CN108773137B - Automatically it is packed for polyethylene film and preparation method thereof - Google Patents
Automatically it is packed for polyethylene film and preparation method thereof Download PDFInfo
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- CN108773137B CN108773137B CN201810666352.9A CN201810666352A CN108773137B CN 108773137 B CN108773137 B CN 108773137B CN 201810666352 A CN201810666352 A CN 201810666352A CN 108773137 B CN108773137 B CN 108773137B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
Abstract
The invention discloses one kind to be packed for polyethylene film automatically, including outer layer, middle layer and the internal layer successively overlapped；Outer layer by following parts by weight material composition: 20-40 parts LDPE, 30-50 parts LLDPE, 20-40 parts of melting means are 1.1g/10min, density 0.920g/cm3LLDPE；Middle layer by following parts by weight material composition: 10-30 parts of LDPE, 30-50 parts of melting means are 1.1g/10min, density 0.920g/cm3LLDPE, 30-50 part melting means be 2.4g/10min, density 0.921g/cm3LLDPE；Internal layer by following parts by weight material composition: 10-30 parts LDPE, 30-50 parts LLDPE, 10-30 parts of m-LLDPE.The present invention solves the problems, such as that polyethylene film thermal viscosity is lower and broken bag rate is higher.
Description
Technical field
The present invention relates to a kind of polyethylene films, more specifically, it be related to it is a kind of be packed for automatically polyethylene film and
Preparation method.
Background technique
Polyethylene is one of most important resin in polyolefin resin, is with fastest developing speed and in great demand in the world today
A kind of material.Polyethylene mainly includes low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene, high-density polyethylene
Alkene etc. has very extensive application in fields such as packaging, medical treatment, tubing.
In the prior art, it can refer to the Chinese invention patent application file that application publication number is CN105968489A, it is public
The preparation method for having opened a kind of polyethylene antibiotic packing film, is indicated with parts by weight, by 0.3-1.0 parts of Ag-carried nanometer titanium dioxides
Antibacterial agent is added in 100 parts of polyvinyl resins, adds 0.06-0.24 parts of antioxidant 1076s and 0.04-0.16 parts of auxiliary are anti-
Oxygen agent 168 is granulated, dry, blown film after being sufficiently mixed in a high speed mixer, polyethylene antibiotic packing film is prepared.
Though this polyethylene antibiotic packing film can reach 90% to the bacteriostasis rate of Escherichia coli and staphylococcus aureus
More than, have the advantages that nontoxic, safety and sanitation, but Hot Tack strength is poor and fall strength of briquette is poor, and intensity is lower.
In the prior art, it can refer to the Chinese invention patent application file that application publication number is CN106432888A, it is public
A kind of high-intensitive anti-static polythene film and its preparation method and application is opened, the polyethylene film is by weight percentage
Contain following component: low density polyethylene (LDPE): 15%-35%, linear low density polyethylene: 50%-70%, metallocene PE:
5%-15%, opening agent: 1%-4%；Antistatic agent: 1%-3%, in addition, by with low density polyethylene (LDPE) (LDPE) be base-material,
By the way that linear low density polyethylene (LLDPE) is added, metallocene PE (MLLPE) blending extrusion, granulation, is blow molded, make
Obtaining the polyethylene film has preferable drawing force and antistatic property.
This high intensity anti-static polythene film is but because hot sticky strong with preferable drawing force and antistatic property
Degree and impact resistant strength are poor, and in packaging, broken bag rate is higher.
Therefore how to prepare a kind of Hot Tack strength and fall strength of briquette is higher, and the lower polyethylene film of broken bag rate is to need
It solves the problems, such as.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide one kind to be packed for polyethylene film automatically,
It keeps the broken bag rate of packaging bag lower with preferable Hot Tack strength and resistance to fall strength of briquette.
To achieve the above object, the present invention provides the following technical scheme that a kind of be packed for polyethylene film automatically, including
Outer layer, middle layer and the internal layer successively overlapped；The outer layer by following parts by weight material composition: 20-40 parts of melting means are 1.9g/
10min, density 0.924g/cm3LDPE, 30-50 part melting means be 1.0g/10min, density 0.92g/cm3LLDPE,
20-40 parts of melting means are 1.1g/10min, density 0.920g/cm3LLDPE and 3-5 parts of emulsifier；The middle layer by with
The material composition of lower parts by weight: 10-30 parts of melting means are 1.9g/10min, density 0.925g/cm3LDPE, 30-50 part melting means
For 1.1g/10min, density 0.920g/cm3LLDPE, 30-50 part melting means be 2.4g/10min, density 0.921g/cm3
The emulsifier of LLDPE, 7-9 part, 5-15 parts of density be 1.47g/cm3Polyether-ether-ketone, 10-14 parts of polyethylene is with white mother
Material；The internal layer by following parts by weight material composition: 10-30 parts of melting means are 1.9g/10min, density 0.925g/cm3's
LDPE, 30-50 parts of melting means are 1.0g/10min, density 0.92g/cm3M-LLDPE, 10-30 parts of LLDPE, 10-30 part it is poly-
Carbonic ester, 2-2.8 part opening agent, 1-1.4 parts of slipping agents, 2-6 parts of emulsifiers.
