CN102452204A - FFS film for heavy packaging - Google Patents
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- CN102452204A CN102452204A CN2010105157769A CN201010515776A CN102452204A CN 102452204 A CN102452204 A CN 102452204A CN 2010105157769 A CN2010105157769 A CN 2010105157769A CN 201010515776 A CN201010515776 A CN 201010515776A CN 102452204 A CN102452204 A CN 102452204A
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Abstract
The invention relates to an FFS (Form, Fill, Seal) film for heavy packaging. The FFS film has a three layer structure with a thickness ratio of an external layer to a middle layer to an inner layer between 1:1:1 to 1:3:1; the external layer contains two varieties of m-LLDPEs proportioned with LDPE according to a certain proportion or is added with a certain amount of processing auxiliary agent and antistatic agent, etc.; the middle layer contains one variety of m-LLDPE proportioned with HDPE, LDPE and titanium white; and the inner layer contains two varieties of m-LLDPEs proportioned with LDPE according to a certain proportion or is added with a certain amount of processing auxiliary agent and opening agent, etc. The m-LLDPEs in the invention are all hexane copolymerizing m-LLDPEs. As application of a plurality of m-LLDPEs to the invention, a product has increased heat-seal performance; and application of m-LLDPE and HDPE enhances mechanical properties of the products. The FFS film prepared from the above raw material layers has characteristics of high strength, low unseal temperature, wide heat-seal window (a window of 120-200 DEG C) and good low temperature resistance, etc.; and the preparation technology is simple, requires no equipment addition and good economic and social benefits.
Description
Technical field
The present invention relates to a kind of packaging film, especially a kind of heavy packing is used the FFS film.FFS is bag (Form), charging (Fill) and seal (Seal) incorporate abbreviation, and it is a kind of advanced person's a automatic packaging system, and characteristics are quick packing, one-shot forming, possess good sealed damp-proof property and printing performance.The FFS technology can be used for heavily packing, packaging for foodstuff, wash aspects such as protecting the articles for use packing.The FFS multilayer packing membrane is the film that is applicable to heavy wrapping that utilizes the FFS production technology to produce.
Background technology
At present; Owing to be applied to the diversity of packaging facilities of the automatic packaging line of Chinese large-sized synthetical resin products; Cause the very different of packaging facilities performance; And there are repeatedly characteristics such as transhipment, rash-and-rough way of loading and unloading in the resin transportation; Thereby make the many film products that match with the automatic packaging line of massive synthetic resin product on the market, problems in packaging process, occurred, as seal tight, can not adapt to high-speed packaging, be stained with ash, mechanical strength is not enough, bale broken in loading and unloading and transportation, occurs, winter low temperature use problems such as bale broken occur.In addition along with the continuous appearance of new raw material,,, can guarantee that film has good comprehensive performances through the selection of raw material and the appropriate design of prescription for the production of FFS film provides more alternative raw materials.The baling line update that the successful Application of FFS film can be petro-chemical corporation's naval stores lays the foundation, and to improving packaging efficiency, promotes image and has positive role.
Because having crystallization homogeneous, low melting point peak value, little molecule, metallocene LLDPE separates out less, narrow molecular weight distribution, characteristics such as mechanical strength is high, initial heat-sealing temperature is low, good toughness; LDPE has that higher molecular weight and moderate molecular weight distribution, higher melt strength, excellent mechanical property, higher melt strength and maximum melt are broken the balance of speed, film is in length and breadth to the mechanical balance performance preferably; HDPE has higher molecular weight, wide, good deflection and the rigidity of molecular weight distribution; So from the market to the requirement of FFS film, the FFS film generally all is to adopt m-LLDPE, LLDPE, HDPE, LDPE etc. as raw material both at home and abroad.Publication number is to disclose a kind of polyethylene repackaging film material composition in the patent documentation of CN101255249A, and said composition comprises a kind of linear low density polyethylene (LLDPE), accounts for 60 ~ 80% of raw material total amount; And metallocene linear low density polyethylene; Account for 10 ~ 30% of raw material total amount, publication number is in the patent documentation of CN101255249A, and raw material uses maximum C6 comonomer linear low density polyethylene (LLDPE)s that are; The data of embodiment in comprehensive this patent; Can find out that the patented product mechanical strength has just satisfied standard-required, phenomenons such as bale broken possibly in the existing resin transportation of China, transhipment, cargo handling process, can occur.Publication number is the production method that the patent documentation of CN1978184A discloses a kind of blowing-film for bags, and the nexine of this film and skin all contain linear low density polyethylene (LLDPE), and the intermediate layer does not then comprise metallocene linear low density polyethylene.Publication number is that the patent documentation of CN1951773A discloses a kind of multilayer packing membrane and manufacturing approach thereof, and this film has used a large amount of linear low density polyethylene (LLDPE)s, but does not use metallocene linear low density polyethylene; Because it does not use metallocene linear-low density polyethylene; So the heat-sealing window of this product can be very narrow and its mechanical strength be not very high; From the embodiment of this patent documentation, can find out; Its mechanical strength just satisfies standard-required, and does not mention the problem of heat-sealing, in the existing resin transportation of China, transhipment, cargo handling process, the bale broken phenomenon can occur.
