CN204844770U - Piece rapid prototyping device is cast to flat embrane method polyester thermal contraction membrane - Google Patents
Piece rapid prototyping device is cast to flat embrane method polyester thermal contraction membrane Download PDFInfo
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- CN204844770U CN204844770U CN201520551689.7U CN201520551689U CN204844770U CN 204844770 U CN204844770 U CN 204844770U CN 201520551689 U CN201520551689 U CN 201520551689U CN 204844770 U CN204844770 U CN 204844770U
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Abstract
Piece rapid prototyping device is cast to flat embrane method polyester thermal contraction membrane adopts dedicated modification by copolymerization PET of heat -shrinkable film or PETG, and processing production transverse contraction rate is 50%-78% polyester shrink film. When casting the piece, the fuse -element of double screw extruder melting plastify after the measuring pump pressure boost, is extruded through clothes hanger formula individual layer die head, and in the air of die orifice with roller clearance department briefly cooled off, get into the stack of three parallel arrangement's invariable roller temperature, the shaping was the sheet of certain thickness and width, directly get into one lower production processes through deflector roll, compression roller, draw, draw, the rolling, cut, examine, pack, obtain the finished product at last. Avoid traditional cold drum - electrostatic absorption not enough problem of electrostatic absorption power in the piece mode of casting, made the speed of production of putting down embrane method polyester thermal contraction (label) membrane production line reach 80-120 meters / minute, improved the production efficiency of polyester thermal contraction membrane by a wide margin.
Description
Technical field
The utility model relates to plastic sheeting preparation field, particularly relates to flat embrane method polyester thermal contraction film rapid molding device and method thereof.
Background technology
Polyester thermal contraction film is developed successfully by the professional film production producer such as France, Japan, the U.S. phase late 1980s.Polyester thermal contraction film has good machinery, optics and printing performance, is one of world today's heat shrink films principal item, is also shrink sleeve label polyester thermal contractive label film product most with prospects.
Polyester thermal contraction (label) film forming method has flat embrane method (casting and stretching) and blowing two kinds.Due to polyester PET melt viscosity and melt strength lower, processing temperature window narrows, blowfilm shaping is very difficult.At present rest on the experimental study stage, a small amount of industrialized production technology, the shrink sleeve film also only for little folding footpath more.Therefore, pack the polyester shrink film of purposes for shrink label and other, almost all adopt flat embrane method to produce.
Polyester thermal contractive label film requires higher to shrinkage factor, and be generally greater than 50%, some is also greater than 70%, and is punctured into master with unidirectional.Common PET is because degree of crystallinity is high, and the percent thermal shrinkage of film cannot meet shrink sleeve label requirement.In order to prepare the polyester film with larger shrinkage factor, the main copolymerization modification method that adopts prepares heat-shrinkable film dedicated polyester raw material to meet this requirement both at home and abroad at present.Comonomer mainly contains M-phthalic acid, neopentyl glycol, 1,4-CHDM etc.By introducing above-mentioned comonomer segment in normal polyester strand, destroying its crystallinity, slackening the rigidity of macromolecular chain, the thermal contraction performance of polyester is improved.
The modified poly ester flat embrane method production line of heat shrinkable films situation of the domestic and international different manufacturers of induction and conclusion, can be divided into two classes, a class is after slab, only carries out cross directional stretch; One class is after slab, first carries out low range longitudinal stretching, then cross directional stretch.
Flat embrane method polyester thermal contraction (label) film production process flow process is:
Raw and auxiliary material →
dry→ conveying and metering → extruder plasticizing → measuring pump → die head curtain coating → slab →
longitudinal stretching→ cross directional stretch → traction → rolling → cut → check → packaging → finished product
Note: (some production line of italics operation has, and some does not have)
Because polyester PET material melt viscosity is low, during flat embrane method slab, the method adopting single only cold drum+Electrostatic Absorption more.As Fig. 1. shown in
the cold drum of 1-die head 2-(chill roll) 3-electrostatic silk (band) 4-stripper roll 5-dancer rools 6-pressure roller 7-frame
During slab, after high-temperature fusant curtain coating to the cold bulging surface of bright and clean, low temperature, high-speed rotation,
by electrostatic adsorption forcebe close to cold drum surface, cooling forming is the even sheet meeting technological requirement.
Electrostatic Absorption is the DC voltage of several kilovolts that utilize high pressure generator to produce, wire electrode and cold drum is made to be respectively negative pole and positive pole (cold bulging ground connection), curtain coating is to the sheet on cold drum, in this high-voltage electrostatic field, produce electric charge orientation to move because of electrostatic induction, there is charge accumulated and form interfacial polarization, forming anti-electric field in slab thicknesses direction.Under the effect of different in nature electrostatic charge mutual attractive force, sheet and cold bulging intimate surface adsorb and fit together, and reach the effect of deaeration and good heat transfer.
