CN102837378B - Recycling method and recycling device of market-recycled foam resin container - Google Patents
Recycling method and recycling device of market-recycled foam resin container Download PDFInfo
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- CN102837378B CN102837378B CN201110339055.1A CN201110339055A CN102837378B CN 102837378 B CN102837378 B CN 102837378B CN 201110339055 A CN201110339055 A CN 201110339055A CN 102837378 B CN102837378 B CN 102837378B
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Abstract
The invention provides a recycling method and a recycling device of a market-recycled foam resin container, which can recycle the foam resin sheet molding container recycled from the market in short time by using less energy and lower cost compared with the prior art. The foam resin sheet molding container recycled from the market is roughly crushed and formed into roughly crushed materials with an average size approximately being 7-300cm2. After the roughly crushed materials are subjected to necessary cleaning process, the cleaned roughly crushed materials are not heated and dried but subjected to physical dehydration process to control the moisture approximately below 18wt%. After the dehydration process, the roughly crushed materials with moisture being approximately below 18wt% is finely crushed and formed into finely crushed materials with an average size approximately being 0.2-6cm2, and the finely crushed materials are put into a fusion extruder to reduce the volume and fuse the finely crushed materials, and finally a recycled fused resin is produced. The heating drying process is not needed, thus the low energy consumption and low cost are realized.
Description
Technical field
The present invention relates to a kind of method and apparatus Foamex slice forming container reclaimed from market being carried out recycling as regenerating resin.
Background technology
Foamex container as the container containing of food or plate, and is widely used on market.Now, how should process the Foamex container after using and become social topics, about the resin Foamex reclaimed from market container reverted to again for raw material, namely carry out recycling about as regenerating resin, had multiple motion.
Following recycling device is described: by being dissolved in by foamed styrene in the organic solvents such as cinene (limonene) in patent document 1; then make this organic solvent carry out gasifying and being separated, thus obtain the recycling device having carried out granular regenerating resin.In addition, following cleaning method and device is described: in order to the PET bottle etc. of not carrying out foaming is carried out recycling in patent document 2, and PET is ground into thin slice, and use the rinse water etc. of heat to clean this thin slice, then rinsing is carried out, PET thin slice through rinsing process is removed moisture, and is carried out cleaning method and the device of the recirculation PET thin slice of heated-air drying process by hot-air drying device.
Prior art document
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2005-179466 publication
Patent document 2: Japanese Unexamined Patent Publication 2002-320932 publication
Summary of the invention
Invent problem to be solved
In the recycling method described in patent document 1, can be easy to dissolve the organic solvent of foamed styrene owing to employing, therefore need to remove to be included in and obtain the organic solvent in particle by recycling institute and the organic solvent after removal is reclaimed.For the removal of organic solvent, need the auxiliary devices such as large-scale vacuum plant, and need a large amount of energy and time, and, as regenerating resin, also require the acceptable concentration of organic solvent to reduce to such as to be less than 50ppm.In the method described in patent document 2 and device, due to not with an organic solvent, therefore do not need because of the energy needed for removal organic solvent and time, but need the PET thin slice through rinsing process remove moisture and carry out heated-air drying, heated-air drying then needs a large amount of energy.
Due to above-mentioned situation, present situation will obtain the regenerating resin that can be used as material resin and use from only expendable naval stores, just needs a large amount of energy and time, and also very large on the impact of environment.Therefore, need a kind of can with less energy and the shorter time and obtain regenerating resin, use after the recycling method and apparatus of resin.
Problem of the present invention is, a kind of recycling method and apparatus can tackling the resin of above-mentioned requirements is provided, specifically, problem of the present invention is, there is provided a kind of and with little energy and the very short time, the Foamex slice forming container reclaimed can be carried out the method and apparatus of recycling from market as regenerating resin.
For solving the means of problem
The present inventor carries out making great efforts research result in order to solve above-mentioned problem is, find for naval stores, especially Foamex thin slice carried out thermoforming and the naval stores obtained, to be carried out after pulverizing and in water-immersed situation, rinse water can enter into the inside of crushed material from the plane of disruption thus its moisture content be increased due to objects such as cleanings.On the other hand, also found, for the moisture being attached to surface, even if do not carry out heat drying process, also can remove moisture at short notice by the physics processed of such as centrifugation.
In addition, the present inventor also finds: will obtain regenerating resin from resin foamed product, needs the crushed material of resin foamed product to put in melt extruded machine, and carries out the grainy treatment subtracting appearance and melting.Now, if the water content of the crushed material dropped into is larger, then cannot squeeze out molten resin with stable state from melt extruded machine, thus the regenerating resin of high-quality cannot be obtained, therefore, the water content of crushing resin when putting into melt extruded machine, even if change to some extent according to the degassing performance of used melt extruded machine, is also preferably roughly below 18wt%.