In order to overcome the problems referred to above, the invention provides a kind of heavy packing and use the FFS film, it has three-decker, its ectomesoderm: middle level: the thickness ratio of internal layer is between between the 1:1:1 to 1:3:1; Skin contains two kinds of m-LLDPE, and itself and LDPE be proportioning by a certain percentage, also can add a certain amount of processing aid, antistatic additive etc.; 1 kind of m-LLDPE is contained in the middle level, and itself and HDPE, LDPE, titanium white be proportioning by a certain percentage; Internal layer contains 2 kinds of m-LLDPE, and itself and LDPE be proportioning by a certain percentage, also can add a certain amount of processing aid, opening agent etc.; Related m-LLDPE is hervene copolymer m-LLDPE among the present invention.Because the application of multiple m-LLDPE among the present invention, the heat sealability of product is improved; And the application of m-LLDPE, HDPE makes the mechanical property of product be improved.The FFS film that adopts above-mentioned each layer raw material to make; Have the mechanical strength height, play that the envelope temperature is low, heat-sealing window wide (window is 120 ℃ ~ 200 ℃), low temperature resistant characteristics such as effective, its preparation technology is simple; Need not to increase equipment, have good economic benefit and social benefit.
Summary of the invention
The present invention relates to a kind of heavy packing and use the FFS film, it has three-decker, it is characterized in that: skin: the middle level: the thickness ratio of internal layer is between between the 1:1:1 to 1:3:1; Skin comprises two kinds of m-LLDPE and a kind of LDPE, and a kind of m-LLDPE wherein is hervene copolymer m-LLDPE, and melt mass flow rate is 0.5g/10min ~ 1.5g/10min, and density is 0.918 ± 0.002g/cm
3, mass fraction is 20 ~ 60 parts in the layer, and another kind of m-LLDPE also is hervene copolymer m-LLDPE, and melt mass flow rate is 1.5g/10min ~ 2.5g/10min, and density is 0.913 ± 0.002g/cm
3, mass fraction is 10 ~ 50 parts in the layer, and LDPE is homopolymerization LDPE, and melt mass flow rate is 0.2g/10min ~ 0.4g/10min, and density is 0.922 ± 0.003g/cm
3, mass fraction is 20 ~ 40 parts in the layer; The middle level comprises m-LLDPE, HDPE, LDPE and titanium white, and wherein m-LLDPE is hervene copolymer m-LLDPE, and melt mass flow rate is 0.5g/10min ~ 1.5g/10min, and density is 0.918 ± 0.002g/cm
3, mass fraction is 40 ~ 80 parts in the layer, and HDPE is 1-butylene copolymerization HDPE, and melt mass flow rate is 0.05g/10min ~ 0.15g/10min, and density is 0.952 ± 0.004g/cm
3, mass fraction is 10 ~ 30 parts in the layer, and the melt mass flow rate of LDPE is 0.2g/10min ~ 0.4g/10min, and density is 0.922 ± 0.003g/cm
3, mass fraction is 10 ~ 30 parts in the layer, titanium white content is 6000 ~ 18000PPM; Internal layer comprises two kinds of m-LLDPE and a kind of LDPE, and a kind of m-LLDPE wherein is hervene copolymer m-LLDPE, and melt mass flow rate is 0.5g/10min ~ 1.5g/10min, and density is 0.918 ± 0.002g/cm
3, mass fraction is 20 ~ 60 parts in the layer, and the melt mass flow rate of another kind of m-LLDPE is 1.5g/10min ~ 2.5g/10min, and density is 0.913 ± 0.002g/cm
3, mass fraction is 10 ~ 50 parts in the layer, and LDPE is homopolymerization LDPE, and melt mass flow rate is 0.2g/10min ~ 0.4g/10min, and density is 0.922 ± 0.003g/cm
3, mass fraction is 10 ~ 30 parts in the layer.The above various raw material is commercial.