During curtain coating slab, if there is no External Force Acting, be not easily attached at cold drum surface through the sheet that chilling is shaping on the one hand, on the other hand, be easy to sandwich air between sheet and cold drum, reduce heat-transfer effect, have a strong impact on slab quality.Therefore, slab is very important operation and link during flat embrane method polyester thermal contraction film is produced, and is the key that membrane quality ensures.
Meanwhile, slab speed also determines foil production speed.From current practice, slab speed has become the slow main cause of flat embrane method polyester thermal contraction film line speed slowly and has promoted bottleneck.Research shows, the slab speed of cold drum+Electrostatic Absorption mode depends on the electrostatic adsorption force between sheet and cold drum.Electrostatic adsorption force again with PET material
molten state ratio resistance,
the DC voltage of electrostatic adsorption device, wire electrode diameter and distance dependent between wire electrode and slab.By improving electrostatic adsorption device Structure and energy, effectively can promote electrostatic adsorption force, but the adjustment of DC voltage, wire electrode diameter and the distance between wire electrode and slab all exists necessarily limiting.In fact, these factors are improved to the Limiting Level of current techniques by current flat embrane method polyester thermal contraction film production line, are difficult to improve further again.Therefore, want to realize quick production, it is obviously inadequate for depending merely on improving of electrostatic adsorption device.
But the introducing of comonomer in raw material, makes the polarity of PET material reduce, melting ratio resistance increases, and during slab, electrostatic adsorption force reduces.Not only cannot be improved from raw material angle, also be exacerbated this problem further.
In this case, in order to ensure the quality of slab and final film product, the slab technique adopting low rate is only had.Flat embrane method polyester thermal contraction (label) film speed of production that Here it is is slow, the main cause that production efficiency is low.
Current flat embrane method polyester thermal contraction (label) film speed of production, at about 40 ms/min, reaches as high as 60 ms/min.Compared with the throughput rate of about 400 ms/min of BOPET film, gap is obvious.Certainly, need to consider that the speed of 3,4 times that in BOPET film, longitudinal stretching brings promotes.Even if reject the speed lifting factor that longitudinal stretching brings, current flat embrane method polyester thermal contraction (label) film speed of production is also obviously on the low side.
The mechanical arrangements of other operation of flat embrane method polyester thermal contraction (label) film production line, little with common BOPET film production line difference, can run production at higher speeds completely, mechanical speed generally can reach 200 ms/min, even higher.Therefore, the low rate of slab operation is the key factor causing flat embrane method polyester thermal contraction film speed of production slow.As long as slab speed can be improved, just the slow problem of this production line rate thoroughly can be solved.
Summary of the invention
The utility model, for the deficiencies in the prior art, provides the preparation method of the shaping flat embrane method polyester thermal contraction film slab rapid molding device of a kind of slab adopting calendering film-making mode to substitute the cold drum+Electrostatic Absorption of traditional list and polyester thermal contraction film thereof.
For realizing the utility model object, provide following technical scheme: flat embrane method polyester thermal contraction film slab rapid molding device, it is characterized in that comprising die head, parallel three rollers, deflector roll and pressure roller, before described parallel three rollers comprise side-by-side parallel setting successively, in, rear roller, middle roll axis is fixedly installed, front and back two rollers are set to move along axis, to adjust the flexible connection of roll gap, before die head is arranged at, directly over central roll gap, deflector roll is set in parallel on the left of rear roller, pressure roller is set in parallel on the left of deflector roll, pressure roller comprises up-down rollers, described parallel three rollers, the upper roll surface of the lower roll of deflector roll and pressure roller is all positioned at same plane.
As preferably, die ends is 20 ~ 30mm to the distance of the axis of front, central roll.
As preferably, parallel three roller diameters are identical, and diameter is 400-500mm, and material is 45# steel, chrome-faced, and fineness is 0.05 ~ 0.1 μm.
As preferably, parallel three rollers are hollow type, and with chuck, carry out temperature control by recirculated water, roller temperature control is at 35-55 DEG C.
As preferably, deflector roll is set to 4, and material is 45# steel, diameter 200-300mm.
As preferably, pressure roller is rubber covered roll, diameter 200-300mm.
As preferably, die head is self-adjustment clothes rack formula single layer die, die lip width 200-1500mm, lip aperture 1.0 ~ 3.8mm, adjusting bolt 20-48.
