CN101007876B - Polyethylene film dedicated for genseng and production technology thereof - Google Patents
Polyethylene film dedicated for genseng and production technology thereof Download PDFInfo
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- CN101007876B CN101007876B CN200710055251XA CN200710055251A CN101007876B CN 101007876 B CN101007876 B CN 101007876B CN 200710055251X A CN200710055251X A CN 200710055251XA CN 200710055251 A CN200710055251 A CN 200710055251A CN 101007876 B CN101007876 B CN 101007876B
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Abstract
The invention relates to a polyethylene gen-seng specific film and the preparation process, belonging to agricultural covering film. Said film is semi-transparent, takes polyethylene as base material, and is prepared by adding functional masterbatch according to a certain proportion. The formulation comprises low- density polyethylene resin, liner low- density polyethylene resin, aging- tolerant masterbatch and ultra- fine calcium carbonate packing modifying masterbatch; said aging- tolerant masterbatch comprises liner polyethylene powder resin, light- stability agent, anti- oxidant and phthalocyanine; said ultra- fine calcium carbonate packing modifying masterbatch comprises liner polyethylene powder resin, calcium carbonate powder, aluminate ester coupling agent, mineral wax, micromolecule polyethylene wax or geoceric acid and anti- oxidant. The film is characterized in that: it effectivly avoids the high- temperature scorching from gen- seng leaves, increases broad light transmission, transmisses blue light and yellow selectively, which is good for gen- seng quality improvement; the life- length is long, covering film shaping is quite good, cost is low, and suitable for qide spread and application.
Description
Technical field
The present invention relates to a kind of agricultural canopy film, particularly a kind of semitransparent type polyethylene film dedicated for genseng and production technique thereof refer to the high genseng die for special purpose and the production technique thereof of semitransparent type, scattered light transmitance of the calcium carbonate modified processing of a kind of usefulness especially.
Background technology
As everyone knows, genseng has its distinctive effect as a kind of natural drug, and at home and abroad the amount of disappearing presents the trend of steady-state growth in recent years, and correspondingly, ginseng planting's area is also rolling up.Genseng property cools, the growth of half cloudy half light place, avoids the high light direct projection, and illumination is crossed and can be made genseng produce multiple physiological disturbance by force, and its typical case's performance is that blade is dried-up, causes the decline of ginseng quality and output.In the ginseng planting, used common canopy film, this kind canopy film does not have obvious change to the light that sees through in the past, and the directing light transmitance is high.Therefore, strong at light, especially during summer, people cover one deck sunshade net usually again or adopt other shading measures on common canopy film, strong excessively to avoid illumination, so not only can strengthen the workload of ginseng farming, also can increase the production cost of genseng.
At present, in film prodn,, normally earlier various powdery auxiliary agents and vector resin are processed masterbatch, again masterbatch and base resin are mixed through the forcing machine blow molding for guaranteeing the ideal dispersion effect of various auxiliary agents in film.But the calcium carbonate superfine powder particle has certain surface energy; The secondary granule very easily takes place in the course of processing; Even adopt above-mentioned way can not guarantee that it forms the ideal dispersion effect in film; Make film forming processing difficulties, appearance poor, and the light that the film of processing does not only reach requirement regulates effect, and also can descend with physical and mechanical properties.
Summary of the invention
The object of the present invention is to provide a kind of semitransparent type polyethylene film dedicated for genseng and production technique thereof; Existing film dedicated for genseng forming process difficulty, appearance poor have been solved; The light that does not reach requirement is regulated effect and physical and mechanical properties decline; And calcium carbonate superfine powder particle secondary granule phenomenon very easily takes place in the course of processing, can't guarantee that it forms problems such as ideal dispersion effect in film.
Technical scheme of the present invention is: the calcium carbonate superfine powder particle of in the canopy film, dosing some amount not only can reduce the cost of film; Can also reduce the directing light transmitance to a certain extent; Increase the scattered light transmitance; So regulate, guaranteeing on the basis that the genseng normal growth is grown, improve its quality, increase output through light.
