CN103085251B - Device and method for extrusion casting, and biaxial tensile system and method for plastic film - Google Patents
Device and method for extrusion casting, and biaxial tensile system and method for plastic film Download PDFInfo
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- CN103085251B CN103085251B CN201110342222.8A CN201110342222A CN103085251B CN 103085251 B CN103085251 B CN 103085251B CN 201110342222 A CN201110342222 A CN 201110342222A CN 103085251 B CN103085251 B CN 103085251B
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Abstract
The invention discloses a device and a method for extrusion casting, and a biaxial tensile system and method for a plastic film. The extrusion casting device (10) comprises a sheet headpiece (11), an air knife (12), a casting roller (13) and a cooling water bath (14). The sheet headpiece provides a molten sheet (20) to the surface of the casting roller; the air knife enables the molten sheet to attach to the surface of the casting roller; the cooling water bath contains a coolant liquid; part of the casting roller is immersed in the coolant liquid; and a part of the casting roller and between the air knife and the coolant liquid level is provided with a leveling device (15). The leveling device can flatten the edge part of a sheet material, so as to form the sheet material into a flat sheet and avoid wrinkling and problems caused by wrinkling.
Description
Technical field
The present invention relates to the preparation of plastic sheeting, particularly, relate to extrusion flow rolling equipment and extruding casting method, and plastic sheeting bidirectional stretching system and plastic sheeting bidirectional extending method.
Background technology
In prior art, usually use extrusion flow rolling equipment to extrude casting method machine-shaping plastic sheet.Wherein, extrusion flow rolling equipment comprises side fall roof caving, air knife, casting roller and cooling water bath cabinet, side fall roof caving provides the sheet material of melting to the roll surface of casting roller, air knife makes the sheet material of melting attach to the roll surface of casting roller by high pressure draught, cooling water bath cabinet content has received cooling fluid, and a part for casting roller immerses described cooling fluid.Particularly, in forming process, plastic raw materials melt extrudes by the slit membrana oralis of side fall roof caving.Then the roll surface that the high pressure draught that air knife provides makes the sheet material of melting be attached at casting roller carries out shaping.Sheet material rolls with casting roller then, and carries out quenching sizing by the casting roller of low temperature and cooling fluid (such as water) to plastic sheet.
But in actual production process, plastic sheet is due to the difference of the upper and lower surface cool speed of sheet material when quenching is shaped, and the more high reason of plastic raw materials percent thermal shrinkage, cause sheet material easily warpage to occur, namely the flatness of sheet edge is poor.Particularly for the curtain coating sheet of crystalline plastic raw material or intensity strengthening agent modified plastics raw material, because rigidity is large, percent thermal shrinkage is high, fold, the warpage of sheet edge are more remarkable.On the one hand, irregular sheet edge reduce follow-up wind-up operation stability and and reduce the flatness of the material volume that rolling obtains, thus must cut sheet edge, thus create a large amount of edge waste materials.On the other hand, for the production of bidirectional stretching plastic film, sheet thickness shaping in extruding curtain coating operation is larger, the warpage degree of sheet edge is strengthened, thus in the warm of follow-up longitudinal stretching, cause sheet edge and preheat roll to attach not good, the pre-thermal efficiency of sheet edge declines, preheating is insufficient, and the situation of uneven pulling easily appears in film.In addition, the warpage of sheet edge can scratch the rubber nip roll that longitudinal stretching uses, and shortens the nip rolls life-span, reduces the equipment continuous cycle of operation.
In addition, the warpage that sheet edge is larger reduces the firmness of stretching clamp to sheet clamping when cross directional stretch, make during film stretching, easily to occur de-situation such as folder (disengaging fixture), rupture of membranes etc., have impact on the speed of service of production line and carrying out smoothly of membrane production.
Summary of the invention
The object of this invention is to provide a kind of extrusion flow rolling equipment and the extruding casting method that can avoid or reduce sheet edge fold, and can avoid or reduce plastic sheeting bidirectional stretching system and the plastic sheeting bidirectional extending method of sheet edge fold.
To achieve these goals, the invention provides a kind of extrusion flow rolling equipment, this extrusion flow rolling equipment comprises side fall roof caving, air knife, casting roller and cooling water bath cabinet, described side fall roof caving provides the sheet material of melting to the roll surface of described casting roller, described air knife makes the sheet material of described melting attach to the roll surface of described casting roller, described cooling water bath cabinet content has received cooling fluid, a part for described casting roller immerses described cooling fluid, wherein, the part between described air knife and the liquid level of described cooling fluid of described casting roller is provided with flattening device.