By using above-mentioned technical proposal, the limited strength of polyethylene film, thus also need under normal conditions by its with
The progress of other films is compound, and outer layer is that PE film and other films carry out compound one layer, and wherein LDPE has excellent processing performance
And sealing property, there is preferable impact resistance and stability, can be improved pressure resistance and the impact resistance of product, preferably benefit peace
The 2420H of company, moral Basel production, it is 1.0g/10min, density 0.92g/cm that melting means is added in the LDPE of outer layer3's
LLDPE and melting means are 1.1g/10min, density 0.920g/cm3LLDPE, respectively preferred Philippine NPCA company production
Aforementioned proportion and the melting means LLDPE, Neng Gouti different with density is added in the 2045G of LL0209AA and Tao Shi E.I.Du Pont Company production
The elongation and impact resistant strength of high PE film；Middle layer is the articulamentum of outer layer and internal layer, to guarantee what outer layer and internal layer combined
The different LLDPE of melting means is added in the LDPE of the 2426H of preferably middle Yulin company, the Shenhua production of middle layer, respectively in compactness
It is preferred that the LL0220KJ that the 2045G of Tao Shi E.I.Du Pont Company production and Iranian petro-chemical corporation generate, polyether-ether-ketone can be such that PE film has
There are good toughness and rigidity, the preferably HM-10 of La Ti company, Italy production, middle layer is not only the connection of outer layer and internal layer
Layer, is also used as coloring layer, and according to production needs, the polyethylene that the present invention is added 10-14 parts further preferably into middle layer is used
White masterbatch increases the covering power of polyethylene film, the WPE-01 of preferred Pu Li parent company production；Internal layer is straight with pack content
One layer to be in contact is connect, existing technology of the package is usually will be internal product-filled in progress heat to it after packing film paper bag
Envelope, during carrying out filling, product is easily attached to internal layer surface, and leakproofness and the heat-sealing for influencing subsequent heat-sealing process are strong
Degree, therefore is added m-LLDPE in outer layers of the present invention, with excellent antifouling property, Hot Tack strength and heat seal strength with
And solvent resistant shape and impact resistance, guarantee PE film have stronger adaptation and heat seal strength, m-LLDPE in internal layer after sealing
It is preferred that the 2018HA of Exxon Mobil Corporation's production, the present invention go back in inner layer and polycarbonate are added, for improving adding for PE film
Work performance improves the intensity and fatigue durability of internal layer, makes internal layer dimensionally stable, preferred Taiwan South Asia company production
5410G2；PE film of the invention successively includes outer layer, middle layer and internal layer, outer layer and other films have stronger multiplicity,
Excellent mechanical property, middle layer and outer layer and internal layer have stronger bond strength, and internal layer has excellent resistance tocrocking, heat-sealing
Have afterwards compared with high adhesion and heat seal strength, therefore when PE film provided by the invention packs product, there is excellent heat
Feng Xing guarantees material adaptation with higher and tensile strength after heat-sealing, so improve anti-leakage and it is resistance to fall shape, reduce broken
Bag rate.
The present invention is further arranged to: including outer layer, middle layer and the internal layer successively overlapped；The outer layer is by following weight
The material composition of part: 30 parts of melting means are 1.9g/10min, density 0.924g/cm3LDPE, 40 parts of melting means be 0.9g/
10min, density 0.92g/cm3LLDPE, 30 parts of melting means be 1.1g/10min, density 0.920g/cm3LLDPE and 4 part
Emulsifier；The middle layer by following parts by weight material composition: 20 parts of melting means are 1.9g/10min, density 0.925g/
cm3LDPE, 40 parts of melting means be 1.1g/10min, density 0.920g/cm3LLDPE, 40 parts of melting means be 2.4g/10min, it is close
Degree is 0.921g/cm3LLDPE, 8 parts of emulsifier, 10 parts of density be 1.47g/cm3Polyether-ether-ketone, 12 parts polyethylene use
White masterbatch；The internal layer by following parts by weight material composition: 20 parts of melting means are 1.9g/10min, density 0.925g/cm3's
LDPE, 40 parts of melting means are 1.0g/10min, density 0.92g/cm3LLDPE, 20 parts of m-LLDPE, 20 parts of polycarbonate, 2.6
Part opening agent, 1.2 parts of slipping agents, 4 parts of emulsifiers.
By using above-mentioned technical proposal, the proportion of each raw material is more reasonable in above-mentioned formula, can reduce each raw material
Waste.
The present invention is further arranged to: the opening agent refers to that silica, the partial size of silica are 4-5 μm.
By using above-mentioned technical proposal, silica opening agent can effectively improve the opening performance of PE film, prevent PE
Together, opening is difficult for film coalescence.
The present invention is further arranged to: the layer thickness ratio of the outer layer, middle layer and internal layer is 3:4:3.
By using above-mentioned technical proposal, the layer thickness ratio of outer layer, middle layer and internal layer is controlled in 3:4:3, this
Kind ratio can guarantee that outer layer, middle layer and internal layer have preferable barrier property, while having excellent heat sealability and stretching strong
Degree.
The present invention is further arranged to: the slipping agent refers to high-purity oleamide.
By using above-mentioned technical proposal, it can be rapidly migrated to PE film surface, improve opening performance, reduce energy consumption, and
Keep film thickness uniform, prevents that fold, high-purity oleamide have antistatic property, it is viscous that PE membrane product surface can be reduced
Attached dust.
In view of the deficiencies of the prior art, the present invention intends to provide one kind to be packed for polyethylene film automatically
Preparation method, preparation polyethylene film have preferable Hot Tack strength and resistance to fall strength of briquette, make the broken bag rate of packaging bag compared with
It is low.
