Preparation system for low-matte polyester film

Abstract

The utility model discloses a preparation system for a low-matte polyester film. The low-matte polyester film is composed of a base material layer A, a surface matte layer B and a matte coating C, the preparation system can be used for efficiently and continuously preparing the low-matte polyester film and comprises a first mixer, a second mixer, a PET raw material tank, a silicon dioxide raw material tank and a polytetrafluoroethylene raw material tank, the first mixer is respectively connected with the PET raw material tank and the silicon dioxide raw material tank, and the second mixer is respectively connected with the PET raw material tank and the polytetrafluoroethylene raw material tank; the first mixer is connected with the main extruder, the second mixer is connected with the auxiliary extruder, the main extruder and the auxiliary extruder are connected with the thick sheet cooling mechanism, the thick sheet cooling mechanism is connected with the longitudinal stretching mechanism, and the longitudinal stretching mechanism is connected with the transverse stretching mechanism; a spraying mechanism and an ultraviolet irradiation mechanism are arranged at the downstream of the transverse stretching mechanism; a heat setting mechanism is arranged at the downstream of the ultraviolet irradiation mechanism, and a winding mechanism is arranged at the downstream of the heat setting mechanism.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of preparation systems for low-matt polyester film. BACKGROUND

[0002] Matt film has great demand in packaging, label, decoration, printing and other fields. Generally, the reflectivity of film surface below 10% is considered to be matt; the reflectivity between 10% and 30% is considered to be semi-matt; and the reflectivity above 30% is considered to be glossy. The degree of matt is generally represented by glossiness, which is usually between 0% and 100%. 0% represents complete dullness (e.g. matt surface), and 100% represents maximum glossiness (e.g. mirror surface). Glossiness is usually measured by a gloss meter. High-matt film generally refers to the surface glossiness below 10%, which has almost no gloss. Medium-matt film generally refers to the glossiness between 10% and 30%, which has certain gloss but still maintains relatively low reflectivity. Low-matt film has glossiness between 30% and 50%, which is relatively smooth and has obvious gloss but does not belong to high-gloss category.

[0003] For example, CN 103102474 B discloses a preparation method of matt polyester film: binary acid, binary alcohol and additive dispersion liquid are subjected to esterification reaction under the action of catalyst, and then stabilizer is added to perform polycondensation reaction to obtain matt film polyester. The additive in the additive dispersion liquid contains kaolin and barium sulfate. The 45-degree glossiness of the prepared polyester film is less than 30%.

[0004] The above-mentioned matt film of prior art forms scattering effect of light in the film layer by adding inorganic solid particles, reduces direct reflection of light of the same angle of incidence on the film layer to obtain certain matt effect. The solid particles scatter light and also hinder the projection of light, thereby reducing the light transmission performance of the film. At the same time, although the scattering effect of solid particles exists in the film layer, the influence on the surface of the film is limited, and the roughness of the film surface is difficult to effectively reduce, and the smooth surface is difficult to reduce light reflectivity. In addition, in order to obtain sufficient matt effect, the particle size of the added solid particles needs to reach a certain degree, and the addition amount also needs to be sufficient. The addition of too many large-diameter solid particles will form cavities in the interior of the matt layer during film stretching, which reduces the density and strength of the matt layer, thereby resulting in insufficient tear resistance of the outer matt layer and easy breakage and fragmentation, and the surface texture will quickly decrease due to the pores of the stretched film layer which are easily penetrated by colorants to present patches.

[0005] In addition, the prior art also lacks special equipment or system for preparing low-matt polyester film, and cannot efficiently and continuously prepare low-matt polyester film. SUMMARY

[0006] The technical problem to be solved by the utility model is to provide a preparation system for low-matt polyester film to reduce or avoid the problems mentioned above.

