CN1951773A - Multilayer packing membrane and method of manufacturing same - Google Patents
Multilayer packing membrane and method of manufacturing same Download PDFInfo
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- CN1951773A CN1951773A CN 200510030628 CN200510030628A CN1951773A CN 1951773 A CN1951773 A CN 1951773A CN 200510030628 CN200510030628 CN 200510030628 CN 200510030628 A CN200510030628 A CN 200510030628A CN 1951773 A CN1951773 A CN 1951773A
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Abstract
The invention relates to a package film and relative production. Wherein, it comprises outer layer, middle layer, inner layer, whose thicknesses are rationed at 1:1:1 to 1:3:1; the outer layer is made from linear low-density polyethylene, low-density polyethylene, smooth mother material and anti-static mother material; the middle layer is made from linear low-density polyethylene, high-density polyethylene, whiten mother particles; the inner layer is made from linear low-density polyethylene, low-density polyethylene, and opened mother material. The invention can confirm the size of FFS film in the standard, and make its properties reach ISO international standards.
Description
Technical field
The present invention relates to the packaging film field, relate in particular to a kind of multilayer packing membrane and manufacture method thereof.
Background technology
The packing of traditional polyethylene, polypropylene, polyphenyl the second grade resin granular material, use is by open-topped papery compound braided bag, complicated because operation is many when packing, thereby the capacity packing of its wall scroll baling line is limited in below 500 bags/hour usually, be single line year the maximum packing amount about 4,100,000, can only be applicable to the polymer production device of 100,000 ton/years of following output, if be applied to surpass on 200,000 ton/years the polymer packaging line, not only packaging efficiency is low but also cost is high.
The multilayer packing membrane product that matches with the automatic packaging line of massive synthetic resin product, extensively adopt once " moulding-filling-sealing (Form-Fill-Seal; be called for short FFS) " blowing-film for bags of continuity, this is the domestic a kind of Novel heavy packaging film product that had just grown up over the past two years. Because in the package handling process, realized that multiple working procedure and operation process once finish continuously automatically, make capacity packing usually can reach 1700～1900 bags/hour, thereby satisfied the needs of ultra-large type synthetic resin device high-speed packaging.
Production scale from the synthetic resin device, the average level of nineteen ninety whole world new device is between 8～100,000 ton/years, and the scale of building afterwards device in 2000 is 200,000 ton/years at least, at present just further to centralization and maximization future development, its newly-built or planning scale of planning to build device is generally more than 400,000 tons.
This shows that along with the synthetic resin unit scale increases rapidly, traditional papery composite membrane woven bag can not satisfy now large industrial demand far away. And FFS blowing-film for bags product, has outstanding combination property at aspects such as the packing of product, storage, transportation, protection against the tide and outward appearances, comply with requirement and the trend of international product packing, simultaneously because of very easily recycling of its packaging bag, and can not cause any pollution to environment, meet country and encourage the resource circulation utilization of enforcement and the needs of the strategy of sustainable development, deeply be subjected to user's welcome, will progressively substitute traditional papery composite membrane woven bag and become the main product of domestic heavy packaging industry.
But because novel FFS blowing-film for bags product is after calendar year 2001, just just at home trial production, real Applicative time is not very long, its product quality indicator up to this point not yet forms unified national standard, only is by consulting to determine with the form of contract between each user and the supplier with reference to foreign standard. The prescription of product is more immature, be in update and change among, thereby the mechanical property such as hot strength of its product, yield strength, elongation at break, dart impact strength is very unstable, make that the automatic packaging production line in downstream is difficult to keep normally, fast production pattern, often occur that inclusion breaks, heat seal strength is not enough, sealing temperature and time do not have the multiple accidents such as rule, so that the broken rate after the packing of product is high, cause very large loss not only for the specific product user in downstream, bring very large pressure also for simultaneously the normal production of automatic packaging production line.
