CN215849785U - Pearl-lustre polyester film and manufacturing equipment thereof - Google Patents
Pearl-lustre polyester film and manufacturing equipment thereof Download PDFInfo
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- CN215849785U CN215849785U CN202122090264.9U CN202122090264U CN215849785U CN 215849785 U CN215849785 U CN 215849785U CN 202122090264 U CN202122090264 U CN 202122090264U CN 215849785 U CN215849785 U CN 215849785U
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Abstract
The application discloses manufacturing equipment of a pearlescent polyester film, which comprises a mixing bin, a feeding machine, a double-screw extruder, a longitudinal stretching mechanism, a transverse stretching mechanism and a film winding mechanism, wherein an online coating mechanism is arranged between the longitudinal stretching mechanism and the transverse stretching mechanism; the in-line coating mechanism comprises at least one pair of coating rollers for coating the two sides of the stretching sheet formed by the longitudinal stretching mechanism to form in-line coating. In addition, the application also discloses a pearlescent polyester film prepared by the manufacturing equipment. The manufacturing equipment can form the on-line coatings on the two sides of the base film of the pearlescent polyester film, so that the strength and uniformity of the stretch film forming are improved, and the surface quality of a finished product is improved.
Description
Technical Field
The application relates to a polyester film which can be used in the field of packaging, in particular to a pearly-luster polyester film and manufacturing equipment thereof.
Background
The pearlescent film is generally produced by mixing a polypropylene resin as a raw material with calcium carbonate, a pearlescent pigment and the like, and biaxially stretching the mixture. Because of the mechanical foaming method, the specific gravity of the pearlized film is only about 0.7, while the specific gravity of the polypropylene is about 0.9, so that flexible packaging enterprises are willing to choose the pearlized film, and the pearlized film is low in price, good in decoration and excellent in performance. Because of its pearlescent effect, pearlescent films are commonly used in decorative packaging materials for products, such as outer packaging for ice cream, heat-seal labels, confections, cookies, savory snacks, etc., and in gift packaging, etc. For example, CN1564841A discloses a stretched polymer film with voids, which introduces the related principles and examples of obtaining a low-density film material by stretching polypropylene resin mixed with calcium carbonate and the like. With the development of the packaging industry, the pearlized film gradually develops to high-end, and the trend of developing the pearlized polyester film by taking polyester as a raw material appears, so that higher requirements are provided for related materials such as printing ink, films and composite adhesives.
Disclosure of Invention
The technical problem to be solved by the present application is to provide a pearlescent polyester film and a manufacturing apparatus thereof to reduce or avoid the aforementioned problems.
In order to solve the technical problem, the application provides manufacturing equipment of a pearlescent polyester film, which comprises a mixing bin, a feeding machine, a double-screw extruder, a longitudinal stretching mechanism, a transverse stretching mechanism and a film winding mechanism, wherein an online coating mechanism is arranged between the longitudinal stretching mechanism and the transverse stretching mechanism; the in-line coating mechanism comprises at least one pair of coating rollers for coating the two sides of the stretching sheet formed by the longitudinal stretching mechanism to form in-line coating.
Preferably, the in-line coating mechanism further includes a common liquid bath for supplying the bottom coating liquid to the pair of coating rollers through the pipes.
Preferably, the manufacturing apparatus further comprises a protective film covering mechanism for covering a protective film on the surface of the manufactured pearlescent polyester film.
Preferably, the protective film covering mechanism further comprises a pair of protective film pressing rollers for covering protective films on the two side surfaces of the surface of the pearlescent polyester film and protective film material rollers for respectively conveying the protective films to the pair of protective film pressing rollers.
Preferably, the manufacturing apparatus further comprises a take-up roll for winding up the pearlescent polyester film covered with the protective film.
The application also provides the pearlescent polyester film prepared by the manufacturing equipment, which comprises a pearlescent polyester base film, wherein two sides of the pearlescent polyester base film are respectively provided with one layer of online coating, the thickness of the pearlescent polyester base film is 10-200 mu m, and the thickness of the online coating is 0.1-1 mu m.
The manufacturing equipment can form the on-line coatings on the two sides of the base film of the pearlescent polyester film, so that the strength and uniformity of the stretch film forming are improved, and the surface quality of a finished product is improved. The pearly-luster polyester film is prepared by taking PET as a raw material, adding pearly-luster master batch, mixing and then carrying out biaxial tension. Because of adopting the mechanical foaming method, the specific gravity of the film is reduced and can reach about 0.8 at least, and the film used as a soft packing material has low price, good decoration and excellent performance.