To achieve the above object, the present invention provides the following technical scheme that a kind of system for being packed for polyethylene film automatically
Preparation Method, comprising the following steps: (1) heat up: being heated up by the way of subregion continuous warming to three-layer co-extruded blow moulding machine, always
Heating-up time is 180-220min, and final temperature reaches that internal layer host temperature is 170-200 DEG C, middle layer host temperature is 170-
200 DEG C, outer layer host temperature be 170-205 DEG C, die head temperature is 220-230 DEG C；
(2) ingredient: according to formula by the ingredient of internal layer, surface layer and middle layer be respectively put into three-layer co-extruded blown film unit into
Row spits material, and layer thickness ratio is set as internal layer: middle layer: surface layer=3:4:3；
(3) be switched on: power-up sequence is outer layer host, middle layer host, internal layer host, is spaced 1-2 minutes sequences and is switched on, three
It preferably must be held in 30-60 revs/min when layer host booting；
(4) melting extrusion: the mixed material that cooperation is completed is placed in host, and the temperature of melting is controlled in 140-250
DEG C, the revolution of three layers of host is at 40-150 revs/min；
(5) draw film: rotary pneumatic axis cold wind unit frequency being controlled in 10Hz-60Hz, is pulled up and mediates colloidal sol rapidly, protect
The 30-40m/min of hauling speed is demonstrate,proved, and pours compressed air to die head inflating port, controls blow-up ratio between 1.5-3.5, with
The traction rope being pre-placed is by film bubble average rate pull-up；
(6) splitting winding: entering corona machine through deflector roll for film bubble, enters wind-up roll machine by correction intermediate plate later, cuts
It is wound at two panels and with core；
(7) it shuts down: closing corona electromechanical source, close host power switch.
By using above-mentioned technical proposal, meet prescribed requirement, PE film using PE film thickness and width made from this method
Plasticizing is good, smooth surface no wrinkle, bubble and perforation rupture, also have quite excellent mechanical strength, toughness and compared with
For soft smooth feel, will heat up the time is set in 180-220min, can make substantially uniformity inside three-layer co-extruded blown film unit
Heated, the excessively high resin that will lead to of extrusion temperature easily decomposes, and PE film is more crisp, and longitudinal tensile strength is low, and extrusion temperature is too low, can lead
It causes resin plasticization bad, reduces tensile strength, lustrous surface and the transparency of PE film, therefore extrusion temperature is controlled in 140-
It is more suitable for guaranteeing that hauling speed in 30-40m/min, can prevent from drawing too fast, the longitudinal tensile strength of PE film between 250 DEG C
Increase, thickness reduces, and is also possible to prevent to draw slowly, the longitudinal tensile strength of PE film reduces, and thickness increases, and blow-up ratio, which refers to, blows
Ratio after swollen between the diameter of film bubble and the caliber of non-inflation, blow-up ratio increase can improve the transverse strength of PE film, but blow
Swollen more unstable than the excessive film bubble that will cause, film is easy to appear fold, therefore blow-up ratio control is advisable between 1.5-3.5；?
It is squeezed out under higher temperature, improves processing performance, improve the tensile strength and impact resistant strength of PE film.
The present invention is further arranged to: the three-layer co-extruded Blown-film line that heating is completed in the step (1) needs to keep the temperature 20-
It is switched on again after 30min.
20- is kept the temperature after the completion of the temperature of three-layer co-extruded blown film unit heats up by using above-mentioned technical proposal
30min can make the temperature of each layer host more uniform, keep each area completely heated, prevent in process of production since three layers total
Extrusion film unit uneven heating is even to cause product quality bad.
The present invention is further arranged to: the step (3) needs replacing each layer strainer before booting, highly necessary opening wind
Machine cleans the die lip of mouth mold.
By using above-mentioned technical proposal, used strainer is replaced, the net on the strainer after can be prevented
Hole is blocked, and influences the use of strainer, can carry out wind-force cleaning to vane air port using blower, it can be ensured that vane air port is no different
Object blocking, cleans the die lip of mouth mold, gel and impurity can be prevented to be attached on the die lip of mouth mold.
The present invention is further arranged to: main-machine screw uses two-flight screw, and the draw ratio of screw rod in the step (4)
For 30:1.
By using above-mentioned technical proposal, two-flight screw can be passed out the molten state material of extrusion is relatively stable
Come, plasticizing is good, has preferable processing effect.
The present invention is further arranged to: having additional circulating water temperature control system in the step (4) on host and metering adds
Expect device.
By using above-mentioned technical proposal, circulating water temperature control system is added on host, can achieve temperature-controllable
Effect, measurement charging device can guarantee that three layers reach adequate thickness.
The present invention is further arranged to: being adjusted the thickness uniformity of equipment in the step (4) when squeezing out, is kept the limit inclined
Difference is ± 6%.
By using above-mentioned technical proposal, controls the limit deviation of layer thickness ratio ± 6%, make layer thickness than inclined
Difference is smaller, meet outer layer, middle layer, internal layer layer thickness ratio be 3:4:3, layer thickness is preferable than rationally having, PE film
Impact resistant strength and heat seal strength.
In conclusion the present invention has the advantages that compared with the prior art
(1) PE film of the invention successively includes outer layer, middle layer and internal layer, and outer layer has stronger compound with other films
Degree, excellent mechanical property, middle layer and outer layer and internal layer have stronger bond strength, and internal layer has excellent resistance tocrocking,
Have after heat-sealing compared with high adhesion and heat seal strength, therefore when PE film provided by the invention packs product, has excellent
Heat sealability, guarantee heat-sealing after material adaptation with higher and tensile strength, and then improve anti-leakage and it is resistance to fall shape, subtract
Few broken bag rate；
(2) by the present invention in that the silica for being 4-5 μm with partial size, can effectively improve the opening performance of PE film, prevent
Only together, opening is difficult for PE film coalescence；
(3) by the present invention in that using high-purity oleamide as slipping agent, it can be rapidly migrated to PE film surface, improvement is opened
Mouth performance, reduces energy consumption, and keep film thickness uniform, prevents that fold, high-purity oleamide have antistatic property, can
Reduce PE membrane product surface adhesion dust.
Detailed description of the invention
Fig. 1 is the line chart of the Hot Tack strength of polyethylene made from embodiment 1-3 and comparative example 1-4.
