CN105216255A - A kind of thermoplastic thin-walled melt direct compression-moulding methods continuously - Google Patents
A kind of thermoplastic thin-walled melt direct compression-moulding methods continuously Download PDFInfo
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- CN105216255A CN105216255A CN201510675674.6A CN201510675674A CN105216255A CN 105216255 A CN105216255 A CN 105216255A CN 201510675674 A CN201510675674 A CN 201510675674A CN 105216255 A CN105216255 A CN 105216255A
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0011—Combinations of extrusion moulding with other shaping operations combined with compression moulding
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Abstract
A kind of thermoplastic thin-walled melt direct compression-moulding methods continuously, comprise the following steps of carrying out that uninterruptedly circulate continuously: a., by the components by weight percent of thermoplastic 50%, wood powder 15%, inserts 15%, Heat Conduction Material 10%, auxiliary agent 10%, puts into high-speed mixer and makes compound; B. the compound in step a is put into comminutor and makes particle; C. the particle in step b is rendered to plate-extruding machine and form melt through heat transfer and shearing; D. the melt in step c is formed melt plate embryo through board mould; E. the mould of melting slab on pressure apparatus in steps d is pressed into sheet embryo; F. the goods slab in step e is cut rear separation by the traction of sheet material hauling machine to guillotine, obtain finished product.Present invention achieves the direct compression molding of uninterrupted circulation continuously in the molten state of thin-walled wide cut melt, product surface hardness is high, size is accurate, shape is full, corner angle are clearly demarcated, and the technological process of production is simple, and with short production cycle, production efficiency is high.
Description
Technical field
The present invention relates to a kind of method of plastics processing, the method for the continuous directly compression molding of a kind of thermoplastic thin-walled melt is specifically provided.
Background technology
Thin wall plastic products is widely used in the field such as packaging, decoration, lamp decoration, advertisement, container, covers the various aspects of our life, work, household.Thin wall plastic products is the same with traditional plastic products, with regard to the raw material that it uses, can be divided into thin-wall thermoplastic plastic products and thin-walled thermoset plastic articles.But; the processing of thin wall plastic products is by the impact of material, equipment, technique; be not the production that the existing plastic processing mode of production is all applicable to thin wall plastic products; can realize the processing mode of thin wall plastic products production at present; just have injection moulding, blow molding, plastics sucking moulding, the several method such as compressing; but above several processing modes all exist significant limitation in the production realizing thin wall plastic products, below we analyze one by one.
Injection moulding is also known as injection-molded shaping, and it is a kind of forming method injecting double molding.Injection moulding refers to that plastic raw materials becomes melt through heating and shear melting, under the pressure effect of injector, plastic melt to be injected in die cavity and to be full of whole die cavity, then with the heat exchange of mould, plastic melt cooling and shaping being obtained the goods the same with designs of mold cavities by plastic melt.Injection moulding is almost applicable to all thermoplastics.Injection moulding is also successfully used to some thermosetting plastics shaping.The method is applicable to the batch production of complex-shaped parts, injection molding molding cycle short (several seconds to a few minutes), shaped article quality can by several grams to tens kilograms, can one-shot forming complex contour, size accurately, with the plastic products of metal or non-metallic insert, injection moulding process operation also can realize automation.Therefore, the method strong adaptability, production efficiency is high.It is one of important processing mode of plastic products processing.
But, production injection moulding for thin wall plastic products just has significant limitation, from injection molding operation principle, we know, the plastic melt of melting is filled to each part of die cavity through die cavity from cast gate, wall thickness as fruit product is very thin, namely the gap of die cavity is very little, because the reason of resistance and cooling, then plastic melt is difficult to arrive and be full of whole die cavity, the mobility of plastic melt itself is bad simultaneously, also can produce very large resistance to be also difficult to arrive and be full of die cavity, also can cause that plastic melt is overheated occurs grog phenomenon, therefore, injection moulding is only very good in the mobility of plastic material itself, stability is very good, and the production of not too thin wall plastic products when mold heated, could be realized.
