CN104772956B - A kind of light-weight packed film and preparation method thereof - Google Patents
A kind of light-weight packed film and preparation method thereof Download PDFInfo
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- CN104772956B CN104772956B CN201510077047.2A CN201510077047A CN104772956B CN 104772956 B CN104772956 B CN 104772956B CN 201510077047 A CN201510077047 A CN 201510077047A CN 104772956 B CN104772956 B CN 104772956B
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Abstract
The present invention discloses a kind of light-weight packed film and preparation method thereof, and the light-weight packed film is three-layer composite structure, is divided into outer membrane layer, middle level film layer and internal layer membrane layer；The constituent of outer membrane layer is polypropylene；The constituent of middle level film layer is LLDPE and low density polyethylene (LDPE)；The constituent of internal layer membrane layer is metallocene linear-low density polyethylene, low density polyethylene (LDPE) and polyolefin elastomer.The light-weight packed film properties are superior, and production process is simple, is not in the situation of viscous knife in heat seal process, are particularly suitable for high speed FFS packagings, and speed of production can be promoted to 40 bags/min, substantially increase production efficiency from original 10/min.
Description
Technical field
The present invention relates to packaging film field, more particularly to a kind of light-weight packed film and preparation method thereof.
Background technology
The three-layer co-extruded packaging film industries of FFS were flourished in recent years, and panoramic packaging film is continued to bring out.But, it is existing
There is the light-weight packed film for object below 0.8 kilogram of packaging, in heat seal process, packaging film easily glues knife, and production carries out one
It is accomplished by shutting down the cleaning edge of a knife after the section time, greatly reduces production efficiency.
Therefore, prior art has yet to be improved and developed.
The content of the invention
In view of above-mentioned the deficiencies in the prior art, provide a kind of light-weight packed film and preparation method thereof in the present invention, it is described light
Amount packaging film is a kind of three-layer co-extruded film suitable for object below 0.8 kilogram of packaging, it is intended to solve existing packaging film in heat
Easily occurs the problem of viscous knife during envelope.
Technical scheme is as follows：
A kind of light-weight packed film, wherein, the light-weight packed film is three-layer composite structure, is divided into outer membrane layer, middle level
Film layer and internal layer membrane layer；
The raw material composition of outer membrane layer is polypropylene；
The raw material composition of middle level film layer is LLDPE and low density polyethylene (LDPE)；
The raw material composition of internal layer membrane layer is metallocene linear-low density polyethylene, low density polyethylene (LDPE) and polyolefin elastic
Body.
Described light-weight packed film, wherein, the raw material of middle level film layer is constituted according to the mass fraction, linear low density polyethylene
The content of alkene is 70~80 parts, and the content of low density polyethylene (LDPE) is 20~30 parts.
Described light-weight packed film, wherein, according to the mass fraction, metallocene linear is low close for the raw material composition of internal layer membrane layer
The content that the content for spending polyethylene is 40~60 parts, the content of low density polyethylene (LDPE) is 10~30 parts and polyolefin elastomer is 20
~40 parts.
Described light-weight packed film, wherein, the polyacrylic density is 0.900~0.910g/cm3, melt index is
8g/10min。
Described light-weight packed film, wherein, the density of the LLDPE of middle level film layer is 0.918g/cm3,
Melt index is 2g/10min；The density of the low density polyethylene (LDPE) of middle level film layer is 0.92g/cm3, melt index is 4g/
10min。
Described light-weight packed film, wherein, the density of the metallocene linear-low density polyethylene of internal layer membrane layer is
0.918g/cm3, melt index is 1g/10min；The density of the low density polyethylene (LDPE) of internal layer membrane layer is 0.92g/cm3, melting refers to
Number is 4g/10min；The density of the polyolefin elastomer of internal layer membrane layer is 0.870g/cm3, melt index is 1g/10min.
Described light-weight packed film, wherein, the gross thickness of the light-weight packed film is 60 μm~80 μm；Outer membrane layer
Thickness accounts for the 28%~35% of gross thickness；The thickness of internal layer membrane layer accounts for the 40%~50% of gross thickness；Balance of middle layer film
Thickness degree.
