencil enters the vacuum shaping box under the action of the extruder and the tractor to complete the final cooling and setting; after the cooling and shaping, the pencil is cut by the pulling and cutting machine according to the set length, and finally, the polishing machine, The trademark letter printer, the leather head machine and other downstream equipment are processed into finished products. in conclusion:

The reclaimed wood pencil according to the present invention is different from the plastic pencil on the market in that the plastic resin in the pen material formulation only serves to carry and bond wood powder, filler, etc., and not as a main material, and is produced by the formula. The pen is added to the wood powder and the corresponding coupling aid, and through the further effective control of the resin foam, it is the same as the wooden pencil in terms of appearance, grip, use habits and convenience of curling. , it can completely replace wooden pencils to meet the needs of the public.

In addition, the wood powder used in the pen material can be processed from various plant straws, peanut shells and branches, which is a process of waste recycling. It has fundamentally changed the traditional wood pencil processing technology that has been used for more than 300 years, saving a lot of high-quality wood, turning waste into treasure, reducing the damage of waste to the environment, and thus becoming a truly green product.

In addition, the present invention adopts a one-shot forming method, that is, using a plastic resin as a carrier and a bonded body, and adopting a pultrusion and setting process to produce a finished pencil at a time, which is superior to the conventional method of processing a pencil with a wooden board:

(1) The production process is small, which can greatly shorten the product production cycle and save labor input;

(2) Residues and scraps in the production process can be recycled and reused. The whole production process is smoke-free, airless, odorless, non-toxic, noise-free, and does not produce any pollution. It is a green environmental protection process in the true sense;

(3) Adopting one-time forming technology, the process is simple, the quality is stable, and the production efficiency is high;

(4) Compared with the processing of pencils for sheet metal, the equipment for reclaimed wood pencil production line is streamlined, which can save a lot of resources and reduce the investment;

(5) The shape of the finished pencil can be easily realized by changing the shape of the mold sleeve, such as round, hexagonal, triangular pen holder, etc., flexible and easy to avoid repeated investment.

Claims

Rights request

1. A recycled wood pencil, the recycled wood pencil and the raw materials used in the production process are divided into a pen bar material, a pen core material and a coating material according to the class, and the weight characteristic ratios of the three raw materials are: pen bar material: pen core material: The paint is 9

: 1 : 1;

The pen material includes: recycled polyethylene, polystyrene or polypropylene: 40~70%, wood powder:

15〜25%, the wood powder comprises a straw-like wood powder having a particle size of 100 to 700 mesh, a water content of equal to or less than 0.5%, a filler: 5 to 15%, a blowing agent: 1 to 3 %, auxiliary: 5~15%;

The pen core material is divided into graphite pencil pen core material or color pencil pen core material, wherein graphite pencil pen core material includes graphite 55%~80%, and gradually increases carbon melanin from 3B type lead core; polystyrene and polyethylene 15 ~50%, auxiliary 3~12%; color pencil pen core material includes high temperature resistant pigment 35~55%, polystyrene 18~40%, paraffin 10~20%, filler 12~30%, additive 3~ 10%;

The coating material includes 2~20% high temperature resistant pigment and 80~98% polystyrene.

The regenerated wood pencil according to claim 1, wherein the sheath material comprises: recycled polystyrene and polypropylene; or recycled polystyrene and polyethylene.

The regenerated wood pencil according to claim 2, wherein (a) recycled polystyrene: 25 to 40%, and (b) polyethylene or polypropylene: 15 to 30%; Total weight.

The regenerated wood pencil according to claim 1, wherein the wood powder in the pen material is made of rice straw, soybean, corn, sorghum, sesame straw or peanut shell, and twig waste. Powder.

The regenerated wood pencil according to claim 1, wherein the graphite pencil core material comprises: polystyrene 12 to 36%, polyethylene 3 to 14%, all of which are graphite pencil core materials. Total weight

The regenerated wood pencil according to claim 1, wherein the carbon black pigment is added in an amount of 4 to 10% based on the total weight of the graphite pencil core.

7. A process for producing a recycled wood pencil, characterized in that the raw material used in the recycled wood pencil is Claim 1 is indicated.

8. The manufacturing process according to claim 7, wherein

The raw materials of the pen material, the pen core material and the coating material are respectively uniformly mixed uniformly by the high speed mixer according to the ratio scheme of claim 1;

Then, the granulated unit is separately subjected to granulation treatment, wherein the pellet material reaches a particle size of less than 8 mm, and the core material and the coated granules reach a particle size of less than 5 mm;

The pellets are respectively put into a pen plastic extrusion molding machine, a refill plastic extrusion molding machine, a plastic paint extrusion molding machine, wherein each plastic extrusion molding machine barrel is heated by a cast aluminum heater, and each plasticizing process is performed. The control of the stage temperature is 150 ° C in the feeding section, 170 ° C to 180 ° C in the middle section, and 185 ° C in the extrusion section. In addition, the screw of each plastic extruder is made of high-strength nitrided alloy steel (38CrMoALA), and For the isometric middle section root diameter gradient screw with a compression ratio of 3.0, the rotation speed of the screw plastic extrusion molding machine screw is controlled at 20~100 rpm, and the rotation speed of the screw of the refill and the plastic extrusion molding machine is controlled. At 10~70 rpm; the core material is extruded into the composite mold after being extruded by a refill plastic extrusion molding machine, and the extrusion port of the pen holder and the plastic lacquer extrusion molding machine is sequentially connected with the composite mold, and the pen material and The coating materials are respectively extruded into the composite mold after being extruded by the pen and the plastic extrusion molding machine, and the temperature of entering the composite mold is controlled to be below 160 ° C. The above three semi-solid materials are formed into a shape by composite molding. Mold set Shape

The shaped semi-solid pencil enters the vacuum shaping box under the action of the extruder and the tractor to complete the final cooling and setting;

After the cooling and shaping is completed, the pencil is cut by the pulling and cutting machine according to the set length, and finally the regenerated wood pencil is processed by a post-processing device such as a polishing machine, a trademark letter printer, and a leather-loading machine.