Adopt coupling agent that calcium carbonate particles is carried out activation treatment, under proper temperature, through physics chemical action; Coupling agent molecule one end and calcium carbonate particles surface reaction; The other end and vector resin carry out physics and twine, and make mortise between calcium carbonate particles and the vector resin, with paraffin, low molecular weight polyethylene wax calcium carbonate particles are coated dispersion treatment simultaneously; Destroy and also to stop calcium carbonate particles to be reunited, thus reach mix and with the good compatible purpose of base resin.
The present invention is matrix with the Vilaterm, adds the functional master batch cooperation in proportion and forms, and its prescription is (by ratio of weight and the number of copies) as follows:
30～60 parts of 30～60 parts of linear low density polyethylene resins of ldpe resin
7.8～11.6 parts of the filling-modified masterbatch of 6.1～9.1 parts of calcium carbonate superfine powders of ageing-resistant masterbatch
Wherein, the prescription of ageing-resistant masterbatch (by ratio of weight and the number of copies) as follows:
9443.4～5.2 parts of 90.7～93.86 parts of photostabilizers of linear polyethylene powdered resin
2～3 parts of oxidation inhibitor B2150.74～1.1 part pthalocyanine blue
The prescription of the filling-modified masterbatch of calcium carbonate superfine powder is (by ratio of weight and the number of copies) as follows:
40～60 parts of 40～60 parts of Paris whites of linear polyethylene powdered resin
0.31～0.49 part in 0.58～0.87 part of paraffin of aluminate coupling agent
0.47～0.71 part of oxidation inhibitor B2150.47～0.71 of low-molecular polyethylene wax or Triple Pressed Stearic Acid part
Production technique of the present invention is to carry out according to the following steps:
A, make masterbatch by above-mentioned ageing-resistant masterbatch prescription:
In above-mentioned ageing-resistant masterbatch fill a prescription said ratio line taking property polyethylene powdered resin, photostabilizer, oxidation inhibitor and pthalocyanine blue, then each material is added plastics mixer high speed and stir and be uniformly dispersed in two minutes;
Scattered mixture is used the twin screw extruder extruding pelletization, and each processing parameter of twin screw extruder is following:
Technological temperature:
1 district, 2 districts, 3 districts, 4 districts, 5 district's heads
140～145℃ 150～155℃ 160～165℃ 170～175℃ 180～185℃ 185～190℃
Main frame frequency: 35～45Hz
Feeding frequency: 25～30Hz
Dicing machine rotating speed: 250～470 rev/mins
Temperature of cooling water: 30～35 ℃
B, press calcium carbonate filling modification masterbatch prescription and make masterbatch:
Get lime carbonate powder and coupling agent in the calcium carbonate filling modification masterbatch said ratio of filling a prescription, add the plastics mixer high speed then and stir and be uniformly dispersed in three minutes;
In scattered material, add in the calcium carbonate filling modification masterbatch said ratio of filling a prescription and get Vilaterm powdered resin, paraffin, low molecular weight polyethylene wax or Triple Pressed Stearic Acid, oxidation inhibitor, high-speed stirring was uniformly dispersed in two minutes;
Scattered mixture is used the twin screw extruder extruding pelletization, and each processing parameter of twin screw extruder is following:
Technological temperature:
1 district, 2 districts, 3 districts, 4 districts, 5 district's heads
130～135℃ 140～145℃ 150～155℃ 160～165℃ 170～175℃ 175～180℃
Main frame frequency: 30～35Hz
Feeding frequency: 25～30Hz
Dicing machine rotating speed: 250～400 rev/mins
Temperature of cooling water: 35～40 ℃
C, manufacturing canopy film:
Get ldpe resin, linear low density polyethylene resin, ageing-resistant masterbatch and the filling-modified masterbatch of calcium carbonate superfine powder in the present invention's said ratio of filling a prescription; Be uniformly dispersed through plastics mixer; Through extrusion and blow molding, each processing parameter of extrusion-blown modling unit is following again:
Extruder temperature:
1 district, 2 districts, 3 districts, 4 districts, 5 district's heads
150～155℃ 160～170℃ 180～185℃ 190～195℃ 180～190℃ 195～200℃
Set extruder screw rotating speed, main control system electric current according to goods specification and equipment situation.
Blow-up ratio is 2.1～2.7.
The calcium carbonate powder particle diameter that uses among the present invention can be 1200～1500 orders, and the film shading of particle diameter in this scope is good, and mechanical strength is had no adverse effects; Lime carbonate is dosed ratio and can be 4～5%, in this scope, can obtain the film of the transmittance of optimum genseng production requirement.