With above-mentioned each layer component tabulation, set every layer of resin by each 100 parts of mass parts, technique scheme is as shown in table 1.
Table 1, each layer component of FFS film and proportioning thereof
Above-mentioned skin also can add an amount of processing aid, antistatic additive; Internal layer also can add an amount of processing aid, opening agent.
Said a kind of m-LLDPE is a kind of hexene copolymer, and melt mass flow rate (190 ℃, 2.16kg) is 0.5g/10min ~ 1.5g/10min, and density is 0.918 ± 0.002g/cm
3, have comonomer unit and on strand, evenly distribute, the crystallization homogeneous, the big molecule of no low co-monomer content, the low melting point peak value, the little molecule of no high comonomer content, molecule is separated out less, characteristics such as narrow molecular weight distribution; For film is used metallocene linear-low density polyethylene.
Said another kind of m-LLDPE is a kind of hexene copolymer, and melt mass flow rate (190 ℃, 2.16kg) is 1.5g/10min ~ 2.5g/10min, and density is 0.913 ± 0.002g/cm
3, have good, the characteristics such as heat-sealing temperature is low, good toughness, narrow molecular weight distribution of intensity, for film is used metallocene linear-low density polyethylene.
Said HDPE is a butene-1 copolymer, and melt mass flow rate (190 ℃, 2.16kg) is 0.05g/10min ~ 0.15g/10min, and density is 0.952 ± 0.004g/cm
3, having HMW, molecular weight distribution is wide, characteristics such as good toughness, rigidity, perhaps film is resin dedicated in order to extrude.
Said LDPE is a homopolymers, and (190 ℃, 2.16kg) is 0.2g/10min ~ 0.4g/10min for melt mass flow rate, and density is 0.922 ± 0.003g/cm
3Have higher molecular weight and moderate molecular weight distribution, reasonably degree of branching control and stronger characteristics such as crystallizing power, thus make it to have excellent mechanical property, balance that higher melt strength and maximum melt are broken speed; Good processing properties, for film resin dedicated.
Said antistatic additive is quaternary amine or alkylphosphonic.
Said opening agent is synthetic silica class or diatom great soil group or the agent of talcs opening.
Said processing aid is a fluoropolymer additive.
The main performance index and the testing standard of heavy duty packaging film product are as shown in table 2.
The main performance index of table 2, heavy duty packaging film product and testing standard
The specific embodiment
Embodiment 1
Heavily packing is as shown in table 3 with each layer component of FFS film and proportioning thereof.
Table 3, heavily the packing with each layer component of FFS film and proportioning thereof
Annotate: 1018CA is a U.S. EXXON Company products; SP1520 is the Mitsui Company products; LD163 is the Yanshan Petrochemical product; DFDA6098 is the Qilu Petrochemical product; Titanium white adds with the master batch form, and the titanium white master batch is the Capote Company products; Fluoropolymer additive is the 3M Company products.
FFS film properties with this prescription is produced is as shown in table 4.
Table 4, FFS film properties
Annotate: freezing fall-down test, mainly investigate this prescription operating position in winter, China's winter temperature is lower than-21 ℃ regional less, through testing-21 ℃ of freezing result of experiment of 48 hours, in China's territorial scope, the use of low temperature environment FFS, representative.
The heat-sealing temperature and the heat sealing strength of the FFS film of producing with this prescription are as shown in table 5.
Table 5, heat-sealing temperature and heat sealing strength
* annotate: heat sealed time 1 second, pressure are 0.4MPa.
Because not about playing the definition of envelope temperature and heat-sealing window, synthesis's standard, practical experience are with reference to QB/T2358-1998 heat sealing strength standard now in China; Definition heat sealed time 1 second; Pressure is 0.4Mpa, and during hot strength>=30N/15mm, heat-sealing temperature has been defined as the envelope temperature; Heat sealing strength≤30N/15mm when perhaps the film seal place occurs seriously sealing breakoff phenomenon, is defined as the highest heat-sealing temperature; Be defined as the heat-sealing window from the envelope temperature to the highest heat-sealing temperature.
