JPS62174130A - Manufacture of trim - Google Patents

Abstract

PURPOSE:To contrive to save the weight of a trim itself and improve its resistance to shock, heat resistance, soundproofing property and the like by a method wherein two crosslinked foamed sheets, each of which consists of propylene- based polymer and ethylene-based polymer are laminated to each other. CONSTITUTION:A non-intumescent skin layer 3 is laminated to one side 6a of a crosslinked foamed sheet 6, which consists of propylene-based polymer and ethylene-based polymer, by extrusion-laminating a molten resin sheet 10 made of propylene-based polymer in order to mold a laminate A. At this time, uneven pattern 4 such as emboss pattern or the like is formed on the skin layer 3 by the uneven pattern of a hot pressing roll 9A. On the other hand, a non-intumescent skin layer 2 is laminated to one side 5a of a crosslinked foamed sheet 5, which consists of propylene-based polymer and ethylene-polymer, by extrusion-laminating the molten resin sheet 10 made of propylene-based polymer in order to mold a laminate B. The respective surfaces on the sides of the crosslinked foamed sheets 6 and 5 of both the laminates A and B are arranged face to face so as to be fixed by pressure with pressing rollers 17 and 17 while being melted with a hot melting means 16 in order to form a laminated material C.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing interior materials for automobiles, such as automobile ceiling materials, door lining materials, trunk room cloaks, and the like.

(Prior art) This type of interior material, for example, the molded ceiling of an automobile, has qualities such as rigidity, heat resistance, deep drawability, handling properties, and heat insulation, as well as beauty and softness as an interior material. required. In order to meet these quality requirements, relatively hard materials such as resin felt, plastic honeycomb, and cardboard have traditionally been used as base materials, and polyurethane foam, polyethylene foam, etc. have been used as surface materials. Pad material and a skin such as knit or PVC leather were generally used. For this type of molded ceiling, for example, non-foamed propylene polymer sheet/polypropylene foam/non-foamed propylene polymer sheet is used as the base material, and polyurethane foam/cloth, PVC leather, etc. A five-layer laminate has been devised, which is used as a surface material and is made by laminating these materials (see Japanese Utility Model Application Publication No. 148926/1983).

(Problems to be Solved by the Invention) However, such a molded ceiling has a complicated structure and a complicated manufacturing process, leading to a rise in manufacturing costs.

Furthermore, since a polyurethane foam that cannot be molded is used as the surface material, it is not possible to obtain a deep and sharp aesthetic appearance by heat molding, and there is also the problem that the desired aesthetic appearance cannot be obtained.

(Means for Solving the Problems) The interior material of the present invention is formed by laminating non-foamed skin layers made of a propylene polymer on both sides of a laminated foam sheet with a two-layer structure, and one skin layer. The laminated foam sheet has a structure in which an uneven pattern such as a squeeze pattern is formed on the surface of the layer, and the laminated foam sheet is made by laminating two crosslinked foam sheets made of a propylene polymer and an ethylene polymer with a heat-adhesive layer interposed between them. It becomes.

The skin layer is a substantially unfoamed polypropylene and propylene-based copolymer sheet with other monomers. Examples of propylene polymers constituting the skin layer include ethylene/propylene block copolymers,
Ethylene/bu-17pyrene random copolymer, ethylene/bu-17pyrene random copolymer,
Examples include α-olefin/propylene copolymers such as butene/propylene copolymers. Further, if necessary, inorganic or organic substances such as pigments, IfA agents, antistatic agents, antioxidants, and fillers can be added to these. Note that the thinner the skin layer 2.3 is, the lower its mechanical strength will be, and the thicker it will be, the heavier it will be.
Preferably, the number is 11.