Preferably, described flattening device comprises and is tightly attached to edge roller on described casting roller for pressing sheet material to make described sheet material.
Preferably, described edge roller is made up of soft, exotic material.
Preferably, described flattening device comprises force application mechanism and connecting plate, and described edge roller is connected to described connecting plate, and described force application mechanism is connected to described connecting plate with to described edge roller output pressure.
Preferably, described edge roller is multiple, each edge roller can pivotable and be removably connected to described connecting plate by link, thus multiple edge roller can press described sheet material along the circumference of described casting roller in predetermined angular range, and described predetermined angle is 10 ~ 20 °.
Preferably, described flattening device comprises the controller and pressure feedback sensor that are electrically connected to each other, the pressure that described controller exports for controlling described force application mechanism, described pressure feedback sensor is for sensing described edge roller applied pressure and to described controller feedback sense signal.
Preferably, described flattening device is arranged on the both sides of the edge of described casting roller, with the edge of smooth described sheet material.
The present invention also provides a kind of extruding casting method, and the method comprises: (a), the sheet material of melting is expressed to the roll surface of casting roller; (b), make the sheet material extruded be attached at the roll surface of described casting roller by air knife, to form sheet material; C (), applying pressure to described sheet material, with the roll surface making described sheet material entirely be attached at described casting roller; (d), described sheet material is moved and by cooling fluid with described casting roller, with sheet material described in cooling and shaping.
Preferably, in step (c), along the circumference of described roll surface, in predetermined angular range, apply pressure to described sheet material, described predetermined angle is 10 ~ 20 °.
Preferably, in step (c), pressure is applied to the edge of described sheet material, is no more than 5mm with the amount of warpage at the edge making described sheet material.
The present invention also provides a kind of plastic sheeting bidirectional stretching system, and this system comprises the extrusion flow rolling equipment, longitudinal stretching equipment and the transverse stretching equipment that connect successively, and wherein, described extrusion flow rolling equipment is extrusion flow rolling equipment of the present invention.
Preferably, described longitudinal stretching equipment comprises multiple preheat roll and multiple draw roll, and the arranged outside of preheat roll has for the assisted heating device to this edge heating of preheat roll at least partially at least partially.
Preferably, described assisted heating device is non-contact thermal device.
Preferably, the heating-up temperature of described assisted heating device is the heating-up temperature of described preheat roll.
Preferably, described transverse stretching equipment comprises stretching clamp and is arranged on the tension mechanism for providing tension force to described sheet material between described longitudinal stretching equipment and described stretching clamp.
Preferably, described tension mechanism comprises two supports and is arranged on two pairs of tension force nip rolls on these two supports respectively, and described sheet material passes through between described two supports, and often pair of tension force nip rolls lays respectively at the upper side and lower side of a lateral edges of described sheet material.
The present invention also provides a kind of plastic sheeting bidirectional extending method, and the method comprises extruding casting step, longitudinal stretching step and transverse stretching step, and wherein, described extruding casting step is extruding casting method of the present invention.
Preferably, described longitudinal stretching step comprises: (a '), by attaching on preheat roll by the sheet material of sizing, sheet material described in preheating; The length of (b '), the described sheet material that to be stretched by draw roll; Wherein, in step (a '), described method also comprises provides auxiliary heating to the edge of described sheet material.
Preferably, described auxiliary heating is non-contact thermal.
Preferably, the heating-up temperature of described auxiliary heating is the heating-up temperature of described preheat roll.
Preferably, described transverse stretching step comprises: (i), to after longitudinal stretching sheet material apply tension force, with sheet material described in lateral tension; (ii), the sheet material of tensioning is transported in stretching clamp, with the width of the described sheet material that stretches.
Preferably, in step (i), clamped the both sides of the edge of described sheet material by clips rod to apply light pressure and sheet material described in tensioning.
By technique scheme, flattening device can the edge of flat sheets material, makes sheet material be fixed to smooth sheet material, the problem avoided fold and cause because of fold.
