CN113981709B - Manufacturing method of double-color leather with stereoscopic impression - Google Patents

Manufacturing method of double-color leather with stereoscopic impression Download PDF

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Publication number
CN113981709B
CN113981709B CN202111349400.XA CN202111349400A CN113981709B CN 113981709 B CN113981709 B CN 113981709B CN 202111349400 A CN202111349400 A CN 202111349400A CN 113981709 B CN113981709 B CN 113981709B
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coating
release paper
parts
leather
double
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CN113981709A (en
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陈群雄
赵志国
谢丽娟
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Feng'an Leather Co ltd
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Feng'an Leather Co ltd
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
    • D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
    • D06N3/145—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes two or more layers of polyurethanes
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/007—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by mechanical or physical treatments
    • D06N3/0077—Embossing; Pressing of the surface; Tumbling and crumbling; Cracking; Cooling; Heating, e.g. mirror finish
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0086—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique
    • D06N3/0095—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique by inversion technique; by transfer processes
    • D06N3/0097—Release surface, e.g. separation sheets; Silicone papers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N2209/00—Properties of the materials
    • D06N2209/08—Properties of the materials having optical properties
    • D06N2209/0807—Coloured
    • D06N2209/0823—Coloured within the layer by addition of a colorant, e.g. pigments, dyes
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N2209/00—Properties of the materials
    • D06N2209/08—Properties of the materials having optical properties
    • D06N2209/0807—Coloured
    • D06N2209/083—Multi-coloured
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N2211/00—Specially adapted uses
    • D06N2211/12—Decorative or sun protection articles
    • D06N2211/28—Artificial leather
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)

Abstract

The invention relates to the leather field, and provides a method for manufacturing double-color leather with three-dimensional effect, which comprises the following steps: a. selecting and cutting release paper: selecting release paper with flexibility, marking as release paper I, and cutting according to the requirement; b. folding and forming; c. preparation of the composite layer: aligning and superposing the release paper I and the artificial leather to form a composite layer, and wrapping the artificial leather layer in the composite layer on the outer surface of the first coating roller; d. preparing coating slurry: preparing a first coating slurry and a second coating slurry respectively; e. coating a first coating: the first coating slurry is coated on release paper II in a scraping way to form a first coating; f. and (2) coating a second coating: blade-coating the second coating slurry on the first coating to form a second coating; g. laminating and pressing; h. curing and stripping: and (3) coiling the semi-finished product, standing and curing at normal temperature, and then stripping the release paper II to obtain the double-color leather finished product. The produced leather has excellent double-color effect, natural and novel texture and strong three-dimensional layering sense.

Description

Manufacturing method of double-color leather with stereoscopic impression
Technical Field
The invention relates to the technical field of leather, in particular to a method for manufacturing double-color leather with three-dimensional effect.
Background
Along with the development of society and the progress of human civilization, people have higher requirements on leather, so that not only are leather colors and designs diversified, but also leather is required to have multiple functions, such as wear resistance, water resistance, sun protection and the like. Chinese patent application No. 201110190140.6 discloses a method for manufacturing double-color synthetic leather, which comprises the following steps: (1) Uniformly stirring 5-10 parts of dimethylformamide and 0.5-2 parts of color paste, and filtering; (2) Uniformly stirring 100-200 parts of dimethylformamide and 20-30 parts of wood flour for swelling, and then adding the mixture filtered in the step (1) for uniform stirring for later use; (3) Adding 100 parts of polyurethane wet resin into the mixture formed in the step (2), uniformly stirring, defoaming, coating on textile fabric fibers, immersing in 18-22% dimethylformamide solution for solidification, and performing water rolling, water washing and drying to obtain wet bass; (4) 100 parts of polyurethane dry resin, 15-20 parts of dimethylformamide, 15-20 parts of butanone, 15-20 parts of toluene, 0.5-1.0 part of auxiliary agent and 3-5 parts of toner are uniformly mixed and coated on release paper to obtain a dry-process veneer, the release paper is separated after being stuck with wet bass and dried, a dye solution is coated on the dry-process veneer, and a finished product is obtained after drying at 90-120 ℃ and washing, dehydrating and drying. The invention ensures that the synthetic leather finished product has a double-color effect, and the finished product has bright and gorgeous color.
