Preparation method of paper-like fingerprint-resistant film, film and packaging bag

Abstract

The application provides a preparation method of a paper-texture anti-fingerprint film, the film and a packaging bag. The preparation method comprises the following steps: printing a texture layer on the inner side of a base film by intaglio printing process; printing an anti-fouling layer on the surface side of the base film by surface printing process; and compounding a heat sealing layer on the texture layer; and obtaining the paper-texture anti-fingerprint film through a maturation process. The texture layer is printed on the inner side of the base film by intaglio printing process by using a plate roller with fiber texture in the engraved area, and then the anti-fouling layer composed of a high-molecular touch oil is printed on the surface side of the base film. Finally, the heat sealing layer is compounded on the texture layer. The user will not directly contact the paper-texture layer, the physical properties of the paper-texture layer are stable, the fiber texture is directly engraved by the plate roller, the anti-fouling layer on the surface side plays the anti-fouling and anti-fingerprint roles, and the appearance is not affected. Moreover, the film can be directly used for loading food through the heat sealing layer, the use is convenient, the paper-texture effect is good.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of packaging film, and particularly relates to a preparation method of a paper-texture anti-fingerprint film, the film and a packaging bag. BACKGROUND

[0002] With the rapid development of social economy and the improvement of people's living standards, consumers are increasingly pursuing the concept of original ecology and environmental protection, and the paper fiber texture of packaging bags is very popular. Direct use of paper packaging bags can achieve the environmental protection demand of recyclable utilization, but the poor barrier property of paper packaging bags cannot prolong the shelf life of food. Moreover, the production of paper pulp not only consumes forest resources, but also leaves certain chemical substances in the paper, which is easy to cause food safety problems.

[0003] In the prior art, there is a technical solution of forming a paper-texture layer by coating a specific paper-texture coating on a base film. However, this method is complex in process and troublesome in preparation of the paper-texture coating. When the paper-texture layer faces the inner side, it cannot be applied to packaging food. When the paper-texture layer faces the outer side, it does not have the anti-fouling function. Therefore, there is an urgent need for a new paper-texture anti-fingerprint film technology that can achieve paper-texture, anti-fingerprint and anti-fouling effects at the same time and can be used in the field of food packaging. SUMMARY

[0004] The present application aims to overcome the deficiencies of the prior art and provide a preparation method of a paper-texture anti-fingerprint film, the film and a packaging bag, which solves the defects of complex preparation process, limited application and poor anti-fouling function of the paper-texture film in the prior art.

[0005] In a first aspect, the present application provides a preparation method of a paper-texture anti-fingerprint film, comprising the following steps:

[0006] On the inner side of the base film, a texture layer is gravure printed by inner printing process;

[0007] On the outer side of the base film, an anti-fouling layer is printed by outer printing process;

[0008] A heat-sealing layer is compounded on the texture layer;

[0009] After the maturation process, a paper-texture anti-fingerprint film is obtained.

[0010] In some embodiments, when the texture layer is gravure printed, it comprises:

[0011] A plate roller with fiber texture in the engraved area is used to gravure print a texture layer on the inner side of the base film;

[0012] The plate roller is configured to have a fiber texture engraving depth of 40 pm, and the fiber texture is made in the engraved area by a screen transition engraving method.

[0013] In some embodiments, when printing a texture layer on the inner side of the base film by using the inner printing process, the method comprises:

[0014] Printing a texture layer on the inner side of the base film by using ester-soluble polyurethane composite ink, and controlling the printing speed to be 200-250 m / min and the oven temperature to be 55℃±5 during the inner printing process.

[0015] In some embodiments, when printing a dirt-proof layer by using the outer printing process, the method comprises:

[0016] The dirt-proof layer is composed of high-molecular touch oil, which comprises 80-85% by weight of polyurethane resin emulsion, 5-15% by weight of fumed silica with a fineness of less than 25 um, and 3-10% by weight of additives, which comprise dispersing agents and wetting agents.

[0017] During the outer printing process, ethyl ester is used as the dilution solvent, and the printing speed is controlled to be 200-250 m / min to print a dirt-proof layer on the outer side of the base film.

