Background technology
Existing utilization ejection formed piece technology, its primary raw material source is thermoset plastic, thermoplastic shape at present in the whole world
Material or heat curing-type rubber, but plastics or rubber are difficult to be decomposed by the microorganisms, rot in natural environment or landfill,
A large amount of dense smokes and toxic gas can be produced again in burning incineration course, the various environmental pollutions such as air, soil, water source are caused,
And turn into environment environmental issue.
Additionally, the manufacture method of existing thermoplastic plastic ejection formed piece, all needs to utilize high temperature in batch mixing with when projecting
Plastics are made to maintain molten condition, so as in injecting die cavity, plastics gradually obtain ejection formed piece after cooling and shaping in the die cavity,
In order that plastics can be melted completely, project expects pipe and want continuous heating and to be maintained at more than 200 DEG C of high temperature, in die cavity, then
Must wait until that ejection formed piece is shaped and is cooled to below predetermined temperature completely could take out, in order to avoid ejection formed piece softening transform,
Make the manufacturing time of ejection formed piece long, therefore, existing thermoplastic ejection formed piece have material not environmentally, waste energy
The shortcomings of source, low manufacture efficiency, high cost;Same thermoset plastic and heat curing-type rubber ejection formed piece also have material not ring
The shortcomings of protecting, waste the energy, low manufacture efficiency, high cost.
In order to solve the problems, such as material not environmentally, although also have part daily living article with timber or paper pulp as raw material,
But existing timber and the wet type manufacture method of paper pulp, in addition to it must still cut down forest, can also discharge a large amount of papermaking wastewaters, to environment
Still can heavy damage, and cost cannot also reduce.
In addition, in order in response to ecological requirements, also there is the product with string as raw material in recent years, but such product system
Makes be that the major defect of hot-press molding method is not easy uniformly to cause product thickness not for pan feeding based on hot pressing mode shaping
Make deformation rate high and the product of special construction and shape cannot be molded, such as to manufacture special shape product must it is secondary or
Repeatedly processing, and have the low shortcoming of high cost, process efficiency, even with the product that the method for ejection formation is obtained
Be easily cracked, the rough or phenomenon that there is bubble to produce, and need secondary operation to increase cost, reduce efficiency.
In view of this, at present except still needing to be devoted to original of the various natural agricultural wastes of exploitation as various life products
Material is stressed outside environmental protection with saving cost of material, in order to further lift Related product quality, increase shape of product diversification and change
Kind manufacture efficiency, still has Persisting exploitation and improves the demand of manufacture method, and meet the national policy of environmental protection.
The content of the invention
The present invention makes the string of its manufacture when plant fiber injection molded product is manufactured by the way of rapid heat cycle
Ejection formed piece surface is smooth, no cracking and bubble, reduces the cost of secondary operation.
The invention provides a kind of manufacture method of plant fiber injection molded product, the manufacture method includes following step
Suddenly:
1. dispensing:String, glue, additive are mixed, string batch mixing is obtained;
2. ejection formation:Mould is first warming up to 110~160 DEG C using rapid heat cycle gloss mold temperature controller high in 30s, then will
String batch mixing is injected in the die cavity of mould using 15~350MPa pressure, 15~350MPa, 3~5min of pressurize, then by mould
Tool is cooled to 50~80 DEG C, 15~350MPa, 3~5min of pressurize, finally by mould using rapid heat cycle gloss mold temperature controller high in 30s
Tool is cooled to -10~30 DEG C again using rapid heat cycle gloss mold temperature controller high in 30s, is dropped after 15~350MPa pressurizes, 3~5min
10~15MPa, 2~5min of pressurize are depressed into, plant fiber injection molded product is obtained.
The device of present invention manufacture plant fiber injection molded product preferably comprises storage vat, binder cylinder, cooler, material
Manage, penetrate head, mould, rapid heat cycle gloss mold temperature controller high, evacuator, the discharging opening of the storage vat connects with the charging aperture of binder cylinder
Connect, the binder cylinder is connected with cooler, the binder cylinder is provided with for material to be pressed into strip and the screw rod of expects pipe is squeezed into, institute
State the discharging opening of binder cylinder to be connected with the feeding mouth of expects pipe, the discharging opening of the expects pipe is connected with head is penetrated, described to penetrate head and mould
Connection, the mould is connected with rapid heat cycle gloss mold temperature controller high, and the mould is connected with evacuator.
Mould of the present invention is more preferably that, with TOP-TIP, the hot nozzle of mould is provided with several envelope pins, often
Individual hot nozzle is provided with independent air flue, and feed time and the charging of each hot nozzle are individually controlled by magnetic valve and the time relay
Amount.
Rapid heat cycle gloss mold temperature controller high of the present invention is more preferably have heating, cooling, cold and hot conversion and control work(
Liquid, cooling liquid recovery system and can be heated, the heating liquid and cooling liquid are preferably silicone oil or water.
String of the present invention is preferably husk fiber, stalk fibrid, waste residue fiber and starch fiber
In at least one.