A kind of preparation method of light-weight packed film as described above, wherein, comprise the following steps：
Polypropylene is poured into the screw extruder mixing of outer membrane layer；By LLDPE and low density polyethylene
After alkene is sufficiently mixed in proportion, the screw extruder mixing of middle level film layer is poured into；By metallocene linear-low density polyethylene, gather
After olefin elastomer and low density polyethylene (LDPE) are sufficiently mixed in proportion, the screw extruder mixing of internal layer membrane layer is poured into；
The three-layer thin-film raw material of the presentation fluidised form shape after mixing are transported into three-layer co-extruded extruder film first melt simultaneously to melt
Extrusion, mediates in bubble embryo, and by the draw of upper traction rotation tractor, film bubble is cooled in the presence of cooling vane
Type.
The preparation method of described light-weight packed film, wherein, the extruder temperature of outer membrane layer screw extruder for 180~
190 DEG C, its head temperature is 185~200 DEG C；The extruder temperature of middle level film layer screw extruder is 155~165 DEG C, its machine
Head temperature is 185~200 DEG C；The extruder temperature of internal layer membrane layer screw extruder is 155~165 DEG C, and its head temperature is 185
~200 DEG C.
The preparation method of described light-weight packed film, wherein, outer membrane layer screw extruder, middle level film layer screw rod are squeezed
The rotating speed for going out the screw rod of machine and internal layer membrane layer screw extruder is 20~40r/min, and extrusion tonnage is 25~
35MPa。
Beneficial effect：A kind of light-weight packed film provided by the present invention, is three-layer co-extruded packaging film, by every layer of different material
The collocation of material so that light-weight packed film properties of the invention are superior, production process is simple, is not in the feelings of viscous knife in heat seal process
Condition, is particularly suitable for high speed FFS packagings, and speed of production can be promoted to 40 bags/min, substantially increase life from original 10/min
Produce efficiency.The light-weight packed film is applied to less than 0.8 kilogram object of packaging, such as garment accessories, day rich pipe.And be produced into
This low, 20,000/ton of composite membrane or so, and light-weight packed film of the invention is 10,000/ton or so.
Brief description of the drawings
Fig. 1 is the structural representation of light-weight packed film of the invention.
Specific embodiment
The present invention provides a kind of light-weight packed film and preparation method thereof, to make the purpose of the present invention, technical scheme and effect
Clearer, clear and definite, the present invention is described in more detail below.It should be appreciated that specific embodiment described herein is only
It is used to explain the present invention, is not intended to limit the present invention.
A kind of light-weight packed film provided by the present invention, as shown in figure 1, being by the outer membrane layer 1, and of middle level film layer 2
Internal layer membrane layer 3, three-layer co-extruded up-draught is cold to be formed.Wherein, the constituent of outer membrane layer 1 is polypropylene (PP).Middle level
The constituent of film layer 2 be LLDPE (LLDPE) and low density polyethylene (LDPE) (LDPE), LLDPE's and LDPE
Mass parts are respectively 70~80 parts, 20~30 parts；The constituent of internal layer membrane layer 3 is metallocene linear-low density polyethylene
(m-LLDPE), low density polyethylene (LDPE) (LDPE) and polyolefin elastomer (POE), the matter between m-LLDPE, LDPE and POE three
Amount part is 40~60 parts, 10~30 parts, 20~40 parts.
The gross thickness of the light-weight packed film be 60 μm~80 μm, outer membrane layer thickness account for gross thickness 22%~
28%；Internal layer membrane layer is hot sealing layer, and its thickness accounts for the 40%~50% of gross thickness；Balance of middle level thin film layer thickness.