As mentioned above, when the crushed material of the naval stores obtained when Foamex thin slice is carried out thermoforming, the moisture be attached on surface due to cleaning treatment etc., can be removed at short notice by physics processed.Therefore, initial coarse crushing and ensuing fine powder broken two stages are carried out to the recovery article from market, water and alkali or soap is utilized to carry out cleaning treatment under state after coarse crushing, after mincing carried out processed to the meal after cleaning, it is broken and put in melt extruded machine to carry out fine powder.Now, by the size Control that minced by meal within the limits prescribed, meal can be reduced to mince the amount of moisture entering into crushed material inside from the described plane of disruption in each constant volume.Therefore, even if do not mince to the meal after cleaning carry out heat drying process, and the physics processed of only carrying out as centrifugation, also can realize at short notice and utilize little energy and water content is reduced to putting into melt extruded machine without any effect.The present invention completes based on above-mentioned new discovery.
Namely, first invention of the application is a kind of recycling method that foamed resin container is reclaimed in market, described method is used for the Foamex slice forming container reclaimed from market to carry out recycling as regenerating resin, it is characterized in that, described method at least comprises following operation: foamed resin container is reclaimed in described market and carries out coarse crushing, and makes average-size and be roughly 7 ~ 300cm
2the operation that minces of meal; Described meal is minced and carries out the operation of water cleaning; Utilize the warm water being roughly 30 DEG C ~ 70 DEG C containing alkali or soap, the meal after described water cleaning is minced the operation of cleaning; To the meal after the cleaning of described warm water mince do not carry out heat drying and by physics processed, make its water content reach the operation being roughly below 18wt%; Mince that to carry out fine powder broken by reaching the meal being roughly below 18wt% after described processed, and make average-size and be roughly 0.2 ~ 6cm
2the operation that minces of fine powder; Utilize melt extruded machine to mince to described fine powder and subtract appearance and melting, and make the operation of regeneration molten resin.
In addition, second invention of the application is the recycling device that foamed resin container is reclaimed in a kind of market, it carries out recycling for the Foamex slice forming container will reclaimed from market as regenerating resin, it is characterized in that, described recycling device at least comprises following equipment: Roughpulverizer, it carries out coarse crushing for foamed resin container is reclaimed in described market, and makes average-size and be roughly 7 ~ 300cm
2meal mince; Water washer, it carries out water cleaning for mincing to generated described meal; Warm water cleaning machine, it is for utilizing the warm water being roughly 30 DEG C ~ 70 DEG C containing alkali or soap, minces clean the meal after described water cleaning; Dewaterer, it can mince to the meal after the cleaning of described warm water and does not carry out heat drying and utilize physics processed, thus its water content is reached be roughly below 18wt%; Slimer, it carries out fine powder for mincing to the meal after described processed broken, and makes average-size and be roughly 0.2 ~ 6cm
2fine powder mince; Melt extruded machine, it subtracts appearance and melting for what carry out that described fine powder minces, and makes regeneration molten resin.
As mentioned above, market is reclaimed foamed resin container and carry out recycling as regenerating resin, need the cleaning treatment using water, make molten resin to use melt extruded machine also to need the most moisture being used for cleaning to remove from crushed material, but according to the present invention, the heat drying process as heated-air drying need not be carried out, and just can remove this moisture only by physics processed.Therefore, the processing method of described recycling and device, can realize reduction and the reduction in processing time of used energy simultaneously, and can alleviate the burden to environment.
In the present invention as in the physics processed of centrifugation, although can remove being attached to the moisture that meal minces on surface at short notice, being difficult to remove from crushed face, being immersed in inner moisture.Therefore, water content in the per unit volume (such as 100L) needing the meal after by processed to mince (crushed face minced from each meal is immersed in the total amount of inner moisture), control be substantially equal to or be less than or equal to this meal is minced carry out melting by melt extruded machine time, the amount that can discharge from its exhaust outlet as steam.
In the experiment of the present inventor, when employing the general melt extruded machine of the existing recycling process for Foamex, if meal market being reclaimed foamed resin container minces and is ground into its average-size and compares 7cm
2time less, then the summation of the crushed face of per unit volume that meal minces becomes excessive, thus exceedes and can carry out the ability of discharging as steam from exhaust outlet, stably cannot obtain regenerating resin.In addition, make average-size compare 300cm when meal market being reclaimed foamed resin container minces
2when larger, meal is minced be transplanted on next operation time, then can produce the fault of blocking in pipe arrangement.Therefore, in the present invention, market is reclaimed foamed resin container to carry out coarse crushing and make average-size being roughly 7 ~ 300cm
2meal mince, be that necessary invention forms item.
Dirt can be remained on the surface of the Foamex slice forming container reclaimed from market.This dirt is removed to necessity process of the regenerating resin being acquisition high-quality.In the present invention, meal is minced and carries out water cleaning, that item is formed to the invention of necessity that protein type soil is removed, utilizing being roughly the warm water of 30 ~ 70 DEG C, mincing clean the meal after water cleaning containing alkali or soap, is form item to the invention of necessity that grease class dirt is removed.
