CN109228592B - Common composite-grade PP cast film and production process thereof - Google Patents
Common composite-grade PP cast film and production process thereof Download PDFInfo
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- CN109228592B CN109228592B CN201810999650.XA CN201810999650A CN109228592B CN 109228592 B CN109228592 B CN 109228592B CN 201810999650 A CN201810999650 A CN 201810999650A CN 109228592 B CN109228592 B CN 109228592B
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
-
- 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
-
- 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
-
- 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
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/406—Bright, glossy, shiny surface
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/746—Slipping, anti-blocking, low friction
Abstract
The invention discloses a common composite PP casting film and a production process thereof, wherein the PP casting film comprises the following raw materials in parts by weight: RF401+ FC801 MX: FH 08: c5608+ FL7632L =1: 2.5-3.5: 0.5-1.5, SPER6 is further added into the heat-sealing layer raw material, and the weight of the added SPER6 is 2.5% -5.5% of the total weight of the heat-sealing layer raw material. Wherein when the film with the thickness not less than 50 μm is produced, the weight of the added SPER6 is 2.5-3.5% of the total weight of the heat sealing layer raw material; when a film with the thickness of 30-40 mu m is produced, the weight of the added SPER6 is 3.5-4.5% of the total weight of the heat sealing layer raw material; when a film of not more than 30 μm is produced, the weight of SPER6 added is 4.5 to 5.5% of the total weight of the heat seal layer raw material. The invention aims to provide a common composite PP casting film which has good high-glossiness and low-haze performance and has a better opening effect by uniformly distributing a slipping agent on the surface of the film and a production process thereof.
Description
Technical Field
The invention relates to the technical field of packaging materials, in particular to a common composite PP casting film and a production process thereof.
Background
The common composite PP cast film is mainly applied to the industries of food packaging, underwear packaging and the like, plays a role in preventing water vapor and oxygen from entering the inner layer of the package, and can greatly prolong the shelf life of food. The cast film is widely applied, and the common composite grade PP cast film is used for the inner layer of most food packages seen in life. Also, because of the high gloss and low haze characteristics of such films, they have found wide use in underwear packaging. With the development of socioeconomic, the demand of packaging food brought by fast-paced life is greater and greater, and the demand of the inner layer of the common composite PP casting film packaging is increased.
The conventional common compound-grade PP casting film contains FC801MX and C5608 in a production formula, FC801MX is a PP raw material of a corona layer and generally accounts for 20% of the total content, but the raw material has insufficient expressive force on high gloss and low haze, the general haze index is not less than 8, the appearance of the produced film is poor, and the prepared packaging bag influences the effect of the packaging bag and the color of food. C5608 is a PP raw material of the heat seal layer, account for 20% of the total content in the existing production too, although already contain slipping agent 1500ppm, but the coefficient of friction is still not less than 0.4, but still will appear the bad phenomenon of opening in the practical application, because the bad opening makes the finished wrapping bag unable to use normally.
Disclosure of Invention
The invention aims to overcome the defects of the cast film obtained by the conventional production formula of the common composite PP cast film in the expression capacities of high gloss and low haze and the phenomenon of poor opening after a bag is made, and provides the common composite PP cast film which has good performance of high gloss and low haze and has a better opening effect because a slipping agent is more uniformly distributed on the surface of the film and a production process thereof.
In order to achieve the purpose, the invention adopts the following technical scheme: a common composite PP casting film comprises the following raw materials in parts by weight: RF401+ FC801 MX: FH 08: and C5608+ FL7632L is 1: 2.5-3.5: 0.5-1.5, SPER6 is further added into the heat-sealing layer raw material, and the weight of the added SPER6 is 2.5-5.5% of the total weight of the heat-sealing layer raw material.
The addition amount of FC801MX accounts for the total addition amount of RF401+ FC801MX and is 0-0.5;
the ratio of the addition amount of C5608 to the total addition amount of C5608+ FL7632L is 0-0.5;
when a film with the thickness not less than 50 mu m is produced, the weight of the added SPER6 is 2.5 to 3.5 percent of the total weight of the raw material of the heat sealing layer;
when producing a film with the thickness of 30-40 mu m, the weight of the added SPER6 is 3.5-4.5 percent of the total weight of the heat sealing layer raw material;
when a film of not more than 30 μm is produced, the weight of SPER6 added is 4.5 to 5.5% of the total weight of the heat seal layer raw material.