[0007] To solve the above technical problem, the utility model provides a preparation system for low-matt polyester film, the low-matt polyester film is composed of base material layer A, surface matt layer B and matt coating C sprayed on the outside of surface matt layer B, the preparation system includes first mixer corresponding to base material layer A and second mixer corresponding to surface matt layer B, the first mixer and the second mixer have a shared PET raw material tank; the inlet of the first mixer is connected with the PET raw material tank and a silicon dioxide raw material tank respectively, the inlet of the second mixer is connected with the PET raw material tank and a polytetrafluoroethylene raw material tank respectively; the outlet of the first mixer is connected with main extruder, the outlet of the second mixer is connected with auxiliary extruder, the outlet of main extruder and auxiliary extruder is connected with thick sheet cooling mechanism, the outlet of thick sheet cooling mechanism is connected with longitudinal stretching mechanism, the outlet of longitudinal stretching mechanism is connected with transverse stretching mechanism; the downstream of transverse stretching mechanism is provided with spraying mechanism and ultraviolet light irradiation mechanism; the downstream of ultraviolet light irradiation mechanism is provided with heat setting mechanism, and the downstream of heat setting mechanism is provided with winding mechanism.

[0008] Preferably, the inlet of the spraying mechanism is connected with a matt coating tank.

[0009] The low-matt polyester film of the utility model realizes the comprehensive optimization of optical performance, mechanical performance and durability through the accurate design of base material layer A, surface matt layer B and matt coating C, exhibits multiple advantages such as low gloss, high wear resistance, excellent adhesion and anti-aging performance, and is suitable for various fields such as high-end decoration, optical elements and functional coating. In addition, the utility model also proposes a special system for preparing low-matt polyester film, which can efficiently and continuously prepare low-matt polyester film. BRIEF DESCRIPTION OF DRAWINGS

[0010] The following drawings are only intended to illustrate and explain the application and do not limit the scope of the utility model.

[0011] Figure 1 The structure schematic diagram of low-matt polyester film according to one specific embodiment of the utility model is shown.

[0012] Figure 2 The structure schematic diagram of the preparation system for low-matt polyester film according to one specific embodiment of the utility model is shown. DETAILED DESCRIPTION

[0013] In order to have a clearer understanding of the technical features, objects and effects of the present application, the specific embodiments of the present application will be described with reference to the drawings. Identical components are denoted by identical reference numerals.

[0014] As shown in Figure 1 The present application provides a low-matte polyester film, which is composed of a base material layer A, a surface matte layer B and a matte coating C sprayed on the outer side of the surface matte layer B.

[0015] In one embodiment, the thickness of the base material layer A is 30-35 μm; the thickness of the surface matte layer B is 5-7 μm; and the thickness of the matte coating C is 1-5 μm. When the thickness of the matte coating C is preferably 1-3 μm, the matte effect of the film does not significantly affect the transparency of the film, and the film is suitable for applications requiring high light transmittance. When the thickness of the matte coating C is preferably 3-5 μm, the film is suitable for applications requiring low gloss, such as anti-glare applications.

[0016] The total thickness of the low-matte polyester film of the present application is preferably designed to be about 40-50 μm, so that the film can meet the mechanical strength while maintaining flexibility and light transmittance. The thickness of the matte coating C is 1-5 μm, which can ensure uniform distribution of the coating while maintaining low gloss and wear resistance, and will not significantly affect the mechanical properties of the base material.

[0017] In another embodiment, the base material layer A is composed of 89.5-90.5% by mass of polyethylene terephthalate (PET) and 9.5-10.5% by mass of silicon dioxide (SiO2) nanoparticles.

[0018] Further, the polyethylene terephthalate preferably uses optical grade PET particles or chips, preferably a raw material product with a melting point of about 255°C, such as high-purity optical grade PET provided by Toray, DuPont, etc., with a light transmittance of more than 90%.

[0019] In yet another embodiment, the surface matte layer B is composed of 96.5-98.5% by mass of polyethylene terephthalate (PET) and 1.5-3.5% by mass of polytetrafluoroethylene (PTFE).