For realizing the utility model object, providing the quick slab molding method for preparing of a kind of flat embrane method polyester thermal contraction film, comprising the following steps:
A. raw and auxiliary material is carried out metering conveying, extrusion plasticizing, be delivered to die head with measuring pump metering and carry out slab;
B. during slab, die orifice and roller distance is regulated to be 20-30mm, die gap is 0.13-0.32mm, front central roll, in after between roller gap be 0.1-0.31mm, before, in, rear 3 roller roller temperature are 35-55 DEG C ± 1 DEG C, from the modified poly ester melt that die head flows out, first before entering into, in central roll gap, be rolled into the sheet material that thickness is about 0.112-0.28mm, sheet material and front middle roll gap contact position retain a small amount of buildup, material coil diameter is about 3-5mm, the central roll rotated, during shaping sheet material is brought into, rear roller gap, and make its coated rear roller, cooling sheet material another side, cooling polishing sheet material leave rear roller after, pass through deflector roll, pressure roller,
C. directly enter down that one production process is carried out stretching, drawn, rolling, cut, check, pack and finally obtain finished product.
The utility model beneficial effect: evaded the hypodynamic problem of Electrostatic Absorption in traditional slab mode, the thickness of shaping sheet is controlled by roll gap, the two-sided type of cooling of three-roll formation is utilized to improve cooling effect, slab speed lean on before, during and after 3 stack rotating speeds adjust, under the prerequisite ensureing product quality, make the speed of production of flat embrane method polyester thermal contraction (label) film production line reach 80 ~ 120 ms/min, significantly improve the production efficiency of polyester thermal contraction film.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of prior art.
Fig. 2 is schematic flow sheet of the present utility model.
Detailed description of the invention
Embodiment 1:
The main configuring condition of flat embrane method polyester thermal contractive label film production line
Film product width 4200mm, 2 three-layer co-extruded machine-shaping modes of extruder.
Master operation basic configuration situation:
(1) raw material system: feed bin 20m3 × 3; Vacuum handling ability 1000kg/h; Vector metering device 6 overlaps.
(2) extruder: main extruder, parallel double-screw, screw diameter 120mm, draw ratio 40:1, specified extrusion capacity 1000kg/h; Subsidiary extruder, parallel double-screw, screw diameter 77mm, draw ratio 40:1, specified extrusion capacity 200kg/h.
(3) measuring pump: main extruder is supporting, two gear positive displacements, ability 371cm3/rpm; Subsidiary extruder is supporting, two gear positive displacements, ability 46cm3/rpm.
(4) die head: self-adjustment clothes rack formula single layer die, die lip width 1016mm, lip aperture 1.0 ~ 3.0, adjusting bolt 40.
(5) slab: before, during and after roller, Ф 450 × 1500,45# steel, chrome-faced, fineness 0.07 μm, logical recirculated cooling water carries out temperature control; Deflector roll, 4,45# steel, Ф 250 × 1500; Pressure roller, 2, rubber coating roller, Ф 200 × 1500.
(6) cross directional stretch: drawing zone is arranged, preheating section 3 sections, stretch section 3 sections, sizing section 4 sections, cooling section 2 sections; Draw ratio 1:3 ~ 1:6.
(7) draw: carry-over pinch rolls, 7, diameter 350mm.
(8) rolling: double contact and gap winder, rolling width 4200mm, take-up diameter 1000mm.
Flat embrane method polyester thermal contraction film slab rapid molding device, comprise die head 1, parallel three rollers 2, deflector roll 3 and pressure roller 4, before described parallel three rollers 2 comprise side-by-side parallel setting successively, in, rear roller (2.1, 2.2, 2.3), central roll 2.2 axis is fixedly installed, front and back two rollers (2.1, 2.3) be set to move along axis, to adjust the flexible connection of roll gap, before die head 1 is arranged at, central roll (2.1, 2.2) directly over gap, deflector roll 3 is set in parallel on the left of rear roller 2.3, pressure roller 4 is set in parallel on the left of deflector roll 3, pressure roller 4 comprises up-down rollers (4.1, 4.2), described parallel three rollers 2, the upper roll surface of the lower roll 4.2 of deflector roll 3 and pressure roller 4 is all positioned at same plane.Die head 1 end is 20 ~ 30mm to the distance of the axis of front, central roll (2.1,2.2).Parallel three roller 2 diameters are identical, and diameter is 400-500mm, and material is 45# steel, chrome-faced, and fineness is 0.05 ~ 0.1 μm.Parallel three rollers 2 are hollow type, and with chuck, carry out temperature control by recirculated water, roller temperature control is at 35-55 DEG C.