PU leather is favored by consumers because of its excellent performance, is known as a fifth plastic, and is widely applied to various fields of national economy, including light industry, chemical industry, electronics, textile, medical treatment, construction, automobiles, national defense, aviation and the like. The traditional PU leather mainly takes single color, and develops the PU leather with double-color effect along with the development of technology, thereby improving the added value of the product and being deeply favored by consumers. The existing PU leather with the bicolor effect is prepared by dry film pasting, and the production process is as follows: release paper, primary coating, drying, secondary coating, drying, gluing, laminating, pressing, coiling, curing, stripping, checking and obtaining a finished product. For example, chinese patent application No.: 201811051315.3 discloses an animal-grain double-colored leather, which comprises leather materials, a first coating and a second coating, wherein the second coating and the first coating are sequentially coated on the leather materials, and the manufacturing method comprises the following steps: preparing paint, coating paint, pasting and baking. The animal-grain double-color leather prepared by the preparation method has animal grains on the surface, and has strong stereoscopic impression, excellent hand feeling and strong color fastness. However, the existing bicolor PU leather has the following defects: first, in the knife coating process, the release paper is easy to break, and the production efficiency of the finished product is reduced. Second, the primary coating slurry is typically formed from a dark toner, a PU resin, a solvent, and an auxiliary agent, and a large amount of the dark toner is often added to ensure the hiding effect of the coating.
Disclosure of Invention
Therefore, the present invention provides a method for manufacturing a bicolor leather with three-dimensional effect.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
a method for manufacturing double-color leather with three-dimensional effect comprises the following steps:
step one: selecting and cutting release paper
Selecting release paper with flexibility, marking as release paper I, and cutting according to the required proportion;
step two: fold forming
After the release paper I is wetted, the release paper I presents natural and uniform fold textures through mechanical equipment or manual flower pinching;
step three: preparation of the composite layer
Selecting artificial leather with the same size as the release paper I, aligning and superposing the release paper I and the artificial leather to form a composite layer, rolling the composite layer to be tightly pressed, and wrapping the artificial leather layer in the composite layer on the outer surface of the first coating roller after drying;
step four: preparation of coating slurry
Weighing the following raw materials in parts by weight: 100 parts of PU resin, 0.3-0.5 part of dark color toner and 70 parts of solvent, and uniformly mixing and stirring the raw materials to obtain first coating slurry;
weighing the following raw materials in parts by weight: 100 parts of PU resin, 3-10 parts of light-colored toner and 70 parts of solvent, and uniformly mixing and stirring the raw materials to obtain second coating slurry;
step five: applying a first coating
Another roll of release paper is taken and marked as release paper II, the release paper enters a production line through a paper roll, when the release paper passes through a first coating roller wrapped with a composite layer, a first coating slurry is scraped and coated on the release paper II through a first scraper to form a first coating, and a first oven is used for primary drying;
step six: applying a second coating
Continuously conveying the dried release paper II, scraping and coating second coating slurry on the first coating through a second scraper when the release paper II passes through a second coating roller to form a second coating, and performing secondary drying by using a second oven;
step seven: laminating and pressing
Coating the dried release paper II with an adhesive, then attaching the release paper II with the beef two-layer crust leather, and pressing the release paper II with the beef two-layer crust leather through a pressing machine to firmly adhere the release paper II and the beef two-layer crust leather to obtain a semi-finished product;
step eight: curing and peeling
And (3) coiling the semi-finished product, standing for curing, and then stripping the release paper II to obtain the required double-color leather finished product.
The further improvement is that: the difference between the cutting width of the release paper I and the length of the first coating roller is in the range of 0-5 cm.
The further improvement is that: the first coating is dried by adopting stepped temperature rise, the temperature of the oven is divided into four areas from an inlet to an outlet, and the temperature of each area is sequentially set to be 48-54 ℃, 65-75 ℃, 85-95 ℃ and 95-105 ℃.
The further improvement is that: the thickness of the first coating layer is 150-200 mu m.
