JP7109714B2 - Method for manufacturing sound absorbing member - Google Patents

Description

The present invention relates to a sound absorbing member that absorbs sound.

Sound absorbing and/or insulating materials have been developed to reduce noise and increase indoor quietness. For example, Patent Document 1 discloses a flexible soundproof/sound-absorbing sheet in which a pack containing a sound-absorbing material is arranged between a soundproof sheet and a mesh sheet. In Patent Document 1, a granular porous material is used as the sound absorbing material.

JP-A-2009-235761

The inventors have studied how to manufacture a sound absorbing member at low cost. The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce the manufacturing cost of sound absorbing members.

According to the present invention, a member made of a flexible resin and having a plurality of mutually partitioned hollow portions;
a granular composition housed in the plurality of hollow portions;
with
The granular composition is a mixture of paper or pulp and a flexible resin,
The member is
a sheet-like first member having a plurality of recesses;
a sheet-like second member that seals the plurality of recesses;
and
A sound absorbing member is provided in which the hollow portion is a region surrounded by the recess and the second member.

According to the present invention, it is possible to reduce the manufacturing cost of the sound absorbing member.

It is a top view of the sound-absorbing member concerning an embodiment. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in all the drawings, the same constituent elements are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

FIG. 1 is a plan view of a sound absorbing member 10 according to an embodiment. FIG. 2 is a cross-sectional view taken along line AA of FIG. Sound absorbing member 10 comprises member 100 and particulate composition 200 . The member 100 is made of flexible resin and has a plurality of hollow portions 130 partitioned from each other. The granular composition 200 is accommodated in each of the plurality of hollow portions 130, and is kneaded with paper or pulp and flexible resin. The sound absorbing member 10 will be described in detail below.

As shown in FIG. 2, member 100 has first member 110 and second member 120 . The first member 110 is a sheet-like member and has a plurality of recesses 112 . The second member 120 is also a sheet-like member and seals the recess 112 . One second member 120 may be attached to the entire surface of the first member 110 , or the second members 120 may be individually attached to each of the plurality of recesses 112 .

Specifically, both the first member 110 and the second member 120 are formed using a resin film. This resin film is formed using, for example, polypropylene, polystyrene, and PET, but may be formed using other resins. The recess 112 of the first member 110 is formed using a vacuum forming method. First member 110 may have a region of the same thickness as second member 120 . This region is, for example, the region between two adjacent recesses 112 . In this case, since the same resin film as that of the second member 120 can be used as the material of the first member 110, the manufacturing cost of the sound absorbing member 10 can be reduced. However, the first member 110 may be thinner than the second member 120 or thicker than the second member 120 .

Second member 120 is fixed to region 114 of first member 110 where recess 112 is not formed. As this fixing method, there are a method using an adhesive agent, welding, and the like. A hollow portion 130 is formed by fixing the second member 120 to the first member 110 . In other words, hollow portion 130 is a region surrounded by recess 112 and second member 120 .
Moreover, it is preferable that the portion where the second member 120 and the first member 110 are fixed to each other surrounds the concave portion 112 without a gap. By doing so, it is possible to prevent moisture and foreign matter from entering the concave portion 112 through the gap between the first member 110 and the second member 120 .

A plurality of granular compositions 200 are positioned in the plurality of hollow portions 130 . Granular composition 200 functions as a sound absorber. The granular composition 200 is, as described above, kneaded with paper or pulp and flexible resin, and is produced, for example, as follows. In this manufacturing method, wallpaper or waste wallpaper (hereinafter referred to as wallpaper) is used as the paper or pulp. However, other materials may be used as paper or pulp.

First, prepare wallpaper as a raw material. Wallpaper scraps are generated, for example, when buildings are dismantled, renovated, wallpaper is applied, and wallpaper is manufactured in factories. In recent years, there are wallpapers made mainly of paper (paper-based wallpapers), wallpapers made mainly of organic fibers (fiber-based wallpapers), and paper with a decorative surface layer made of thermoplastic resin such as vinyl chloride. There are those provided on the surface of paper (vinyl chloride resin wallpaper and plastic wallpaper). In this embodiment, these may be used as raw materials without being separated, or only specific substances may be used. When using a specific one, for example, at least one of vinyl chloride resin-based wallpaper and plastic-based wallpaper is suitable. The wallpaper, which is a raw material, preferably contains 25% to 35% by weight of paper or pulp and 25% to 35% by weight of thermoplastic resin. Then, if necessary, the wallpaper is pulverized using a pulverizer.