[0018] In some embodiments, when a heat-sealing layer is compounded on the texture layer, the method comprises:

[0019] The base film is a PET film, and the heat-sealing layer is a PE or CPP film. New Hui Chemical XH9801A / B solvent-free composite adhesive is used to compound a heat-sealing layer on the side of the base film on which the texture layer is printed.

[0020] In some embodiments, during the aging process, the aging temperature is controlled to be 38℃, and the aging time is controlled to be 24 hours. The aging is performed until the cross-linking reaction of the high-molecular touch oil in the dirt-proof layer is completed, and then the aging is ended.

[0021] In a second aspect, the application provides a paper-texture-imitating and fingerprint-proof film prepared by the preparation method of the paper-texture-imitating and fingerprint-proof film according to any one of the preceding embodiments, which comprises a dirt-proof layer, a base film, a texture layer, and a heat-sealing layer.

[0022] The dirt-proof layer is composed of high-molecular touch oil.

[0023] The texture layer is composed of ester-soluble polyurethane composite ink.

[0024] The heat-sealing layer is compounded on the texture layer and is made of PE or CPP material.

[0025] The base film is made of PET material.

[0026] In some embodiments, the high-molecular touch oil comprises 80-85% by weight of a polyurethane resin emulsion, 5-15% by weight of fumed silica with a fineness less than 25 um, and 3-10% by weight of an auxiliary agent comprising a dispersing agent and a wetting agent.

[0027] In some embodiments, the texture layer is configured to be printed on the inner side of the base film by gravure printing using an ester-soluble polyurethane composite ink and a plate roller with a fiber texture engraving depth of 40 um.

[0028] In a third aspect, the application further provides a paper-texture anti-fingerprint packaging bag prepared from the paper-texture anti-fingerprint film according to any one of the preceding embodiments.

[0029] Compared with the prior art, the application has at least the following beneficial effects:

[0030] The paper-texture anti-fingerprint film prepared by the above components and process has a texture layer printed on the inner side of the base film by gravure printing using a plate roller with a fiber texture engraving area, an anti-fouling layer composed of a high-molecular touch oil printed on the surface side of the base film, and a heat-sealing layer compounded on the texture layer. The user does not directly contact the paper layer, the physical properties of the paper layer are stable, the fiber texture is directly engraved by the plate roller, the anti-fouling layer on the surface side plays a role in preventing dirt and fingerprints, does not affect the appearance, and can be directly used to load food through the heat-sealing layer, is convenient to use, and has good paper-texture effect. DETAILED DESCRIPTION

[0031] The technical solutions of the application will be described below in a clear and complete manner. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0032] In the description of the application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second", "third" are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present application, when it is described that a specific device is located between a first device and a second device, there can be or can not be an intervening device between the specific device and the first device or the second device. When it is described that a specific device is connected to another device, the specific device can be directly connected to the other device without an intervening device, or can not be directly connected to the other device with an intervening device.

[0034] Techniques, methods, and equipment known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered part of the specification where appropriate.

[0035] Applicants have found that:

[0036] In order to make the packaging bag have the texture of paper texture, in the prior art, there is a technical solution of coating a specific paper-imitating coating on a specific base film to form a paper texture, but this process is complex, and the paper-imitating layer formed by the paper-imitating coating generally has poor stability, cannot directly contact food from the inside, and cannot be normally used from the outside, has poor anti-fouling effect, in order to make up for the above two defects, compromises must be made in the process, or the anti-fouling property or safety of the paper-imitating coating is changed through complex raw material ratio, which indirectly increases the manufacturing cost and increases the process difficulty.

[0037] Therefore, in a first aspect, a preparation method of a paper texture anti-fingerprint film is provided in the present disclosure, comprising the following steps:

[0038] On the inner side of the base film, a texture layer is printed by intaglio printing process;

[0039] On the surface side of the base film, a anti-fouling layer is printed by surface printing process;

[0040] A heat sealing layer is compounded on the texture layer;

[0041] After the maturation process, a paper texture anti-fingerprint film is obtained.