The further improvement is that: the second coating is dried by adopting stepped temperature rise, the temperature of the oven is divided into four areas from an inlet to an outlet, and the temperature of each area is sequentially set to be 48-54 ℃, 65-75 ℃, 85-95 ℃ and 95-105 ℃.
The further improvement is that: the thickness of the second coating layer is 150-200 mu m.
The further improvement is that: the first coating slurry is replaced by the following raw materials in parts by weight: 100 parts of PU resin, 0.5-0.8 part of medium-color toner and 70 parts of solvent, wherein the second coating slurry is replaced by the following raw materials in parts by weight: 100 parts of PU resin, 18-25 parts of light-colored toner and 70 parts of solvent.
The further improvement is that: and step seven, technological parameters during lamination: the air pressure is 800kPa, and the pressure is 1.2-1.95t.
By adopting the technical scheme, the invention has the beneficial effects that:
the invention breaks through the conventional manufacturing method of the double-color leather, and the produced leather has excellent double-color effect, natural and novel texture and strong three-dimensional layering sense. Compared with the prior art, the invention takes the release paper, the release paper is adhered with the artificial leather to form the composite layer after the fold forming, and the composite layer is wrapped on the outer surface of the first coating roller, so that the preparation is fully made for coating the release paper II with the coating, the defects of easy breakage and difficult polishing in the process of blade coating the release paper are overcome, and meanwhile, the template effect is exerted through the arrangement of the composite layer, so that the stereoscopic vision effect of the PU leather is greatly improved. The invention does not change the original production line equipment, only upgrades the first coating process, realizes continuous and stable production of products, and reduces energy consumption and production cost. When the existing bicolor PU leather is produced, a large amount of dark color toner is required to be added in one coating slurry in order to ensure the covering effect of the coating.
Drawings
FIG. 1 is a flow chart of the production process of the present invention;
FIG. 2 is a bicolor leather product prepared in example 1 of the present invention.
Detailed Description
The following describes embodiments of the present invention in detail with reference to specific examples, so as to solve the technical problem by applying the technical means to the present invention, and the implementation process for achieving the technical effect can be fully understood and implemented accordingly.
Unless otherwise indicated, the technical means employed in the examples are conventional means well known to those skilled in the art, and the reagents and products employed are also commercially available. The sources of the reagents used, the trade names and the members of the list of constituents which are necessary are all indicated at the first occurrence.
Example 1
Referring to fig. 1 and 2, a method for manufacturing a double-color leather with three-dimensional effect includes the following steps:
step one: selecting and cutting release paper
Selecting release paper with flexibility, marking as release paper I, and cutting the release paper I into the same width as the length of the first coating roller;
step two: fold forming
After the release paper I is wetted, the release paper I presents natural and uniform fold textures through mechanical equipment or manual flower pinching;
step three: preparation of the composite layer
Selecting artificial leather with the same size as the release paper I, aligning and superposing the release paper I and the artificial leather to form a composite layer, rolling the composite layer to be tightly pressed, and wrapping the artificial leather layer in the composite layer on the outer surface of the first coating roller after drying;
step four: preparation of coating slurry
Weighing the following raw materials in parts by weight: 100 parts of PU resin, 0.3 part of dark color toner and 70 parts of butanone, and uniformly mixing and stirring the raw materials to obtain first coating slurry;
weighing the following raw materials in parts by weight: 100 parts of PU resin, 3 parts of light-colored toner and 70 parts of butanone, and uniformly mixing and stirring the raw materials to obtain second coating slurry;
step five: applying a first coating
Another roll of release paper is taken and marked as release paper II, the release paper enters a production line through a paper winding drum, when the release paper passes through a first coating roller coated with a composite layer, a first coating slurry is coated on the release paper II through a first scraper to form a first coating, a first oven is used for primary drying, the temperature of the oven is divided into four areas from an inlet to an outlet, the temperature of each area is sequentially set to be 50 ℃, 70 ℃, 90 ℃ and 100 ℃, and the thickness of the first coating is 200 mu m;
step six: applying a second coating
And continuously conveying the dried release paper II, scraping and coating second coating slurry on the first coating through a second scraper when the release paper II passes through a second coating roller to form a second coating, and performing secondary drying by using a second drying oven, wherein the temperature of the drying oven is divided into four areas from an inlet to an outlet, the temperature of each area is sequentially set to be 50 ℃, 70 ℃, 90 ℃ and 100 ℃, and the thickness of the second coating is 200 mu m.