Drawings
The drawings are only for purposes of illustrating and explaining the present application and are not to be construed as limiting the scope of the present application.
Fig. 1 shows a schematic cross-sectional structure of a pearlescent polyester film of the present application.
Fig. 2 is a schematic structural view showing an apparatus for manufacturing a pearlescent polyester film according to an embodiment of the present application.
Fig. 3 shows a schematic cross-sectional structure of another pearlescent polyester film of the present application.
Detailed Description
Detailed description of the drawings specific embodiments of the present application will now be described in detail for a more clear understanding of the technical features, objects and effects of the present application.
As mentioned in the background art, the existing pearlized film is generally prepared from polypropylene, and polyester such as PET is used instead to prepare the pearlized film, and the material needs to be adjusted accordingly. Of course, polypropylene has a much lower thermal processing temperature than polyester, resulting in a polyester film stretched at high temperatures where the voids formed are difficult to control and the surface integrity is not good enough.
In one embodiment of the present application, the pearlescent polyester film of the present application is made of PET chips and 1.0 wt% to 5.0 wt% of pearlescent master batch of total mass, the pearlescent master batch comprises PET chips, incompatible particulate matter, pearlescent pigment, polydimethylsiloxane, silicon dioxide, ethyl orthosilicate. The incompatible particles can be any particles incompatible with polyester, including but not limited to inorganic calcium carbonate and the like, and high melting point polymers incompatible with PET, such as polyolefin and the like. The pearlescent pigment can also be any pearlescent pigment available in the art, such as mica-based pearlescent pigments and the like.
Specifically, the mass ratio of each component of the pearlescent master batch is as follows: incompatible particulate matter: pearlescent pigment: polydimethylsiloxane: nano silicon dioxide: ethyl orthosilicate is 100: (5-10): (3-6): (12-15): (1-5): (5-8). The particle size of the incompatible particulate material therein can be obtained experimentally depending on the properties of the material, and for example, a particle size of 3 to 6 μm can be preferable.
The preparation of the pearlescent masterbatch herein comprises the steps of:
at normal temperature, adding each component of the pearlescent master batch into a high-speed mixer for pre-dispersion mixing at the rotating speed of 1000-1500 rpm for 15-30 minutes to form a mixture;
the twin-screw extruder was brought to the set temperature interval according to the following table:
and (3) after heat preservation is carried out for 2 hours, adding the mixture into a double-screw extruder through a feeder, carrying out melt extrusion, and then carrying out water-cooling granulation to obtain the pearlescent master batch.
The following further describes the method for producing the pearlescent polyester film of this example. The preparation method of the pearlescent polyester film comprises the following steps:
respectively metering PET slices and pearlescent master batch accounting for 1.0-5.0 wt% of the total mass by an electronic scale, mixing in a mixing bin, respectively putting into a double-screw extruder, adjusting the temperature of the double-screw extruder to 270-280 ℃, melting, filtering, and extruding into thick sheets.
Preheating the thick sheet at the temperature of 50-90 ℃, entering an infrared heating zone at the temperature of 300-500 ℃, and longitudinally stretching at the linear speed of 40-150 m/min, wherein the longitudinal stretching ratio is 3.0-4.5, so as to obtain the stretched sheet.
Preheating the stretching sheet at the temperature of 90-120 ℃, and transversely stretching at the temperature of 100-160 ℃, wherein the transverse stretching ratio is 3.0-4.5.
Then shaping at 160-240 ℃, cooling at 100-50 ℃, shaping, cooling and rolling to obtain the pearlescent polyester film.
Since the polyester film of the present application must contain incompatible particles to prepare a low density film material with voids, the raw material selection requires that the dispersibility of the particles is sufficiently good, and the stability during the process of stretching from a thick sheet into a film is also a particular concern. Although polyester has a higher strength than polypropylene, slight disturbances present the problem of pore penetration through surface cracking due to the influence of particles during stretching. As a stretching production line of a common polyester film, special adjustment for the production of the pearlized film is impossible, so that even though the material composition is specially optimized, the surface integrity of the pearlized polyester film produced still has some defects.
The following product parameters obtained by testing the specific raw material ratios (parts by weight) are shown in the following table.
The parameters obtained by testing can be seen that the basic performance of the pearlescent polyester film still meets the requirements, and the only problems are that the surface shrinkage number is large, and the flatness cannot reach the perfect degree. Through measurement, the shrinkage cavities are not through holes, and the normal use of the shrinkage cavities as packing materials is not influenced.
Generally speaking, the pearly-lustre polyester film is prepared by taking PET as a raw material, adding pearly-lustre master batch, mixing and then carrying out biaxial stretching. Because of adopting the mechanical foaming method, the specific gravity of the film is reduced and can reach about 0.8 at least, and the film used as a soft packing material has low price, good decoration and excellent performance.
