Mould the co-extruding mould of wooden composite material
The present invention relates to new material technology field, relate in particular to a kind of co-extruding mould of moulding wooden composite material.
Plastics Packaging Wastes has seriously been polluted environment, has affected industrial and agricultural production, has endangered human health and vegeto-animal existence.World's plastics annual production has surpassed 200,000,000 tons, and China plastics packaging materials 2007 is 10 million ton, and these plastic package materials and container are after disposable use, and major part has become solid waste.Plastics Packaging Wastes is lightweight, volume is large, quantity is many, and hard degradation can not arbitrarily incinerate again, is mostly discarded in railway limit, inland waters and streets and lanes, cities and towns, " white pollution " band that accumulates over a long period and just become startling.According to relevant department, investigate 1000 tons, Shanghai daily output rubbish, plastic refuse accounts for 330 tons; 12000 tons, Beijing daily output rubbish, plastic refuse accounts for 360 tons; Approximately 6000 tons, Guangzhou daily output rubbish, plastic garbage accounts for 200 tons.
China's logging residue and producing material residue account for 40% of Tree biomass, and according to the Eleventh Five-Year Plan period forest harvesting limit of State Council approved, 2.5 hundred million m3/a calculate, and China is every year by the felling, the producing material residue that produce approximately 1.1 hundred million tons.In addition, industrial wood waste calculates and also has the annual production up to 3,210 ten thousand m3 by 34.4% of log.At present, although the utilization of forestry " three surplus things " has caused people's attention, worldwide development level is also uneven.The timber comprehensive utilization ratio of the developing countries such as China is only 50%～60%, and the timber comprehensive utilization ratio of developed country has reached 80%～90%.The development and utilization situation of forestry " three surplus things ": bulk density is low conventionally, volume is large in forestry " three surplus things ", and it is loose to distribute, be not easy to collect, storage and transportation, therefore traditional " three surplus things " processing mode greatly mainly with abandoning on the spot, the plain mode such as burning or landfill is main.At present, along with people improve gradually to the attention rate of air and water quality, these traditional methods cannot continue to continue to use.And by through engineering approaches and high performance, the modification regeneration of waste plastic and the making full use of of bamboo wood chip resource of wood (bamboo) plastic material, can solve the regeneration problem of waste or used plastics, bamboo wood working industry waste resource.
Wood plastic composite, first since western developed country is researched and developed successfully, has been widely used in skirting, wallboard, bed board, decorative panel, fence, balustrade, building template, building doors and windows, outdoor roof tiles; Automotive upholstery (door panel, base plate, standby wheel cover, backrest, instrument board, glove box, shadow shield, headrest plug-in unit etc.); Combination pallet, packing case, storage box, flower case, stock shelf for packing and logistics; Highway noises dividing plate, seashore road plate, railroad sleeper; Also can do Decorative frame, oceangoing ship ship passenger cabin dividing plate, office partition, outdoor outdoor table and bench, adjustable shelf etc., material just under development also has folded sheet, shutter, indoor roof plate, student desk and chair etc.This new technology is at the early-stage in China, along with going deep into of applying, will, to making full use of resource, increase economic efficiency and reduce the generation active influences such as environmental pollution, have wide market prospects.Wood plastic composite (WPC) is that to take the biological materials such as elementary wood, bamboo be primary raw material, a certain proportion of plastic matrix of compounding, the composite of machine-shaping after special process is processed.Wood plastic composite is applied widely, the use field that almost can contain all logs, plastics, plastic-steel, aluminium alloy and other similar composite, and because it uses environmental protection, cost economy, and can recycling, thereby have also solved the regeneration problem of composite, wood industry waste resource.Nowadays advocating under the overall situation of low-carbon economy, the recyclable feature of wood plastic composite more and more comes into one's own it.At present, global WPC output is over 2,000,000 tons.In the middle of this, north America region output ranks first with 1,000,000 tons, 300,000 tons, China, 70,000 tons, 100,000 tons, Japan and Germany.The wood plastic composite industry of visible China still develops reasonable in the world.
But also there is a certain distance with American-European, Japan and other countries in China's wood plastic composite, also in low and middle-grade times, the wood-plastic composite material products of particularly properties of product and service condition being had relatively high expectations is developed on a large scale, the advantage of himself does not also manifest comprehensively, such as wood plastic composite demand consumption, account for the high-end product market such as the U.S., South Africa of global consumption 80%, climatic environment is severe, to the adaptability of wood plastic composite, requires very high.Therefore, particularly formula and working process parameter have to be strengthened to the research of Wood plastic composite performance impact.Although the Wood plastic composite of domestic production has many good qualities, Shortcomings still so far, as easy scraping, easily the uniformity of poor, the color of greasy dirt, ageing resistance and persistence poor etc.These deficiencies need to be drawn external experience from further investigations of starting with such as composition and engineerings, and improve constantly production technology and the quality level of moulding wood products.
Summary of the invention:
Technical problem to be solved by this invention is to overcome the defect of prior art, a kind of co-extruding mould of moulding wooden composite material is further proposed, produce mould wooden co-extrusion product have higher intensity, hardness, acid and alkali-resistance, anticorrosive, indeformable, containing formaldehyde, the feature that easily reclaims.
