JP3243275B2 - Adhesive structure of interior bonded parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interior laminated part in which a sheet material made of fiber reinforced resin and a skin material are integrally laminated by press molding, and more particularly to an improvement in the adhesive strength between the two parts to be laminated. It is about technology.

[0002]

2. Description of the Related Art Interior laminating parts are known in which a skin material is superimposed on a resinous sheet material, and they are formed by press molding and simultaneously laminated. Such an interior bonded part is lightweight, and has moderate rigidity and a beautiful appearance, and is therefore widely used as an interior member in a vehicle, a part of an indoor wall, a fitting, or the like. As the skin material, for example, a nonwoven fabric, a knitted fabric, a woven fabric, or a soft resin film such as a vinyl chloride film lined with the same is used.

On the other hand, as described above, for example, as described in JP-A-60-179234,
A fiber reinforced resin made of thermoplastic resin such as ABS, polyethylene, polypropylene, etc. added with reinforcing fiber with high elastic modulus such as glass fiber or aramid fiber, is compressed in advance into a state where the fibers in the resin bend and deform into a thin sheet. It has been considered to utilize the formed solidified sheet. That is, the solidified sheet has a small thickness and a high strength, so that it can be easily transported or stored. On the other hand, the thickness of the solidified sheet is 2 to 4 due to the internal reinforcing fibers being elastically restored by heating.
Since the sheet material expands about twice, the expanded material may be used as the sheet material. And when such a sheet material is superimposed on the skin material and press-formed,
At the same time as reducing the apparent specific gravity to reduce the weight, at the same time obtaining the physical properties required for interior bonding parts such as bending rigidity against load and surface elasticity when held down by hand, the thickness after molding must be Molding is performed in an incompletely compressed state that is about 1.5 to 3 times the thickness (substrate thickness) of the solidified sheet before expansion.

[0004]

However, in a relatively weak and incomplete compression state in the mold of the above-described degree,
Since mechanical bonding between the sheet material and the skin material due to fusion or intrusion of the material is not sufficiently performed, it has been difficult to secure a necessary bonding strength as an interior bonding part. On the other hand, for example, a hot-melt type adhesive film or the like is interposed between the sheet material and the skin material and press-formed so that a reliable bonding state can be obtained. However, when such an adhesive film is used, the number of steps for supplying the adhesive film between the sheet material and the skin material increases, and the work becomes complicated. Therefore, not only the material cost but also the manufacturing cost increases, and in addition, the molding cost increases. If there is a relatively complicated portion in the shape of the interior bonded part to be formed, the adhesive film cannot follow the shape change of that portion, and as a result, there is an inconvenience that uneven adhesion occurs.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a bonding method for an interior bonded part which can be provided with sufficient adhesive strength and can be easily and inexpensively implemented. It is to provide a structure.

[0006]

To achieve Means for Solving the Problems] Such objects may be partially simultaneously with the incomplete compression molding high compression molded into so as to adhere, the first invention is a high elastic modulus reinforced A skin material is superimposed on a sheet material obtained by heating and expanding a solidified sheet obtained by compressing and molding fibers in a thermoplastic resin, and the sheet material is formed in an incompletely compressed state by press molding, and the skin material is formed. Use of an intermediate adhesive layer in the bonded interior parts
Without both of the fused or iodine and their sheet material and skin material
An adhesive structure for firmly bonding at the time of the press molding by mechanical adhesion due to penetration of a material , wherein the sheet
Of the materials, the skin material is easily peeled or lifted. <br/> A predetermined specific portion is locally subjected to high compression molding by the press molding to be fixed to the skin material. . The second invention is the interior bonding section of the first invention.
In the bonding structure of the product, the specific location is the interior bonding
Are set at multiple locations on the part and
The high compression state of a specific location depends on the adhesive strength required for each location.
It is characterized by being set separately according to the degree
I do.

