WO2022241966A1 - Production process for lining paper for packaging - Google Patents

Abstract

Disclosed is a production process for lining paper for packaging, comprising the following steps: carrying out mold pressing and aluminum plating on a PET base film to prepare a transfer film, compounding the transfer film with the front surface of a piece of paper, stripping the PET base film to prepare a piece of silver-white transfer bottom paper, coating the back surface of the silver-white transfer bottom paper to prepare a ceramic-like layer, carrying out hot stamping on the front surface of the silver-white transfer bottom paper by using alumite, and after hot stamping, carrying out embossing by using a micro-carving embossing plate to prepare the finished product, and finally cutting same according to the designed size and style. In the production process for the lining paper, the silver white bottom paper with a 360° full-view silver white appearance effect is prepared by using a customized mold pressing file, and three-dimensional images and text are printed by using a micro-carving embossing technology, such that the visual effect is improved.

Description

A production process of inner lining paper for packaging technical field

The invention relates to the technical field of packaging, in particular to a production process of inner lining paper for packaging.

Background technique

At present, the transfer bottom paper used in packaging materials on the market is produced by first coating the transfer coating and then vacuum aluminum plating. The transfer backing paper produced by this process has good metallic luster, which improves the aesthetics of packaging materials. However, this kind of transfer backing paper has disadvantages, that is, under different viewing angles, the paper surface will appear black; this phenomenon greatly affects the aesthetics of the transfer backing paper and subsequent printing effects.

In addition, the traditional hot stamping technology mainly uses engraving technology or corrosion to make hot stamping plates based on the hot stamping pattern, and then transfers the pattern to the substrate under certain process conditions. This technology can only hot stamp flat patterns, which is too Monotonous, poor visual effects for the public, difficult to deepen the public's impression, poor market competitiveness.

Contents of the invention

In order to solve the above existing problems, the present invention proposes a production process of the inner liner paper for packaging. In the production process of the inner liner paper, a silver-white base paper with a 360° full-view silver-white appearance effect is made from a customized molded file. And through micro-engraving embossing technology to print three-dimensional graphics to enhance the visual effect.

In order to achieve the above object, the present invention adopts the following solutions, including:

A production process for packaging lining paper, comprising the following steps:

(1) The PET base film is molded and aluminum-plated to make a transfer film, and the PET base film is molded with a customized molding file, and then aluminum-plated under vacuum conditions to make a transfer film;

(2) The transfer film is compounded with the paper front of the base paper, and the base paper and the transfer film are compounded on the compound machine, wherein the base paper is the lining base paper;

(3) The PET base film is peeled off to make a silver-white transfer backing paper, and the transfer film and the base paper are combined and placed in the curing room for processing, and then the PET base film is peeled off on a peeling machine to make a silver-white transfer backing paper;

(4) The silver-white transfer bottom paper is coated on the back to make a porcelain-like layer, and the silver-white transfer bottom paper is coated with a coating machine to form a coating film, and then the coating film is dried to form a porcelain-like layer;

(5) Hot stamping with anodized aluminum on the front of the silver-white transfer backing paper;

(6) After hot stamping, the finished product is embossed with a micro-engraving embossing plate, and finally cut according to the designed size and style.

Further, in the step (1): the molded file is a component formed by directly engraving optical images and texts with a micro-nano structure by using photolithography technology; when aluminizing, the wire feeding speed is 720±100mm/min, The unwinding tension of the film is 115±20N, and the winding tension is 45±15N.

Further, in the step (1): the molded file is an element carved out by laser lithography technology, and the laser engraved on the molded file has an optical pattern with a micro-nano structure; during aluminum plating, the wire feeding speed is 720±100mm/min, the unwinding tension of the film is 115±20N, and the winding tension is 45±15N.

Still further, the silver-white transfer backing paper has optical graphics with micro-nano structure, and the optical graphics on the silver-white transfer backing paper have both positive images and reverse images.

Further, in the step (2): during compounding, the machine speed of the compound machine is controlled at 110-130m/min, and the compound machine is equipped with four sets of ovens, and the temperature of the four sets of ovens is controlled at 65-100°C.

Further, in the step (3): the curing room is placed for 12-24 hours, the temperature of the curing room is controlled at 95°C±5°C; the peeling speed of the stripping machine is controlled at 100±10m/min.