[0020] Further, the polyethylene terephthalate preferably uses optical grade PET particles or chips, preferably a raw material product with a melting point of about 255°C, such as high-purity optical grade PET provided by Toray, DuPont, etc., with a light transmittance of more than 90%. The polytetrafluoroethylene preferably uses micropowder particles with a particle size of ≤1 μm, such as 3M's Dyneon TM PTFE or Solvay's PTFE series.

[0021] In yet another embodiment, the matte coating C is formed by UV curing of a coating material comprising the following raw materials in mass fraction: 69.5-70.5% of polyurethane acrylate (PUA), 9.5-10.5% of silicone silica microparticles, 16.0-17.5% of tripropyloxy triethylene glycol acrylate (TMPTA), 1.5-3.0% of benzophenone (BP), 0.5% of polyether siloxane, and 0.5% of polydimethylsiloxane.

[0022] Further specifically, the polyurethane acrylate (PUA) preferably uses a product with a viscosity range of 3000-5000 cps, such as the polyurethane acrylate resin provided by BASF, Mitsubishi Chemical, etc.; further preferably, a PUA suitable for UV curing coating, such as the Laromer series of Merck KGaA (Germany Merck). The silicone silica microparticles preferably use a product with a particle size of 3-5 μm, such as the Sipernat series of Degussa, or the Syloid series of Grace. The tripropyloxy triethylene glycol acrylate preferably uses a product with a purity of greater than or equal to 98%, such as the high-purity TMPTA supplied by Sigma-Aldrich or Allnex. The benzophenone preferably has a spectral range of about 365 nm, with a purity of ≥99%. For example, the UV curing series products of IGM Resins or BASF. Both the polyether siloxane and the polydimethylsiloxane can use the products of BYK Chemical Co., Ltd., such as the polyether siloxane can use BYK-333, and the polydimethylsiloxane can use BYK-016.

[0023] Further specifically, the coating material forming the matte coating C can be prepared by the following process. For example, the polyurethane acrylate and TMPTA are mixed in mass proportion and stirred at room temperature until completely dissolved to form a uniform solution. The silicone silica microparticles are added to the above solution and stirred for 10-15 minutes to ensure uniform dispersion. A high-speed stirring device (about 1000 rpm) is used for better effect. The benzophenone, polyether siloxane, and polydimethylsiloxane are added in proportion and slowly stirred for 5 minutes to completely dissolve the components. The solution is filtered through a 100-mesh screen to remove undispersed particles or impurities, ensuring the uniformity and transparency of the coating.

[0024] The matt coating of the utility model is added with silicone dioxide microparticles and forms a surface rough structure, so that the glossiness of the coating is significantly reduced, and low matt effect is achieved. The cross-linking structure of PUA matrix resin and TMPTA improves the hardness and wear resistance of the coating. The composite structure of silicone dioxide microparticles and PUA not only reduces the glossiness, but also has the function of resisting ultraviolet rays, prolonging the service life of the film. The design and process of the coating material help to form a uniform and stable matt layer on the surface, ensure low gloss effect, and at the same time enhance the durability of the film.

[0025] Further, the low-matt polyester film of the utility model can be prepared by the following process.

[0026] The raw materials constituting the substrate layer A and the surface matt layer B are weighed and put into respective mixers for melt blending, and the melt temperature is controlled at 250-270 DEG C.

[0027] The substrate layer A is melt extruded by a main extruder at 250-260 DEG C, and the cooling roller temperature is 20 DEG C. The surface matt layer B is melt extruded by an auxiliary extruder at a temperature of 260-270 DEG C, and the cooling roller temperature is 15 DEG C. The extruded two film layers are simultaneously introduced into a cooling system to form a double-layer thick sheet, and the cooling temperature of the thick sheet is set at 15-20 DEG C.

[0028] The double-layer thick sheet is longitudinally stretched by 3 times at 85-90 DEG C, and then transversely stretched by 3.5 times at a temperature of 110-120 DEG C.

