Low-fog low-roughness anti-sideslip film corona equipment and film production process

Abstract

The invention discloses low-fog low-roughness anti-sideslip film corona equipment and a film production technology.The corona equipment comprises a corona device and a corona roller, the surface of a roller of the corona roller is coated with a silica gel layer, and the surface of the silica gel layer is provided with a plurality of annular grooves around the circumferential track of the roller; the annular grooves are evenly arranged at intervals in the transverse direction of the corona roller cylinder, and the transverse direction is the axial direction of the corona roller cylinder. The silica gel layer with the annular groove is arranged on the surface of the roller of the corona roller, and pressure control between the corona roller and a film is matched, so that a special corona effect can be achieved, and the sideslip prevention capability of the film surface can be improved; compared with a product prepared by a conventional corona roller without an annular groove in the surface, the static friction coefficient of the product prepared by the invention in the transverse direction (MD direction) is larger and is 1.2-1.5 times that of different products, the problems of rolling sideslip and edge series of low-haze and low-roughness products can be effectively solved, and the corona roller has a very good market application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of film manufacturing, and in particular to a low-fog, low-roughness, anti-skid film corona device and a film production process. Background Art

[0002] Because BOPET (biaxially oriented polyester film) has excellent comprehensive properties, its application field is very wide, and the most common is printing, laminating, vacuum aluminizing, etc. However, in order to further improve the bonding force between the printing ink or vacuum aluminizing layer and the surface of the BOPET film and increase the adhesion strength, it is often necessary to surface treat the BOPET film to increase the wetting tension of the BOPET film, thereby enhancing the printing and aluminizing effect of the BOPET film. The methods for surface treatment of plastic films include: corona treatment, chemical treatment, mechanical roughening, coating, flame treatment, etc., among which the most commonly used is corona treatment. The basic principle of the corona treatment method is: by applying a high-frequency, high-voltage power supply between a metal electrode and a corona treatment roller (generally a high-temperature resistant, ozone resistant, and highly insulating silicone rubber roller), a discharge is generated, thereby ionizing the air and forming a large amount of ozone. At the same time, high-energy electric sparks impact the film surface. Under their joint action, the surface of the plastic film is activated and the surface energy is increased. The wetting tension of the BOPET film can reach 52-56mN / m or even higher through corona treatment.

[0003] At present, when producing low-roughness, high-transmittance, low-haze products such as MLCC, due to the very low surface roughness of the film, lateral slippage will occur between the layers of the film when the product is rolled up. In order to solve the above-mentioned slippage phenomenon of the product, the industry often uses online coating methods to increase the product's anti-slip ability, but this method will increase the cost of production; or increase the number or particle size (above 2nm) of anti-slip particles (silicon dioxide, calcium carbonate, barium sulfate and other inorganic particles) on the surface of the product, but the addition of these particles will cause high haze and high roughness of the product. Therefore, it is now necessary to improve the existing technology to provide a more reliable solution. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a low-fog, low-roughness, anti-skid film corona equipment and a film production process in view of the deficiencies in the above-mentioned prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: in the first aspect of the present invention, a low-fog, low-roughness and anti-skid thin-film corona equipment is provided, including a corona device and a corona roller, the surface of the corona roller is coated with a silicone layer, and the surface of the silicone layer is provided with a plurality of annular grooves around the circumferential trajectory of the roller, and the plurality of annular grooves are evenly spaced along the transverse direction of the corona roller, and the transverse direction is the axial direction of the corona roller.

[0006] Preferably, the annular groove has a width of 1 to 2 mm and a depth of 0.5 to 1 mm.

[0007] Preferably, the spacing between adjacent annular grooves is 3-10 mm.

[0008] Preferably, the device further comprises a pressing roller for pressing the film onto the corona roller.

[0009] Preferably, the corona device is provided with electrodes for performing corona treatment on the film, and the film is placed between the electrodes and the corona roller.