Examples of the propylene polymer constituting the crosslinked foam sheet include a random copolymer of ethylene and propylene,
Examples include block copolymers, random block copolymers, and α=niolefin-propylene copolymers such as ethylene-butene-propylene copolymers. In addition, it is preferable that the melting point of the copolymer of the α-olefin to be copolymerized is between 130 and 170°C. Also,
The melt flow rate (MFR) of the propylene polymer is preferably 0.1 to 50, more preferably 0.3 to 30.
It is said that

The ethylene polymer that makes up the crosslinked foam sheet is
Examples include low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, ethylene/vinyl acetate copolymer, amorphous ethylene/propylene copolymer, etc. These may be used alone or in combination of two or more. can be used. M of these ethylene polymers
FR is preferably 0.1 to 50, more preferably 0.2
~30.

As the amount of polypropylene polymer increases, crosslinked foam sheets become more heat resistant and stiffer, but on the other hand, they tend to break more easily.
In particular, the impact strength at low temperatures is low, and it is too hard, resulting in poor cushioning properties. Furthermore, it becomes difficult to ripen the product in an extruder or the like, and decomposition of the crosslinking agent and blowing agent occurs, making it impossible to obtain a good molded product or a good foam. Conversely, when the amount of 5 in the polypropylene polymer decreases and the amount of ethylene polymer increases, physical properties such as heat resistance and mechanical strength decrease. Therefore, the amount of polypropylene polymer in the crosslinked foamed sheet 1- is preferably 10 to 80% by weight, more preferably 2% by weight.
The content is 0 to 70% by weight.

The cross-linked foam sheet is a highly foamed material with a foaming ratio of 10 to 10.
It is preferably 50 times, more preferably 20 to 40 times.

The thickness of the crosslinked foam sheet is preferably 1 to 5 mm, since the thinner the sheet, the lower the bending strength, and the thicker the sheet, the less economical it is.

Next, the relationship between the thicknesses of the layers constituting the interior material will be explained.

(A) The ratio Ts/Tf of the solid thickness Tf of the crosslinked foam sheet to the thickness Ts of the non-foamed skin layer is set to 1 to 5o. The solid wall thickness Tf refers to the thickness of a crosslinked foam sheet from which air has been extracted.

The reason for setting Ts/Tf will be explained below.

In order to improve the moldability of interior materials, it is necessary to eliminate so-called necking, a phenomenon in which the skin layer becomes locally thin during molding, causing the back side to be visible and cracks to form. In order to eliminate this necking, it is necessary to minimize the heat shrinkage of the laminated foam sheet.

If the ratio Ts/Tf between the solid wall thickness Tf and the wall thickness Ts is 1 or more, the proportion of the skin layer in the interior material will be dominant, and this skin layer with less distortion will naturally cause a cross-linked foam sheet that has a large heat shrinkage. It can be reinforced to minimize heat shrinkage of the inner layer material.

On the other hand, when Ts/Tr is greater than 50, the surface layer accounts for most of the interior material, making it difficult to obtain heat insulation properties, a soft feel, etc. for the interior material as a whole.

In addition, if Ts/rr is smaller than 1, the distortion of the cross-linked foam sheet will increase the heat shrinkage of the entire interior material.
＜Unfavorable.

Therefore, it is necessary to satisfy ■≦Ts/Tf≦50.

(B) The thickness T1 of the heat sealing layer is 0.1 to 0.5 mm, and is set to 1 to 25% of the thickness lγ of the crosslinked foam sheet.

The reason for setting the wall thickness TI will be explained below.

Lamination of cross-linked foam sheets is carried out by melting and crimping with gas flame, etc., but when joining the surfaces of the cross-linked foam sheets, sufficient heat is applied to the joint part to create a low temperature Q of 1 m or more. By forming a heat-fusion layer, which is a foamed or non-foamed layer, it is possible to remove the distortion fixed during the manufacture of the cross-linked foam sheet, and the heat during fusion also has the effect of annealing the distortion of the cross-linked foam sheet. . This results in good moldability. 1. When the cross-linked foam sheets are joined together by increasing the take-up speed, only the surface of the cross-linked foam sheets is melted in the case of a polyolefin foam with a low specific heat, making it possible to join the sheets, but on the other hand, a heat-sealing layer is formed. (Also, since annealing requires heat to act for a certain period of time or more, it is difficult to expect an annealing effect. Therefore, it is preferable that the take-up speed is not too high.