Other features and advantages of the present invention are described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for description, is used from explanation the present invention, but is not construed as limiting the invention with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 is the structural representation of a kind of embodiment that extrusion flow rolling equipment of the present invention is described;
Fig. 2 is the structural representation of the flattening device of key diagram 1;
Fig. 3 is the structural representation of the regulating system that flattening device of the present invention is described;
Fig. 4 is the structural representation of a kind of embodiment that plastic sheeting bidirectional stretching system of the present invention is described.
Description of reference numerals
10: extrusion flow rolling equipment
11: side fall roof caving 12: air knife 13: casting roller 14: cooling water bath cabinet
15: flattening device
15a: controller 15b: pressure feedback sensor 15c: pressure regulator
16: edge roller 17: force application mechanism 18: connecting plate 19: link
20: sheet material
30: longitudinal stretching equipment 31: preheat roll 32: draw roll 33: assisted heating device
40: transverse stretching equipment 41: stretching clamp 42: tension mechanism
43: support 44: tension force nip rolls 45: bracing frame
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
In the present invention, when not doing contrary explanation, the noun of locality such as " upper and lower, left and right " of use typically refers to reference to upper and lower, left and right shown in the drawings; " inside and outside " refers to profile inside and outside relative to each parts itself.
According to an aspect of the present invention, a kind of extrusion flow rolling equipment is provided, this extrusion flow rolling equipment 10 comprises side fall roof caving 11, air knife 12, casting roller 13 and cooling water bath cabinet 14, described side fall roof caving 11 provides the sheet material 20 of melting to the roll surface of described casting roller 13, described air knife 12 makes the sheet material 20 of described melting attach to the roll surface of described casting roller 13, cooling fluid is accommodated in described cooling water bath cabinet 13, a part for described casting roller 13 immerses described cooling fluid, wherein, the part between described air knife 12 and the liquid level of described cooling fluid of described casting roller 13 is provided with flattening device 15.
As shown in Figure 1, by arranging flattening device 15 between air knife 12 and the liquid level of cooling fluid, smooth effect can be applied to sheet material 20 in the forming process of sheet material 20, make sheet material 20 before entering cooling fluid, be shaped to more smooth shape, thus finally can obtain comparatively smooth effect after cooling fluid cooling and shaping.
Wherein, flattening device 15 can be the various devices being suitable for applying sheet material 20 smooth effect.In a preferred embodiment of the invention, as shown in Figure 2, described flattening device 15 comprises and is tightly attached to edge roller 16 on described casting roller 13 for pressing sheet material 20 to make described sheet material 20.
Because flattening device 15 is arranged on the position between blower fan 12 and cooling liquid level, sheet material 20 is still in the state of flexibility, high temperature at this place, therefore described edge roller 16 should be made up of soft, exotic material, such as, can make edge roller 16 by materials such as aluminium, copper, silicon rubber, nylon resin, polyflon, polyimide resin, polyether-ether-ketone resins.In addition, edge roller 16 should have higher surface smoothness, to avoid the surface quality scratching casting roller 12 or affect sheet material 20.
It will be appreciated by those skilled in the art that, the flattening device 15 of various structure can be adopted, with to edge roller 16 output pressure, thus by edge roller 16 flat sheets 20.Preferably, as shown in Figure 2, described flattening device 15 can comprise force application mechanism 17 and connecting plate 18, and described edge roller 16 is connected to described connecting plate 18, and described force application mechanism 17 is connected to described connecting plate 18 with to described edge roller 16 output pressure.Wherein, force application mechanism 17 can adopt various suitable structure, such as, can be press rods (connecting rod comprising spring and be connected with spring), to export adjustable pressure to edge roller 16.In addition, the source pressure of force application mechanism 17 can be selected as required, such as, can be hydraulic pressure, air pressure, mechanical pressure, electromagnetic force etc.
In addition, preferably, as depicted in figs. 1 and 2, described edge roller 16 can be multiple, each edge roller 16 can pivotable and be removably connected to described connecting plate 18 by link 19, thus multiple edge roller 16 can press described sheet material 20 along the circumference of described casting roller 13 in predetermined angular range, described predetermined angle is 10 ~ 20 °.By this layout, multiple edge roller 16 can apply pressure to sheet material 20 on the subregion of the circumference of the roll surface of casting roller 13, thus implements smooth to sheet material 20 in scope larger in the forming process (namely through air knife 12 to the process entered between cooling fluid) of sheet material 20.Wherein, the number of predetermined angle, edge roller 16 and spacing each other can be selected according to the specification of required planarization effects and sheet material 20.Particularly, when sheet material 20 is thicker or rigidity is larger, suitably can increase the quantity of edge roller 16 to strengthen planarization effects.