[0010] The second aspect of the present invention provides a production process for a low-fog, low-roughness anti-skid film, which uses the corona equipment as described above to perform corona treatment on the prepared film, so that a plurality of corona stripes protruding from the surface of the film and matching the annular grooves on the surface of the corona roller are formed on the surface of the film, the corona stripes extend longitudinally along the film, and the plurality of corona stripes are evenly spaced laterally along the film.

[0011] Preferably, the production process of the low-fog and low-roughness anti-skid film comprises the following steps:

[0012] S1, preparing a thin film substrate;

[0013] S2, performing corona treatment on the prepared film using the corona equipment as described above;

[0014] Among them, the corona power of the corona device is controlled at ≥6Wmin / ㎡.

[0015] Preferably, the surface pressure of the pressure roller is controlled at 0.4-1.4 kgf / cm 2 .

[0016] Preferably, the film substrate is an ABA three-layer structure, layer B is a core layer, and layer A is a surface application layer;

[0017] The raw materials for preparing layer A include polyester particles and anti-skid inorganic particles, and the raw materials for preparing layer B are polyester particles;

[0018] Wherein, the anti-slip inorganic particles are selected from at least one of silicon dioxide, calcium carbonate and barium sulfate.

[0019] Preferably, step S1 specifically comprises:

[0020] S1-1, using polyester particles and anti-skid inorganic particles with a particle size of 0.2 to 1.5 nm as the raw materials for layer A, the added concentration of the anti-skid inorganic particles is 600 to 1500 ppm; using polyester particles as the raw material for layer B;

[0021] S1-2, melt extrusion: the raw materials of layer A and layer B are melt extruded through their respective extruders to form an ABA three-layer structure at an extrusion temperature of 275-285°C;

[0022] S1-3, sheet casting: the product obtained in step S1-2 is cast into sheets on a cold drum, the cold drum temperature is 20-30°C;

[0023] S1-4, longitudinal stretching: preheat the cast sheet obtained in step S1-3 at 62-80°C, then longitudinally stretch it at 75-82°C with a stretching ratio of 1.8-3.5, and then cool it at 20-30°C to obtain a longitudinally stretched sheet;

[0024] S1-5, transverse stretching: preheat the longitudinally stretched sheet at 95-112°C, then transversely stretch it at 110-230°C with a stretching ratio of 3-4.5, and then cool it at 120-50°C. The transverse shrinkage rate of the film in the cooling zone is 1%-3%, and finally a film substrate is obtained.

[0025] The beneficial effects of the present invention are:

[0026] The invention provides a low-fog, low-roughness, anti-skidding film corona device and a film production process based on the device. The invention can achieve a special corona effect and increase the anti-skidding ability of the film surface by arranging a silicone layer with annular grooves on the surface of a corona roller and controlling the pressure between the corona roller and the film. Specifically, the invention controls the surface pressure of a pressure roller to generate longitudinal gaps uniformly distributed in the transverse direction at the place where the film and the corona roller with annular grooves on the surface contact each other. The existence of these gaps can cause electron agglomeration when the film passes through the corona electrode. This will cause the corona effect of the place with pores to be different from the corona effect of the place without gaps, thereby generating different corona effects, thereby generating corona strips on the film in the running direction of the film, that is, in the longitudinal direction. These corona strips can significantly enhance the anti-skidding ability of the film. Compared with products prepared by conventional corona rollers without annular grooves on the surface, the products prepared by the invention have a larger static friction coefficient in the transverse direction (MD direction), which is 1.2-1.5 times that of different products, can effectively solve the problem of side slip and edge stringing during winding of low-fog and low-roughness products, and have good market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the low-fog, low-roughness and anti-skid thin-film corona device of the present invention;

[0028] Figure 2 It is a schematic diagram of the silicone layer on the surface of the corona roller in the present invention after being expanded along the circumference direction;

[0029] Figure 3This is a comparison chart of the surface corona effects of the films prepared in Example 3 and Comparative Example 4 of the present invention.