Summary of the invention
The technical issues that need to address of the present invention have provided a kind of multilayer packing membrane, are intended to solve above-mentioned defective;
The present invention also provides a kind of method of making this multilayer packing membrane.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
Multilayer packing membrane of the present invention comprises three layers: skin, middle level, internal layer; Its thickness proportion is between 1: 1: 1 to 1: 3: 1; Described skin is by LLDPE (LLDPE), low density polyethylene (LDPE) (LDPE), and smooth masterbatch, antistatic master batch forms; Described middle level is by LLDPE, high density polyethylene (HDPE) (HDPE), and brightening mother particle forms; Described internal layer is by LLDPE, low density polyethylene (LDPE), and the opening masterbatch forms;
The mass percent of the LLDPE in the described skin, low density polyethylene (LDPE), smooth masterbatch and antistatic master batch is: 60.0～75.0,35.0～20.0,2.5,2.5; The mass percent of the LLDPE in the described middle level, high density polyethylene (HDPE) and brightening mother particle is: 60.0～75.0,35.0～20.0,5.0; LLDPE in the described internal layer, low density polyethylene (LDPE) and opening masterbatch mass percent are: 60.0～75.0,37.5～22.5,2.5;
The molten finger g/10min of described LLDPE is 0.2～1.2, density g/cm30.90～0.94;
Low density polyethylene (LDPE) in the described skin is molten to refer to that g/10min is 0.2～1.2, density g/cm30.90～0.94;
Low density polyethylene (LDPE) in the described internal layer is molten to refer to that g/10min is 0.2～1.2, density g/cm30.90～0.94;
The molten finger g/10min of described smooth masterbatch is 0.1～9.0, density g/cm30.90～1.05;
The molten finger g/10min of described antistatic master batch is 10.1～16.0, density g/cm30.90～1.05;
The molten finger g/10min of described high density polyethylene (HDPE) is 0.2～1.2, density g/cm30.94～0.96;
The molten finger g/10min of described brightening mother particle is 0.2～10.2, density g/cm30.90～1.05;
The molten finger g/10min of described opening masterbatch is 0.2～10.0, density g/cm30.95～1.05;
Manufacture method of the present invention realizes by following steps:
Be that 60.0～75.0,35.0～20.0,2.5,2.5 proportioning is sent into the First extruder and plastified under 170～220 ℃ condition and extrude processing extruding mean temperature with the LLDPE in the skin, low density polyethylene (LDPE), smooth masterbatch, antistatic master batch according to mass percent;
Be that 60.0～75.0,35.0～20.0,5.0 proportioning is sent into second extruder and plastified under 170～220 ℃ condition and extrude processing extruding mean temperature with the LLDPE in the middle level, high density polyethylene (HDPE), brightening mother particle according to mass percent;
With the LLDPE in the internal layer, low density polyethylene (LDPE) and opening masterbatch are that 60.0～75.0,37.5～22.5,2.5 proportioning is sent into the 3rd extruder and plastified under 170～220 ℃ condition and extrude processing extruding mean temperature according to mass percent;
The batching of three extruders is delivered to die head, under 200～220 ℃ operating temperature, difference film forming middle level, internal layer and skin;
Extruded by die head by artificial draping mechanism;
The cooling-air that is controlled at below 25 ℃ through temperature propels the price of the film forming bubble, and the film bubble is outside to be cooled off by cooling vane, is cooled off by the multiple tracks cooling-air in the film bubble, and on film bubble top hot-air is taken away;
But by the cooling-air air inflow controlling diaphragm bubble of adjusting the film bubble be stabilized under certain air pressure (～0.3bar), reach propelling the price of than requiring of setting;
The film bubble enters stable bubble frame behind cooling vane, carry out the measurement of vesicle diameter and thickness distribution by the 360 degree rotations of film bubble measuring instrument, and feed back to regulating system, in time rectifies a deviation by the fine setting cooling air quantity, realizes at last the regulation and control of film thickness;
The film bubble enters man-like shelf, and man-like shelf is done 360 degree rotations with the rotation traction traction platform in order to the inhomogeneities of thickness is distributed on the circumference of whole film bubble;
Film enters one group of horizontal reversing roller of top behind carry-over pinch rolls, realize the commutation of film;
Film imports corona treatment plant again to remove static behind deflector roll, enter winder mechanism and carry out rolling, sets when requiring when the film coil diameter reaches, and automatically cuts;
Film after the rolling through unreel, print, dry, embossing and flanging process after again rolling;
The protection polybag that has anti-ultraviolet function on the film volume outer cover, and after pack with plank or hardboard etc. at two ends is transported into the warehouse for finished product piling or directly loads and transports to the user.