The polypropylene that outer membrane layer material is selected, is because polyacrylic density is that five kinds of general-purpose plastics the insides are minimum
, so selection polypropylene can reach the lightweight of film, and it also has heat-resisting, corrosion resistant advantage, improves bag
Dress film outer layer heat resisting temperature, packaging film can glue knife when solving the problems, such as heat-sealing.Middle level film layer provides intensity, material selection line
Property low density polyethylene (LDPE), with softening temperature and melt temperature higher, its tensile strength is high, tearing strength is high, resistance to environment should
Power cracking behavior, lower temperature resistance, heat resistance and paracentesis resistance are particularly superior, and can chemical-resistant reagent etc..And low density polyethylene (LDPE), into
Type processability is good, is adapted to the various moulding process of thermoplastic molding's processing, can be used to improve middle level film layer and internal layer membrane
The processing stability of layer.Internal layer membrane layer material reduction heat-sealing temperature, from metallocene linear-low density polyethylene, with brilliance
Tensile strength, impact strength and puncture resistance, these remarkable strength characters become together with good drawing-off performance
Universal packaging film resin.Because the melt index of metallocene low density polyethylene (LDPE) is all than relatively low, so in internal layer membrane layer
Need to add polyolefin elastomer and low density polyethylene (LDPE) to improve processing characteristics in film.Preferably, can select containing opening
Mouth agent and the metallocene linear-low density polyethylene of slipping agent, its performance are more excellent.The content of opening agent and slipping agent is suitable
Amount, different manufacturers or different model its content can be different, will not be described here and limit.
Preferably, in the material of outer membrane layer, the polyacrylic density is 0.900~0.910g/cm3
(ISO1183), melt index MI is 8g/10min (ISO1133,230 DEG C/2.16kg).
In the material of middle level film layer, the density of the LLDPE LLDPE is 0.918g/cm3(ASTM
D-1928), melt index MI is 2g/10min (ASTM D-1238)；The density of the low density polyethylene is 0.92g/
cm3(ISO1183), melt index MI is 4g/10min (ISO1133,230 DEG C/2.16kg).
In the material of internal layer membrane layer, the density of the metallocene linear-low density polyethylene m-LLDPE is 0.918g/
cm3, melt index MI is 1g/10min (ASTM D-1238)；The density of the low density polyethylene is 0.923g/cm3
(ISO1183), melt index MI is 4g/10min (ISO1133,230 DEG C/2.16kg).The polyolefin elastomer it is close
It is 0.870g/cm to spend3(ASTM D-1505), melt index is 1g/10min (ASTM D-1238,190 DEG C/2.16kg).
The preparation method of the light-weight packed film is also provided in the present invention, following steps are specifically included：
The preparation of S1, outer membrane layer film：Polypropylene PP is directly poured into outer membrane layer screw extruder mixing.Its
In, the extruder temperature of outer membrane layer screw extruder is 180~190 DEG C, the head temperature of its screw extruder for 185~
200℃.The rotating speed of the screw rod is 20~40r/min, and extrusion tonnage is 25~35MPa.
The preparation of S2, middle level film layer film：By LLDPE LLDPE and low density polyethylene press than
After example is sufficiently mixed, middle level film layer screw extruder mixing is poured into.Wherein, the extruder temperature of middle level film layer screw extruder
It it is 155~165 DEG C, the head temperature of its screw extruder is 185~200 DEG C.The rotating speed of the screw rod is 20~40r/min,
Extrusion tonnage is 25~35MPa.
The preparation of S3, internal layer membrane layer film：By metallocene linear-low density polyethylene m-LLDPE, polyolefin elastomer
After POE and low density polyethylene are sufficiently mixed in proportion, internal layer membrane layer screw extruder mixing is poured into.Wherein, internal layer
The extruder temperature of film layer screw extruder is 155~165 DEG C, and the head temperature of its screw extruder is 185~200 DEG C.Institute
The rotating speed of screw rod is stated for 20~40r/min, extrusion tonnage is 25~35MPa.
S4, extrusion molding co-extrusion up-draught are cold：The three-layer thin-film raw material of the presentation fluidised form shape after mixing are conveyed simultaneously
To three-layer co-extruded extruder film head, in the common melting extrusion of extruder head, it is in bubble embryo to mediate to three kinds of raw material of fluidised form shape, is passed through
The draw of upper traction rotation tractor, film bubble cooling shaping in the presence of cooling vane.Rolled up finally by wrap-up
The light-weight packed films of Qu Suoshu.
Below by way of specific embodiment, the present invention will be further described.
Embodiment 1
The light-weight packed film is prepared according to above-mentioned technique, in the present embodiment, the gross thickness of the light-weight packed film is 60 μ
M, outer membrane thickness degree is 13.2~16.8 μm, and middle level thin film layer thickness is 13.2~22.8 μm, and internal layer membrane thickness degree is
24~30 μm (due to co-extrusion film thickness cannot quasi- side measurement, so what is be given in embodiment is number range).Wherein, in
The composition of layer film layer is LLDPE and LDPE, and mass parts are respectively 75 parts, 25 parts；Internal layer membrane layer composition for m-LLDPE,
LDPE and POE, mass parts are 50 parts, 20 parts, 30 parts.The key technical indexes of the present embodiment is shown in Table 1.