[0029] The coating constituting the matt coating C is uniformly sprayed on the surface of the surface matt layer B, and the coating thickness is controlled at 5-10 mu m. Then, ultraviolet light initiation treatment is carried out, the wavelength of the ultraviolet light is 365 nm, the irradiation intensity is 300 mW / cm 2 , the time is controlled at 3 minutes, and the cooling is carried out to room temperature to form the matt coating C.

[0030] Finally, the film forming the matt coating is heat set at 200-210 DEG C, and the setting time is 5-10 seconds, so as to ensure the stability of the layered structure and enhance the dimensional stability and durability of the film.

[0031] Corresponding to the above preparation process, the utility model also proposes a preparation system for preparing the above low-matt polyester film, as shown in Figure 2 .

[0032] The preparation system comprises a first mixer 100 corresponding to a base material layer A and a second mixer 200 corresponding to a surface matte layer B, the first mixer 100 and the second mixer 200 have a shared PET raw material tank 10; the inlet of the first mixer 100 is connected with the PET raw material tank 10 and a silicon dioxide raw material tank 11 respectively, and the inlet of the second mixer 200 is connected with the PET raw material tank 10 and a polytetrafluoroethylene raw material tank 12 respectively. The shared PET raw material tank 10 can significantly reduce the number of equipment and the types of raw materials, and is beneficial to obtain a film layer with uniform quality.

[0033] The first mixer 100 corresponding to the base material layer A and the second mixer 200 corresponding to the surface matte layer B melt and blend the input raw materials; and then are extruded respectively.

[0034] Further, the outlet of the first mixer 100 is connected with a main extruder 101, the outlet of the second mixer 200 is connected with an auxiliary extruder 201, and the outlets of the main extruder 101 and the auxiliary extruder 201 are connected with a thick sheet cooling mechanism 300. The base material layer A is extruded by the main extruder 101, the surface matte layer B is extruded by the auxiliary extruder 201, and then enters the thick sheet cooling mechanism 300 for cooling, and the cooled thick sheet is sequentially subjected to longitudinal stretching and transverse stretching.

[0035] The outlet of the thick sheet cooling mechanism 300 is connected with a longitudinal stretching mechanism 400, the outlet of the longitudinal stretching mechanism 400 is connected with a transverse stretching mechanism 500, and a spraying mechanism 601 and an ultraviolet light irradiation mechanism 602 are arranged downstream of the transverse stretching mechanism 500.

[0036] The spraying mechanism 601 sprays matte paint on the surface of the surface matte layer B, and then the ultraviolet light irradiation mechanism 602 is used for irradiation treatment.

[0037] Further, the inlet of the spraying mechanism 601 can also be connected with a matte paint tank 600, so as to continuously supply the matte paint to the spraying mechanism 601 through the matte paint tank 600, so as to obtain the effect of continuous production with high quality.

[0038] A heat setting mechanism 701 is arranged downstream of the ultraviolet light irradiation mechanism 602, and a winding mechanism 700 is arranged downstream of the heat setting mechanism 701.

[0039] The polyester film prepared is subjected to performance test. The BYK or HunterLab gloss meter and haze meter are used to test the gloss, haze and light transmittance of the film. The Instron tensile testing machine is used to test the tensile strength and elongation at break according to the ASTM standard specification. The Q-SUN of Q-Lab or the UV test box of Atlas is used to test the ultraviolet aging performance for 500 hours.

[0040] The relevant performance parameter measurement standards are shown below.

