CN113085316B - Super-transparent screen protective film and production method thereof - Google Patents

Super-transparent screen protective film and production method thereof Download PDF

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Publication number
CN113085316B
CN113085316B CN202110522182.9A CN202110522182A CN113085316B CN 113085316 B CN113085316 B CN 113085316B CN 202110522182 A CN202110522182 A CN 202110522182A CN 113085316 B CN113085316 B CN 113085316B
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film
surface layer
agent
polypropylene
nucleating agent
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CN113085316A (en
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邵峥
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Zhejiang Jinrui Film Material Co ltd
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Zhejiang Jinrui Film Material Co ltd
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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
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/08—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the cooling method
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
    • B32B2038/0028—Stretching, elongating
    • 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
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Laminated Bodies (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

The invention discloses a super-transparent screen protective film, which consists of a lower surface layer, a middle core layer and an upper surface layer, wherein the lower surface layer consists of polypropylene copolymer and an anti-adhesion agent; the middle core layer consists of homopolymerized polypropylene, an antistatic agent and a transparent nucleating agent; the upper surface layer consists of homopolymerized polypropylene and an anti-blocking agent. After the transparent nucleating agent is added into polypropylene, the crystallization ratio and the refined crystal are improved through water bath and stretching, the mechanical property and the bearing property are greatly improved, and after the crystal is refined, the film has higher transparency and lower haze; through the improvement of the production process, the crystallization form of the film can be adjusted and controlled, the film is fine and uniform in crystallization and dense in crystal nucleus through the process treatment, the light scattering of the film is reduced, and the light transmittance is high.

