KR20200062051A - A sheet for vehicle interior material and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a sheet for a vehicle interior material, in which the content of impurities in a foam layer is minimized, and which comprises: a fabric layer; a foam layer formed on the fabric layer; and a cover layer formed on the foam layer.

Description

Seat for automobile interior material and its manufacturing method{A SHEET FOR VEHICLE INTERIOR MATERIAL AND METHOD FOR MANUFACTURING THE SAME}

The present invention relates to a seat for automobile interior materials and a method for manufacturing the same.

Artificial leather occupies a large part of the interior of the car. Recently, in order to secure a clean environment and properties that are not harmful to the human body, studies on artificial leather for interior materials of automobiles have been actively conducted.

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

Among them, a sheet for automobile interior materials made of PVC is manufactured by laminating a PVC foam layer and a PVC cover layer on a fabric layer in a calendar method, and then foaming at a temperature of approximately 200°C.

Background art related to the manufacture of such a seat for automobile interior materials is Korean Patent Publication No. 10-2017-0123431, and the document discloses a seat for automobile interior materials and a manufacturing method thereof.

However, the cover layer and the foam layer have to be prepared separately in the form of a sheet, and the manufacturing process has a complicated problem because it is manufactured through a process of foaming in an oven. In addition, since the foaming agent and the foaming stabilizer are used in a large amount, there is a problem of environmental pollution due to an increase in cost and chemical use.

Republic of Korea Patent Publication No. 10-2017-0123431, artificial leather for automobile interior material and its manufacturing method

In order to solve the above problems, the present inventors have studied a method of manufacturing a sheet for a vehicle interior material that can improve productivity by shortening a process for manufacturing a sheet for a vehicle interior material through an extrusion foaming process rather than a conventional oven-type foaming process. As a result, the present invention was completed.

Therefore, the object of the present invention is to not only improve the productivity by shortening the manufacturing process of the automotive interior sheet, but also use a small amount of the blowing agent and the foam stabilizer to reduce the cost and reduce environmental pollution. It is to provide a manufacturing process.

In order to achieve the above object,

The present invention is a fabric layer; A foam layer formed on the fabric layer; And a cover layer formed on the foam layer, and a foam stabilizer in an amount of 2.0 parts by weight or less compared to 100 parts by weight of polyvinyl chloride (PVC) resin in the foam layer.

In addition, the present invention a) preparing a composition for a foam layer comprising a polyvinyl chloride (PVC) resin and a blowing agent; b) preparing a composition for a cover layer comprising polyvinyl chloride (PVC) resin; And c) extruding and foaming the composition for the foam layer and the composition for the cover layer by coextrusion, followed by heat-sealing to form a foam layer and a cover layer on the fabric layer. do.

The sheet for automobile interior materials according to the present invention can not only improve the productivity by shortening the manufacturing process for the automobile interior sheet through an extrusion foaming process, but rather a conventional oven-type foaming process, and use a small amount of foaming agent and foam stabilizer. As it can reduce cost and reduce environmental pollution, it is suitable for use as a seat for automobile interior materials.

1 is a schematic view showing the configuration of a seat for a vehicle interior material of the present invention.
Figure 2 is a process diagram showing a conventional method for manufacturing a seat for automobile interior materials.
3 is a process chart showing a method of manufacturing a seat for automobile interior materials of the present invention.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the embodiments allow the disclosure of the present invention to be complete, and the ordinary knowledge in the technical field to which the present invention pertains. It is provided to fully inform the holder of the scope of the invention, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the seat for automobile interior materials according to a preferred embodiment of the present invention.

Seat for a vehicle interior material according to the present invention, the fabric layer; A foam layer formed on the fabric layer; And a cover layer formed on the foam layer, wherein the foam stabilizer contains 2.0 parts by weight or less compared to 100 parts by weight of polyvinyl chloride (PVC) resin in the foam layer.

As a result of experiments conducted by the present inventors, in the case of a conventional sheet for automobile interior materials, a large amount of a metal salt used as a foam stabilizer is included in the final product sheet for automobile interior materials as a large amount of foaming agent and foam stabilizer are used. Not only is it bad, but there is a problem of destroying the environment according to the use of a large amount of foam stabilizer in the manufacturing process, there is a need for improvement in use as a structural material for household appliances (TV back cover, board for washing machines, etc.) and automobile interior sheet.

