CN102729565A - Three-layer coextrusion plastic fertilizer packaging bag - Google Patents
Three-layer coextrusion plastic fertilizer packaging bag Download PDFInfo
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- CN102729565A CN102729565A CN2012101824372A CN201210182437A CN102729565A CN 102729565 A CN102729565 A CN 102729565A CN 2012101824372 A CN2012101824372 A CN 2012101824372A CN 201210182437 A CN201210182437 A CN 201210182437A CN 102729565 A CN102729565 A CN 102729565A
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Abstract
The invention discloses a three-layer coextrusion plastic fertilizer packaging bag. The bag comprises an inner layer plastic film, a middle layer plastic film and an outer layer plastic film and is prepared through a three-layer coextrusion film blowing technology, wherein the raw material of the inner layer plastic film is selected from polyethylene (PE); and raw materials of the outer layer and middle layer plastic films are selected from mixtures of polypropylene (PP), the PE and a propylene-based elastomer. The PP and the propylene-based elastomer exist in the outer layer and middle layer materials, and the inner layer material is the PE, so the compatibility between the PP and the PE is improved, thereby the packaging bag prepared in the invention has a higher heat-sealing peeling strength than bags prepared from other PP-PE coextrusion films, has an enhanced packaging fastness, an enhanced seal moisture resistance and an enhanced heat-sealing pollution resistance, and allows shelf lives of products stored in the bag of the invention to be longer than that of products stored in plastic woven packaging bags; the bag of the invention has the advantages of good heat resistance, good tensile strength and good creep resistance, can adapt to high loading temperatures and does not deform when stacking is carried out after hot loading; and the bag of the invention is lighter than three-layer coextrusion PE film bags with a same thickness, so the bag of the invention can be widely applied to the packaging industry, and is especially suitable for fertilizer packaging.
Description
Technical field
The invention belongs to the packing technique field, be specifically related to a kind of fertilizer packaging bag.
Background technology
The fertilizer packaging bag is generally the Polywoven Bag or the three-layer co-extruded PE film bag of band inner membrance, the external three-layer co-extruded PE film bags that adopt, the domestic Polywoven Bags that adopt the band inner membrance more more.Because Polywoven Bag sealed damp-proof property is poor, and incompatible big industrial production automation can requirement, will be replaced by three-layer co-extruded film bag gradually.China has brought into use three-layer co-extruded PE film bag at present; But since loading and unloading, traffic condition and the storage use habit of China with abroad exist than big-difference; In addition the chemical fertilizer product from manufacturing enterprise to end user's hand in the transportation number of turnover a lot; Hot strength, the creep-resistant property of three-layer co-extruded PE film bag are limited, and the situation of broken bag happens occasionally.
In addition, the process characteristic of China's fertilizer enterprises is that the temperature during finished product chemical fertilizer (for example urea) pack is about 80 ℃; The normal serviceability temperature that has surpassed three-layer co-extruded PE film bag; High temperature during the chemical fertilizer can makes packaging bag stretcher strain when pile, and intensity descends, and broken bag rate is higher.
Have again; Owing to have dust (for example having carbamide dust in the urea granules) inevitably in the finished product chemical fertilizer; These dust can pollute the heat seal face that three-layer co-extruded PE film bag seals, when the packaging bag heat sealing, and the bond strength variation of heat seal face; Or the combination imprecision, also be a major reason that causes brokenly bag.
Slight broken bag for example seals the heat seal imprecision can cause fertilizer moisture absorption caking, and fertilizer efficiency runs off, and the shelf-life shortens.Serious broken bag can make the fertilizer Bales Off, can't store, transport.
Summary of the invention
The technical problem that the present invention solved is the deficiency that overcomes three-layer co-extruded PE film bag; A kind of have higher tensile strength and creep-resistant property are provided; Simultaneously can adapt to the can high temperature about 80 ℃, anti-dust dirt property is good, seal the high three-layer co-extruded plastic foil fertilizer packaging bag of bond strength.
Realize that technical scheme of the present invention is:
A kind of three-layer co-extruded plastic foil fertilizer packaging bag; Have inner plastic film, intercellar layer plastics film, outer layer plastic film; Adopt three-layer co-extruded film-blowing process to process; The raw material of said inner plastic film is selected from polyethylene, and the raw material of said skin and intercellar layer plastics film is selected the mixture of polypropylene, polyethylene, propylene-based elastomeric for use.