[0030] Description of reference numerals:

[0031] 0—film; 1—corona roller; 2—pressure roller; 3—corona device; 4—electrode. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0033] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0034] The test methods used in the following examples are conventional methods unless otherwise specified. The materials and reagents used in the following examples are all commercially available unless otherwise specified. In the following examples, if no specific conditions are specified, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used, if the manufacturer is not specified, are all conventional products that can be purchased commercially.

[0035] Reference Figure 1 The present invention provides a low-fog, low-roughness, anti-skid thin-film corona device, comprising a corona device 3 and a corona roller 1. The surface of the corona roller 1 is coated with a silicone layer, and the surface of the silicone layer is provided with a plurality of annular grooves around the circumferential trajectory of the roller. The plurality of annular grooves are evenly spaced along the transverse direction (TD direction) of the corona roller 1, and the transverse direction is the axial direction of the corona roller 1.

[0036] Reference Figure 2 , which is a schematic diagram of the silicone layer after it is unfolded along the circumference direction.

[0037] In a preferred embodiment, the annular groove has a width of 1 to 2 mm and a depth of 0.5 to 1 mm.

[0038] In a preferred embodiment, the spacing between adjacent annular grooves is 3-10 mm.

[0039] In a preferred embodiment, the device further comprises a pressing roller 2, which is used to press the film onto the corona roller 1. Cylinders are respectively arranged on both sides of the pressing roller 2, and the cylinders can adjust the surface pressure of the pressing roller 2 on the film.

[0040] In a preferred embodiment, the corona device 3 is provided with an electrode 4 for performing corona treatment on the film, and the film is placed between the electrode 4 and the corona roller 1 .

[0041] Reference Figure 1Specifically, after the film passes through the corona roller 1, the film is pressed onto the corona roller by the pressure roller 2, and then the electrode 4 of the corona device 3 discharges to generate electric sparks to perform corona treatment on the corona surface of the film. Due to the presence of grooves on the surface of the corona roller 1, the surface pressure of the pressure roller 2 is controlled to produce longitudinal gaps evenly distributed in the horizontal direction where the film and the corona roller 1 are in contact. The presence of these gaps will cause electron agglomeration when the film passes through the corona electrode 4; this will cause the corona effect in the pores to be different from the corona effect in the gapless areas, thereby producing different corona effects, thereby causing the film to produce corona stripes in the longitudinal direction (MD direction) along the film running direction (corona stripes evenly distributed in the horizontal direction).

[0042] The present invention also provides a production process for a low-fog, low-roughness anti-skid film, which uses the above-mentioned corona equipment to perform corona treatment on the prepared film, so that a plurality of corona stripes protruding from the surface of the film and matching the annular grooves on the surface of the corona roller 1 are formed on the surface of the film, and the corona stripes extend longitudinally along the film, and the plurality of corona stripes are evenly spaced apart in the transverse direction of the film.

[0043] In a preferred embodiment, the production process of the low-fog and low-roughness anti-skid film comprises the following steps:

[0044] S1, preparing a thin film substrate;

[0045] S2, corona treating the prepared film using a corona device as described in any one of claims 1 to 5;

[0046] Among them, the corona power of corona device 3 is controlled at ≥6Wmin / ㎡.

[0047] In a preferred embodiment, the surface pressure of the pressure roller 2 is controlled at 0.4-1.4 kgf / cm 2 .

[0048] In a preferred embodiment, the film substrate is an ABA three-layer structure, wherein layer B is a core layer and layer A is a surface application layer;

[0049] The raw materials for preparing layer A include polyester particles and anti-skid inorganic particles, and the raw materials for preparing layer B are polyester particles;

[0050] Wherein, the anti-slip inorganic particles are selected from at least one of silicon dioxide, calcium carbonate and barium sulfate.