Further, in order to avoid affecting the appearance and sales, the present application provides an improved pearlescent polyester film, which comprises a pearlescent polyester base film 1, wherein both sides of the pearlescent polyester base film 1 are respectively provided with an online coating layer 2. As shown in fig. 1.
Specifically, the pearlescent polyester base film 1 of the present embodiment is the pearlescent polyester film described in the foregoing embodiments, and more specifically, the pearlescent polyester base film 1 is made of a PET chip and a pearlescent masterbatch of which the total mass is 1.0 wt% to 5.0 wt%, where the pearlescent masterbatch includes a PET chip, incompatible particulate matter, pearlescent pigment, polydimethylsiloxane, silicon dioxide, and ethyl orthosilicate. Similarly, the mass ratio of each component of the pearlescent master batch is as follows: incompatible particulate matter: pearlescent pigment: polydimethylsiloxane: silicon dioxide: ethyl orthosilicate is 100: (5-10): (3-6): (12-15): (1-5): (5-8). The particle size of the incompatible particulate material therein may preferably be 3-6 microns.
The online coating layer 2 is a layer of structure formed on the surface of the pearlescent polyester base film 1 by means of online coating. The on-line coating is a process of directly coating chemicals on the film by an on-line coating machine on a production line of the film so as to enhance and improve the surface function and the special physical and chemical indexes of the film and meet the use requirements of special products. Corresponding to the in-line coating is an off-line coating in which the film is produced and then coated. The online coating is different from the offline coating, and has the biggest characteristics of no need of rewinding, thin and uniform coating, high speed, high efficiency and low cost. Compared with the off-line coating technology, the on-line coating has the quality basically the same as that of off-line coating, but the cost is greatly reduced. In the present application, the primer solution constituting the on-line coating 2 is coated on the base film slab before or during the stretching of the base film 1, and then the base film slab is stretched into a film with a desired thickness, and the primer solution coated on the surface of the base film slab is cured together with the stretching to be thinner through high temperature in the stretching process to form the on-line coating 2. In this process, the coating thickness of the primer liquid is much reduced after the biaxial stretching.
In the application, the bottom coating liquid forming the online coating 2 forms huge surface tension towards the middle in the film forming process along with the stretching of the pearlescent polyester base film 1, and the components with good wettability and compressibility in the bottom coating liquid can be just filled into the surface shrinkage cavity of the pearlescent polyester base film 1, so that the strength and uniformity of the tensile film forming are improved, and the surface quality of the finished product is improved.
In one embodiment, the in-line coating 2 is formed by curing an acrylic adhesive, polyethyleneimine, ethyl acrylate, polyethylene oxide, melamine, and ethylene-vinyl acetate copolymer by in-line coating. Specifically, the mass ratio of each component of the on-line coating 2 is, respectively, acrylic acid adhesive: polyethyleneimine: ethyl acrylate: polyethylene oxide: melamine: the ethylene-vinyl acetate copolymer is 100: (3-5): 100: (10-15): (5-10): (10-15).
Wherein, the acrylic adhesive can be SAA1451 acrylic adhesive produced by Sichuan space Sanwa chemical company Limited, and the solid content is 40-45% by mass. The ethylene-vinyl acetate copolymer may be an ethylene-vinyl acetate copolymer available from Mitsui corporation of Japan and having a trade name of Evaflex 550, wherein the vinyl acetate polymer is contained in an amount of 14% by mass.
In another embodiment of the present application, the thickness of the pearlescent polyester base film 1 is 10 to 200 μm, and the thickness of the on-line coating layer 2 is preferably 0.1 to 1 μm.
The method for manufacturing the pearlescent polyester film of the present application is further described with reference to fig. 2, wherein fig. 2 is a schematic structural view of a manufacturing apparatus of the pearlescent polyester film according to an embodiment of the present application.
As shown in the figure, the manufacturing apparatus of the pearlescent polyester film of the present application sequentially comprises a mixing bin 100, a feeding machine 201, a twin-screw extruder 202, a longitudinal stretching mechanism 203, a transverse stretching mechanism 204 and a film winding mechanism 205 according to a film stretching process flow. Wherein, the above parts of the manufacturing equipment of the application can adopt the existing parts in the prior art.