As mentioned above, carry out subtracting appearance and melting in order to the crushed material of resin foamed product is put in melt extruded machine, and from melt extruded machine, stably squeeze out the regenerating resin of high-quality, and the water content be preferably in molten resin is as far as possible very low.For this reason, mostly be 18wt% most by the water content of crushing resin when putting into melt extruded machine being set to, thus roughly whole amounts can be discharged from exhaust outlet.Therefore, in the present invention, need not mince to the meal after the cleaning of described warm water and carry out heat drying process and by physics processed and at short notice and utilize little energy that its water content just can be made to reach to be roughly below 18wt%, to be necessary invention formation item.
In common melt extruded machine, hold and melting to carry out good subtracting to the crushed material of input Foamex, and the average-size that preferred powder minces is roughly 0.2 ~ 6cm
2.Therefore, in the present invention, mince that to carry out fine powder broken and make average-size and be roughly 0.2 ~ 6cm to reaching the meal being roughly below 18wt% after described processed
2fine powder mince, the invention that just necessitates forms item.
In the present invention, described fine powder is minced and puts in melt extruded machine, and carry out same as the prior art subtracting appearance and melt process.As mentioned above, in this process, be immersed in fine powder mince in moisture, from the exhaust outlet being arranged at melt extruded machine be discharged to outside.Water content being reduced to be roughly the regenerating resin of the high-quality of 0wt% by discharging moisture, stably being extruded from the extrusion mouth of melt extruded machine, being cut out after cooling as particle or flake.Then, by obtained regenerating resin individually or to carry out mixing reshaping with virgin resins be container, plate etc.
In the present invention, the melt extruded machine used both can be the extruder of monomer, also can be the multistage extruder that the first melt extruded machine and the second melt extruded machine carry out arranged in series mode.When adopting the latter, the multistage melt extruded machine connecting portion between the molten resin extrusion mouth of the first melt extruded machine and the molten resin introducing port of the second melt extruded machine being formed with pressure-reducing chamber can be used in.When adopt at connecting portion, there is the multistage melt extruded machine in pressure-reducing chamber time, be included in evaporating in regenerating resin grade, therefore, it is possible to obtain the regenerating resin of high-quality more owing to removing further.
In the present invention, the resin types of Foamex slice forming container reclaimed from market, expansion ratio, shape and size are arbitrary, not special restriction.When having made meal and having minced, because the amount of moisture immersed from its crushed face is little, therefore the present invention has been suitable for the recycling of the more foamed styrenic resins container of separated foam.Although the expansion ratio of multiple Foamex slice forming container that expansion ratio is subject to reclaiming from market affected, the container viewed from the viewpoint of intensity and thermal insulation roughly in the scope of 5 ~ 22 times is more, and the present invention can be suitable for this kind of container.
Invention effect
According to the present invention, with little energy, very short time and do not use Minton dryer or hot-air drying device, thus the Foamex slice forming container reclaimed from market can be carried out effective recycling as regenerating resin.
Accompanying drawing explanation
Fig. 1 is, for illustration of the process chart of an embodiment of recycling system according to the present invention.
Fig. 2 is, for illustration of the first figure of an embodiment of recycling device according to the present invention.
Fig. 3 is, the second figure after the first figure.
Fig. 4 is, for illustration of the figure of an embodiment of melt extruded machine used in the present invention.
Reference numeral
1 Roughpulverizer
2 silos
3 water washers
4 conveyer belts
5 warm water cleaning machines
6 cleaning drag-over units
7 dewaterers
8 slimers
9 silos
10 melt extruded machines
Detailed description of the invention
Referring to the installation drawing shown in the process chart shown in Fig. 1 and Fig. 2 ~ Fig. 4, the preferred embodiment of the present invention is described.
The plastic holding device as recycling object in the present invention is the Foamex slice forming container reclaimed from market.The plastic holding device reclaimed from market is all that the object of many types mixes, first, from the container molding (S10) wherein sub-electing Foamex thin slice usually.After sorting, as required cleaning treatment (S11) is carried out to the plastic holding device sub-elected.Also this process (S11) can be omitted.In addition, the container molding of Foamex thin slice is just become as the plastic holding device of recycling handling object.Sorting work can be carried out sometimes by hand, and due to compared with the container molding of non-foamed resin, the weight of the container molding of Foamex thin slice is relatively light, therefore also can utilize pneumatic separator etc.
