JPS5816850Y2 - laminate board - Google Patents

Description

[Detailed description of the invention] This project relates to the improvement of fabric skin laminates (composite), which are often used as interior panels for automobiles (ceiling lining panels, door trim boards, etc.), architectural interior panels, decorative panels, etc. The purpose is to provide sound absorption properties.

The fabric skin laminate is a board 1 that is lightweight and has appropriate rigidity, such as a resin felt board, a pressed glass fiber board, a so-called corrugated cardboard structure board made of a synthetic resin sheet (example shown), or a relatively hard resin foam. Use a body plate, etc., and apply urethane foam or the like to an appropriate thickness, e.g.
It is made by sequentially pasting together a cushioning material layer 2 (8 mm) and a fabric skin layer 3 made of fiber such as woven fabric, knitted fabric, or felt.
The interior of the car can be decorated elegantly and luxuriously due to its solid taste and good feel.

By the way, one of the characteristics that the interior panels of motor vehicles and the like should have is that they should have good sound absorbing properties, but the above-mentioned conventional fabric skin laminates cannot be said to have excellent sound absorbing properties.

In the graph of Fig. 2, curve A indicates that a urethane foam sheet with a thickness of about 5 mm is pasted on the substrate 1 as the cushion material layer 2, and on top of that a urethane foam sheet with a thickness of about 5 mm is made of 6-6 nylon as the fabric skin 3. This figure shows the results of a normal incidence sound absorption test of a laminate (Fig. 4) to which 200g/m2) was attached.

That is, all of them exhibited a sound absorption coefficient of only about 20% for various frequency sound waves, indicating that they have low sound absorption properties.

This is because the fabric skin layer 3 and the cushioning material layer 2 themselves have a small ability to attenuate the sound waves that have entered (sound absorption), and therefore the incident sound wave a (fourth Figure) shows that the sound pressure is hardly weakened during the process of progressing through the layers 3 and 2, and the substrate 1
reaches the surface and is reflected.

This is considered to be because the reflected sound wave a' travels backward through the layers 2 and 3 and exits the laminate again without having its sound pressure weakened.

This proposal is based on the above-mentioned substrate 1. The purpose of this is to improve sound absorption in a laminate consisting of a cushioning material layer 2 and a fabric skin layer 3, and as shown in FIG. The fabric skin layer 3 is made of a resin corrugated cardboard structure board, and sound absorption holes 15 are formed on the surface of the board to which the cushioning material layer is bonded, corresponding to the individual internal recesses 12 and communicating with the recesses 12. The gist is that the material layer 2 is bonded to the material layer 2 via the film layer 4 in which numerous small holes 41 are formed.

Specifically, the substrate 1 of the example laminate shown in the figure has a thickness of about 9.3 mm.
A number of small circular recesses 12 with a diameter of about 7 mm and a depth of about 4 mm are vacuum-formed on the surface of a semi-rigid polypropylene resin sheet 11 with a distribution density of about 3 mm between adjacent recesses, and a thickness of about Q is formed on both sides. A corrugated resin cardboard structure board (damper plastic) is constructed by laminating 3 mm semi-rigid polypropylene resin sheets 13 and 14, and the cushioning material layer laminated surface sheet 13 of the board is made to correspond to each internal recess 12 in advance. A sound absorbing hole 15 with a diameter of about 1 mm is formed to communicate with the recess.

Further, the cushioning material layer 2 and the film layer 4 have a thickness of about 5 mm,
A thin vinyl chloride film 4 with a thickness of about 0.25 mm is laminated on one side of the urethane foam sheet 2 with a ratio of about 0.03, and a thin vinyl chloride film 4 with a diameter of about 1 mm is passed through the film 4 and the foam sheet 2 in the thickness direction. Small 7L41,41' formed in large numbers at a distribution density of approximately 2 pieces/cm2 (opening ratio 2.8%)
was attached to the hole-treated surface of the substrate 1 with the film layer 4 side facing upward.