[0041] The gloss test standard is measured by ASTM D523 using a 60° gloss meter. The haze test standard is measured by ASTM D1003 using a haze meter to test the scattering effect, anti-glare performance of the film. The light transmittance test standard is measured by ASTM D1003 using a light transmittance tester to test the light transmittance of the film under the matte effect. The tensile strength test standard is measured by ASTM D882 using a tensile tester, tested in the machine direction (MD) and transverse direction (TD) to test the durability of the film. The elongation at break test standard is measured by ASTM D882 to characterize the flexibility and durability of the film. The coefficient of friction (COF) test standard is measured by ASTM D1894 using a coefficient of friction tester to test the surface smoothness of the film. The surface hardness test standard is measured by ASTM D3363, pencil hardness test, to evaluate the scratch resistance of the coating, and to test the wear resistance of the film during use. The UV resistance standard is that after exposure to ultraviolet light for 500 hours, the light transmittance and gloss are maintained at least 90% or more, and the change rate is tested whether it exceeds 10%. The test standard is ASTM G154, ultraviolet aging test, to simulate the stability under long-term exposure. The chemical resistance standard is that it can resist wiping with common chemical solvents such as ethanol and isopropanol, and there is no obvious damage to the surface. The test standard is ASTM D5402, coating chemical resistance test, to test the stability of the surface matte layer. The matte coating adhesion test standard is ASTM D3359, using crosshatch method to test the adhesion of the coating to the substrate, to test the stability of the matte coating during use.

[0042] Example 1

[0043] The low-matte polyester film of this example is composed of a 30 μm thick substrate layer A, a 5 μm thick surface matte layer B, and a 1 μm thick matte coating layer C.

[0044] The substrate layer A contains 90.0% polyethylene terephthalate (PET), 10.0% silicon dioxide (SiO2); the surface matte layer B contains 97.0% PET, 3.0% polytetrafluoroethylene (PTFE); the matte coating layer C is composed of 70.0% polyurethane acrylate (PUA), 10.0% silicone silica microparticles, 16.5% tripropyloxy triethylene glycol acrylate (TMPTA), 2.5% benzophenone (BP), 0.5% polyether siloxane, and 0.5% polydimethylsiloxane.

[0045] The film of this example has a glossiness of 37%, a haze of 20%, a light transmittance of 90%, a tensile strength of 140 MPa, an elongation at break of 118%, a friction coefficient of 0.4, a surface hardness of 2H, a change in light transmittance and glossiness of 6% after ultraviolet light aging for 500 hours, and excellent resistance to common chemical solvents; the matte coating has an adhesion of 5B.

[0046] Example 2

[0047] The low-matte polyester film of this example is composed of a 33 μm-thick base layer A, a 6 μm-thick surface matte layer B, and a 3 μm-thick matte coating layer C.

[0048] The base layer A contains 89.5% PET and 10.5% SiO2; the surface matte layer B contains 96.5% PET and 3.5% PTFE; and the matte coating layer C contains 69.5% PUA, 10.5% silicone silica microparticles, 17.5% TMPTA, 1.5% BP, 0.5% polyether siloxane, and 0.5% polydimethylsiloxane.

[0049] The film of this example has a glossiness of 38%, a haze of 21%, a light transmittance of 89%, a tensile strength of 145 MPa, an elongation at break of 120%, a friction coefficient of 0.5, a surface hardness of 2H, a change in light transmittance and glossiness of 5% after ultraviolet light aging for 500 hours, and excellent resistance to common chemical solvents; the matte coating has an adhesion of 5B.

[0050] Example 3

[0051] The low-matte polyester film of this example is composed of a 35 μm-thick base layer A, a 7 μm-thick surface matte layer B, and a 5 μm-thick matte coating layer C.

[0052] The base layer A contains 90.5% PET and 9.5% SiO2; the surface matte layer B contains 98.5% PET and 1.5% PTFE; and the matte coating layer C contains 70.5% PUA, 9.5% silicone silica microparticles, 16.0% TMPTA, 3% BP, 0.5% polyether siloxane, and 0.5% polydimethylsiloxane.

[0053] The film of this example has a glossiness of 39%, a haze of 22%, a light transmittance of 92%, a tensile strength of 144 MPa, an elongation at break of 119%, a friction coefficient of 0.4, a surface hardness of H, a change in light transmittance and glossiness of 7% after ultraviolet light aging for 500 hours, and excellent resistance to common chemical solvents; the matte coating has an adhesion of 5B.

