JPS6032988Y2 - Automotive interior materials - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a novel interior material for automobiles.

More specifically, the present invention relates to an interior material for an automobile that has excellent heat resistance and does not lose its aesthetic appearance even when the temperature of the automobile's outer panel increases due to direct sunlight.

The headlining, sunroof, and other parts of automobiles become quite hot due to direct sunlight, so interior materials used in these parts are required to be heat resistant.

For example, for the interior material of the headlining section, 90℃
A heat resistance of 211 degrees is required.

On the other hand, conventional automotive interior materials are made by laminating in this order a core material such as hardboard, a pad material such as polyurethane foam, and a skin material such as polyvinyl chloride sheet, and then bonding them together by heat welding. something is known.

However, when such interior materials are used in high-temperature areas such as the headlining and sunroof areas, the polyurethane foam wrinkles noticeably, which is visible through the polyvinyl chloride sheet, which impairs its aesthetic appearance. There's a problem.

Conditions 1 to 4 where wrinkles occur in polyurethane foam
This will be explained with reference to the figures.

FIG. 1 is a schematic sectional view of an example of conventional interior materials, in which 1 is a hardboard, 2 is a polyurethane foam, and 3 is a polyvinyl chloride sheet.

The hardboard 1, polyurethane foam 2, and polyvinyl chloride sheet 3 are laminated in this order and bonded to each other by heat welding at desired locations.

4 is a heat welded part. When such an interior material is used for a headlining part, etc., when exposed to high temperatures, both the polyurethane foam 2 and the polyvinyl chloride sheet 3 sag as shown in FIG. Since the polyvinyl chloride sheet 3 and the polyvinyl chloride sheet 3 are in contact with each other on almost the entire surface, the plasticizer in the polyvinyl chloride sheet 3 transfers to the polyurethane foam 2.

Then, wrinkles 5 occur in the polyurethane foam 2 as shown in FIG. 3 due to the action of the transferred plasticizer.

The wrinkles 5 that have been generated are conspicuous in their drooping areas where the unevenness is severe and conspicuous.

As shown in FIG. 4, these wrinkles 5 remain even when the temperature reaches room temperature, and the wrinkles 5 that occur in the areas where the polyvinyl chloride sheet 3 is particularly sagging as described above are extremely uneven.
It will show through and spoil the aesthetics of the interior materials.

In order to solve the above problem, it is sufficient to prevent the polyurethane foam 2 from sagging to prevent severe wrinkles from occurring, and as a means to do so, the bird board 1, the polyurethane foam 2, and the polyvinyl chloride sheet 3 are used. Possible solutions include integrating by laminating or increasing the number of heat-welded parts.

However, integration through lamination is undesirable because it increases the number of steps and causes a significant increase in cost; - The increase in the number of force-free welded areas is limited by design (the pattern of heat-welded areas greatly affects the aesthetics of the interior material) ), cannot be increased by a large amount.

However, the present inventor proposed the above-mentioned integration using laminate,
As a result of intensive research to develop an automotive interior material that does not impair aesthetics by preventing wrinkles in padding materials such as polyurethane foam without adopting measures such as increasing the number of heat-welded parts, We have succeeded in developing a completely new automotive interior material.

That is, in the present invention, a core material, a polyurethane foam as a pad material, and an external plasticized polyvinyl chloride sheet as a skin material are laminated in this order, and these three members are bonded by heat welding at a predetermined interval. A heat-resistant interior material for an automobile, characterized in that a core material and a pad material are bonded to each other with a double-sided adhesive tape at a desired location of the non-thermal welded portion where the predetermined interval is a certain value or more. Regarding materials.

Next, the automotive interior material of the present invention will be explained with reference to the drawings.

5 and 6 are a plan view and a bottom view showing an embodiment of the interior material of the present invention, respectively, and FIG. 7 is a
- It is an X-ray sectional view.

In Figures 5 to 7, 6 is a core material such as a birdboard, 7
8 is a pad material made of polyurethane foam, and 8 is a skin material made of an external plasticized polyvinyl chloride sheet.

The core material 6, pad material 7, and skin material 8 are laminated in this order and bonded to each other by heat welding at desired locations.

9 is a heat welded part. The core material 6 and the pad material 7 are further bonded to each other with a double-sided adhesive tape 10 at a desired location other than the heat-welded portion 9.

The peripheral edge of the skin material 8 is folded back and fixed to the core material 6 using fastening means 11 such as a tacker.

Even when the automobile interior material of the present invention having the above-mentioned structure is used for a headlining part, a sunroof part, etc., the pad material does not suffer from severe unevenness and wrinkles, unlike conventional interior materials.