Secondly, utilize existing known suitable Roughpulverizer 1, coarse crushing is carried out to the plastic holding device sub-elected, and make average-size and be roughly 7 ~ 300cm
2meal in scope minces (S12).As required, also can be kept in the silo 2 as buffer (S13).Then, utilize water washer 3 pairs of meal to mince and carry out water cleaning (S14).The preferred device using rotating vane or propeller mode of water washer 3, has flowed into water wherein and meal minces, and washes protein and foreign matter (solid content) off.Preferably water washer 3 is obliquely installed in the mode about level ~ 30 °, has dropped into water from the one end, upper reaches tilted and meal minces, and the meal after the other end takes out cleaning minces.
Then, utilize conveyer belt 4 etc., the meal after cleaning is minced and removes moisture and carry out transferring (S15), put in warm water cleaning machine 5 and carry out warm water cleaning (S16).Warm water cleaning machine 5 utilizes the warm water being roughly 30 ~ 70 DEG C containing alkali or soap to carry out cleaning object thing, and it preferably adopts rotating vane or propeller mode, stirs and is washed off by lubricant component.Preferably be obliquely installed in the mode about level ~ 30 ° by warm water cleaning machine 5, dropped into rinse water and meal minces from the one end, upper reaches tilted, the meal after the other end takes out cleaning minces.
Then, utilize the meal after the cleaning of cleaning drag-over unit 6, the 6 pairs of warm water mince (S17, S18) transfer.Cleaning drag-over unit 6 be by mincing from warm water cleaning machine 5 meal out, the beating of one side water while carry out cleaning and transferring, this cleaning drag-over unit 6 can be a machine, also can be the multiple stage machine of arranged in series as shown in the figure.In order to remove moisture well, it arranges angle and is preferably, to arrange towards the mode of transfer direction inclination 5 ~ 45 °.
Complete until the operation of described S18, then meal is minced and carry out necessary cleaning treatment and just finish.In S18 operation eliminate moisture after the meal surface of mincing on be attached with moisture, and the foaming bubble by occurring at its plane of disruption, moisture also can be immersed in the inside being approximately about 1 ~ 3mm apart from the plane of disruption.
Then, mince from cleaning drag-over unit 6 meal out, put in dewaterer 7 and carry out processed (S19).The dewaterer 7 used can be the physics dewaterer of helical pressure formula or centrifugation formula etc., and does not need use to be accompanied with the heat treated drying machines such as heating warm air process.Carry out processed by dewaterer 7, thus the water content that meal is minced reaches and is roughly below 18wt%, be preferably below 10wt%.
Then, water content is reached the meal being roughly below 18wt% and mince, putting into slimer 8, to carry out fine powder broken, and make average-size and be roughly 0.2 ~ 6cm
2fine powder mince (S20).If fine powder minces have above-mentioned size, then from the exhaust outlet of melt extruded machine, can remove moisture fully, that stably can carry out that fine powder minces subtracts appearance and melting and extrudes.As required, by carry out with slimer 8 fine powder broken after fine powder mince and be stored in (S21) in silo 9.
Finally, fine powder is minced put into (S22) in melt extruded machine 10.In the process that input fine powder minces by melt extruded machine 10, this fine powder minces to be subtracted and holds and be heated and pressurized and carry out melting.In this process, from the exhaust outlet being arranged at melt extruded machine 10, can fully remove substantially be included in fine powder mince in be roughly below 18wt%, be preferably the moisture of below 10wt%.Therefore, the regenerating resin of high-quality stably can be squeezed out from the extrusion mouth of melt extruded machine 10.Form for melt extruded machine does not limit, and suitably can select the two-shipper of material bin with pressure, unit or tandem extruder etc.In addition, about melt extruded machine 10, will be described in detail hereinafter.
From the regenerating resin that melt extruded machine 10 squeezes out, be made into graininess (S23) by such as existing known comminutor 11, then, suitably take care of with bag or silo etc.
As mentioned above, in the recycling method and device of recovery foamed resin container in market according to the present invention, when removing moisture accompanying when cleaning from the crushed material after cleaning, even if do not use the heat drying apparatus needing lot of energy, also can by moisture removal and till reaching required water content, by mincing made after fine powder minces by removing the meal after moisture, then put in melt extruded machine, good regenerating resin can be obtained.Thus, compared with existing recycling method and device, recycling method of the present invention and device can with little energy, lower cost, cheap equipment carry out the regeneration of resin at short notice.
In the present invention, although be supplied in the water of described water washer 3, cleaning drag-over unit 6, can be directly discharged into outside system after treatment, in order to effectively utilize water, preferably water be carried out cycling and reutilization.Therefore, recommend as under type: by the water of discharging from water washer 3, cleaning drag-over unit 6 and dewaterer 7, directly turn back in water treatment facilities 21 by process water reflux pump 20, after having carried out necessary clean water treatment herein, resupply in water washer 3 and cleaning drag-over unit 6.In addition, as shown in the process chart of Fig. 1, owing to needing to use more water at cleaning machine 3 place, therefore, also the water can will discharged from water washer 3, cleaning drag-over unit 6 and dewaterer 7, after circulating in cleaning machine 3 and conveyer belt 4, returned it in water treatment facilities 21 by process water reflux pump 20.