Beneficial effect of the present invention is: can suitably control the transit dose of directing light in the genseng growing environment, effectively avoid the high temperature of leaves of panax ginseng to burn; Increase seeing through of scattered light, be beneficial to the irradiation that blade is accepted light comprehensively; Selective blue light and the gold-tinted of seeing through is beneficial to ginseng quality's raising; Because of using polymerized hindered amine light stabilizer and adopting reasonable process technology, long product lifecycle can reach 28 months.The moulding of the special-purpose canopy film of Vilaterm genseng is good, smooth in appearance, and the calcium carbonate particles naked eyes are invisible.Employing is got ethene and is made base resin, and the film area coverage of unit weight is big, and through calcium carbonate-filled, canopy film cost is low, price suitable, helps promotion and application, and is practical.
Embodiment:
The present invention can adopt following raw material:
Ldpe resin: its melt index is the ldpe resin that domestic and international each ethene company of 0.3～0.4g/10min produces.
Linear low density polyethylene resin: its melt index is the linear low density polyethylene resin that domestic and international each ethene company of 0.7～1.0g/10min produces.
The linear low density polyethylene powdered resin: its melt index is the linear low density polyethylene powdered resin that domestic and international each ethene company of 1.5g/10min produces.
Photostabilizer 944 is by the production and supply of Switzerland vapour Bagong department.
Oxidation inhibitor B215 is by the production and supply of Beijing Big Dipper auxiliary chemicals ltd.
Paraffin is the olefines solid wax of C26-C32, both at home and abroad each big petroleum chemical enterprise production and supply.
Low molecular weight polyethylene wax: its molecular weight is 1000～10000, each ethene company production and supply both at home and abroad.
1200～1500 purpose calcium carbonate superfine powder powder are by the production and supply of the gorgeous nonmetal company in Huadian City, Jilin Province.
Coupling agent is Fujian Normal University's production and supply.
Embodiment 1:
A, make masterbatch by ageing-resistant masterbatch prescription:
Get melt index and be 92.3 parts of the linear polyethylene powdered resins of 1.5g/10min
2.44 parts of 0.92 part of pthalocyanine blue of 944 4.34 parts of oxidation inhibitor B215 of photostabilizer
Each material is added the stirring of plastics mixer high speed to be uniformly dispersed in two minutes;
Scattered mixture is used the twin screw extruder extruding pelletization, and each processing parameter of twin screw extruder is following:
Technological temperature:
1 district, 2 districts, 3 districts, 4 districts, 5 district's heads
140～145℃ 150～155℃ 160～165℃ 170～175℃ 180～185℃ 185～190℃
Main frame frequency: 35～45Hz
Feeding frequency: 25～30Hz
Dicing machine rotating speed: 250～470 rev/mins
Temperature of cooling water: 30～35 ℃
B, press calcium carbonate filling modification masterbatch prescription and make masterbatch:
Get melt index and be 48.85 parts of the linear polyethylene powdered resins of 1.5g/10min
0.73 part of 48.85 parts of aluminate coupling agent of 1200～1500 order Paris whites
0.59 part of 0.39 part of low-molecular polyethylene wax of paraffin or Triple Pressed Stearic Acid
0.59 part of oxidation inhibitor B215
With above-mentioned lime carbonate powder and coupling agent, add the stirring of plastics mixer high speed and be uniformly dispersed in three minutes; In scattered material, add in the calcium carbonate filling modification masterbatch said ratio of filling a prescription and get Vilaterm powdered resin, paraffin, low molecular weight polyethylene wax or Triple Pressed Stearic Acid, oxidation inhibitor, high-speed stirring was uniformly dispersed in two minutes; Scattered mixture is used the twin screw extruder extruding pelletization, and each processing parameter of twin screw extruder is following:
Technological temperature:
1 district, 2 districts, 3 districts, 4 districts, 5 district's heads
130～135℃ 140～145℃ 150～155℃ 160～165℃ 170～175℃ 175～180℃
Main frame frequency: 30～35Hz
Feeding frequency: 25～30Hz
Dicing machine rotating speed: 250～400 rev/mins
Temperature of cooling water: 35～40 ℃
C, manufacturing canopy film:
Get melt index and be 9.66 parts of 41.3 parts of the ldpe resins of 0.3～0.4g/10min, 7.74 parts of 41.3 parts of linear low density polyethylene resins, ageing-resistant masterbatch that melt index is 0.7～1.0g/10min and the filling-modified masterbatch of calcium carbonate superfine powder; Each material is uniformly dispersed through plastics mixer; Through extrusion and blow molding, each processing parameter of extrusion-blown modling unit is following again:
Extruder temperature:
1 district, 2 districts, 3 districts, 4 districts, 5 district's heads
150～155℃ 160～165℃ 180～185℃ 190～195℃ 180～190℃ 195～200℃
Set extruder screw rotating speed, main control system electric current according to goods specification and equipment situation.