Further, in the step (4): the porcelain-like layer is coated with porcelain-like ink or porcelain-like paint, and 2%-15% of zirconia is added to the porcelain-like ink or porcelain-like paint; when coating, The pressure of the coating roller is 0.5±0.1MPa, the machine speed of the coating machine is 90-95m/min, the viscosity of the coating is 13±2S, and the winding tension of the coated silver-white transfer backing paper is 0.2±0.05MPa. The amount of glue is 1.0-1.2g/m2; the coating film is dried in 4 temperature zones, the temperature of the 4 temperature zones is 100°C±10°C, 125°C±10°C, 130°C±10°C, 105°C ±10°C.

Further, in the step (5): during hot stamping, the hot stamping temperature is 160-170°C, the hardness of the rubber roller is 80-90A, the pressure is 0.6-0.8MPa, and the machine speed is 40-50m/min.

Further, in the step (6): the micro-engraving embossing plate is carved by laser direct engraving technology, and the graphics and blanks are controlled by data monitoring to control the precision and accuracy during engraving; when embossing, the machine speed is 110-120m/min, the unwinding tension is 15-20N, the winding tension is 250-280N, and the winding air pressure is 0.1-0.25kg/cm2.

Still further, the engraving lines of the micro-engraving embossing plate are 2-5 silk lines thick.

Still further, in the micro-engraving embossed plate, the plate roller is plated with chrome instead of nickel to increase smoothness, wear resistance and corrosion resistance.

Compared with the prior art, the present invention has the following beneficial effects:

1) In the production process of the inner liner paper of the present invention, when carrying out PET base film molding, adopt the custom-made molding file to make, the optical pattern of the micro-nano structure on the molding file also can be formed in PET base film, in After compounding and stripping with the original paper, the formed silver-white transfer backing paper will also form micro-nano structure optical graphics, and the optical graphics on the silver-white transfer backing paper have both positive and reverse images, so the silver-white transfer backing Both the front and the back of the paper are optical graphics with micro-nano structure, and the micro-nano structure is used to control the diffraction and propagation of light, so that the silver-white appearance of the silver-white transfer backing paper is not limited by the viewing angle, showing a 360° full-view silver-white Appearance effect, that is, to avoid the phenomenon of blackening of the paper surface due to angle changes;

2) In the production process of the lining paper of the present invention, the imitation porcelain layer is printed or coated on the back of the silver-white transfer base paper, so that the product has a brighter effect of glaze;

3) In the production process of the inner lining paper described in the present invention, the micro-carved embossing technology improves the hot stamping effect on the surface of the paper from a plane pattern to a three-dimensional pattern, which has a specific geometric shape, brings visual impact to consumption, and realizes the anti-counterfeiting performance of the product And high added value, enhance the market competitiveness of products.

Description of drawings

Fig. 1 is a flow chart of the production process of the inner liner paper according to the present invention.

Fig. 2 is a schematic cross-sectional view of the inner lining paper produced by the production process of the inner lining paper according to the present invention.

In the picture: 1-base paper; 2-glue layer; 3-aluminized layer; 4-imitation porcelain layer; 5-bronzing layer; 6-micro-engraving embossing.

Detailed ways

Embodiments of the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and therefore are only examples, rather than limiting the protection scope of the present invention.

It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application shall have the usual meanings understood by those skilled in the art to which the present invention belongs.

As shown in Figure 1, the following embodiments are carried out according to the production process of the inner lining paper shown in the figure.

Example 1

A production process of inner lining paper for packaging, which is carried out in the following steps:

(1) The PET base film is molded in a molding machine with a customized molding file, and then vacuum-plated on an aluminum-coating machine to make a transfer film. When aluminizing, the unwinding tension of the film is 115±20N, and the winding tension is 45 ±25N, the tension roller is 65±15N, and the wire feeding speed is 720mm/min;

(2) The transfer film and the front side of the paper are compounded with starch glue on a compound machine to make a silver-white transfer bottom paper. The machine speed is controlled at 110m/min, and the temperatures of the four sets of ovens are respectively set at 70°C±10°C, 80°C±10°C, 80℃±10℃ and 70℃±10℃;

(3) After the silver-white transfer base paper is made, place it in the curing room for 12-24 hours. The temperature of the curing room is controlled at 95°C±5°C, and then the PET base film is peeled off on a peeling machine, and the peeling speed is controlled at 110m/min;

(4) On the reverse side of the silver-white transfer backing paper, apply one layer of porcelain-like paint with zirconia powder as the bottom layer of the porcelain-like layer, and then apply another layer of porcelain-like paint as the upper layer of the porcelain-like layer to obtain the porcelain-like layer, and apply When laying, the pressure of the coating roller is 0.5±0.1MPa, the speed of the coating machine is 90m/min, the viscosity of the coating is 13±2S, and the winding tension of the coated silver-white transfer backing paper is 0.2±0.05MPa. The amount of dry glue is 1.0g/m ² , and the coating film is dried in 4 temperature zones, namely 100°C±10°C, 125°C±10°C, 130°C±10°C, 105°C±10°C;

(5) The front side of the silver-white transfer backing paper is hot-stamped with anodized aluminum. When hot-stamping, the hot-stamping temperature is 160°C, the hardness of the rubber roller is 80A, the pressure is 0.6MPa, and the machine speed is 40m/min.