The polyethylene raw material of said inner plastic film is polyethylene, the low density polyethylene (LDPE) compound of LLDPE, metallocene catalysis, and its weight percentage is:
LLDPE 15%-80%
The polyethylene 15%-80% of metallocene catalysis
Low density polyethylene (LDPE) 5%-20%.
The pp material of said skin and intercellar layer plastics film is selected COPP for use; The polyethylene raw material is selected the polyethylene compound of LLDPE, metallocene catalysis for use; Propylene-based elastomeric is selected the propylene-based elastomeric of alpha-olefin content 5%-16% for use, and its weight percentage is:
COPP 10%-60%
LLDPE 0%-50%
The polyethylene 10%-60% of metallocene catalysis
Propylene-based elastomeric 5%-15%.
As a kind of preferred version, the polyethylene raw material of said inner plastic film is the polyethylene of LLDPE, metallocene catalysis, low density polyethylene (LDPE) compound, and its weight percentage is:
LLDPE 35%
The polyethylene 55% of metallocene catalysis
Low density polyethylene (LDPE) 10%.
The pp material of said skin and intercellar layer plastics film is selected COPP for use; The polyethylene raw material is selected the polyethylene compound of LLDPE, metallocene catalysis for use; Propylene-based elastomeric is selected the propylene-based elastomeric of alpha-olefin content 5%-16% for use, and its weight percentage is:
COPP 20%
LLDPE 20%
The polyethylene 50% of metallocene catalysis
Propylene-based elastomeric 10%.
As another kind of preferred version, the polyethylene raw material of said inner plastic film is the polyethylene of LLDPE, metallocene catalysis, low density polyethylene (LDPE) compound, and its weight percentage is:
LLDPE 35%
The polyethylene 55% of metallocene catalysis
Low density polyethylene (LDPE) 10%.
The pp material of said skin and intercellar layer plastics film is selected COPP for use; The polyethylene raw material is selected the polyethylene compound of LLDPE, metallocene catalysis for use; Propylene-based elastomeric is selected the propylene-based elastomeric of alpha-olefin content 5%-16% for use, and its weight percentage is:
COPP 35%
LLDPE 30%
The polyethylene 25% of metallocene catalysis
Propylene-based elastomeric 10%.
Can also add color master-batch in the said intercellar layer plastics pleurodiaphragmatic in terspace material, its addition is 1% to 10% of an intercellar layer plastics pleurodiaphragmatic in terspace material weight.
Thickness between three layers of above-mentioned inner plastic film, intercellar layer plastics film and the outer layer plastic films is than being 1:1:1 to 1:3:1, and the gross thickness of co-extrusion film is 100 μ m to 200 μ m.
The invention has the beneficial effects as follows:
1, owing in outer and the middle layer material polypropylene and propylene-based elastomeric are arranged; Inner layer material is a polyethylene; Such heat-sealing temperature gradient and propylene-based elastomeric have improved polypropylene and poly compatibility; The heat seal strength of feasible packaging bag of processing is higher than other PP-PE co-extrusion film, has strengthened the fastness of packing.
2, sealed damp-proof property is good, and the heat-sealing pollution resistance is good, and the shelf-life, comparable moulding compiled fertilizer packaging bag prolongation 1-2 doubly.
3, have than higher hear resistance, tensile strength, the creep-resistant property of three-layer co-extruded PE film bag, can adapt to can high temperature and the hot filling about 80 ℃ after pile indeformable.
4, than the more lightweight of three-layer co-extruded PE film bag of condition of equivalent thickness, be fit to promote the use of.
Below for embodying the experiment contrast table of beneficial effect
Description of drawings
Fig. 1 is the structural representation of this fertilizer packaging bag.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is done further explanation.
