JP2002061125A - Sound absorbing material protective film sticking structure in sound absorbing plate and sticking method and protective film sheet therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly and surely stick a protective film of a sound absorbing material with an excellent outward appearance to punching metal without degrading sound absorptivity, and to safely, sanitarily and efficiently perform the work. SOLUTION: The protective film 8 is stuck to the punching metal 4 via a porous thermally melting adhesive layer 10 by a hot press instead of a solvent type adhesive. At this time, a material formed by applying the adhesive layer 10 by an applying roller is used as the protective film 8. Thus, nonuniformity of application of the adhesive is eliminated, uniform adhesive strength is obtained over the whole surface adhesive does not drip, and work is facilitated. Health impairment of an operator by a volatile solvent and a danger of causing a fire are reduced. Since the adhesive layer 10 is porous, ventilating performance is maintained, and a sound absorbing effect is not degraded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound absorbing plate attached to the back and side surfaces of a highway viaduct or the like, in which a sound absorbing material protective film is attached to a porous material covering the sound absorbing surface of the sound absorbing material. And a protective film sheet.

[0002]

2. Description of the Related Art In a three-dimensional road structure in which an elevated road is provided above an ordinary road, the noise of vehicles traveling on the lower ordinary road hits the backside of the viaduct and is reflected, thereby causing noise pollution around the road. There is. In order to suppress this noise, as shown in FIG. 9, construction work for attaching the sound absorbing plate 1 to the back surface of the viaduct L is underway. In order to cut off noise from an elevated road or the like, the sound absorbing material 1 is attached to the inner surface of the side wall W of the road.

As shown in FIGS. 7 and 8, the sound absorbing plate 1 accommodates a sound absorbing material 3 made of glass wool in a box 2 made of a metal plate such as aluminum, and a punching metal 4 in an opening of the box 2. The sound absorbing material 3 is covered with a film 5
The two ends of the support rod 6 inserted into the valley of the wavy sound absorbing surface are protected by water and dust,
Attached to.

In the sound absorbing plate 1, since the punching metal 4 has a return at the time of perforation, a protective film 8 made of glass cloth is adhered to the inner surface of the punching metal 4, and the film 5 comes into contact with the return and breaks. Has been prevented. In pasting the protective film 8 to the punching metal 4, conventionally, an adhesive liquefied with a solvent is applied to the punching metal 4 by a spray gun or the like, and the protective film 8 is put thereon and pressed.

[0005]

However, in the above-mentioned bonding method, it is difficult to apply the adhesive evenly, and the adhesive sometimes drips from the holes of the punching metal, giving an unsightly appearance. Further, the health of workers may be impaired by the organic solvent contained in the adhesive.

The present invention has been made in view of the above problems, and has been made to enable a protective film of a sound-absorbing material to be uniformly and aesthetically stuck to a perforated plate such as a punched metal, so that the work can be performed safely, hygienically and efficiently. Make it an issue.

[0007]

In order to solve the above-mentioned problems, the present invention provides a method in which a porous hot-melt adhesive layer is interposed between a porous plate and a protective film in place of a solvent-based adhesive, and the hot press is performed. The protective film was stuck through the adhesive layer.

In this manner, the protective film can be easily and safely adhered to the entire surface of the perforated plate with uniform adhesive force without unevenness or dripping of the adhesive. At this time, since the adhesive layer is porous, the decrease in air permeability is small and the sound absorbing effect does not decrease.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION As an embodiment of the present invention, a sound absorbing material is housed in a box, and the opening of the box is a sound absorbing plate covered with a perforated plate. The sound absorbing material protective film sticking structure in the sound absorbing plate in which the protective film of the sound absorbing material is stuck by hot pressing via the heat melting adhesive layer, adopting a configuration in which the heat melting adhesive layer is porous. obtain.

[0010] Porosity (opening degree) of the hot-melt adhesive layer
May be appropriately set in accordance with the degree of opening of the perforated plate so as to obtain a sufficient bonding strength. Generally, however, in order to obtain a good bonding state, about 50 g / m ² or more is required for the bonding layer. Density is required. At this time, the sound absorbing performance is also considered.