Blow-up ratio is 2.1～2.7.
Embodiment 2:
A, make masterbatch by ageing-resistant masterbatch prescription:
Get melt index and be 91.8 parts of the linear polyethylene powdered resins of 1.5g/10min
2.3 parts of 0.9 part of pthalocyanine blue of 94 45 parts of oxidation inhibitor B215 of photostabilizer
Each material is added the stirring of plastics mixer high speed to be uniformly dispersed in two minutes;
Scattered mixture is used the twin screw extruder extruding pelletization, and each processing parameter of twin screw extruder is following:
Technological temperature:
1 district, 2 districts, 3 districts, 4 districts, 5 district's heads
140～145℃ 150～155℃ 160～165℃ 170～175℃ 180～185℃ 185～190℃
Main frame frequency: 35～45Hz
Feeding frequency: 25～30Hz
Dicing machine rotating speed: 250～470 rev/mins
Temperature of cooling water: 30～35 ℃
B, press calcium carbonate filling modification masterbatch prescription and make masterbatch:
Get melt index and be 56 parts of the linear polyethylene powdered resins of 1.5g/10min
0.6 part of 42.11 parts of aluminate coupling agent of 1200～1500 order Paris whites
0.7 part of 0.33 part of low-molecular polyethylene wax of paraffin or Triple Pressed Stearic Acid
0.7 part of oxidation inhibitor B215
With above-mentioned lime carbonate powder and coupling agent, add the stirring of plastics mixer high speed then and be uniformly dispersed in three minutes; In scattered material, add in the calcium carbonate filling modification masterbatch said ratio of filling a prescription and get Vilaterm powdered resin, paraffin, low molecular weight polyethylene wax or Triple Pressed Stearic Acid, oxidation inhibitor, high-speed stirring was uniformly dispersed in two minutes; Scattered mixture is used the twin screw extruder extruding pelletization, and each processing parameter of twin screw extruder is following:
Technological temperature:
1 district, 2 districts, 3 districts, 4 districts, 5 district's heads
130～135℃ 140～145℃ 150～155℃ 160～165℃ 170～175℃ 175～180℃
Main frame frequency: 30～35Hz
Feeding frequency: 25～30Hz
Dicing machine rotating speed: 250～400 rev/mins
Temperature of cooling water: 35～40 ℃
C, manufacturing canopy film:
Get melt index and be 8.2 parts of 35 parts of the ldpe resins of 0.3～0.4g/10min, 6.8 parts of 50 parts of linear low density polyethylene resins, ageing-resistant masterbatch that melt index is 0.7～1.0g/10min and the filling-modified masterbatch of calcium carbonate superfine powder; Each material is uniformly dispersed through plastics mixer; Through extrusion and blow molding, each processing parameter of extrusion-blown modling unit is following again:
Extruder temperature:
1 district, 2 districts, 3 districts, 4 districts, 5 district's heads
150～155℃ 160～165℃ 180～185℃ 190～195℃ 180～190℃ 195～200℃
Set extruder screw rotating speed, main control system electric current according to goods specification and equipment situation.
Blow-up ratio is 2.1～2.7.