[0051] In a preferred embodiment, step S1 is specifically as follows:

[0052] S1-1, using polyester particles and anti-skid inorganic particles with a particle size of 0.2 to 1.5 nm as the raw materials for layer A, the added concentration of the anti-skid inorganic particles is 600 to 1500 ppm; using polyester particles as the raw material for layer B;

[0053] S1-2, melt extrusion: the raw materials of layer A and layer B are melt extruded through their respective extruders to form an ABA three-layer structure at an extrusion temperature of 275-285°C;

[0054] S1-3, sheet casting: the product obtained in step S1-2 is cast into sheets on a cold drum, the cold drum temperature is 20-30°C;

[0055] S1-4, longitudinal stretching: preheat the cast sheet obtained in step S1-3 at 62-80°C, then longitudinally stretch it at 75-82°C with a stretching ratio of 1.8-3.5, and then cool it at 20-30°C to obtain a longitudinally stretched sheet;

[0056] S1-5, transverse stretching: preheat the longitudinally stretched sheet at 95-112°C, then transversely stretch it at 110-230°C with a stretching ratio of 3-4.5, and then cool it at 120-50°C. The transverse shrinkage rate of the film in the cooling zone is 1%-3%, and finally a film substrate is obtained.

[0057] In a preferred embodiment, the haze of the film product prepared by the present invention is ≤0.8; the roughness RA ≤20nm, and RZ ≤200nm.

[0058] In a preferred embodiment, the static friction coefficient of the film product prepared by the present invention measured in the transverse direction (TD direction) is more than 1.2 times that of the corona method of the ordinary corona roller 1 (smooth surface, no annular grooves).

[0059] The above is the overall concept of the present invention, and detailed embodiments and comparative examples are provided below on the basis of the overall concept of the present invention to further illustrate the present invention.

[0060] Example 1

[0061] Continue to refer to Figure 1 The present embodiment provides a low-fog, low-roughness, anti-skid thin-film corona device, comprising a corona device 3, a corona roller 1 and a pressure roller 2. The surface of the corona roller 1 is coated with a silicone layer, and the surface of the silicone layer is provided with a plurality of annular grooves around the circumference of the roller. The plurality of annular grooves are evenly spaced in the transverse direction of the corona roller 1, and the transverse direction is the axial direction of the corona roller 1.

[0062] The width of the annular groove is 2 mm, the depth is 1 mm, and the spacing between adjacent annular grooves is 5 mm.

[0063] Cylinders are provided on both sides of the pressure roller 2 ( Figure 1The cylinder can adjust the surface pressure of the pressure roller 2 on the film. The corona device 3 is provided with an electrode 4 for corona treatment of the film, and the film is placed between the electrode 4 and the corona roller 1. After the film passes through the corona roller 1, the film is pressed on the corona roller by the pressure roller 2, and then the electrode 4 of the corona device 3 discharges to generate electric sparks to perform corona treatment on the corona surface of the film.

[0064] Example 2

[0065] A production process of a low-fog and low-roughness anti-skid film, comprising the following steps:

[0066] S1, preparing a thin film substrate;

[0067] S1-1, polyester particles (FG600 of Yizheng Chemical Fiber) and anti-skid inorganic particles (silicon dioxide) with a particle size of 1.5nm are used as raw materials for layer A, and the added concentration of anti-skid inorganic particles is 1500ppm; polyester particles (FG600 of Yizheng Chemical Fiber) are used as raw materials for layer B;

[0068] The film substrate is an ABA three-layer structure, with layer B being the core layer and layer A being the surface application layer;

[0069] S1-2, melt extrusion: the raw materials of layer A and layer B are melt extruded through their respective extruders to form an ABA three-layer structure at an extrusion temperature of 285°C;

[0070] S1-3, sheet casting: the product obtained in step S1-2 is cast into sheets on a cold drum, the cold drum temperature is 26°C;

[0071] S1-4, longitudinal stretching: the cast sheet obtained in step S1-3 is put into MDO for longitudinal stretching, preheated at 70°C, and then longitudinally stretched at 76°C with a stretching ratio of 3.2, and then cooled at 30°C to obtain a longitudinally stretched sheet;

[0072] S1-5, transverse stretching: the longitudinally stretched sheet is sequentially sent into the TDO preheating section, stretching section, shaping section, multifunctional section, and cooling section to prepare a film substrate;