In the present invention, being roughly containing alkali or soap the rinse water used in the warm water of 30 ~ 70 DEG C, the operation of cleaning that the meal after water cleaning minced about utilizing, also can being directly discharged into outside system after treatment.But, in order to effectively utilize rinse water, and preferably build the circulatory system and recycle.
In the process chart of Fig. 1, illustrate an example of the circulatory system.Here, the circulatory system is made up of first module 30 and second unit 40, and described first module 30 comprises: as the source pump 31 of thermal source, for guaranteeing surge tank 32 and the heat exchanger 33 of heat exchange institute calorific requirement; Described second unit 40 comprises: by the tank 41 carrying out temporarily storing from cleaning drag-over unit 6 process water out, coarse filter 42, by the tank 43 carrying out temporarily storing from coarse filter 42 process water out, accurate filter 44, by the tank 45 that carries out temporarily storing from accurate filter 44 process water out and described heat exchanger 33.
First module 30 is that the temperature of cleaning warm water for making to be supplied in warm water cleaning machine 5 is to the device being roughly 30 ~ 70 DEG C, the thermal medium (hot water) of generated by source pump 31 40 ~ 80 DEG C is transported in heat exchanger 33, through carrying out heat exchange with the cleaning warm water containing alkali or soap by this place, thus cleaning warm water is warmed up to be roughly 30 ~ 70 DEG C.In addition, source pump 31 is an example of thermal source, and other thermal source also can use boiler, heater, recycle oneself exhaust of generating or the used heat etc. of cooling water.
Second unit 40 is circulatory systems of described cleaning warm water.The rinse water containing alkali or soap in alkali water tank 46, is raised to by described heat exchanger 33 and is roughly after 30 ~ 70 DEG C, then injects from the entrance top of described warm water cleaning machine 5 or drop into shower shape.Then, be discharged to cleaning drag-over unit 6 together with mincing with meal in the outlet top of warm water cleaning machine 5.When by cleaning drag-over unit 6, minced by cleaning warm water be separated with meal, cleaning warm water is temporarily stored in tank 41.
Then, cleaning warm water is stored in tank 43, by being transplanted on accurate filter 44 here eliminate foreign matter in coarse filter 42 after again.In coarse filter 42, the foreign matter that eyes can see degree can be removed, in accurate filter 44, foreign matter can be removed to and effect is not had to use heat exchanger 33.In addition, coarse filter 42 and the accurate filter 44 with this function can be known products, thus omit and are described in detail.The cleaning warm water containing alkali or soap that have passed accurate filter 44 is shifted in described heat exchanger 33 after being stored into tank 45 again.Carry out circulation time at cleaning warm water as above, the rinse water of insufficient section is supplemented by described alkali water tank 46.
In addition, in described tank 45, thermometer 47 is installed, for measuring the temperature of the cleaning warm water being transported to heat exchanger 33.Temperature information is transported to not shown control device, and the temperature be used in heat exchanger 33 controls.In addition, in accurate filter 44 and tank 45, be also provided with process water or the upper water conveying device 48 for carrying out backwash to the filter be located at herein.
Then, melt extruded machine 10 is described.As mentioned above, in the recycling method and device of recovery foamed resin container in market according to the present invention, the melt extruded machine 10 used, suitably can select the single-plicate of existing form known in this technical field or the melt extruded machine of multiple.But, by utilizing the novel melt extruded machine 10 shown in Fig. 4, the regenerating resin of high-quality more can be obtained.
Melt extruded machine 10 as shown in the figure has the first melt extruded machine 50 and the second melt extruded machine 60.Two melt extruded machines 10,60 itself can be existing known extruders.In this embodiment, the first melt extruded machine 50 comprises: the hopper 51 that the described fine powder for dropping into as regenerating resin raw material minces; The cylinder 52 be connected with the outlet side of this hopper 51; Carry out the raw material be supplied in cylinder 52 subtracting appearance and melting while carry out the screw rod 53 transferred; And the extrusion mouth 54 for extruding the regenerating resin subtracted after appearance, melting.Screw rod 53 carries out rotary actuation by suitable drive source M1.Although not shown, but in the periphery of cylinder 52, the suitable heater of the band heater for carrying out heating and melting to raw material etc. is also provided with.
Hopper 51 can use the structure of arbitrary form, uses forced hopper in the example shown in the series of figures, in order to only be pressed in cylinder 52 with ormal weight by raw material, hopper 51 is provided with supply screw rod 55.
Described screw rod 53 comprises: be positioned at the first screw rod 53a of side, upper reaches, material transfer direction and the second screw rod 53b of coupled dirty side.The connecting portion of the first screw rod 53a and the second screw rod 53b is formed with minor diameter part 56, with in the part of opposite cylinder 52, arranges the exhaust outlet 57 had for the function such as deaeration or moisture herein.As mentioned above, from this exhaust outlet 57, middle the comprised moisture that minces of the fine powder as regenerating resin raw material can be made to get rid of together with air, thus cause in the molten resin squeezed out by extrusion mouth 54 hardly containing moisture.