However, the present inventors not only can improve productivity by shortening the manufacturing process of the sheet for automobile interior materials through an extrusion foaming process rather than a conventional oven-type foaming process, but also reduce the cost by using a small amount of foaming agent and foaming stabilizer, Since it is possible to reduce environmental pollution, it has been possible to manufacture a seat for a car interior material suitable for use as a seat for a car interior material.

Seat for automobile interior materials

1 is a sectional view showing a seat for a vehicle interior material according to the present invention. The seat for automobile interior materials according to the present invention includes: 　 raw monolayer 10; A “foaming layer 20” formed on the “primary layer”; And a “cover layer 30” formed on the “foaming layer”; and a foaming stabilizer in an amount of 2.0 parts by weight or less compared to 100 parts by weight of polyvinyl chloride (PVC) resin in the foam layer.

The seat for automobile interior materials according to the present invention includes a fabric layer.

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

The seat for automobile interior materials according to the present invention includes a foam layer 20.

The foam layer 20 is formed on the fabric layer 10, it may be formed from a foam composition comprising a polyvinyl chloride (PVC) resin and a blowing agent. The polyvinyl chloride resin and the foaming agent are mixed to prepare a foamed layer composition, and the foamed layer 20 can be formed by extrusion foaming with a composition for a cover layer, which will be described later. The foam layer composition may include polyvinylidene chloride (PVDC) resin, chlorinated polyvinyl chloride (CPVC) resin, etc. in addition to the polyvinyl chloride resin and the blowing agent.

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

In addition, the foam layer 20 of the present invention includes a polyvinyl chloride (CPVC) resin, and a foam stabilizer derived from the foaming agent. Since the foam stabilizer is a metal salt, when used in a large amount, there is a problem of environmental pollution.

In the present invention, as the foaming process to be described later is improved, the amount of the foaming agent and the foaming stabilizer used in the foaming process is minimized, and specifically, the content of the foaming stabilizer contained in the foaming layer is 1.0% by weight or less based on the total weight of the foaming layer. It may be, preferably 0.75% by weight or less, more preferably 0.5% by weight or less, and most preferably 0.3% by weight or less.

As the foaming stabilizer, a lead-based stabilizer, a Ca-Zn-based stabilizer, a Ba-Zn-based stabilizer, a tin-based stabilizer, or the like can be used. Specifically, the lead-based stabilizers include Tribasic Lead Sulphate (TLS), Dibasic Lead Phosphite (DLP), Dibasic Lead Stearate (DLS), Lead Stearate, etc. Can be used. Further, as the Ca-Zn-based stabilizer, a mixture of calcium stearate salt and zinc stearate salt, a mixture of calcium carboxylate salt and zinc carboxylate salt, or the like can be used. Further, as the Ba-Zn-based stabilizer, a mixture of a barium stearate salt and a zinc stearate salt, a mixture of a barium carboxylate salt and a zinc carboxylate salt, or the like can be used. Further, as the tin-based stabilizer, mercaptide tin salt, laurate tin salt, malate tin salt, or the like can be used.

The thickness of the foam layer formed through the foaming process may be 0.1 to 1.0 mm, and preferably 0.2 to 0.4 mm.

If the thickness of the foam layer is less than 0.1mm, since the thickness is thin, the cushioning feeling of the sheet for interior materials may be deteriorated, and there is a problem in that the pattern of the fabric layer is exposed on the surface of the product. Conversely, when the thickness exceeds 1.0 mm, when the sheet for interior material is bent for a long time, the shape of the foam cell is deformed and fixed, and deep wrinkles may be generated on the product surface.

In contrast to the prior art, the seat for automobile interior materials of the present invention is characterized in that the foaming efficiency is very excellent despite the use of a small amount of foaming agent, although the process is simplified. do. When the foaming agent is used in such a small amount, a foaming stabilizer which is inevitably included in accordance with the use of the foaming agent, that is, in direct proportion to the amount of use, can be used. The characteristics of the seat for automobile interior materials of the present invention can be expressed by the X value in Equation 1 below.