(6) After hot stamping, emboss with micro-engraving embossing plate to make finished products. When embossing, the machine speed is 110m/min, the unwinding tension is 15N, the winding tension is 250N, and the winding air pressure is 0.1-0.25kg/cm ^2. Finally, cut according to the designed size and style.

Example 2:

A production process of inner lining paper for packaging, which is carried out in the following steps:

(1) The PET base film is molded in a molding machine with a customized molding file, and then vacuum-plated on an aluminum-coating machine to make a transfer film. When aluminizing, the unwinding tension of the film is 115±20N, and the winding tension is 45 ±25N, the tension roller is 65±15N, and the wire feeding speed is 715mm/min;

(2) The transfer film and the front side of the paper are compounded with starch glue on a compound machine to make a silver-white transfer bottom paper. The machine speed is controlled at 115m/min, and the temperatures of the four sets of ovens are set at 70°C±10°C, 80°C±10°C, 80℃±10℃ and 70℃±10℃;

(3) After the silver-white transfer backing paper is made, place it in the curing room for 12-24 hours. The temperature in the curing room is controlled at 95°C±5°C, and then the PET base film is peeled off on a peeling machine, and the peeling speed is controlled at 100m/min;

(4) On the reverse side of the silver-white transfer backing paper, apply one layer of porcelain-like paint with zirconia powder as the bottom layer of the porcelain-like layer, and then apply another layer of porcelain-like paint as the upper layer of the porcelain-like layer to obtain the porcelain-like layer, and apply When laying, the pressure of the coating roller is 0.5±0.1MPa, the speed of the coating machine is 95m/min, the viscosity of the coating is 13±2S, and the winding tension of the coated silver-white transfer backing paper is 0.2±0.05MPa. The amount of dry glue is 1.2g/m ² , and the coating film is dried in 4 temperature zones, respectively 100°C±10°C, 125°C±10°C, 130°C±10°C, 105°C±10°C;

(5) The front side of the silver-white transfer backing paper is hot-stamped with anodized aluminum. When hot-stamping, the hot-stamping temperature is 170°C, the hardness of the rubber roller is 90A, the pressure is 0.8MPa, and the machine speed is 50m/min.

(6) After hot stamping, the finished product is embossed with a micro-engraving embossing plate. When embossing, the machine speed is 120m/min, the unwinding tension is 18N, the winding tension is 260N, and the winding air pressure is 0.1-0.25kg/cm ^2. Finally, cut according to the designed size and style.

Can be made into lining paper as shown in Figure 2 through above-mentioned embodiment; In preparation process,

In the production process of the inner liner paper described in the present invention, when carrying out PET base film molding, adopt the customized molding file to make, the optical picture and text of the micro-nano structure on the molding file will also be formed in PET base film, after passing through and The compounding and stripping of the original paper will also form optical graphics with micro-nano structure on the silver-white transfer backing paper, and the optical graphics on the silver-white transfer backing paper have both positive and reverse images, so the silver-white transfer backing paper Both the front and the back are optical graphics with micro-nano structure, and the micro-nano structure is used to control the diffraction and propagation of light, so that the silver-white appearance of the silver-white transfer backing paper is not limited by the viewing angle, and presents a 360° full-view silver-white appearance , that is, to avoid the phenomenon of blackening of the paper surface due to angle changes;

In addition, printing or coating the porcelain-like layer on the back of the silver-white transfer base paper makes the product more glazed and bright; and adding 2%-15% zirconia to the porcelain-like paint for coating the porcelain-like layer, its effect It is to increase the porcelain white effect of the imitation porcelain layer.