[0007]

In the above-described bonding structure of the interior bonded parts, the skin material of the sheet material is peeled off or floated.
Parts that tend to come up, such as edges in molded shapes
Unevenness in the shape of the part, the center part of the relatively wide flat part,
In some cases, the bottom or bulge of the recessed part when viewed from the skin material
The peripheral part of the waist is determined in advance at a specific location, and for example, the thickness at that location is set to be smaller than the standard thickness at other locations, so that it is locally pressed in a highly compressed state. Due to the molding, in the specific portion, mechanical adhesion due to fusion or intrusion of the material between the sheet material and the skin material occurs favorably, and both are integrally fixed, and the sheet material and the skin material are integrally fixed. and the skin material is Ru bonded to the firm.

As described above, according to the present invention, the sheet material is formed by high compression molding at a specific portion while securing desired physical properties such as rigidity and elasticity by low compression molding at the entire portion excluding the specific portion. Can be firmly adhered to the skin material, thereby effectively improving the adhesive strength of the interior bonded parts, while eliminating the need for an intermediate adhesive layer such as an adhesive film, thereby reducing the cost and improving the adhesion unevenness. Or worry about Moreover, the adhesive structure of the present invention can be configured by simple improvements such as setting the thickness dimension of a specific portion to be small, so that it can be implemented easily and inexpensively as compared with the case where an intermediate adhesive layer such as an adhesive film is used. Can be.

[0009] The adhesive strength between the sheet material and the skin material is determined for each part depending on how much the wall thickness is reduced and molded in a highly compressed state, or which part is determined as a specific part. Since it can be arbitrarily changed, for example, high compression of a plurality of specific portions as in the second invention
The condition is determined according to the adhesive strength required for each part.
By separately setting , compared to the case where the bonding means is taken as a whole including the part that does not need to increase the bonding strength,
It is possible to extremely effectively secure the substantial adhesive strength required for the interior bonded part.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a cross-sectional view of a vehicle interior bonding part 10 according to an embodiment to which the bonding structure of the present invention is applied. In the figure, an interior bonding part 10 is composed of a sheet material 12 made of fiber reinforced thermoplastic resin and a skin material 14 that covers the upper surface thereof in close contact with the surrounding step portion 16. The bottom plate portion 18 has a substantially flat shape with a depression. The sheet material 12 is made of a medium fiber (about 1/2 inch in length) of glass fiber as a reinforcing fiber by weight of 3%.
It is a sheet of a reinforced polypropylene resin containing 5 to 50%, and retains a predetermined shape by being molded to have physical component performance. On the other hand, skin material 1
No. 4 is made of a nonwoven fabric, a knitted fabric, a woven fabric, or a soft resin film such as a vinyl chloride film lined with the material, and has a surface property required for appearance.

More specifically, the sheet material 12 is completely compressed by being heated and cooled in a pressurized state until the glass fiber fibers previously mixed in the resin are bent and deformed, and the thickness thereof is increased. The solidified sheet (substrate) processed into a sheet shape at t ₀ is reheated in an unconstrained state, thereby recovering the deformation of the glass fiber fibers and expanding in the thickness direction. t
_The material having a thickness of 2 to 4 times the thickness of ₀ is compressed again by press molding until the general thickness t ₁ , which is a standard thickness dimension shown in the drawing, and molded together with the skin material 14. is there. The general thickness t ₁ is about 1.5 to 3 times the substrate thickness t ₀ , and is a thickness dimension capable of securing physical properties such as predetermined bending rigidity of the interior bonded part 10. As can be seen from the figure, a plurality of predetermined specific portions of the sheet material 12, that is, an edge portion 20 over the entire circumference of the interior bonding part 10, an intermediate portion 22 at the top of the step portion 16 (not all around), Bottom plate part 1
8, the central portion 24, and the bottom plate portion 18 to the step portion 16
At the base portion 28 (non-periphery) of the wall portion 26 rising up to the thickness of the sheet material 12 is equal to the general thickness t.
Has been smaller than _one . These specific portions are generally portions where the skin material 14 is easily peeled off or lifted up from the sheet material 12, and partially different molding conditions are used so that a more reliable bonding state can be obtained as compared with other portions. Is set. FIGS. 2, 3 and 4 show enlarged detailed views of the portions A, B and C in FIG. 1, respectively.