On the other hand, if the wall thickness T1 is larger than 0.5 m, it is difficult to obtain insulation properties and a soft feel as an interior material.

Therefore, it is necessary to satisfy Q, 1m≦T1≦0.5tm, and this relationship can be expressed in other words from the relationship with the expansion ratio and thickness of the crosslinked foam sheet: 1%≦(T1/thickness of the crosslinked foam sheet)≦25 It needs to be %.

Note that the present invention can be modified in various ways.

For example, the uneven pattern may be applied not only to one skin layer but also to the other skin layer, and the uneven pattern may be applied to both the upper and lower surfaces.

Next, a method for manufacturing an automobile interior material according to the present invention will be explained with reference to FIGS. 2 and 3.

fl, l A molten resin sheet of a propylene polymer is placed on one side 6a of a crosslinked foam sheet 6 made of a propylene polymer and an ethylene polymer prepared in advance using an extrusion mold 8 and a thermocompression roll 9A having an uneven surface. 10 is extrusion laminated and a non-foamed skin layer 3 is laminated thereon to form a first laminate product A. At this time, an uneven pattern 4 such as a squeeze pattern is formed on the skin layer 3 by the uneven pattern of the thermocompression roll 9A. In FIG. 2, 11 is a foam wrapped with a cross-linked foam sheet 6, 12 is a backup roll,
I3 is a guide roll, 14 is a take-up device, and 15 is a foam on which the laminate A is wound.

(2) On the other hand, one side 5 of a crosslinked foam sheet 5 made of a propylene polymer and an ethylene polymer manufactured in advance
A, a molten resin sheet 10 of a propylene polymer is extrusion laminated using an extrusion mold 8 and a thermocompression roll 9B having a flat surface, and a non-foamed skin layer 2 is laminated to form a second laminated product B. Form.

(3) Subsequently, these two laminates A and B are placed so that the surfaces of the respective crosslinked foam sheets 6.5 face each other, and then heated and melted by means 16 such as a gas flame or a strong infrared heater. , re-crosslinked foam sheet 5
．． A laminate material C is formed by pressing the surface of 6 with a pressure roll 17, 17 while melting. At this time, a heat sealing layer 7 is simultaneously formed on the crimped portion.

(4) Then, the laminated material C is cut into predetermined dimensions by the cutting device 18 to be used as an interior material for an automobile. In Figure 3,
19 is a take-up device, and 20 is a transport truck. In the manufacturing method of the present invention, a crosslinked foam sheet 5.6 and a skin layer 2.3 are respectively laminated by an extrusion lamination method. Depends on the reason.

In addition to the extrusion lamination method, the lamination method by thermal lamination of the crosslinked foam sheets 1 to 5.6 and the skin layer 2.3 includes the extrusion lamination method.
Possible methods include the hot roll lamination method (described later) and the three-layer coextrusion lamination method (described later).

However, the hot roll lamination method has poor moldability, and also has some problems with warping and wrinkling of the molded product and with adhesion. Furthermore, in the three-layer coextrusion lamination method, the molded product has good wrinkles and adhesion, but there are some problems with moldability and warpage of the molded product. Moreover, the three-layer coextrusion lamination method has the disadvantage that the apparatus is complicated and large.

On the other hand, the extrusion lamination method is good in terms of moldability, warpage and wrinkles of the molded product, and adhesion.

In addition, in the manufacturing method of the present invention, in the upper part of 11, the uneven pattern 4 is simultaneously formed during extrusion lamination (
The reason for this is as follows.

Other methods for creating the uneven pattern 4 on the laminate product A include: 1. Pasting the surface layer with the 3-dimensional pattern 4 on it in advance; (1) Heat the bent laminate product to near its melting point, and then roll it with a roll (1) to create an uneven pattern.