As shown in Figure 1: three-layer co-extruded plastic foil fertilizer packaging bag of the present invention; Its three-layer co-extruded membrane structure comprises inner plastic film 1, intercellar layer plastics film 2 and outer layer plastic film 3; Wherein inner plastic film 1 is a hot sealing layer; Outer layer plastic film 3 is a functional layer with intercellar layer plastics film 2, and outer layer plastic film 3 is held concurrently and is printing and skid resistant course simultaneously.It is primary raw material that inner plastic film 1 adopts the polyethylene and the low density polyethylene (LDPE) of LLDPE, metallocene catalysis; The polyethylene of outer layered material 3 and middle level 2 employing COPPs, LLDPE, metallocene catalysis, alpha-olefin content is that the propylene-based elastomeric of 5%-16% is a primary raw material.Extrude and pass through shared die head blown film through three extruders and form three-layer co-extruded film.
The raw material of said inner plastic film is selected from polyethylene, and the raw material of said skin and intercellar layer plastics film is selected the mixture of polypropylene, polyethylene, propylene-based elastomeric for use.
The polyethylene raw material of said inner plastic film is polyethylene, the low density polyethylene (LDPE) compound of LLDPE, metallocene catalysis, and its weight percentage is:
LLDPE 15%-80%
The polyethylene 15%-80% of metallocene catalysis
Low density polyethylene (LDPE) 5%-20%.
The pp material of said skin and intercellar layer plastics film is selected COPP for use; The polyethylene raw material is selected the polyethylene compound of LLDPE, metallocene catalysis for use; Propylene-based elastomeric is selected the propylene-based elastomeric of alpha-olefin content 5%-16% for use, and its weight percentage is:
COPP 10%-60%
LLDPE 0%-50%
The polyethylene 10%-60% of metallocene catalysis
Propylene-based elastomeric 5%-15%.
Embodiment one
One, batching
The polyethylene raw material of inner plastic film is selected polyethylene, the low density polyethylene (LDPE) compound of LLDPE, metallocene catalysis for use, and its weight percentage is:
LLDPE 35%
The polyethylene 55% of metallocene catalysis
Low density polyethylene (LDPE) 10%.
Pp material outer and the intercellar layer plastics film is selected COPP for use; The polyethylene raw material is selected the polyethylene compound of LLDPE, metallocene catalysis for use; Propylene-based elastomeric is selected the propylene-based elastomeric of alpha-olefin content 5%-16% for use, and its weight percentage is:
COPP 20%
LLDPE 20%
The polyethylene 50% of metallocene catalysis
Propylene-based elastomeric 10%.
Two, blown film
After the internal layer for preparing, skin, middle level raw material sent into three extruder fusions respectively, form three-layer co-extruded film through the co-extrusion die head blown film, this film be a film.
Three, identify at tube film surface printing product.
Four,, with an end opening heat seal of tube film section, process packaging bag again with the segment of tube film.
Embodiment two
One, batching
The polyethylene raw material of inner plastic film is polyethylene, the low density polyethylene (LDPE) compound of LLDPE, metallocene catalysis, and its weight percentage is:
LLDPE 35%
The polyethylene 55% of metallocene catalysis
Low density polyethylene (LDPE) 10%.
Pp material outer and the intercellar layer plastics film is selected COPP for use; The polyethylene raw material is selected the polyethylene compound of LLDPE, metallocene catalysis for use; Propylene-based elastomeric is selected the propylene-based elastomeric of alpha-olefin content 5%-16% for use, and its weight percentage is:
COPP 35%
LLDPE 30%
The polyethylene 25% of metallocene catalysis
Propylene-based elastomeric 10%.
Two, blown film
After the internal layer for preparing, skin, middle level raw material sent into three extruder fusions respectively, form three-layer co-extruded film through the co-extrusion die head blown film, this film be a film.
Three, identify at tube film surface printing product.
Four,, with an end opening heat seal of tube film section, process packaging bag again with the segment of tube film.
In the foregoing description one, two, can in intercellar layer plastics pleurodiaphragmatic in terspace material, add color masterbatch, its addition is 1% to 10% of an intercellar layer plastics pleurodiaphragmatic in terspace material weight.Like this, on the one hand, can reduce the light transmittance of packaging bag, avoid chemical fertilizer rotten because of illumination; On the other hand, also make the product of packaging bag surface printing identify clear eye-catching.