Step seven: laminating and pressing
Coating the dried release paper II with an adhesive, then attaching the release paper II with the beef two-layer crust leather, and pressing the release paper II by a pressing machine, wherein the technological parameters of the pressing machine are as follows: the diameter of the cylinder is 100mm, the air pressure is 800kPa, and the pressure is 1.2t, so that the release paper II and the cow crust leather are firmly bonded to obtain a semi-finished product;
step eight: curing and peeling
And (3) coiling the semi-finished product, standing and curing at normal temperature, and then stripping the release paper II to obtain the required double-color leather finished product.
The meaning of the labels in fig. 1 is as follows:
1-release paper II; 2-a paper roll; 3-a composite layer; 4-a first coating roller; 5-a first scraper; 6-a first oven; 7-a first guide roller; 8-a second guide roller; 9-a second coating roller; 10-a second scraper; 11-a second oven; 12-a third guide roller; 13-fourth guide rollers; 14-a third coating roller; 15-a third scraper; 16-bovine crust leather; 17-upper pressing rollers; 18-pressing down the roller.
Example 2
A method for manufacturing double-color leather with three-dimensional effect comprises the following steps:
step one: selecting and cutting release paper
Selecting release paper with flexibility, marking as release paper I, and cutting the release paper I into the same width as the length of the first coating roller;
step two: fold forming
After the release paper I is wetted, the release paper I presents natural and uniform fold textures through mechanical equipment or manual flower pinching;
step three: preparation of the composite layer
Selecting artificial leather with the same size as the release paper I, aligning and superposing the release paper I and the artificial leather to form a composite layer, rolling the composite layer to be tightly pressed, and wrapping the artificial leather layer in the composite layer on the outer surface of the first coating roller after drying;
step four: preparation of coating slurry
Weighing the following raw materials in parts by weight: 100 parts of PU resin, 0.4 part of dark color toner and 70 parts of butanone, and uniformly mixing and stirring the raw materials to obtain first coating slurry;
weighing the following raw materials in parts by weight: 100 parts of PU resin, 6 parts of light-colored toner and 70 parts of butanone, and uniformly mixing and stirring the raw materials to obtain second coating slurry;
step five: applying a first coating
Another roll of release paper is taken and marked as release paper II, the release paper enters a production line through a paper winding drum, when the release paper passes through a first coating roller coated with a composite layer, a first coating slurry is coated on the release paper II through a first scraper to form a first coating, a baking oven is used for primary baking, the temperature of the baking oven is divided into four areas from an inlet to an outlet, the temperature of each area is sequentially set to 48 ℃, 65 ℃, 85 ℃ and 95 ℃, and the thickness of the first coating is 160 mu m;
step six: applying a second coating
And continuously conveying the dried release paper II, scraping and coating second coating slurry on the first coating through a second scraper when the release paper II passes through a second coating roller to form a second coating, drying the second coating by using a drying oven, wherein the temperature of the drying oven is divided into four areas from an inlet to an outlet, the temperature of each area is sequentially 48 ℃, 65 ℃, 85 ℃ and 95 ℃, and the thickness of the second coating is 160 mu m.
Step seven: laminating and pressing
Coating the dried release paper II with an adhesive, then attaching the release paper II with the beef two-layer crust leather, and pressing the release paper II by a pressing machine, wherein the technological parameters of the pressing machine are as follows: the diameter of the cylinder is 125mm, the air pressure is 800kPa, and the pressure is 1.95t, so that the release paper II and the cow crust leather are firmly bonded to obtain a semi-finished product;
step eight: curing and peeling
And (3) coiling the semi-finished product, standing and curing at normal temperature, and then stripping the release paper II to obtain the required double-color leather finished product.