Description

Super-transparent screen protective film and production method thereof
Technical Field
The invention relates to the technical field of screen protection films, in particular to an ultra-transparent screen protection film and a production method thereof.
Background
At any time, with the technical progress and the improvement of living standard, electronic products are more and more popular in daily production and life of people, and especially, mobile phones are almost one hand. The high-permeability film is widely applied to mobile phones and displays and is used for protecting screens of electronic products;
at present, a PE (polyethylene) pressure-sensitive adhesive protective film is widely applied to surface protection of materials, and the PE protective film generally does not need release paper and is low in price. However, the tensile strength of the PE protective film is not good, and when the PE protective film is used, when the PE protective film is attached to a material to be protected, if the operator applies a slight force unevenly, the PE protective film will be stretched in an oriented manner, and in addition, since PE belongs to a linear structure polymer, the PE protective film is too soft, the stiffness is not good enough, the PE protective film is not easy to operate when in use, and the transparency is poor; the PET protective film is also widely used for protecting screens, but the PET protective film is not easy to operate when being too thin, and is easy to tilt when being stuck on the surface of glass or other materials with radian because of high stiffness of PET after being thick.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to: provided are a super-transparent screen protective film and a method for manufacturing the same.
In order to solve the problems, the technical solution of the invention is as follows: super screen protection film that passes through, it comprises lower top layer, middle sandwich layer and top layer, wherein:
the lower surface layer consists of copolymerized polypropylene and an anti-blocking agent;
the middle core layer consists of homopolymerized polypropylene, an antistatic agent and a transparent nucleating agent;
the upper surface layer consists of homopolymerized polypropylene and an anti-blocking agent.
Further, the anti-blocking agent is a polysiloxane polymer.
Further, the transparent nucleating agent is a mixture containing sorbitol acetal and nano silicon dioxide precursors.
The production method of the ultra-transparent screen protection film comprises the following steps:
(1) carrying out grafting reaction on a nano silicon dioxide precursor and hydroxyl with a sorbitol acetal symmetrical structure to prepare a composite transparent nucleating agent with a nano particle as an inner core and an active auxiliary agent as an outer shell;
(2) dissolving the transparent nucleating agent in supercritical carbon dioxide, conveying the solution to the interior of the homopolymerized polypropylene in a molecular form, and then mixing the antistatic agent with the homopolymerized polypropylene and the transparent nucleating agent;
(3) independently mixing the raw materials of the upper surface layer and the lower surface layer;
(4) respectively feeding the raw materials of the upper surface layer, the middle core layer and the lower surface layer into respective extruders for melting, mixing and plasticizing;
(5) respectively sending the molten melts into three layers of die heads, and forming molten sheets through a flat die head opening after the melts are converged in the die heads;
(6) attaching the sheet to a chill roll by using an air knife, cooling the sheet in water bath, and shaping the sheet to form a cast sheet;
(7) after dewatering the surface of the cast sheet, respectively passing through a longitudinal drawing machine and a transverse drawing machine, and drawing the sheet into a film;
(8) after cooling the film, passing through a tractor, measuring the thickness of the film, then carrying out edge cutting treatment, and mixing and crushing leftover materials obtained by edge cutting;
(9) carrying out corona treatment on the surface of the film and then rolling;
(10) and cutting the large film roll into finished products after aging treatment, and then packaging the finished products.
Further, in the step (6), the water bath temperature at the time of casting the sheet was 55 ℃.
Further, in the step (7), the preheating temperature of the longitudinal drawing machine is 135-145 ℃, the drawing temperature is 130-135 ℃, and the drawing magnification is 4.8-5.0; the preheating temperature of the transverse drawing machine is 165-175 ℃, the drawing temperature is 149-159 ℃, the drawing ratio is 9.2-10, and the heat setting temperature is 160-165 ℃.
Further, in the step (8), a sample strip with the width of 60mm is cut along the transverse direction of the film during thickness measurement, the electric sensing thickness gauge is used for uniformly measuring one point every 8mm in the effective width range of the film, the surfaces of the sample strip and a measuring head of the electric sensing thickness gauge are free of oil stains and wrinkles, and the zero point of the electric sensing thickness gauge is rechecked after measuring 30 points.
The invention has the beneficial effects that: after the transparent nucleating agent is added into polypropylene, the crystallization ratio and the refined crystal are improved through water bath and stretching, the mechanical property and the bearing property are greatly improved, and after the crystal is refined, the film has higher transparency and lower haze; through the improvement of the production process, the crystallization form of the film can be adjusted and controlled, the film is fine and uniform in crystallization and dense in crystal nucleus through the process treatment, the light scattering of the film is reduced, and the light transmittance is high.
Detailed Description
For a more intuitive and complete understanding of the technical solution of the present invention, non-limiting features are described as follows:
the first embodiment is as follows: super screen protection film that passes through, it comprises lower top layer, middle sandwich layer and top layer, wherein:
the lower surface layer comprises the following components in percentage by mass: 99% of copolymerized polypropylene and 1% of anti-blocking agent;
the middle core layer comprises the following components in percentage by mass: 97% of homopolymerized polypropylene, 1% of antistatic agent and 2% of transparent nucleating agent;
the upper surface layer comprises the following components in percentage by mass: 99% of homo-polypropylene and 1% of anti-blocking agent.
The anti-blocking agent is a polysiloxane polymer.
The transparent nucleating agent is a mixture containing sorbitol acetal and nano silicon dioxide precursors.
The production method of the ultra-transparent screen protection film comprises the following steps:
(1) carrying out grafting reaction on a nano silicon dioxide precursor and hydroxyl with a sorbitol acetal symmetrical structure to prepare a composite transparent nucleating agent with a nano particle as an inner core and an active auxiliary agent as an outer shell;
(2) dissolving the transparent nucleating agent in supercritical carbon dioxide, conveying the solution to the interior of the homopolymerized polypropylene in a molecular form, and then mixing the antistatic agent with the homopolymerized polypropylene and the transparent nucleating agent;
(3) independently mixing the raw materials of the upper surface layer and the lower surface layer;
(4) respectively feeding the raw materials of the upper surface layer, the middle core layer and the lower surface layer into respective extruders for melting, mixing and plasticizing;
(5) respectively sending the molten melts into three layers of die heads, and forming molten sheets through a flat die head opening after the melts are converged in the die heads;
(6) attaching the sheet to a chill roll by using an air knife, cooling the sheet in water bath, and shaping the sheet to form a cast sheet;
(7) after dewatering the surface of the cast sheet, respectively passing through a longitudinal drawing machine and a transverse drawing machine, and drawing the sheet into a film;
(8) after cooling the film, passing through a tractor, measuring the thickness of the film, then carrying out edge cutting treatment, and mixing and crushing leftover materials obtained by edge cutting;
(9) carrying out corona treatment on the surface of the film and then rolling;
(10) and cutting the large film roll into finished products after aging treatment, and then packaging the finished products.
In the step (1), the prepared composite transparent nucleating agent can play an asymmetric structure effect so as to overcome the problems of odor and bubbles generated by sorbitol acetal in polypropylene.
In the step (2), because the polarity of the transparent nucleating agent is greater than that of the polypropylene, the transparent nucleating agent is aggregated and uniformly distributed in the form of nano particles, and the aim of improving the nucleating efficiency of the transparent nucleating agent is fulfilled. In the process of polypropylene crystallization, the transparent nucleating agent dispersed in a nano state can effectively improve the crystallinity of polypropylene, improve the transparency of products and overcome the defects of poor dispersion, large using amount and low nucleating efficiency of the existing transparent nucleating agent.
In the step (6), the water bath temperature was 55 ℃ at the time of casting the sheet. In order to promote polypropylene to form fine crystals by using the nucleating agent, the temperature of the cast piece in water bath needs to reach 55 ℃, a large amount of large-particle crystals are formed through the water bath, then the large-particle crystals are longitudinally pulled through a high stretching ratio to be converted into fine crystals, and the forming treatment and the aging treatment are carried out after the stretching, so that the crystallization ratio is further improved.
In the step (7), the preheating temperature of the longitudinal drawing machine is 135 ℃, the drawing temperature is 130 ℃, and the drawing ratio is 4.8; the preheating temperature of the transverse drawing machine is 165 ℃, the drawing temperature is 149 ℃, the drawing ratio is 9.2, and the heat setting temperature is 160 ℃.
In the step (8), a sample strip with the width of 60mm is cut along the transverse direction of the film during thickness measurement, an electric sensing thickness gauge is used for uniformly measuring one point every 8mm within the effective width range of the film, the surfaces of measuring heads of the sample strip and the electric sensing thickness gauge are free from oil stains and wrinkles, and the zero point of the electric sensing thickness gauge is checked again after measuring 30 points. The number of measurement points is more, it gets some comparatively evenly, and thickness measurement result is comparatively accurate.
Example two: super screen protection film that passes through, it comprises lower top layer, middle sandwich layer and top layer, wherein:
the lower surface layer comprises the following components in percentage by mass: 98.5 percent of polypropylene copolymer and 1.5 percent of anti-blocking agent;
the middle core layer comprises the following components in percentage by mass: 96% of homopolymerized polypropylene, 1.5% of antistatic agent and 2.5% of transparent nucleating agent;
the upper surface layer comprises the following components in percentage by mass: 98.5 percent of homo-polypropylene and 1.5 percent of anti-blocking agent.
The anti-blocking agent is a polysiloxane polymer.
The transparent nucleating agent is a mixture containing sorbitol acetal and nano silicon dioxide precursors.
The production method of the ultra-transparent screen protection film comprises the following steps:
(1) carrying out grafting reaction on a nano silicon dioxide precursor and hydroxyl with a sorbitol acetal symmetrical structure to prepare a composite transparent nucleating agent with a nano particle as an inner core and an active auxiliary agent as an outer shell;
