CN109968596A - A kind of manufacturing method of environment protection paper-plastic composite pallet - Google Patents
A kind of manufacturing method of environment protection paper-plastic composite pallet Download PDFInfo
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- CN109968596A CN109968596A CN201910217856.7A CN201910217856A CN109968596A CN 109968596 A CN109968596 A CN 109968596A CN 201910217856 A CN201910217856 A CN 201910217856A CN 109968596 A CN109968596 A CN 109968596A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7178—Pallets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Pallets (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention discloses a kind of manufacturing method of environment protection paper-plastic composite pallet, comprising steps of the first step, granular PE composite wood-plastic material carried out heating fusing, the PE composite wood-plastic material of liquid is obtained；Second step, the PE composite wood-plastic material by liquid, directly overlay the outer surface of the paper pallet of preset shape and size, then cooling and shaping, paper-plastic stick pallet required for manufacture obtains.A kind of manufacturing method of environment protection paper-plastic composite pallet disclosed by the invention, it can make full use of rice straw, conveniently, paper-plastic stick pallet is reliably prepared, guarantee that paper-plastic stick pallet has good mechanical performance, and there is good dampproof effect, be conducive to widely apply, be of great practical significance.
Description
Technical field
The present invention relates to pallet manufacturing techniques fields, more particularly to a kind of manufacturing method of environment protection paper-plastic composite pallet.
Background technique
Pallet is the carrier of stack goods, and the small freight of dispersion can be formed to the list for being conducive to mechanized handling and carrying
Member, convenient for the packaging of cargo, stacking, carrying and transport.Therefore, pallet has become the indispensable important work of modern logistics systems
Tool.The material that pallet uses mainly has wooden, plastics, metal etc., and cargo or product often outdoor storage, substantially
Band pallet storing cargo is needed, since stock and turnover are too many, pallet has enough to meet the need not open.Existing frequently-used pallet has Wooden tray, modeling
Material torr disk, metal tray and paper pallet etc..
Wooden tray is current using most wide because its is cheap, solid, still, timber have be easy dampness it is mouldy,
The shortcomings that damaging by worms, can not cleaning, the in the world diffusion to prevent insect pest, it is desirable that Wooden tray will pass through at stifling and free from extraneous odour
Reason；The good integrity of plastic pallet, is easy to irrigation and disinfection at sanitary cleaning, still, causes price relatively expensive, but carries
Ability is smaller, is easy aging and deformation；Metal tray is durable, specification variation is easy, and is mainly used for holding pallet
Loading capacity requires relatively high occasion, the disadvantage is that sole mass is heavy, expensive, rust corrosion；Paper pallet is usually used
Corrugated board or cellular board manufacture, feature be it is light-weight, be not required to stifling and disinfect, inspection-free can export, not generate abandonment
Object, clean hygiene, the transport suitable for food and medicine trade use, still, after paper pallet makes moist or drenches with rain, intensity
It drastically reduces.
Currently, the great advantage of Wooden tray is that processing is convenient, low in cost, still, annual consumption timber reaches thousands of vertical
Square rice, this is a heavy burden to forest reserves shortage country as China.In the whole world, each state is all emphasized sustainable
Under the background of development, pallet production enterprise, which should continually develop, develops new material and pallet new product, greatly develops plastic pallet, gold
Belong to pallet and paper pallet etc., as far as possible reduction Wooden tray proportion in total ownership.Meanwhile in order to realize the fast of the world
Fast commodity inspection clearance and environmental requirement, customer requirement pallet production quotient produce relative intensity height, free from extraneous odour, it is low in cost, can be
The pallet that open air uses, improves transfer efficiency to the maximum extent.
Meanwhile China has a large amount of waste crop straws to need to handle, such as rice straw, corn stover, Wheat Straw
Stalk, reed straw etc., thus develop sponge, be one of the effective way solved the problems, such as, this to country and enterprise all
There are good prospect and profound significance.
