CN105619745A - Preparation method of FFS (Form-Fill-Seal) three-layer co-extrusion heavy packaging film - Google Patents
Preparation method of FFS (Form-Fill-Seal) three-layer co-extrusion heavy packaging film Download PDFInfo
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Abstract
The invention relates to a preparation method of an FFS (Form-Fill-Seal) three-layer co-extrusion heavy packaging film. The method comprises the following steps of (a) providing raw materials; (b) weighing and metering various raw materials obtained in the step (a); (c) adding the weighed and metered raw materials obtained in the step (b) into three groups of extrusion machines corresponding to an inner layer, a middle layer and an outer layer to form three groups of melts; (d) forming the three groups of melts obtained in the step (c) into molten film bubbles; (e) adjusting the thicknesses of the molten film bubbles obtained in the step (d); (f) cooling the molten film bubbles which are obtained in the step (e) and are subjected to thickness adjustment and forming a flat film; (g) treating the flat film obtained in the step (e); (h) rolling the treated flat film obtained in the step (g), and unrolling after a certain roll weight is achieved to obtain a semi-finished film roll; and (i) performing further treatment on the semi-finished film roll obtained in the step (h) to obtain a final product.
Description
Technical field
The method that the present invention relates to the three-layer co-extruded multilayer packing membrane of FFS of a kind of new preparation high uniformity thickness.
Background technology
FFS (Form-Fill-Seal) three-layer co-extruded multilayer packing membrane is the domestic a kind of new packaging material grown up in recent years, owing to it is capable of disposable automatic moulding (Form), automatic open charge (Fill) and the high-speed and continuous operation of automatic bag mouth heated sealant (Seal) multiple working procedure, it is particularly well-suited to large batch of industrialization high-speed packet wiring. By International Classification method, generally the packaging film that can carry 10 kilograms to 50 kilograms is commonly referred to as multilayer packing membrane. This FFS multilayer packing membrane can not only meet the modernization packaging needs of the product such as chemical industry, plastics, is simultaneously applicable to various agricultural product, such as the high-speed packaging of corn, beans etc., has broad application prospects.
Owing to the three-layer co-extruded multilayer packing membrane of FFS produces equipment, the impact of the various factors such as Technology and the raw material applied, in existing preparation method, the quality index of its product, often focus on every physical and mechanical properties index of thin film, such as hot strength, tearing strength, fall to marking impact strength etc., few this index of thickness evenness noting multilayer packing membrane product, even if at BB/T0058-2011 " the packaging multi-layer co-extruded heavy duty film that country promulgates recently, bag " in industry standard, also without relating to how to ensure the realization of this index of film thickness uniformity. at present, domestic all FFS multilayer packing membrane manufacturing enterprise, quality to its product is all carry out sampling observation method to carry out qualification determination, if but the thickness evenness of film is not high, it is easy to this situation occurs, namely, although every Testing index of film is all qualified, it is possible to owing to there are some very thin some positions, make this product that bale broken to occur in rear packaging applications, the quality accident of material leakage occurs, cause the great Compensation for Quality risk of FFS multilayer packing membrane manufacturing enterprise.
At present about document disclosed in FFS multilayer packing membrane also all without the uniformity relating to FFS its thickness of multilayer packing membrane. Such as, publication number is refer to by selecting suitable m-LLDPE (m-linear low density polyethylene) raw material in CN102452204A patent documentation, improves the mechanical property of FFS multilayer packing membrane product, and improves its heat sealability; Publication number be CN103059402A patent documentation in mention by adopt ethylene-vinyl acetate copolymer, metallocene linear-low density polyethylene and ultra-low density polyethylene improve the mechanical property of FFS monolayer multilayer packing membrane; Publication number be CN103029388A patent documentation in relate to a kind of three-layer co-extruded multilayer packing membrane and preparation method thereof, also it is by selecting suitable m-LLDPE, MDPE (medium density polyethylene) and EVA (ethylene-vinyl acetate copolymer) raw material improve the mechanical property of three-layer co-extruded multilayer packing membrane, the surface friction property of heat sealability and film; The patent documentation that publication number is CN103009738A relates to a kind of bis-layers of multilayer packing membrane of FFS and preparation method thereof, is also by selecting suitable raw material to improve the mechanical property of film. But, above-mentioned patent documentation is all without the homogeneity question relating to FFS multilayer packing membrane thickness.