Specific embodiment
Melting means is 1.9g/10min, density 0.924g/cm in following embodiment3LDPE be Li Ande eight Sai Er public
The 2420H, melting means 1.9g/10min, density 0.925g/cm provided is provided3LDPE be that Chinese Yulin company provides
2426H, melting means 1.0g/10min, density 0.92g/cm3LLDPE be that NPCA company, Philippine provides
LL0209AA, melting means 1.1g/10min, density 0.920g/cm3LLDPE be Tao Shi E.I.Du Pont Company provide 2045G,
Melting means is 2.4g/10min, density 0.921g/cm3LLDPE be LL0220KJ that Iranian petro-chemical corporation provides；m-
LLDPE is the 2018HA that Exxon Mobil Corporation provides, and polycarbonate is the 5410G2 that Taiwan South Asia company provides, density
For 1.47g/cm3Polyether-ether-ketone be HM-10 that Italian La Ti company provides, polyethylene is that general vertical mother is male with white masterbatch
The WPE-01 provided is provided.
Embodiment 1: one kind being packed for polyethylene film automatically, including outer layer, middle layer and the internal layer successively overlapped；
The outer layer by following parts by weight material composition: 20 parts of melting means are 1.9g/10min, density 0.924g/cm3
LDPE, 30 parts of melting means be 1.0g/10min, density 0.92g/cm3LLDPE, 20 parts of melting means be 1.1g/10min, density
For 0.920g/cm3LLDPE and 3 part of emulsifier；
The middle layer by following parts by weight material composition: 10 parts of melting means are 1.9g/10min, density 0.925g/
cm3LDPE, 30 parts of melting means be 1.1g/10min, density 0.920g/cm3LLDPE, 30 parts of melting means be 2.4g/10min, it is close
Degree is 0.921g/cm3LLDPE, 7 parts of emulsifier, 5 parts of density be 1.47g/cm3Polyether-ether-ketone, 10 parts polyethylene use
White masterbatch；
The internal layer by following parts by weight material composition: 10 parts of melting means are 1.9g/10min, density 0.925g/cm3
LDPE, 30 parts of melting means be 1.0g/10min, density 0.92g/cm3LLDPE, 10 parts of m-LLDPE, 10 parts of polycarbonate, 2
Silica, 1 part high-purity oleamide, 2 part emulsifiers of part partial size for 4-5 μm.
It is above-mentioned automatically be packed for polyethylene film preparation method the following steps are included:
(1) it heats up: being heated up by the way of subregion continuous warming to three-layer co-extruded blow moulding machine, total heating-up time is
180min, final temperature reach 170 DEG C of 1st area of internal layer host, 200 DEG C of 2nd area, 200 DEG C of 3rd area, 200 DEG C of 4th area, 170 DEG C of 5th area；It is intermediate
180 DEG C of 1st area of floor host, 200 DEG C of 2nd area, 190 DEG C of 3rd area, 195 DEG C of 4th area, 170 DEG C of 5th area；180 DEG C of 1st area of outer layer host, 198 DEG C of 2nd area,
3 205 DEG C of areas, 205 DEG C of 4th area, 170 DEG C of 5th area；221 DEG C of 1st area of die head, 223 DEG C of 2nd area, 220 DEG C of 3rd area, 225 DEG C of 4th area, 230 DEG C of 5th area,
It will heat up the three-layer co-extruded Blown-film line heat preservation 20min of completion；
(2) ingredient: according to formula by the ingredient of internal layer, surface layer and middle layer be respectively put into three-layer co-extruded blown film unit into
Row spits material, and layer thickness ratio is set as internal layer: middle layer: surface layer=3:4:3；
(3) it is switched on: replacing each layer strainer, open blower, clean the die lip of mouth mold, power-up sequence is outer layer host, centre
Layer host, internal layer host are spaced 1 minute sequence and are switched on, and three layers of host preferably must be held in 30 revs/min when being switched on, main-machine screw
Using two-flight screw, and the draw ratio of screw rod is 30:1, and circulating water temperature control system and metered charge are had additional on host
Device adjusts the thickness uniformity of equipment, makes limit deviation ± 6%；
(4) melting extrusion: the mixed material that cooperation is completed is placed in host, and the temperature of melting is controlled at 140 DEG C, three
The revolution of layer host is at 40 revs/min；
(5) draw film: rotary pneumatic axis cold wind unit frequency being controlled in 10Hz, is pulled up and mediates colloidal sol rapidly, guarantee to lead
Draw the 30m/min of speed, and pour compressed air to die head inflating port, controls blow-up ratio between 1.5, led with what is be pre-placed
Messenger is by film bubble average rate pull-up；
(6) splitting winding: entering corona machine through deflector roll for film bubble, enters wind-up roll machine by correction intermediate plate later, cuts
It is wound at two panels and with core；
(7) it shuts down: closing corona electromechanical source, close host power switch.
Embodiment 2: one kind being packed for polyethylene film automatically, including outer layer, middle layer and the internal layer successively overlapped；
The outer layer by following parts by weight material composition: 30 parts of melting means are 1.9g/10min, density 0.924g/cm3
LDPE, 40 parts of melting means be 1.0g/10min, density 0.92g/cm3LLDPE, 30 parts of melting means be 1.1g/10min, density
For 0.920g/cm3LLDPE and 4 part of emulsifier；
The middle layer by following parts by weight material composition: 20 parts of melting means are 1.9g/10min, density 0.925g/
cm3LDPE, 40 parts of melting means be 1.1g/10min, density 0.920g/cm3LLDPE, 40 parts of melting means be 2.4g/10min, it is close
Degree is 0.921g/cm3LLDPE, 8 parts of emulsifier, 10 parts of density be 1.47g/cm3Polyether-ether-ketone, 12 parts polyethylene use
White masterbatch；
The internal layer by following parts by weight material composition: 20 parts of melting means are 1.9g/10min, density 0.925g/cm3
LDPE, 40 parts of melting means be 1.0g/10min, density 0.92g/cm3LLDPE, 20 parts of m-LLDPE, 20 parts of polycarbonate,
Silica, 1.2 part high-purity oleamides, 4 part emulsifiers of 2.4 parts of partial sizes for 4-5 μm.
