JPH09229286A - Pipe lagging structure with good sound insulation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide effective good sound insulation performance with a small mounting volume by directly sticking a metal plate which has a specified thickness and has a viscoelastic resin layer having a specified thickness on one surface to a steel pipe for piping. SOLUTION: A viscoelastic resin layer 2 having a thickness of 75μm is made by applying acrylic resin on one side of a galvanized steel plate 1. A polypropylene film having a thickness of 40μm is laminated on the viscoelastic resin layer 2 as a separating sheet 3. This lagging member is stuck to a steel plate having the same width. The galvanized steel plate 1 has a thickness of 0.1 to 1.0mm to exert a specified damping effect and the viscoelastic resin layer 2 having a thickness of 10μm. This prevents the divergence of the vibration and noises of fluid in the pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piping lagging structure having improved soundproofing characteristics.

[0002]

2. Description of the Related Art A sound absorbing material such as glass wool or rock wool is wound around the pipe in order to improve the soundproofness of the pipe. It is also known that when the sound insulating material and the sound absorbing material are wound around the pipe in a multi-layered state, the volume reduction is increased. Sound insulation materials include soft sound insulation sheets made of polyvinyl chloride resin or rubber resin, soundproof cement, lead plate, and the like.

[0003]

However, the conventional method of improving soundproofing has a problem in workability because a relatively large volume is occupied by the sound absorbing and sound insulating material. The present invention has been devised to solve such a problem, by directly attaching a metal plate having a viscoelastic resin layer to the pipe,
The purpose is to obtain a pipe with improved soundproofing efficiency with a small volume occupation ratio.

[0004]

In order to achieve the object, the piping lagging structure of the present invention has a thickness of 10 to 200 μm.
0.1 to 1.0 thickness of the viscoelastic resin layer formed on one side
It is characterized in that a metal plate of mm is directly attached to a steel pipe for piping. As the metal plate, for example, a cold rolled steel plate, a galvanized steel plate, an aluminized steel plate, a stainless steel plate, a plain steel plate, a copper plated steel plate, a zinc plate, an aluminum plate, a copper plate, etc. are used. The viscoelastic resin layer has a micro layer separation structure that exhibits vibration-damping properties such as single or blend considering the heat resistance, polymer alloy, etc., and the basic resin skeleton is acrylate resin or silicon resin. Resin is used. In order to have a vibration damping property in a wider area, it is possible to perform a treatment such as blending a plurality of components having various glass transition temperatures.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In a pipe lagging structure according to the present invention, a lagging material to be attached to a pipe has a viscoelastic resin layer 2 provided on one surface of a metal plate 1 as schematically shown in FIG. There is. In addition, it is preferable to laminate the release sheet 3 on the viscoelastic resin layer 2 in order to facilitate attachment to the pipe. The metal plate 1 needs to have a thickness of 0.1 to 1.0 mm in order to exert a predetermined vibration damping effect.
With the metal plate 1 having a thickness of less than 0.1 mm, the function as the constraining layer is insufficient, and the vibration damping effect is reduced. vice versa,
When the plate thickness exceeds 1.0 mm, it becomes difficult to attach the pipe, and the workability is poor. The viscoelastic resin layer 2 has a thickness of 1
When the thickness is less than 0 μm, the vibration damping property is remarkably reduced, and when the thickness is more than 200 μm, the viscoelastic cohesive force is reduced. The material of the viscoelastic resin layer 2 is used by adhering it if necessary.
Stickiness is required. Therefore, it is preferable to use a tacking agent or the like that enables pressure-sensitive adhesion with the resin component.