Embodiment 2
Heavily packing is as shown in table 6 with each layer component of FFS film and proportioning thereof.
Table 6, heavily the packing with each layer component of FFS film and proportioning thereof
Annotate: 1018CA is a U.S. EXXON Company products; SP1520 is the Mitsui Company products; LD163 is the Yanshan Petrochemical product; DFDA6098 is the Qilu Petrochemical product; Titanium white adds with the master batch form, and the titanium white master batch is the Capote Company products; Fluoropolymer additive is the 3M Company products.
FFS film properties with this prescription is produced is as shown in table 7.
Table 7, FFS film properties
The heat-sealing temperature and the heat sealing strength of the FFS film of producing with this prescription are as shown in table 8.
Table 8 heat-sealing temperature and heat sealing strength
* annotate: heat sealed time 1 second, pressure are 0.4MPa.This embodiment, the heat-sealing window is 125 ℃ ~ 200 ℃.
Embodiment 3
Heavily packing is as shown in table 9 with each layer component of FFS film and proportioning thereof.
Table 9, heavily the packing with each layer component of FFS film and proportioning thereof
Annotate: 1018CA is a U.S. EXXON Company products; SP1520 is the Mitsui Company products; LD163 is the Yanshan Petrochemical product; DFDA6098 is the Qilu Petrochemical product; Titanium white adds with the master batch form, and the titanium white master batch is the Capote Company products; Fluoropolymer additive is the 3M Company products; Antistatic additive is to add with the master batch form; This antistatic additive master batch AS G2 AE3 be a kind of be carrier with the low density polyethylene (LDPE), contain the fast long-acting combination antistatic master granule of 2% glyceryl monostearate and 3% ethoxylated amine, be Rui Tulan (Tianjin) Science and Technology Ltd. product.
FFS film properties with this prescription is produced is as shown in table 10.
Table 10, FFS film properties
The heat-sealing temperature and the heat sealing strength of the FFS film of producing with this prescription are as shown in table 11.
Table 11 heat-sealing temperature and heat sealing strength
The product antistatic effect is good, and heat seal strength is high, and the heat-sealing window is wide, and the heat-sealing window is 120 ℃ ~ 190 ℃.
Embodiment 4
Heavily packing is as shown in table 12 with each layer component of FFS film and proportioning thereof.
Table 12, heavily the packing with each layer component of FFS film and proportioning thereof
Annotate: 1018CA is a U.S. EXXON Company products; SP1520 is the Mitsui Company products; LD163 is the Yanshan Petrochemical product; DFDA6098 is the Qilu Petrochemical product; Titanium white adds with the master batch form, and the titanium white master batch is the Capote Company products.
FFS film properties with this prescription is produced is as shown in table 13.
Table 13, FFS film properties
The heat-sealing temperature and the heat sealing strength of the FFS film of producing with this prescription are as shown in table 14.
Table 14 heat-sealing temperature and heat sealing strength
The product heat seal strength is high, and the heat-sealing window is wide, and the heat-sealing window is 130 ℃ ~ 200 ℃.
Embodiment 5
Heavily packing is as shown in Tble 15 with each layer component of FFS film and proportioning thereof.
Table 15, heavily the packing with each layer component of FFS film and proportioning thereof
Annotate: 1018CA is a U.S. EXXON Company products; SP1520 is the Mitsui Company products; LD163 is the Yanshan Petrochemical product; 7000F is the Yanshan Petrochemical product; Titanium white adds with the master batch form, and the titanium white master batch is the Capote Company products.
FFS film properties with this prescription is produced is shown in table 16.
Table 16, FFS film properties
The heat-sealing temperature and the heat sealing strength of the FFS film of producing with this prescription are shown in table 17.
Table 17 heat-sealing temperature and heat sealing strength
The product heat seal strength is high, and the heat-sealing window is wide, and the heat-sealing window is 120 ℃ ~ 200 ℃.
Embodiment 6
Heavily packing is shown in table 18 with each layer component of FFS film and proportioning thereof.