However, in the method (2), when forming the skin layer with a textured pattern, it is produced by pressing between a metal roll with a textured pattern and a hard rubber hack-up roll, so there are 1,000 parts of horns, which are removed in the subsequent process. This is one of the causes of forming defects (non-soaking defects) during hot forming.

In addition, method ■■ is used to reduce residual strain during hot forming due to the heat resistance required for the interior material (heat-resistant sagging in the case of ceiling materials, heat deformation in the case of door lining materials). It is preferable that the heating deformation temperature of the crosslinked foamed sheets 1 to 1, which are the inner layers that are difficult to be heated, is set slightly lower than that of the skin layer. However, when using method (■■) to create a textured pattern on such a laminated material, there is a problem that the textured pattern easily disappears during heat forming unless the skin layer is heated above its melting point during IJ with the textured pattern. Yes, on the other hand, if its melting point is
There is a risk that the cross-linked foam sheet will be damaged, which is not preferable.

On the other hand, in the present invention, since the uneven pattern 4 is simultaneously applied during extrusion lamination, the above-mentioned problem does not occur, and the skin layer 3 digs into the crosslinked foam sheet 6, resulting in an almost uniform wall thickness. It is formed.

(Function) The manufacturing method of the present invention includes: (1) forming a skin layer with almost no distortion on the surface of a crosslinked foam sheet by extrusion lamination; and (2) annealing by heating when laminating the skin layer on the surface of the crosslinked foam sheet. By stacking two cross-linked foam sheets one on top of the other, the heat shrinkage of the laminated foam sheets is averaged out as a whole; to suppress the strain fixed during the production of cross-linked foam sheets;
By reducing the heat shrinkage rate during hot molding as much as possible, stable and reliable moldability can be obtained.

The laminated foam sheet used for profiteering is made by laminating two cross-linked foam sheets made of propylene-based polymer and ethylene-based polymer, which reduces the weight of the automobile interior material itself and has sufficient impact resistance and rigidity. , heat resistance, moldability, handling properties, heat insulation properties, soundproofing properties, etc.

The non-foamed skin layer made of a propylene polymer laminated on both sides of the laminated foam sheet 1- has good moldability, and the desired aesthetic appearance such as a deep and sharp aesthetic appearance can be obtained by thermoforming, making it suitable as an interior material. Achieve a sense of beauty, softness, etc.

The concavo-convex pattern, such as a squeeze pattern, provided on at least one of the skin layers further enhances the beauty, softness, etc. of the interior material.

(Example) Next, the present invention will be explained in detail.

Examples and Comparative Examples 1.2 1 in the figure is an I-layer foam sheet, and the laminated foam sheet 1 is formed by laminating cross-linked foam sort 5.6. Polyethylene (density 0.
955, M F R6,0) 40 parts by weight, ethylene.
Butene polypropylene copolymer density 0.90, Ml
"R8, o, melting point 142°C) 40 layers, ethylene propylene block copolymer density 0°90, MFR5
, O1 melting point 165°C) is a closed-cell electron beam crosslinked foam sheet consisting of 20 parts by weight, with a foaming ratio of 30 times, a thickness of 2.5 mm, and a solid wall thickness Tf of 0.083 mm. There is.

Each of the cross-linked foam sheets 5 and 6 has a non-foamed skin layer 2.
3 is laminated, and the non-foamed skin layer 2.3 is L4F.
T? 2. The component is polypropylene pomopolymer with an O1 melting point of 163°C, and the wall thickness Ts is 0.2 m++.

Further, the thickness T1 of the heat-sealing layer 7 formed when the laminates A and B are bonded is 0.21111.

(1) In Figure 2, the mixed raw material for the epidermis layer 3 has a diameter of 90 mm.
The resin is supplied to an 11x-axis extruder, and extruded from an extrusion mold 8 at a resin temperature of 240°C to form a sheet.