[0073] The temperature of the preheating section is 100°C, the stretching section is 120°C, the shaping section is 230°C, the temperature of the multifunctional section 1 is 180°C, the temperature of the multifunctional section 2 is 160°C, the temperature of the cooling section 1 is 100°C, the temperature of the cooling section 2 is 50°C, the transverse stretching ratio is 4.1, and the transverse shrinkage of the film in the cooling zone is 1.5%;

[0074] S2, using the corona equipment of Example 1 to perform corona treatment on the prepared film, and finally winding it through a winder to obtain a low-fog, low-roughness, anti-skid film;

[0075] The corona power of the corona device 3 is controlled at 8Wmin / ㎡. The surface pressure of the pressure roller 2 is controlled at 1.0kgf / cm 2 .

[0076] Example 3

[0077] A production process of a low-fog and low-roughness anti-skid film, comprising the following steps:

[0078] S1, preparing a thin film substrate;

[0079] S1-1, polyester particles (FG600 of Yizheng Chemical Fiber) and anti-skid inorganic particles (silicon dioxide) with a particle size of 0.5 nm are used as raw materials for layer A, and the added concentration of the anti-skid inorganic particles is 1500ppm; polyester particles (FG600 of Yizheng Chemical Fiber) are used as raw materials for layer B;

[0080] The film substrate is an ABA three-layer structure, with layer B being the core layer and layer A being the surface application layer;

[0081] S1-2, melt extrusion: the raw materials of layer A and layer B are melt extruded through their respective extruders to form an ABA three-layer structure at an extrusion temperature of 285°C;

[0082] S1-3, sheet casting: the product obtained in step S1-2 is cast into sheets on a cold drum, the cold drum temperature is 26°C;

[0083] S1-4, longitudinal stretching: the cast sheet obtained in step S1-3 is put into MDO for longitudinal stretching, preheated at 70°C, and then longitudinally stretched at 76°C with a stretching ratio of 3.2, and then cooled at 30°C to obtain a longitudinally stretched sheet;

[0084] S1-5, transverse stretching: the longitudinally stretched sheet is sequentially sent into the TDO preheating section, stretching section, shaping section, multifunctional section, and cooling section to prepare a film substrate;

[0085] The temperature of the preheating section is 100°C, the stretching section is 120°C, the shaping section is 230°C, the temperature of the multifunctional section 1 is 180°C, the temperature of the multifunctional section 2 is 160°C, the temperature of the cooling section 1 is 100°C, the temperature of the cooling section 2 is 50°C, the transverse stretching ratio is 4.1, and the transverse shrinkage of the film in the cooling zone is 1.5%;

[0086] S2, using the corona equipment of Example 1 to perform corona treatment on the prepared film, and finally winding it through a winder to obtain a low-fog, low-roughness, anti-skid film;

[0087] The corona power of the corona device 3 is controlled at 8Wmin / ㎡. The surface pressure of the pressure roller 2 is controlled at 0.4kgf / cm 2 .

[0088] Example 4

[0089] A production process of a low-fog and low-roughness anti-skid film, comprising the following steps:

[0090] S1, preparing a thin film substrate;

[0091] S1-1, polyester particles (FG600 of Yizheng Chemical Fiber) and anti-skid inorganic particles (silicon dioxide) with a particle size of 0.5 nm are used as raw materials for layer A, and the added concentration of the anti-skid inorganic particles is 800ppm; polyester particles (FG600 of Yizheng Chemical Fiber) are used as raw materials for layer B;

[0092] The film substrate is an ABA three-layer structure, with layer B being the core layer and layer A being the surface application layer;

[0093] S1-2, melt extrusion: the raw materials of layer A and layer B are melt extruded through their respective extruders to form an ABA three-layer structure at an extrusion temperature of 285°C;

[0094] S1-3, sheet casting: the product obtained in step S1-2 is cast into sheets on a cold drum, the cold drum temperature is 26°C;

[0095] S1-4, longitudinal stretching: the cast sheet obtained in step S1-3 is put into MDO for longitudinal stretching, preheated at 70°C, and then longitudinally stretched at 76°C with a stretching ratio of 3.2, and then cooled at 30°C to obtain a longitudinally stretched sheet;