But, in existing preparation method, following various factors all may result in the uneven of film thickness. One is due to various raw material components, especially low proportioning component, there is certain deviation in actual dosage with stoichiometric, it is possible to cause that the film bubble component of zones of different there are differences, and this species diversity finally will cause the film bubble difference in thickness in zones of different; The second situation is owing to there is local resistance difference in melt flow channel, and this species diversity is likely due in runner to locally lie in caused by buildup, thus can cause that the film bubble thickness in some region produces deviation; The third situation is owing to the distribution of film bubble chilling temperature exists inhomogeneities, can cause that film bubble is in the process of vertical and horizontal tension-thining, and deviation occurs in the thickness producing film bubble zones of different.
Therefore, this area is in the urgent need to being developed to overcome the defect of existing preparation method, it is ensured that the preparation method of the three-layer co-extruded multilayer packing membrane of the FFS of thickness high uniformity in preparation process.
Summary of the invention
The preparation method that the invention provides the three-layer co-extruded multilayer packing membrane of the FFS of a kind of novelty, by to thickness on-line checking region-wide in FFS film production process, and carry out corresponding technical process intervention, the real time correction deviation of thickness, thus ensure that the high uniformity of FFS multilayer packing membrane thickness, thus solve problems of the prior art.
On the one hand, the preparation method that the invention provides the three-layer co-extruded multilayer packing membrane of a kind of FFS, the method comprises the following steps:
A () provides following raw material:
The linear low density polyethylene of 20-40 weight portion;
The Low Density Polyethylene of 10-30 weight portion;
The medium density polyethylene of 20-40 weight portion;
The high density polyethylene (HDPE) of 10-30 weight portion; And
The processing aid of 3-6 weight portion;
B each raw material obtained in step (a) is carried out Weighing by (), with the proportion of composing of the internal layer of the three-layer co-extruded multilayer packing membrane of FFS, middle level and the outer layer that ensure gained for internal layer/middle level/outer layer=1/1/1��1/3/1;
C () is weighed in three groups of extruders that each raw material after metering adds corresponding to internal layer, middle level and outer layer by what obtain in step (b), heated, shear and plasticizing to form three groups of melts, wherein, control the melt pressure in outer layer extruder exit between 385��395MPa, the melt pressure at outlet of extruder place, middle level is between 500��540MPa, the melt pressure in inner layer extruder exit is between 370��390MPa, to ensure the thicknesses of layers ratio that the mass flow coincidence theory of three groups of melts corresponding to internal layer, middle level and outer layer sets;
D obtain in step (c) three groups of melt compositions are melting shape film bubble by ();
E the thickness of () melting shape film bubble to obtaining in step (d) is adjusted, to meet the FINAL APPEARANCE dimensional requirement of the three-layer co-extruded multilayer packing membrane of FFS;
F the melting shape film bubble through thickness adjusted obtained in step (e) is cooled down by (), and form smooth diaphragm;
G the smooth diaphragm obtained in step (f) is processed by (), to ensure the printing quality on film surface;
H the treated smooth diaphragm obtained in step (g) is carried out rolling by (), after reaching certain volume weight, doffing obtains semi-finished product film roll; And
I the semi-finished product film roll obtained in step (h) is further processed to obtain final products by ().
In one preferred embodiment, in step (a), the melt flow index of described linear low density polyethylene is 0.5��1.5, and density is 0.90��0.93; The melt flow index of described Low Density Polyethylene is 0.1��0.5, and density is 0.90��0.93; The melt flow index of described medium density polyethylene is 0.1��0.5, and density is 0.92��0.94; The melt flow index of described high density polyethylene (HDPE) is 0.1��0.5, and density is 0.94��0.96; And the melt flow index of described processing aid is 2.0��3.5, density is 0.90��0.95.