[0054] Comparative Example 1

[0055] The proportion of SiO2in the base layer A is reduced to 8% based on Example 1.

[0056] Impact: Reduced matte performance (glossiness increased), while possibly leading to decreased haze and slightly increased light transmission.

[0057] Comparative Example 2

[0058] Adjustment based on Example 1: No PTFE in surface matte layer B, only 100% PET used.

[0059] Impact: Reduced surface slipperiness, increased coefficient of friction, while glossiness is slightly high, not good for matte effect.

[0060] Comparative Example 3

[0061] Adjustment based on Example 1: Remove BP (photoinitiator) in matte coating C.

[0062] Impact: Significant decrease in UV curing efficiency, coating adhesion and durability become worse.

[0063] Comparative Example 4

[0064] Adjustment based on Example 2: Increase SiO2 proportion in substrate layer A to 12%.

[0065] Impact: Enhanced matte effect, reduced glossiness, but possibly leading to too high haze, affecting visual clarity.

[0066] Comparative Example 5

[0067] Adjustment based on Example 2: Replace PTFE in surface matte layer B with ultra-high molecular weight polyethylene (UHMWPE).

[0068] Impact: Enhanced surface wear resistance, but dispersion with PET matrix may become worse, affecting overall performance uniformity.

[0069] Comparative Example 6

[0070] Adjustment based on Example 2: Reduce silicone silica proportion in matte coating C to 8%.

[0071] Impact: Reduced surface matte performance, slightly weakened chemical resistance.

[0072] Comparative Example 7

[0073] Adjustment based on Example 3: Use ordinary industrial-grade PET in substrate layer A.

[0074] Impact: Overall mechanical performance decreases, especially tensile strength and elongation at break may be low.

[0075] Comparative Example 8

[0076] Adjustment based on Example 3: PTFE proportion in surface matte layer B reduced to 1%.

[0077] Impact: Friction coefficient increased, slipperiness decreased, and surface hardness may be affected.

[0078] Comparative Example 9

[0079] Adjustment based on Example 3: TMPTA proportion in matte coating C reduced to 10%.

[0080] Impact: Insufficient cross-linking density during curing, surface wear resistance decreased, and ultraviolet aging performance may be affected.

[0081] The comparative results of various properties are shown in the following table.

[0082]

[0083] According to the comparative results of Examples 1-3 and Comparative Examples 1-9, from the functional role of each component, it is shown that in substrate layer A, polyethylene terephthalate (PET) can provide good mechanical properties such as tensile strength and elongation at break. Silicon dioxide (SiO2) nanoparticles can improve optical performance, control gloss and haze, optimize the scattering effect of the film surface, and enhance the matte performance. When the SiO2 proportion is too low (such as Comparative Example 1), the matte performance decreases and the gloss increases; when the SiO2 proportion is too high (such as Comparative Example 4), the haze increases, the light transmittance decreases, and the visual clarity is affected. In surface matte layer B, PET as the base material can provide interlayer adhesion and mechanical stability. Polytetrafluoroethylene (PTFE) can provide surface slipperiness, reduce the friction coefficient, and improve wear resistance and surface hardness. Without PTFE (such as Comparative Examples 2 and 5), the surface slipperiness decreases significantly, the friction coefficient increases, and the durability and ease of use of the film are affected. In matte coating C, polyurethane acrylate (PUA) gives the coating good flexibility and mechanical stability, provides excellent adhesion and chemical resistance. Silicone silica particles can enhance the matte effect and the chemical corrosion resistance of the coating surface; tripropoxy triethylene glycol acrylate (TMPTA) can provide cross-linking density and improve coating hardness; benzophenone (BP) as a photoinitiator ensures the efficiency of ultraviolet curing; polyether siloxane and polydimethylsiloxane further optimize the surface smoothness and anti-sticking effect. Without BP (such as Comparative Example 3), the coating curing efficiency decreases, resulting in poor adhesion; when the proportion of silicone silica is not appropriate (such as Comparative Example 6), the matte performance and chemical resistance decrease; and when the TMPTA proportion is reduced (such as Comparative Example 9), the surface hardness and wear resistance are significantly weakened.