Therefore, there is an urgent need to develop a kind of technologies out at present, can make full use of the wastes such as straw and rice husk, side
Just, wood plastics tray material is reliably prepared, the manufacture and use demand of pallet is met, is realized to wastes such as straw and rice husks
Resource recycling.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of manufacturing method of environment protection paper-plastic composite pallet, it can be abundant
Using rice straw, conveniently, paper-plastic stick pallet is reliably prepared, guarantees that paper-plastic stick pallet has good mechanical performance,
And there is good dampproof effect, be conducive to widely apply, be of great practical significance.
For this purpose, the present invention provides a kind of manufacturing methods of environment protection paper-plastic composite pallet, comprising the following steps:
Granular PE composite wood-plastic material is carried out heating fusing by the first step, obtains the PE composite wood-plastic material of liquid；
Second step, the PE composite wood-plastic material by liquid, directly overlay the appearance of the paper pallet of preset shape and size
Face, then cooling and shaping, manufacture obtain required paper-plastic stick pallet.
Wherein, in the first step, the preparation process of the granular PE composite wood-plastic material, comprising the following steps:
A), by plant fiber 90 DEG C~100 DEG C at a temperature of, it is dry to preset moisture content；
B), according to preset weight percent, by plant fiber, plastic resin, coupling agent, lubricant, light stabilizer and
Colorant is sufficiently mixed stirring, the mixture after being stirred；
C), by the mixture after stirring, it is put into progress extruding pelletization operation in extruding granulator, production obtains granular
PE composite wood-plastic material.
Wherein, in step a), the plant fiber is the bamboo powder that particle diameter is 0.15mm.
Wherein, in step a), the moisture content of the dry plant fiber to 2%~4%.
Wherein, in step b), by weight percent be 30%~36% bamboo powder, 60%~65% plastic resin,
2.0%~4.0% coupling agent, 0.7%~1.2% lubricant, 0.3%~0.4% light stabilizer and 0.01%~
0.03% colorant is sufficiently mixed stirring.
Wherein, the plastic resin is polyethylene；
The lubricant is polyethylene wax；
The coupling agent is silane coupling agent；
The colorant is toner.
Wherein, in second step, paper pallet is placed on inside preset shape and the mold of size in advance, then passes through note
Molding machine injects the PE composite wood-plastic material of liquid in mold, so that the PE composite wood-plastic material of liquid is under the effect of the pressure
Type chamber full of entire mold, then cooling and shaping again.
Wherein, in second step, the paper pallet includes bed board and Duo Gen stringer；
The bottom surface of the bed board and the top surface of stringer are bonded together.
Wherein, the bed board is adhesively-bonded together to form up and down by two layers of corrugated board；
By presetting, multi-wall corrugated board is stacked on top of one another to be adhesively-bonded together to form the stringer.
By the above technical solution provided by the invention as it can be seen that compared with prior art, the present invention provides a kind of environmental protection
The manufacturing method of paper-plastic stick pallet can make full use of rice straw, conveniently, reliably prepare paper-plastic stick pallet, protects
Demonstrate,proving paper-plastic stick pallet has good mechanical performance, and has good dampproof effect, is conducive to widely apply, have
Great production practices meaning.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the manufacturing method for environment protection paper-plastic composite pallet that the present invention improves.
Fig. 2 is the main production of the corrugated board used in a kind of environment protection paper-plastic composite pallet of the invention improved
Flow diagram.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawing with embodiment to this
Invention is described in further detail.
Referring to Fig. 1, the present invention provides a kind of manufacturing methods of environment protection paper-plastic composite pallet, the paper-plastic stick for environmental protection
Pallet.This method specifically includes the following steps:
Granular PE (polyethylene) composite wood-plastic material is carried out heating fusing by the first step, obtains PE (the poly- second of liquid
Alkene) composite wood-plastic material；
Second step, PE (polyethylene) composite wood-plastic material by liquid, directly overlay the paper support of preset shape and size
The outer surface of disk, then cooling and shaping, manufacture obtain required paper-plastic stick pallet.