Another preferred embodiment in, in step (b), adopt weight-loss method carry out Weighing.
Another preferred embodiment in, in step (c), be weighed what step (b) obtained in three groups of screw extruders that each raw material after metering adds corresponding to internal layer, middle level and outer layer.
Another preferred embodiment in, in step (d), the three groups of melts obtained in step (c) are combined die head by a triple channel, three groups of melts are made to be aggregated into a shared mouth die, and from this die extrusion, forming melting shape film bubble, wherein, original depth during to each tunic extrusion neck ring mold of the corresponding respectively internal layer of the three-layer co-extruded multilayer packing membrane of FFS of described three groups of melts, middle level and outer layer carries out initial adjustment.
Another preferred embodiment in, described initial adjustment includes: be adjusted by three groups of respective extrusion capacities of extruder, the longitudinal traction speed of melting shape film bubble and the hybrid density of melt and melt pressure are calculated the automatic online control of machine.
Another preferred embodiment in, in step (e), after three groups of melts are aggregated into a shared mouth die, through longitudinal stretching, horizontal bubbling, melting shape film bubble size is by 2-3 supersonic reflectoscope measurement location, the size of melting shape film bubble is finely tuned, to meet the three-layer co-extruded multilayer packing membrane FINAL APPEARANCE dimensional requirement of FFS by the cooling air quantity of the outer cooling vane of melting shape film bubble.
Another preferred embodiment in, described fine setting includes: by the 360 degree of circumference of melting shape film bubble after crystallisation by cooling are divided into 32 to 45 decile test points, carry out online real time rotation and measure the film thickness of each point, monitor the real time status of bubble thickness in the three-layer co-extruded multilayer packing membrane preparation process of FFS, wherein, when the bubble thickness thickness indication upper limit more than regulation certain point being detected, then reduce the air door size of the outer cooling vane of this point accordingly, namely the cooling air air quantity of this point is reduced, the melt temperature making regional area film bubble near this point raises, longitudinal stretching and horizontal bubbling effect through film bubble, the bubble thickness making this some place is thinning, return within bubble thickness indication range.
Another preferred embodiment in, in step (f), the various appearance index of film bubble and thickness index reach normal after, it is cooled down further, and regular through man-like shelf film bubble, then through multiple deflector roll shapings, form double-deck smooth diaphragm.
Another preferred embodiment in, in step (g), the smooth diaphragm obtained in step (f) is carried out high-voltage corona process; In step (i), described further process includes plate, optional embossing and printing.
Accompanying drawing explanation
Carrying out following detailed description according in conjunction with accompanying drawing, the purpose of the present invention and feature will be apparent from, in accompanying drawing:
Fig. 1 is the three-layer co-extruded multilayer packing membrane production process schematic diagram of the FFS according to one embodiment of the present invention. In FIG, the following drawings labelling represents with lower component:
1-1: outer layer extruder
1-2: middle level extruder
1-3: inner layer extruder
2: blowing head
3: cooling vane
4: film bubble steady rest
5: cooling vane controller
6-1: film thickness measurement device
6-2: rotary rail
7: deflector roll
8: film wrap-up
9: thickness real-time display device
10: data processing equipment.
Fig. 2 is the suction of each component according to the present invention and the weightless mensuration schematic diagram of poidometer. In fig. 2, the following drawings labelling represents with lower component:
21: materiel fan
22: by pass filter
23: main filter
24: full quantity sensor
25: weightlessness is weighed hopper
26: charging basket.
Detailed description of the invention
Present inventor is finding after extensive and deep research: carry out on-line checking by region-wide thickness in FFS film production process, and carry out corresponding technical process intervention, the deviation of energy real time correction thickness, ensure that the high uniformity of FFS multilayer packing membrane thickness, thus overcoming art methods to may result in the uneven defect of film thickness, and FFS multilayer packing membrane thickness high uniformity in different directions can be prepared, consistent product, improve the overall equalization performance of FFS multilayer packing membrane, reduce product and the risk of quality accident occurs, and can use all over the high-speed packet wiring of the pervasive various operating modes for downstream Different Package speed. based on above-mentioned discovery, the present invention is accomplished.