A production process of a common composite PP cast film comprises the following steps of feeding, screw extrusion, die lip extrusion, cast molding, corona treatment, rolling and curing:
step 01) feeding: according to RF401+ FC801 MX: FH 08: adding the three layers of raw materials into three corresponding mixer charging barrels according to the weight ratio of C5608+ FL 7632L-1: 2.5-3.5: 0.5-1.5; adding RF401 and FC801MX into a mixer corresponding to the corona layer according to the ratio of 1: 0-0.5, fully stirring, placing into a material cylinder of the corona layer, and providing for a corona layer extruder for use by a material suction machine; feeding FH08 into a material cylinder of the middle layer, and providing the material cylinder for a middle layer extruder to use by a suction machine; FL7632L and C5608 are added into a mixer corresponding to the heat-seal layer according to the weight ratio of 1: 0-0.5, SPER6 is added into a cylinder of the mixer corresponding to the heat-seal layer, and the weight of the added SPER6 is 2.5-5.5% of the total weight of the raw materials of the heat-seal layer.
Step 2) screw extrusion: adjusting the processing temperature of the extruder to 230-270 ℃ to enable the raw materials to reach a molten state, then pushing the raw materials to move forward by a screw rod, and enabling the raw materials to enter a die head after passing through a filter screen;
step 3) die lip extrusion: controlling the temperature of the die head to be 210-240 ℃, controlling the temperature of the molten mass to be 250-280 ℃, and extruding the three layers of molten raw materials in a horizontal flow mode through a die lip after the three layers of molten raw materials are converged in the die head;
step 4) tape casting: controlling the temperature of the casting roller to be 25-40 ℃, and carrying out quenching forming on the raw material in a molten state on the casting roller under the action of negative pressure of a vacuum chamber;
step 05) corona treatment: carrying out corona treatment on the surface of the casting film, wherein the dyne on the surface of the casting film after the treatment is more than 40, and the corona value of the casting film can be kept more than 38 dynes after 30 days of treatment;
step 06), rolling and curing: and (4) placing the rolled film roll on a curing frame, and curing for 48-72 hours to be stable.
The technical scheme of the invention has the following positive effects: in the production formula of the improved casting film, RF401 is a PP raw material special for a common compound-grade corona layer, is a binary copolymerization PP raw material containing polypropylene and polyethylene, has good performances of high glossiness and low haze, has a haze index below 5, even below 3, and can greatly improve the expressive force of the appearance of the film after the corona layer is mixed. FL7632L is a PP raw material special for common composite heat-seal layer, wherein it also contains 1500ppm of slipping agent, playing the role of opening slipping, but the formulation of the invention also adds slipping agent SPER6, which makes the slipping agent more evenly distributed on the surface of the film, the friction coefficient is below 0.15, playing the role of better opening, making the produced casting film easy to process and use. The addition of FH08 served to support the corona layer and the heat seal layer. The cast film product prepared by the formula and the process has good physical properties.
Detailed Description
The present invention is further illustrated and described with reference to the following examples, which are not intended to limit the scope of the present invention, and all embodiments modified based on the technical solutions of the present invention are within the scope of the present invention.
Example 1
A common composite-grade PP casting film is used for producing a casting film with the thickness not less than 50 microns, and the weight ratio of raw materials of the casting film is RF 401: FH 08: FL7632L is 1:3:1, SPER6 is added into the heat-sealing layer raw material, the adding amount is 2.5-3.5% of the total weight of the heat-sealing layer raw material, the total weight of the heat-sealing layer raw material is 100kg, and the adding amount of SPER6 is 2.5-3.5 kg.
The process flow of the common composite PP cast film comprises the following steps of feeding, screw extrusion, die lip extrusion, cast molding, corona treatment, rolling and curing:
step 01) feeding: according to RF 401: FH 08: adding the three layers of raw materials into three corresponding mixer barrels according to the weight ratio of FL7632L to 1:3: 1; adding RF401 into a material cylinder of a corresponding corona layer, and providing the material cylinder for a corona layer extruder by a suction machine; feeding FH08 into a material cylinder of the middle layer, and providing the material cylinder for a middle layer extruder to use by a suction machine; FL7632L is added into a mixer corresponding to the heat-seal layer, SPER6 is added into a barrel of the mixer corresponding to the heat-seal layer, and the weight of the added SPER6 is 2.5-3.5% of the total weight of the raw materials of the heat-seal layer.
