WO2017188722A1

WO2017188722A1 - Artificial leather for vehicle interior material, and manufacturing method therefor

Info

Publication number: WO2017188722A1
Application number: PCT/KR2017/004428
Authority: WO
Inventors: 민철희; 정용배
Original assignee: (주)엘지하우시스
Priority date: 2016-04-29
Filing date: 2017-04-26
Publication date: 2017-11-02
Also published as: KR101816392B1; KR20170123431A

Abstract

Disclosed is artificial leather for a vehicle interior material, having an excellent surface property and cushiony feeling. According to the present invention, the artificial leather for a vehicle interior material comprises: a fabric layer; a foam layer formed on the fabric layer; a cover layer formed on the foam layer; and an aqueous surface treatment layer formed on the cover layer, wherein an embossed pattern is formed on the surface of the aqueous surface treatment layer.

Description

Artificial leather for automobile interior and its manufacturing method

The present invention relates to an artificial leather for automobile interior materials having excellent physical properties and a method of manufacturing the same.

Artificial leather makes up a large part of the interior of a car. Recently, in order to secure a clean environment and physical properties that are not harmful to the human body, research on artificial leather for automobile interior materials is actively being conducted.

Generally, artificial leather is manufactured using polyvinyl chloride (PVC) or polyurethane (PU) as a material.

Artificial leather made of PVC is manufactured by laminating a PVC foam layer and a PVC label layer on a fabric layer in a calendar method, and then foaming at a temperature of approximately 200 ° C. However, it is difficult to provide artificial leather having excellent abrasion resistance and surface properties only with PVC material.

In addition, the artificial leather made of PU is manufactured by laminating an adhesive layer and a PU label layer on a fabric layer by casting, and the PU material is difficult to foam, and thus, artificial leather having a cushioning feeling. There is a problem that is difficult to provide.

Therefore, there is a demand for artificial leather having excellent abrasion resistance and cushioning.

Background art related to the present invention is Republic of Korea Patent Publication No. 10-0873655 (2008.12.05. Registered), the document discloses flame retardant fibish artificial leather and a manufacturing method thereof.

An object of the present invention is to provide an artificial leather for automotive interior having excellent surface properties and cushioning (feel).

Another object of the present invention is to provide a method of manufacturing artificial leather.

Artificial leather for car interior material layer in accordance with the present invention for achieving the above object; A foam layer formed on the fabric layer; A label layer formed on the foam layer; And an aqueous surface treatment layer formed on the label layer, wherein the embossed pattern is formed on the surface of the aqueous surface treatment layer.

The label layer may be formed from a label layer composition comprising a polyurethane (PU) -based resin.

The cover layer may be formed by a rotary screen process.

The foam layer may be formed from a foam layer composition comprising a polyvinyl chloride (PVC) resin and a foaming agent.

The foam layer composition may include 5 to 10 parts by weight of a blowing agent based on 100 parts by weight of polyvinyl chloride resin.

The thickness of the foam layer may be 0.2 ~ 0.4mm.

The label layer may have a thickness of 50 μm to 100 μm.

The aqueous surface treatment layer is polyurethane (PU) -based resin; Curing agent containing 1 or more types of isocyanate group and carbodiimide group; And an aqueous solvent comprising at least one of water and alcohol.

The fabric layer may be a woven or nonwoven fabric including one or more of cotton, nylon, polyester, and rayon.

Method of manufacturing artificial leather for automobile interior according to the present invention for achieving the above another object (a) on the fabric layer by a calender process using a foam layer composition comprising a polyvinyl chloride (PVC) resin and a blowing agent Forming a foam layer to prepare a sheet; (b) forming a label layer on the sheet by a rotary screen process using a label layer composition comprising a polyurethane (PU) resin; (c) forming an aqueous surface treatment layer on the label layer; And (d) forming an embossed pattern on the surface of the aqueous surface treatment layer.

Foam layer of step (a) may be formed by foaming at a temperature of 220 ~ 230 ℃.

The calendar process of step (a) may be performed using a roller having a temperature of 100 ~ 200 ℃.

The aqueous surface treatment layer of step (c) may be formed by performing a gravure coating process.

The embossed pattern of step (d) may be formed by performing a vacuum embossing process.

