JPS5940096B2 - Curved panel for interior - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to interior materials for vehicles, ships, aircraft, etc., and more specifically, the present invention relates to interior materials for lining vehicles, etc., for the purposes of heat insulation, shock mitigation, sound absorption, decoration, etc. Regarding the curved panel used.

A case in which the curved panel of the present invention is used particularly for lining the ceiling of an automobile will be explained.

Conventionally, the interior lining of the ceiling of an automobile is made by pasting an elastic sheet such as urethane foam to the outer panel of the ceiling, and then covering the surface with cloth, synthetic leather, or the like. Since such interior materials lack shape retention, they cannot be independently mass-produced outside the automobile assembly line, and their installation has been done manually on the assembly line. This work requires a high level of skill and has become a bottleneck in streamlining the automobile production line, and improvements have been desired. Therefore, in recent years, various types of interior materials for ceilings that have shape-retentive properties have been proposed. Among these, curved panels made of plastic cardboard as a base material and laminated with plastic foam, skin material, etc. as appropriate are lightweight, have cushioning properties, and have shape retention properties, so they are suitable for inset ceilings. It is considered to be a promising interior material. In general, plastic cardboard can be made to have any rigidity by adjusting the thickness of both the upper and lower flat plates and/or the number, shape, thickness, etc. of ribs, but when used as interior material for ceilings, If the rigidity is too high, the cushioning performance will be poor and the total weight of the curved panel will be heavy, which is disadvantageous in terms of cost and installation work. In addition, when attaching a curved panel to the ceiling panel, the usual method is to bend the panel once, insert it into the car through the window, and then fix it. However, if the rigidity of the plastic cardboard is too high, the curved panel may bend. It becomes difficult to Therefore, it is considered preferable to use plastic cardboard poles with low rigidity, but on the other hand, when plastic cardboard poles with low rigidity are used, they tend to flex, so when attached to the car body, they may sag due to their own weight and cause problems in the interior space of the car. There are disadvantages such as a smaller volume and poor shape retention, resulting in poor workability during installation. An object of the present invention is to provide a curved interior panel made of plastic cardboard, which has good shape retention, less sag due to its own weight, excellent cushioning properties, is lightweight, and easy to install. The present inventors have discovered that the above object can be achieved by using a specific plastic cardboard. That is, the present invention provides a curved interior panel made of plastic cardboard as a base material and laminated with a skin material, etc. as appropriate on the base material. Using cardboard with different bending buckling strengths in different directions,
A curved panel for interior use is characterized in that the panel is curved in a direction in which the buckling strength of the tamboard is weaker.

The present invention will be explained in detail.

Plastic cardboard in the present invention refers to polyolefins such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene monovinyl acetate copolymer, polystyrene, styrenic resins such as ABS resin,
The material is made of plastic such as nylon, polyester, or polyoxymethylene, and a combination of these with organic or inorganic fillers, organic or inorganic fibers, etc., as required, and ribs or embossing of an appropriate shape are placed between the upper and lower two flat plates. It refers to a structure that has shape-retentive properties and has spaces formed with uneven sheets, corrugated plates, etc. The curved panel for interior use of the present invention is made of plastic cardboard as a base material, and in particular, the present invention uses plastic cardboard that has different buckling strength in vertically upward bending and downward bending than flat cardboard plates. .

What is a plastic cardboard pole that can meet these requirements?
Both upper and lower flat plate surfaces of plastic cardboard
When divided into veneers, each veneer (including rib structure)
They have different bending rigidities, and specifically, the following configurations can be considered, for example. (1) Those with a structure in which the upper and lower flat plates have different thicknesses (Fig. 1 1 to 4 1)
.

(2) The upper and lower flat plates are made of different materials.

(3) The number and/or thickness of ribs differs on the upper and lower sides (Fig. 5, 1).

(4) In a structure in which an embossed uneven sheet is sandwiched between two upper and lower flat plates, the total area of the concave surface portion of the embossed sheet is different from the total area of the convex surface portion (Fig. 6 1).

In the plastic cardboard having the above structure, the bending buckling strength is higher when the cardboard is bent toward the flat plate side, which has higher bending rigidity, than when it is bent toward the flat plate side, which has lower bending rigidity.

For example, in a plastic cardboard pole in which the upper flat plate 1a is thicker than the lower flat plate 1a as shown in FIGS. 1 to 4, the lower flat plate 1c is bent toward the upper flat plate 1a.
Less likely to buckle than when bent to the side. Automotive ceiling interior panels are rarely used as flat plates, and most are vacuum formed, pressure formed, or
It is used after being subjected to secondary processing such as pressure molding.