Compared with prior art, its production equipment the invention has the beneficial effects as follows: as long as can guarantee that the physical dimension of FFS film product is in the excursion of standard code, can guarantee that every mechanical performance index of its product all reaches the requirement of ISO international standard, thereby can guarantee to satisfy the normal operation of downstream packaging production line.
The specific embodiment
Below in conjunction with the specific embodiment the present invention is described in further detail:
The member and main geometric of FFS film product and allowable error such as following table 1 (take conventional thickness 0.16mm as example)
| Title | Index | Allowable error |
| Bag length | ～800mm | ±6mm |
| The sack width | 400mm | ±5mm |
| The flanging width | 150mm | ±5mm |
| Cylinder film girth | 1100mm | ±10mm |
| Embossing width | 55mm | ±5mm |
| The embossing belt spacing | 100mm | ±10mm |
| Film thickness | 0.16mm | ±8％ |
| Embossed height | 0.32mm | +5μm/-30μm |
The main performance index of FFS film product and testing standard such as following table 2:
| The test event title | Direction | Applied code | Parameter | Remarks |
| Hot strength Mpa | Vertically | ISO527 | ≥26 | Test speed 500mm/min |
| Laterally | ISO527 | ≥24 | ||
| Elongation at break % | Vertically | ISO527 | ≥600 | Test speed 500mm/min |
| Laterally | ISO527 | ≥700 | ||
| Yield strength Mpa | Vertically | ISO527 | ≥11 | Test speed 500mm/min |
| Laterally | ISO527 | ≥11 | ||
| Drop-dart impact test g | The two sides | ISO7765 | ≥500 | Staircase method |
| Flanging | ISO7765 | ≥300 | ||
| Coefficient of friction | Vertically | ISO8295 | 0.4～0.6 | Test speed 100mm/min |
| Laterally | ISO8295 | 0.4～0.6 | ||
| 90 ℃ of elongation % | Vertically | Company standard | ≤20 | The width of test membrane sample is 25mm, and length is 50mm; Test weight is |
| Laterally | Company standard | ≤40 | 50mm; Test weight is 500g; 1 hour testing time, 90 ℃ of temperature. |
Principle of the present invention and scheme are as follows:
Because the packing of synthetical resin products belongs to heavy packaging industry, not only need to guarantee the intensity of sack, need simultaneously to consider the performances such as heat-sealing, printing, well-pressed and piling, so should select PP TYPEs three-layer co-extruded or more than three layers. Its main cause is: three-layer extrusion film can progressively decompose quality index, utilizes different retes to satisfy different quality index demands, thereby reaches the requirement of satisfying the total quality index. As selecting the prescription that viscosity is good, antistatic, the printing color performance is good at skin; The prescription that the intermediate layer selection intensity is high, deflection is high; Innermost layer selects that heat sealability is good, the prescription of good seal performance etc., satisfies user's demand. According to practical production experience, monofilm is difficult to realize simultaneously these purposes, can only solve this class problem by the consumption that strengthens additive, finally cause in the situation that equal in quality requires, although manually not needing increases, the corresponding increase of the thickness of its film product, consumption of raw materials increases by 10～15%, public work consumption also increases thereupon, and integrated cost obviously rises. In addition, select co-extrusion film more than three layers also can satisfy the demand (as selecting four layers or five-layer co-squeezing film etc.) of product quality, but need to increase the quantity of extruder, equipment investment expense and operating cost obviously rise, energy resource consumption increases, and is unreasonable economically. So, aspect the packaging film production of synthetic resin, should adopt three-layer co-extruded film-blowing process.
