CN85101859A - Plastics (particularly hard PVC powder) film is extruded the method and apparatus with blowing continuously - Google Patents
Plastics (particularly hard PVC powder) film is extruded the method and apparatus with blowing continuously Download PDFInfo
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- CN85101859A CN85101859A CN85101859.9A CN85101859A CN85101859A CN 85101859 A CN85101859 A CN 85101859A CN 85101859 A CN85101859 A CN 85101859A CN 85101859 A CN85101859 A CN 85101859A
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- 238000007664 blowing Methods 0.000 title claims abstract description 20
- 239000000843 powder Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 15
- 229920003023 plastic Polymers 0.000 title claims abstract description 7
- 239000004033 plastic Substances 0.000 title claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 239000004014 plasticizer Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 238000000197 pyrolysis Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 39
- 238000007906 compression Methods 0.000 claims description 15
- 230000006835 compression Effects 0.000 claims description 15
- 238000009413 insulation Methods 0.000 claims description 9
- 230000015556 catabolic process Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 5
- 238000006731 degradation reaction Methods 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000007669 thermal treatment Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims 3
- 239000004800 polyvinyl chloride Substances 0.000 description 28
- 229920000915 polyvinyl chloride Polymers 0.000 description 28
- 238000001125 extrusion Methods 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 238000007872 degassing Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 239000003381 stabilizer Substances 0.000 description 5
- 230000008646 thermal stress Effects 0.000 description 5
- -1 polyethylene Polymers 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 239000011086 glassine Substances 0.000 description 3
- 235000012054 meals Nutrition 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 235000014036 Castanea Nutrition 0.000 description 1
- 241001070941 Castanea Species 0.000 description 1
- 229920000298 Cellophane Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 206010057040 Temperature intolerance Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- HGQSXVKHVMGQRG-UHFFFAOYSA-N dioctyltin Chemical compound CCCCCCCC[Sn]CCCCCCCC HGQSXVKHVMGQRG-UHFFFAOYSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008543 heat sensitivity Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-N o-dicarboxybenzene Natural products OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 235000021485 packed food Nutrition 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 235000021147 sweet food Nutrition 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/256—Exchangeable extruder parts
- B29C48/2564—Screw parts
-
- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
-
- 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
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- 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
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Plastic sheeting extrude method and apparatus with blowing continuously, being specially adapted to the PVC-U powder is raw material, need not to adopt plasticizer again.This raw material is compressed in advance by the co-operating between feed worm (20) that connects feed hopper (16) and the extruder operation screw rod (12).Screw rod (20) has the controllable angular speed that is higher than screw rod (12).Screw rod (12) comprising: first district (E), the screw rod in this district is heat-insulating, the heating flow axis is to feeding the screw rod body; The first heating compressional zone (K1); Heating plasticizing district (H); Add pyrolysis zone (D); The second heating compressional zone (K2) and a heating discharge area (A), end has a blowing head with a replaceable filter.
Description
The invention relates to plastic sheeting and extrude method with blowing continuously, particularly be applicable to the hard polyvinyl chloride film without plasticizer of used for packing foods.This law must be suitable for preventing the incidental all signs of degradation of hard PVC, even and also can obtain high-quality product under high yield.
Implement the used device of this law, by the custom-designed hopper of bringing the material screw rod into, have that the extruder of " the fast pressure " type extrusion screw rod and blowing head forms.
At present, the product of hard PVC film continue to rise, and has great commercial value for multiple use field, particularly for the transparent wrapper of food.Along with cellophane " glassine paper " little by little disappears from world market, further improved the importance of hard PVC film.As everyone knows, the production prices of glassine paper are again without any competitiveness, because the energy resource consumption height of per unit product, and the serious pollution problem of this method, relate to the serious problems that all contain the acid residue of high concentration in the gas that is discharged into atmosphere and the relief liquor.
In thermoplastic film, can replace glassine paper to pack the sweet food product with the transparent wrapper of single kink or two kink types, almost have only the PVC film.Being packaged on world's packaging market of this pattern is very general and crucial part.Other thermoplastic film is considered to invalid, and this is because it does not have good resistance to torsion.With other polymer be polyolefin polymer, opposite as polyethylene and polypropylene, PVC is in the very high heat sensitivity of tool more than 100 ℃, this temperature just decomposites hydrochloric acid and carbon is constantly destroyed thereby surpass.Owing to will obtain melting and uniform material, so the temperature when requiring extrusion blow is at 175-190 ° or even between 185-205 ℃.Therefore have to add stabilizing agent, improve the heat endurance of this material by means of function with synergism.