[0096] S1-5, transverse stretching: the longitudinally stretched sheet is sequentially sent into the TDO preheating section, stretching section, shaping section, multifunctional section, and cooling section to prepare a film substrate;

[0097] The temperature of the preheating section is 100°C, the stretching section is 120°C, the shaping section is 230°C, the temperature of the multifunctional section 1 is 180°C, the temperature of the multifunctional section 2 is 160°C, the temperature of the cooling section 1 is 100°C, the temperature of the cooling section 2 is 50°C, the transverse stretching ratio is 4.1, and the transverse shrinkage of the film in the cooling zone is 1.5%;

[0098] S2, using the corona equipment of Example 1 to perform corona treatment on the prepared film, and finally winding it through a winder to obtain a low-fog, low-roughness, anti-skid film;

[0099] The corona power of the corona device 3 is controlled at 12Wmin / ㎡. The surface pressure of the pressure roller 2 is controlled at 0.4kgf / cm 2 .

[0100] Example 5

[0101] A production process of a low-fog and low-roughness anti-skid film, comprising the following steps:

[0102] S1, preparing a thin film substrate;

[0103] S1-1, polyester particles (FG600 of Yizheng Chemical Fiber) and anti-skid inorganic particles (silicon dioxide) with a particle size of 1.5nm are used as raw materials for layer A, and the added concentration of anti-skid inorganic particles is 1500ppm; polyester particles (FG600 of Yizheng Chemical Fiber) are used as raw materials for layer B;

[0104] The film substrate is an ABA three-layer structure, with layer B being the core layer and layer A being the surface application layer;

[0105] S1-2, melt extrusion: the raw materials of layer A and layer B are melt extruded through their respective extruders to form an ABA three-layer structure at an extrusion temperature of 285°C;

[0106] S1-3, sheet casting: the product obtained in step S1-2 is cast into sheets on a cold drum, the cold drum temperature is 26°C;

[0107] S1-4, longitudinal stretching: the cast sheet obtained in step S1-3 is put into MDO for longitudinal stretching, preheated at 70°C, and then longitudinally stretched at 76°C with a stretching ratio of 3.2, and then cooled at 30°C to obtain a longitudinally stretched sheet;

[0108] S1-5, transverse stretching: the longitudinally stretched sheet is sequentially sent into the TDO preheating section, stretching section, shaping section, multifunctional section, and cooling section to prepare a film substrate;

[0109] The temperature of the preheating section is 100°C, the stretching section is 120°C, the shaping section is 230°C, the temperature of the multifunctional section 1 is 180°C, the temperature of the multifunctional section 2 is 160°C, the temperature of the cooling section 1 is 100°C, the temperature of the cooling section 2 is 50°C, the transverse stretching ratio is 4.1, and the transverse shrinkage of the film in the cooling zone is 1.5%;

[0110] S2, using the corona equipment of Example 1 to perform corona treatment on the prepared film, and finally winding it through a winder to obtain a low-fog, low-roughness, anti-skid film;

[0111] The corona power of the corona device 3 is controlled at 6Wmin / ㎡. The surface pressure of the pressure roller 2 is controlled at 1kgf / cm 2 .

[0112] Example 6

[0113] A production process of a low-fog and low-roughness anti-skid film, comprising the following steps:

[0114] S1, preparing a thin film substrate;

[0115] S1-1, polyester particles (FG600 of Yizheng Chemical Fiber) and anti-skid inorganic particles (silicon dioxide) with a particle size of 1.5nm are used as raw materials for layer A, and the added concentration of anti-skid inorganic particles is 1500ppm; polyester particles (FG600 of Yizheng Chemical Fiber) are used as raw materials for layer B;

[0116] The film substrate is an ABA three-layer structure, with layer B being the core layer and layer A being the surface application layer;

[0117] S1-2, melt extrusion: the raw materials of layer A and layer B are melt extruded through their respective extruders to form an ABA three-layer structure at an extrusion temperature of 285°C;