The vacuum embossing process may be performed under a vacuum gauge pressure of 0.04 to 0.07 MPa.

The vacuum embossing process may be performed at a temperature of 160 ~ 180 ℃.

The artificial leather for automobile interior according to the present invention has an excellent cushioning effect compared to the artificial leather manufactured only with conventional PVC or PU material by the laminated structure of the PVC foam layer and the PU cover layer.

In addition, by forming an aqueous surface treatment layer on the PU label layer, it is possible to improve surface properties such as wear resistance and feel.

In the present invention, the cover layer including the PU material may be formed on the foam layer including the PVC material without the need for an adhesive layer using a rotary screen process. Accordingly, the embossed pattern can be directly formed by a vacuum embossing process without using a release paper.

In addition, the production method of artificial leather for automobile interior of the present invention is improved productivity and workability by a calender process, a rotary screen process and a gravure coating process.

Figure 1 shows a cross-sectional view of the artificial leather for automobile interior according to the present invention.

Figure 2 is a flow chart illustrating a manufacturing method of artificial leather for automobile interior according to the present invention.

Figure 3 shows a rotary screen process diagram according to the present invention.

Figure 4 shows a photograph taken a cross section of the artificial leather foam layer for automobile interior according to the first embodiment of the present invention.

Figure 5 shows a picture of the product (a) containing the normal far-end layer of the present invention and the product (b) including a far-end layer having a wrinkled wrinkles.

[Description of the code]

10: fabric layer

20: foam layer

30: cover layer

40: aqueous surface treatment layer

S110: foam layer formed on the fabric layer

S120: cover layer formation

S130: forming an aqueous surface treatment layer

S140: Embossed Formation

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to artificial leather for automobile interior materials and a method of manufacturing the same according to a preferred embodiment of the present invention.

Leather used for automobile interior is divided into natural leather and artificial leather. Since natural leather is expensive and supplies are not smooth, the use of artificial leather is increasing. As mentioned above, artificial leather is generally made of PVC or PU material. Artificial leather made of PVC material has the disadvantage that the wear resistance is weak, the artificial leather made of PU material has a problem that the cushioning feeling is lowered due to the foaming deterioration.

The present invention provides an artificial leather for automobile interior materials having excellent cushioning and durability through a configuration including a foam layer including a PVC material and a cover layer including a PU material. In addition, the artificial leather of the present invention has an effect of excellent surface properties by forming an aqueous surface treatment layer and an embossed pattern on the top of the artificial leather.

In the present invention, the PVC foam layer means a foam layer containing a PVC material, the PU label layer means a cover layer containing a PU material.

Figure 1 shows a cross-sectional view of the artificial leather for automobile interior according to the present invention. Artificial leather for automobile interior material layer 10 according to the present invention; A foam layer 20 formed on the fabric layer; A label layer 30 formed on the foam layer; And an aqueous surface treatment layer 40 formed on the label layer, wherein an embossed pattern is formed on the surface of the aqueous surface treatment layer.

The far end layer 10 is a part which is in contact with the vehicle seat frame side, in order to secure rigidity, the thickness is uniform, the dimensional stability is high, it is preferable not to be deformed by heat and pressure. The fabric layer 10 may be a woven or nonwoven fabric including one or more of cotton, nylon, polyester, and rayon.

The foam layer 20 may be formed from a foam layer composition including a polyvinyl chloride (PVC) resin and a foaming agent. The foamed layer 20 may be formed by mixing a polyvinyl chloride resin and a foaming agent to prepare a foamed layer composition, and applying the composition to a predetermined thickness and then foaming the composition at about 220 to 230 ° C. The foam layer composition may include polyvinylidene chloride (PVDC) resin, chlorinated polyvinyl chloride (CPVC) resin, etc. in addition to the polyvinyl chloride resin. On the other hand, in the case of artificial leather made of a PU material, it is manufactured by laminating an adhesive layer and a PU label layer on a fabric layer and then performing foaming and drying. The thickness of the PU label layer is thin as 30 ~ 70㎛, accordingly, there is a high probability of pores on the surface of the product when foaming. Therefore, the artificial leather made of PU material is difficult to foam, it is difficult to provide an artificial leather with a cushion (cushion) feeling.