[Equation 1]

X = foaming rate (%) / foam stabilizer content (% by weight)

(Equation 1 above,

The foaming rate is a value (%) obtained by ((specific gravity before foaming / specific gravity after foaming) x 100-100),

The content of the foam stabilizer is the content ratio (% by weight) of the foam stabilizer contained in the foam layer,

Equation 1 is a value expressed by the ratio of the numerical value, ignoring the units of the foaming rate and the content of the foam stabilizer.)

In the seat for automobile interior materials of the present invention, the foam layer may have an X value represented by the following Equation 1 of 30 or more, preferably 100 or more, more preferably 150 or more, and more preferably It may be 200 or more, very preferably 250 or more, and most preferably 280 or more.

The seat for automobile interior materials of the present invention can exhibit a very high foaming rate despite having a very small amount of foam stabilizer, and thus a very small amount of foam stabilizer, as it has the X value as described above.

The seat for automobile interior materials according to the present invention includes a cover layer 30.

The cover layer 30 is formed on the foam layer 20, secures the surface smoothness, serves to provide a color, can be formed from a cover layer composition comprising a polyvinyl chloride (PVC) resin have. The polyvinyl chloride (PVC) resin includes a polyvinyl chloride resin, and may include polyvinylidene chloride (PVDC) resin, chlorinated polyvinyl chloride (CPVC) resin, and the like.

The thickness of the cover layer 30 may be 0.1 to 0.3 mm. When the thickness of the cover layer 30 is less than 0.1 mm, it may be difficult to secure the surface smoothness, and when it exceeds 0.3 mm, the cushioning feeling of the artificial leather may be lowered or the adhesive strength with the foam layer may be lowered.

The polyvinyl chloride (PVC) resin used in the foam layer 20 and the cover layer 30 of the present invention may be soft PVC. Specifically, the polyvinyl chloride (PVC) resin used in the foam layer 20 and the cover layer 30 of the present invention is 50 parts by weight or more of the plasticizer, specifically 50 parts by weight with respect to 100 parts by weight of the polyvinyl chloride resin. It may be a soft PVC to 100 parts by weight.

The seat for automobile interior materials according to the present invention includes a surface treatment layer (not shown).

The surface treatment layer is formed on the cover layer 30, improves scratch resistance, contamination resistance and surface properties, and provides an environmentally friendly effect. Such a surface treatment layer can be formed using what is conventionally used in the industry.

Method for manufacturing automobile interior seat

Figure 2 is a process diagram showing a method of manufacturing a seat for automobile interior materials according to the prior invention.

According to a conventional process, after the fabric layer is prepared, a calender process is performed to form a prefoaming layer on the fabric layer, and then a cover layer is formed thereon through a screen process or the like. This was heat-sealed, and then foamed in an oven to prepare a sheet comprising a foam layer and a cover layer.

However, according to the conventional process, the cover layer and the foam layer must be separately prepared in a sheet form, and the manufacturing process has a complicated problem because it is manufactured through a process of foaming in an oven. In addition, since the foaming agent and the foam stabilizer are used in a large amount, there is a problem of environmental pollution due to an increase in cost and use of chemicals.

In order to solve the above problems, the present inventors have studied a method of manufacturing a sheet for a vehicle interior material that can improve productivity by shortening a process for manufacturing a sheet for a vehicle interior material through an extrusion foaming process rather than a conventional oven-type foaming process. As a result, the present invention was completed.

Figure 3 shows a manufacturing process diagram of a vehicle interior sheet according to the present invention.

Method for manufacturing a seat for automobile interior materials according to the present invention,

a) preparing a composition for a foamed layer comprising a polyvinyl chloride (PVC) resin and a blowing agent; b) preparing a composition for a cover layer comprising polyvinyl chloride (PVC) resin; And c) extruding and foaming the composition for the foam layer and the composition for the cover layer by coextrusion, followed by heat-sealing to form a foam layer and a cover layer on the fabric layer.

First, a method of manufacturing a sheet for automobile interior material according to the present invention includes a) preparing a composition for a foam layer comprising a polyvinyl chloride (PVC) resin and a blowing agent.

