CN102729565B - Three-layer coextrusion plastic fertilizer packaging bag - Google Patents
Three-layer coextrusion plastic fertilizer packaging bag Download PDFInfo
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- CN102729565B CN102729565B CN201210182437.2A CN201210182437A CN102729565B CN 102729565 B CN102729565 B CN 102729565B CN 201210182437 A CN201210182437 A CN 201210182437A CN 102729565 B CN102729565 B CN 102729565B
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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 packing technique field, be specifically related to a kind of fertilizer packaging bag.
Background technology
Fertilizer packaging bag is generally the Polywoven Bag of band inner membrance or three-layer co-extruded PE film bag, the three-layer co-extruded PE film bag of external many employings, the domestic Polywoven Bag adopting band inner membrance more.Because Polywoven Bag sealed damp-proof is poor, and be not suitable with the filling requirement of large industrial production automation, will be replaced by three-layer extrusion film bag gradually.China has brought into use three-layer co-extruded PE film bag at present, but due to the handling of China, traffic condition and storage use habit with there is larger difference abroad, in addition chemical fertilizer products from manufacturing enterprise to end user's hand to transport the 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, temperature when finished product chemical fertilizer (such as urea) packs is at about 80 DEG C, exceed the normal serviceability temperature of three-layer co-extruded PE film bag, high temperature when chemical fertilizer is filling makes packaging bag stretcher strain when pile, and intensity declines, and broken bag rate is higher.
Have again, due in finished product chemical fertilizer inevitably with dust (with carbamide dust in such as urea granules), these dust can pollute the heat seal face of three-layer co-extruded PE film bag sealing, when packaging bag heat sealing, the bond strength in heat seal face is deteriorated, or in conjunction with imprecision, be also the major reason causing broken bag.
Slight broken bag is such as sealed heat seal imprecision and the fertilizer moisture absorption can be caused to lump, and fertilizer efficiency runs off, shortened shelf life.Serious broken bag can make fertilizer Bales Off, cannot store, transport.
Summary of the invention
Technical problem solved by the invention is the deficiency overcoming three-layer co-extruded PE film bag, there is provided a kind of and there is higher tensile strength and creep-resistant property, the filling high temperature of about 80 DEG C can be adapted to, dustiness good, the three-layer co-extruded plastic film fertilizer packaging bag that sealing bond strength is high of anti-powder simultaneously.
Realizing technical scheme of the present invention is:
A kind of three-layer co-extruded plastic film fertilizer packaging bag, there is inner plastic film, intercellar layer plastics film, outer layer plastic film, three-layer co-extruded film-blowing process is adopted to make, the raw material of described inner plastic film is selected from polyethylene, the mixture of the raw material choose polypropylene of described skin and intercellar layer plastics film, polyethylene, propylene-based elastomeric.
The polyethylene raw material of described inner plastic film is LLDPE, the polyethylene of metallocene catalysis, low density polyethylene (LDPE) compound, 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 described skin and intercellar layer plastics film selects COPP, polyethylene raw material selects the polyethylene compound of LLDPE, metallocene catalysis, propylene-based elastomeric selects the propylene-based elastomeric of alpha-olefin content 5%-16%, 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 described inner plastic film is LLDPE, the polyethylene of 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 described skin and intercellar layer plastics film selects COPP, polyethylene raw material selects the polyethylene compound of LLDPE, metallocene catalysis, propylene-based elastomeric selects the propylene-based elastomeric of alpha-olefin content 5%-16%, 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 described inner plastic film is LLDPE, the polyethylene of 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 described skin and intercellar layer plastics film selects COPP, polyethylene raw material selects the polyethylene compound of LLDPE, metallocene catalysis, propylene-based elastomeric selects the propylene-based elastomeric of alpha-olefin content 5%-16%, 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 described intercellar layer plastics film raw material, its addition is 1% to 10% of intercellar layer plastics film raw material weight.
Thickness Ratio between above-mentioned inner plastic film, intercellar layer plastics film and outer layer plastic film three layers is 1:1:1 to 1:3:1, and the gross thickness of co-extrusion film is 100 μm to 200 μm.
The invention has the beneficial effects as follows:
1, owing to having polypropylene and propylene-based elastomeric in outer and middle layer material, inner layer material is polyethylene, such heat-sealing temperature gradient and propylene-based elastomeric improve polypropylene and poly compatibility, make the heat seal strength of the packaging bag of making higher than other PP-PE co-extrusion film, enhance the fastness of packaging.
2, sealed damp-proof is good, and heat-sealing pollution resistance is good, and the shelf-life, comparable moulding compiled fertilizer packaging bag prolongation 1-2 doubly.
3, have heat resistance, tensile strength, the creep-resistant property higher than three-layer co-extruded PE film bag, after adapting to the filling high temperature of about 80 DEG C and hot filling, pile is indeformable.