(2) dissolving the transparent nucleating agent in supercritical carbon dioxide, conveying the transparent nucleating agent to the interior of PP in a molecular form, conveying the transparent nucleating agent to the interior of homo-polypropylene in a molecular form, and then mixing the antistatic agent with the homo-polypropylene and the transparent nucleating agent;
(3) independently mixing the raw materials of the upper surface layer and the lower surface layer;
(4) respectively feeding the raw materials of the upper surface layer, the middle core layer and the lower surface layer into respective extruders for melting, mixing and plasticizing;
(5) respectively sending the molten melts into three layers of die heads, and forming molten sheets through a flat die head opening after the melts are converged in the die heads;
(6) attaching the sheet to a chill roll by using an air knife, cooling the sheet in water bath, and shaping the sheet to form a cast sheet;
(7) after the surface of the cast sheet is dewatered, drawing the sheet into a film through a longitudinal drawing machine and a transverse drawing machine respectively;
(8) after cooling the film, passing through a tractor, measuring the thickness of the film, then carrying out edge cutting treatment, and mixing and crushing leftover materials obtained by edge cutting;
(9) carrying out corona treatment on the surface of the film and then rolling;
(10) and cutting the large film roll into finished products after aging treatment, and then packaging the finished products.
In the step (1), the prepared composite transparent nucleating agent can play an asymmetric structure effect so as to overcome the problems of odor and bubbles generated by sorbitol acetal in polypropylene.
In the step (2), because the polarity of the transparent nucleating agent is greater than that of the polypropylene, the transparent nucleating agent is aggregated and uniformly distributed in the form of nano particles, and the aim of improving the nucleating efficiency of the transparent nucleating agent is fulfilled. In the process of polypropylene crystallization, the transparent nucleating agent dispersed in a nano state can effectively improve the crystallinity of polypropylene, improve the transparency of products and overcome the defects of poor dispersion, large dosage and low nucleating efficiency of the existing transparent nucleating agent.
In the step (6), the water bath temperature was 55 ℃ at the time of casting the sheet. In order to promote polypropylene to form fine crystals by using the nucleating agent, the temperature of the cast piece in water bath needs to reach 55 ℃, a large amount of large-particle crystals are formed through the water bath, then the large-particle crystals are longitudinally pulled through a high stretching ratio to be converted into fine crystals, and the forming treatment and the aging treatment are carried out after the stretching, so that the crystallization ratio is further improved.
In the step (7), the preheating temperature of the longitudinal drawing machine is 145 ℃, the drawing temperature is 135 ℃, and the drawing ratio is 5.0; the preheating temperature of the transverse drawing machine is 175 ℃, the drawing temperature is 159 ℃, the drawing ratio is 10, and the heat setting temperature is 165 ℃.
Example three: the difference between the third embodiment and the first embodiment is that: in the step (7), the preheating temperature of the longitudinal drawing machine is 140 ℃, the drawing temperature is 133 ℃, and the drawing multiplying power is 4.9; the preheating temperature of the transverse drawing machine is 170 ℃, the drawing temperature is 155 ℃, the drawing ratio is 9.5, and the heat setting temperature is 162 ℃.
Example four: the difference between the fourth embodiment and the first embodiment is that: the lower surface layer comprises the following components in percentage by mass: 99.5 percent of copolymerized polypropylene and 0.5 percent of anti-blocking agent; the upper surface layer comprises the following components in percentage by mass: 99.5 percent of homopolymerized polypropylene and 0.5 percent of anti-blocking agent.
Example five: the difference between the fifth embodiment and the first embodiment is that: the lower surface layer comprises the following components in percentage by mass: 98% of polypropylene copolymer and 2% of anti-blocking agent; the upper surface layer comprises the following components in percentage by mass: 98% of homo-polypropylene and 2% of anti-blocking agent.
Comparative example one: the difference between the first comparative example and the third example is that: the lower surface layer comprises the following components in percentage by mass: 100% of copolymerized polypropylene; the upper surface layer comprises the following components in percentage by mass: 100% of homopolymerized polypropylene.
Comparative example two: the difference between the second comparative example and the third example is that: the anti-blocking agent is silicon dioxide.
Comparative example three: the difference between the third comparative example and the third example is that: the anti-blocking agent is glass beads.
The films obtained in examples one to five and comparative examples one to three were subjected to optical property tests, and the test results are shown in the following table:
group of Transparency (%) Haze (%)
Example one 98.9 0.41
Example two 98.7 0.43
EXAMPLE III 99.0 0.37
Example four 98.2 0.49
EXAMPLE five 98.4 0.47
Comparative example 1 97.2 0.52
Comparative example No. two 96.2 0.61
Comparative example No. three 98.0 0.50
As can be seen from the above table, when the anti-blocking agent components of the lower surface layer and the upper surface layer are 1% by mass, the preheating temperature of the longitudinal drawing machine is 145 ℃, the drawing temperature is 135 ℃, and the drawing ratio is 5.0; the preheating temperature of the transverse drawing machine is 175 ℃, the stretching temperature is 159 ℃, the stretching ratio is 10, and the light transmittance of the prepared film is higher when the heat setting temperature is 165 ℃; under the conditions of unchanged proportion, consistent stretching temperature, stretching ratio and the like, the different kinds of anti-blocking agents select polysiloxane polymers as the anti-blocking agents, so that the light transmittance is higher.