In FIG. 2, the thickness t ₂ of the sheet material 12 at the edge portion 20 is 0.5 t with respect to the substrate thickness t _0.
The size is set in the range of ₀ <t ₂ <1.5t ₀ , and it is molded in the highest compressed state of the whole. For this reason, the sheet material 12 and the skin material 14 in this portion are mechanically bonded by fusion or invasion of the material, that is, both resins are mixed and integrated in a molten state, and a gap between both fibers is formed. It is remarkable that the resin component of the other party enters and it is difficult to separate, and both are in a firmly bonded state. Thereby, the adhesive strength between the sheet material 12 and the skin material 14 is extremely increased at the edge portion 20.

In FIG. 3, the thickness t ₃ of the sheet material 12 in the intermediate section 22 is smaller than the substrate thickness t _{0 by} t ₀ <.
The thickness is set in the range of t ₃ <2t ₀ and the general thickness t ₁
It is molded in a relatively higher compression state than the part. Therefore, sufficient mechanical adhesion occurs between the sheet material 12 and the skin material 14 at this portion due to fusion or intrusion of the material, and the bonding state between the sheet material 12 and the skin material 14 is reliably obtained. The intermediate portion 22 has a predetermined adhesive strength higher than that of the general thickness t ₁ . Incidentally, the thickness dimensions in the central portion 24 is thicker t ₃ in the same manner as described above, conditions in that portion is the same as that described above.

In FIG. 4, a root 28 of the wall 26
The thickness t ₄ of the sheet material 12 is set in the range of t ₀ <t ₄ <2t ₀ with respect to the substrate thickness t ₀ , and in a compressed state relatively higher than the portion of the general thickness t _1. Is molded. For this reason, sufficient mechanical adhesion occurs between the sheet material 12 and the skin material 14 at this portion due to fusion or penetration of the material, and the sheet material 12 and the skin material 14
The adhesive strength between them is surely higher than that of the general thickness t ₁ .

FIG. 5 is a view showing a cross section of a press die 30 for molding the interior bonded part 10 and the sheet material 12 and the skin material 14 before molding. The press die 30 includes a pair of a lower die 32 and an upper die 34, and is disposed and used in a press device (not shown). The lower mold 32 is
Edge 20 of sheet material 12 in interior bonded part 10
Molding surface 36 for molding the intermediate part 22, the central part 2
4. A plurality of protrusions 3 for forming the root portions 28, respectively.
8 are provided at corresponding positions, and high compression molding is locally performed in these portions. An operation switch of the press device is supplied to the press mold 30 in a state where the sheet material 12 which has been heated and expanded in advance is supplied and the skin material 14 is supplied on the sheet material 12 in a superimposed manner. Is turned on, the upper mold 34 is moved to the lower mold 32.
, And the mold is closed until the gap between the upper mold 34 and the lower mold 32 reaches a predetermined size while deforming the sheet material 12 and the skin material 14 along the shape of the mold. An interior bonding component in which low-compression molding and partial high-compression molding are performed in the press mold 30, and the sheet material 12 and the skin material 14 are integrally adhered to each other by an adhesive structure in a predetermined adhesive state at the specific location. 10 is completed. The trimming of the edge portion 20 may be performed simultaneously with the molding, or may be performed in another step.

The interior laminated part 1 formed as described above
0 is a predetermined specific part of the sheet material 12, that is, the edge 2 around the entire circumference of the interior bonded part 10.
0, an intermediate portion 22 at the top of the step portion 16, a central portion 24 of the bottom plate portion 18, and a base portion 28 of a wall portion 26 rising from the bottom plate portion 18 to the step portion 16,
By wall thickness t ₂ at their _portions, t _3, t ₄ is set smaller than the general wall thickness t ₁ in the other points, the adhesive sheet material 12 is locally high compression molding by press molding Because of the structure, in the above-mentioned specific portion, good mechanical adhesion occurs between the sheet material 12 and the skin material 14 due to fusion or intrusion of the material, and both are integrally fixed, The adhesive strength between the sheet material 12 and the skin material 14 is partially increased at specific locations. For this reason, according to the present embodiment, a sufficient bonding state is ensured to prevent the skin material 14 from peeling off or floating from the sheet material 12, and the sheet material 12 and the skin material 14 are bonded to each other as in the related art. Adhesion unevenness does not occur due to an intermediate adhesive layer such as an adhesive film interposed therebetween. Moreover, the bonding structure of the present embodiment can be implemented easily and inexpensively as compared with the case where an adhesive film or the like is used, since it is only necessary to set the thickness of the portion where the bonding state is to be strengthened relatively small. .