Make the recipe ratio of hard PVC film be easier to extrude by adding plasticizer, generally be to add phthalic acid ester and adipate ester, they can be adsorbed by resin-oatmeal during the preparation of compound, helps the processing of material, and the result has reduced the thermal stress of same rapidoprint.
In addition, have good homogeneous, adopt two manufacturing process sometimes, promptly will do mixed resin-oatmeal earlier and be extruded into pellet, then, the gained pellet was carried out for second step extrude, be extruded into blown film in order to guarantee product.
Obviously, adopt this middle comminution granulation can bring a lot of inconvenience, mainly be: extrude for twice and to twice thermal stress that material caused, reduce the engineering properties (particularly tensile strength, impact strength) and the aesthetic beauty (being the optical haze and the transparency) of film, also increased the energy resource consumption of unit in addition.
Adding plasticizer in the hard PVC prescription is very easily, as mentioned above, production technology can in the middle of the step of granulation, but the sanitary regulations of a lot of countries do not allow and adopt this class plasticizer, promptly forbid adding plasticizer in the hard PVC prescription as used for packing foods.Known hard PVC needs highly effective stabilizing agent, generally is to adopt dioctyl tin.If there is plasticizer simultaneously, then plasticizer is easy to move to the surface of film, and the component of passing stabilizing agent forms a kind of coloring agent and brings in the packaged food of contact with it and go.On the other hand, the manufacturing of hard PVC, begin just to be subject to the low material of employing heat endurance from powder, and in manufacture process, the torrid zone appearred in heat conduction low part easily, so just damaged the material that is extruded, for example cause variable color, reticulate and other defect, even reach total degraded, decomposite hydrochloric acid and carbon.
Low thermal stress though do not influence expressing technique, can cause variable color, makes the film color of the dried mixing manufacturing that has added last blue additive turn green, also can reduce mechanical performance of products.
Striated appears in more serious meeting, and color is more shallow during beginning, becomes dark chestnuts look up to the small powder that carbonization occurs subsequently.
When the carbonization cobbing touches the metal surface of extruder, just played the thermal degradation catalyst, make so-called " calcination " takes place on the PVC material.This is a kind of irreversible phenomena, overcome this phenomenon, has only stopping production, pulls down arm-tie and operation screw rod, and the parts of every material contact all will carefully be cleaned out, and after this time-consuming operation was finished, material will heat up again and could drive again.
Certainly, disassembly, cleaning and heating required time are decided by the size of machine, in any case but all will waste a large amount of time and influence production.
On extruder, process hard PVC, only limit the material of low thermal stability.In order to be reduced in the contradiction that needs high temperature in the manufacturing but must adopt low thermostability material, carried out test of many times.For material, high temperature only allowed in the very short time, and this is in order to prevent to destroy material.The problem that the blowing of hard PVC compound is extruded is to add plasticizer anything but, the single screw extrusion machine that this problem can have " the fast pressure " type by adopting one solves, the overall process of this extruder is very short, in order that will be limited the thermal stress bad influence that may occur as much as possible.
In order to obtain the product of high uniformity, even under high yield, also can produce high-quality film, need use according to special method of the present invention.That is:
-before raw material enters extruder, give first compression definitely in accordance with regulations, with the uniformity that prevents to fluctuate and guarantee to produce from the material that the blowing head comes out.
Each step of-this law reduce widely shared room and time (compression, melting, stir well, step-down and the degassing, continuous compression and stir evenly) in view of machinery and aesthetic view point, have high-quality product so that guarantee.
-melting the material that comes out from the blowing head evenly disperses, and has guaranteed that the thickness of film is very even.
The objective of the invention is to be to obtain the even and thin hard PVC film of thickness of food-grade, have the feature part of claim 1, can print fully, printing ink is had very good resistance.Can be used for packaging for foodstuff fully, can be used as the innermost layer packing of candy.
The method according to this invention is characterized in that raw material (the dried mixing of hard PVC) is in cold conditions, enters extruder under the condition of compression earlier continuously.