Embodiment 3:
A, make masterbatch by ageing-resistant masterbatch prescription:
Get melt index and be 93.5 parts of the linear polyethylene powdered resins of 1.5g/10min
2.1 parts of 1 part of pthalocyanine blue of 944 3.4 parts of oxidation inhibitor B215 of photostabilizer
Each material is added the stirring of plastics mixer high speed to be uniformly dispersed in two minutes;
Scattered mixture is used the twin screw extruder extruding pelletization, and each processing parameter of twin screw extruder is following:
Technological temperature:
1 district, 2 districts, 3 districts, 4 districts, 5 district's heads
140～145℃ 150～155℃ 160～165℃ 170～175℃ 180～185℃ 185～190℃
Main frame frequency: 35～45Hz
Feeding frequency: 25～30Hz
Dicing machine rotating speed: 250～470 rev/mins
Temperature of cooling water: 30～35 ℃
B, press calcium carbonate filling modification masterbatch prescription and make masterbatch:
Get melt index and be 41 parts of the linear polyethylene powdered resins of 1.5g/10min
0.86 part of 56.26 parts of aluminate coupling agent of 1200～1500 order Paris whites
0.7 part of 0.48 part of low-molecular polyethylene wax of paraffin or Triple Pressed Stearic Acid
0.7 part of oxidation inhibitor B215
Get above-mentioned lime carbonate powder and coupling agent, add the stirring of plastics mixer high speed then and be uniformly dispersed in three minutes; In scattered material, add in the calcium carbonate filling modification masterbatch said ratio of filling a prescription and get Vilaterm powdered resin, paraffin, low molecular weight polyethylene wax or Triple Pressed Stearic Acid, oxidation inhibitor, high-speed stirring was uniformly dispersed in two minutes; Scattered mixture is used the twin screw extruder extruding pelletization, and each processing parameter of twin screw extruder is following:
Technological temperature:
1 district, 2 districts, 3 districts, 4 districts, 5 district's heads
130～135℃ 140～145℃ 150～155℃ 160～165℃ 170～175℃ 175～180℃
Main frame frequency: 30～35Hz
Feeding frequency: 25～30Hz
Dicing machine rotating speed: 250～400 rev/mins
Temperature of cooling water: 35～40 ℃
C, manufacturing canopy film:
Get melt index and be 11.6 parts of 40 parts of the ldpe resins of 0.3～0.4g/10min, 9.1 parts of 39.3 parts of linear low density polyethylene resins, ageing-resistant masterbatch that melt index is 0.7～1.0g/10min and the filling-modified masterbatch of calcium carbonate superfine powder; Each material is uniformly dispersed through plastics mixer; Through extrusion and blow molding, each processing parameter of extrusion-blown modling unit is following again:
Extruder temperature:
1 district, 2 districts, 3 districts, 4 districts, 5 district's heads
150～155℃ 160～165℃ 180～185℃ 190～195℃ 180～190℃ 195～200℃
Set extruder screw rotating speed, main control system electric current according to goods specification and equipment situation.
Blow-up ratio is 2.1～2.7.
Claims (2)
1. polyethylene film dedicated for genseng, it is characterized in that: this canopy film is matrix with the Vilaterm, adds functional master batch in proportion and cooperates and form, the canopy film formulation is made up of the component of following portions by weight ratio:
30～60 parts of 30～60 parts of linear low density polyethylene resins of ldpe resin
7.8～11.6 parts of the filling-modified masterbatch of 6.1～9.1 parts of calcium carbonate superfine powders of ageing-resistant masterbatch;
Said ageing-resistant masterbatch is made up of following components by weight portion:
9443.4～5.2 parts of 90.7～93.86 parts of photostabilizers of linear polyethylene powdered resin
2～3 parts of 0.74～1.1 part of phthalocyanine blues of oxidation inhibitor B215;
The filling-modified masterbatch of described calcium carbonate superfine powder is made up of the component of following portions by weight ratio:
40～60 parts of 40～60 part of 1200～1500 order Paris whites of linear polyethylene powdered resin
0.58～0.87 part of oxidation inhibitor B2150.47～0.71 of aluminate coupling agent part
0.31～0.49 part in 0.47～0.71 part of paraffin of low molecular weight polyethylene wax or Triple Pressed Stearic Acid.