Table 18, heavily the packing with each layer component of FFS film and proportioning thereof
Annotate: 1018CA is a U.S. EXXON Company products; SP1520 is the Mitsui Company products; LD163 is the Yanshan Petrochemical product; DFDA6098 is the Qilu Petrochemical product; Titanium white adds with the master batch form, and the titanium white master batch is the Capote Company products; AB905 is an INEOS Silicas Company products.
FFS film properties with this prescription is produced is shown in table 19.
Table 19, FFS film properties
The heat-sealing temperature and the heat sealing strength of the FFS film of producing with this prescription are shown in table 20.
Table 20, heat-sealing temperature and heat sealing strength
The product heat seal strength is high, and the heat-sealing window is wide, and the heat-sealing window is 120 ℃ ~ 200 ℃.
Embodiment 7
Heavily packing is shown in table 21 with each layer component of FFS film and proportioning thereof.
Table 21, heavily the packing with each layer component of FFS film and proportioning thereof
Annotate: 1018CA is a U.S. EXXON Company products; SP1520 is the Mitsui Company products; LD163 is the Yanshan Petrochemical product; DFDA6098 is the Qilu Petrochemical product; Titanium white adds with the master batch form, and the titanium white master batch is the Capote Company products.
FFS film properties with this prescription is produced is shown in table 22.
Table 22, FFS film properties
The heat-sealing temperature and the heat sealing strength of the FFS film of producing with this prescription are shown in table 23.
Table 23 heat-sealing temperature and heat sealing strength
The product heat seal strength is high, and the heat-sealing window is wide, and the heat-sealing window is 125 ℃ ~ 195 ℃.
Comparative Examples 1:
Each layer component and proportioning thereof are shown in table 24.
Table 24, each layer component and proportioning thereof
FFS film properties with this prescription is produced is as shown in Tble 25.
Table 25, FFS film properties
The heat-sealing temperature and the heat sealing strength of the FFS film of producing with this prescription are shown in table 26.
Table 26 heat-sealing temperature and heat sealing strength
The heat-sealing window of this comparison sample is 130 ℃ ~ 160 ℃.
Can find out that from the detection data of Comparative Examples its heat-sealing window is narrower than embodiment, and the low temperature fall-down test fails to reach requirement.
Adopt three-layer co-extruded technology to produce the FFS film, three-layer co-extruded film can decompose quality index, reaches total quality and meets the requirements thereby utilize different retes to satisfy Different products quality index item.Three-layer co-extruded film comes combination raw materials prescription neatly according to the supply of material price and the user's request in market more easily, and to reach optimum economic benefit, the raw material applicability is wide, and properties of product are more excellent.
According to the character and the requirement of different retes, like design each layer raw material and proportionings such as requirement of strength, heat-sealing requirement, stiffness requirement and processing characteristics requirements.Selected prescription warp repeatedly three layers of composite testing proves that this prescription film-blowing process is stable, and the film mechanical strength of blowing is high, and especially heat sealability is with the obvious advantage.
-21 ℃ have been carried out 2 meters fall-down tests after freezing 48 hours; After 6 directions are fallen for 6 times respectively; Any breakage does not take place, and the anti-drop performance after freezing has reached the requirement of the anti-property fallen in the product standard, explains that this prescription has intensity preferably at low temperatures too.