The adhesive strength between the sheet material 12 and the skin material 14 depends on how much the wall thickness is reduced and how much the material is molded in a highly compressed state, or which part is determined as a specific portion. Since the setting can be arbitrarily changed, the setting is appropriately performed in accordance with the bonding strength for each part required in the interior bonded part 10, thereby increasing the bonding strength as in the case of using an adhesive film or the like. Compared to the case where the bonding means is entirely provided including the unnecessary part, the substantial bonding strength required for the interior bonded part 10 can be extremely effectively secured.

While the embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be embodied in other forms.

For example, in the above-described embodiment, the adhesive structure of the present invention is applied to the interior bonding part 10 for a vehicle. The bonding structure of the present invention can be similarly applied to a bonded part.

In the above-described embodiment, the sheet material 12 made of reinforced polypropylene resin in which the middle fiber of the glass fiber is added as the reinforcing fiber is bonded to the skin material 14 made of a nonwoven fabric or the like. But
Alternatively or in combination with these, when another different fiber such as carbon fiber or aramid fiber is added as the reinforcing fiber, another different resin such as ABS resin or polyethylene resin is used as the thermoplastic resin. Or when other interior laminated parts made of another material are molded, such as when a different skin material comprising a foam body such as urethane or olefin is used. There may be.

In the above-described embodiment, the sheet material 12 expanded to a thickness of 2 to 4 times the substrate thickness t ₀ of the solidified sheet before heating is formed by press molding to a thickness of the substrate thickness t ₀ .
It is compressed again until it has a general thickness t ₁ of 1.5 to 3 times, and is formed together with the skin material 14.
In more particular locations, there in the case of 0.5 t ₀ ~ 1.5 t wall thickness or _0, t ₀ ～2T thickness combined component 10 bonded decor is molded at a high compression state so that the dimension of the ₀ However, each of the above magnifications can be changed as appropriate, and the present invention can be implemented in accordance with the individual conditions of the interior bonded part.

Although not specifically exemplified, the present invention can be implemented in various modified and improved forms based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an interior bonded part which is an embodiment provided with an adhesive structure of the present invention.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is an enlarged view of a portion B in FIG.

FIG. 4 is an enlarged view of a portion C in FIG. 1;

5 is a diagram showing a cross section of a press die for molding the interior bonded part of FIG. 1, and a sheet material and a skin material before molding.

[Explanation of symbols]

 10: Interior bonding parts 12: Sheet material 14: Skin material 20: Edge part (specific part) 22: Middle part (specific part) 24: Central part (specific part) 28: Root part (specific part)

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshiro Umemoto 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (56) References JP-A-4-44822 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B29C 43/00-43/58 B29C 65/00-65/82

Claims (2)

(57) [Claims] 1. A skin material is superimposed on a sheet material obtained by heating and expanding a compression-molded solidified sheet in which reinforcing fibers having a high elastic modulus are mixed with a thermoplastic resin, and the sheet material is incompletely formed by press molding. in is and said surface skin material and the bonded decor laminating parts molded in a compressed state, medium
And said sheet material and said surface skin material without using between adhesive layers both
By mechanical bonding due to the fusion of
An adhesive structure for firmly bonding at the time of press molding, wherein the skin material of the sheet material is peeled or lifted
Predetermined specific places that are easy to
A bonding structure for an interior bonding part, wherein the bonding material is more locally locally compressed and fixed to the skin material. 2. The method according to claim 1, wherein the specific portion is a copy of the interior bonding part.
It is set in several places, and the multiple specific places
High compression state depends on the adhesive strength required for each part
Each is defined separately Claims characterized by the following:
2. The bonding structure of the interior bonded part according to 1.