Blowing processing also claims hollow blow molding, is that one develops plastic working method rapidly.Refer to that thermoplastic raw material becomes melt through heating and shear melting, through the melt pipe that pipe embryo mould molding is tubulose, melt pipe embryo is placed in split cavity, in melt pipe embryo, compressed air is passed into immediately after mold closing, make melt pipe embryo inflation and be close on mould inner wall, through cooling and demolding, namely obtain various hollow product.Blow molding technology was widely applied and developed in recent years, and the volume of hollow container can reach thousands of liter, and some production have employed computer and controlled.The plastics being applicable to blowing have polyethylene, polyvinyl chloride, polypropylene, polyester etc.Compared with injection moulding, blowing process equipment cost is lower, and adaptability is comparatively strong, the goods of good, the thin-wall complicated shape of plastic performance.
Although blowing processing can the goods of processing thermoplastic plastic thin wall complicated shape, but goods are only limitted to close-shaped container class goods, the shaping of non-close opening goods cannot be carried out, and mould only has die not have punch, lean against to pass into compressed air in closed melt pipe embryo and make melt pipe embryo inflation and be close on die inwall shaping, the principle of compressed air due to mineralization pressure and the compressibility reason of air dielectric, enough large briquetting pressure cannot be formed, therefore the goods of complicated shape cannot form corner angle clearly at the transition position of change in size and change in shape, also the large drawing and forming of change in size cannot be carried out, therefore, also there is significant limitation in the production blowing processing for thin wall plastic products.
Plastics sucking moulding is a kind of shaping method of plastic vacuum, it is that thermoplastic plate or sheet material are fixed along the non-cavity section of die periphery, then by the method for radiation heating, sheet material or sheet material are heated, after sheet material and sheet material are heated to plastics softening temperature, plastic plate or sheet material are blown in the center of mold cavity, make it the depression forming a hollow in mold cavity, air between sheet material and mould is taken out by the method vacuumized with vavuum pump again, negative pressure by vavuum pump makes sheet material or sheet material be close to cooling forming on mould, finally by being blown into compressed air or ejecting mechanism makes thin-gage goods plate embryo deviate from from mould cavity, again through cutting the goods obtaining thin wall profile.
The processing of complicated shape is inherently carried out in plastic uptake processing to thermoplastic thin sheet and sheet material, but it is the same with blowing processing, mould only has die not have punch, lean against closed plastics to soften plate embryo or between sheet material and die cavity, pump plastics with vavuum pump and soften plate embryo or the air between sheet material and die cavity, negative pressure makes sheet material or sheet material be close to cooling forming on mould, the principle of negative pressure of vacuum due to mineralization pressure and the dilutable reason of air dielectric, enough large shaping negative pressure cannot be formed, therefore plastics soften plate embryo or sheet material cannot form complicated shape clearly at the transition position of change in size and change in shape.Therefore, plastic uptake processing is difficult to the moulding processing realizing thin wall plastic products.
Compressing is plastics, filling, chip or fiber prepreg material etc. are mixed according to formula rate, then compound is placed in cavity impression according to the weight of setting, close formpiston, by pressure and heat effect, compound is melted and is full of die cavity, after pressurize after a predetermined time, it is made to solidify, the goods that after cooling, demoulding formation is identical with die cavity.Compressing technique is applicable to thermosetting plastics, as phenolic aldehyde, urea aldehyde, epoxy plastics, unsaturated polyester (UP), aminoplast, polyimides, organosilicon etc., and the processing of some thermoplastic articles.The major advantage of compressing technique has that product size precision is high, any surface finish, without the need to secondary modification etc., can the baroque goods of one-shot forming.Compressing weak point is that Making mold is complicated, and investment is comparatively large, and the production and processing time is long, and efficiency is low, and the machine that is stressed in addition limits, and compressing processing is suitable for producing middle-size and small-size composite product in batches.
For the goods of thin-wall complicated shape, compressing processing is limited by very large.First, the material that compressing processing uses is mostly thermosetting plastics, and thermoset plastic articles is hard and crisp, lacking toughness, and especially thin-wall construction design, fracture has just appearred in slight collision.Secondly, in compressing process, plastic mixture does not almost have the flowing of melting in die cavity, and the narrow and small die cavity of thin-walled often cannot be full of, cannot the shape of shaping complexity.