Claims (3)

1. Super screen protection film that passes through, its characterized in that: it comprises lower surface layer, middle sandwich layer and upper surface layer, wherein:
the lower surface layer consists of copolymerized polypropylene and an anti-blocking agent;
the middle core layer consists of homopolymerized polypropylene, an antistatic agent and a transparent nucleating agent;
the upper surface layer consists of homopolymerized polypropylene and an anti-blocking agent;
the anti-blocking agent is polysiloxane polymer; the transparent nucleating agent is a mixture containing sorbitol acetal and a nano silicon dioxide precursor;
the production method of the ultra-transparent screen protection film comprises the following steps:
(1) carrying out grafting reaction on a nano silicon dioxide precursor and hydroxyl with a sorbitol acetal symmetrical structure to prepare a composite transparent nucleating agent with a nano particle as an inner core and an active auxiliary agent as an outer shell;
(2) dissolving the transparent nucleating agent in supercritical carbon dioxide, conveying the solution to the interior of the homopolymerized polypropylene in a molecular form, and then mixing the antistatic agent with the homopolymerized polypropylene and the transparent nucleating agent;
(3) independently mixing the raw materials of the upper surface layer and the lower surface layer;
(4) respectively feeding the raw materials of the upper surface layer, the middle core layer and the lower surface layer into respective extruders for melting, mixing and plasticizing;
(5) respectively sending the molten melts into three layers of die heads, and forming molten sheets through a flat die head opening after the melts are converged in the die heads;
(6) attaching the sheet to a chill roll by using an air knife, cooling the sheet in water bath, and shaping the sheet to form a cast sheet;
(7) after dewatering the surface of the cast sheet, respectively passing through a longitudinal drawing machine and a transverse drawing machine, and drawing the sheet into a film;
(8) after cooling the film, passing through a tractor, measuring the thickness of the film, then carrying out edge cutting treatment, and mixing and crushing leftover materials obtained by edge cutting;
(9) carrying out corona treatment on the surface of the film and then rolling;
(10) the large film roll is subjected to aging treatment and then cut into finished products, and then the finished products are packaged;
in the step (8), a sample strip with the width of 60mm is cut along the transverse direction of the film during thickness measurement, an electric sensing thickness gauge is used for uniformly measuring one point every 8mm within the effective width range of the film, the surfaces of measuring heads of the sample strip and the electric sensing thickness gauge are free from oil stains and wrinkles, and the zero point of the electric sensing thickness gauge is checked again after measuring 30 points.
2. The super-transparent screen protective film according to claim 1, wherein: in the step (6), the water bath temperature was 55 ℃ at the time of casting the sheet.
3. The super-transparent screen protective film according to claim 1, wherein: in the step (7), the preheating temperature of the longitudinal drawing machine is 135-145 ℃, the drawing temperature is 130-135 ℃, and the drawing magnification is 4.8-5.0; the preheating temperature of the transverse drawing machine is 165-175 ℃, the drawing temperature is 149-159 ℃, the drawing ratio is 9.2-10, and the heat setting temperature is 160-165 ℃.
CN202110522182.9A 2021-05-13 2021-05-13 Super-transparent screen protective film and production method thereof Active CN113085316B (en)

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US20070060696A1 (en) * 2005-09-12 2007-03-15 Jiang Li Silica-containing nucleating agent compositions and methods for using such compositions in polyolefins
CN108943940B (en) * 2018-08-01 2020-08-18 宁波瑞成包装材料有限公司 High-barrier visible heavy packaging composite film and production method thereof

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