Compression is to be guaranteed by the co-operating between the operation screw rod of feed worm and extruder earlier, and prior condition is the angular speed that the angular speed of feed worm surpasses the extruder operation screw rod.
Detailed explanation of the present invention will be illustrated following, and with given accompanying drawing as a reference, wherein:
Fig. 1 is critical piece (vertical section) figure of extruder;
Fig. 2 is along the profile of II-II line among Fig. 1.Can see oil pipe of the present invention (28) and heat insulation (26) from here;
Fig. 3 is the vertical section enlarged drawing that Fig. 1 extruder central area is equivalent to degas zone and adjacent district;
Fig. 4 is the profile of Fig. 3 along IV-IV line, the profile of the pump that promptly outgases;
Fig. 5 is the enlarged drawing of degassing pump piston V-V part section of Fig. 4;
Fig. 6 is the location drawing (being the function of time) of degassing pump shaft;
Fig. 7 a, 7b, 7c, 7d are the axial sections according to each position of extruder screw of the present invention, at Fig. 7 c and 7d, show the insulation (26) of internal oil pipe especially;
Fig. 8 is the enlarged detail of the cutout ring that dwindles of the yardstick among Fig. 7 b.
Fig. 9 is the front end of extruder screw;
Figure 10 is the extrusion-blown modling head figure that has replaceable filters, (axial section).
No. 10 expression extruders among Fig. 1 comprise the extrusion screw rod 12 that is positioned at extruder barrel 14.In hopper 16, powdered resin mixes mutually with stabilizing agent and lubrication prescription, the compression under by being positioned at feed worm 20(Fig. 2 of pipeline 18), pass open interior 24(Fig. 2) send in the machine barrel 14 that is with extrusion screw rod 12, as shown in Figure 1.
After the compressional zone K2 is even thermal treatment zone A, and screw rod wherein has constant external diameter, but the partial-length of restriction screw rod has certain internal diameter along same length, and described screw rod has the end of taper, near extrusion die.The effect in this district is that material is squeezed into the tubular plastic of plasticizing fully.Utilize the method for same radially blowing and axially stretching, extension make this plasticizing pipe attenuation thereafter.
As what said, Fig. 6 represent to outgas functional relation of stroke (is unit with the millimeter) and time (second) of axle of pump.
As can be seen corresponding to time t
1The time piston impact very rapid, and at t
1To t
2Keep operation in time, and at t
2The time turn back to starting point suddenly, at t
2To t
3Inoperation in time is then at t
3To t
4Operate again, so circulation.
Fig. 7 a, 7b, 7c, 7d describes extrusion screw rod, and wherein position E is the material Lead-In Area, and the PVC powder mixes with stabilizing agent and lubrication prescription (not having plasticizer).In order to guarantee that raw material enters and prevents overheated and heat damage along screw rod in accordance with regulations, below two notions be very important:
-utilize the co-operating between feed worm and the extrusion screw rod, raw material is given first compression at feed zone, to guarantee material heat conductivity is preferably arranged.
-carry out heat insulation at first position of extrusion screw rod interior oil circulation, to prevent that material from occurring as above-cited bonding phenomenon, reduction of speed and fluctuation.Insert cutout ring 3(near the end in homogenize district and consult Fig. 8), have calibration hole 4 and 5, can hinder plastics along the extrusion screw rod proper flow, force it to plastify and need not to improve temperature.This has just improved the condition of work of plastifying material greatly, and particularly for PVC-U, rising is very responsive and can plastifies at an easy rate under low relatively temperature to temperature for it.The screw rod end is tip 6(Fig. 9) have one before cutout ring 6a.(have filter 7 with arm-tie, see Figure 10) make the material of plasticizing fully and fully homogenize pass the opening 9 that pipe 8 arrives the blowing head of tool circular cross-section, and come out with the form of moulding pipe along circumference 10, the thickness of moulding pipe is through after radially blowing and its axial tension, and thickness reduces gradually.
According to the present invention, in order to change the degree of giving pressure, the operation screw rod 12 that can make extruder keeps constant lower angular speed and changes feed worm 20(Fig. 2) angular speed.Utilize this method, be easy to change and give the pressure degree, be suitable for raw material of different nature (as the K value according to resin changes additive etc.).