In the present invention, in specific implementation, in the first step, granular PE (polyethylene) composite wood-plastic material
Preparation process, comprising the following steps:
A), by plant fiber 90 DEG C~100 DEG C at a temperature of, it is dry to preset moisture content；
B), according to preset weight percent, by plant fiber, plastic resin, coupling agent, lubricant, light stabilizer and
Colorant is sufficiently mixed stirring, the mixture after being stirred；
C), by the mixture after stirring, it is put into extruding granulator (also referred to as Squeezinggranulator) and carries out extruding pelletization behaviour
Make, production obtains granular PE (polyethylene) composite wood-plastic material.
In the present invention, in step a), the plant fiber, specifically particle diameter are the bamboo powder of 0.15mm.
In the present invention, in step a), the moisture content of the dry plant fiber to 2%~4%, preferably 2%.
It should be noted that plant fiber is made of cellulose, hemicellulose, lignin and various extraction objects, due to
The difference of content, leads to the difference of fiber mechanical property itself, and the present invention uses the preferable bamboo powder of mobility.When bamboo powder additional amount
When low, with the increase of bamboo powder additional amount, the bending strength and rigidity of material are all improved, but the mobility of material reduces, if
The weight percent that bamboo powder accounts for PE composite wood-plastic material total weight is more than 36%, will lead to bamboo powder fiber and largely gathers in the material
Collection forms special construction, and mobility is very poor；Lower than 30%, then the toughness of wood moulding and intensity are just insufficient.Therefore, the weight of fiber is controlled
Measure range are as follows: account for the 30%~36% of PE composite wood-plastic material total weight.Bamboo powder fiber has stronger water imbibition, needs to keep under strict control
Water content (i.e. moisture content) is controlled in 2%~16% (water content of raw material can suitably relax).In addition, bamboo powder particle diameter is
Composite material when 0.15mm, mechanical property are best.
It in the present invention, is 30%~36% bamboo powder, 60%~65% plastics by weight percent in step b)
Resin, 2.0%~4.0% coupling agent, 0.7%~1.2% lubricant, 0.3%~0.4% light stabilizer and
0.01%~0.03% colorant is sufficiently mixed stirring.
It should be noted that in step b) stirring can be sufficiently mixed by existing batch mixer, Lai Jinhang.Specifically
Mixing time can be 20 minutes, the stirring blade of batch mixer should be with barrel gap less than 0.5 centimetre, supplementary material mixed effect
It answers visual various particles and powder substantially uniform, without obvious agglomerate or gathers, generally require 40 minutes~1 hour time-consuming.
In the present invention, in step b), the plastic resin is preferred are as follows: polythene PE.
The lubricant is preferred are as follows: polyethylene wax (PE wax)；
The coupling agent is preferred are as follows: silane coupling agent；
The colorant is preferably toner.
In the present invention, in step c), extruding granulator (also referred to as Squeezinggranulator) can be existing single screw rod
Plastic granulator.
In specific implementation, the draw ratio (i.e. the ratio of spiro rod length and diameter) of the single screw rod plastic granulator is 32:1.
It should be noted that for the present invention, the single screw extrusion machine for being 32:1 by the material mixed merging draw ratio
Hopper in, the barrel temperature of extruder is 160 DEG C~180 DEG C, and screw speed is 5r/min~10r/min, using pelletizing side
Formula obtains the bamboo powder and the compound Wood-plastic material of PE plastic resin as plant fiber by screening.