The preparation method that the invention provides the three-layer co-extruded multilayer packing membrane of a kind of FFS, the method comprises the following steps:
(1) raw material prepares: according to specific product formula, prepare all former, auxiliary materials
The raw material of the present invention includes following five big classes: the linear low density polyethylene (LLDPE) of 20-40 weight portion, 10-30 weight portion Low Density Polyethylene (LDPE), 20-40 weight portion medium density polyethylene (MDPE), 10-30 weight portion high density polyethylene (HDPE), and the processing aid of 3-6 weight portion.
In the present invention, the melt flow index of described linear low density polyethylene is 0.5��1.5, and density is 0.90��0.93; The melt flow index of described Low Density Polyethylene is 0.1��0.5, and density is 0.90��0.93; The melt flow index of described medium density polyethylene is 0.1��0.5, and density is 0.92��0.94; The melt flow index of described high density polyethylene (HDPE) is 0.1��0.5, and density is 0.94��0.96. In the present invention, described processing aid includes, but are not limited to: PPA (polymer of structure based on a kind of fluoro containing polymers polymer, with FX-5911 purchased from American 3M company); The melt flow index of described processing aid is 2.0��3.5, and density is 0.90��0.95.
In the present invention, other additive such as opening agent, antistatic additive etc. can also be added.
(2) accurate measurement of each component raw material and addition
In the present invention, the formula proportion of the three-layer co-extruded multilayer packing membrane specific product of FFS pressed respectively by various raw materials, and various raw materials are carried out weight-loss method Weighing, to ensure the proportion of composing of the internal layer of the three-layer co-extruded multilayer packing membrane product of FFS, middle level and the outer layer that produce. This proportion of composing is: internal layer/middle level/outer layer=1/1/1��1/3/1.
(3) the mixed and plasticizing of each component raw material
In the present invention, it is weighed each raw material after metering and adds three groups of screw extruders corresponding to internal layer, middle level and outer layer, heating, shearing, plasticizing, form melting shape material. By controlling the melt pressure in outer layer extruder, middle level extruder and inner layer extruder exit, the melt pressure in outer layer extruder exit controls between 385��395MPa, the melt pressure at outlet of extruder place, middle level controls between 500��540MPa, the melt pressure in inner layer extruder exit controls between 370��390MPa, the thicknesses of layers ratio that sets of mass flow coincidence theory being melt with ensure corresponding to internal layer, middle level and outer layer three.
(4) bubbling film forming
In the present invention, through three groups of mixed materials of plasticizing and melt quality flow-control completely, combining die head by a triple channel, three strands of melting materials are aggregated into a shared mouth die, and from this die extrusion, form melting shape film bubble. These three strands of melting materials are the corresponding internal layer of the three-layer co-extruded multilayer packing membrane of FFS, middle level and outer layer respectively, and original depth during each tunic outlet mold is adjusted controlling by the output of the melt pressure of material and Ge Tai extruder respectively.
(5) thickness regulates
In the present invention, internal layer, middle level and three strands of materials of outer layer are after mouth die place converges, through longitudinal stretching, horizontal bubbling, film bubble size is by 2-3 supersonic reflectoscope measurement location, carry out trace by the cooling air quantity of the outer cooling vane of film bubble and regulate the size of film bubble, to meet the three-layer co-extruded multilayer packing membrane FINAL APPEARANCE dimensional requirement of FFS.
(5.1) film thickness initial adjustment
The three-layer co-extruded multilayer packing membrane of FFS prepared by the inventive method, the initial adjustment of its thickness is by parameters such as the respective extrusion capacity to three extruders, the longitudinal traction speed of film bubble, and the hybrid density sizes of melt material, the automatic online control of the machine that is calculated, and regulate. Now, the general thickness of film bubble is substantially close to theory index value. Due to a variety of causes, the molecular weight distribution of such as polyethylene raw material is different, the machining accuracy of the melt flow channel of relevant device is different, bubble thickness is likely to not uniformity on laterally 360 degree of circumference, there will be thickness deviation, now need bubble thickness is finely tuned further, to realize the high homogeneity of the three-layer co-extruded multilayer packing membrane thickness of FFS.