Below will narrate and compress the effect that the hard PVC powder is had earlier.The hard PVC powder decomposes and isolates hydrochloric acid, autoxidisable substance and net.The raw meal of hard PVC, or more particularly, the dry mixture of hard PVC, be a kind of very soft material, have very poor heat conductivity, this just means, if with the peripheral heating of first in one's duty powder of extruder barrel, this heat is not easy to pass to the center of material; Therefore, if the temperature of feed zone is enough high, thermal decomposition will take place in (being on the hot spot) around the material.
But, if according to the present invention, earlier the hard PVC raw meal is given first compression, promptly between the Lead-In Area E of feed worm 20 and extrusion screw rod 12, give first compression, consult Fig. 1, the coefficient of heat conduction of PVC raw meal significantly increases, because material becomes tightr, make the heat energy that is sent to around the material pass to the inside of described material easily, and do not have the danger of any destruction.
Though extruder adopted feed worm when other patents and same know-how document had been carried the use powder, but generally speaking, employed device is not used first contraction principle, promptly utilize the angular speed of feed worm to be higher than the angular speed of extruder screw, therefore according to the present invention, they only play simple proportioner.
Another crucial characteristics of the present invention relate to the heat insulation of operation screw rod 12 inside among the machine barrel first district E, and are the same important with compression charging earlier.Refuel by swivel joint, make operation screw rod inside that certain oil mass circulation be arranged, swivel joint is regulated by an external control unit.The oil temperature should be lower than the temperature of material to be processed, so that remaining heat is removed.
This effect is to be used for preventing heat damage, under the uninsulated situation in first position of screw rod, give the resistance heated that is adopted on the machine barrel when powder that compresses earlier contacts with screw surface, this screw rod has lower temperature, can make powder bonded and the deceleration phenomenon takes place, can cause unexpected deceleration, and then cause the program of advancing that to control material to be processed, cause significant pressure vibration at the screw rod end, the outlet of blowing head unacceptable mass flow occurs and changes.
Adopt insulation in the screw feed district, can prevent the phenomenon that bonds, guarantee the balance of the most normal and expressing technique of charging.
Consider aforesaid situation, principle of the present invention is managed E(Fig. 1 in the district) end given the powder of compression earlier, so just can again powder be heated straight sufficiently high temperature, and in the phenomenon that continues not have when transporting deceleration forward, so can obtain good melting condition and can pass through positioning chamber easily, in the good plasticizing condition of the terminal acquisition of screw rod, therefore can increase flow and reduce cost, obtain product high-quality, high yield.
Arm-tie as shown in figure 10, is the arm-tie that is called " radiation " type, is unsuitable for the performance that arm-tie has better distribution material of extruding of hard PVC powder than known " heart " " spirality " and other.
Can point out, according to the importance of arm-tie of the present invention be contained in blow moulding machine in front the filter of face just in time be facing to outlet before transporting.Other foreign material in the solution can be filtered totally, change the filter guiding principle easily and do not need to dismantle extruder head.
Like this, this extrusion molding just might obtain the hard PVC film (main) of high yield and need not to adopt plasticizer, has extremely thin thickness simultaneously, and this is to rely on due to following each factor well balanced.
-powder raw material is by feed worm 20 and Lead-In Area E extrusion screw rod 12(Fig. 1) the compression earlier of giving of co-operating import.
The insulation of E is promptly distinguished in the insulation of a part of interior oil circulation of-extrusion screw rod 12, has prevented bonding and reduction of speed, so can guarantee good operating condition.
-at a high speed compress extrusion screw rod, be specially designed according to above-mentioned condition, guaranteed the requirement of compression, melting, the degassing and each condition of homogenize and need not the PVC material is adopted thermal stress.
The blowing head of-one radial pattern as described, can be extruded extremely thin hard PVC film, and (promptly since 15 microns) also make extruder have very high output.
-replaceable filter is easy to change screen pack and need not to dismantle extruder head.