It should be noted that the plastics in Wood-plastic material, are divided into thermosetting plastics and two kinds of thermoplastic, the present invention adopts
With the polyethylene (PE) among thermoplastic.If making wellability of the plant fiber in plastic solution good and distribution being equal
Even, this can improve the mechanical performance of Wood-plastic material.For plastic resin, if its weight for accounting for PE composite wood-plastic material total weight
Percentage is more than 65%, and the bamboo powder as plant fiber can be swum in the plastic resin liquid of fusing, and stability is poor, easily causes
Being unevenly distributed for bamboo powder is poor with stability, and the toughness and intensity of Wood-plastic material are insufficient；Bamboo powder is lower than in plastic resin weight content
When 60%, since liquid is very few, the mobility of Wood-plastic material is poor.Therefore, the additive amount of plastic resin, should control that account for PE multiple
Close the 60%~65% of Wood-plastic material total weight.
In the present invention, it is also necessary to which the compatibility of explanation, both materials of bamboo powder fiber and plastics is poor, bamboo powder tool
There is stronger water imbibition and polarity is very strong, and plastics have hydrophobicity and majority for nonpolarity, this results in two kinds of materials
Interfacial adhesion very little, needing to add various auxiliary agents appropriate improves the surface property of bamboo powder and plastics, to improve bamboo powder and modeling
The mechanical performance of interface binding power and composite material between material.
In the present invention, it should be noted that coupling agent can make to generate strong interface knot between plastics and fiber surface
It closes, drops low-fiber water imbibition, the compatibility and dispersibility of plant fiber and plastics are improved, to improve the machinery of Wood-plastic material
Performance.In the present invention, using silane coupling agent, when the weight percent that it accounts for PE composite wood-plastic material total weight is lower than
When 2.0%, the using effect of coupling agent is unobvious.As the content for increasing agent increases, the cohesive force of plastics and fiber can be improved, is changed
The dispersibility of kind fiber, reduces water imbibition；But when its weight percent for accounting for PE composite wood-plastic material total weight is more than 4.0%
When, the dispersion performance for improving fiber is decreased obviously, and is deteriorated with the caking property of plastics, there is the mutually exclusive reaction imagination.
Therefore, the additive amount of silane coupling agent preferably accounts for the 2.0%~4.0% of PE composite wood-plastic material total weight.
In the present invention, it should be noted that lubricant be improve melt mobility and extruded product surface quality,
Intermolecular friction in plastic resin can be reduced, improves melt fluidity, promote boundary lubrication between plastic resin and wood powder, is mentioned
High efficiency reduces edge abrasion, in the present invention, selects the high-purity PE wax of new PE material production.For lubricant, if
When its weight percent for accounting for PE composite wood-plastic material total weight is more than 1.2%, then, since the lubricant of low melting point is excessive,
The pallet product finally prepared can be made as temperature increases, and be easily deformed, the rigidity of pallet product is influenced；If it is multiple that it accounts for PE
The weight percent for closing Wood-plastic material total weight is lower than 0.7%, since content is very few, it is difficult to intermolecular phase mutual friction is reduced,
It cannot achieve the purpose for improving boundary lubrication between melt fluidity and resin and filler.Therefore, the additive amount of lubricant, should
Control accounts for the 0.7%~1.2% of PE composite wood-plastic material total weight.
In the present invention, it should be noted that stabilizer is divided into heat stabilizer and light stabilizer, wherein heat stabilizer master
Wanting function is thermal degradation when preventing processing, also prevents product aging in the long-term use, the use of pallet
The time limit and molding time are generally relatively short, therefore do not use heat stabilizer；Light stabilizer is to prevent plastics from absorbing UV energy
The Auto-oxidation reaction caused, caused degradation, light stabilizer be preferably account for PE composite wood-plastic material total weight 0.3%~
0.4%.
In specific implementation, the light stabilizer specifically using light stabilizer 622 (polybutadiene acid esters), can be Beijing
The light stabilizer 622 (polybutadiene acid esters) of Big Dipper auxiliary agent Co., Ltd production.Or can be light stabilizer JT-540, it fits
It can be the product of Changzhou Jia Tong Chemical Co., Ltd. for PE and PP plastics.