Second melt extruded machine 60 also comprises: cylinder 61, be configured in for transfer regeneration molten resin cylinder 61 in screw rod 62 and regeneration molten resin extrusion mouth 63.Screw rod 62 carries out rotary actuation by suitable drive source M2.Although not shown, but in the periphery of cylinder 61, the suitable heater of the band heater for controlling the temperature of regeneration molten resin etc. is also provided with.There is in the side, upper reaches of cylinder 61 regeneration molten resin introducing port 64, from the regeneration molten resin that the extrusion mouth 54 of described first melt extruded machine 50 squeezes out, enter into molten resin introducing port 64 by connecting portion 100 hereinafter described.The regeneration molten resin entered is transported to extrusion mouth 63 quantitatively by the rotation of the screw rod 62 for transferring regeneration molten resin, and is discharged quantitatively.
Described connecting portion 100 is described.Connecting portion 100 comprises: the pipe section 101 be connected with the described extrusion mouth 54 in the first melt extruded machine 50; And the dirty side 102 of this pipe section 101 is in the pressure-reducing chamber 103 of open state.Further, the dirty side in pressure-reducing chamber 103 is connected with the resin introducing port 64 of described cylinder 61.Connecting portion 100 is Integral sealing structures, and be made into make regeneration molten resin through its inside not with contacting external air and by structure.
The bore of pipe section 101 is made identical with the bore of extrusion mouth 54 or roughly the same, although this not necessarily, but in this embodiment, way is provided with pressure-regulating device 104 wherein, and described pressure-regulating device 104 can regulate the pressure acted on through the regeneration molten resin of pipe section 101.From the viewpoint that the simplification of structure and being easy to operates, pressure-regulating device 104 is preferably, the choke valve that can control the afocal variable of pipe section 101, but is not limited thereto, and also can arrange the baffle plate as melting dividing plate in pipe section.
Described pressure-reducing chamber 103 is connected with not shown vavuum pump, by not shown control device, and will remain on required decompression state in pressure-reducing chamber.Further, although not necessarily, in the example shown in the series of figures, in pressure-reducing chamber 103, be in the dirty side of open pipe section 101, part flow arrangement 105 is installed.Part flow arrangement 105 is the devices using splitting into many streams from pipe section 101 as the regeneration molten resin that a stream flows out, and by shunting, and the surface area being in the molten resin of decompression state in pressure-reducing chamber 103 is increased.
In above-mentioned melt extruded machine 10, using the raw material being used for regenerating resin minced as described fine powder, be supplied in cylinder 52 from hopper 51.The raw material supplied, while heated by not shown heater, is transported to extrusion mouth 54 by screw rod 53 in cylinder 52.The compression force corresponding with the shape of screw rod 53, on raw material, utilizes this compression and shearing force, thus resin raw material (fine powder minces) is little by little subtracted hold and carry out melting.In addition, also little by little the degassed of raw material is carried out.And, utilize the connecting portion of the first screw rod 53a and the second screw rod 53b can temporarily make acted on pressure reduce, thus make the air in raw material, moisture and evaporate into the major part of grading to carry out degassed from exhaust outlet 57.
Carry out the regeneration molten resin after degassed and dehydration, flow in the pipe section 101 of connecting portion 100 from the extrusion mouth 54 of cylinder 52, and be extruded in pressure-reducing chamber 103 from its dirty side 102.Described extrusion mouth in pressure-reducing chamber 103 is provided with part flow arrangement 105, the regeneration molten resin squeezing out (outflow) from pipe section 101 as a stream is split into many.Thus, the surface area regenerating molten resin can increase according to the number of shunting.
On the other hand, decompression in pressure-reducing chamber 103 is made to arrive required vacuum by the effect of vavuum pump, under the state that the regeneration molten resin that surface area increases is exposed to decompression.Thus, the volatile ingredient existing for the surface of regeneration molten resin and inside and residual a small amount of moisture, also can remove effectively from regenerating resin.Then, by volatile ingredient and moisture by the regeneration molten resin after removing roughly completely, flow in cylinder 61 from the resin introducing port 64 of the second melt extruded machine 60, be transported to extrusion mouth 63 quantitatively by the screw rod 62 for transferring regeneration molten resin, and quantitatively discharged from here.From extrusion mouth 63, by the regeneration molten resin of quantitatively discharging, its volatile ingredient and moisture are removed roughly completely, thus can obtain the regenerating resin be of high quality.