[0118] S1-3, sheet casting: the product obtained in step S1-2 is cast into sheets on a cold drum, the cold drum temperature is 26°C;

[0119] S1-4, longitudinal stretching: the cast sheet obtained in step S1-3 is put into MDO for longitudinal stretching, preheated at 70°C, and then longitudinally stretched at 76°C with a stretching ratio of 3.2, and then cooled at 30°C to obtain a longitudinally stretched sheet;

[0120] S1-5, transverse stretching: the longitudinally stretched sheet is sequentially sent into the TDO preheating section, stretching section, shaping section, multifunctional section, and cooling section to prepare a film substrate;

[0121] The temperature of the preheating section is 100°C, the stretching section is 120°C, the shaping section is 230°C, the temperature of the multifunctional section 1 is 180°C, the temperature of the multifunctional section 2 is 160°C, the temperature of the cooling section 1 is 100°C, the temperature of the cooling section 2 is 50°C, the transverse stretching ratio is 4.1, and the transverse shrinkage of the film in the cooling zone is 1.5%;

[0122] S2, using the corona equipment of Example 1 to perform corona treatment on the prepared film, and finally winding it through a winder to obtain a low-fog, low-roughness, anti-skid film;

[0123] The corona power of the corona device 3 is controlled at 8Wmin / ㎡. The surface pressure of the pressure roller 2 is controlled at 1.3kgf / cm 2 .

[0124] Comparative Example 1

[0125] Same as Example 2, except that the particle size was changed to 2.5 nm.

[0126] Comparative Example 2

[0127] Same as Example 2, only the corona power was changed and controlled at 5 Wmin / ㎡.

[0128] Comparative Example 3

[0129] The only difference between the corona roller and the corona roller in Example 4 is that there is no silica gel layer on the surface of the corona roller.

[0130] Comparative Example 4

[0131] The only difference between the corona roller 1 and the corona roller in Example 3 is that the corona roller 1 is not formed on the surface of the corona roller.

[0132] Comparative Example 5

[0133] The same as in Example 4 is used except that the corona roller 1 is changed, and a common corona roller is used (that is, the only difference from the corona roller in Example 2 is that there is no silica gel layer on the surface).

[0134] Comparative Example 6

[0135] The only difference between the corona roller 1 and the corona roller in Example 6 is that a common corona roller is used (i.e., the only difference from the corona roller in Example 2 is that there is no silica gel layer on the surface).

[0136] Comparative Example 7

[0137] The same as in Comparative Example 1, only the corona roller 1 was changed, and a common corona roller was used (that is, the only difference from the corona roller of Example 2 is that there is no silica gel layer on the surface).

[0138] Reference Figure 3 , which is a comparison diagram of the surface corona effects of the films prepared in Example 3 and Comparative Example 4.

[0139] The following performance tests were performed on the film products prepared in the examples and comparative examples:

[0140] (1) Polyester film roughness: according to the test standard ISO1997;

[0141] (2) Polyester film haze: according to the test standard ASTM D1003;

[0142] (3) Friction coefficient of polyester film: According to the test standard ASTM D1894; the friction direction during measurement is the TD direction of the film, that is, perpendicular to the Figure 3 The direction of the "corona strip";

[0143] (4) Side slip (edge ​​stringing) phenomenon during winding: visual inspection.

[0144] The test results are shown in the following table:

[0145] Table 1

[0146]

[0147]

[0148] According to the test results in Table 1, the film products prepared in Examples 2-6 have the advantages of low haze, high light transmittance, low roughness, etc., and have good anti-skid effect;

[0149] Comparison between Comparative Example 1 and Example 2 shows that if the particle size of the anti-skid inorganic particles is too large, the roughness of the product will exceed the standard.

[0150] From the comparison of the two groups of data of Examples 2-6 and Comparative Examples 1-7, it can be seen that when the corona roller 1 of Example 1 is used for corona treatment, and appropriate corona power and surface pressure of the corona roller 2 are used, the side slip can be well prevented.

[0151] By comparing comparative example 1 with comparative example 7, it can be seen that, when all data remain unchanged, only the corona roller 1 of embodiment 1 is used in comparative example 1, the product can achieve a good anti-skid effect.