It is above-mentioned automatically be packed for polyethylene film preparation method the following steps are included:
(1) it heats up: being heated up by the way of subregion continuous warming to three-layer co-extruded blow moulding machine, total heating-up time is
180min, final temperature reach 170 DEG C of 1st area of internal layer host, 200 DEG C of 2nd area, 200 DEG C of 3rd area, 200 DEG C of 4th area, 170 DEG C of 5th area；It is intermediate
180 DEG C of 1st area of floor host, 200 DEG C of 2nd area, 190 DEG C of 3rd area, 195 DEG C of 4th area, 170 DEG C of 5th area；180 DEG C of 1st area of outer layer host, 198 DEG C of 2nd area,
3 205 DEG C of areas, 205 DEG C of 4th area, 170 DEG C of 5th area；221 DEG C of 1st area of die head, 223 DEG C of 2nd area, 220 DEG C of 3rd area, 225 DEG C of 4th area, 230 DEG C of 5th area,
It will heat up the three-layer co-extruded Blown-film line heat preservation 20min of completion；
(2) ingredient: according to formula by the ingredient of internal layer, surface layer and middle layer be respectively put into three-layer co-extruded blown film unit into
Row spits material, and layer thickness ratio is set as internal layer: middle layer: surface layer=3:4:3；
(3) it is switched on: replacing each layer strainer, open blower, clean the die lip of mouth mold, power-up sequence is outer layer host, centre
Layer host, internal layer host are spaced 1.5 minutes sequences and are switched on, and three layers of host preferably must be held in 45 revs/min when being switched on, host spiral shell
Bar uses two-flight screw, and the draw ratio of screw rod is 30:1, and circulating water temperature control system is had additional on host and metering adds
Expect device, adjusts the thickness uniformity of equipment, make limit deviation ± 6%；
(4) melting extrusion: the mixed material that cooperation is completed is placed in host, and the temperature of melting is controlled at 195 DEG C, three
The revolution of layer host is at 95 revs/min；
(5) draw film: rotary pneumatic axis cold wind unit frequency being controlled in 35Hz, is pulled up and mediates colloidal sol rapidly, guarantee to lead
Draw the 35m/min of speed, and pour compressed air to die head inflating port, controls blow-up ratio between 2.5, led with what is be pre-placed
Messenger is by film bubble average rate pull-up；
(6) splitting winding: entering corona machine through deflector roll for film bubble, enters wind-up roll machine by correction intermediate plate later, cuts
It is wound at two panels and with core；
(7) it shuts down: closing corona electromechanical source, close host power switch.
Embodiment 3: one kind being packed for polyethylene film automatically, including outer layer, middle layer and the internal layer successively overlapped；
The outer layer by following parts by weight material composition: 40 parts of melting means are 1.9g/10min, density 0.924g/cm3
LDPE, 50 parts of melting means be 1.0g/10min, density 0.92g/cm3LLDPE, 40 parts of melting means be 1.1g/10min, density
For 0.920g/cm3LLDPE and 5 part of emulsifier；
The middle layer by following parts by weight material composition: 30 parts of melting means are 1.9g/10min, density 0.925g/
cm3LDPE, 50 parts of melting means be 1.1g/10min, density 0.920g/cm3LLDPE, 50 parts of melting means be 2.4g/10min, it is close
Degree is 0.921g/cm3LLDPE, 9 parts of emulsifier, 15 parts of density be 1.47g/cm3Polyether-ether-ketone, 14 parts polyethylene use
White masterbatch；
The internal layer by following parts by weight material composition: 30 parts of melting means are 1.9g/10min, density 0.925g/cm3
LDPE, 50 parts of melting means be 1.0g/10min, density 0.92g/cm3LLDPE, 30 parts of m-LLDPE, 30 parts of polycarbonate,
Silica, 1.4 part high-purity oleamides, 6 part emulsifiers of 2.8 parts of partial sizes for 4-5 μm.
It is above-mentioned automatically be packed for polyethylene film preparation method the following steps are included:
(1) it heats up: being heated up by the way of subregion continuous warming to three-layer co-extruded blow moulding machine, total heating-up time is
180min, final temperature reach 170 DEG C of 1st area of internal layer host, 200 DEG C of 2nd area, 200 DEG C of 3rd area, 200 DEG C of 4th area, 170 DEG C of 5th area；It is intermediate
180 DEG C of 1st area of floor host, 200 DEG C of 2nd area, 190 DEG C of 3rd area, 195 DEG C of 4th area, 170 DEG C of 5th area；180 DEG C of 1st area of outer layer host, 198 DEG C of 2nd area,
3 205 DEG C of areas, 205 DEG C of 4th area, 170 DEG C of 5th area；221 DEG C of 1st area of die head, 223 DEG C of 2nd area, 220 DEG C of 3rd area, 225 DEG C of 4th area, 230 DEG C of 5th area,
It will heat up the three-layer co-extruded Blown-film line heat preservation 20min of completion；
(2) ingredient: according to formula by the ingredient of internal layer, surface layer and middle layer be respectively put into three-layer co-extruded blown film unit into
Row spits material, and layer thickness ratio is set as internal layer: middle layer: surface layer=3:4:3；
(3) it is switched on: replacing each layer strainer, open blower, clean the die lip of mouth mold, power-up sequence is outer layer host, centre
Layer host, internal layer host are spaced 2 minutes sequences and are switched on, and three layers of host preferably must be held in 60 revs/min when being switched on, main-machine screw
Using two-flight screw, and the draw ratio of screw rod is 30:1, and circulating water temperature control system and metered charge are had additional on host
Device adjusts the thickness uniformity of equipment, makes limit deviation ± 6%；
(4) melting extrusion: the mixed material that cooperation is completed is placed in host, and the temperature of melting is controlled at 250 DEG C, three
The revolution of layer host is at 150 revs/min；
(5) draw film: rotary pneumatic axis cold wind unit frequency being controlled in 60Hz, is pulled up and mediates colloidal sol rapidly, guarantee to lead
Draw the 40m/min of speed, and pour compressed air to die head inflating port, controls blow-up ratio between 3.5, led with what is be pre-placed
Messenger is by film bubble average rate pull-up；
(6) splitting winding: entering corona machine through deflector roll for film bubble, enters wind-up roll machine by correction intermediate plate later, cuts
It is wound at two panels and with core；
(7) it shuts down: closing corona electromechanical source, close host power switch.