In addition, can whether ideal adjusts edge roller 16 applied pressure according to planarization effects.Preferably, described flattening device 15 can comprise the controller 15a and pressure feedback sensor 15b that are electrically connected to each other, the pressure that described controller 15a exports for controlling described force application mechanism 17, described pressure feedback sensor 15b is for sensing described edge roller 16 applied pressure and to described controller 15a feedback sense signal.By this layout, not only can control the pressure (namely controlling the pressure of edge roller 16) that force application mechanism 17 exports, edge roller 16 reality can also be monitored to the pressure of sheet material 20.Wherein, controller 15a can regulate force application mechanism 17 to export pressure by suitable pressure regulator 15c, wherein pressure regulator 15c is electrically connected with controller 15a.
Extruding in casting processes, the warpage of sheet material 20 mainly appears at the edge of sheet material 20.Therefore, in a preferred embodiment of the invention, described flattening device 15 only can be arranged on the both sides of the edge of described casting roller 13, with the edge of smooth described sheet material 20.Particularly, a flattening device 15 is provided with separately in the both sides of the edge of casting roller 13.By this layout, can structure be simplified on the one hand, on the other hand can be smooth and energy-conservation because carrying out local.In this case, according to the sheet material 20 of different size, material, the pressure that force application mechanism 17 exports is preferably 0.01 ~ 5MPa.
According to a further aspect in the invention, provide a kind of extruding casting method, the method comprises:
(a), the sheet material of melting is expressed to the roll surface of casting roller 13;
(b), make the sheet material extruded be attached at the roll surface of described casting roller 13 by air knife 12, to form sheet material 20;
C (), applying pressure to described sheet material 20, with the roll surface making described sheet material 20 entirely be attached at described casting roller 13;
(d), described sheet material 20 is moved and by cooling fluid with described casting roller 13, with sheet material described in cooling and shaping 20.
By applying smooth effect to sheet material 20 between air knife 12 and the liquid level of cooling fluid, make sheet material 20 before entering cooling fluid, be shaped to more smooth shape, thus finally can obtain comparatively smooth effect after cooling fluid cooling and shaping.
Wherein, the applying pressure of flattening device of the present invention 15 pairs of sheet materials 20 can be used, with the roll surface making sheet material 20 entirely be attached at casting roller 13.
Preferably, in step (c), along the circumference of described roll surface, in predetermined angular range, can apply pressure to described sheet material 20, described predetermined angle is 10 ~ 20 °.By the subregion of the circumference of the roll surface at casting roller 13 applies pressure to sheet material 20, can implement smooth to sheet material 20 in scope larger in the forming process of sheet material 20 (namely through air knife 12 to the process entered between cooling fluid).Wherein, predetermined angle and applied pressure can be selected according to the specification of required planarization effects and sheet material 20.Particularly, when sheet material 20 is thicker or rigidity is larger, suitably can increase predetermined angle and pressure to strengthen planarization effects.
Extruding in casting processes, the warpage of sheet material 20 mainly appears at the edge of sheet material 20.Therefore, in a preferred embodiment of the invention, in step (c), only can apply pressure to the edge of described sheet material 20, be no more than 5mm with the amount of warpage at the edge making described sheet material 20.In this case, according to the sheet material 20 of different size, material, the pressure that force application mechanism 17 exports is preferably 0.01 ~ 5MPa.
According to a further aspect in the invention, a kind of plastic sheeting bidirectional stretching system is provided, this system comprises the extrusion flow rolling equipment 10, longitudinal stretching equipment 30 and the transverse stretching equipment 40 that connect successively, and wherein, described extrusion flow rolling equipment 10 is extrusion flow rolling equipment of the present invention.
By extrusion flow rolling equipment 10 of the present invention, can avoid or reduce fold and obtain the smooth sheet material 20 of sizing, be conducive to carrying out longitudinal stretching and cross directional stretch subsequently through longitudinal stretching equipment 30 and transverse stretching equipment 40, the second best in quality plastic sheeting of final acquisition.