(5.2) the fine adjustment of thickness
In the methods of the invention, the fine setting that becomes more meticulous to bubble thickness is by 360 degree of circumference of the film bubble after crystallisation by cooling are divided into 32 to 45 decile test points, carry out online real time rotation and measure the film thickness of each point, monitor the real time status of bubble thickness in the three-layer co-extruded multilayer packing membrane production process of FFS.
To the measurement point beyond thickness indication range, by regulating the outer vane cooling air quantity size of correspondence position, the bubble thickness of this measurement point is carried out fine adjustment, the thickness of film bubble is adjusted within indication range. Specifically, when the bubble thickness thickness indication upper limit more than regulation certain point being detected, then reduce the air door size of the outer cooling vane of these corresponding point accordingly, namely the cooling air air quantity of corresponding point is reduced, the melt temperature of regional area film bubble near this point is made to raise slightly, longitudinal stretching and horizontal inflation effect through film bubble, the bubble thickness making this some place is slowly thinning, return within bubble thickness indication range, thus ensure that the three-layer co-extruded multilayer packing membrane of FFS thickness in all film districts in whole production process has significantly high uniformity or the concordance of film thickness.
(6) film bubble cooling
The various appearance index of film bubble and thickness index reach normal after, be cooled to further, regular through man-like shelf film bubble, then through multiple deflector roll shapings, form smooth diaphragm (bilayer).
(7) sided corona treatment on film surface
By film surface is carried out high-voltage corona process, it is ensured that the printing quality on film surface.
(8) rolling
The rolling machine rolling of diaphragm, after reaching certain volume weight, doffing obtains semi-finished product.
(9) printing
Semi-finished product film roll delivers to next station, carries out plate (or embossing, if desired for), printing etc. and processes, makes final products, for downstream high speed FFS film baling line.
Below according to the method that accompanying drawing describes the present invention in detail.
Fig. 1 is the three-layer co-extruded multilayer packing membrane production process schematic diagram of the FFS according to one embodiment of the present invention. As it is shown in figure 1, be weighed each raw material after metering to add outer layer extruder 1-1, the middle level extruder 1-2 and inner layer extruder 1-3 corresponding to internal layer, middle level and outer layer, heating, shearing and plasticizing, form melting shape material; Through three groups of mixed materials of plasticizing and melt quality flow-control completely, combining blowing head 2 by a triple channel, three strands of melting materials are aggregated into a shared mouth die, and from this die extrusion, form melting shape film bubble; Internal layer, middle level and three strands of materials of outer layer are after mouth die place converges, through longitudinal stretching, horizontal bubbling, film bubble size is by two to three supersonic reflectoscope measurement location, the cooling air quantity of the cooling vane 3 outside by film bubble carrys out trace and regulates the size of film bubble, to meet the three-layer co-extruded multilayer packing membrane FINAL APPEARANCE dimensional requirement of FFS, wherein, film bubble steady rest 4 stable bubble is used; Cooling vane 3 is connected with cooling vane controller 5; 360 degree of circumference of film bubble after crystallisation by cooling are divided into 32 to 45 decile test points, carry out online real time rotation by film thickness measurement device 6-1 and measure the film thickness of each point, monitor the real time status of bubble thickness in the three-layer co-extruded multilayer packing membrane production process of FFS, wherein said film thickness measurement device 6-1 is connected with thickness real-time display device 9 with cooling vane controller 5, this thickness real-time display device 9 is connected with data processing equipment 10, and film thickness measurement device 6-1 carries out 360 degree of reciprocating rotaries on rotary rail 6-2; The various appearance index of film bubble and thickness index reach normal after, cool down further, regular through man-like shelf film bubble, then through the shaping of multiple deflector roll 7, form smooth diaphragm (bilayer); Diaphragm is through film wrap-up 8 rolling.