In addition, be preferably, pressure-reducing chamber 103 has the space can extracting volatile ingredient and residual a small amount of moisture by vacuum fully out, and only has the size that the stream that splits into multiple regeneration molten resins can not contact with each other.Regeneration molten resin after shunting out until the time of staying contacted with the screw rod 62 of the second melt extruded machine 60, is generally 1 second more than from part flow arrangement 105, is preferably 1.5 seconds more than.This time of staying can regulate according to the shape and size in pressure-reducing chamber 103 and control amount of compression.When the time of staying in pressure-reducing chamber 103 is not enough, by arranging the barrier devices such as wire netting, the such device of multilayer can also be set if desired to regulate the time of staying.In addition, the melt extruded machine shown in Fig. 4, has been described in detail in No. 2011-124371, the patent application Patent of the applicant.
In addition, from the melt extruded machine 40 shown in Fig. 4, eliminate the melt extruded machine of described pressure-reducing chamber 103 mode or only have separately the extruder of the first melt extruded machine 50, also can use as melt extruded machine of the present invention.
Embodiment
Then, the example of the reality that the present inventor carries out is described.In an experiment, multiple Foamex slice forming containers of Interim use reclaim arbitrarily from the market.This recovery article is put in pulverizer, by changing the size of the screen pack be arranged under pulverizer, the size (cm thus the average meal made as shown in 1 ~ 7 of table 1 minces
2) the sample that minces of meal.In addition, due in used pulverizer, cannot obtain the average-size that meal minces is 100cm
2above sample, thus utilizes the crush-cutting device of band blade to be made above-mentioned sample.
Each sample is carried out to the operation of the S14 ~ S22 in Fig. 1.In this process, mince size, water content (dehydration/fine powder is broken afterwards) of average scavenging period, comminuted powder amount, average fine powder is measured.In addition, as melt extruded machine, employ the melt extruded machine eliminating described pressure-reducing chamber 103 mode from the melt extruded machine 40 shown in Fig. 4, being undertaken dewatering by utilizing dewaterer 7 and utilizing slimer 8 to carry out the broken average-size of fine powder is 0.9 ~ 2.4cm
2fine powder mince and be stored in silo 9, state when making its melting by melt extruded machine 10 and extrude from the nozzle of extrusion mouth 63 is evaluated.Its result is as shown in table 1.
Following measurement has been carried out to average meal size and the average fine powder size that minces that minces.Namely, by the meal in crushed material mince be put into a limit be 10cm rise in bucket, fine powder mince be put into a limit be 5cm rise in bucket, carry out pulverizing carried out every 5 ~ 10 minutes 5 times sampling.But, pulverizing is of a size of 50 ~ 100cm
2crushed material, be collected in a polybag of 180mm × 270mm, will more than 100cm
2crushed material, be collected in a polybag of 300mm × 450mm, similarly carry out pulverizing carried out every 5 ~ 10 minutes 5 times sampling.When sample is not rectangle, using length direction as long limit, its vertical direction, as minor face, is measured its length respectively and carries out being multiplied thus as area, and calculates the mean value of each area risen in bucket.Repeatedly carry out 5 same operations, and using its weighted average as mean value.
Table 1
In addition, in Table 1:
Average scavenging period is the time by water washer 3, conveyer belt 4, warm water cleaning machine 5, two cleaning drag-over units 6,6 and dewaterer 7.
Comminuted powder amount is the amount of the powder produced when pulverizing, cleaning, the cleaning warm water containing alkali or soap of discharging together with the meal after cleaning with warm water is minced, after meal minces and is separated, 60 object wire nettings are set, and measure by the powder amount after filtering herein.
Water content (dehydration after) takes out the sample after dewaterer 7 of 100L, from the sample after just taking out and utilize weight difference between the abundant dried sample of drying machine, calculates this water content.
Evaluate
In sample 1 and sample 2, the water content that the fine powder after dehydration minces is 42wt%, 27wt% and water content increases.Because amount of moisture is more, unstable from melt extruded machine squeezed state out.This is because the average pulverizing of crushed material during coarse crushing is of a size of 4cm
2and it is too little, when cleaning, water can be immersed in inside from the crushed face of each crushed material the crushed material of per unit amount (such as 100L), the total amount of moisture increases, only utilize the processed of dewaterer 7 then cannot dewater fully, even if carry out dewater (dehydration) from the exhaust outlet 57 of melt extruded machine 10, also still moisture can be remained in regeneration molten resin.
In addition, in sample 1 and sample 2, because the average pulverizing size of crushed material is less, therefore the micro mist flour amount of subsequent processing can increase, the trend that the filtration burden that so just there will be cleaning warm water increases.
The average particle diameter size that the meal of sample 7 minces is 400cm
2and comparatively large, make the air of the pipe arrangement conveying that utilizes between each operation become difficulty, thus cause productivity to decline.In addition, the squeezed state putting into melt extruded machine after broken to fine powder is observed, and its result is that squeezed state is good.
In sample 3 ~ 6, utilize the air of pipe arrangement to carry good and productivity is very high, and squeezed state in melt extruded machine is stable and can extrude well.