Example 3
A method for manufacturing double-color leather with three-dimensional effect comprises the following steps:
step one: selecting and cutting release paper
Selecting release paper with flexibility, marking as release paper I, and cutting the release paper I into the same width as the length of the first coating roller;
step two: fold forming
After the release paper I is wetted, the release paper I presents natural and uniform fold textures through mechanical equipment or manual flower pinching;
step three: preparation of the composite layer
Selecting artificial leather with the same size as the release paper I, aligning and superposing the release paper I and the artificial leather to form a composite layer, rolling the composite layer to be tightly pressed, and wrapping the artificial leather layer in the composite layer on the outer surface of the first coating roller after drying;
step four: preparation of coating slurry
Weighing the following raw materials in parts by weight: 100 parts of PU resin, 0.5 part of dark color toner and 70 parts of butanone, and uniformly mixing and stirring the raw materials to obtain first coating slurry;
weighing the following raw materials in parts by weight: 100 parts of PU resin, 10 parts of light-colored toner and 70 parts of butanone, and uniformly mixing and stirring the raw materials to obtain second coating slurry;
step five: applying a first coating
Another roll of release paper is taken and marked as release paper II, the release paper enters a production line through a paper winding drum, when the release paper passes through a first coating roller coated with a composite layer, a first coating slurry is coated on the release paper II through a first scraper to form a first coating, a baking oven is used for primary baking, the temperature of the baking oven is divided into four areas from an inlet to an outlet, the temperature of each area is set to be 54 ℃, 75 ℃, 95 ℃ and 105 ℃ in sequence, and the thickness of the first coating is 180 mu m;
step six: applying a second coating
And continuously conveying the dried release paper II, scraping and coating second coating slurry on the first coating through a second scraper when the release paper II passes through a second coating roller to form a second coating, drying the second coating by using a drying oven, wherein the temperature of the drying oven is divided into four areas from an inlet to an outlet, the temperature of each area is set to be 54 ℃, 75 ℃, 95 ℃ and 105 ℃ in sequence, and the thickness of the second coating is 180 mu m.
Step seven: laminating and pressing
Coating the dried release paper II with an adhesive, then attaching the release paper II with the beef two-layer crust leather, and pressing the release paper II by a pressing machine, wherein the technological parameters of the pressing machine are as follows: the diameter of the cylinder is 100mm, the air pressure is 800kPa, and the pressure is 1.2t, so that the release paper II and the cow crust leather are firmly bonded to obtain a semi-finished product;
step eight: curing and peeling
And (3) coiling the semi-finished product, standing and curing at normal temperature, and then stripping the release paper II to obtain the required double-color leather finished product.
Example 4
The difference between the method for manufacturing the double-color leather with the stereoscopic impression and the embodiment 1 is that: the first coating slurry consists of the following raw materials in parts by weight: 100 parts of PU resin, 0.5 part of medium-color toner and 70 parts of butanone, wherein the second coating slurry consists of the following raw materials in parts by weight: 100 parts of PU resin, 18 parts of light-colored toner and 70 parts of butanone. The remaining operating steps and process parameters were identical to those of example 1.
Example 5
The difference between the method for manufacturing the double-color leather with the stereoscopic impression and the embodiment 1 is that: the first coating slurry consists of the following raw materials in parts by weight: 100 parts of PU resin, 0.6 part of medium-color toner and 70 parts of butanone, wherein the second coating slurry consists of the following raw materials in parts by weight: 100 parts of PU resin, 22 parts of light-colored toner and 70 parts of butanone. The remaining operating steps and process parameters were identical to those of example 1.
Example 6
The difference between the method for manufacturing the double-color leather with the stereoscopic impression and the embodiment 1 is that: the first coating slurry consists of the following raw materials in parts by weight: 100 parts of PU resin, 0.8 part of medium-color toner and 70 parts of butanone, wherein the second coating slurry consists of the following raw materials in parts by weight: 100 parts of PU resin, 25 parts of light-colored toner and 70 parts of butanone. The remaining operating steps and process parameters were identical to those of example 1.
The above description is illustrative of the embodiments using the present teachings, and is not intended to limit the scope of the present teachings to any particular modification or variation of the present teachings by those skilled in the art.