The composition for the foam layer may include 0.1 to 5.0 parts by weight of the blowing agent, and more preferably 0.3 to 2.5 parts by weight based on 100 parts by weight of the polyvinyl chloride resin. When the blowing agent is included in less than 0.1 parts by weight, the foaming ratio may not come out as desired. Conversely, when it exceeds 5.0 parts by weight, over-foaming may occur, and the foam cell structure may be destroyed, thereby deteriorating physical properties.

The foam layer composition may further include a foaming agent stabilizer to control the foaming agent during foaming. The foaming stabilizer may contain 0.1 to 2.0 parts by weight of the foaming stabilizer based on 100 parts by weight of the polyvinyl chloride resin. In addition, to control the melt strength, it may further include a plasticizer or a heat-resistant stabilizer.

In addition, the contents of the polyvinyl chloride (PVC) resin, the foaming agent and the foaming stabilizer are the same as described above.

Next, a method of manufacturing a sheet for automobile interior material according to the present invention includes a step b) of preparing a composition for a cover layer comprising a polyvinyl chloride (PVC) resin.

The composition for the cover layer includes polyvinyl chloride (PVC) resin.

In addition, the contents of the polyvinyl chloride (PVC) resin are the same as described above.

Further, the polyvinyl chloride (PVC) resin used in the composition for the foam layer and the composition for the cover layer may be soft PVC. Specifically, the polyvinyl chloride (PVC) resin used in the composition for the foam layer and the composition for the cover layer of the present invention may be soft PVC having a plasticizer content of 50 parts by weight or more. Specifically, the composition for the foamed layer and the composition for the foamed layer may include 50 to 100 parts by weight of a plasticizer with respect to 100 parts by weight of the polyvinyl chloride resin.

Next, the method for manufacturing a sheet for automobile interior material according to the present invention comprises: extruding and foaming the composition for the foam layer and the composition for the cover layer by coextrusion, and then heat-sealing to form a foam layer and a cover layer on the fabric layer. It includes.

The method of manufacturing a sheet for automobile interior materials according to the present invention uses the coextrusion as described above, and simultaneously extrudes the composition for the foam layer and the composition for the cover layer, followed by foaming at the same time, to double the lamination process of the foam layer and the cover layer. No need, it can be done in just one process. In addition to this, in contrast to the normal foaming process, only a small amount of 1 part by weight or less based on 100 parts by weight of polyvinyl chloride resin was used in excess of 5 parts by weight or more based on 100 parts by weight of polyvinyl chloride resin in the conventional process. Since only foaming agents can be used, foaming can be performed, and thus there is an advantage in that various harmful impurities derived from the foaming agent can be minimized.

In the method of manufacturing a seat for automobile interior materials according to the present invention, the coextrusion may be performed under conditions of a cover layer processing temperature of 100 to 150°C and a foam layer processing temperature of 150 to 210°C. At this time, if the processing temperature of the foam layer exceeds 210°C, over-foaming may occur and foam gas may leak to the surface and impair the surface quality. When the processing temperature of the foam layer is 150°C or less, foaming occurs and unfoaming occurs. Rate and sheet properties may be impaired.

The heat fusion can be performed for 15 to 60 seconds at a temperature of 70 to 100 ℃.

The method for manufacturing a seat for a vehicle interior material according to the present invention may further include, if necessary, a step d) of forming a surface treatment layer after the step c).

The step d) is performed to improve scratch resistance, fouling resistance and surface properties, and provide an environmentally friendly effect, and a conventional method used in the art may be used.

As described above, the sheet for a vehicle interior material according to the present invention can not only improve the productivity by shortening the manufacturing process for the vehicle interior material sheet through an extrusion foaming process rather than a conventional oven-type foaming process, but also a foaming agent and a foam stabilizer. It is suitable for use as a seat for automobile interior materials because it can reduce costs and reduce environmental pollution by using a small amount of.

Hereinafter, preferred examples are provided to help understanding of the present invention, but the following examples are only illustrative of the present invention, and it is apparent to those skilled in the art that various changes and modifications are possible within the scope and technical thought scope of the present invention. It is natural that changes and modifications fall within the scope of the appended claims.

Examples: Example 1 and Comparative Examples 1 to 2

(1) Manufacture of seats for automobile interior materials

[Production Example 1]

The polyvinyl chloride resin was mixed so that the foaming agent (azodicarbonamide) was 0.5% by weight, and the foaming stabilizer (1: 1 mixture of barium carboxylate and zinc carboxylate) was 0.25% by weight, thereby preparing a composition for a foam layer. . As the composition for the cover layer, polyvinyl chloride resin was used.