Summary of the invention
For solving the problem, the invention provides a kind of thermoplastic thin-walled melt direct compression-moulding methods continuously, the composite that the material that the present invention adopts is made up of thermoplastic, wood powder, inserts, Heat Conduction Material and auxiliary agent etc., this composite is through plate-extruding machine heat transfer and shear formation melt, melt forms the melt plate embryo of thin-walled wide cut through rack-style board mould, then by pressure apparatus compression molding on the basis of the melt plate embryo of thin-walled wide cut.Compared with injection moulding, this composite forms the melt plate embryo of thin-walled wide cut, be filled to each part of die cavity through the die cavity of thin-walled from cast gate than the melt of this composite, much easier, that is this new machining method is lower than injection moulding to the mobility of material, stability, make composite achieve application in thin-walled wide cut complicated shape goods, the application of composite will reduce the cost of thin-walled wide cut goods greatly.
For achieving the above object, the technical solution used in the present invention is: a kind of thermoplastic thin-walled melt is direct compression-moulding methods continuously, comprises the following steps of carrying out that uninterruptedly circulate continuously:
A. by the components by weight percent of thermoplastic 50%, wood powder 15%, inserts 15%, Heat Conduction Material 10%, auxiliary agent 10%, put into high-speed mixer and make compound;
B. the compound in step a is put into comminutor and makes particle;
C. the particle in step b is rendered to plate-extruding machine and form melt through heat transfer and shearing;
D. the melt in step c is formed melt plate embryo through board mould;
E. the mould of melting slab on pressure apparatus in steps d is pressed into sheet embryo;
F. the goods slab in step e is cut rear separation by the traction of sheet material hauling machine to guillotine, obtain finished product.
Containing CBA in the material prescription of described new machining method, heat and shearing force effect under, CBA can discharge a large amount of gas, gas defines many small closed pore bubbles because of the elasticity of melt, it is the netted structure of honeycomb that the bubble of these closed pores forms face of resolving, and obtains the light material that density is little, good rigidly, intensity are large.
Described new machining method be thin-walled melt plate embryo in the molten state, shaping by the effect of pressure apparatus pressure, add that closed pore bubble outwards expands to liquidate with pressure apparatus pressure direction, plate embryo will be full of the die cavity of mould under the effect of dual-pressure, and complete rapidly shaping and cooling procedure, bubble is enclosed in melt, obtains that case hardness is high, size is accurate, shape is full, sharp-featured goods.
The thin-walled melt plate embryo of described new machining method covers whole die cavities of mould in the mode of flat board, time shaping, melt plate embryo only does the correction of flowing among a small circle and shape, both the shape and size needed for goods had been obtained, the technological process of production is simple, thin-walled melt plate embryo is in molten condition simultaneously, the draw ratio of the melt under molten condition is comparatively large, again can the goods of shaping complicated shape.
Described new machining method is that material is shaped to thin-walled melt plate embryo by board mould under the shearing plastication of plate-extruding machine, by the mould straight forming of the state of cooling in pressure apparatus; the short time can complete transfer of heat after thin-walled melt plate embryo forming; make the quick cooling and shaping of goods get off; the production cycle is very short, and production efficiency is high.
New machining method be thin-walled melt plate embryo in the molten state, directly act on the punch of molding die by the pressure of pressure apparatus and die shaping; thin-walled melting plate embryo will bear huge pressure; add closed pore bubble and outwards expand and to liquidate with pressure apparatus pressure direction; thin-walled melt plate embryo will be full of the die cavity of mould under the effect of dual-pressure, and complete rapidly shaping and cooling procedure.This from blow molding, plastics sucking moulding is different, the briquetting pressure of new machining method, act directly on the hydraulic coupling on molding die punch and die, it is rigid pressure, and blow molding, plastics sucking moulding processing only have former, not having formpiston, is pneumatically and vacuum adsorption molding, is pliable pressure.New machining method is easier to obtain that case hardness is high, size is accurate, shape is full, sharp-featured goods.
The material of the use of new machining method obtains enough plasticizings through extruder heat transfer and shearing and forms melt, the viscosity of melt is less, be easy to flowing and stretch, and cover on mold cavity in the mode of thin-walled flat board, time shaping, melt only does the correction of flowing among a small circle and shape, impose again in the little pressure short time and complete shaping process, the technological process of production is simple, huge pressure is needed unlike compressing processing, equipment die also complexity very, simultaneously molding time is very long, more than ten times of normally other processing methods.