The blowing agent is azodicarbonamide (ADCA, Azodicarbonamide), p, p'-oxybisbenzenesulfonyl hydrazide (p, p'-Oxybis (benzenesulfonyl hydrazide)), p-toluenesulfonyl hydrazide (p- toluenesulfonyl hydrazide) and sodium bicarbonate, and the like, but are not limited thereto. After the blowing agent is foamed at approximately 220 ~ 230 ℃, it may have a volume increase rate of 100 ~ 500% by volume. In the process of foaming, the gas generated from the foaming agent may form bubbles to form a foaming cell in the foaming layer 20. The foaming cell may be a spherical foaming cell, and all of the walls of the pores are formed in a closed structure, and are also called independent pores or closed cells as pores not connected to other pores. Since the foamed cell is not deformed by physical external force, it is possible to improve the soft characteristics and cushioning of the foamed layer 20.

The foam layer composition may include 5 to 10 parts by weight of a blowing agent based on 100 parts by weight of polyvinyl chloride resin. When the foaming agent is included in less than 5 parts by weight, the softness and cushioning of the artificial leather may be lowered. On the contrary, when it exceeds 10 parts by weight, the foam cells of the foam layer are excessively generated, resulting in a decrease in surface properties or durability.

The foam layer composition may further include a plasticizer and a heat stabilizer to control the melt strength during foaming.

The thickness of the foam layer formed through the foaming process may be 0.2 ~ 0.4mm.

When the thickness of the foam layer is less than 0.2mm, since the thickness is thin, the cushioning of the artificial leather can be reduced, there is a problem that the pattern of the fabric layer woven fabric is exposed to the product surface. On the contrary, when the thickness exceeds 0.4 mm, there is a problem in that the wrinkle wrinkles occur on the surface of the product. By folding wrinkles, when the artificial leather is bent for a long time, the shape of the foamed cell is deformed and fixed, so that deep wrinkles are generated as shown in FIG. Such bending wrinkles have a problem that is not restored even through heat or steam treatment.

The label layer 30 serves to secure surface smoothness, provide color, and may be formed from a label layer composition including a polyurethane (PU) -based resin. The polyurethane resin may be prepared by polymerizing a polycarbonate diol, a polyether diol or a diol containing a carboxyl group, and a diisocyanate compound at about 80 to 100 ° C. Since the produced polyurethane-based resin does not contain volatile organic compounds such as toluene, it is easy to disperse water, does not adversely affect the human body, and is environmentally friendly. For this reason, the label layer 30 is excellent in compatibility with the aqueous surface treatment layer 40 described later, there is an advantage that can improve the surface properties such as touch.

The cover layer 30 may have a thickness of 50 μm to 100 μm. If the thickness of the cover layer 30 is less than 50㎛, it may be difficult to secure the surface smoothness, if it exceeds 100㎛, the cushioning of the artificial leather may be lowered or the adhesive strength with the foam layer.

The aqueous surface treatment layer 40 improves scratch resistance, stain resistance and surface properties, and provides an environmentally friendly effect. The aqueous surface treatment layer 40 is a polyurethane resin; Curing agent containing 1 or more types of isocyanate group and carbodiimide group; And an aqueous solvent comprising at least one of water and alcohol.

As described above, the polyurethane-based resin included in the aqueous coating composition may be the same as the polyurethane-based resin of the label layer 30. Curing agents containing the isocyanate group include toluene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, naphthalene diisocyanate and the like. The curing agent containing the carbodiimide group is 1-ethyl-3- (3-dimethylamino) propyl) carbodiimide (1-ethyl-3- (3- (dimethylamino) propyl) carbodiimide Etc. The aqueous solvent is a solvent in contrast to the organic solvent, it may mean a solvent having an OH group. The water-based coating composition may improve pollution resistance by including an aqueous solvent such as water and alcohol.

An embossed pattern (not shown) is formed on the surface of the aqueous surface treatment layer, and the embossed pattern imparts an excellent surface texture to the artificial leather for automobile interior materials and improves surface durability.

Manufacturing method of artificial leather for automobile interior according to the present invention is the foam layer forming step (S110), the cover layer forming step (S120), the aqueous surface treatment layer forming step (S130) and the embossing pattern forming step (S140) on the fabric layer It includes.