In the present invention, it should be noted that for the present invention, the toner used in wood plastics tray material have it is yellow, red,
Black, titanium dioxide etc., it can make the pallet of preparation have uniform and stable color, and it is slow to decolourize.
In the present invention, in specific implementation, in second step, paper pallet is placed on to the mould of preset shape and size in advance
Tool the inside is injected PE (polyethylene) composite wood-plastic material of liquid in mold, then by injection molding machine so that the PE of liquid
(polyethylene) composite wood-plastic material is full of the type chamber of entire mold under the effect of the pressure, then cooling and shaping again.
In the present invention, in specific implementation, in second step, the paper pallet includes that bed board 1 and Duo Gen stringer 2 are (unlimited
Yu Sangen)；
The bottom surface of the bed board 1 and the top surface of stringer 2 are bonded together.
In specific implementation, in second step, the bed board 1 is adhesively-bonded together to form up and down by two layers of corrugated board；
By presetting, multi-wall corrugated board is stacked on top of one another to be adhesively-bonded together to form the stringer 2.
It should be noted that paper pallet using the above structure, compressive property is preferable, and manufacture craft is simple, covering wood
Modeling is easy.
It should be noted that for the present invention, bed board is made of two layers of corrugated board bonding, plate with a thickness of 30mm, control
The water content of cardboard processed is between 9.5%~10%, and for the bending strength measured value of bed board between 342~355KPa, concora crush is strong
Measured value is spent between 265~300KPa.According to ISO 8611-2 " material transportation tray --- flat pallet --- second part
Can require and test selection " requirement of 2005-02-15 and national standard GB/T 4996-1996, the bending strength limit of pallet carries
Lotus is 2124.5kg.Illustrate that the pallet of this material and structure can carry 2 tons of cargo.
Therefore, paper-plastic stick pallet of the invention has good waterproof on the basis of keeping good mechanical properties
Property.Meanwhile low in cost, simple processing, shrinking percentage is small and uniform, and the pallet as environmental protection has with indoor use excellent outdoors
Gesture.
In specific implementation, the corrugated board is brown paper, for example, brown paper of 180 shells, paper with a thickness of 0.21mm,
Ring crush intensity is 1.35kN/m, ring crush index 7.52Nm/g, burst index 2.61Kpam2/g。
In specific implementation, the preparation process of the corrugated board is shown in Figure 2, comprising the following steps:
First sub-step, feedstock processing: it requires according to boiling and defibrination by rice straw dissection, and removes in raw material and be free of
Fiber or few fibrous impurity part, to improve the quality of paper pulp, the length of rice straw preferably 1.30~1.71mm it
Between.
Second sub-step, digesting technoloy: selection sulphite process carries out the raw material of dissection with rotary spherical digester (or vertical digester)
3.5 times of water of raw material (i.e. by the rice straw of the first sub-step processing) weight, sodium hydroxide is added in boiling in rotary spherical digester
Additional amount is the 11~13% of water weight, sodium sulphate additional amount is sodium hydroxide weight 12~15%；85 DEG C of alkali liquid temperature~
90℃；Rotary spherical digester idle running is after ten minutes, heat up 45 minutes, 0~0.45MPa of steam pressure, heat preservation 10~20 minutes, drain 20~30
Minute, steam discharge 10 minutes；It is required that residual alkali is 5~8g/L after boiling, rice straw paper pulp is finally prepared.That is, adopting
With sulphite process, production obtains rice straw paper pulp.
It should be noted that this method manufacture is sulfate pulp using sulphite process.Sulfate pulp is to adopt
It is digestant with sodium hydroxide and sodium sulphate mixed liquor.During the cooking process, because medical fluid effect is relatively gentler, fiber is not by strong
Strong erosion, therefore tough strong, made paper, folding, resistance to broken and tearing strength are fabulous.Of the invention does not float sulfate pulp
It can be used for manufacturing brown paper, sack kraft paper, kraft liner board and general wrapping paper and cardboard etc..