[0152] By comparing Comparative Example 6 with Comparative Example 7, it can be seen that increasing the particle size of the anti-skid inorganic particles can achieve a certain anti-skid effect, but it will cause the product to become rough and haze larger, resulting in unqualified products.

[0153] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to specific details.

Claims

1. A low-fog, low-roughness, anti-skid film corona device, characterized in that: It includes a corona device and a corona roller. The surface of the corona roller is covered with a silicone layer. The surface of the silicone layer is provided with a plurality of annular grooves around the circumference of the roller. The plurality of annular grooves are evenly spaced in the transverse direction of the corona roller. The transverse direction is the axial direction of the corona roller.

2. The low-fog, low-roughness, anti-skid film corona device according to claim 1, characterized in that: The width of the annular groove is 1 to 2 mm, and the depth is 0.5 to 1 mm.

3. The low-fog, low-roughness, anti-skid film corona device according to claim 2, characterized in that: The spacing between adjacent annular grooves is 3-10 mm.

4. The low-fog, low-roughness, anti-skid film corona device according to claim 1, characterized in that: The device also includes a pressing roller, which is used to press the film onto the corona roller.

5. The low-fog, low-roughness, anti-skid film corona device according to claim 4, characterized in that: The corona device is provided with electrodes for performing corona treatment on the film, and the film is placed between the electrodes and the corona roller.

6. A production process for a low-fog, low-roughness, anti-skid film, characterized in that: The corona treatment is performed on the prepared film using the corona device as described in any one of claims 1 to 5, so that a plurality of corona stripes protruding from the surface of the film and matching the annular grooves on the surface of the corona roller are formed on the surface of the film, the corona stripes extend longitudinally along the film, and the plurality of corona stripes are evenly spaced laterally along the film.

7. The production process of the low-fog and low-roughness anti-skid film according to claim 6, characterized in that: The process includes the following steps: S1, preparing a thin film substrate; S2. performing corona treatment on the prepared film using the corona device as described in any one of claims 1 to 5; Among them, the corona power of the corona device is controlled at ≥6Wmin / ㎡.

8. The production process of the low-fog and low-roughness anti-skid film according to claim 7, characterized in that: The surface pressure of the pressure roller is controlled at 0.4~1.4kgf / cm 2 .

9. The production process of the low-fog and low-roughness anti-skid film according to claim 6, characterized in that: The film substrate is an ABA three-layer structure, layer B is the core layer, and layer A is the surface application layer; The raw materials for preparing layer A include polyester particles and anti-skid inorganic particles, and the raw materials for preparing layer B are polyester particles; Wherein, the anti-slip inorganic particles are selected from at least one of silicon dioxide, calcium carbonate and barium sulfate.

10. The production process of the low-fog and low-roughness anti-skid film according to claim 6, characterized in that: Step S1 is specifically as follows: S1-1, using polyester particles and anti-skid inorganic particles with a particle size of 0.2 to 1.5 nm as the raw materials for layer A, the added concentration of the anti-skid inorganic particles is 600 to 1500 ppm; using polyester particles as the raw material for layer B; S1-2, melt extrusion: the raw materials of layer A and layer B are melt extruded through their respective extruders to form an ABA three-layer structure at an extrusion temperature of 275-285°C; S1-3, sheet casting: the product obtained in step S1-2 is cast into sheets on a cold drum, the cold drum temperature is 20-30°C; S1-4, longitudinal stretching: preheat the cast sheet obtained in step S1-3 at 62-80°C, then longitudinally stretch it at 75-82°C with a stretching ratio of 1.8-3.5, and then cool it at 20-30°C to obtain a longitudinally stretched sheet; S1-5, transverse stretching: preheat the longitudinally stretched sheet at 95-112°C, then transversely stretch it at 110-230°C with a stretching ratio of 3-4.5, and then cool it at 120-50°C. The transverse shrinkage rate of the film in the cooling zone is 1%-3%, and finally a film substrate is obtained.

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