Embodiment 1: get raw material total amount 100kg.
Concrete prescription is as follows:
| Each layer materials quality kg | Material name | The molten g/10min that refers to | Density g/cm3 | Mass ratio % in the layer |
| Outer: 25 | LLDPE | 1.1 | 0.918 | 65.0 |
| LDPE | 0.25 | 0.92 | 32.5 |
| Smooth masterbatch | 0.2 | 1.04 | 2.5 | |
| Antistatic master batch | 15 | 1.03 | 2.5 | |
| Middle level: 50 | LLDPE | 0.92 | 0.90 | 60.0 |
| HDPE | 0.35 | 0.95 | 35.0 | |
| Brightening mother particle | 10.2 | 1.05 | 5.0 | |
| Internal layer: 25 | LLDPE | 0.92 | 0.90 | 75.0 |
| LDPE | 0.25 | 0.92 | 22.5 | |
| The opening masterbatch | 8.0 | 1.05 | 2.5 |
By after the production technology extrusion molding, the part that the sample physical dimension is all met table 1 specification requirement is carried out sample analysis by three-layer co-extruded membrane blowing production line, and the mechanical performance index of products obtained therefrom all meets standard-required. Concrete data are as follows:
| The test event title | Direction | Canonical parameter | The actual measurement parameter | Remarks |
| Hot strength Mpa | Vertically | ≥26 | 27.5 | Test speed 500mm/min |
| Laterally | ≥24 | 25.2 | ||
| Elongation at break % | Vertically | ≥600 | 720 | Test speed 500mm/min |
| Laterally | ≥700 | 850 | ||
| Yield strength Mpa | Vertically | ≥11 | 11.8 | Test speed 500mm/min |
| Laterally | ≥11 | 12.6 | ||
| Drop-dart impact test g | The two sides | ≥500 | 650 | Staircase method |
| Flanging | ≥300 | 360 | ||
| Coefficient of friction | Vertically | 0.4～0.6 | 0.41 | Test speed 100mm/min |
| Laterally | 0.4～0.6 | 0.42 |
| 90 ℃ of elongation % | Vertically | ≤20 | 16 | Test membrane sample width is 25mm, and length is 50mm; Test weight is 500g; 1 hour testing time, 90 ℃ of temperature. |
| Laterally | ≤40 | 38 |
Embodiment 2: get raw material total amount 1000kg.
Concrete prescription is as follows:
| Each layer materials quality kg | Material name | The molten g/10min that refers to | Density g/cm3 | Mass ratio % in the layer |
| Outer: 250 | LLDPE | 0.35 | 0.901 | 75.0 |
| LDPE | 0.25 | 0.92 | 20.0 | |
| Smooth masterbatch | 0.2 | 1.05 | 2.5 | |
| Antistatic master batch | 14 | 1.02 | 2.5 | |
| Middle level: 500 | LLDPE | 0.68 | 0.938 | 75.0 |
| HDPE | 0.30 | 0.96 | 20.0 | |
| Brightening mother particle | 10.2 | 1.05 | 5.0 | |
| Internal layer: 250 | LLDPE | 1.01 | 0.91 | 75.0 |
| LDPE | 0.30 | 0.9 | 22.5 | |
| The opening masterbatch | 8.0 | 1.05 | 2.5 |
By after the above-mentioned production technology extrusion molding, the part that the sample physical dimension is all met table 1 specification requirement is carried out sample analysis by three-layer co-extruded membrane blowing production line, and the mechanical performance index of products obtained therefrom all meets standard-required. Concrete data are as follows:
| The test event title | Direction | Canonical parameter | The actual measurement parameter | Remarks |
| Hot strength | Vertically | ≥26 | 29 | Test speed |
| Mpa | Laterally | ≥24 | 26 | 500mm/min |
| Elongation at break % | Vertically | ≥600 | 980 | Test speed 500mm/min |
| Laterally | ≥700 | 860 | ||
| Yield strength Mpa | Vertically | ≥11 | 12.3 | Test speed 500mm/min |
| Laterally | ≥11 | 12.8 | ||
| Drop-dart impact test g | The two sides | ≥500 | 680 | Staircase method |
| Flanging | ≥300 | 370 | ||
| Coefficient of friction | Vertically | 0.4～0.6 | 0.42 | Test speed 100mm/min |
| Laterally | 0.4～0.6 | 0.43 | ||
| 90 ℃ of elongation % | Vertically | ≤20 | 13 | Test membrane sample width is 25mm, and length is 50mm; Test weight is 500g; 1 hour testing time, 90 ℃ of temperature. |
| Laterally | ≤40 | 36 |
Embodiment 3: get raw material total amount 1000kg.