Third sub-step, washing and screening technique: being cellulose in view of the main component for constituting fiber in paper pulp, in addition also
The substances such as different degrees of hemicellulose, lignin, resin, pigment, pectin and ash content.Wherein, cellulose and hemicellulose are paper
The basis needed is starched, and other ingredients belong to the column removed.For this purpose, the thick slurry after boiling will enter washing and screening technique
Section, specifically: by washing and screening a part of miscellaneous rill removed in rice straw paper pulp, organic matter is to inorganic in raising slurry
The ratio of object reduces into slurry viscosity, reduces stiff degree；Also the epidermis film of raw material to be decomposed by being beaten, otherwise, epidermis rill
It is still sheet of to link together, it is not readily separated, increases the brittleness of paper；Strengthen selected, solution part, fibre bundle and non-fibre are not steamed in reduction
Dimension property impurity, guarantees the water filtering performance and fiber expansion of straw pulp, improves the dispersibility and flexibility of fiber, reduce returning for slurry
Huang etc..
In specific implementation, four sections of countercurrent washing regimes of horizontal belt can be used, adapted dilutes stirred tank between section, provides
The room and time of diffusion is mixed, to realize that fiber productivity is high, wash and starch completely.Slurry wash selects 30~40 purposes with net
Metal mesh and bed washer, and be equipped with high pressure water pipe and rinse wire side, it is ensured that fiber productivity reaches 80% or more, wash degree control
Between 9~13 mg/litres.
4th sub-step, beating process: there are mechanical mashing, ultrasonic wave beater hydrabeating method in view of mashing, this is
Mechanical and physical process, fiber, by the effect of shearing force, make the form of fiber and property all change in pulping process,
The mechanical strength, physical property and colloidal nature that paper pulp can be improved improve intensity, bursting strength, folding strength, the uniformity of paper
And stiffness etc., reduce surface roughness and loose porous property；By mashing regulation and control paper stock in online water filtering performance, with
The needs for adapting to paper machine production make paper obtain good forming, to improve the uniformity and intensity index of paper.
In specific implementation, in the paper technology of rice straw, using the light beating technique discongested and based on dispersing, mesh
Be improve fiber dispersibility and expansion.Specific beating process are as follows: rice straw paper pulp is ground through double plate first, is then led to
It crosses fluffer string to beat, last washed screening obtains refined stock, and in 36~38SR, humidity is 3.2~3.8g for beating degree control.
5th sub-step, copy paper technique: it is generally divided into using water in view of copy paper as the wet process of medium and using air as medium
Two methods of dry method.Wet papermaking process is mainly used at present, and wet papermaking includes fourdrinier, cylinder former and folder net papermaking
Three kinds of equipment.Copy paper technique mainly has squeezing, drying and press polish.
In specific implementation, copy paper technique is to make dewatering of pulp by squeezing first and consolidate paper web, improves smoothness and wet
Web strength reduces bulk, wet web is transmitted to dry position；And then be dried, the moisture in l Water Paper is removed, is improved
The intensity of paper increases the smoothness of paper, is completed at the same time the sizing of paper；Then press polish is carried out, application pressure is rolled by steam rod
Power and shearing force and steam, heating and wet paper fiber, keep it more flexible and are strengthened, improve the smoothness and light of paper
Damp degree improves the laterally uniform property of the parameters such as paper sheet thickness.
By the preparation process of the above corrugated board, brown paper produced is 180 grams of wood-free papers, is used as corrugated paper
Plate.
It should be noted that for the present invention, its advantage is that using rice straw as raw material, abundant raw material, at low cost, paper
The national standard of high-strength cow paper is fully achieved in quality, applies waste straw, while reducing crop straw burning and causing
Environmental pollution；In the whole process flow, boiling, washing and beating process link answer technology provided by strict implement
Condition carries out implementation.