4, than the three-layer co-extruded PE film bag more lightweight of condition of equivalent thickness, be applicable to promoting the use of.
Below for embodying the experiment contrast table of beneficial effect
Accompanying drawing explanation
Fig. 1 is the structural representation of this fertilizer packaging bag.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described further.
As shown in Figure 1: three-layer co-extruded plastic film 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 hot sealing layer, outer layer plastic film 3 and intercellar layer plastics film 2 are functional layer, and outer layer plastic film 3 is held concurrently as printing and skid resistant course simultaneously.Inner plastic film 1 adopts the polyethylene of LLDPE, metallocene catalysis and low density polyethylene (LDPE) to be primary raw material; Outer layered material 3 and middle level 2 adopt the polyethylene of COPP, LLDPE, metallocene catalysis, and alpha-olefin content is the propylene-based elastomeric of 5%-16% is primary raw material.Extruded by three extruders and pass through the die head blown film shared and form three-layer extrusion film.
The raw material of described inner plastic film is selected from polyethylene, the mixture of the raw material choose polypropylene of described skin and intercellar layer plastics film, polyethylene, propylene-based elastomeric.
The polyethylene raw material of described inner plastic film is LLDPE, the polyethylene of metallocene catalysis, low density polyethylene (LDPE) compound, 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 described skin and intercellar layer plastics film selects COPP, polyethylene raw material selects the polyethylene compound of LLDPE, metallocene catalysis, propylene-based elastomeric selects the propylene-based elastomeric of alpha-olefin content 5%-16%, 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, prepare burden
The polyethylene raw material of inner plastic film selects 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 that is outer and intercellar layer plastics film selects COPP, polyethylene raw material selects the polyethylene compound of LLDPE, metallocene catalysis, propylene-based elastomeric selects the propylene-based elastomeric of alpha-olefin content 5%-16%, 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 prepared, skin, middle level raw material are sent into three extruder meltings respectively, form three-layer extrusion film through co-extrusion die head blown film, this film is cylinder film.
Three, at cylinder film surface printing product identification.
Four, by the segment of cylinder film, then by the one end open heat seal of cylinder film section, packaging bag is made.
embodiment two
One, prepare burden
The polyethylene raw material of inner plastic film is LLDPE, the polyethylene of 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%.
Pp material that is outer and intercellar layer plastics film selects COPP, polyethylene raw material selects the polyethylene compound of LLDPE, metallocene catalysis, propylene-based elastomeric selects the propylene-based elastomeric of alpha-olefin content 5%-16%, 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 prepared, skin, middle level raw material are sent into three extruder meltings respectively, form three-layer extrusion film through co-extrusion die head blown film, this film is cylinder film.
Three, at cylinder film surface printing product identification.
Four, by the segment of cylinder film, then by the one end open heat seal of cylinder film section, packaging bag is made.
In above-described embodiment one, two, can add color masterbatch in intercellar layer plastics film raw material, its addition is 1% to 10% of intercellar layer plastics film raw material weight.Like this, on the one hand, the light transmittance of packaging bag can be reduced, avoid chemical fertilizer because of illumination go bad; On the other hand, also make the product identification of packaging bag surface printing clear eye-catching.
This three-layer extrusion film is a blowfilm shaping, gross thickness is general all between 100 μm to 200 μm, the fertilizer packaging bag made with it is different to mould compiles fertilizer packaging bag, moulding and compiling fertilizer packaging bag is network structure, outer bag has routing pin hole up and down, the thickness of inner bag PE film is generally about 50 μm, and the fertilizer packaging bag that sealed damp-proof and barrier ratio are made with above-mentioned three-layer extrusion film is poor.So lose less with the fertilizer efficiency that the fertilizer packaging bag that above-mentioned three-layer extrusion film is made is packed, extend the use shelf-life of chemical fertilizer.
Due to the membrane structure of this three-layer extrusion film, namely polypropylene and propylene-based elastomeric is had in outer membrane 3 and mesopelagic layer 2, inner layer film 1 be polyethylene, such heat-sealing temperature gradient and propylene-based elastomeric improve polypropylene and poly compatibility, make other PP-PE co-extrusion film of the heat sealing strength ratio of the packaging bag of making high, enhance the fastness of packaging bag enclosing.
Further, polypropylene heat resistance and deflection are better than polyethylene, and the present invention's COPP heat distortion temperature used, at about 100 DEG C, can adapt to the filling high temperature of about 80 DEG C, and after guaranteeing hot filling, pile is indeformable.Polypropylene density is lower than polyethylene simultaneously, and the film bag that this three-layer extrusion film is made is than the three-layer co-extruded PE film bag more lightweight of condition of equivalent thickness.