Comparative example 1: one kind being packed for polyethylene film automatically, including outer layer, middle layer and the internal layer successively overlapped；
The outer layer by following parts by weight material composition: 10 parts of melting means are 1.9g/10min, density 0.924g/cm3
LDPE, 80 parts of melting means be 1.0g/10min, density 0.92g/cm3LLDPE, 10 parts of melting means be 1.1g/10min, density
For 0.920g/cm3LLDPE and 4 part of emulsifier；
The middle layer by following parts by weight material composition: 20 parts of melting means are 1.9g/10min, density 0.925g/
cm3LDPE, 40 parts of melting means be 1.1g/10min, density 0.920g/cm3LLDPE, 40 parts of melting means be 2.4g/10min, it is close
Degree is 0.921g/cm3LLDPE, 8 parts of emulsifier, 10 parts of density be 1.47g/cm3Polyether-ether-ketone, 12 parts polyethylene use
White masterbatch；
The internal layer by following parts by weight material composition: 20 parts of melting means are 1.9g/10min, density 0.925g/cm3
LDPE, 40 parts of melting means be 1.0g/10min, density 0.92g/cm3LLDPE, 20 parts of m-LLDPE, 20 parts of polycarbonate,
Silica, 1.2 part high-purity oleamides, 4 part emulsifiers of 2.4 parts of partial sizes for 4-5 μm.
This is packed for the preparation method such as embodiment 2 of polyethylene film, and extruder technical parameter and implementation automatically
Example 2 is identical.
Comparative example 2: one kind being packed for polyethylene film automatically, including outer layer, middle layer and the internal layer successively overlapped；
The outer layer by following parts by weight material composition: 30 parts of melting means are 1.9g/10min, density 0.924g/cm3
LDPE, 40 parts of melting means be 1.0g/10min, density 0.92g/cm3LLDPE, 30 parts of melting means be 1.1g/10min, density
For 0.920g/cm3LLDPE and 4 part of emulsifier；
The middle layer by following parts by weight material composition: 40 parts of melting means are 1.9g/10min, density 0.925g/
cm3LDPE, 60 parts of melting means be 1.1g/10min, density 0.920g/cm3LLDPE, 20 parts of melting means be 2.4g/10min, it is close
Degree is 0.921g/cm3LLDPE, 8 parts of emulsifier, 10 parts of density be 1.47g/cm3Polyether-ether-ketone, 12 parts polyethylene use
White masterbatch；
The internal layer by following parts by weight material composition: 20 parts of melting means are 1.9g/10min, density 0.925g/cm3
LDPE, 40 parts of melting means be 1.0g/10min, density 0.92g/cm3LLDPE, 20 parts of m-LLDPE, 20 parts of polycarbonate,
Silica, 1.2 part high-purity oleamides, 4 part emulsifiers of 2.4 parts of partial sizes for 4-5 μm.
This is packed for the preparation method such as embodiment 2 of polyethylene film, and extruder technical parameter and implementation automatically
Example 2 is identical.
Comparative example 3: one kind being packed for polyethylene film automatically, including outer layer, middle layer and the internal layer successively overlapped；
The outer layer by following parts by weight material composition: 30 parts of melting means are 1.9g/10min, density 0.924g/cm3
LDPE, 40 parts of melting means be 1.0g/10min, density 0.92g/cm3LLDPE, 30 parts of melting means be 1.1g/10min, density
For 0.920g/cm3LLDPE and 4 part of emulsifier；
The middle layer by following parts by weight material composition: 20 parts of melting means are 1.9g/10min, density 0.925g/
cm3LDPE, 40 parts of melting means be 1.1g/10min, density 0.920g/cm3LLDPE, 40 parts of melting means be 2.4g/10min, it is close
Degree is 0.921g/cm3LLDPE, 8 parts of emulsifier, 10 parts of density be 1.47g/cm3Polyether-ether-ketone, 12 parts polyethylene use
White masterbatch；
The internal layer by following parts by weight material composition: 40 parts of melting means are 1.9g/10min, density 0.925g/cm3
LDPE, 20 parts of melting means be 1.0g/10min, density 0.92g/cm3LLDPE, 40 parts of m-LLDPE, 20 parts of polycarbonate,
Silica, 1.2 part high-purity oleamides, 4 part emulsifiers of 2.4 parts of partial sizes for 4-5 μm.
This is packed for the preparation method such as embodiment 2 of polyethylene film, and extruder technical parameter and implementation automatically
Example 2 is identical.