Fig. 2 is the suction of each component according to the present invention and the weightless mensuration schematic diagram of poidometer. As shown in Figure 2, from the negative pressure that the raw material of charging basket 26 produces through materiel fan 21, suck material, control to be weighed hopper 25 Weighing by weightlessness through full quantity sensor 24, raw material after weighing enters corresponding extruder, wherein main filter 23 and by pass filter 22 filter for the first order in suction process and second level filtration, and the first order filters the coarse powder dirt for removing in suction pipeline, and the ultrafine dust for removing in suction pipeline is filtered in the second level.
The present invention has a major advantage in that:
The preparation method of the new three-layer co-extruded multilayer packing membrane of FFS of the present invention can be used for preparing film thickness and has the FFS product of high uniformity characteristic, the every mechanical and physical performance making FFS three-layer co-extruded multilayer packing membrane product is more balanced in machine and transverse direction, not only can be effectively improved the indicators of overall performance of the three-layer co-extruded multilayer packing membrane product of FFS, also can greatly improve the safety in downstream high-speed packet wiring is applied of this product simultaneously, and the general applicability of the high-speed packaging device to downstream difference operating mode, effectively reduce the generation of this product bale broken after packaging solid particulate material or powder object or material leakage situation, there is good economic benefit and social benefit.
Embodiment
The present invention is expanded on further below in conjunction with specific embodiment. It should be appreciated, however, that these embodiments are merely to illustrate the present invention and are not meant to limit the scope of the invention. The test method of unreceipted actual conditions in the following example, generally conventionally condition, or according to manufacturer it is proposed that condition. Except as otherwise noted, all of percentage ratio and number are by weight.
Embodiment 1:
Flow process shown in Fig. 1 produces the three-layer co-extruded multilayer packing membrane of FFS.
(1) raw material
The raw material used is shown below 1.
Table 1: raw material specification and proportioning
* m-LLDPE: metallocene linear-low density polyethylene
* PPA: processing aid, it is the polymer of structure based on a kind of fluoro containing polymers polymer, with FX-5911 purchased from American 3M company.
(2) plasticizing melt extrusion Stress control
The melt pressure controlling outer layer extruder outlet is 390MPa, and the melt pressure controlling middle level outlet of extruder is 520MPa, and the melt pressure controlling inner layer extruder outlet is 380MPa.
(3) control of film thickness and detection
Produce the FFS film of 180 ��m of thickness. By to the real time measure of 45 Thickness sensitivity points on film bubble circumference, and according to the thickness positive and negative deviation that each point measures, corresponding regulating the throttle opening that each point place is corresponding, thickness is carried out real-time regulable control, result is shown in table 2 below.
Thickness positive and negative deviation is surveyed during table 2:20:32 and 20:36
According to upper table 2, the online film thickness testing result assigning to 20:36 minute from 20:32 shows, there is bigger deviation in the FFS film thickness produced in 32 points, 33 points, 37 points, and 39 5 measurement point at 38, but through thickness on-line measurement and the feedback regulation of nearly 4 minutes, thickness deviation in these five some positions has carried out significantly adjustment (see table 3 below), thickness deviation is maximum decreases by 54%, makes the thickness of film more tend to homogenization.
Table 3: the thickness deviation range of decrease after thickness is automatically adjusted
Further, according to FFS thin film prepared by the FFS film production method of the present invention, the limit deviation of its thickness and average deviation are all significantly better than setting (see table 4 below) in BB/T0058-2011 " packaging multi-layer co-extruded heavy duty film, bag " industry standard.