Preferably, as shown in Figure 4, described longitudinal stretching equipment 30 can comprise multiple preheat roll 31 and multiple draw roll 32, and the outside of preheat roll 31 can be provided with for the assisted heating device 33 to this edge heating of preheat roll 31 at least partially at least partially.The sheet material 20 obtained by extruding curtain coating attaches to preheating on preheat roll 31 then, then by draw roll 32 longitudinal stretching.But the edge of sheet material 20 possibly cannot just attach to preheat roll 31, makes the edge of sheet material 20 not by preheat roll 31 preheating, affects follow-up longitudinal stretching.The assisted heating device 33 arranged by present embodiment, can provide extra pre-heat effect to the edge of sheet material 20, is able to preheating to guarantee to fail the marginal portion attached on preheat roll 31.
For ensureing the normal movement of sheet material 20, described assisted heating device 33 is preferably non-contact thermal device, such as, can be far infrared heater, hot air heating apparatus or radiant heating device etc.
The preheat temperature of the heating-up temperature that assisted heating device 33 provides and preheat roll 31 is suitable.According to specification and the kind of manufactured plastic sheeting, the preheat temperature of preheat roll 31 is different.Therefore, the heating-up temperature of described assisted heating device 33 can be correspondingly made to be 30 ~ 350 DEG C.
In a preferred embodiment of the invention, as shown in Figure 4, described cross directional stretch 40 equipment can comprise stretching clamp 41 and be arranged on the tension mechanism 42 for providing tension force to described sheet material 20 between described longitudinal stretching equipment 30 and described stretching clamp 41.Wherein, can import in stretching clamp 41 through the sheet material 20 of longitudinal stretching and carry out cross directional stretch.By arranging tension mechanism 42 between longitudinal stretching equipment 30 and stretching clamp 41, horizontal tension force can be applied to sheet material 20 before sheet material 20 is imported stretching clamp 41, to guarantee that sheet material 20 enters stretching clamp 41 with smooth form, prevent from pressing from both sides because sheet material 20 out-of-flatness causes taking off during cross directional stretch.
Wherein, tension mechanism 42 can be various suitable structures, as long as can apply horizontal tension to sheet material 20, makes sheet material 20 enter stretching clamp 41 with smooth form.In a preferred embodiment of the invention, as shown in Figure 4, described tension mechanism 42 can comprise two supports 43 and be arranged on two pairs of tension force nip rolls 44 on these two supports 43 respectively, described sheet material 20 passes through between described two supports 43, and often pair of tension force nip rolls 44 lays respectively at the upper side and lower side of a lateral edges of described sheet material 20.In the preferred embodiment, apply light pressure by the edge of clips rod 44 pairs of sheet materials 20, get final product lateral tension sheet material 20, make sheet material 20 enter stretching clamp 41 with smooth form.Wherein, the light pressure that the edge of clips rod 44 pairs of sheet materials 20 applies can be selected according to actual conditions, as long as can play tension.According to different size, the material of produced plastic sheeting, the light pressure that the edge of clips rod 44 pairs of sheet materials 20 applies can be 0.5 ~ 1.5MPa.Particularly, as shown in Figure 4, clips rod 44 can be installed by bracing frame 45 and be supported in support 43.
According to a further aspect in the invention, provide a kind of plastic sheeting bidirectional extending method, the method comprises extruding casting step, longitudinal stretching step and transverse stretching step, and wherein, described extruding casting step is extruding casting method of the present invention.
By extruding casting method of the present invention, can avoid or reduce fold and obtain the smooth sheet material 20 of sizing, being conducive to the follow-up longitudinal stretching step that carries out and transverse stretching step, finally obtaining the second best in quality plastic sheeting.
Described longitudinal stretching step can comprise: (a '), by attaching on preheat roll 31 by the sheet material 20 of sizing, sheet material 20 described in preheating; The length of (b '), the described sheet material 20 that to be stretched by draw roll 32.Wherein, in step (a '), described method can also comprise provides auxiliary heating to the edge of described sheet material 20.
The sheet material 20 obtained by extruding curtain coating attaches to preheating on preheat roll 31 then, then by draw roll 32 longitudinal stretching.But the edge of sheet material 20 possibly cannot just attach to preheat roll 31, makes the edge of sheet material 20 not by preheat roll 31 preheating, affects follow-up longitudinal stretching.By providing auxiliary heating to the edge of described sheet material 20, can guarantee to fail the marginal portion attached on preheat roll 31 is also able to preheating.
For ensureing the normal movement of sheet material 20, auxiliary heating is preferably non-contact thermal device, such as, can be Far-infrared Heating, Hot-blast Heating or radiation heating etc.