Known in sum, carry out coarse crushing and make average-size being roughly 7 ~ 300cm by market being reclaimed foamed resin container
2meal mince, and mince that to carry out fine powder broken and make average-size and be roughly 0.2 ~ 6cm by reaching the meal being roughly below 18wt% after processed
2fine powder mince, and use existing known melt extruded machine and do not need to use heat drying apparatus, just can at short notice and utilize little energy and stably squeeze out the regenerating resin of high-quality.
Claims (4)
1. a recycling method for foamed resin container is reclaimed in market, and it carries out recycling for the Foamex slice forming container will reclaimed from market as regenerating resin, and it is characterized in that, described method at least comprises following operation:
Foamed resin container is reclaimed in described market carry out coarse crushing and make average-size being 7 ~ 300cm
2the operation that minces of meal;
Described meal is minced and carries out the operation of water cleaning;
Utilizing is the warm water of 30 DEG C ~ 70 DEG C containing alkali or soap, to mince the operation of cleaning to the meal after described water cleaning;
To the meal after the cleaning of described warm water mince do not carry out heat drying and by physics processed, make its water content be reached for the operation of below 18wt%;
Being minced by the meal being reached for below 18wt% after described processed, it is broken to carry out fine powder, and to make average-size be 0.2 ~ 6cm
2the operation that minces of fine powder;
Utilize melt extruded machine to mince to described fine powder and subtract appearance and melting, and make the operation of regeneration molten resin.
2. the recycling method of foamed resin container is reclaimed in market as claimed in claim 1, it is characterized in that,
Described method uses following melt extruded machine: described melt extruded machine comprises the first melt extruded machine and the second melt extruded machine of arranged in series, and the connecting portion between the molten resin extrusion mouth and the molten resin introducing port of the second melt extruded machine of the first melt extruded machine is formed with pressure-reducing chamber.
3. a recycling device for foamed resin container is reclaimed in market, and it carries out recycling for the Foamex slice forming container will reclaimed from market as regenerating resin, it is characterized in that, described recycling device at least comprises following equipment:
Roughpulverizer, it carries out coarse crushing and makes average-size being 7 ~ 300cm for foamed resin container is reclaimed in described market
2meal mince;
Water washer, it carries out water cleaning for mincing to generated described meal;
Warm water cleaning machine, it is the warm water of 30 DEG C ~ 70 DEG C for utilizing containing alkali or soap, minces clean the meal after described water cleaning;
Dewaterer, it can mince to the meal after described warm water cleaning and does not carry out heat drying and utilize physics processed, thus makes its water content be reached for below 18wt%;
Slimer, it carries out for mincing to the meal after described processed that fine powder is broken and to make average-size be 0.2 ~ 6cm
2fine powder mince;
Melt extruded machine, it subtracts appearance and melting for what carry out that described fine powder minces, and makes regeneration molten resin.
4. the recycling device of foamed resin container is reclaimed in market as claimed in claim 3, it is characterized in that,
Melt extruded machine comprises the first melt extruded machine and the second melt extruded machine of arranged in series, and described melt extruded machine is formed with pressure-reducing chamber on the connecting portion between the molten resin extrusion mouth and the molten resin introducing port of the second melt extruded machine of the first melt extruded machine.
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| JP2011139793A JP5480848B2 (en) | 2011-06-23 | 2011-06-23 | Recycling method and equipment for market recovered foamed plastic containers |
| JP2011-139793 | 2011-06-23 |
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| CN105269713B (en) * | 2015-11-17 | 2017-11-17 | 王仁杰 | Oil field waste plastic at low temperature crushes method for separating and processing |
| CN108437284B (en) * | 2018-04-25 | 2024-05-03 | 上海紫东尼龙材料科技有限公司 | Nylon reclaimed material recycling system |
| CN114290558A (en) * | 2021-12-31 | 2022-04-08 | 福建景丰科技有限公司 | Preparation method of chinlon 6 regenerated slices |
| CN114833961A (en) * | 2022-05-05 | 2022-08-02 | 安徽环嘉天一再生资源有限公司 | Recycled plastic bottle flake recycling and granulating production line and method |
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| JP2003062831A (en) * | 2001-08-27 | 2003-03-05 | Plan 21 Corporation | Apparatus for melting/volume-reducing polystyrene foam |
| ATE374794T1 (en) * | 2001-10-16 | 2007-10-15 | Teijin Ltd | METHOD FOR RECYCLING PET BOTTLES |
| CN101204837B (en) * | 2007-10-12 | 2010-05-19 | 东莞市蓝冠机械设备有限公司 | Discarded high foaming plastics regeneration pelleting process |
| CN101863091A (en) * | 2010-06-12 | 2010-10-20 | 广州丽盈塑料有限公司 | Recovery method of package level high-density polyethylene and polypropylene |
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| CN102837378A (en) | 2012-12-26 |
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