As the porous form, various forms such as a spider web, a net, and a plain weave in which a filamentous adhesive is entangled can be considered, and the openings are regularly arranged like a net or a plain weave. When it is uniform, a good adhesion state can be obtained, and the thickness of the adhesive layer can be reduced, so that the reduction in sound absorption can be minimized. In this bonding state (bonding strength), it is necessary to consider penetration of rain or the like. For example, a sound absorbing plate provided on the back surface of a viaduct does not require rain, so high bonding strength is not required. The sound absorbing plate must be completely adhered because rainwater may enter. For this purpose, the method of attaching the sound absorbing material protective film requires a high adhesive strength. For this reason, it is preferable that the opening is uniform for the side wall.

As a method for attaching the protective film, a hot-melt adhesive sheet is interposed between the porous plate and the protective film, and the protective film can be attached to the porous plate by hot pressing. At this time, if the adhesive sheet has a release paper, the release paper is peeled off and sandwiched.

[0013] For this reason, as another method of attaching the protective film, the protective film sheet is sandwiched between a feed roll and a hot-melt adhesive application roll and sent out, and the hot-melt adhesive is applied by the application roll. Is applied on the sheet for protective film to form a heat-meltable adhesive layer, and the sheet for protective film with the heat-meltable adhesive layer is heat-pressed on the inner surface of the perforated plate and adhered via the heat-meltable adhesive layer. A configuration may be employed.

In this case, since the heat-meltable adhesive layer is formed in advance on the protective film sheet, the work of sandwiching (intervening) the adhesive sheet is not required. Also, in general, the protective film sheet is a porous material such as glass cloth, so when the adhesive is applied by a roll, the applied layer becomes porous,
A porous adhesive layer is naturally formed. Furthermore, on the surface of the application roll, for example, a ridge or a dent such as a net or a plain weave is formed, and the adhesive on the ridge or in the dent is transferred to correspond to the surface shape. An adhesive layer is formed on the protective film sheet. For this reason, formation of a porous hot-melt adhesive layer becomes easy.

[0015]

One embodiment is shown in FIGS. 1 to 3, and in this embodiment, as shown in FIG. 1, a hot-melt polyamide-based adhesive made of a plain weave is applied to the surface of a glass cloth forming a protective film 8. FIG. The adhesive layer 10 is formed. As shown in FIG. 2, the glass cloth 8 with the adhesive layer 10 is fed from the protective film roll 8 a via the pinch roll 13 between the adhesive application roll 11 and the feed roll 12, and the glass cloth 8 is applied as it travels. A hot-melt adhesive is applied to the glass cloth 8 by the roll 11 and wound on a winding roll 14. At this time, a plain weave (lattice) ridge is formed on the surface of the application roll 11, and the transfer of the adhesive on the ridge causes the plain woven adhesive layer 10 shown in FIG.
Are formed on the glass cloth 8 with regular openings 10a.

To attach the glass cloth 8 with the adhesive layer 10 thus obtained to the punching metal 4, as shown in FIG. 3, the punching metal 4 is placed on the lower die d ₁ of the press P. The glass cloth 8 is put on it. At this time, since the adhesive layer 10 is directly formed on the glass cloth (protective film) 8, the backing sheet or the like, which will be described later, is peeled off, and the glass cloth 8 and the adhesive layer 10 do not have to be aligned with each other. Just cut the glass cloth 8
The workability is good because it can be set on the press P. Then, the upper die d ₂ and the lower die d ₁ and punching metal 4 in the press P, sandwiching the glass cloth 8, when hot pressing, hot-melt adhesive layer 10 is melted, with the subsequent cooling Then, the punching metal 4 and the glass cloth 8 are bonded. After sticking the glass cloth 8 to the punching metal 4 in this way, the punching metal 4 is bent into a required shape to obtain the sound absorbing plate 1 shown in FIGS.

In the actual bonding, the heating temperature is 105 to 115 when the opening ratio of the punching metal is 63% (hole diameter φ15, pitch 18 mm), the bonding area is 1 m ² , and the thickness of the punching metal is 1.0 mm. ℃, pressure 4kgf
/ Cm ² , and pressurizing time is 80-100 seconds, and the opening ratio of the punching metal is 54% (pore diameter φ1
0, a pitch of 13 mm), a sticking area of 1 m ² , and a punching metal thickness of 1.0 mm.
110 ° C, pressure 4kgf / cm ² , pressurization time 90-1
By performing the heating press for 20 seconds, good adhesion results were obtained.