Table 4: with the comparison of BB/T0058-2011 standard value the product of 180 ��m (thickness be)
Can be seen that from the result of upper table 4, FFS thin film thickness distribution on 360 circumference that the inventive method produces is very uniform, not having any super BB/T0058-2011 standard to enclose the very thin point of model and extremely thick point, its maximum gauge overgauge occurs in 32 positions place, for+10.8 ��m; Maximum gauge minus deviation occurs in 39 positions place, for-7.9 ��m. The two thickness limit deviation value is also well below the setting of BB/T0058-2011 " packaging multi-layer co-extruded heavy duty film, bag " industry standard �� 20 ��m. The thickness actual average deviation of the FFS thin film that the inventive method produces only has 1.1% simultaneously, 6% Mean Deviation value that also substandard allows far away.
Obviously, above-mentioned technique effect is all that the three-layer co-extruded film production process of existing FFS is unapproachable.
The all documents mentioned in the present invention are incorporated as reference all in this application, are individually recited as reference such just as each section of document. In addition, it is to be understood that after the above-mentioned teachings having read the present invention, the present invention can be made various changes or modifications by those skilled in the art, these equivalent form of values fall within the application appended claims limited range equally.
Claims (10)
1. a preparation method for the three-layer co-extruded multilayer packing membrane of FFS, the method comprises the following steps:
A () provides following raw material:
The linear low density polyethylene of 20-40 weight portion;
The Low Density Polyethylene of 10-30 weight portion;
The medium density polyethylene of 20-40 weight portion;
The high density polyethylene (HDPE) of 10-30 weight portion; And
The processing aid of 3-6 weight portion;
B each raw material obtained in step (a) is carried out Weighing by (), with the proportion of composing of the internal layer of the three-layer co-extruded multilayer packing membrane of FFS, middle level and the outer layer that ensure gained for internal layer/middle level/outer layer=1/1/1��1/3/1;
C () is weighed in three groups of extruders that each raw material after metering adds corresponding to internal layer, middle level and outer layer by what obtain in step (b), heated, shear and plasticizing to form three groups of melts, wherein, control the melt pressure in outer layer extruder exit between 385��395MPa, the melt pressure at outlet of extruder place, middle level is between 500��540MPa, the melt pressure in inner layer extruder exit is between 370��390MPa, to ensure the thicknesses of layers ratio that the mass flow coincidence theory of three groups of melts corresponding to internal layer, middle level and outer layer sets;
D obtain in step (c) three groups of melt compositions are melting shape film bubble by ();
E the thickness of () melting shape film bubble to obtaining in step (d) is adjusted, to meet the FINAL APPEARANCE dimensional requirement of the three-layer co-extruded multilayer packing membrane of FFS;
F the melting shape film bubble through thickness adjusted obtained in step (e) is cooled down by (), and form smooth diaphragm;
G the smooth diaphragm obtained in step (f) is processed by (), to ensure the printing quality on film surface;
H the treated smooth diaphragm obtained in step (g) is carried out rolling by (), after reaching certain volume weight, doffing obtains semi-finished product film roll; And
I the semi-finished product film roll obtained in step (h) is further processed to obtain final products by ().
2. method as claimed in claim 1, it is characterised in that in step (a), the melt flow index of described linear low density polyethylene is 0.5��1.5, and density is 0.90��0.93; The melt flow index of described Low Density Polyethylene is 0.1��0.5, and density is 0.90��0.93; The melt flow index of described medium density polyethylene is 0.1��0.5, and density is 0.92��0.94; The melt flow index of described high density polyethylene (HDPE) is 0.1��0.5, and density is 0.94��0.96; And the melt flow index of described processing aid is 2.0��3.5, density is 0.90��0.95.
3. method as claimed in claim 1, it is characterised in that in step (b), adopts weight-loss method to carry out Weighing.
4. as claimed in claim 1 method, it is characterised in that in step (c), by step (b) obtains be weighed metering after each raw material add in three groups of screw extruders corresponding to internal layer, middle level and outer layer.
5. method as claimed in claim 1, it is characterized in that, in step (d), the three groups of melts obtained in step (c) are combined die head by a triple channel, make three groups of melts be aggregated into a shared mouth die, and from this die extrusion, form melting shape film bubble, wherein, to each tunic extrusion neck ring mold of the corresponding respectively internal layer of the three-layer co-extruded multilayer packing membrane of FFS of described three groups of melts, middle level and outer layer original depth time carries out initial adjustment.