In the final step (6), the micro-engraving embossing plate is engraved by laser direct engraving technology, and the graphics and blanks are controlled by data monitoring to control the precision and accuracy; the micro-engraving embossing technology makes the surface of the paper hot stamp The effect is upgraded from a flat pattern to a three-dimensional pattern, with a specific geometric shape, which brings a visual impact to consumers, realizes the anti-counterfeiting performance and high added value of the product, and enhances the market competitiveness of the product. Due to the use of customized molded documents in the previous steps, optical graphics with micro-nano structures are formed on the silver-white transfer backing paper that is subsequently prepared, and its silver-white appearance is not limited by the viewing angle, and the inner lining paper made The finished product still retains this kind of optical graphics with micro-nano structure, which also makes the three-dimensional pattern formed by the embossing of the micro-engraving embossing plate in step (6) not limited by the viewing angle, so that the three-dimensional pattern can be seen more clearly, and the display is better. three-dimensional effect. The engraving line of the micro-engraving embossing plate is 2-5 silk lines thick; the micro-engraving embossing plate has chrome plated on the plate roller instead of nickel to increase smoothness, wear resistance and corrosion resistance. The optical pattern of the micro-nano structure described in this implementation is periodic.

Claims (10)

A kind of production technology of lining paper for packaging, it is characterized in that, comprises the following steps: (1) The PET base film is molded and aluminum-plated to make a transfer film, and the PET base film is molded with a customized molding file, and then aluminum-plated under vacuum conditions to make a transfer film; (2) The transfer film is compounded with the paper front of the base paper, and the base paper and the transfer film are compounded on the compound machine, wherein the base paper is the lining base paper; (3) The PET base film is peeled off to make a silver-white transfer backing paper, and the transfer film and the base paper are combined and placed in the curing room for processing, and then the PET base film is peeled off on a peeling machine to make a silver-white transfer backing paper; (4) The silver-white transfer bottom paper is coated on the back to make a porcelain-like layer, and the silver-white transfer bottom paper is coated with a coating machine to form a coating film, and then the coating film is dried to form a porcelain-like layer; (5) Hot stamping with anodized aluminum on the front of the silver-white transfer backing paper; (6) After hot stamping, the finished product is embossed with a micro-engraving embossing plate, and finally cut according to the designed size and style. The production process for packaging inner liner paper according to claim 1, characterized in that, in the step (1): the molded file is an element carved out by laser lithography technology, and the molded file is laser engraved Optical graphics with micro-nano structure; when aluminized, the wire feeding speed is 720±100mm/min, the unwinding tension of the film is 115±20N, and the winding tension is 45±15N. According to the production process of packaging inner liner paper according to claim 2, it is characterized in that: the molded silver-white transfer backing paper has optical patterns of micro-nano structure, and the optical pattern on the silver-white transfer backing paper Text has both forward and reverse images. The production process of the inner lining paper for packaging according to claim 1, characterized in that, in the step (2): when compounding, the machine speed of the compounding machine is controlled at 110-130m/min, and the compounding machine is provided with four groups Oven, the temperature of the four groups of ovens is controlled at 65-100°C. The production process of the inner liner paper for packaging according to claim 1, characterized in that, in the step (3): the storage time of the curing chamber is 12-24 hours, and the temperature of the curing chamber is controlled at 95°C±5°C; The stripping speed of the stripping machine is controlled at 100±10m/min. The production process of lining paper for packaging according to claim 1, characterized in that, in the step (4): the imitation porcelain layer is coated with imitation porcelain ink or imitation porcelain paint, and the imitation porcelain ink or imitation porcelain Add 2%-15% zirconia to the porcelain paint; when coating, the pressure of the coating roller is 0.5±0.1MPa, the speed of the coating machine is 90-95m/min, the viscosity of the paint is 13±2S, and the coating The winding tension of the silver-white transfer backing paper is 0.2±0.05MPa, and the coating dry glue amount is 1.0-1.2g/m ² ; the coating film is dried in 4 temperature zones, and the temperature of the 4 temperature zones is 100°C ±10°C, 125°C±10°C, 130°C±10°C, 105°C±10°C. The production process of the inner lining paper for packaging according to claim 1, characterized in that in the step (5): when hot stamping, the hot stamping temperature is 160-170°C, the hardness of the rubber roller is 80-90A, and the pressure 0.6-0.8MPa, machine speed 40-50m/min. According to the production process of packaging inner liner paper according to claim 1, it is characterized in that in the step (6): the micro-engraved embossed plate is carved by laser direct engraving technology, and the pictures and texts are mixed with blanks when engraving Using data monitoring to control precision and accuracy; when embossing, the machine speed is 110-120m/min, the unwinding tension is 15-20N, the winding tension is 250-280N, and the winding air pressure is 0.1-0.25kg/cm ² . The production process of the inner liner paper for packaging according to claim 8, characterized in that: the engraving line of the micro-engraving embossed plate is 2-5 silk thick. The production process of packaging inner lining paper according to claim 9, characterized in that: the micro-engraved embossed plate is plated with chrome instead of nickel on the plate roll to increase smoothness, wear resistance and corrosion resistance.

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