Concrete prescription is as follows:
| Each layer materials quality kg | Material name | The molten g/10min that refers to | Density g/cm3 | Mass ratio % in the layer |
| Outer: 250 | LLDPE | 0.35 | 0.901 | 60.0 |
| LDPE | 0.25 | 0.92 | 35.0 | |
| Smooth masterbatch | 0.2 | 1.05 | 2.5 | |
| Antistatic master batch | 14 | 1.02 | 2.5 | |
| Middle level: 500 | LLDPE | 0.68 | 0.938 | 60.0 |
| HDPE | 0.30 | 0.96 | 35.0 |
| Brightening mother particle | 10.2 | 1.05 | 5.0 | |
| Internal layer: 250 | LLDPE | 1.01 | 0.91 | 60.0 |
| LDPE | 0.30 | 0.93 | 37.5 | |
| The opening masterbatch | 8.0 | 1.05 | 2.5 |
By after the above-mentioned production technology extrusion molding, the part that the sample physical dimension is all met table 1 specification requirement is carried out sample analysis by three-layer co-extruded membrane blowing production line, and the mechanical performance index of products obtained therefrom all meets standard-required. Concrete data are as follows:
| The test event title | Direction | Canonical parameter | The actual measurement parameter | Remarks |
| Hot strength Mpa | Vertically | ≥26 | 26.5 | Test speed 500mm/min |
| Laterally | ≥24 | 25.8 | ||
| Elongation at break % | Vertically | ≥600 | 680 | Test speed 500mm/min |
| Laterally | ≥700 | 730 | ||
| Yield strength Mpa | Vertically | ≥11 | 12.6 | Test speed 500mm/min |
| Laterally | ≥11 | 11.8 | ||
| Drop-dart impact test g | The two sides | ≥500 | 550 | Staircase method |
| Flanging | ≥300 | 320 | ||
| Coefficient of friction | Vertically | 0.4～0.6 | 0.52 | Test speed 100mm/min |
| Laterally | 0.4～0.6 | 0.46 | ||
| 90 ℃ of elongation % | Vertically | ≤20 | 18 | Test membrane sample width is 25mm, and length is 50mm; Test weight is 500g; 1 hour testing time, 90 ℃ of temperature. |
| Laterally | ≤40 | 33 |
Claims (5)
1. a multilayer packing membrane is characterized in that: comprise three layers: skin, middle level, internal layer; Its thickness proportion is between 1: 1: 1 to 1: 3: 1; Described skin is by LLDPE, low density polyethylene (LDPE), and smooth masterbatch, antistatic master batch forms; Described middle level is by LLDPE, high density polyethylene (HDPE), and brightening mother particle forms; Described internal layer is by LLDPE, low density polyethylene (LDPE), and the opening masterbatch forms.
2. multilayer packing membrane according to claim 1, it is characterized in that: the thickness proportion of skin, middle level, internal layer is 1: 2: 1.