6. method as claimed in claim 5, it is characterized in that, described initial adjustment includes: be adjusted by three groups of respective extrusion capacities of extruder, the longitudinal traction speed of melting shape film bubble and the hybrid density of melt and melt pressure are calculated the automatic online control of machine.
7. method as claimed in claim 1, it is characterized in that, in step (e), after three groups of melts are aggregated into a shared mouth die, through longitudinal stretching, horizontal bubbling, melting shape film bubble size, by 2-3 supersonic reflectoscope measurement location, finely tunes the size of melting shape film bubble, to meet the three-layer co-extruded multilayer packing membrane FINAL APPEARANCE dimensional requirement of FFS by the cooling air quantity of the outer cooling vane of melting shape film bubble.
8. method as claimed in claim 7, it is characterized in that, described fine setting includes: by the 360 degree of circumference of melting shape film bubble after crystallisation by cooling are divided into 32 to 45 decile test points, carry out online real time rotation and measure the film thickness of each point, monitor the real time status of bubble thickness in the three-layer co-extruded multilayer packing membrane preparation process of FFS, wherein, when the bubble thickness thickness indication upper limit more than regulation certain point being detected, then reduce the air door size of the outer cooling vane of this point accordingly, namely the cooling air air quantity of this point is reduced, the melt temperature making regional area film bubble near this point raises, longitudinal stretching and horizontal bubbling effect through film bubble, the bubble thickness making this some place is thinning, return within bubble thickness indication range.
9. method as claimed in claim 1, it is characterised in that in step (f), the various appearance index of film bubble and thickness index reach normal after, it is cooled down further, and regular through man-like shelf film bubble, then through multiple deflector roll shapings, form double-deck smooth diaphragm.
10. method as claimed in claim 1, it is characterised in that in step (g), the smooth diaphragm obtained in step (f) is carried out high-voltage corona process; In step (i), described further process includes plate, optional embossing and printing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410624083.1A CN105619745B (en) | 2014-11-07 | 2014-11-07 | The preparation method of the three-layer co-extruded multilayer packing membranes of FFS |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111483202A (en) * | 2020-04-21 | 2020-08-04 | 珠海徐太日用品有限公司 | High-barrier anti-seepage heavy packaging film and preparation method thereof |
| CN113681779A (en) * | 2021-08-31 | 2021-11-23 | 江苏双星彩塑新材料股份有限公司 | Synchronous production system and method for multilayer film |
| CN116476358A (en) * | 2023-06-25 | 2023-07-25 | 山东森荣新材料股份有限公司 | PTFE blank strip uniformity detection device and use method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111483202A (en) * | 2020-04-21 | 2020-08-04 | 珠海徐太日用品有限公司 | High-barrier anti-seepage heavy packaging film and preparation method thereof |
| CN113681779A (en) * | 2021-08-31 | 2021-11-23 | 江苏双星彩塑新材料股份有限公司 | Synchronous production system and method for multilayer film |
| CN113681779B (en) * | 2021-08-31 | 2023-09-01 | 江苏双星彩塑新材料股份有限公司 | Synchronous production system and method for multilayer film |
| CN116476358A (en) * | 2023-06-25 | 2023-07-25 | 山东森荣新材料股份有限公司 | PTFE blank strip uniformity detection device and use method |
| CN116476358B (en) * | 2023-06-25 | 2023-08-15 | 山东森荣新材料股份有限公司 | PTFE blank strip uniformity detection device and use method |
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| CN105619745B (en) | 2017-12-26 |
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Denomination of invention: Preparation method of FFS three-layer co-extruded heavy packaging film Effective date of registration: 20220920 Granted publication date: 20171226 Pledgee: Shanghai Rural Commercial Bank Co.,Ltd. Jinshan sub branch Pledgor: SHANGHAI GULF PETROCHEMICAL CO.,LTD. Registration number: Y2022310000253 |