[Production Example 2]

The polyvinyl chloride resin was mixed so that the foaming agent (azodicarbonamide) was 5% by weight and the foaming stabilizer (1: 1 mixture of barium carboxylate and zinc carboxylate) was 1.25% by weight to prepare a composition for a foam layer. . As the composition for the cover layer, polyvinyl chloride resin was used.

[Example 1]

By performing a coextrusion process, a foam layer composition of Preparation Example 1 and a label layer composition were processed on the foam layer at temperatures of 200°C and 130°C, respectively, to thereby form a cover/foam layer having a total thickness of 0.5 mm. Subsequently, a car seat was manufactured by heat-sealing the fabric layer cut to a thickness of 0.5 mm at a temperature of 90°C at the bottom of the cover/foam layer.

[Example 2]

By performing a coextrusion process, the foam layer composition of Preparation Example 1 was processed as a label layer composition on the foam layer at a temperature of 180° C. and 130° C., respectively, and a cover/foam layer having a total thickness of 0.5 mm was formed. Was manufactured in the same manner as in Example 1.

[Comparative Example 1]

The nonwoven fabric of the fabric material was cut to a thickness of 0.5 m to prepare a fabric layer. After performing a calendering process, a prefoaming layer was formed on the fabric layer with the composition for a foaming layer of Preparation Example 2, and then foamed at a temperature of 220° C. to form a foam layer having a thickness of 0.3 mm. Subsequently, a polyvinyl chloride resin was applied as a composition for a cover layer on the foam layer by a rotating screen roller by performing a rotary screen process to form a cover layer.

Experimental Example: Measurement of physical properties of automobile seats

1. Measurement of softness characteristics of automobile seats

The sheet for automobile interior materials prepared in Example 1 and Comparative Example 1 prepared above were listed in Table 1 below using a ductility measuring device (ST300D) at a temperature of 23±2° C. and a relative humidity of 50±5%. Specifically, after preparing five test pieces with a pi (π) of 100 mm for the vehicle seat, the ductility can be measured by reading the numerical value of the scale moved for 15 seconds by pressing it with an ST300D device.

division Softness Example 1 4.1 Comparative Example 1 3.8

Referring to Table 1, in the case of the sheet for automobile interior materials of Example 1, it was found that softness is improved compared to the sheet for automobile interior materials of Comparative Example 1 conventionally used.

2. Check the ratio of the foaming rate and foaming stabilizer content of the foam layer of the car seat

The X values of Equation 1 using the foaming rate through the difference in the content of the foam stabilizer and the specific gravity before and after foaming of the foam layer of the sheet for automobile interior materials prepared in Examples 1 to 2 and Comparative Example 1 are shown in Table 2 below. Did.

[Formula 1] X = foaming rate (%) / foam stabilizer content (% by weight)

(In the above formula 1, the foaming rate is (% specific gravity before foaming / specific gravity after foaming) x 100-100 (%), the content of the foaming stabilizer is the content ratio (% by weight) of the foaming stabilizer included in the foam layer, Equation 1 is a value expressed by the ratio of the numerical value, ignoring the units of the foaming rate and the content of the foam stabilizer.)

At this time, the specific gravity of the foam layer was measured by using a hydrometer (Mettler Toredo, XPE304).

At this time, the residual content of the foam stabilizer, 100 g of the foam layer of the sheet for automobile interior materials was freeze-crushed at 10,000 rpm for 10 minutes using a Rotor Mill, and then decomposed with 37 wt% hydrochloric acid to prepare a test solution. In the obtained decomposition solution, metal elements were quantified by Agilent 5110.

division Process conditions Foam stabilizer
Input content
(weight%) Foam stabilizer
Residual content
(weight%) Specific gravity (g/cc) Firing rate X value Before firing After firing Example 1 Coextrusion of foam layer 200℃, cover layer 130℃ 0.25 0.24 1.1 0.64 72.5 302.1 Example 2 Coextrusion of foam layer 180℃, cover layer 130℃ 0.25 0.25 1.1 0.66 66.4 265.6 Comparative Example 1 Oven foaming 220℃ calendering process foaming 1.25 1.22 1.1 0.82 33.5 27.5

Referring to Table 2, in the case of the sheet for automobile interior materials of Examples 1 to 2, compared to the sheet for automobile interior materials of Comparative Example 1, although the amount of the foam stabilizer is very small, the amount of the foam stabilizer is very low. It was found that the rate was rather superior. Therefore, it was found that the X value of Equation 1, which represents the foaming ratio compared to the amount of the blowing agent used in Examples 1 to 2, was significantly higher than that in Comparative Example 1.