The preheat temperature of the heating-up temperature that auxiliary heating provides and preheat roll 31 is suitable.According to specification and the kind of manufactured plastic sheeting, the preheat temperature of preheat roll 31 is different.Therefore, the heating-up temperature of described assisted heating device can be correspondingly made to be 30 ~ 350 DEG C.
In addition, described transverse stretching step can comprise: (i), apply tension force, with sheet material described in lateral tension 20 to the sheet material 20 after longitudinal stretching; (ii), the sheet material 20 of tensioning is transported in stretching clamp 41, with the width of the described sheet material 20 that stretches.
Wherein, can import in stretching clamp 41 through the sheet material 20 of longitudinal stretching and carry out cross directional stretch.By applying tension force to the sheet material 20 after longitudinal stretching after longitudinal stretching and before entering stretching clamp 41, can guarantee that sheet material 20 enters stretching clamp 41 with smooth form, preventing from pressing from both sides because sheet material 20 out-of-flatness causes taking off during cross directional stretch.
Particularly, the both sides of the edge of described sheet material 20 can be clamped to apply to ask pressure and sheet material 20 described in tensioning by clips rod 44.In this way, use the edge of clips rod 44 pairs of sheet materials 20 to apply light pressure, get final product lateral tension sheet material 20, make sheet material 20 enter stretching clamp 41 with smooth form.
In addition, well known to a person skilled in the art, when carrying out cross directional stretch, also can carry out preheating as required, not elaborating at this.
Plastic sheeting bidirectional stretching system of the present invention and method may be used for preparing various plastic sheeting, thermoplastic macromolecule material and the combinations thereof such as such as polypropylene (PP), polyethylene (PE), nylon (PA), PLA (PLA), polyvinyl chloride (PVC), polystyrene (PS), PETG (PET), polybutylene terephthalate (PBT) (PBT), and thermoset macromolecule material and the combination thereof such as polyurethane (PU).
Below by specific embodiment, advantage of the present invention is described.
Embodiment 1
Plastic sheeting bidirectional extending method of the present invention is used to prepare polyacrylic film, raw material is for adding intensity strengthening agent (Petropols, addition is 25%) acrylic resin, production equipment is the biaxially oriented film tinuous production of German Bruckner (Br ü ckner) company.Extrusion temperature is 230 DEG C, and the temperature of casting roller 13 is 30 DEG C, and the thickness of the sheet material that extruding curtain coating obtains is 1mm, and final acquisition thickness is the film of 20 μm.
Wherein, flattening device 15 of the present invention is set separately in the both sides of the edge of casting roller 13.Flattening device 15 comprises 4 edge roller 16, with the predetermined angular of 15 of the circumference along casting roller 13 °, the edge of sheet material 20 is applied to the pressure of 3MPa.
The preheat temperature of production line longitudinal stretching is 115 DEG C, and draft temperature is 90 DEG C, and stretching ratio is 5 times; The preheat temperature of cross directional stretch is 171 DEG C, and draft temperature is 165 DEG C, and stretching ratio is 10 times; Film take-up speed is 380m/min.
Embodiment 2
The method of embodiment 1 is adopted to prepare polyacrylic film.
Difference is, described plastic sheeting bidirectional stretching system also comprises assisted heating device 33 of the present invention and tension mechanism 42.Wherein, the heating-up temperature of assisted heating device 33 is 115 DEG C, and the light pressure that jockey pulley 44 applies is 0.5MPa.
Comparative example 1
The method of embodiment 1 is adopted to prepare polyacrylic film.
Difference is, existing film stretching production line does not arrange any one in flattening device 15 of the present invention, assisted heating device 33 and tension mechanism 42.
Performance evaluation
Carry out performance evaluation to the intermediate product obtained by embodiment 1,2 and comparative example 1 and end product, result is as shown in table 1.Wherein, intermediate product is the sheet material 20 that extruding curtain coating obtains, and its performance comprises the maximum amount of warpage of the edge of sheet material 20; End product is film product, and its performance comprises film TD direction fracture strength, Film Haze, film glossiness, and film cutting edge amount, the continuous seepage rupture of membranes frequency in film manufacturing processes.Wherein, the maximum amount of warpage of sheet material is the maximum of warped portion relative to the difference in height of smooth part.Film cutting edge amount is the fabric width of drawing and forming film and the difference of the film product fabric width finally obtained, and the part of cutting edge is underproof film.In addition, thin film mechanical performance test, according to the method for GB/T1040.3-2006, uses the Z020 type cupping machine of German Zwick company to test; Film Haze test, according to the method for GB/T2410, uses the A-4725 type transmission mist shadow analyzer of German BYK company to test; The test of film glossiness, according to the method for ASTMD2457-08, uses the A-4454 type glossiness tester of German BYK company to test.