Claims (8)

1. A method for manufacturing double-color leather with three-dimensional effect is characterized in that: the method comprises the following steps:
step one: selecting and cutting release paper
Selecting release paper with flexibility, marking as release paper I, and cutting according to the required proportion;
step two: fold forming
After the release paper I is wetted, the release paper I presents natural and uniform fold textures through mechanical equipment or manual flower pinching;
step three: preparation of the composite layer
Selecting artificial leather with the same size as the release paper I, aligning and superposing the release paper I and the artificial leather to form a composite layer, rolling the composite layer to be tightly pressed, and wrapping the artificial leather layer in the composite layer on the outer surface of the first coating roller after drying;
step four: preparation of coating slurry
Weighing the following raw materials in parts by weight: 100 parts of PU resin, 0.3-0.5 part of dark color toner and 70 parts of solvent, and uniformly mixing and stirring the raw materials to obtain first coating slurry;
weighing the following raw materials in parts by weight: 100 parts of PU resin, 3-10 parts of light-colored toner and 70 parts of solvent, and uniformly mixing and stirring the raw materials to obtain second coating slurry;
step five: applying a first coating
Another roll of release paper is taken and marked as release paper II, the release paper enters a production line through a paper roll, when the release paper passes through a first coating roller wrapped with a composite layer, a first coating slurry is scraped and coated on the release paper II through a first scraper to form a first coating, and a first oven is used for primary drying;
step six: applying a second coating
Continuously conveying the dried release paper II, scraping and coating second coating slurry on the first coating through a second scraper when the release paper II passes through a second coating roller to form a second coating, and performing secondary drying by using a second oven;
step seven: laminating and pressing
Coating the dried release paper II with an adhesive, then attaching the release paper II with the beef two-layer crust leather, and pressing the release paper II with the beef two-layer crust leather through a pressing machine to firmly adhere the release paper II and the beef two-layer crust leather to obtain a semi-finished product;
step eight: curing and peeling
And (3) coiling the semi-finished product, standing for curing, and then stripping the release paper II to obtain the required double-color leather finished product.
2. The method for manufacturing the double-color leather with the stereoscopic impression according to claim 1, wherein the method comprises the following steps of: the difference between the cutting width of the release paper I and the length of the first coating roller is in the range of 0-5 cm.
3. The method for manufacturing the double-color leather with the stereoscopic impression according to claim 1, wherein the method comprises the following steps of: the first coating is dried by adopting stepped temperature rise, the temperature of the oven is divided into four areas from an inlet to an outlet, and the temperature of each area is sequentially set to be 48-54 ℃, 65-75 ℃, 85-95 ℃ and 95-105 ℃.
4. The method for manufacturing the double-color leather with the stereoscopic impression according to claim 1, wherein the method comprises the following steps of: the thickness of the first coating layer is 150-200 mu m.
5. The method for manufacturing the double-color leather with the stereoscopic impression according to claim 1, wherein the method comprises the following steps of: the second coating is dried by adopting stepped temperature rise, the temperature of the oven is divided into four areas from an inlet to an outlet, and the temperature of each area is sequentially set to be 48-54 ℃, 65-75 ℃, 85-95 ℃ and 95-105 ℃.
6. The method for manufacturing the double-color leather with the stereoscopic impression according to claim 1, wherein the method comprises the following steps of: the thickness of the second coating layer is 150-200 mu m.
7. The method for manufacturing the double-color leather with the stereoscopic impression according to claim 1, wherein the method comprises the following steps of: the first coating slurry is replaced by the following raw materials in parts by weight: 100 parts of PU resin, 0.5-0.8 part of medium-color toner and 70 parts of solvent, wherein the second coating slurry is replaced by the following raw materials in parts by weight: 100 parts of PU resin, 18-25 parts of light-colored toner and 70 parts of solvent.
8. The method for manufacturing the double-color leather with the stereoscopic impression according to claim 1, wherein the method comprises the following steps of: and step seven, technological parameters during lamination: the air pressure is 800kPa, and the pressure is 1.2-1.95t.
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