Based on above technical scheme it is found that the pulping and papermaking process of rice straw by feedstock processing, boiling, washing and screening,
Mashing and copy paper composition, the technique of rice straw pulping and paper-making are straw after chaffcutter → dedusting → preimpregnation, into adding sodium hydroxide and
The rotary spherical digester of sodium sulphate carries out boiling, and the thick slurry after boiling enters washing → screening → purification, then passes through squeezing, dry and press polish
Copy paper is carried out, 150 grams of ox-hide paper is made.Compared with common paper technology, reduce bleaching and add filler technique.
If filler can reduce interfibrous combination, reduce the tensile strength, folding strength and bursting strength of paper.
For the present invention, by providing a kind of composite material that bamboo fibre is mixed with PE waste plastic and additive,
It is covered on paper pallet surface made of the corrugated board produced based on rice straw fiber, uses mechanical performance meeting
On the basis of, have the characteristics that simple processing, low in cost, moisture-proof, corrosion-resistant, appearance looks elegant, while can match colors as required, fits
With using outdoors.
It should be noted that rice straw paper produced is used for the present invention, to manufacture corrugated board, and
Paper pallet is further made using corrugated board；Then, by a certain percentage by bamboo fibre and waste plastic, appropriate help is added
Agent is stirred, and cooperates the Wood-plastic material of good fluidity out, final to make by the way that Wood-plastic material to be covered on to the surface of paper pallet
The paper-plastic stick pallet for producing environmental protection, meets the transport requirement of food and medicine trade.
Below by specific embodiment, to further illustrate the technical scheme of the present invention.
Embodiment.
In the present invention, manufacture Wood-plastic material by substrate of bamboo powder and PE plastic resin, specifically by weight at grouping
At as shown in table 1 below.
Table 1: composition ratio (by weight ratio: %) schematic table of Wood-plastic material.
| No | Fiber | Plastic resin | Coupling agent | Lubricant | Stabilizer | Colorant |
| 1 | 31.7 | 64.9 | 2.3 | 0.74 | 0.34 | 0.02 |
| 2 | 35.6 | 61.1 | 2.2 | 0.71 | 0.38 | 0.01 |
| 3 | 33.1 | 61.8 | 3.6 | 1.16 | 0.31 | 0.03 |
| 4 | 32.9 | 62.7 | 2.9 | 1.09 | 0.38 | 0.03 |
| 5 | 34.7 | 60.5 | 3.6 | 0.82 | 0.37 | 0.01 |
| 6 | 30.7 | 64.1 | 3.7 | 1.18 | 0.31 | 0.01 |
It should be noted that for the present invention, the injection molding process of paper-plastic stick pallet, specifically by Wood-plastic material
, on the surface that the paper pallet in mold is directly overlayed by injection molding machine, Wood-plastic material is heated, pressurizeed and is melted by machinery
Change, so that the wood moulding solution of liquid is full of the type chamber of entire mold under pressure, finally carry out cooling and shaping.
In injection molding process, if injection temperature is too low, Wood-plastic material fusing is insufficient and head pressure is excessive, liquid
Body poor fluidity and Wood-plastic material in machine barrel and mold squeeze out difficult；Temperature is excessively high, and Wood-plastic material is easy to happen degradation, is easy
Burning, and head pressure cannot reach defined standard, cause the material squeezed out that cannot be full of type chamber.For this purpose, injection molding machine adds
The control of section temperature is expected at 170~175 DEG C, and compression section and homogenizing zone control are between 170 DEG C~190 DEG C, head and injection hole control
System is at 170 DEG C~175 DEG C.
In injection molding process, if the extrusion pressure deficiency of injection molding machine will cause, product surface is coarse, intensity is low；Compared with
High extrusion pressure keeps the inside and outside differential pressure of machine head port mould big, is unfavorable for obtaining uniformly fine and closely woven structure.General screw speed is 12
Between~18r/min, keep projecting pressure between 200~230MPa.