3. multilayer packing membrane according to claim 1 and 2, it is characterized in that: the mass percent of the LLDPE in the described skin, low density polyethylene (LDPE), smooth masterbatch and antistatic master batch is: 60.0～75.0,35.0～20.0,2.5,2.5; The mass percent of the LLDPE in the described middle level, high density polyethylene (HDPE) and brightening mother particle is: 60.0～75.0,35.0～20.0,5.0; LLDPE in the described internal layer, low density polyethylene (LDPE) and opening masterbatch mass percent are: 60.0～75.0,37.5～22.5,2.5.
4. multilayer packing membrane according to claim 3, it is characterized in that: the molten finger g/10min of described LLDPE is 0.2～1.2, density g/cm30.90～0.94;
Low density polyethylene (LDPE) in the described skin is molten to refer to that g/10min is 0.2～1.2, density g/cm30.90～0.94;
Low density polyethylene (LDPE) in the described internal layer is molten to refer to that g/10min is 0.2～1.2, density g/cm30.90～0.94;
The molten finger g/10min of described smooth masterbatch is 0.1～9.0, density g/cm30.90～1.05;
The molten finger g/10min of described antistatic master batch is 10.1～16.0, density g/cm30.90～1.05;
The molten finger g/10min of described high density polyethylene (HDPE) is 0.2～1.2, density g/cm30.94～0.96;
The molten finger g/10min of described brightening mother particle is 0.2～10.2, density g/cm30.90～1.05;
The molten finger g/10min of described opening masterbatch is 0.2～10.0, density g/cm30.95～1.05.
5. a manufacture method as claimed in claim 1 realizes by following steps:
Be that 60.0～75.0,35.0～20.0,2.5,2.5 proportioning is sent into the First extruder and plastified under 170～220 ℃ condition and extrude processing extruding mean temperature with the LLDPE in the skin, low density polyethylene (LDPE), smooth masterbatch, antistatic master batch according to mass percent;
Be that 60.0～75.0,35.0～20.0,5.0 proportioning is sent into second extruder and plastified under 170～220 ℃ condition and extrude processing extruding mean temperature with the LLDPE in the middle level, high density polyethylene (HDPE), brightening mother particle according to mass percent;
With the LLDPE in the internal layer, low density polyethylene (LDPE) and opening masterbatch are that 60.0～75.0,37.5～22.5,2.5 proportioning is sent into the 3rd extruder and plastified under 170～220 ℃ condition and extrude processing extruding mean temperature according to mass percent;
The batching of three extruders is delivered to die head, under 200～220 ℃ operating temperature, difference film forming middle level, internal layer and skin;
Extruded by die head by artificial draping mechanism;
The cooling-air that is controlled at below 25 ℃ through temperature propels the price of the film forming bubble, and the film bubble is outside to be cooled off by cooling vane, is cooled off by the multiple tracks cooling-air in the film bubble, and on film bubble top hot-air is taken away;
But by the cooling-air air inflow controlling diaphragm bubble of adjusting the film bubble be stabilized under certain air pressure (～0.3bar), reach propelling the price of than requiring of setting;
The film bubble enters stable bubble frame behind cooling vane, carry out the measurement of vesicle diameter and thickness distribution by the 360 degree rotations of film bubble measuring instrument, and feed back to regulating system, in time rectifies a deviation by the fine setting cooling air quantity, realizes at last the regulation and control of film thickness;
The film bubble enters man-like shelf, and man-like shelf is done 360 degree rotations with the rotation traction traction platform in order to the inhomogeneities of thickness is distributed on the circumference of whole film bubble;
Film enters one group of horizontal reversing roller of top behind carry-over pinch rolls, realize the commutation of film;
Film imports corona treatment plant again to remove static behind deflector roll, enter winder mechanism and carry out rolling, sets when requiring when the film coil diameter reaches, and automatically cuts;
Film after the rolling through unreel, print, dry, embossing and flanging process after again rolling;
The protection polybag that has anti-ultraviolet function on the film volume outer cover, and after pack with plank or hardboard etc. at two ends is transported into the warehouse for finished product piling or directly loads and transports to the user.
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| CN2545121Y (en) * | 2002-06-03 | 2003-04-16 | 穆在洋 | Composite polyethylene packaging film structure |
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