Embodiment 2
The light-weight packed film is prepared according to above-mentioned technique, in the present embodiment, the gross thickness of the light-weight packed film is 80 μ
M, outer membrane thickness degree is 17.6~22.4 μm, and middle level thin film layer thickness is 17.6~30.4 μm, and internal layer membrane thickness degree is
32~40 μm.Wherein, the composition of middle level film layer is LLDPE and LDPE, and mass parts are respectively 75 parts, 25 parts；Internal layer membrane layer
Composition be m-LLDPE, LDPE and POE, mass parts be 60 parts, 20 parts, 20 parts.
The key technical indexes of the present embodiment is shown in Table 1.
Embodiment 3
The light-weight packed film is prepared according to above-mentioned technique, in the present embodiment, the gross thickness of the light-weight packed film is 70 μ
M, outer membrane thickness degree is 15.4~19.6 μm, and middle level thin film layer thickness is 15.4~26.6 μm, and internal layer membrane thickness degree is
28~35 μm.Wherein, the composition of middle level film layer is LLDPE and LDPE, and mass parts are respectively 80 parts, 20 parts；Internal layer membrane layer
Composition be m-LLDPE, LDPE and POE, mass parts are respectively 60 parts, 20 parts, 20 parts.
The key technical indexes of the present embodiment is shown in Table 1.
Embodiment 4
The light-weight packed film is prepared according to above-mentioned technique, in the present embodiment, the gross thickness of the light-weight packed film is 60 μ
M, outer membrane thickness degree is 13.2~16.8 μm, and middle level thin film layer thickness is 13.2~22.8 μm, and internal layer membrane thickness degree is
24~30 μm.Wherein, the composition of middle level film layer is LLDPE and LDPE, and mass parts are respectively 70 parts, 30 parts；Internal layer membrane layer
Composition be m-LLDPE, LDPE and POE, mass parts are respectively 50 parts, 25 parts, 25 parts.
The key technical indexes of the present embodiment is shown in Table 1.
The performance test results of the packaging film of the embodiment 1~4 of table 1
In sum, light-weight packed film provided by the present invention, is three-layer co-extruded packaging film, by every layer of different materials
Collocation so that light-weight packed film properties of the invention are superior, production process is simple, is not in the situation of viscous knife in heat seal process,
It is particularly suitable for high speed FFS packagings, speed of production can be promoted to 40 bags/min from original 10/min, substantially increases production effect
Rate.The light-weight packed film is applied to less than 0.8 kilogram object of packaging, such as garment accessories, day rich pipe.And production cost
It is low, 20,000/ton of composite membrane or so, and light-weight packed film of the invention is 10,000/ton or so.
It should be appreciated that application of the invention is not limited to above-mentioned citing, and for those of ordinary skills, can
To be improved according to the above description or converted, all these modifications and variations should all belong to the guarantor of appended claims of the present invention
Shield scope.
Claims (4)
1. a kind of light-weight packed film, it is characterised in that the light-weight packed film is three-layer composite structure, be divided into outer membrane layer,
Middle level film layer and internal layer membrane layer；
The raw material composition of outer membrane layer is polypropylene；
The raw material composition of middle level film layer is LLDPE and low density polyethylene (LDPE)；
The raw material composition of internal layer membrane layer is metallocene linear-low density polyethylene, low density polyethylene (LDPE) and polyolefin elastomer；
According to the mass fraction, the content of LLDPE is 70~80 parts, low-density to the raw material composition of middle level film layer
The content of polyethylene is 20~30 parts；
The raw material composition of internal layer membrane layer according to the mass fraction, the content of metallocene linear-low density polyethylene is 40~60 parts,
It is 20~40 parts with the content of polyolefin elastomer that the content of low density polyethylene (LDPE) is 10~30 parts；
The gross thickness of the light-weight packed film is 60 μm~80 μm；The thickness of outer membrane layer accounts for the 28%~35% of gross thickness；
The thickness of internal layer membrane layer accounts for the 40%~50% of gross thickness；Balance of middle level thin film layer thickness；
The polyacrylic density is 0.900~0.910g/cm3, melt index is 8g/10min；
The density of the LLDPE of middle level film layer is 0.918g/cm3, melt index is 2g/10min；Middle layer film
The density of the low density polyethylene (LDPE) of layer is 0.92g/cm3, melt index is 4g/10min；
The density of the metallocene linear-low density polyethylene of internal layer membrane layer is 0.918g/cm3, melt index is 1g/10min；It is interior
The density of the low density polyethylene (LDPE) of layer film layer is 0.92g/cm3, melt index is 4g/10min；The polyolefin of internal layer membrane layer
The density of elastomer is 0.870g/cm3, melt index is 1g/10min.