Comparative example 4: using Authorization Notice No. for the Chinese invention patent file of CN102179985B, and it is poly- that it discloses one kind
Vinyl film and preparation method thereof, polyethylene film successively include: composite layer, middle layer and hot sealing layer；Composite layer includes:
The low density polyethylene (LDPE) of 25wt%-40wt%, the linear low density polyethylene of 25wt%-40wt% and 33wt%-45wt%
Modified metallocene linear low density polyethylene；The middle layer include: 25wt%-50wt% low density polyethylene (LDPE) and
50wt%-75wt% linear low density polyethylene；Hot sealing layer includes: the low density polyethylene (LDPE) and 65wt%- of 28wt%-35wt%
The linear low density polyethylene of 72wt%.The preparation method of the polyethylene film includes: by the composite layer, middle layer and heat
The resin raw material of sealing is in 120 DEG C~160 DEG C Coextrusion Blow Mouldings.
The technological parameter of extruder is as shown in table 1 in embodiment 1-3 and comparative example 1-3:
The technological parameter of extruder in table 1 embodiment 1-3 and comparative example 1-3
Melting means is 1.9g/10min, density 0.925g/cm in embodiment 1-3 and comparative example 1-33LDPE be labeled as A,
Melting means is 1.0g/10min, density 0.92g/cm3LLDPE be labeled as B, melting means 1.1g/10min, density 0.920g/
cm3LLDPE it is as shown in table 2 labeled as the dosage of each raw material in C, embodiment 1-3 and comparative example 1-3:
The materials table of each raw material in table 2 embodiment 1-3 and comparative example 1-3
Three pieces of polyethylene film obtained in Example 1-3 and comparative example 1-4, every piece of sample is the side of 20 × 20cm
Each sample is placed on temperature and is 23 DEG C, carries out performance detection in the environment of relative humidity is 50% by block, three pieces of samples detections
Results are averaged, and testing result is as shown in table 3:
The performance test results of polyethylene film made from table 3 embodiment 1-3 and comparative example 1-4
The properties of the detection of the polyethylene film made from embodiment 1-3 it can be seen from all data in table 3 are superior to
The properties of the detection of polyethylene film made from comparative example 1-4.
According to the formula and the obtained polyethylene film of preparation method in embodiment 1-3 and comparative example 1-4, by polyethylene film
Heat-sealing bag making is carried out at that same temperature, is prepared into the heat-sealing bag of 50 × 50cm, and each embodiment and each comparative example take 10
A sample, the water of filling 500g into heat-sealing bag, then heat-sealing bag is sealed under the same conditions, carry out drop test and resistance to
Compacting is tested, and test result is shown in Table 4:
Table 4 embodiment 1-3 and comparative example 1-4 heat-sealing bag obtained falls and pressure-resistant experimental results
By the data in table 4 it can be concluded that, polyethylene film made from embodiment 1-3 heat-sealing packaging bag pressure resistance performance compared with
Good, broken bag rate is lower, and the durability of the packaging bag of the heat-sealing of polyethylene film made from comparative example 1-4 is poor, and broken bag rate is higher.
Polyethylene film made from embodiment 1-3 and comparative example 1-4 is determined into wide 15cm, long 35cm immediately along the longitudinal direction
Sample, each embodiment and comparative example determines 3 samples, referring to testing standard YY/T1433-2016 " medical instrument software package
Package material Thermal Sealing intensity (Hot Tack strength) test method " carry out Hot Tack strength performance test, the test knot of three samples
Fruit is averaged, and test result is as shown in table 5:
The test result of the Hot Tack strength of polyethylene made from table 5 embodiment 1-3 and comparative example 1-4
By data conversion is at line chart in table 5, as shown in Figure 1.
As seen from Figure 1, the Hot Tack strength of polyethylene film reaches at 130 DEG C in embodiment 1-3 and comparative example 1-4
Highest, but the Hot Tack strength in embodiment 1-3 is greater than the Hot Tack strength in comparative example 1-4.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of be packed for polyethylene film automatically, it is characterised in that: including outer layer, middle layer and the internal layer successively overlapped；
The outer layer by following parts by weight material composition: 20-40 parts of melting means are 1.9g/10min, density 0.924g/cm3's
LDPE, 30-50 parts of melting means are 0.9g/10min, density 0.92g/cm3LLDPE, 20-40 part melting means be 1.1g/10min,
Density is 0.920g/cm3LLDPE and 3-5 parts of emulsifier；
The middle layer by following parts by weight material composition: 10-30 parts of melting means are 1.9g/10min, and density is 0.925 g/cm3
LDPE, 30-50 part melting means be 1.1g/10min, density 0.920g/cm3LLDPE, 30-50 part melting means be 2.4g/
10min, density 0.921g/cm3The emulsifier of LLDPE, 7-9 part, 5-15 parts of density be 1.47 g/cm3Polyether-ether-ketone,
The white masterbatch of 10-14 parts of polyethylene；
The internal layer by following parts by weight material composition: 10-30 parts of melting means are 1.9g/10min, and density is 0.925 g/cm3's
LDPE, 30-50 parts of melting means are 1.0g/10min, density 0.92g/cm3M-LLDPE, 10-30 parts of LLDPE, 10-30 part it is poly-
Carbonic ester, 2-2.8 part opening agent, 1-1.4 parts of slipping agents, 2-6 parts of emulsifiers, the slipping agent are high-purity oleamides.