In new machining method, melt plate embryo is at the uniform velocity unidirectional under the traction of sheet material hauling machine to be moved backward, goods made by the mould that process is arranged on pressure apparatus and guillotine, after goods are separated with plate embryo corner, continue at the uniform velocity unidirectionally under the traction of sheet material hauling machine to move backward, pressure forming apparatus return gets back to assigned address, and wait instruction signal carries out forming process next time, thus the circulation uninterruptedly realizing thin-gage goods is produced.In this regard, new machining method for the production of thin-walled wide cut plastic products, than injection moulding, blow molding, plastics sucking moulding with compressingly have larger advantage.
Compared with prior art, the present invention is the new machining method of the continuous directly compression molding of a kind of thermoplastic thin-walled melt, new machining method is the new method of a kind of thin-walled wide cut melt directly compression molding in the molten state, achieve the shaping of thin-walled wide cut goods complicated shape, and product surface hardness is high, size is accurate, shape is full, corner angle are clearly demarcated.It is molded that new machining method also achieves continuous continual cyclic module, and the technological process of production is simple, and with short production cycle, production efficiency is high.New machining method uses the compound system of thermoplastic, inserts, Heat Conduction Material and auxiliary agent, the goods produced are except meeting except the instructions for use of conventional articles, also achieve price cheapness, light weight, density are little, good rigidly, intensity large, product also has waterproof, mildew-resistant, insect protected, the function such as fire-retardant, anti-oxidant.
Accompanying drawing explanation
Fig. 1 is production line configuration diagram of the present invention;
Fig. 2 is present invention process flow chart.
Drawing reference numeral illustrates:
1-high-speed mixer; 11-helical feeder; 2-comminutor; 21-vacuum feeder; 3-plate-extruding machine; 4-board mould; 5-sheet material hauling machine; 6-pressure apparatus; 61-pulley; 62-guide rail; 63-hydraulic cylinder; 64-support; 65-oscilaltion platform; 66-punch; 67-die; 7-guillotine; A-compound; B-particle; C-goods slab; D-goods.
Detailed description of the invention
Below in conjunction with accompanying drawing 1-2 and specific embodiment, the invention will be further described, but not as a limitation of the invention.
In goods of the present invention, its material is the composite be made up of following weight percent composition, thermoplastic 50% Corvic, wood powder 15%, Heat Conduction Material 10%, inserts 15% and auxiliary agent 10%, wherein thermoplastic comprises polyethylene, polypropylene, polyvinyl chloride, ABS, polystyrene polyester, Merlon, one or more of nylon etc., the present embodiment is adopted middle thermoplastic and is adopted Corvic, adopt the resin-oatmeal of the degree of polymerization 700, wood powder selects the pure wood powder doing coupling processing of more than 100 orders, Heat Conduction Material comprises aluminium powder, iron powder, the metallic monomer such as copper powder or aluminium oxide, magnesia, silicon nitride, the metals such as boron nitride or non-metal chemical and, in the present embodiment, Heat Conduction Material selects 400 object aluminium oxide, 400 object calcium carbonate selected by inserts, auxiliary agent comprises stabilizing agent, external lubricant, in-lubricant, foaming control agent, nucleator, mould inhibitor, antioxidant etc.
First, above each component according to formula rate, render in the mixed at high speed/cold mixing machine 1 of 500/1000L, start high-speed mixer 1 until temperature of charge 110 DEG C, then blowing is cooled to temperature of charge 40 DEG C to cold mixing machine, material is discharged cold mixing machine and is obtained compound a, completes mixing and the preplasticizing of material.
The compound a of 40 DEG C is cooled to be sent on the hopper of dual-screw pelletizer 2 by spiral material loading 11 device; compound a is sent in the screw rod of dual-screw pelletizer 2 through feeder; through the shearing of heat exchange and screw rod; compound a melting is become diameter phi 3.5mm adhesive tape by screw rod transmission and extruding through the granulation die of comminutor 2; adhesive tape is cut into the particle b of φ 3.5mmX3mm by rotary cutter, and particle b send cooling to store through wind.
Conventional particle b is through 95 DEG C of heated-air dryings after 1 hour, the hopper in singe screw plate-extruding machine 3 is transported to by vacuum feeder 21, particle b directly enters the screw rod of singe screw plate-extruding machine 3 under gravity, through heat exchange and shearing with screw rod and machine barrel, the AC blowing agent that in particle b, inserts contains can discharge a large amount of gas, and the particle b melt of melting is shaped to 2mm foamable molten slab through 500mm wide plate timber die 4.