[0042] Due to the use of intaglio printing, which is essentially a physical engraving press using a plate roll with fiber texture, a layer of texture layer is formed on the inner side of the base film by using ink, the focus is not on the matching of the ink, but on the use of a specific plate roll to physically press and print a fiber texture with a paper texture effect; then a layer of anti-fouling layer is printed on the surface side of the base film, the anti-fouling layer is separated from the texture layer by the base film, so the anti-fouling layer only has the effect of preventing dirt and avoiding leaving paper texture stains, etc., avoiding direct contact between the texture layer and the outside world, and the composition of the texture layer is simple and the performance state is stable, plus a layer of heat sealing layer is compounded on the side of the texture layer facing in, the heat sealing layer avoids direct contact between the texture layer and the contained object, preventing mutual influence between the texture layer and the contained object, and finally the imitation paper texture anti-fingerprint film is obtained after curing, the anti-fouling layer of the imitation paper texture anti-fingerprint film has a single anti-fouling function, directly facing the user, the base film provides basic film hardness, toughness and air tightness, and the texture layer uses intaglio printing to form a physical paper texture indentation, which is stable and has a layer of heat sealing layer compounded, ensuring safety.

[0043] Example 1

[0044] In this embodiment 1, when printing a layer of texture layer by intaglio printing, it includes:

[0045] A plate roll with fiber texture in the engraved area is used to print a layer of texture layer on the inner side of the base film by intaglio printing;

[0046] The plate roll has a fiber texture engraving depth of 40 μm, and the fiber texture is made in the engraved area by a screen transition engraving method. The 40 μm deep fiber texture formed by the screen transition engraving method can form a fiber indentation with appropriate depth on the surface of the base film without rebounding and can also hide oil.

[0047] Further, when printing a layer of texture layer by intaglio printing using the inner printing process, it includes:

[0048] A Shaanxi Beiren intaglio printing machine is used to print a layer of texture layer on the inner side of the base film by intaglio printing using ester-soluble polyurethane composite ink of Letong Ink. During the inner printing process, the printing speed is controlled at 200-250 m / min, and the oven temperature is 55℃±5.

[0049] The engraved area in the plate roll has a fiber texture with an engraving depth of 40 μm. The engraved area of the plate roll, together with the ester-soluble polyurethane composite ink, forms a layer of texture layer on the inner side of the base film. The ester-soluble polyurethane composite ink has stable properties and simple composition, and can be stored in the 40 μm engraved depth fiber texture for a long time, achieving a good and durable paper texture effect.

[0050] In this embodiment 1, when printing a layer of anti-fouling layer by intaglio printing using the surface printing process, it includes:

[0051] The anti-fouling layer is composed of a high-molecular touch oil, which includes 80-85% by weight of a polyurethane resin emulsion, 5-15% by weight of fumed silica with a fineness less than 25 um, and 3-10% by weight of an additive including a dispersing agent and a wetting agent. The polyurethane resin can cross-link with the fumed silica, and the fumed silica with a specific fineness can be uniformly dispersed in the polyurethane resin emulsion, thereby improving the mechanical properties and anti-fouling properties of the polyurethane resin. Preferably, the fumed silica with a fineness less than 25 um accounts for 6-12% by weight of the polyurethane resin emulsion, which can significantly improve the anti-fouling properties, and the effect is the best when the fumed silica accounts for 10% by weight of the polyurethane resin emulsion. If the amount of the fumed silica is less than 6% by weight of the polyurethane resin emulsion, the cross-linking reaction is insufficient, and if the amount of the fumed silica is more than 12% by weight of the polyurethane resin emulsion, the cross-linking reaction is excessive, thereby affecting the final properties.

[0052] In the surface printing process, ethyl acetate is used as a dilution solvent, the printing speed is controlled to be 200-250 m / min, and an anti-fouling layer is printed on the surface side of the base film.

[0053] In this embodiment 1, when a heat-sealing layer is compounded on the texture layer, the following steps are included:

[0054] The base film is a PET film, the heat-sealing layer is a PE or CPP film, and a new-hui chemical XH9801A / B solvent-free compounding adhesive is used to compound a heat-sealing layer on the side of the base film on which the texture layer is printed.