Claims (3)
1, plastic sheeting is extruded the method with blowing continuously, particularly is applicable to the PVC-U powder, and need not to use plasticizer.Film can be used for packaging for foodstuff.It is characterized in that with the co-operating between the operation screw rod (12) of feed worm (20) and extruder raw material cold compression in advance.For above-mentioned purpose, described screw rod (20) has variable and controllable angular speed, and the angular speed of the constant as far as possible operation screw rod (12) that is higher than described extruder.Described raw material is to enter district E at first of extruder to compress in advance, operation screw rod among the district E is heat-insulating, promptly be equipped with heat-insulating device and in described district, have any impact, and can from processed material, shift out heat to prevent signs of degradation in each district afterwards with the fluid that prevents described screw rod inner loop.Described extruder comprises two parts or two intervals, is to be kept apart by calibration mouthful (4,5), first district (K1) that the heat insulation of carrying above described first interval comprises enters district (E), heat because of compression and first part of heating plasticizing district (H); Second interval comprises; The residue in heating plasticizing district (H) partly; Add pyrolysis zone (D), heat de-airing district (G), the second heating compressional zone (K2) and a material heating discharge area (A), described screw rod end has a blowing head that has filter, and this filter is easy to replacing and need not to require the described blowing head of dismounting.
2, according to the device of enforcement this law of claim 1.It is characterized in that this device comprises: a feed hopper (16), raw material enters first district (E) of screw rod (12) thus, screw rod (12) links to each other with feed worm (20), and screw rod (20) has the controllable high angular speed of operation screw rod (12) than extruder; The 1st of described screw rod (12) partly is heat-insulating, promptly be equipped with heat-insulating device and have any impact in this district, and can from processed material, shift out heat to prevent signs of degradation in each district afterwards with the fluid that prevents described screw rod inner loop.Described extruder comprises two positions, by calibration mouth (4,5) keep apart, first position comprises that described heat insulation enters the contract some of district (K1) and heating plasticizing district (H) of district (E), first thermal treatment zone, and the residue that second position comprises heating plasticizing district (H) partly; Pyrolysis zone (D); Heat de-airing district (G); The second heating compressional zone (K2) and material heating discharge area (A), and the screw rod end has a blowing head that has a filter, this filter are easy to change and need not to require to dismantle described blowing head.
3, according to the device of claim 2, it is characterized in that the circulation of screw rod (12) internal flow, the swivel joint of flowing through, utilize the external control unit as far as possible stably controlling its amount and temperature, respectively distinguish processed material generation signs of degradation to prevent the screw rod after first district, the hot fluid that adds for the circulation of first district is heat-insulating, so can prevent the bonding and the deceleration of material, avoids unacceptable changes in flow rate taking place and having destroyed normally carrying out of this law in the outlet of blowing head.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH5818/84-0 | 1984-12-06 | ||
| CH5818/84A CH661001A5 (en) | 1984-12-06 | 1984-12-06 | Process and apparatus for the continuous blow extrusion of thin plastic films from "rigid" PVC powder, even without the use of plasticizers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85101859A true CN85101859A (en) | 1987-01-17 |
| CN1005621B CN1005621B (en) | 1989-11-01 |
Family
ID=4299806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85101859.9A Expired CN1005621B (en) | 1984-12-06 | 1985-04-01 | Method and apparatus for the continuous extrusion and blowing of thin films of plastic material, in particular from "rigid" pvc power |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN1005621B (en) |
| CH (1) | CH661001A5 (en) |
| IT (1) | IT1181599B (en) |
| SU (1) | SU1500147A3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111009353A (en) * | 2019-12-31 | 2020-04-14 | 杭州电缆股份有限公司 | B1-grade flame-retardant power cable and production process thereof |
-
1984
- 1984-12-06 CH CH5818/84A patent/CH661001A5/en not_active IP Right Cessation
-
1985
- 1985-03-13 IT IT47804/85A patent/IT1181599B/en active
- 1985-04-01 CN CN85101859.9A patent/CN1005621B/en not_active Expired
- 1985-12-05 SU SU3981459A patent/SU1500147A3/en active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111009353A (en) * | 2019-12-31 | 2020-04-14 | 杭州电缆股份有限公司 | B1-grade flame-retardant power cable and production process thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1005621B (en) | 1989-11-01 |
| SU1500147A3 (en) | 1989-08-07 |
| CH661001A5 (en) | 1987-06-30 |
| IT1181599B (en) | 1987-09-30 |
| IT8547804A0 (en) | 1985-03-13 |
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