Husk fiber of the present invention is preferably in rice husk, wheat husk, sorghum husk, peanut shell, beanpod and cocoanut shell extremely
Few one kind.
Stalk fibrid of the present invention is preferably in rice straw, straw, cornstalk, sorghum stalk, beans stalk, cotton stalk and reed
It is at least one.
Waste residue fiber of the present invention is preferably wood chip, bamboo scraps, corn ear slag, bagasse, soybean residue, beer residue and beans
At least one in slag.
Starch fiber of the present invention is preferably cornstarch, dehydrated potato powder, tapioca starch, soy meal, bajiao banana powder, taro powder
With at least one in acorn nut powder.
String of the present invention belongs to agricultural wastes, cheap and easily-available, and species extensively, can be according to various regions resource situation
And season, different raw materials being chosen, can be decomposed in natural environment using the product manufactured by string of the present invention, accord with
Cyclization guaranteed request.
The granularity of string of the present invention is preferably 40~120 mesh.
When the granularity of string of the present invention is more than 120 mesh, cause string mobility in glue poor, easily
Agglomeration is produced, although the product surface of manufacture is more smooth, structural strength is deteriorated with physical property;String of the present invention
Granularity be less than 40 mesh when, then need to take more time to be processed with program, increase manufacturing cost.
Glue of the present invention is preferably latex, pectin, protein adhesive, melamine glue, phenolic resin glue and Lauxite
At least one in glue.
Additive of the present invention is preferably the mixture of cornstarch, sulfate and stearic acid.
Sulfate of the present invention is preferably barium sulfate, ferric sulfate, zinc sulfate, manganese sulfate or chromium sulfate.
Stearic acid of the present invention is preferably hard magnesium, calcium stearate, zinc stearate, stearic acid aluminium or stearic acid
Barium.
Additive of the present invention, preferably by mass percentage, is made up of following components:
Cornstarch 40~60%
Sulfate 20~40%
Stearic acid 10~30%.
String batch mixing of the present invention, preferably by mass percentage, is made up of following components:
String 45~70%
Glue 10~35%
Additive 15~25%.
The moisture content of string batch mixing of the present invention is preferably 30~50wt%.
Temperature of the string batch mixing of the present invention before die cavity is injected is preferably not higher than 58 DEG C, specifically from dispensing
Control temperature to be not higher than 58 DEG C to before injecting die cavity, make string batch mixing avoid the moisture that frictional heat is caused from reducing and shift to an earlier date
Produce chemical reaction.
String batch mixing of the present invention is preferably while die cavity is injected and die cavity is vacuumized, and mixes string
Expect uniformly to fill up die cavity, accelerate to exclude hot gas moisture, improve shaping speed, stabilized product quality and reduction fraction defective.
Mould intracavity wall of the present invention is preferably and is provided with aluminium alloy, is conducive to the rapid temperature rise and drop to string batch mixing.
The purpose of another aspect of the present invention is that the string that the manufacture method described in offer the invention described above is obtained is penetrated
Go out products formed.
The purpose of another aspect of the invention be provide the invention described above described in plant fiber injection molded product in funeral and interment
Application in articles for use, furniture or building materials.
The present invention has the beneficial effect that:
1. the present invention is manufactured by rapid heat cycle mode plant fiber injection molded product surface is smooth, cracking rate is low, nothing
Bubble produces, reduces the cost of secondary operation, specially cracking rate 0.02%, bubble formation rate 0%;And plant of the prior art
Fibres ejection formed piece is because without being manufactured using rapid heat cycle mode, cracking rate is 20%, and bubble formation rate is
5%;The hot-forming product cracking rate of string of the prior art is 30%, and bubble formation rate is 10%;
2. plant fiber injection molded product density produced by the present invention is big, water absorption is low, the function with waterproof.
Brief description of the drawings
The width of accompanying drawing of the present invention 9,
Fig. 1 is the structural representation of the vertical ejection forming machine with rapid heat cycle function;
Fig. 2 is the structural representation of the Horizontal Projecting Make-up Machine with rapid heat cycle function;
Wherein, 1, storage vat, 2, binder cylinder, 21, screw rod, 3, cooler, 4, project bar, 5, expects pipe, 6, penetrate head, 7, mould
Tool, 71, die cavity, 72, die wall, 8, rapid heat cycle gloss mold temperature controller high, 9, evacuator.
Fig. 3 is the smooth design sketch without cracking bubble-free string cinerary casket in surface of the manufacture of the embodiment of the present invention 1;
Fig. 4 is the design sketch of the string cinerary casket cracking of prior art manufacture;
Fig. 5 is the amplification effect figure of the string cinerary casket cracking of prior art manufacture;
Fig. 6 is the design sketch that the string cinerary casket that prior art is manufactured has arc bubble;
Fig. 7 is the amplification effect figure that the string cinerary casket that prior art is manufactured has arc bubble;
Fig. 8 is the design sketch that the string cinerary casket that prior art is manufactured has non-arc bubble;
Fig. 9 is the amplification effect figure that the string cinerary casket that prior art is manufactured has non-arc bubble.