2mm foamable molten plate embryo is under the draw of drum-type sheet material hauling machine 5, move to the direction of drum-type sheet material hauling machine 5 by between the oscilaltion platform 65 of pressure apparatus 6 evenly, the lifting platform of work up and down 65 of pressure apparatus 6 has respectively installed punch 66 and the die 67 of molding die, pressure apparatus 6 is after receiving the control command of matched moulds, the concave-convex mold of molding die closes up under the hydraulic cylinder 63 pressure effect of pressure apparatus 6, complete once molding formed process, foamable molten plate indusium is molded into sheet embryo c, the molding die simultaneously closed up and foamable molten plate embryo complete heat exchange rapidly, make the sheet embryo c that foamable molten plate embryo cooling and shaping is, the concave-convex mold inside of molding die is provided with cooling device, be specially the cooling water channel of circulation, recirculated cooling water is taken away the heat of molding die and the heat exchange of foamable molten plate embryo rapidly.
In the process of compression molding, the bottom of pressure apparatus 6 be provided with synchronous shifter, specifically comprise pulley 61, guide rail 62, described pulley 61 is arranged on the bottom of support 64, described guide rail 62 is arranged on the downside of pressure apparatus 6, described pressure apparatus 6 is socketed on guide rail 62 by pulley 61, pressure apparatus 6 synchronously moves to sheet material hauling machine direction with sheet embryo c, after the compression molding completing sheet embryo c, the oscilaltion platform 65 of pressure apparatus 6 is opened, the sheet embryo c demoulding after shaping continues mobile to sheet material hauling machine 5 direction, pressure apparatus 6 oppositely gets back to initial operating position by synchronous shifter, the whole shaping work time is approximately 15 seconds, then the forming process of next round is carried out in wait-receiving mode instruction.
Goods slab c is through sheet material hauling machine 5, working region between the lower work platform entering into guillotine 7, between the lower work platform of guillotine 7, cutting die and backing plate are housed, guillotine 7 receive cut instruction time, the lower work platform of guillotine 7 closes up under the effect of hydraulic pressure, what complete ceiling c and leftover pieces cuts separation process, obtains goods d.After guillotine 7 completes cutting of goods d, the lower work platform of guillotine 7 is separated, wait instruction carry out next time cut process.
Above embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that the common engineers and technicians in this area make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determine.
Claims (3)
1. a thermoplastic thin-walled melt direct compression-moulding methods continuously, is characterized in that, comprise the following steps of carrying out that uninterruptedly circulate continuously:
A. by the components by weight percent of thermoplastic 50%, wood powder 15%, inserts 15%, Heat Conduction Material 10%, auxiliary agent 10%, put into high-speed mixer and make compound;
B. the compound in step a is put into comminutor and makes particle;
C. the particle in step b is rendered to plate-extruding machine and form melt through heat transfer and shearing;
D. the melt in step c is formed melt plate embryo through board mould;
E. the mould of melting slab on pressure apparatus in steps d is pressed into sheet embryo;
F. the goods slab in step e is cut rear separation by the traction of sheet material hauling machine to guillotine, obtain finished product.
2. thermoplastic thin-walled melt continuously directly compression-moulding methods according to claim 1, is characterized in that, in step e in the compacting of sheet embryo and step f between the cutting of sheet embryo for substep carries out or synchronously carries out.
3. thermoplastic thin-walled melt continuously directly compression-moulding methods according to claim 1, is characterized in that, the pressure apparatus in step e is hydraulic pressure device or pneumatic compression device or mechanical press device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510675674.6A CN105216255A (en) | 2015-10-16 | 2015-10-16 | A kind of thermoplastic thin-walled melt direct compression-moulding methods continuously |
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| CN201510675674.6A CN105216255A (en) | 2015-10-16 | 2015-10-16 | A kind of thermoplastic thin-walled melt direct compression-moulding methods continuously |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107538718A (en) * | 2016-06-25 | 2018-01-05 | 绍兴仁通塑胶有限公司 | A kind of plastic pipe pipeline production line |
| CN108752723A (en) * | 2018-05-28 | 2018-11-06 | 赵锋 | A kind of preparation method of thermal conductivity plastic composite |
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| CN101200114A (en) * | 2006-12-14 | 2008-06-18 | 王威强 | Plastics extrusion melt roughcast transfer molding process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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