Next, the prepared wallpaper and a thermoplastic resin (for example, a soft resin) are placed in an apparatus having a kneading function, such as a vented twin-screw extruder, and kneaded while being heated. The resin added during kneading is the resin most contained in the raw material wallpaper, such as vinyl chloride, but is not limited to this. Moreover, the amount of the resin to be added is, for example, 5% or more and 15% or less of the wallpaper. Moreover, the wallpaper may be 80% by weight or more and 95% by weight or less of the whole, and the added resin may be 5% by weight or more and 20% by weight or less of the whole, and the total may be 100% by weight or less. During this kneading, the kneaded material is heated to a temperature higher than the glass transition temperature of the resin contained in the kneaded material.

After the wallpaper and the resin are sufficiently kneaded, they are molded into granules and cooled to below the glass transition point of the resin, for example, room temperature. This shaping and cooling are performed using, for example, a hot-melt crusher. Thus, the composition according to the embodiment is produced. It should be noted that the granules in the present embodiment include pellets and flakes. Also, the composition is preferably passed through a mesh of a predetermined size, for example, a mesh of 8φ.

This composition has a high resin content compared to the composition of wallpaper as a raw material. Specifically, the composition contains 25% to 35% by weight of pulp or paper and 35% to 45% by weight of thermoplastic resin. Further, the specific gravity is 1.4 g/cm3 or more and 1.7 g/cm3 or less. The composition then contains paper or pulp and is well kneaded during manufacture. Therefore, this composition is suitable as a sound absorbing material.

In this embodiment, at least the first member 110 of the member 100 is formed with a dividing line 12 . The dividing line 12 is preferably provided on both the first member 110 and the second member 120 . The division lines 12 are perforations, for example, and are provided to divide the member 100 into a plurality of parts.

The dividing lines 12 extend along the hollow portions 130 in portions that do not overlap with the hollow portions 130 , that is, between adjacent hollow portions 130 . In the example shown in FIG. 1, the plurality of hollow portions 130 are arranged in a grid pattern. The dividing line 12 extends between the hollow portions 130 . In other words, in the member 100, a plurality of dividing lines 12 extend in a first direction (vertical direction in FIG. 1) and a second direction (horizontal direction in FIG. 1). That is, the member 100 is divided into a plurality of rectangular regions by a plurality of dividing lines 12. As shown in FIG. A hollow portion 130 is provided in each of the plurality of rectangular regions.

By providing the dividing line 12, the user can cut the sound absorbing member 10 along the dividing line 12 to make the sound absorbing member 10 the required size. Note that the dividing line 12 may not be provided on the sound absorbing member 10 . In this case, the user may divide the sound absorbing member 10 into required sizes using scissors or a cutter.

The first member 110 and the second member 120 are preferably joined together on both sides of the dividing line 12 . In this way, even if the member 100 is divided along the division line 12, separation of the first member 110 and the second member 120 can be suppressed.

Next, a method for manufacturing the sound absorbing member 10 will be described. First, a resin film as a material for the first member 110 is prepared, and the concave portion 112 is formed by processing the resin film. Thereby, the first member 110 is formed. Next, the concave portion 112 is filled with the granular composition 200 , and then the concave portion 112 is sealed with the second member 120 . After that, perforations are formed through the first member 110 and the second member 120 . This perforation becomes the dividing line 12 . However, if the dividing line 12 is formed only in the first member 110, the perforations are formed before the recess 112 is filled with the granular composition 200, more preferably before the recess 112 is formed. be.

As described above, according to the present embodiment, the sound absorbing member 10 is formed using the member 100 and the granular composition 200 . A particulate composition 200 is contained in the hollow portion 130 of the member 100 . The member 100 is formed using the first member 110 and the second member 120 . Hollow portion 130 is a space surrounded by recess 112 of first member 110 and second member 120 . Therefore, the sound absorbing member 10 can be easily manufactured, and as a result, the manufacturing cost of the sound absorbing member 10 can be reduced.

Although the embodiments of the present invention have been described above with reference to the drawings, these are examples of the present invention, and various configurations other than those described above can also be adopted.

10 sound absorbing member 12 wire 100 member 110 first member 112 recessed portion 114 region 120 second member 130 hollow portion 200 composition

Claims (2)

A first member formed of one sheet of flexible resin film, the first member having a plurality of recesses, and a sheet-like second member formed of one sheet of flexible resin film. a second member that seals the plurality of recesses and forms a plurality of hollow portions separated from each other by the first member; In the method for manufacturing a sound absorbing member comprising the composition of
a first step of preparing the first member by forming the plurality of recesses in one sheet of flexible resin film by vacuum forming;
a second step of filling the granular composition into the plurality of recesses;
a third step of sealing the plurality of recesses with the second member, which is a step performed after the second step;
A method of manufacturing a sound absorbing member comprising: A dividing line extending along each recess of the plurality of recesses is formed between the plurality of recesses in the first member,
A method for manufacturing the sound absorbing member according to claim 1 .

Images