Step 2) screw extrusion: adjusting the processing temperature of the extruder to 230-270 ℃ to enable the raw materials to reach a molten state, then pushing the raw materials to move forward by a screw rod, and enabling the raw materials to enter a die head after passing through a filter screen;
step 3) die lip extrusion: controlling the temperature of the die head to be 210-240 ℃, controlling the temperature of the molten mass to be 250-280 ℃, and extruding the three layers of molten raw materials in a horizontal flow mode through a die lip after the three layers of molten raw materials are converged in the die head;
step 4) tape casting: controlling the temperature of the casting roller to be 25-40 ℃, and carrying out quenching forming on the raw material in a molten state on the casting roller under the action of negative pressure of a vacuum chamber;
step 05) corona treatment: carrying out corona treatment on the surface of the casting film, wherein the dyne on the surface of the casting film after the treatment is more than 40, and the corona value of the casting film can be kept more than 38 dynes after 30 days of treatment;
step 06), rolling and curing: and (4) placing the rolled film roll on a curing frame, and curing for 48-72 hours to be stable.
The cast film obtained using the formulation and method of this example had a haze index of no greater than 5 and a coefficient of friction of no greater than 0.15.
Example 2
A common composite grade PP casting film is used for producing a casting film with the thickness of 30-40 mu m, and the weight ratio of raw materials of the casting film is RF401+ FC801 MX: FH 08: c5608+ FL7632L is 1:2.5:0.5, SPER6 is added into the raw materials, the adding amount is 3.5-4.5% of the total weight of the raw materials of the heat sealing layer, the total weight of the raw materials of the heat sealing layer is 100kg, and the adding amount of the SPER6 is 3.5-4.5 kg.
The process flow of the common composite PP cast film comprises the following steps of feeding, screw extrusion, die lip extrusion, cast molding, corona treatment, rolling and curing:
step 01) feeding: according to RF401+ FC801 MX: FH 08: adding the three layers of raw materials into three corresponding mixer barrels according to the weight ratio of C5608+ FL 7632L-1: 2.5: 0.5; adding RF401 and FC801MX into a mixer corresponding to the corona layer according to the ratio of 1:0.3, fully stirring, placing into a material cylinder of the corona layer, and providing the mixture for a corona layer extruder by a suction machine for use; feeding FH08 into a material cylinder of the middle layer, and providing the material cylinder for a middle layer extruder to use by a suction machine; FL7632L and C5608 are added into a mixer corresponding to the heat-seal layer according to the weight ratio of 1:0.3, SPER6 is added into a cylinder of the mixer corresponding to the heat-seal layer, and the weight of the added SPER6 is 3.5-4.5% of the total weight of the raw materials of the heat-seal layer.
Step 2) screw extrusion: adjusting the processing temperature of the extruder to 230-270 ℃ to enable the raw materials to reach a molten state, then pushing the raw materials to move forward by a screw rod, and enabling the raw materials to enter a die head after passing through a filter screen;
step 3) die lip extrusion: controlling the temperature of the die head to be 210-240 ℃, controlling the temperature of the molten mass to be 250-280 ℃, and extruding the three layers of molten raw materials in a horizontal flow mode through a die lip after the three layers of molten raw materials are converged in the die head;
step 4) tape casting: controlling the temperature of the casting roller to be 25-40 ℃, and carrying out quenching forming on the raw material in a molten state on the casting roller under the action of negative pressure of a vacuum chamber;
step 05) corona treatment: carrying out corona treatment on the surface of the casting film, wherein the dyne on the surface of the casting film after the treatment is more than 40, and the corona value of the casting film can be kept more than 38 dynes after 30 days of treatment;
step 06), rolling and curing: and (4) placing the rolled film roll on a curing frame, and curing for 48-72 hours to be stable.
The cast film obtained using the formulation and method of this example had a haze index of no greater than 4 and a coefficient of friction of no greater than 0.15.
Example 3
A common composite grade PP casting film is used for producing a casting film with the thickness of less than 30 μm, and the weight ratio of raw materials of the casting film is RF401+ FC801 MX: FH 08: c5608+ FL7632L is 1:3:1, SPER6 is added into the raw materials, the addition amount of the SPER6 is 4.5% -5.5% of the total weight of other raw materials, the total weight of the raw materials of the heat sealing layer is 100kg, and the addition amount of the SPER6 is 4.5-5.5 kg.