Through this, as the cover layer and the foam layer are manufactured by extrusion foaming by coextrusion, despite the simplification of the process, the content of the foam stabilizer that not only produces the physical properties of the car interior material but has an equal or higher effect, and can also cause environmental pollution. It was confirmed that it was significantly reduced.

10: fabric layer
20: foam layer
30: cover layer

Claims (16)

Fabric layer;
A foam layer formed on the fabric layer; And
Includes; a cover layer formed on the foam layer,
A sheet for automobile interior material containing less than 2.0 parts by weight of a foam stabilizer compared to 100 parts by weight of polyvinyl chloride (PVC) resin in the foam layer. According to claim 1,
The cover layer comprises a polyvinyl chloride (PVC) resin, a sheet for automobile interior materials. According to claim 1,
The foam layer includes a polyvinyl chloride (PVC) resin, a foaming agent and a foam stabilizer, a sheet for automobile interior materials. According to claim 1,
The foam layer has a thickness of 0.1 to 1.0mm, a sheet for automobile interior materials. According to claim 1,
The thickness of the cover layer is 0.1 to 0.3mm, automotive interior sheet. According to claim 1,
The fabric layer is a woven or non-woven fabric comprising at least one of cotton, nylon, polyester, and rayon, a sheet for automobile interior materials. According to claim 1,
The present stabilizer is a sheet for automotive interior materials, at least one selected from the group consisting of a lead-based stabilizer, a Ca-Zn-based stabilizer, a Ba-Zn-based stabilizer and a tin-based stabilizer. The method of claim 2 or 3,
The polyvinyl chloride (PVC) resin is a soft PVC, automotive interior sheet. According to claim 1,
A sheet for a vehicle interior material further comprising a surface treatment layer on the cover layer. According to claim 1,
The foam layer has a X value of 30 or more, represented by the following formula 1, automotive interior seat.
[Formula 1] X = foaming rate (%) / foam stabilizer content (% by weight)
(Equation 1 above,
The foaming rate (specific gravity before foaming / specific gravity after foaming) is a value (%) calculated by x100-100,
The content of the foam stabilizer is the content ratio (% by weight) of the foam stabilizer included in the foam layer,
Equation 1 is a value expressed by the ratio of the numerical value, ignoring the units of the foaming rate and the content of the foam stabilizer.) a) preparing a composition for a foamed layer comprising a polyvinyl chloride (PVC) resin and a blowing agent;
b) preparing a composition for a cover layer comprising polyvinyl chloride (PVC) resin; And
c) After extruding and foaming the composition for the foam layer and the composition for the cover layer by coextrusion, forming a foam layer and a cover layer on the fabric layer by heat-sealing; The method of claim 11,
The composition for the foam layer comprises a polyvinyl chloride resin 100 parts by weight, 0.1 to 1.0 parts by weight of a blowing agent, a method for manufacturing a sheet for automobile interior materials. The method of claim 12,
The composition for the foam layer further comprises 0.1 to 2.0 parts by weight of the foam stabilizer, based on 100 parts by weight of the polyvinyl chloride resin, a method for manufacturing a sheet for automobile interior materials. The method of claim 11,
The composition for the foam layer and the composition for the cover layer, 50 to 100 parts by weight of a plasticizer with respect to 100 parts by weight of polyvinyl chloride resin, a method for manufacturing a sheet for automobile interior materials. The method of claim 11,
The co-extrusion is performed under the conditions of a cover layer processing temperature of 100 to 150°C, and a foam layer processing temperature of 150 to 210°C. The method of claim 11,
After step c), d) forming a surface treatment layer; further comprising, a method for manufacturing a sheet for automobile interior materials.

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