Claims (7)
- One kind heavily packing use the FFS film, it has three-decker, it is characterized in that: skin: the middle level: the thickness of internal layer is than being between between the 1:1:1 to 1:3:1; Skin comprises two kinds of m-LLDPE and a kind of LDPE, and the melt mass flow rate of a kind of m-LLDPE wherein is 0.5g/10min ~ 1.5g/10min, and density is 0.918 ± 0.002g/cm 3, mass fraction is 20 ~ 60 parts in the layer, and the melt mass flow rate of another kind of m-LLDPE is 1.5g/10min ~ 2.5g/10min, and density is 0.913 ± 0.002g/cm 3, mass fraction is 10 ~ 50 parts in the layer, and the melt mass flow rate of LDPE is 0.2g/10min ~ 0.4g/10min, and density is 0.922 ± 0.003g/cm 3, mass fraction is 20 ~ 40 parts in the layer; The middle level comprises m-LLDPE, HDPE, LDPE and titanium white, and wherein the melt mass flow rate of m-LLDPE is 0.5g/10min ~ 1.5g/10min, and density is 0.918 ± 0.002g/cm 3, mass fraction is 40 ~ 80 parts in the layer, and the melt mass flow rate of HDPE is 0.05g/10min ~ 0.15g/10min, and density is 0.952 ± 0.004g/cm 3, mass fraction is 10 ~ 30 parts in the layer, and the melt mass flow rate of LDPE is 0.2g/10min ~ 0.4g/10min, and density is 0.922 ± 0.003g/cm 3, mass fraction is 10 ~ 30 parts in the layer, titanium white content is 6000 ~ 18000PPM; Internal layer comprises two kinds of m-LLDPE and a kind of LDPE, and the melt mass flow rate of a kind of m-LLDPE wherein is 0.5g/10min ~ 1.5g/10min, and density is 0.918 ± 0.002g/cm 3, mass fraction is 20 ~ 60 parts in the layer, and the melt mass flow rate of another kind of m-LLDPE is 1.5g/10min ~ 2.5g/10min, and density is 0.913 ± 0.002g/cm 3, mass fraction is 10 ~ 50 parts in the layer, and LDPE is a homopolymers, and melt mass flow rate is 0.2g/10min ~ 0.4g/10min, and density is 0.922 ± 0.003g/cm 3, mass fraction is 10 ~ 30 parts in the layer; The m-LLDPE of above-mentioned each layer is hervene copolymer m-LLDPE, and the HDPE in middle level is 1-butylene copolymerization HDPE.
- 2. heavy packing as claimed in claim 1 is used the FFS film, and its skin can also comprise antistatic additive.
- 3. heavy packing as claimed in claim 1 is used the FFS film, and its internal layer can also comprise the opening agent.
- 4. heavy packing as claimed in claim 1 is used the FFS film, and its skin or internal layer can also comprise this area processing aid commonly used.
- 5. heavy packing as claimed in claim 2 is used the FFS film, and described antistatic additive is quaternary amine or alkylphosphonic.
- 6. heavy packing as claimed in claim 3 is used the FFS film, and described opening agent is synthetic silica class, diatom great soil group or the agent of talcs opening.
- 7. heavy packing as claimed in claim 4 is used the FFS film, and said processing aid is a fluoropolymer additive.
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| CN103029388A (en) * | 2012-12-27 | 2013-04-10 | 广东众和化塑有限公司 | Three-layer coextrusion heavy packaging membrane and fabrication method thereof |
| CN103772797A (en) * | 2012-10-20 | 2014-05-07 | 中国石油化工股份有限公司 | Highly-transparent polyethylene composition and preparation method thereof |
| CN103935094A (en) * | 2014-03-17 | 2014-07-23 | 江苏申乾食品包装有限公司 | Antifog thinned high-toughness heat shrinkable packaging color film |
| CN104292596A (en) * | 2013-07-18 | 2015-01-21 | 中国石油化工股份有限公司 | Polyethylene composition |
| CN106079768A (en) * | 2016-07-25 | 2016-11-09 | 上海帆顺包装集团有限公司 | A kind of multilayer packing membrane |
| CN107652521A (en) * | 2016-07-26 | 2018-02-02 | 中国石化扬子石油化工有限公司 | A kind of film formula of special material and its film blowing method |
| CN109094160A (en) * | 2018-10-29 | 2018-12-28 | 昆山金盟塑料薄膜有限公司 | A kind of FFS packaging film and preparation method thereof |
| CN109229871A (en) * | 2018-08-09 | 2019-01-18 | 上海帆顺包装集团有限公司 | A kind of runner exhaust FFS film |
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| CN111267444A (en) * | 2020-01-22 | 2020-06-12 | 中天科盛（上海）企业发展股份有限公司 | FFS heavy-duty membrane and preparation process thereof |
| CN111483196A (en) * | 2020-04-09 | 2020-08-04 | 广州新文塑料有限公司 | Three-layer co-extrusion heavy packaging film and preparation method thereof |
| CN112644128A (en) * | 2019-10-11 | 2021-04-13 | 中国石油化工股份有限公司 | FFS heavy packaging film and preparation method thereof |
| CN114454579A (en) * | 2020-10-22 | 2022-05-10 | 中国石油化工股份有限公司 | Thin type FFS film for heavy packaging and preparation method thereof |
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