Fabric layer On Foam layer Formation step (S110)

After preparing the fabric layer 10, by performing a calendar (Calendar) process to form a foam layer 20 on the fabric layer 10 to prepare a sheet. At this time, the foam layer 20 is formed from a foam layer composition containing a polyvinyl chloride (PVC) resin and a blowing agent.

The calendering process is a roller compaction is performed at the same time as passing the raw material between the rollers rotating in the opposite direction, and then includes a cooling process. In the calendering process, the raw material may be kneaded at a temperature of 100 to 200 ° C. before passing the raw material between the rollers, but is not limited thereto.

For example, the foam layer composition may be passed through a calender roller to form a pre-foam layer on the fabric layer 10. The calender roller is maintained at a temperature of approximately 100 ~ 200 ℃, the average rotational speed of the calender roller may be 30m / min ~ 100m / min. When the temperature of the calender roller is less than 100 ° C, melting of the foam layer composition is not sufficiently performed. On the contrary, when it exceeds 200 ° C., shear strength between calender rollers may occur, and adhesion or premature foaming of the foam layer composition may occur on the roller surface.

The preliminary foam layer is foamed at a temperature of 220 ~ 230 ℃ to form a foam layer (20). When the foaming temperature is less than 220 ° C, the heat transfer of the foam layer is insufficient to reduce the foamability. When the foaming temperature exceeds 230 ℃, the over-foaming phenomenon may occur, bubbles may occur on the surface of the product, there is a problem that the wrinkles occur on the surface of the product. The fabric layer 10 and the foam layer 20 is then cooled to room temperature, thereby producing a semi-finished sheet.

Cover layer Formation step (S120)

The cover layer 30 is formed on the sheet by performing a rotary screen process. At this time, the label layer is formed from a label layer composition containing a polyurethane (PU) resin.

The rotary screen process is a process in which the raw material is coated on the sheet by rotating the screen net after inputting the raw material into the screen net. More specifically, referring to FIG. 3, different colors and patterns may be formed on fabric layers such as fibers, fabrics, etc. using color reservoirs and screen rollers.

For example, after injecting the sheet of semi-finished product into the rotary screen device, a polyurethane resin is applied onto the sheet by a rotating screen roller to form a label layer. At this time, the liquid polyurethane (PU) resin stored in the raw material reservoir is supplied to the screen roller. The raw material reservoir may be one or more, injecting a polyurethane resin into the first raw material reservoir, injecting a separate raw material that can give color to the second raw material reservoir, and then rotating the screen roller connected to each reservoir By doing so, a label layer having a color can also be formed.

In addition to the rotary screen process, a printing method such as comma coating may be applied, but it is preferable to apply a rotary screen process to secure the surface smoothness of the cover layer 30. As such, when performing the rotary screen process, the cover layer including the PU material may be formed on the foam layer including the PVC material without the need for the adhesive layer. In addition, although the embossed pattern was previously formed using a release paper, in the present invention, the embossed pattern may be directly formed by a vacuum embossing process without using a release paper by forming a cover layer including a PU material by performing a rotary screen process. .

Mercury Surface treatment layer Formation step (S130)

A gravure coating process is performed to form an aqueous surface treatment layer 40 on the label layer 30.

The gravure coating process may include a direct gravure coating, a reverse gravure coating, an offset gravure coating, and the like. A direct gravure coating is one in which coating is performed on a substrate between a roller formed of an elastic rubber and a roller containing a coating liquid, and the rotational speed of these rollers may be the same. In addition, the rotation direction of the substrate and the rollers may be reversed. Reverse gravure coating has the opposite direction of rotation of the substrate and the rollers, it is possible to control the application amount by adjusting the speed of the roller. In the offset gravure coating, the respective rollers are driven independently of each other, and the coating layer can be uniformly formed in a small amount by high speed.

The aqueous coating composition is as described above, and by forming the aqueous surface treatment layer 40, the artificial leather of the present invention can improve scratch resistance, stain resistance, and provide an environmentally friendly effect.