This three-layer co-extruded film is a blowfilm shaping; Gross thickness is generally all between 100 μ m to 200 μ m; The fertilizer packaging bag of processing with it is different to mould compiles the fertilizer packaging bag, and moulding and compiling the fertilizer packaging bag is network structure, and outer bag has the routing pin hole up and down; The thickness of inner bag PE film is generally about 50 μ m, and sealed damp-proof property and barrier are poorer than the fertilizer packaging bag of processing with above-mentioned three-layer co-extruded film.So the fertilizer efficiency that the fertilizer packaging bag of processing with above-mentioned three-layer co-extruded film is packed loss still less, prolonged the use shelf-life of chemical fertilizer.
Because the membrane structure of this three-layer co-extruded film; Be in outer membrane 3 and the mesopelagic layer 2 polypropylene and propylene-based elastomeric to be arranged; Inner layer film 1 be polyethylene; Such heat-sealing temperature gradient and propylene-based elastomeric have improved polypropylene and poly compatibility, and other PP-PE co-extrusion film of the heat sealing strength ratio of feasible packaging bag of processing is high, have strengthened the fastness of packaging bag enclosing.
Also have, polypropylene hear resistance and deflection are superior to polyethylene, and the used COPP heat distortion temperature of the present invention can adapt to the can high temperature about 80 ℃ about 100 ℃, and pile is indeformable after guaranteeing hot filling.Simultaneously polypropylene density is lower than polyethylene, makes the more lightweight of three-layer co-extruded PE film bag than condition of equivalent thickness of film bag that this three-layer co-extruded film processes.
In addition, polyacrylic intensity is higher than polyethylene, makes this three-layer co-extruded film have than the better tensile strength of three-layer co-extruded PE film.The polyethylene that contains polypropylene, propylene-based elastomeric, metallocene catalysis in the three-decker; Propylene-based elastomeric has improved polyacrylic black brittleness; The polyethylene low temperature impact properties of metallocene catalysis is excellent, anti tear and the anti-intensity height that pierces through, and the heat-sealing pollution resistance is good.Loading and unloading, traffic condition and the storage use habit that can adapt to China with this three-layer co-extruded film as the fertilizer packaging bag.
Claims (6)
1. three-layer co-extruded plastic foil fertilizer packaging bag; Have inner plastic film, intercellar layer plastics film, outer layer plastic film; Adopt three-layer co-extruded film-blowing process to process; It is characterized in that the raw material of said inner plastic film is selected from polyethylene, the raw material of said skin and intercellar layer plastics film is selected the mixture of polypropylene, polyethylene, propylene-based elastomeric for use.
2. three-layer co-extruded plastic foil fertilizer packaging bag according to claim 1; It is characterized in that; The polyethylene raw material of said inner plastic film is polyethylene, the low density polyethylene (LDPE) compound of LLDPE, metallocene catalysis, and its weight percentage is:
LLDPE 15%-80%
The polyethylene 15%-80% of metallocene catalysis
Low density polyethylene (LDPE) 5%-20%;
The pp material of said skin and intercellar layer plastics film is selected COPP for use; The polyethylene raw material is selected the polyethylene compound of LLDPE, metallocene catalysis for use; Propylene-based elastomeric is selected the propylene-based elastomeric of alpha-olefin content 5%-16% for use, and its weight percentage is:
COPP 10%-60%
LLDPE 0%-50%
The polyethylene 10%-60% of metallocene catalysis
Propylene-based elastomeric 5%-15%.
3. three-layer co-extruded plastic foil fertilizer packaging bag according to claim 1; It is characterized in that; The polyethylene raw material of said inner plastic film is polyethylene, the low density polyethylene (LDPE) compound of LLDPE, metallocene catalysis, and its weight percentage is:
LLDPE 35%
The polyethylene 55% of metallocene catalysis
Low density polyethylene (LDPE) 10%;
The pp material of said skin and intercellar layer plastics film is selected COPP for use; The polyethylene raw material is selected the polyethylene compound of LLDPE, metallocene catalysis for use; Propylene-based elastomeric is selected the propylene-based elastomeric of alpha-olefin content 5%-16% for use, and its weight percentage is:
COPP 20%
LLDPE 20%
The polyethylene 50% of metallocene catalysis
Propylene-based elastomeric 10%.