[0055] More specifically, a compounding device Nordmeccanica, model Super Simplex SL is used, a new-hui chemical XH9801A / B solvent-free compounding adhesive is used, a solvent-free compounding technology is used, the metering adhesive roller temperature is controlled to be 30-42℃, the adhesive roller temperature is controlled to be 35-45℃, the compounding temperature is controlled to be 40-50℃, the A adhesive tank temperature is controlled to be 35-38℃, the B adhesive tank temperature is controlled to be 35-38℃, the adhesive pipe temperature is controlled to be 40℃, the A / B adhesive ratio is controlled to be 100:50, and the coating amount is controlled to be 1.5-1.8 g / m 2 The properties of the XH9801A / B are shown in the following table:

[0056]

[0057]

[0058] Finally, in the curing process, the curing temperature is controlled to be 38℃, the curing time is controlled to be 24 hours, and the curing is performed until the cross-linking reaction of the high-molecular touch oil in the anti-fouling layer is completed, and then the curing is ended to achieve a good adhesion effect.

[0059] In a second aspect, the disclosure provides a paper-texture anti-fingerprint film prepared by the preparation method of the paper-texture anti-fingerprint film according to any one of the preceding embodiments, which includes an anti-fouling layer, a base film, a texture layer, and a heat-sealing layer.

[0060] The anti-fouling layer is covered on the surface side of the base film and is composed of a high-molecular touch oil;

[0061] The texture layer is covered on the inner side of the base film and is composed of an ester-soluble polyurethane composite ink;

[0062] The heat-sealing layer is compounded with the texture layer and is made of PE or CPP material;

[0063] The base film is made of PET material.

[0064] The high-molecular touch oil includes 80-85% by weight of polyurethane resin emulsion, 5-15% by weight of fumed silica with fineness less than 25 um, and 3-10% by weight of additives including dispersing agent and wetting agent. The polyurethane resin can cross-link with the fumed silica, and the fumed silica with specific fineness can be uniformly dispersed in the polyurethane resin emulsion to improve the mechanical properties and anti-fouling properties of the polyurethane resin. Preferably, the fumed silica with fineness less than 25 um accounts for 6-12% by weight of the polyurethane resin emulsion, which can significantly improve the anti-fouling properties, and the effect is the best when the fumed silica accounts for 10% by weight. If the amount of the fumed silica is less than 6% or more than 12%, the cross-linking reaction will be insufficient or excessive, which will affect the final performance.

[0065] The texture layer is configured to use ester-soluble polyurethane composite ink and is engraved on the inner side of the base film by gravure printing using a plate roller with a fiber texture engraving depth of 40 um. Since gravure printing is used, a plate roller with fiber texture is used to physically engrave and press, and a layer of texture layer is formed on the inner side of the base film by using ink. The focus is not on the adjustment of the ink, but on the use of a specific plate roller to physically press and print fiber texture with paper texture effect. The fiber texture with a depth of 40 um is formed in the engraved area of the plate roller by the screen transition engraving method, which can form fiber indentations with appropriate depth on the surface of the base film without rebounding and hiding oil.

[0066] In a third aspect, a paper-texture-imitating anti-fingerprint packaging bag is provided in the present disclosure and is prepared by using the paper-texture-imitating anti-fingerprint film according to any one of the preceding embodiments. Since the inner side of the paper-texture-imitating anti-fingerprint film is compounded with a heat-sealing layer, various styles of packaging bags can be prepared by cutting, heat-sealing, stamping and other processes of the film. The packaging bags can directly contain food and other contained objects and have the effect of imitating fiber texture. The surface layer has delicate and smooth touch and good texture. The anti-fouling layer can prevent fingerprints and prevent fouling. General dirt can be wiped off, and the packaging bag has good barrier property and can delay the shelf life of food.