From the test result of table 1, have employed the comparative example 1 that the embodiment 1 of planarization system of the present invention and embodiment 2 do not adopt planarization system of the present invention, the sheet material edge warpage of embodiment 1,2 is eliminated, thin film mechanical performance is better, the optical property such as Film Haze, glossiness is better, film article cutting edge amount is less, and film quantity-produced stability is higher.
Table 1 embodiment 1,2 and comparative example 1 result
| Performance parameter | Embodiment 1 | Embodiment 2 | Comparative example 1 |
| Maximum amount of warpage/the mm of sheet material | 0 | 0 | 7 |
| Film TD fracture strength/MPa | 305 | 313 | 280 |
| Film Haze/% | 1.1 | 1.0 | 1.9 |
| Film glossiness | 90 | 93 | 85.5 |
| Film cutting edge amount/mm | 50 | 50 | 70 |
| 48 hours continuous seepage rupture of membranes number of times | 0 | 0 | 3 |
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible combination.
In addition, also can be combined between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (17)
1. an extrusion flow rolling equipment, this extrusion flow rolling equipment (10) comprises side fall roof caving (11), air knife (12), casting roller (13) and cooling water bath cabinet (14), described side fall roof caving (11) provides the sheet material (20) of melting to the roll surface of described casting roller (13), described air knife (12) makes the sheet material of described melting (20) attach to the roll surface of described casting roller (13), cooling fluid is accommodated in described cooling water bath cabinet (14), a part for described casting roller (13) immerses described cooling fluid, it is characterized in that, the part be positioned between described air knife (12) and the liquid level of described cooling fluid of described casting roller (13) is provided with flattening device (15), described flattening device (15) comprises and is tightly attached to edge roller (16) on described casting roller (13) for pressing sheet material (20) to make described sheet material (20), described flattening device (15) comprises force application mechanism (17) and connecting plate (18), described edge roller (16) is connected to described connecting plate (18), described force application mechanism (17) is connected to described connecting plate (18) with to described edge roller (16) output pressure, described edge roller (16) is for multiple, each edge roller (16) can pivotable and be removably connected to described connecting plate (18) by link (19), thus multiple edge roller (16) can press described sheet material (20) along the circumference of described casting roller (13) in predetermined angular range, described predetermined angle is 10 ~ 20 °, described flattening device (15) comprises the controller (15a) and pressure feedback sensor (15b) that are electrically connected to each other, the pressure that described controller (15a) exports for controlling described force application mechanism (17), described pressure feedback sensor (15b) is for sensing described edge roller (16) applied pressure and to described controller (15a) feedback sense signal.
2. extrusion flow rolling equipment according to claim 1, wherein, described edge roller (16) is made up of soft, exotic material.
3. extrusion flow rolling equipment according to claim 1 and 2, wherein, described flattening device (15) is arranged on the both sides of the edge of described casting roller (13), with the edge of smooth described sheet material (20).
4. extrude a casting method, the method comprises:
(a), the sheet material of melting is expressed to the roll surface of casting roller (13);
(b), make the sheet material extruded be attached at the roll surface of described casting roller (13) by air knife (12), to form sheet material (20);
C (), applying pressure to described sheet material (20), with the roll surface making described sheet material (20) entirely be attached at described casting roller (13);
(d), make described sheet material (20) move with described casting roller (13) and pass through cooling fluid, with sheet material described in cooling and shaping (20);
Wherein, in step (c), along the circumference of described roll surface, in predetermined angular range, apply pressure to described sheet material (20), described predetermined angle is 10 ~ 20 °; The sensing signal fed back to described sheet material (20) applied pressure and according to described pressure feedback sensor (15b) by pressure feedback sensor (15b) sensing is controlled described sheet material (20) applied pressure.
5. extruding casting method according to claim 4, wherein, in step (c), applies pressure to the edge of described sheet material (20), is no more than 5mm with the amount of warpage at the edge making described sheet material (20).