Then, while applying this immediately to one side 6a of the crosslinked foam sheet 6 which has been roughened and manufactured, the thermocompression bonding roll 9A having an uneven pattern surface and the rubber hack-up roll 12
A non-foamed skin layer 3 is laminated by pressure bonding to form a laminate product. At this time, a thermocompression roll 9 is attached to the skin layer 3.
The uneven pattern A forms an uneven pattern 4 such as a shibori pattern.

The extrusion lamination speed at this time was 8 m/min.
, the speed at which the laminated product is picked up by the pulling device 14 is 3 m.
/min.

(2) On the other hand, in FIG. 2, the mixed raw material for the skin layer 2 is supplied to a single-screw extruder with a diameter of 90 mm, and extruded from an extrusion die 8 at a resin temperature of 240° C. to form a sheet 1 to a shape. While immediately applying this to one side 5a of the cross-linked foam sheet 5 manufactured in advance,
B and a non-foamed skin layer 2 are laminated by pressure bonding with a hack-up roll B 12 to form a laminate product B. Note that the extrusion lamination speed and the take-up speed of laminate product B were both under the same conditions as in step (1) above.

(3) Next, in Figure 3, non-foamed epidermis N2.3
Two laminate products A and B having on one side are arranged so that the surfaces of the crosslinked foam sheets 5.6 face each other.

After this, the foam sheet is re-crosslinked with a propane gas flame of 5.6
The surface of the laminate C was melted, immediately pressed with a pressure roll I7.17, and at the same time a heat-sealing layer 7 was formed and cooled to form a laminate C. The surface temperature of the crosslinked foam sheets 1 to 5.6 at the time of melting was about 160° C., and the take-up speed of the laminate C was 6 m/min.

(4) This laminated material C is cut by the cutting device 18: long side: short side -
Cut at a ratio of 1.4:1, making the area about 2.2M,
A laminated material (interior material) for molding large automobile parts was obtained. The thickness TI of the thermal adhesive layer 7 formed under these lamination conditions is approximately 0.
．． 2+am, the thickness of the laminate C is 5.5cm due to the secondary foaming of the cross-linked foam sheet, and its weight is 502g.
/%, and was extremely lightweight ■b. In addition, it was extremely inexpensive because it was mainly made of general-purpose resin, all of the materials were of the same type, and no adhesive was required.

Next, the results of tests conducted to investigate the characteristics of this example will be explained.

(A) Sample Sample 1: Extrusion laminate product (Example) Sample 2: Heat roll laminate product (Comparative Example 1) Sample 3: Three-layer coextrusion laminate product (Comparative Example 2) (Laminated structure of Al Comparative Examples 1 and 2 As shown in FIG. 4, non-foamed skin layers (a) and (c) are laminated on both sides of foam sheets 1-a, and one skin layer (C) is provided with an uneven pattern (d).

Foam sheet a is made of high-density polyethylene (density 0.955
, MFR6,0) 40 parts by weight, ethylene-butene-polypropylene copolymer (density 0°90, MFR8
, O1 melting point 142°C) 40 parts by weight, ethylene propylene block copolymer (density 0.90, M F R5
, 0, melting point 165° C.) is a closed-cell electron beam crosslinked foam sheet with a foaming ratio of 30 times and a thickness of 5.0 m11.

The non-foamed skin layer (b) is composed of polypropylene polymer having an MFR2, O1 melting point of 163°C, and has a wall thickness of 0.2
It is said to be 1.

(Manufacturing method for bl Comparative Examples 1 and 2 Comparative Example 1: Hot roll lamination method The foam sheet a made in advance and the skins Nb and c are laminated by pressure using a hot pressure roll. One skin layer C is An uneven pattern d is applied in advance.

The temperature of the above thermocompression roll is 150℃, and the take-up speed is 5.5
m/min ◇ Comparative Example 2: Three-layer co-extrusion lamination method The skins 1iib and c are simultaneously extruded and laminated on both sides of the foamed seal 1-a. One of the skin layers C is provided with an uneven pattern d at the same time during extrusion lamination.