[0084] In summary, the low-matte polyester film has the following advantages: (1) excellent optical performance: the glossiness is maintained at a low level (38-40%), showing a soft visual effect; the haze and light transmittance are balanced, suitable for optical and decorative applications; (2) excellent mechanical performance: the film has high tensile strength (140-145 MPa) and moderate elongation at break (118-120%), meeting the use requirements of various scenes; (3) excellent surface properties: low friction coefficient (0.4-0.5), good surface smoothness, easy to process and use; surface hardness reaches 2H or H, excellent wear resistance; (4) reliable durability: after 500 hours of ultraviolet aging, the light transmittance and glossiness change little (<7%), showing excellent anti-aging performance; strong resistance to common chemical solvents, suitable for use in harsh environments; (5) stable matte coating adhesion: the coating adhesion reaches 5B, ensuring that the coating does not fall off during long-term use; (6) optimized component ratio: the components of each layer are precisely optimized to realize the synergistic effect between materials, ensuring the balance and efficiency of overall performance.

[0085] In summary, the low-matte polyester film of the present application realizes comprehensive optimization of optical performance, mechanical performance and durability through precise design of the substrate layer A, surface matte layer B and matte coating C, and exhibits multiple advantages such as low gloss, high wear resistance, excellent adhesion and anti-aging performance, etc., suitable for various fields such as high-end decoration, optical components and functional coatings. These advantages highlight the technical breakthrough brought by the interaction and fine control between components, fully embodying the innovation and practical value of the present application.

[0086] Those skilled in the art should understand that although the present application is described in the form of multiple embodiments, not every embodiment contains only one independent technical solution. The description in the specification is only for clarity, those skilled in the art should understand the specification as a whole and understand the technical solutions involved in each embodiment as a way to combine different embodiments to understand the protection scope of the present application.

[0087] The above is only a specific embodiment of the present application, and is not intended to limit the scope of the present application. Any equivalent changes, modifications and combinations made by those skilled in the art without departing from the concept and principles of the present application shall fall within the scope of protection of the present application.

Claims

1. A manufacturing system for a low-matt polyester film, the low-matt polyester film being composed of a base material layer A, a surface-matt layer B, and a matt coating layer C sprayed on the outside of the surface-matt layer B; the thickness of the base material layer A is 30-35 μm; the thickness of the surface-matt layer B is 5-7 μm; the thickness of the matt coating layer C is 1-5 μm; characterized in that, The preparation system comprises a first mixer (100) corresponding to the base material layer A and a second mixer (200) corresponding to the surface matte layer B, the first mixer (100) and the second mixer (200) have a shared PET raw material tank (10); the inlet of the first mixer (100) is connected with the PET raw material tank (10) and a silica raw material tank (11) respectively, the inlet of the second mixer (200) is connected with the PET raw material tank (10) and a polytetrafluoroethylene raw material tank (12) respectively; the outlet of the first mixer (100) is connected with a main extruder (101), the outlet of the second mixer (200) is connected with an auxiliary extruder (201), the outlets of the main extruder (101) and the auxiliary extruder (201) are connected with a thick sheet cooling mechanism (300), the outlet of the thick sheet cooling mechanism (300) is connected with a longitudinal stretching mechanism (400), the outlet of the longitudinal stretching mechanism (400) is connected with a transverse stretching mechanism (500); a spraying mechanism (601) and an ultraviolet light irradiation mechanism (602) are arranged downstream of the transverse stretching mechanism (500); a heat setting mechanism (701) is arranged downstream of the ultraviolet light irradiation mechanism (602), and a winding mechanism (700) is arranged downstream of the heat setting mechanism (701).

2. The preparation system of claim 1, wherein, The inlet of the spraying mechanism (601) is connected with a matte coating tank (600).

Images