In addition, polyacrylic intensity, higher than polyethylene, makes this three-layer extrusion film have tensile strength more better than three-layer co-extruded PE film.Polyethylene containing polypropylene, propylene-based elastomeric, metallocene catalysis in three-decker, propylene-based elastomeric improves polyacrylic black brittleness, the polyethylene low temperature impact properties of metallocene catalysis is excellent, tear-proof and anti-puncture intensity high, heat-sealing pollution resistance is good.The handling of China, traffic condition and storage use habit can be adapted to as fertilizer packaging bag with this three-layer extrusion film.
Claims (5)
1. a three-layer co-extruded plastic film fertilizer packaging bag, there is inner plastic film, intercellar layer plastics film, outer layer plastic film, three-layer co-extruded film-blowing process is adopted to make, the raw material of described inner plastic film is selected from polyethylene, the mixture of the raw material choose polypropylene of described skin and intercellar layer plastics film, polyethylene, propylene-based elastomeric; It is characterized in that, the polyethylene raw material of described inner plastic film is LLDPE, the polyethylene of metallocene catalysis, low density polyethylene (LDPE) compound, 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 described skin and intercellar layer plastics film selects COPP, polyethylene raw material selects the polyethylene compound of LLDPE, metallocene catalysis, propylene-based elastomeric selects the propylene-based elastomeric of alpha-olefin content 5%-16%, and its weight percentage is:
COPP 10%-60%
LLDPE 0%-50%
The polyethylene 10%-60% of metallocene catalysis
Propylene-based elastomeric 5%-15%.
2. three-layer co-extruded plastic film fertilizer packaging bag according to claim 1, it is characterized in that, the polyethylene raw material of described inner plastic film is LLDPE, the polyethylene of 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 described skin and intercellar layer plastics film selects COPP, polyethylene raw material selects the polyethylene compound of LLDPE, metallocene catalysis, propylene-based elastomeric selects the propylene-based elastomeric of alpha-olefin content 5%-16%, and its weight percentage is:
COPP 20%
LLDPE 20%
The polyethylene 50% of metallocene catalysis
Propylene-based elastomeric 10%.
3. three-layer co-extruded plastic film fertilizer packaging bag according to claim 1, it is characterized in that, the polyethylene raw material of described inner plastic film is LLDPE, the polyethylene of 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 described skin and intercellar layer plastics film selects COPP, polyethylene raw material selects the polyethylene compound of LLDPE, metallocene catalysis, propylene-based elastomeric selects the propylene-based elastomeric of alpha-olefin content 5%-16%, and its weight percentage is:
COPP 35%
LLDPE 30%
The polyethylene 25% of metallocene catalysis
Propylene-based elastomeric 10%.
4. three-layer co-extruded plastic film fertilizer packaging bag according to claim 1, is characterized in that, also adds color master-batch in described intercellar layer plastics film raw material, and its addition is 1% to 10% of intercellar layer plastics film raw material weight.
5. three-layer co-extruded plastic film fertilizer packaging bag according to claim 1, is characterized in that, the Thickness Ratio between described inner plastic film, intercellar layer plastics film and outer layer plastic film three layers is 1:1:1 to 1:3:1, and the gross thickness of co-extrusion film is 100 μm to 200 μm.
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| CN201210182437.2A CN102729565B (en) | 2012-06-05 | 2012-06-05 | Three-layer coextrusion plastic fertilizer packaging bag |
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| CN201210182437.2A CN102729565B (en) | 2012-06-05 | 2012-06-05 | Three-layer coextrusion plastic fertilizer packaging bag |
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| CN102729565B true CN102729565B (en) | 2014-12-17 |
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| CN103481620B (en) * | 2013-08-23 | 2015-07-22 | 苏州新奇迅网络有限公司 | PE (Poly Ethylene) liquid packaging film and preparation method thereof |
| CN103640301B (en) * | 2013-12-18 | 2015-09-16 | 蚌埠天成包装材料有限公司 | A kind of anti-caking is from moisture absorption PE-PP composite waterproofing membrane bag and preparation method thereof |
| 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 |
| 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 |
| 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 |
| 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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| CN201296431Y (en) * | 2008-12-03 | 2009-08-26 | 苏州市合兴食品有限公司 | Self-sealing condiment packaging bag |
| CN201390005Y (en) * | 2009-04-07 | 2010-01-27 | 江阴宝柏新型包装材料有限公司 | Polypropylene-polyethylene co-extruded and blown film |
| CN101954756A (en) * | 2010-08-12 | 2011-01-26 | 东莞市长盈塑料编织包装有限公司 | Manufacturing method of composite package |
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Patent Citations (4)
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| US4868025A (en) * | 1987-08-28 | 1989-09-19 | Packaging Industries Group, Inc. | Cushioned bag and apparatus and method of making a cushioned bag |
| CN201296431Y (en) * | 2008-12-03 | 2009-08-26 | 苏州市合兴食品有限公司 | Self-sealing condiment packaging bag |
| CN201390005Y (en) * | 2009-04-07 | 2010-01-27 | 江阴宝柏新型包装材料有限公司 | Polypropylene-polyethylene co-extruded and blown film |
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