The process flow of the common composite PP cast film comprises the following steps of feeding, screw extrusion, die lip extrusion, cast molding, corona treatment, rolling and curing:
step 01) feeding: according to RF401+ FC801 MX: FH 08: adding the three layers of raw materials into three corresponding mixer barrels according to the weight ratio of C5608+ FL7632L to 1:3.5: 1.5; adding RF401 and FC801MX into a mixer corresponding to the corona layer according to the ratio of 1:0.5, fully stirring, placing into a material cylinder of the corona layer, and providing the mixture for a corona layer extruder by a suction machine for use; feeding FH08 into a material cylinder of the middle layer, and providing the material cylinder for a middle layer extruder to use by a suction machine; FL7632L and C5608 are added into a mixer corresponding to the heat-seal layer according to the weight ratio of 1:0.5, SPER6 is added into a cylinder of the mixer corresponding to the heat-seal layer, and the weight of the added SPER6 is 4.5-5.5% of the total weight of the raw materials of the heat-seal layer.
Step 2) screw extrusion: adjusting the processing temperature of the extruder to 230-270 ℃ to enable the raw materials to reach a molten state, then pushing the raw materials to move forward by a screw rod, and enabling the raw materials to enter a die head after passing through a filter screen;
step 3) die lip extrusion: controlling the temperature of the die head to be 210-240 ℃, controlling the temperature of the molten mass to be 250-280 ℃, and extruding the three layers of molten raw materials in a horizontal flow mode through a die lip after the three layers of molten raw materials are converged in the die head;
step 4) tape casting: controlling the temperature of the casting roller to be 25-40 ℃, and carrying out quenching forming on the raw material in a molten state on the casting roller under the action of negative pressure of a vacuum chamber;
step 05) corona treatment: carrying out corona treatment on the surface of the casting film, wherein the dyne on the surface of the casting film after the treatment is more than 40, and the corona value of the casting film can be kept more than 38 dynes after 30 days of treatment;
step 06), rolling and curing: and (4) placing the rolled film roll on a curing frame, and curing for 48-72 hours to be stable.
The cast film obtained using the formulation and method of this example had a haze index of no greater than 3 and a coefficient of friction of no greater than 0.15.
Claims (3)
1. A common composite-grade PP casting film is characterized in that the casting film with the thickness not less than 50 μm is produced, and the weight ratio of raw materials of the casting film is RF 401: FH 08: FL7632L =1:3:1, and SPER6 is added into the heat-sealing layer raw material at the same time, wherein the addition amount is 2.5% -3.5% of the total weight of the heat-sealing layer raw material;
the method comprises the following specific steps:
step 01) feeding: according to RF 401: FH 08: FL7632L =1:3:1 weight ratio three layers of raw materials were added to three corresponding mixer barrels; adding RF401 into a material cylinder of a corresponding corona layer, and providing the material cylinder for a corona layer extruder by a suction machine; feeding FH08 into a material cylinder of the middle layer, and providing the material cylinder for a middle layer extruder to use by a suction machine; adding FL7632L into a mixer corresponding to the heat-seal layer, and adding SPER6 into a charging barrel of the mixer corresponding to the heat-seal layer, wherein the weight of the added SPER6 is 2.5-3.5% of the total weight of the raw materials of the heat-seal layer;
step 2) screw extrusion: adjusting the processing temperature of the extruder to 230-270 ℃ to enable the raw materials to reach a molten state, then pushing the raw materials to move forward by a screw rod, and enabling the raw materials to enter a die head after passing through a filter screen;
step 3) die lip extrusion: controlling the temperature of the die head to be 210-240 ℃, controlling the temperature of the molten mass to be 250-280 ℃, and extruding the three layers of molten raw materials in a horizontal flow mode through a die lip after the three layers of molten raw materials are converged in the die head;
step 4) tape casting: controlling the temperature of the casting roller to be 25-40 ℃, and carrying out quenching forming on the raw material in a molten state on the casting roller under the action of negative pressure of a vacuum chamber;
step 05) corona treatment: carrying out corona treatment on the surface of the casting film, wherein the dyne on the surface of the casting film after the treatment is more than 40, and the corona value of the casting film can be kept more than 38 dynes after 30 days of treatment;
step 06), rolling and curing: placing the wound film roll on a curing frame, and curing for 48-72 hours to be stable;
the cast film has a haze index of not more than 5 and a coefficient of friction of not more than 0.15.