In one embodiment of the present application, an in-line coating mechanism 300 is disposed between the longitudinal stretching mechanism 203 and the transverse stretching mechanism 204. The inline coating mechanism 300 includes at least one pair of coating rollers 301 for coating the drawn sheet formed by the longitudinal drawing mechanism 203 on both sides to form an inline coating. The inline coating mechanism 300 further includes a common liquid bath 303 for supplying the substrate liquid to the pair of coating rollers 301 through the pipes. The person skilled in the art can also apply the liquid to the surface of the film by other known application means than an application roller, based on the prior art. Of course, the manufacturing equipment is not limited to coating the specific on-line coating liquid disclosed in the application, and can also be used for coating any one of the coating liquids on the surface of the stretch sheet to prepare the pearlescent polyester film with any other desired functions.
The pearlescent polyester film obtained in the steps can be directly conveyed to a production line for producing products such as packaging bags and the like. Of course, in most cases, the pearlescent polyester film produced will need to be wound up for packaging for shipment and sale. Therefore, after the pearlescent polyester film is prepared, a protective film, such as release paper, can be coated on the surface of the on-line coating. Thus, as shown in fig. 2, the manufacturing apparatus of the present application may further include a protective film covering mechanism 500 for covering a surface of the manufactured pearlescent polyester film with a protective film, wherein the protective film covering mechanism 500 further includes a pair of protective film press rollers 501 for covering the surfaces of the pearlescent polyester film with the protective films on both sides of the surface of the pearlescent polyester film and protective film stock rollers 502 for respectively feeding the protective films to the pair of protective film press rollers 501.
In addition, the manufacturing equipment of the application can further comprise a material receiving roller 600 for winding the pearlescent polyester film covered with the protective film, and the pearlescent polyester film can be packaged for transportation and sale after being wound into a roller shape by the material receiving roller 600.
The manufacturing equipment can form the on-line coatings on the two sides of the base film of the pearlescent polyester film, so that the strength and uniformity of the stretch film forming are improved, and the surface quality of a finished product is improved.
Examples 4 to 6
Respectively metering PET slices and the pearlescent master batch by using the raw materials of the embodiments 1-3 through an electronic scale, mixing the PET slices and the pearlescent master batch in a mixing bin 100, adding the mixture into a double-screw extruder 202 through a feeder 201, adjusting the temperature of the double-screw extruder to 270-280 ℃, melting, filtering and extruding thick sheets.
Preheating the thick sheet at the temperature of 50-90 ℃, entering an infrared heating zone at the temperature of 300-500 ℃, and longitudinally stretching the thick sheet through a longitudinal stretching mechanism 203 at the linear speed of 40-150 m/min, wherein the longitudinal stretching ratio is 3.0-4.5, so as to obtain the stretched sheet.
The components of the on-line coating are respectively and uniformly mixed into the bottom coating liquid according to the weight ratio of the raw materials shown in the following table, the bottom coating liquid is transferred into the liquid tank 303 and preheated to 120 ℃, and then the bottom coating liquid is coated on the stretching sheet on line through the coating roller 301.
Preheating the stretching sheet at the temperature of 90-120 ℃, and transversely stretching the stretching sheet at the temperature of 100-160 ℃ by a transverse stretching mechanism 204, wherein the transverse stretching magnification is 3.0-4.5.
Then shaping is carried out at the temperature of 160-240 ℃, then cooling is carried out at the temperature of 100-50 ℃, shaping and cooling are carried out, and finally the pearly-luster polyester film is rolled by a film rolling mechanism 205 to obtain the pearly-luster polyester film.
The prepared pearlescent polyester film can be further covered with a protective film on the surface by a protective film covering mechanism 500, and finally is collected into a roll by a material collecting roller 600 for subsequent transportation, sale and the like.
The raw material components (parts by weight) and test parameters of the on-line coatings of the examples are shown in the following table.
Comparative examples 1 to 3
The raw material composition of the on-line coating of examples 4 to 6 was adjusted to obtain the following raw material ratios in parts by weight, and comparative examples 1 to 3 were obtained as shown in the following tables.
The surface shrinkage numbers,/m, of examples 4 to 6 and comparative examples 1 to 3 were measured2
Fig. 3 shows a schematic cross-sectional structure of another pearlescent polyester film of the present application. The pearlescent polyester film with the structure shown in fig. 3 is a typical three-layer structure, and is composed of an extrusion-molded layer a surface layer, a layer B core layer and a layer C bottom layer, wherein the layer a and the layer C are respectively arranged on two sides of the layer B and are made of PET, the layer B is the pearlescent polyester base film described in the foregoing embodiment, and the layer a and the layer C can be made of common PET.