According to this method, there is no uneven application of the adhesive, a uniform adhesive force can be obtained over the entire surface, and no dripping of the adhesive results in a beautiful finish. In addition, the risk of a health hazard to workers and the risk of fire due to volatile solvents is reduced, and occupational health and safety and environmental issues are solved. Further, since the work efficiency is excellent and a drying furnace is not required, the cost can be reduced.

In the above embodiment, the heat-meltable adhesive layer 10 was formed directly on the protective film sheet (glass cloth) 8, but as shown in FIG.
5a, the application roll 11 and the feed roll 12
To form the hot-melt adhesive layer 10. In this case, as shown in FIG. 5, the hot-melt adhesive layer (sheet) 10 is peeled off from the mount 15 and interposed between the glass cloth (protective film) 8 and the punching metal 4 and then hot pressed. In this embodiment, since the mount 15 is provided, it is easy to cut even a small area.
This is advantageous when the area of the (punched metal 4) is small.

Further, in the case where the heat-fusible adhesive layer 10 can be manufactured without the need for the mount 15, for example, in the case of a spider web 10 ′ shown in FIG. 6, it is interposed as shown in FIG. Spider web-shaped hot-melt adhesive layer (sheet) 10 '
As a Cranbetter (product name) manufactured by Kurashiki Spinning Co., Ltd.
Can be mentioned.

[0021]

As described above, in the present invention, a protective film is stuck to a perforated plate via a porous hot-melt adhesive layer by a hot press instead of a solvent-based adhesive. There is no adhesive coating unevenness and no dripping of the adhesive without lowering the sound absorption coefficient, uniform adhesive strength is obtained over the entire surface, and a beautiful finish can be obtained. The risk of health problems and fires is reduced, and occupational health and safety and environmental issues are resolved.
Also, since it has excellent work efficiency and does not require a drying oven,
Cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of one embodiment of a protective film sheet with a heat-meltable adhesive layer.

FIG. 2 is a diagram illustrating the production of the embodiment.

FIG. 3 is a sectional view showing one embodiment of a method for attaching a protective film according to the embodiment.

FIG. 4 is an explanatory view showing the production of another embodiment of the hot-melt adhesive layer.

FIG. 5 is a sectional view showing one embodiment of a method for attaching a protective film according to the embodiment.

FIG. 6 is a perspective view of one embodiment of a sheet forming another heat-meltable adhesive layer.

FIG. 7 is an exploded perspective view showing the structure of the sound absorbing plate.

FIG. 8 is a longitudinal sectional side view of the sound absorbing plate.

FIG. 9 is a perspective view showing a state where the sound absorbing plate is attached to the viaduct.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 sound-absorbing plate 2 box 3 sound-absorbing material 4 punched metal (perforated plate) 5 film 8 protective film (glass cloth) 10, hot-melt adhesive layer (sheet) 10 a opening 11 hot-melt adhesive layer application roll 12 feed roll P press d _1, d ₂ die

Claims (5)

[Claims] 1. A sound-absorbing material (3) is housed in a box (2), and the opening of the box (2) is covered with a perforated plate (4). The sound-absorbing material protection film-adhering structure in the sound-absorbing plate 1 bonded by hot pressing through the heat-fusible adhesive layer 10, wherein the heat-fusible adhesive layer 10 is porous. Material protective film sticking structure. 2. The sound-absorbing material protective film sticking structure in a sound-absorbing plate according to claim 1, wherein said hot-melt adhesive layer 10 has a plain weave shape. 3. A method for adhering a protective film to the sound-absorbing plate 1 according to claim 1, wherein the protective-film sheet 8 is fed with a roll 12 and the hot-melt adhesive. The hot-melt adhesive is applied between the coating roll 11 and the protective film sheet 8.
The hot-melt adhesive layer 10 is formed on the porous plate 4 with the hot-melt adhesive layer 10.
A method for adhering a protective film on a sound absorbing plate, wherein the inner surface is heat-pressed and adhered via a hot-melt adhesive layer 10. 4. A method of attaching a protective film to a sound absorbing material according to claim 2, wherein the applying roll 11 has a grid-like convex or concave strip formed on the surface of the coating roll 11. 4. The method according to claim 3, wherein said heat-fusible adhesive layer is plain-woven. 5. The protective film sheet used for the sound absorbing material protective film sticking structure in the sound absorbing plate according to claim 1 or 2, wherein the heat-meltable adhesive layer 10 is heated by an application roll 11 in advance. A sound-absorbing material protective sheet formed by applying a fusible adhesive.