2. A common composite grade PP casting film is characterized in that a casting film with the thickness of 30-40 mu m is produced, and the weight ratio of raw materials of the casting film is RF401+ FC801 MX: FH 08: c5608+ FL7632L =1:2.5:0.5, and SPER6 is added into the raw material, wherein the addition amount is 3.5% -4.5% of the total weight of the raw material of the heat sealing layer;
the method comprises the following specific steps:
step 01) feeding: according to RF401+ FC801 MX: FH 08: c5608+ FL7632L =1:2.5:0.5 weight ratio three layers of raw materials were added to three corresponding mixer barrels; adding RF401 and FC801MX into a mixer corresponding to the corona layer according to the ratio of 1:0.3, fully stirring, placing into a material cylinder of the corona layer, and providing the mixture for a corona layer extruder by a suction machine for use; feeding FH08 into a material cylinder of the middle layer, and providing the material cylinder for a middle layer extruder to use by a suction machine; adding FL7632L and C5608 into a mixer corresponding to the heat-seal layer according to the weight ratio of 1:0.3, adding SPER6 into a cylinder of the mixer corresponding to the heat-seal layer, wherein the weight of the added SPER6 is 3.5-4.5% of the total weight of the raw materials of the heat-seal layer;
step 2) screw extrusion: adjusting the processing temperature of the extruder to 230-270 ℃ to enable the raw materials to reach a molten state, then pushing the raw materials to move forward by a screw rod, and enabling the raw materials to enter a die head after passing through a filter screen;
step 3) die lip extrusion: controlling the temperature of the die head to be 210-240 ℃, controlling the temperature of the molten mass to be 250-280 ℃, and extruding the three layers of molten raw materials in a horizontal flow mode through a die lip after the three layers of molten raw materials are converged in the die head;
step 4) tape casting: controlling the temperature of the casting roller to be 25-40 ℃, and carrying out quenching forming on the raw material in a molten state on the casting roller under the action of negative pressure of a vacuum chamber;
step 05) corona treatment: carrying out corona treatment on the surface of the casting film, wherein the dyne on the surface of the casting film after the treatment is more than 40, and the corona value of the casting film can be kept more than 38 dynes after 30 days of treatment;
step 06), rolling and curing: placing the wound film roll on a curing frame, and curing for 48-72 hours to be stable;
the cast film has a haze index of not greater than 4 and a coefficient of friction of not greater than 0.15.
3. A common composite grade PP casting film is characterized in that the casting film with the thickness less than 30 μm is produced, and the weight ratio of raw materials of the casting film is RF401+ FC801 MX: FH 08: c5608+ FL7632L =1:3:1, and SPER6 is added into the raw materials, wherein the addition amount of the SPER6 is 4.5% -5.5% of the total weight of other raw materials;
the method comprises the following specific steps:
step 01) feeding: according to RF401+ FC801 MX: FH 08: c5608+ FL7632L =1:3.5:1.5 weight ratio three layers of raw materials were added to three corresponding mixer barrels; adding RF401 and FC801MX into a mixer corresponding to the corona layer according to the ratio of 1:0.5, fully stirring, placing into a material cylinder of the corona layer, and providing the mixture for a corona layer extruder by a suction machine for use; feeding FH08 into a material cylinder of the middle layer, and providing the material cylinder for a middle layer extruder to use by a suction machine; adding FL7632L and C5608 into a mixer corresponding to the heat-seal layer according to the weight ratio of 1:0.5, adding SPER6 into a cylinder of the mixer corresponding to the heat-seal layer, wherein the weight of the added SPER6 is 4.5-5.5% of the total weight of the raw materials of the heat-seal layer;
step 2) screw extrusion: adjusting the processing temperature of the extruder to 230-270 ℃ to enable the raw materials to reach a molten state, then pushing the raw materials to move forward by a screw rod, and enabling the raw materials to enter a die head after passing through a filter screen;
step 3) die lip extrusion: controlling the temperature of the die head to be 210-240 ℃, controlling the temperature of the molten mass to be 250-280 ℃, and extruding the three layers of molten raw materials in a horizontal flow mode through a die lip after the three layers of molten raw materials are converged in the die head;
step 4) tape casting: controlling the temperature of the casting roller to be 25-40 ℃, and carrying out quenching forming on the raw material in a molten state on the casting roller under the action of negative pressure of a vacuum chamber;
step 05) corona treatment: carrying out corona treatment on the surface of the casting film, wherein the dyne on the surface of the casting film after the treatment is more than 40, and the corona value of the casting film can be kept more than 38 dynes after 30 days of treatment;
step 06), rolling and curing: placing the wound film roll on a curing frame, and curing for 48-72 hours to be stable;
the cast film has a haze index of not greater than 3 and a coefficient of friction of not greater than 0.15.
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| CN101367281B (en) * | 2008-07-22 | 2011-08-31 | 黄山永新股份有限公司 | Low-temperature heat-sealing polypropylene film and preparation method thereof |
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