Emboss Pattern forming step (S140)

An embossed pattern (not shown) is formed on the surface of the aqueous surface treatment layer 40. The embossed pattern may be formed by performing a vacuum embossing process. Vacuum embossing process is a method of transferring the embossed pattern by sucking the artificial leather under a vacuum gauge pressure of 0.04 ~ 0.07MPa. When the vacuum embossing process is performed at less than 0.04 MPa, it is difficult to form an embossed pattern and the cushioning feeling may be lowered. On the contrary, when it is performed in excess of 0.07 MPa, the aqueous surface treatment layer 40 may be damaged or surface properties may be degraded.

In addition, the vacuum embossing process may be performed at a temperature of 160 ~ 180 ℃.

When the temperature is less than 160 ° C., it is difficult to sufficiently form the embossed pattern. When the temperature is more than 180 ° C., the surface properties of the artificial leather become rough or torn due to high temperature.

Conventionally, in order to form the embossed pattern was performed by dipping the uneven pattern with a roller, this has a limitation in providing an artificial leather with excellent surface properties. In the present invention, surface properties such as touch can be improved by increasing the feeling of cushioning and softness by the vacuum embossing step.

As described above, the artificial leather for automobile interior material of the present invention is excellent in surface smoothness and can form a uniform layer through a manufacturing method such as a calender process and a rotary screen process. In addition, through a laminated structure including a PVC foam layer, a PU label layer, and an aqueous surface treatment layer, there is an effect of excellent surface properties and thickness of the artificial leather.

As described above with respect to the artificial leather for automobile interior materials and a method of manufacturing the same as follows.

1. 자동차 내장재용 인조가죽의 제조1. Manufacturing of artificial leather for automobile interior

Example One

A nonwoven fabric made of cotton, including cotton, was cut to a thickness of 0.6 mm to prepare a fabric layer. After performing a calendering process to form a pre-foam layer on the fabric layer, it was foamed at a temperature of 220 ℃ to form a foam layer of 0.3mm thickness. The foam layer was formed from a foam layer composition containing 5 parts by weight of azodicarbonamide as a foaming agent with respect to 100 parts by weight of polyvinyl chloride resin.

Subsequently, a polyurethane resin was applied onto the foam layer by a rotating screen roller to perform a rotary screen process to form a label layer.

Subsequently, an aqueous coating composition was prepared comprising a polyurethane resin, toluene diisocyanate as a curing agent, and water as an aqueous solvent. A gravure coating process was performed using this, and an aqueous surface treatment layer having a thickness of 20 μm was formed on the label layer.

Subsequently, a vacuum embossing process is performed on the resultant formed with the aqueous surface treatment layer under a vacuum gage pressure of 0.06 MPa and a temperature of 170 to form an embossed pattern on the surface of the aqueous surface treatment layer for automobile interior materials. Artificial leather was produced.

Comparative example One

Through a calendering process, a laminate in which a label layer and an aqueous surface treatment layer were laminated from a pre-foam layer formed of a foam layer composition containing a polyvinyl chloride resin and a polyvinyl chloride resin on a fabric layer were laminated. Subsequently, after the laminate was foamed at a temperature of 220, an artificial leather for automobile interior was manufactured in the same manner as in Example 1, except that the vacuum embossing process was performed.

Comparative example 2

Through a calendering process, a laminate in which an adhesive layer, a pre-foamed layer formed from a foamed layer composition containing a polyurethane resin, and an aqueous surface treatment layer were laminated on a fabric layer was prepared. Subsequently, after the laminate was foamed at a temperature of 220, a foam layer having a thickness of 50 μm was formed, except that a roll pressing process was performed under a pressure of 4 MPa using an embossing roll having an embossed pattern. Artificial leather for automobile interior was manufactured in the same manner as in Example 1.

Comparative example 3

An artificial leather for automobile interior was manufactured in the same manner as in Example 1, except that the cover layer was formed by performing a comma coating.

2. 물성 평가 방법 및 그 결과2. Method of evaluating physical properties

Measurement of the surface smoothness of the label layer: When the surface of the label layer is not smooth or cracks are described as "excellent", it is described as "normal" when the surface of the label layer is not smooth or torn.

Measurement of softness: at a temperature of 23 ± 2 ° C. and a relative humidity of 50 ± 5%, it is shown in Table 1 below using a ductility measuring instrument (manufacturer, ST300D). Specifically, after preparing five test pieces having pi (π) of 100 mm for the artificial leather for automobile interior materials, the softness can be measured by reading the numerical value of the scale moved for 15 seconds by pressing the ST300D device.