Specifically, the layer B is prepared from PET slices and pearl master batch with the total mass of 1.0 wt% -5.0 wt%, wherein the pearl master batch comprises the PET slices, incompatible particulate matters, pearl pigment, polydimethylsiloxane, silicon dioxide and ethyl orthosilicate. Similarly, the mass ratio of each component of the pearlescent master batch is as follows: incompatible particulate matter: pearlescent pigment: polydimethylsiloxane: silicon dioxide: ethyl orthosilicate is 100: (5-10): (3-6): (12-15): (1-5): (5-8). The particle size of the incompatible particulate material therein may preferably be 3-6 microns.
The pearlescent polyester base film of the embodiment shown in fig. 3 can cover shrinkage cavities on the surface of the layer B due to the clamping of the layer a and the layer C, and therefore, an online coating is not needed. Of course, since the density of the general PET is relatively high, the effect of reducing the specific gravity by foaming the pearlescent polyester film with the three-layer structure is relatively poor, but the strength and the stiffness are better than those of the pearlescent polyester film of the previous embodiment.
Accordingly, the preparation method of the pearlescent polyester base film with a three-layer structure of the embodiment comprises the following steps:
and (3) metering PET slices by an electronic scale, mixing the PET slices in a mixing bin, and then respectively putting the PET slices into a first double-screw extruder and a third double-screw extruder.
Respectively metering PET and the pearlescent master batch accounting for 1.0-5.0 wt% of the total mass by an electronic scale, mixing in a mixing bin, and then feeding into a second single-screw extruder.
Adjusting the temperature of the first and third double-screw extruders to 270-280 ℃, and the temperature of the second single-screw extruder to 265-280 ℃; after melting, filtering, taking the materials extruded by the first and third double-screw extruders as the layer A and the layer C, taking the material extruded by the second single-screw extruder as the layer B, and preparing the three-layer composite thick sheet by a multilayer co-extrusion process.
Preheating the thick sheet at the temperature of 50-90 ℃, entering an infrared heating zone at the temperature of 300-500 ℃, and longitudinally stretching at the linear speed of 40-150 m/min, wherein the longitudinal stretching ratio is 3.0-4.5, so as to obtain the stretched sheet.
Preheating the stretching sheet at the temperature of 90-120 ℃, and transversely stretching at the temperature of 100-160 ℃, wherein the transverse stretching ratio is 3.0-4.5.
Then shaping at 160-240 ℃, cooling at 100-50 ℃, shaping, cooling and rolling to obtain the pearlescent polyester film.
It should be appreciated by those skilled in the art that while the present application is described in terms of several embodiments, not every embodiment includes only a single embodiment. The description is thus given for clearness of understanding only, and it is to be understood that all matters in the embodiments are to be interpreted as including all technical equivalents which are encompassed by the claims and are to be interpreted as combined with each other in a different embodiment so as to cover the scope of the present application.
The above description is only illustrative of the present invention and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of this application shall fall within the scope of this application.
Claims (6)
1. The manufacturing equipment of the pearlescent polyester film comprises a mixing bin, a feeding machine, a double-screw extruder, a longitudinal stretching mechanism, a transverse stretching mechanism and a film winding mechanism, and is characterized in that an online coating mechanism is arranged between the longitudinal stretching mechanism and the transverse stretching mechanism; the in-line coating mechanism comprises at least one pair of coating rollers for coating the two sides of the stretching sheet formed by the longitudinal stretching mechanism to form in-line coating.
2. The manufacturing apparatus as claimed in claim 1, wherein the in-line coating mechanism further has a common liquid bath that feeds the base coating liquid to the pair of coating rollers through pipes, respectively.
3. The manufacturing apparatus according to claim 2, further comprising a protective film covering mechanism for covering a surface of the obtained pearlescent polyester film with a protective film.
4. The manufacturing apparatus according to claim 3, wherein the protective film covering mechanism further comprises a pair of protective film press rollers for covering the protective film on both side surfaces of the surface of the pearl polyester film and protective film feed rollers for feeding the protective film to the pair of protective film press rollers, respectively.
5. The manufacturing apparatus according to claim 4, further comprising a take-up roll for winding up the pearlescent polyester film covered with the protective film.
6. A pearlescent polyester film produced by the production apparatus of any one of claims 1 to 5, comprising a pearlescent polyester base film having an on-line coating layer on each of both sides thereof, wherein the thickness of the pearlescent polyester base film is 10 to 200 μm and the thickness of the on-line coating layer is 0.1 to 1 μm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122090264.9U CN215849785U (en) | 2021-08-31 | 2021-08-31 | Pearl-lustre polyester film and manufacturing equipment thereof |
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| CN202122090264.9U CN215849785U (en) | 2021-08-31 | 2021-08-31 | Pearl-lustre polyester film and manufacturing equipment thereof |
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