2. according to claim 1 be packed for polyethylene film automatically, it is characterised in that: including successively overlap outer layer,
Middle layer and internal layer；
The outer layer by following parts by weight material composition: 30 parts of melting means are 1.9g/10min, density 0.924g/cm3's
LDPE, 40 parts of melting means are 0.9g/10min, density 0.92g/cm3LLDPE, 30 parts of melting means be 1.1g/10min, density is
0.920g/cm3LLDPE and 4 part of emulsifier；
The middle layer by following parts by weight material composition: 20 parts of melting means are 1.9g/10min, and density is 0.925 g/cm3's
LDPE, 40 parts of melting means are 1.1g/10min, density 0.920g/cm3LLDPE, 40 parts of melting means be 2.4g/10min, density is
0.921g/cm3LLDPE, 8 parts of emulsifier, 10 parts of density be 1.47 g/cm3Polyether-ether-ketone, 12 parts of polyethylene is with white
Masterbatch；
The internal layer by following parts by weight material composition: 20 parts of melting means are 1.9g/10min, and density is 0.925 g/cm3's
LDPE, 40 parts of melting means are 1.0g/10min, density 0.92g/cm3LLDPE, 20 parts of m-LLDPE, 20 parts of polycarbonate, 2.6
Part opening agent, 1.2 parts of slipping agents, 4 parts of emulsifiers.
3. -2 described in any item being packed for polyethylene film automatically according to claim 1, it is characterised in that: the opening agent is
Refer to that silica, the partial size of silica are 4-5 μm.
4. -2 described in any item being packed for polyethylene film automatically according to claim 1, it is characterised in that: the outer layer, in
The layer thickness ratio of interbed and internal layer is 3:4:3.
5. a kind of preparation method according to any one of claims 1-4 for being packed for polyethylene film automatically, it is characterised in that:
The following steps are included: (1) heats up: being heated up by the way of subregion continuous warming to three-layer co-extruded blow moulding machine, always when heating
Between be 180-220min, final temperature reach internal layer host temperature be 170-200 DEG C, middle layer host temperature is 170-200 DEG C,
Outer layer host temperature is 170-205 DEG C, die head temperature is 220-230 DEG C；
(2) ingredient: the ingredient of internal layer, surface layer and middle layer is respectively put into three-layer co-extruded blown film unit according to formula and is spat
Material, layer thickness ratio are set as internal layer: middle layer: surface layer=3:4:3；
(3) be switched on: power-up sequence is outer layer host, middle layer host, internal layer host, is spaced 1-2 minutes sequences and is switched on, three layers of master
Machine preferably must be held in 30-60 revs/min when being switched on；
(4) melting extrusion: the mixed material that cooperation is completed is placed in host, and the temperature of melting is controlled at 140-250 DEG C, three
The revolution of layer host is at 40-150 revs/min；
(5) draw film: rotary pneumatic axis cold wind unit frequency being controlled in 10Hz-60Hz, is pulled up and mediates colloidal sol rapidly, guarantee
The 30-40m/min of hauling speed, and compressed air is poured to die head inflating port, blow-up ratio is controlled between 1.5-3.5, with pre-
The traction rope first placed is by film bubble average rate pull-up；
(6) splitting winding: entering corona machine through deflector roll for film bubble, enters wind-up roll machine by correction intermediate plate later, cuts into two
Piece is simultaneously wound with core；
(7) it shuts down: closing corona electromechanical source, close host power switch.
6. the preparation method according to claim 5 for being packed for polyethylene film automatically, it is characterised in that: the step
(1) the three-layer co-extruded Blown-film line that heating is completed in is switched on again after needing to keep the temperature 20-30min.
7. the preparation method according to claim 5 for being packed for polyethylene film automatically, it is characterised in that: the step
(3) each layer strainer is needed replacing before booting, highly necessary opening blower, clean the die lip of mouth mold.
8. the preparation method according to claim 5 for being packed for polyethylene film automatically, it is characterised in that: the step
(4) main-machine screw uses two-flight screw in, and the draw ratio of screw rod is 30:1, and circulating water temperature control system is had additional on host
System and measurement charging device.
9. the preparation method according to claim 5 for being packed for polyethylene film automatically, it is characterised in that: the step
(4) the thickness uniformity for adjusting equipment in when squeezing out, makes limit deviation ± 6%.
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| CN109897275A (en) * | 2019-03-22 | 2019-06-18 | 福建凯达集团有限公司 | High-strength abrasion-proof packaging film and preparation method thereof |
| CN112238662A (en) * | 2019-07-17 | 2021-01-19 | 丹阳市春晓塑业有限公司 | Transparent composite film layer and film blowing method thereof |
| CN111057305A (en) * | 2019-12-17 | 2020-04-24 | 睿欧启富(苏州)包装科技有限公司 | High-beam heat-shrinkable film material and manufacturing process thereof |
| CN111825908B (en) * | 2020-06-04 | 2022-07-29 | 江门普立菲新材料有限公司 | Modified film for hot melt adhesive packaging and preparation method thereof |
| CN112208178B (en) * | 2020-10-27 | 2022-11-04 | 河北方大包装股份有限公司 | Polyolefin film for express bubble bag and preparation method thereof |
| CN112959776B (en) * | 2021-04-08 | 2022-10-25 | 珠海市德燊环保包装有限公司 | Packaging film, preparation method and packaging bag |
| CN113561598A (en) * | 2021-06-17 | 2021-10-29 | 浙江鼎乾薄膜股份有限公司 | High-performance composite film for packaging and preparation method thereof |
| CN114030258B (en) * | 2021-11-18 | 2024-02-06 | 青岛东海包装产业有限公司 | Ultralow-strength easy-to-tear PE film and preparation process thereof |
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| CN101475074A (en) * | 2009-01-22 | 2009-07-08 | 黄山永佳（集团）有限公司 | Self-lubricating polyethylene membrane |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101475074A (en) * | 2009-01-22 | 2009-07-08 | 黄山永佳（集团）有限公司 | Self-lubricating polyethylene membrane |
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