Pore / break wrinkles on the surface of the product: When the porosity and break wrinkles occurred in the product surface of less than 10%, "none", if more than 10% occurred "marked".

TABLE 1

Referring to Table 1 and FIG. 4, it can be seen that the artificial leather for automobile interior materials prepared in Example 1 exhibits excellent cushioning feeling due to high ductility because foam cells are formed in the foam layer. In addition, by performing the vacuum embossing process in Example 1, it can be seen that the embossed pattern (not shown) on the surface of the aqueous surface treatment layer is formed to have excellent surface texture and surface durability on the artificial leather. In addition, in the case of Comparative Example 3 formed by performing a comma coating instead of the cover layer was performed with a rotary screen, the surface of the cover layer was not smooth, and the tearing occurred.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments and can be manufactured in various forms, and having ordinary skill in the art to which the present invention pertains. It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

Claims

Distal layer;

A foam layer formed on the fabric layer;

A label layer formed on the foam layer; And

It includes; an aqueous surface treatment layer formed on the label layer,

Artificial leather for automobile interior, characterized in that the embossed pattern is formed on the surface of the aqueous surface treatment layer.
The method of claim 1,

The cover layer is artificial leather for automobile interior, characterized in that formed from a cover layer composition comprising a polyurethane (PU) resin.
The method of claim 1,

The cover layer is an artificial leather for automobile interior, characterized in that formed by a rotary screen (Rotary Screen) process.
The method of claim 1,

The foam layer is artificial leather for automobile interior, characterized in that formed from a foam layer composition comprising a polyvinyl chloride (PVC) resin and a blowing agent.
The method of claim 4, wherein

The foam layer composition is artificial leather for automobile interior, characterized in that containing 5 to 10 parts by weight of the blowing agent with respect to 100 parts by weight of polyvinyl chloride resin.
The method of claim 1,

The thickness of the foam layer is artificial leather for automobile interiors, characterized in that 0.2 ~ 0.4mm.
The method of claim 1,

The thickness of the cover layer is artificial leather for automobile interiors, characterized in that 50 ~ 100㎛.
The method of claim 1,

The aqueous surface treatment layer is polyurethane (PU) -based resin; Curing agent containing 1 or more types of isocyanate group and carbodiimide group; And an aqueous solvent comprising at least one of water and an alcohol.
The method of claim 1,

The fabric layer is artificial leather for automobile interior, characterized in that the woven or non-woven fabric containing at least one of cotton, nylon, polyester and rayon.
(a) preparing a sheet by forming a foam layer on a fabric layer by a calender process using a foam layer composition comprising a polyvinyl chloride (PVC) resin and a blowing agent;

(b) forming a label layer on the sheet by a rotary screen process using a label layer composition comprising a polyurethane (PU) resin;

(c) forming an aqueous surface treatment layer on the label layer; And

(d) forming an embossed pattern on the surface of the aqueous surface treatment layer; manufacturing method of artificial leather for automobile interiors comprising the.
The method of claim 10,

The foaming layer of step (a) is a method of manufacturing artificial leather for automobile interiors, characterized in that formed by foaming at a temperature of 220 ~ 230 ℃.
The method of claim 10,

The calendar process of step (a) is a method of manufacturing artificial leather for automobile interiors, characterized in that is carried out using a roller having a temperature of 100 ~ 200 ℃.
The method of claim 10,

The aqueous surface treatment layer of step (c) is a manufacturing method of artificial leather for automobile interior, characterized in that formed by performing a gravure coating process (gravure).
The method of claim 10,

The embossed pattern of step (d) is formed by performing a vacuum embossing (Vacuum embossing) manufacturing method of artificial leather for automobile interiors.
The method of claim 14,

The vacuum embossing process is a manufacturing method of artificial leather for automobile interior, characterized in that carried out under a vacuum gauge (Vacuum gauge) pressure of 0.04 ~ 0.07MPa.
The method of claim 14,

The vacuum embossing process is a method of manufacturing artificial leather for automobile interiors, characterized in that carried out at a temperature of 160 ~ 180 ℃.