6. a plastic sheeting bidirectional stretching system, this system comprises the extrusion flow rolling equipment (10), longitudinal stretching equipment (30) and the transverse stretching equipment (40) that connect successively, it is characterized in that, described extrusion flow rolling equipment (10) is for according to the extrusion flow rolling equipment in claim 1-3 described in any one.
7. plastic sheeting bidirectional stretching system according to claim 6, wherein, described longitudinal stretching equipment (30) comprises multiple preheat roll (31) and multiple draw roll (32), and the arranged outside of preheat roll (31) has for the assisted heating device (33) to this edge heating of preheat roll (31) at least partially at least partially.
8. plastic sheeting bidirectional stretching system according to claim 7, wherein, described assisted heating device (33) is non-contact thermal device.
9. the plastic sheeting bidirectional stretching system according to claim 7 or 8, wherein, the heating-up temperature of described assisted heating device (33) is the heating-up temperature of described preheat roll (31).
10. the plastic sheeting bidirectional stretching system according to claim 6 or 7, wherein, described transverse stretching equipment (40) comprises stretching clamp (41) and is arranged on the tension mechanism (42) for providing tension force to described sheet material (20) between described longitudinal stretching equipment (30) and described stretching clamp (41).
11. plastic sheeting bidirectional stretching systems according to claim 10, wherein, described tension mechanism (42) comprises two supports (43) and is arranged on two pairs of tension force nip rolls (44) on these two supports (43) respectively, described sheet material (20) passes through between described two supports (43), and often pair of tension force nip rolls (44) lays respectively at the upper side and lower side of a lateral edges of described sheet material (20).
12. 1 kinds of plastic sheeting bidirectional extending methods, the method comprises extruding casting step, longitudinal stretching step and transverse stretching step, and wherein, described extruding casting step is the method according to claim 4 or 5.
13. plastic sheeting bidirectional extending methods according to claim 12, wherein, described longitudinal stretching step comprises:
(a '), by the sheet material (20) of sizing is attached on preheat roll (31), sheet material described in preheating (20);
The length of (b '), described sheet material (20) that to be stretched by draw roll (32);
Wherein, in step (a '), described method also comprises provides auxiliary heating to the edge of described sheet material (20).
14. plastic sheeting bidirectional extending methods according to claim 13, wherein, described auxiliary heating is non-contact thermal.
15. plastic sheeting bidirectional extending methods according to claim 13 or 14, wherein, the heating-up temperature of described auxiliary heating is the heating-up temperature of described preheat roll (31).
16. plastic sheeting bidirectional extending methods according to claim 12 or 13, wherein, described transverse stretching step comprises:
(i), to after longitudinal stretching sheet material (20) apply tension force, with sheet material described in lateral tension (20);
(ii), the sheet material (20) of tensioning is transported in stretching clamp (41), with the width of described sheet material (20) that stretch.
17. plastic sheeting bidirectional extending methods according to claim 16, wherein, in step (i), clamped the both sides of the edge of described sheet material (20) by tension force nip rolls (44) to apply light pressure and sheet material (20) described in tensioning.
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| CN103446895B (en) * | 2013-08-19 | 2015-05-13 | 湖北龙飞翔实业集团有限公司 | Casting micro dip-coating continuous production equipment and method of ultrathin membrane polymer complex film |
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| CN107718818B (en) * | 2017-11-30 | 2023-08-22 | 杭州瑞健科技有限公司 | Single-layer plastic large card for rapid diagnosis and manufacturing method and equipment thereof |
| CN110877448B (en) * | 2018-09-05 | 2023-06-02 | 北京沐昱新能源科技有限公司 | Cast sheet system with three-dimensionally constrained polyethylene microporous membrane |
| CN109291348B (en) * | 2018-09-20 | 2021-01-29 | 江苏润华膜业科技有限公司 | Method for changing surface glossiness of film |
| CN109604259A (en) * | 2018-11-27 | 2019-04-12 | 广东新宇智能装备有限公司 | A kind of used roller air knife dedusting Fang Zhe mechanism of fragile material |
| CN112793115B (en) * | 2020-12-22 | 2021-10-22 | 四川大学 | Processing device and matching method of biaxially oriented polyvinyl alcohol film |
| CN113635532B (en) * | 2021-08-09 | 2023-07-28 | 界首市天鸿新材料股份有限公司 | PP/PE/PP three-layer co-extrusion lithium battery power diaphragm casting device |
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