[0067] Compared with the prior art, the application provides a preparation method of a paper-texture anti-fingerprint film, a film and a packaging bag. The paper-texture anti-fingerprint film prepared by the above components and processes is printed by a gravure roll with fiber texture in the engraved area on the inner side of the base film to form a texture layer, and then a dirt-proof layer composed of a high-molecular touch oil is printed on the surface side of the base film, and finally a heat-sealing layer is compounded on the texture layer. The user will not directly contact the paper layer, the physical properties of the paper layer are stable, the fiber texture is directly engraved by the gravure roll, the dirt-proof layer on the surface side plays a role in preventing dirt and fingerprints, and the appearance is not affected. Moreover, the film can be directly used for loading food through the heat-sealing layer, is convenient to use, and has good paper simulation effect.

[0068] Finally, it should be emphasized that the application is not limited to the above embodiments, and the above is only a preferred embodiment of the application and does not limit the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A method for preparing a paper-textured anti-fingerprint film, characterized in that, Includes the following steps: On the inside of the base film, a texture layer is printed using a reverse printing process. An antifouling layer is printed on the surface of the base film using a surface printing process. A heat-sealing layer is laminated onto the texture layer; After a curing process, a paper-textured anti-fingerprint film is obtained; When printing a texture layer using gravure printing, the following are included: Using a printing roller with a fibrous texture in the engraving area, a textured layer is gravure printed on the inside of the base film. The printing roller is configured to have a fiber texture engraving depth of 40μm, and the fiber texture is created in the engraving area using a screen-transition engraving method. When using gravure printing to print a texture layer, the process includes: Using ester-soluble polyurethane composite ink, a texture layer is gravure-printed on the inside of the base film. During the reverse printing process, the printing speed is controlled at 200~250m / min and the oven temperature is 55℃±5. When printing an anti-fouling layer using a surface printing process, the following are included: The antifouling layer is composed of a polymeric tactile oil, which includes 80-85% by weight of polyurethane resin emulsion, 5-15% by weight of fumed silica with a fineness of less than 25μm, and 3-10% by weight of additives, including dispersants and wetting agents. During the surface printing process, ethyl acetate is used as a diluent, and the printing speed is controlled at 200~250m / min to print an anti-fouling layer on the surface of the base film.

2. The method for preparing the paper-textured anti-fingerprint film as described in claim 1, characterized in that, When a heat-sealing layer is laminated onto a texture layer, the following steps are included: The base film is a PET film, and the heat-sealing layer is a PE or CPP film. A heat-sealing layer is laminated on the side of the base film with the printed texture layer using Xinhui Chemical XH9801A / B solvent-free composite adhesive.

3. The method for preparing the paper-textured anti-fingerprint film as described in claim 2, characterized in that, During the curing process, the curing temperature is controlled at 38℃ and the curing time is 24 hours. Curing continues until the cross-linking reaction of the polymer tactile oil in the antifouling layer is completed, and then the curing process ends.

4. A paper-textured anti-fingerprint film prepared by the method of preparing a paper-textured anti-fingerprint film according to any one of claims 1 to 3, characterized in that, Includes an antifouling layer, a base film, a textured layer, and a heat-sealing layer; The antifouling layer covers the surface of the base film and is composed of a high-molecular-weight tactile oil; The textured layer covers the inside of the base film and is composed of ester-soluble polyurethane composite ink; The heat-sealing layer is laminated onto the textured layer and is made of PE or CPP material; The base film is made of PET material.

5. The paper-textured anti-fingerprint film as described in claim 4, characterized in that, The polymeric tactile oil comprises 80-85% by weight of polyurethane resin emulsion, 5-15% by weight of fumed silica with a fineness of less than 25 μm, and 3-10% by weight of additives, including dispersants and wetting agents.

6. The paper-textured anti-fingerprint film as described in claim 5, characterized in that, The textured layer is configured to be gravure printed on the inside of the base film using an ester-soluble polyurethane composite ink and a printing roller with a fiber texture engraving depth of 40 μm.

7. A paper-textured fingerprint-resistant packaging bag, characterized in that, It is prepared using the paper-textured anti-fingerprint film as described in any one of claims 4 to 5.

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