The resin temperature of extrusion lamination 1 is 240℃, and the take-up speed is 6
m/min.

(B) Characteristics test (a) Formability test Samples 1 to 3 having an area of 2.2 d were heat-formed using a hot press molding machine and the molded ceiling was cut out. The defective rate after molding was investigated. Note that the heating conditions at this time were that the surface temperature of the sample was 140 to 145° C. as indicated by the heat label, and the heating time was 40 seconds. The test results are shown in Table 1.

Table 1 (b) Heating shrinkage rate test A reference line of predetermined dimensions is drawn on Samples 1 to 3 at room temperature. These samples are placed in a gear type aging tester set at a predetermined temperature, heated for a certain period of time, then allowed to cool, and the dimensions of the reference line are measured again.

Then, from this measurement result, the heat shrinkage rate of the sample was calculated using the following formula. The test results are shown in Table 2.

Heat Shrinkage Rate (%) Table 2 (Unit: %) The cross sections of the uneven pattern portions of Samples 1 to 3 after heat molding were observed. The observation results are shown below.

Sample 1.3: As shown in Figure 5, the thickness T of the skin layer 3, C
s was approximately 200μ and almost uniform throughout.

Sample 2: As shown in Fig. 6, the flesh J of the flat part of the epidermal layer C
! 1tTs is approximately 250μ, and the thickness Tsmin of the recess is 1
It was 35μ.

As shown in Table 1, in Sample 1, there was no waving phenomenon during hot molding, so the contact of the material to the mold during pressing was almost uniform, and there was no necking defect after molding. A good uneven pattern was formed without any wrinkles disappearing.Also, as shown in Table 2, the heating shrinkage rate under temperature conditions similar to the heating conditions for molding was uniform and slight shrinkage in both MD and TD. Furthermore, the skin layer 3 with the uneven pattern has a substantially uniform wall thickness Ts and does not become a starting point for necking, which is also the reason why necking defects do not occur. It is.

On the other hand, as shown in Table 1, sample 2 had many waving phenomena during hot molding, and nesoking defects after molding were 7.
It was extremely high at 0%. In other words, due to the waving phenomenon, the top of the wavy peaks and the bottom of the trough of the feed come into contact with the mold quickly during pressing, and while this part solidifies quickly, the uncontacted part is stretched, which is the cause of poor nesoking. It is estimated that this will continue to increase. In addition, the grain disappearing rate is extremely high at 90% (the grain has almost disappeared. Also, as shown in Table 2, the heat shrinkage rate under temperature conditions similar to the heating conditions for molding is that the MD shrinks. So, TD is slightly expanded,
The heat shrinkage rates of Ml) and TD were non-uniform. moreover,
When the film is formed with an uneven pattern, the difference in wall thickness is large, and when there are 1,000 parts of wall thickness, this becomes the starting point of the above-mentioned necking.

Further, as shown in Table 1, Sample 3 had a waving phenomenon during hot molding, although not in Sample 2, and the number of defects after molding was quite high at 30%.

This is presumed to be due to the same reason as in Sample 2 above. Furthermore, the wrinkle removal rate was quite high at 40%. Further, as shown in Table 2, as shown in the heating yield, Sample 1 was found to be superior to Sample 2.3 in both moldability and heat shrinkage. In particular, the reason why the heat shrinkage rate of Sample 1 is very small is as follows.

■The cross-linked foam sheet 5.6 generally has a large heat shrinkage rate, but if the thickness Ts of the non-foamed skin layer 2.3 is greater than the solid thickness Tf of the cross-linked foam sheet 5.6, N2
．． 3 is predominant, and the skin layer 2.3 with almost no distortion is formed by the extrusion lamination method.

■When laminating the skin N2.3 on the surface of the crosslinked foam sheet 5.6, heating has an annealing effect.