The fabric skin 3 was laminated with a 6-6 nylon French pile cloth (trade name: 200 g, 7 m2).

The film layer 4 may be a thin film such as a synthetic resin film such as vinyl chloride, paper, or metal foil with a thickness of 0.05 to Q and about 3 mm, and the diameter of the small holes 41 to be formed is generally 0.05 to 3 mm. They may be formed with a thickness of about 5 to 2 mm and a distribution density of about 1 to 5 pieces/C♂.

The film layer 4 has a large number of small holes 41 with a desired hole diameter and density in advance.
It is also possible to sequentially laminate and integrate the substrate 1 → cushion material layer 2 → the film 4 → fabric skin layer 3 in the order of 1. However, since the film layer 4 is thin and difficult to handle, it is difficult to handle the film layer 4. A film 4 that has not been used is laminated in advance on the surface of the cushion material layer 2 to which the fabric skin layer is bonded, and the film 4 and the cushion material 2 are penetrated through the film 4 and the cushion material 2 in the thickness direction of the film laminated cushion material to form the desired pore diameter 9 and the number of distribution densities. Multiple small holes 41 and 41'(41' is a small hole through the cushion material) are formed.

Then, the film laminate cushion materials 4 and 2 which have been subjected to the perforation process as described above are laminated to the substrate 1, and then the fabric skin layer 3 is sequentially laminated to obtain the laminated material of the present invention.

In this case, as described above, the fabric skin layer 3 is bonded to the cushion material layer 2 via the film layer 4 in which numerous small holes 41 are formed. The generated sound waves a (FIG. 3) enter the cushioning material layer 2 through the small holes 41 of the layer 3→film layer 4, strike the surface of the substrate 1, and are reflected a'.

Further, a portion of the incoming sound waves further enters into each of the four independent internal portions 12 of the substrate 1 through the small holes 15 of the substrate 1 a''.

A part of the reflected sound wave a' passes back through the hole 41 of the film layer 4 → the fabric skin layer 3 and exits the laminate, but most of the other reflected sound wave a' passes through the inner surface of the film layer 4. By hitting the non-porous part of the fabric, release to the fabric skin layer 3 side is prevented.

That is, most of the reflected sound waves a' are trapped in the cushion layer 2 between the film layer 4 and the surface of the substrate 1 and are attenuated.

Furthermore, the sound waves a'' that have entered each of the four independent portions 12 of the substrate 1 are also trapped in the recesses 12 and are attenuated as they exit to the outside.

As a result, the laminate of the present invention exhibits an extremely high sound absorption coefficient.

Specifically, the above-mentioned example 1. When a normal incidence sound absorption test was conducted on the laminate having the structure shown in the example, the results showed the curve shown in the graph of FIG.

That is, compared to the conventional product A mentioned above, the sound absorption coefficients of various frequency sound waves were greatly improved.

Here, the sound-absorbing holes 15 communicating with each of the four independent internal parts 12 are not formed in the corrugated cardboard structure plate spanning the substrate, and the fabric skin 3 is attached to the cushioning material layer 2 through the film 4 in which numerous small holes 41 are formed. Although it is possible to obtain a fairly excellent sound absorption effect by simply bonding the substrate 1 to a structure as shown by the curved line in the graph in Figure 2, as in the present case, the substrate 1 is further bonded to a number of independent By using a synthetic resin corrugated cardboard structural board having internal recesses 12 and forming sound absorption holes 15 that communicate with the recesses 12 in correspondence with the individual internal recesses 12 on the surface of the board to which the cushioning material layer is bonded, the sound absorbing holes 15 can be made even more effective than a curved opening. Excellent sound absorption effect can be obtained.

Furthermore, since the substrate 1 is made of a synthetic resin corrugated board structure, it is possible to obtain a highly sound-absorbing laminate that is overall lightweight, has high rigidity, and has good moldability.

Since the film layer 4 only needs to be thin, the original feel of this type of laminate is not impaired in any way.