In other words, in the case of the interior material of the present invention, since the pad material 7 in the area where there is a risk of drooping greatly in the heat is bonded to the core material 6 with the double-sided adhesive tape 10, as shown in FIG. At times, the pad material 7 hardly sags, but the skin material 8 made of a polyvinyl chloride sheet sags. There is almost no transfer of plasticizer from the skin material 8 made of a sheet to the pad material 7, and as a result, the occurrence of severe wrinkles with unevenness is prevented, and the initial aesthetic appearance is maintained almost as is.

In this way, the present invention achieves prevention of wrinkles in the pad material 7 by a very simple means of binding the pad material 7 to the core material 6 with the double-sided adhesive tape 10. Compared to the case where the skin material 8 is integrated by lamination, manufacturing is simpler and the cost is lower, and the pattern of the heat-welded portion can be determined almost solely from a design point of view.

Furthermore, by using double-sided adhesive tape, there is no problem of flammability or toxicity because no solvent is used, and since it is in tape form, there is no problem of odor or staining that occurs when using liquid adhesive, and it is easy to bond evenly. Benefits include excellent impact resistance.

The core material 6 used in the present invention is particularly suitable as long as it has enough rigidity to not bend even when the interior material is suspended in the air and can bond the pad material 7 and the skin material 8 by heat welding. Examples include, but are not limited to, birdboard, particleboard, plywood, plastic honeycomb board, and the like.

In particular, a bird board is preferably used.

The thickness of the core material 6 is usually about 1.5 to 3.5 mm.

As the pad material 7, polyurethane foam is used.

The polyurethane foam used is one blended with or impregnated with a thermoplastic resin to enable thermal welding.

The thickness of the pad material 7 is usually about 2 to 5 m.

As the skin material 8, an externally plasticized polyvinyl chloride sheet is used, which is advantageous in various aspects such as being capable of high-frequency welding, and this polyvinyl chloride sheet may be made into a leather by embossing or the like.

The thickness of the skin material 8 is usually about 0.2 to 0.4x.

The double-sided adhesive tape 10 used in the present invention is a concept that includes both ordinary double-sided adhesive tape and double-sided adhesive tape, and double-sided adhesive tape is particularly preferably used.

Examples of double-sided adhesive tapes include tapes in which adhesive layers such as acrylic adhesive are provided on both sides of a rayon-based nonwoven fabric.

In the interior material of the present invention, double-sided adhesive tape 1 is attached to the desired location of the core material 6.
0, overlaying the pad material 7 and binding it to the core material 6, further overlaying the skin material 8, and then thermally welding the desired parts.

The peripheral edge of the skin material 8 is folded back to the back side and fixed to the core material 6 by fastening means 11 such as a tacker.

The thermal welding may be carried out by a conventional thermal welding method such as a high frequency welding method, an ultrasonic welding method, or a welding method using a heating device.

The location where the double-sided adhesive tape 10 is bonded is not particularly limited as long as the pad material 7 is prevented from sagging significantly.

The pattern of the heat welded portion 9 may be determined mainly from the viewpoint of design.

In the interior material of the present invention as well, the skin material 8 sags to some extent when it gets hot, but it returns to its original shape once the temperature returns to normal, so there is no particular problem.

However, if the sagging is severe, double-sided adhesive tape 10
It may also be bound to the pad material 7 with.

As mentioned above, the interior material of the present invention is suitably applied to headlining parts, sunroof parts, etc., but it can also be applied to door trim parts, etc.

[Brief explanation of the drawing]

Figures 1 to 4 are schematic sectional views sequentially showing the states in which wrinkles occur in conventional interior materials for automobiles, and Figures 5 to 6 are plan and bottom views, respectively, showing one embodiment of the interior material for automobiles of the present invention. , FIG. 7 is a schematic enlarged sectional view taken along the line X--X of FIGS. 5 and 6, and FIG. 8 is a schematic sectional view showing the state of the automotive interior material of the present invention when heated. Main symbols in the drawing, 6...Core material, 7...
Pad material, 8...Skin material, 9...Heat welding part, 10...Double-sided adhesive tape.

Claims (1)

[Scope of utility model registration request] In an automobile interior material, a core material, a polyurethane foam as a pad material, and an external plasticized polyvinyl chloride sheet as a skin material are laminated in this order, and these three members are bonded by heat welding at a predetermined interval. . A heat-resistant interior material for an automobile, characterized in that a core material and a pad material are bonded to each other with a double-sided adhesive tape at a desired location of the non-thermal welded portion where the predetermined interval is a certain value or more.