2. the production technique of polyethylene film dedicated for genseng as claimed in claim 1, it is characterized in that: this technology is to carry out according to the following steps:
A, make masterbatch by ageing-resistant masterbatch prescription:
In ageing-resistant masterbatch fill a prescription said ratio line taking property polyethylene powdered resin, photostabilizer, oxidation inhibitor and pthalocyanine blue, then each material is added plastics mixer high speed and stir and be uniformly dispersed in two minutes; Scattered mixture is used the twin screw extruder extruding pelletization, and each processing parameter of twin screw extruder is following:
Technological temperature:
1 district, 2 districts, 3 districts, 4 districts, 5 district's heads
140～145℃ 150～155℃ 160～165℃ 170～175℃ 180～185℃ 185～190℃
Main frame frequency: 35～45Hz
Feeding frequency: 25～30Hz
Dicing machine rotating speed: 250～470 rev/mins
Temperature of cooling water: 30～35 ℃;
B, press the filling-modified masterbatch prescription of calcium carbonate superfine powder and make masterbatch:
Get lime carbonate powder and aluminate coupling agent in the filling-modified masterbatch of the calcium carbonate superfine powder said ratio of filling a prescription, add the plastics mixer high speed then and stir and be uniformly dispersed in three minutes;
In scattered material, add in the filling-modified masterbatch of the calcium carbonate superfine powder said ratio of filling a prescription and get Vilaterm powdered resin, paraffin, low molecular weight polyethylene wax or Triple Pressed Stearic Acid and oxidation inhibitor, high-speed stirring was uniformly dispersed in two minutes;
Scattered mixture is used the twin screw extruder extruding pelletization, and each processing parameter of twin screw extruder is following:
Technological temperature:
1 district, 2 districts, 3 districts, 4 districts, 5 district's heads
130～135℃ 140～145℃ 150～155℃ 160～165℃ 170～175℃ 175～180℃
Main frame frequency: 30～35Hz
Feeding frequency: 25～30Hz
Dicing machine rotating speed: 250～400 rev/mins
Temperature of cooling water: 35～40 ℃;
C, manufacturing canopy film:
Get ldpe resin, linear low density polyethylene resin, ageing-resistant masterbatch and the filling-modified masterbatch of calcium carbonate superfine powder in the said ratio of the prescription of canopy film; Be uniformly dispersed through plastics mixer; Through extrusion and blow molding, each processing parameter of extrusion-blown modling unit is following again:
Extruder temperature:
1 district, 2 districts, 3 districts, 4 districts, 5 district's heads
150-155℃ 160-165℃ 180-185℃ 190-195℃ 180-190℃ 195-200℃
Set extruder screw rotating speed, main control system electric current according to goods specification and equipment situation, blow-up ratio is 2.1～2.7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200710055251XA CN101007876B (en) | 2007-01-22 | 2007-01-22 | Polyethylene film dedicated for genseng and production technology thereof |
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|---|---|---|---|
| CN200710055251XA CN101007876B (en) | 2007-01-22 | 2007-01-22 | Polyethylene film dedicated for genseng and production technology thereof |
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| CN101007876A CN101007876A (en) | 2007-08-01 |
| CN101007876B true CN101007876B (en) | 2012-07-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102816370A (en) * | 2012-06-12 | 2012-12-12 | 杭州雄魁塑胶科技有限公司 | Ultra-large plastic manhole composite powder formula |
| CN102816362B (en) * | 2012-08-31 | 2014-08-13 | 广州合成材料研究院有限公司 | Long-acting anti-aging masterbatch used for polyethylene films and preparation method for long-acting anti-aging masterbatch |
| CN103205048A (en) * | 2013-04-27 | 2013-07-17 | 哈尔滨塑五有限公司 | Special BL-multifunctional film for strengthening seedling and increasing yield of paddy rice and preparation method of special BL-multifunctional film |
| CN104059273A (en) * | 2014-06-16 | 2014-09-24 | 蓝星（成都）新材料有限公司 | Special polyethylene coloring masterbatch for white thin film and preparation method of masterbatch |
| CN104098829B (en) * | 2014-07-17 | 2016-08-17 | 涂瑞强 | A kind of moisture vapor permeable polyethylene film and preparation method thereof |
| CN105474981B (en) * | 2015-11-17 | 2018-05-18 | 山东省潍坊市农业科学院 | A kind of method using shed plantation white asparagus |
| CN105638192A (en) * | 2015-12-31 | 2016-06-08 | 平南县莹冠仙生物农业科技有限公司 | Planting method for edible orchidaceae plants |
| CN106188821A (en) * | 2016-08-31 | 2016-12-07 | 程志刚 | A kind of plastic film for agricultural use |
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