Therefore, the intended purpose has been well achieved and it is effective and suitable as a highly sound-absorbing fabric skin laminate used as an automobile interior panel, etc.

Both sides of a semi-rigid polypropylene resin sheet 11 with a thickness of about Q and 3 mm, in which numerous small circular recesses 12 with a diameter of about 7 mm and a depth of about 4 mm are vacuum-formed with a distribution density of about 3 mm between adjacent recesses. A synthetic resin corrugated cardboard structural board (damper plastic) made by laminating semi-rigid polypropylene resin sheets 13°14 with a thickness of approximately Q and 3 mm.

(2) Cushion material layer 2 and film layer 4 thickness approximately 5 mm
- A thin vinyl chloride film 4 with a thickness of about 0.25 mm is laminated on one side of the urethane foam sheet 2 with a specific gravity of about 0.03, and a thin vinyl chloride film 4 with a diameter of about 1 mm is passed through the film 4 and the foam sheet 2 in the thickness direction. A large number of small holes 41.41' are formed at a distributed density of 2 ladles/cIT12 (opening ratio 2.
8%).

□-□ (3) Fabric skin 6-6 Nylon product name French pile cloth (Weight 20
0 g 7m2) The cushioning material 2 of (2) was bonded to the substrate 1 of (1) above with the film laminate side facing up, and the fabric skin of (3) was bonded to the film laminate surface as shown in Figure 1. A laminate according to the present invention having the following configuration was manufactured.

When a normal incidence sound absorption test was conducted on the laminate, the curved line in the graph of FIG. 2 was obtained.

That is, compared to curve A of the conventional product mentioned above, the sound absorption coefficients of various frequency sound waves were greatly improved.

In particular, in the actual height measurement, the sound absorption coefficient for sound waves with a frequency of 2 KHz or higher was dramatically improved.

Further, in the above-mentioned laminate, sound absorption holes 15 having a diameter of about 1 mm and communicating with the recesses are formed in advance in the cushioning material bonded face sheet 13 of the substrate 1 in correspondence with the respective internal recesses 12. When we conducted a normal incidence sound absorption test, we obtained the results shown in curve C in the graph of Figure 2.

That is, when the substrate 1 was made to have a structure with sound absorption holes, the sound absorption coefficient for frequency sound waves in the range of 1 to 3.15 KHz was further improved in the actual height measurement.

As described above, the present invention has a film layer 4 in which numerous small holes 41 are formed between the cushioning material layer 2 and the fabric skin layer 3.
With a simple structure that only requires the interposition of a fabric skin laminate, the sound absorption coefficient of the fabric skin laminate, which has conventionally had poor sound absorption coefficient, can be greatly improved, and the intended purpose is well achieved.

Moreover, since the film layer 4 only needs to be thin, it does not impair the feel of this type of laminate.

[Brief explanation of the drawing]

FIG. 1 is a perspective view illustrating the layer structure of an example of the laminate according to the present invention;
Fig. 2 is a sound absorption coefficient measurement graph, Fig. 3 is a diagram illustrating the sound absorption principle of the laminate according to the present invention, and Fig. 4 is a diagram illustrating the sound wave reflection of the conventional laminate. 15 is a sound absorption hole provided in the substrate 1, a is an incident sound wave, and a' is a reflected sound wave.

Claims (1)

[Claims for Utility Model Registration] In a laminated board formed by laminating a substrate, a cushioning material layer 2 and a fabric skin layer 3 in this order, the substrate 1 is made of a composite resin having a large number of independent internal recesses 1 and 3. It is a corrugated cardboard structure board, and sound absorption holes 15 are formed in the surface of the board to which the cushioning material layer is bonded, corresponding to the individual internal recesses 12 and communicating with the recesses 12, and the fabric skin layer 3 has a large number of small holes 41. A laminate, characterized in that the laminate is bonded to a cushioning material layer 2 via a film layer 4 formed thereon.