Compared with prior art, the environment protection paper-plastic composite pallet prepared by the present invention, with Advantageous below
Effect:
1, facilitate the protection of the forest reserves, without fumigation and mould proof and peculiar smell erosion processing；
2, sanitation and hygiene, free from insect pests meet European & American Market requirement, and the industries such as food and medicine can be used directly；
3, shape is flat and smooth, and there is no clast and iron nails etc., can largely protect the packaging of carrier；
4, have the function of moisture-proof and waterproof and rainwater-proof leaching etc., it can be in outdoor use；
5, sturdy and durable, cheap, convenient for handling, inspection-free clearance is convenient, and cost is saved in transport；
6, for paper pallet compared with Wooden tray, weight is 3~5 times light under same weight, and 100% is recyclable.
In conclusion compared with prior art, a kind of manufacturing method of environment protection paper-plastic composite pallet provided by the invention,
It can make full use of rice straw, conveniently, reliably prepare paper-plastic stick pallet, and it is good to guarantee that paper-plastic stick pallet has
Mechanical performance, and there is good dampproof effect, be conducive to widely apply, be of great practical significance.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (9)
1. a kind of manufacturing method of environment protection paper-plastic composite pallet, which comprises the following steps:
Granular PE composite wood-plastic material is carried out heating fusing by the first step, obtains the PE composite wood-plastic material of liquid；
Second step, the PE composite wood-plastic material by liquid, directly overlay the outer surface of the paper pallet of preset shape and size, so
Cooling and shaping afterwards, paper-plastic stick pallet required for manufacture obtains.
2. manufacturing method as described in claim 1, which is characterized in that in the first step, the granular PE composite wood-plastic
The preparation process of material, comprising the following steps:
A), by plant fiber 90 DEG C~100 DEG C at a temperature of, it is dry to preset moisture content；
B), according to preset weight percent, by plant fiber, plastic resin, coupling agent, lubricant, light stabilizer and coloring
Agent is sufficiently mixed stirring, the mixture after being stirred；
C), by the mixture after stirring, it is put into progress extruding pelletization operation in extruding granulator, it is multiple that production obtains granular PE
Close Wood-plastic material.
3. manufacturing method as claimed in claim 2, which is characterized in that in step a), the plant fiber is particle diameter
For the bamboo powder of 0.15mm.
4. manufacturing method as claimed in claim 2, which is characterized in that in step a), dry the aqueous of the plant fiber
Rate is to 2%~4%.
5. manufacturing method as claimed in claim 2, which is characterized in that in step b), by weight percent be 30%~
36% bamboo powder, 60%~65% plastic resin, 2.0%~4.0% coupling agent, 0.7%~1.2% lubricant,
0.3%~0.4% light stabilizer and 0.01%~0.03% colorant, be sufficiently mixed stirring.
6. manufacturing method as claimed in claim 5, which is characterized in that the plastic resin is polyethylene；
The lubricant is polyethylene wax；
The coupling agent is silane coupling agent；
The colorant is toner.
7. manufacturing method as described in claim 1, which is characterized in that in second step, be in advance placed on paper pallet default
Inside the mold of shapes and sizes, then by injection molding machine, the PE composite wood-plastic material of liquid is injected in mold, so that liquid
PE composite wood-plastic material be full of the type chamber of entire mold under the effect of the pressure, then cooling and shaping again.
8. the manufacturing method as described in any one of claims 1 to 7, which is characterized in that in second step, the paper pallet packet
Include bed board (1) He Duogen stringer (2)；
The bottom surface of the bed board 1 and the top surface of stringer (2) are bonded together.
9. manufacturing method as claimed in claim 8, which is characterized in that the bed board (1) is viscous up and down by two layers of corrugated board
It is combined to be formed；
By presetting, multi-wall corrugated board is stacked on top of one another to be adhesively-bonded together to form the stringer (2).
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