Technical problem to be solved by this invention realizes by the following technical solutions.
A kind ofly mould wooden coextru-lamination new material, it is characterized in that: by core material and skin-material, formed, described core material is mainly mixed by wood, bamboo natural plant fibre and waste polyolefin plastics, described skin-material is mixed by modified plastics and look mother, and described skin-material is evenly coated on core material surface.
The mass ratio of described wood, bamboo natural plant fibre and waste polyolefin plastics is 2:1.
Described wood, bamboo natural plant fibre can be selected discarded wood, bamboo natural plant fibre, and wood, bamboo natural plant fibre and the shared ratio of waste polyolefin plastics are approximately 60%, 30%, also have 10% to be other inserts and additive.These materials are mixing under HTHP, form graininess sandwich layer semifinished material, these materials are under the high temperature of nearly 200 ℃, the effect of 20Mpa with upward pressure, well together mixing, low moisture, without bacterium, for the follow-up quality product that can produce is laid a solid foundation.Skin-material adopts improved polyalkene, has higher scraping and wiping resistance performance, good ageing resistace.Top layer and sandwich layer, in co-extruding mould, to be not less than the pressure of 15MPa, at the temperature of approximately 180 ℃, fuse together, and have very high laminating intensity, and ectonexine can not be separated from each other.
Described modified plastics is for adopting improved polyalkene.
A kind of co-extruding mould of moulding wooden composite material, it is characterized in that: comprise main extruder and auxiliary extruder, described main extruder is connected a co-extruding mould jointly with auxiliary extruder, the die cavity of described co-extruding mould comprises the main extruding cavity being connected with main extruder, also comprise the auxiliary extruding cavity being connected with auxiliary extruder, described auxiliary extruding cavity is by runner connection table layer material entrance, wall upper surface, chamber between described main extruding cavity and auxiliary extruding cavity is lower than flow path wall upper surface, skin-material can be crossed wall upper surface, chamber and enter main extruding cavity under extrusion pressure effect, be coated on core material outer surface.
The extrusion pressure of described auxiliary extruder is greater than the extrusion pressure of main extruder.
The extrusion pressure of described main extruder is 15-20MPa, and temperature is 180-300 ℃.
Beneficial effect of the present invention is:
Adopt discarded object as producing raw material, the product of preparation have higher intensity and hardness, acid and alkali-resistance, anticorrosive, indeformable, containing formaldehyde, the feature that easily reclaims, it is a kind of new green environment protection material, not enough, the easy scuffing of case hardness, easy-weathering, the surface that have solved the domestic existence of wood-plastic products in the market easily leave spot and are difficult to the defect of removing, uniformity and the persistence with stronger stability, ageing resistance, color, heat insulation, soundproof effect good, effectively improved the class of wood plastic composite.
The co-extruding mould of moulding wooden composite material provided by the invention, can produce dual plastic wood sheet, on common plastic wood sheet, wrap up one deck modified plastics, this co-extruding mould can connect two extruders simultaneously again, the disposable plastic wood sheet that processes parcel modified plastics.
Accompanying drawing explanation:
Fig. 1 is the connection diagram of main extruder and auxiliary extruder;
Fig. 2 is the structural representation of co-extruding mould of the present invention.
The specific embodiment:
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram and embodiment, further set forth the present invention.
As Fig. 1, shown in Fig. 2, a kind of co-extruding mould of moulding wooden composite material, comprise main extruder 2 and auxiliary extruder 1, main extruder 2 is connected a co-extruding mould 3 jointly with auxiliary extruder 1, the die cavity of co-extruding mould 3 comprises the main extruding cavity 35 being connected with main extruder 2, also comprise the auxiliary extruding cavity 34 being connected with auxiliary extruder 1, auxiliary extruding cavity 34 is by runner 32 connection table layer material entrances 31, chamber wall 33 upper surfaces between main extruding cavity 35 and auxiliary extruding cavity 34 are lower than flow path wall upper surface 36, skin-material can be crossed chamber wall 33 upper surfaces and enter main extruding cavity 35 under extrusion pressure effect, be coated on core material outer surface, core material joins in main extruder 2, by main extruder 2, be extruded into co-extruding mould 3, skin-material joins auxiliary extruder 1, by auxiliary extruder 1, be extruded into co-extruding mould 3, at co-extruding mould 3 endosexine materials, be coated on core material outer surface, wooden coextru-lamination new material is moulded in formation.
The place that co-extruding mould 3 inner sandwich layer materials and skin-material merge is main extruding cavity 35, guarantee that pressure when bi-material merges equates, flow velocity is identical.The method of realizing this goal is by gathering a large amount of experimental datas, sets up the functional relation between main extruder 2 and auxiliary extruder 1 main shaft, utilizes automatic control technology, ensures the Stability and dependability of producing.
During co-extruding mould 3 design, accomplish that the distance that skin-material flows through in runner is identical, on the normal plane of flow direction, long-pending the equating of section of melt, thereby realize in top layer and sandwich layer joint place, pressure is identical everywhere, flow velocity is identical, is guaranteeing that under the condition of certain pressure and temperature, top layer and sandwich layer bi-material can fit together more closely.
More than show and described basic principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and description, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.