4. three-layer co-extruded plastic foil fertilizer packaging bag according to claim 1; It is characterized in that; The polyethylene raw material of said inner plastic film is polyethylene, the low density polyethylene (LDPE) compound of LLDPE, metallocene catalysis, and its weight percentage is:
LLDPE 35%
The polyethylene 55% of metallocene catalysis
Low density polyethylene (LDPE) 10%;
The pp material of said skin and intercellar layer plastics film is selected COPP for use; The polyethylene raw material is selected the polyethylene compound of LLDPE, metallocene catalysis for use; Propylene-based elastomeric is selected the propylene-based elastomeric of alpha-olefin content 5%-16% for use, and its weight percentage is:
COPP 35%
LLDPE 30%
The polyethylene 25% of metallocene catalysis
Propylene-based elastomeric 10%.
5. three-layer co-extruded plastic foil fertilizer packaging bag according to claim 1 is characterized in that, can also add color master-batch in the said intercellar layer plastics pleurodiaphragmatic in terspace material, and its addition is 1% to 10% of an intercellar layer plastics pleurodiaphragmatic in terspace material weight.
6. three-layer co-extruded plastic foil fertilizer packaging bag according to claim 1 is characterized in that, the thickness between three layers of said inner plastic film, intercellar layer plastics film and the outer layer plastic films is than being 1:1:1 to 1:3:1, and the gross thickness of co-extrusion film is 100 μ m to 200 μ m.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103481620A (en) * | 2013-08-23 | 2014-01-01 | 吴江市英力达塑料包装有限公司 | PE (Poly Ethylene) liquid packaging film and preparation method thereof |
| CN103640301A (en) * | 2013-12-18 | 2014-03-19 | 蚌埠蓝天塑料包装有限公司 | Anti-caking hygroscopic polyethylene membrane packaging bag and preparation method thereof |
| CN106947155A (en) * | 2017-04-17 | 2017-07-14 | 合肥市维果包装设计有限公司 | A kind of degradable food pack |
| CN106977818A (en) * | 2017-04-17 | 2017-07-25 | 合肥市维果包装设计有限公司 | A kind of environmentally-friendly plastic packaging bag |
| CN107458736A (en) * | 2017-08-31 | 2017-12-12 | 重庆市永川区天堂化工厂 | The packaging bag of chemical fertilizer granule anti-caking |
| CN108973232A (en) * | 2018-07-20 | 2018-12-11 | 长兴江美包装有限公司 | A kind of FFS runner exhaust packaging bag production technology |
| CN109367180A (en) * | 2018-10-16 | 2019-02-22 | 福建师范大学福清分校 | One kind exempting from primary coat VOC free s discharge pre-coating film base material film and preparation method thereof |
| CN111661472A (en) * | 2020-05-14 | 2020-09-15 | 慈溪市和达塑料制品有限公司 | Flat-bottom sealed garbage bag and manufacturing method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103481620A (en) * | 2013-08-23 | 2014-01-01 | 吴江市英力达塑料包装有限公司 | PE (Poly Ethylene) liquid packaging film and preparation method thereof |
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| CN103640301A (en) * | 2013-12-18 | 2014-03-19 | 蚌埠蓝天塑料包装有限公司 | Anti-caking hygroscopic polyethylene membrane packaging bag and preparation method thereof |
| CN106947155A (en) * | 2017-04-17 | 2017-07-14 | 合肥市维果包装设计有限公司 | A kind of degradable food pack |
| CN106977818A (en) * | 2017-04-17 | 2017-07-25 | 合肥市维果包装设计有限公司 | A kind of environmentally-friendly plastic packaging bag |
| CN107458736A (en) * | 2017-08-31 | 2017-12-12 | 重庆市永川区天堂化工厂 | The packaging bag of chemical fertilizer granule anti-caking |
| CN108973232A (en) * | 2018-07-20 | 2018-12-11 | 长兴江美包装有限公司 | A kind of FFS runner exhaust packaging bag production technology |
| CN108973232B (en) * | 2018-07-20 | 2020-01-07 | 长兴江美包装有限公司 | Production process of FFS (fan filter) runner exhaust packaging bag |
| CN109367180A (en) * | 2018-10-16 | 2019-02-22 | 福建师范大学福清分校 | One kind exempting from primary coat VOC free s discharge pre-coating film base material film and preparation method thereof |
| CN111661472A (en) * | 2020-05-14 | 2020-09-15 | 慈溪市和达塑料制品有限公司 | Flat-bottom sealed garbage bag and manufacturing method thereof |
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| CN102729565B (en) | 2014-12-17 |
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