The curved panel for interior use of the present invention is characterized by using plastic cardboard as a base material, which has different buckling strength in vertically upward bending and downward bending of the flat cardboard plate, and This is because the Danpole is curved in the direction of its weaker buckling strength. That is, in manufacturing the panel of the present invention (in this case, it is important to process the curved surface in the above direction, and only in this way can an interior panel with less sagging be obtained. When the curved panel of the invention is attached to the ceiling panel of an automobile, a force is applied to the panel in a vertically downward direction using its fixed part as a fulcrum.This force is applied to the upper flat plate of the plastic cardboard pole of the panel. acts as a compressive force and as a tensile force on the lower flat plate.In such a case, the ease with which the cardboard sag depends largely on the rigidity of the side being compressed.It should be noted that the plastic cardboard has a low buckling strength. In other words, a panel that is curved in a direction is a curved panel in which the flat plate on the side of the plastic cardboard pole with higher bending rigidity is located on the outside of the curved surface than the flat plate on the side with lower bending rigidity. In the case of plastic cardboard having two flat plates (upper and lower) with different wall thicknesses, the thicker flat plate of the cardboard is on the outside of the curved surface.The curved interior panel of the present invention uses plastic cardboard as a base material, and It is made by appropriately laminating a skin material, an elastic sheet, etc.

Here, the elastic sheet includes, for example, polyethylene foam, polypropylene foam, vinyl chloride foam,
polystyrene foam, urethane foam, foam rubber,
Plastic foams such as phenol foam and ABS foam, natural or synthetic rubber sheets, and sheets with cushioning properties such as felt are used as surface materials.Woven fabrics, nonwoven fabrics, and synthetic leather are well known as skin materials.

Nonwoven fabrics are made of polyethylene, polypropylene, polyamide, polyacrylonitrile, polyester, and polyurethane, and are made by bonding various filaments made by melt-spinning, flat-spinning, etc., by bonding, fusing, etc.
And/or it is provided as a nonwoven fabric by processing such as needle punching. Synthetic leather is made by embossing or foaming a sheet of soft vinyl chloride resin or soft polyolefin to give it a feel and/or appearance similar to leather. Examples of the structure of the curved interior panel of the present invention include a two-layer structure of skin material/plastic cardboard, a three-layer structure of skin material/elastic sheet/plastic cardboard, and a three-layer structure of skin material/plastic cardboard/elastic sheet. Skin material/
Examples include a four-layer structure of elastic sheet/plastic cardboard/elastic sheet. Of course, the curved panel of the present invention is not limited to the above configuration,
Furthermore, between each layer (adhesive layer, various plastic films,
Also includes those with glass wool, metal mesh, plastic mesh, etc. In order to form an interior panel into a curved surface according to the present invention, the above components may be laminated and then subjected to secondary processing into a curved surface, or the lamination and curved surface processing may be performed simultaneously. The interior curved panel of the present invention as described above has effects such as excellent cushioning properties and shape retention properties despite being lightweight, and excellent installation workability when attached to a vehicle body or the like.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIGS. 1 to 6 are cross-sectional views. Moreover, FIG. 7 is a perspective view. 1...Plastic cardboard, 1a, 1c...Plastic flat plate, 15-...Empos uneven sheet, 2...
...Elastic sheet, 3...Skin material.

Claims (1)

[Claims] 1. A curved interior panel made of plastic cardboard as a base material and laminated with a skin material, etc. as appropriate on the base material,
As the plastic cardboard, cardboard is used which has different vertically upward bending buckling strength and downward bending buckling strength, and the panel is processed into a curved shape in the direction where the bending buckling strength of the cardboard is weaker. A curved panel for interior use that is characterized by: 2. The panel according to claim 1, wherein the plastic cardboard has a structure in which an embossed uneven sheet is sandwiched between two upper and lower flat plates. 3. The panel according to claim 1, wherein the plastic cardboard having different bending buckling strengths in the vertical direction is a plastic cardboard whose upper and lower flat plates have different thicknesses. 4. The panel according to claim 1, wherein the plastic cardboard having different bending buckling strengths in the vertical direction is a plastic cardboard whose upper and lower flat plates are made of different materials. 5. The panel according to claim 1, wherein the plastic cardboard having different bending buckling strengths in the vertical direction is a plastic cardboard in which the number and/or thickness of ribs differs in the upper and lower parts. 6. The panel according to claim 2, wherein the plastic cardboards having different bending buckling strengths in the vertical direction are plastic cardboards in which the total area of concave portions and the total area of convex portions of the embossed sheets are different. . 7. The panel according to claim 1, characterized in that the panel is for interior use in automobiles. 8. The panel according to claim 7, characterized in that the panel is used for the interior of an automobile ceiling.