During production operation: raw and auxiliary material is carried out metering conveying, extrusion plasticizing, be delivered to die head with measuring pump metering and carry out slab, during slab, die orifice and roller distance is regulated to be 25mm, die gap is 230 μm, front central roll, in after between roller gap be 210 μm, before, in, rear 3 roller roller temperature are 38 ± 1 DEG C, from the modified poly ester melt that die head flows out, first before entering into, in central roll gap, be rolled into the sheet material that thickness is about 210 μm, sheet material and front middle roll gap contact position retain a small amount of buildup, material coil diameter is about 5mm, the central roll rotated, during shaping sheet material is brought into, rear roller gap, and make its coated rear roller, cooling sheet material another side, cooling polishing sheet material leave rear roller after, pass through deflector roll, pressure roller, enter down that one production process is carried out stretching, drawn, rolling, cut, check, pack and finally obtain finished product.
Speed of production and product index
Line speed: 115 ~ 118 ms/min.
Film product index:
Thickness: 45 μm; Shrinkage factor: horizontal 75%, longitudinal 1 ~ 2%.
Claims (7)
1. flat embrane method polyester thermal contraction film slab rapid molding device, it is characterized in that comprising die head, parallel three rollers, deflector roll and pressure roller, before described parallel three rollers comprise side-by-side parallel setting successively, in, rear roller, middle roll axis is fixedly installed, front and back two rollers are set to move along axis, to adjust the flexible connection of roll gap, before die head is arranged at, directly over central roll gap, deflector roll is set in parallel on the left of rear roller, pressure roller is set in parallel on the left of deflector roll, pressure roller comprises up-down rollers, described parallel three rollers, the upper roll surface of the lower roll of deflector roll and pressure roller is all positioned at same plane.
2. flat embrane method polyester thermal contraction film slab rapid molding device according to claim 1, is characterized in that die ends is 20 ~ 30mm to the distance of the axis of front, central roll.
3. flat embrane method polyester thermal contraction film slab rapid molding device according to claim 1, it is characterized in that parallel three roller diameters are identical, diameter is 400-500mm, and material is 45# steel, chrome-faced, and fineness is 0.05 ~ 0.1 μm.
4. flat embrane method polyester thermal contraction film slab rapid molding device according to claim 1, it is characterized in that parallel three rollers are hollow type, with chuck, carry out temperature control by recirculated water, roller temperature control is at 35-55 DEG C.
5. flat embrane method polyester thermal contraction film slab rapid molding device according to claim 1, it is characterized in that deflector roll is set to 4, material is 45# steel, diameter 200-300mm.
6. flat embrane method polyester thermal contraction film slab rapid molding device according to claim 1, is characterized in that pressure roller is rubber covered roll, diameter 200-300mm.
7. flat embrane method polyester thermal contraction film slab rapid molding device according to claim 1, is characterized in that die head is self-adjustment clothes rack formula single layer die, die lip width 200-1500mm, lip aperture 1.0 ~ 3.8mm, adjusting bolt 20-48.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520551689.7U CN204844770U (en) | 2015-07-28 | 2015-07-28 | Piece rapid prototyping device is cast to flat embrane method polyester thermal contraction membrane |
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| CN201520551689.7U CN204844770U (en) | 2015-07-28 | 2015-07-28 | Piece rapid prototyping device is cast to flat embrane method polyester thermal contraction membrane |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105034303A (en) * | 2015-07-28 | 2015-11-11 | 江苏光辉包装材料有限公司 | Rapid forming device and preparation method for flat-film-method polyester thermal contraction film cast sheet |
| CN108773094A (en) * | 2018-05-25 | 2018-11-09 | 四川雅齐医疗科技有限公司 | The preparation method of diaphragm for appliance |
| CN110877448A (en) * | 2018-09-05 | 2020-03-13 | 李鑫 | Cast sheet system of polyethylene microporous membrane with three-dimensional restraint |
-
2015
- 2015-07-28 CN CN201520551689.7U patent/CN204844770U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105034303A (en) * | 2015-07-28 | 2015-11-11 | 江苏光辉包装材料有限公司 | Rapid forming device and preparation method for flat-film-method polyester thermal contraction film cast sheet |
| CN108773094A (en) * | 2018-05-25 | 2018-11-09 | 四川雅齐医疗科技有限公司 | The preparation method of diaphragm for appliance |
| CN110877448A (en) * | 2018-09-05 | 2020-03-13 | 李鑫 | Cast sheet system of polyethylene microporous membrane with three-dimensional restraint |
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