■Since the laminated foam sheet 1 is formed by overlapping the cross-linked foam sheets 5 and 6, their heat shrinkage rates are averaged, and the maximum value of the heat shrinkage rate is the veneer cross-linked foam sheets 1 to 6. is smaller than in the case of .

(2) A heat sealing layer 7 with a thickness of 0.11" or more is formed at the boundary of the crosslinked foam sheet 5.6.

(Effects of the Invention) As described in detail above, according to the method for manufacturing an automobile interior material of the present invention, particularly when large products such as automobile ceiling materials, door interior materials, trunk room mats, etc. require heat forming, Stable moldability can be ensured.

In other words, (1) a skin layer with almost no distortion is formed on the surface of the cross-linked foam sheet by the extrusion lamination method, which has excellent moldability and prevents warping and wrinkles of the molded product, and (2) the skin layer is formed on the surface of the cross-linked foam sheet. The heating during lamination has an annealing effect, and by stacking two cross-linked foam sheets to form a laminate, the heat shrinkage of the laminated foam sheets is averaged out as a whole, and ■A heat-sealing layer is formed at the boundary of the cross-linked foam sheet to suppress the distortion fixed during the production of the cross-linked foam sheet, resulting in a very low heat shrinkage rate during hot molding. Stable and reliable moldability can be obtained without defects or grain loss.

Moreover, the automobile interior shrine obtained by the above manufacturing method has various excellent effects as listed below.

Since the laminated foam sheet as a base material is constructed by laminating two crosslinked foam sheets made of propylene polymer and ethylene polymer, it is possible to reduce the weight of the automobile interior material itself and to provide sufficient It has impact resistance, rigidity, heat resistance, deep drawability, handling properties, heat insulation properties, soundproofing properties, etc.

The non-foamed skin layer made of propylene-based polymer that is laminated on both sides of the laminated foam sheet has good moldability, and the desired aesthetic appearance such as a deep and sharp aesthetic appearance can be obtained by thermoforming, making it aesthetically pleasing enough to be used as an interior material. , a soft feeling, etc. can be obtained.

The concavo-convex pattern, such as a squeeze pattern, provided on at least one of the skin layers further enhances the beauty, softness, etc. of the interior material.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of an automobile interior material according to an embodiment of the present invention, and FIGS. 2 and 3 are schematic process diagrams for explaining a method for manufacturing the same interior material. Figure 2 is an extrusion lamination process diagram, Figure 3 is a final lamination process diagram, Figure 4 is a cross-sectional view showing the structure of a comparative sample used in the characteristic test of the interior material, and Figures 5 and 6 are the diagrams used in the same test. Figure 5 shows the cross section of the concavo-convex pattern portion of +3, and Figure 5 shows that of sample 1.3, and Figure 6 shows that of sample 2. ■... Laminated foam sheet, 2, 3... Non-foamed skin layer, 4... Uneven pattern, 5, 6... Crosslinked foam sheet, 7
...Thermal adhesive layer, A, B...Laminate product Applicant Sekisui Chemical Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 1υ Figure 4

Claims (2)

[Claims] (1) A non-foamed skin layer made of a propylene polymer is extrusion laminated on one side of each of two cross-linked foam sheets made of a propylene polymer and an ethylene polymer to produce two laminated products. At the time of this extrusion lamination, an uneven pattern is simultaneously formed on at least one of the skin layers, and the surfaces of both the laminated products are faced to each other on their respective crosslinked foam sheet sides, and the surfaces are melted and pressed together. 1. A method for producing an interior material for an automobile, characterized in that a heat-sealing layer is formed on the interior material. (2) The ratio Ts/Tf of the solid thickness Tf of the cross-linked foam sheet to the thickness Ts of the non-foamed skin layer is 1 to 50, and the thickness T1 of the heat sealing layer is 0.1 to 50. 0.5 mm, and the wall thickness T1 is 1 to 2 of the wall thickness of the crosslinked foam sheet.
The method for manufacturing an automobile interior material according to claim 1, wherein the content is 5%.