2. a kind of preparation method of light-weight packed film as claimed in claim 1, it is characterised in that comprise the following steps：
Polypropylene is poured into the screw extruder mixing of outer membrane layer；LLDPE and low density polyethylene (LDPE) are pressed
After ratio is sufficiently mixed, the screw extruder mixing of middle level film layer is poured into；By metallocene linear-low density polyethylene, polyolefin
After elastomer and low density polyethylene (LDPE) are sufficiently mixed in proportion, the screw extruder mixing of internal layer membrane layer is poured into；
The three-layer thin-film raw material of the presentation fluidised form shape after mixing are transported to three-layer co-extruded extruder film head melting extrusion simultaneously,
Mediate in bubble embryo, by the draw of upper traction rotation tractor, film bubble cooling shaping in the presence of cooling vane.
3. the preparation method of light-weight packed film according to claim 2, it is characterised in that outer membrane layer screw extruder
Extruder temperature be 180~190 DEG C, its head temperature be 185~200 DEG C；The extruder temperature of middle level film layer screw extruder
It it is 155~165 DEG C, its head temperature is 185~200 DEG C；The extruder temperature of internal layer membrane layer screw extruder is 155~165
DEG C, its head temperature is 185~200 DEG C.
4. the preparation method of light-weight packed film according to claim 2, it is characterised in that outer membrane layer Screw Extrusion
The rotating speed of the screw rod of machine, middle level film layer screw extruder and internal layer membrane layer screw extruder is 20~40r/min, extrudes
Tonnage is 25~35MPa.
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| CN106064511B (en) * | 2016-06-20 | 2017-05-03 | 广东宝佳利彩印实业有限公司 | Superstrong pressure-resistant eco-friendly soymilk powder package film and preparation method thereof |
| CN106883487A (en) * | 2017-03-15 | 2017-06-23 | 奥克斯空调股份有限公司 | It is a kind of to can be used for the laminated film and its manufacture method of equipment heat-sealing |
| CN110154478B (en) * | 2019-06-11 | 2022-01-18 | 福建富一锦科技有限公司 | Transparent milk packaging film and preparation method thereof |
| CN112848585B (en) * | 2019-11-26 | 2023-07-14 | 宁波市元祥新材料有限公司 | PE stretch winding film and preparation process thereof |
| CN111421934A (en) * | 2020-04-24 | 2020-07-17 | 大连巨通塑料制品有限公司 | Preparation method of puncture-resistant high-barrier co-extruded film |
| CN113895118A (en) * | 2021-08-26 | 2022-01-07 | 上海第云包装材料有限公司 | Polyolefin stretched film, preparation method and application thereof |
| CN113665202A (en) * | 2021-08-30 | 2021-11-19 | 南京沪汇包装科技有限公司 | Functional heat-sealing woven cloth |
| CN114103346B (en) * | 2021-10-28 | 2022-11-15 | 山东华致林医药科技有限公司 | Medicinal packaging material and preparation method thereof |
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| CN201909925U (en) * | 2010-12-20 | 2011-07-27 | 武汉华工正源光子技术有限公司 | Single-ended semiconductor optical amplifier |
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| US11292234B2 (en) * | 2012-09-13 | 2022-04-05 | Dow Global Technologies Llc | Polyolefin based films suitable for thermoforming |
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| CN201909925U (en) * | 2010-12-20 | 2011-07-27 | 武汉华工正源光子技术有限公司 | Single-ended semiconductor optical amplifier |
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