Until the lagging material is attached to the pipe, the stickiness of the viscoelastic resin layer 2 hinders the handling.
Therefore, it is preferable that a synthetic resin film such as OPP or paper is laminated on the viscoelastic resin layer 2 as the release sheet 3. The release sheet 3 is also effective in preventing deterioration of the viscoelastic resin layer 2 due to deterioration over time such as air oxidation. At the time of construction, the release sheet 3 is released from the viscoelastic resin layer 2 and the lagging material 4 is attached to the pipe 5 as shown in FIG. The pipe 5 to which the lagging material 4 is attached is not subjected to vibrations due to water vapor or the like flowing inside the piping 5.
Acts as a restraint layer and suppresses vibration, so the volume of sound emitted to the outside is reduced.

[0007]

[Example] Plate thickness is 0.3 mm, 0.35 mm, 0.5 m
Each galvanized steel sheet of m was used as a metal plate 1, and an acrylic resin was applied to one surface thereof to form a viscoelastic resin layer 2 having a film thickness of 75 μm. A 40 μm-thick polypropylene film was laminated as a release sheet 3 on the surface of the viscoelastic resin layer 2. This lagging material has a strip shape with a width of 25 mm and a plate thickness of 1.0.
It was attached to a steel plate having the same width of 10 mm and the adhesive strength was measured at a pulling speed of 50 mm / min in accordance with JIS K6854.
As can be seen from the measurement results in Table 1, it can be seen that the pipe can be attached with sufficient adhesive strength.

[0008]

Next, the thickness is 6.4 mm and the diameter is 330 mm.
Each lagging material was attached to the steel pipe of and the soundproof property was investigated as follows. (1) Pipe Vibration Excitation Test In order to evaluate the soundproofing characteristics of the lagging material 4 against solid-borne sound (secondary radiated sound), the pipe 5 was vibrated by an electromagnetic exciter 6 as shown in FIG. . Noise caused by vibration
Sound was collected by a microphone 7 arranged inside the pipe 5 and a microphone 8 arranged outside the pipe 5, and a sound pressure level (F characteristic) was measured by a sound level meter 9. An iron plate 11 was placed on the upper opening of the pipe 5 via the felt 10. (2) Piping Sound Pressure Excitation Test In order to evaluate the soundproofing characteristics of the lagging material 4 against airborne sound, a speaker 12 is placed inside the piping 5 and the sound pressure levels (F characteristics) of the microphones 7 and 8 are measured. did.

Table 2 shows the measurement results. In addition, in Table 2,
Comparative Example 1 shows the case where the lagging material is not attached, and Comparative Example 2 shows the case where the stainless steel foil lagging material having a thickness of 0.08 mm is attached. As is clear from Table 2, in Examples 1 to 3, the internal sound (microphone 7) 9 at the level of all-pass was compared with Comparative Example 1 in which the damping process was not performed.
A sound-proofing effect of 10 to 10 dB and external sound (microphone 8) of 6 to 9 dB was obtained by a pipe vibration excitation test. From this, it is understood that the lagging material 4 serves as a constraining layer to suppress vibration. In the pipe sound pressure excitation test, Examples 1 to 3
As compared with Comparative Example 1 in which the vibration damping process was not performed, the soundproofing effect of the internal sound (microphone 7) of 1 dB and the external sound (microphone 8) of 10 to 12 dB was obtained at the all-pass level. From these results, the solid propagation sound of the lagging material 4 (secondary radiation sound)
It can be seen that the sound-proofing property against the is larger than the sound-proofing property of the air-borne sound, and that the damping effect on the solid contributes greatly. Further, the thickness is less than the thickness specified in the present invention 0.0
In Comparative Example 2 to which the 8 mm lagging material 4 was attached, both the pipe vibration excitation test and the pipe sound pressure excitation test were inferior in sound insulation effect to Examples 1 to 3. From this result, it is understood that a lagging material having a plate thickness of 0.1 mm or more is necessary to obtain a predetermined soundproofing property.

[0011]

[0012]

As described above, in the piping lagging structure of the present invention, the lagging material having the viscoelastic resin layer laminated on one surface of the metal plate is directly attached to the piping. Since the metal plate is attached via the viscoelastic resin layer, the noise caused by the vibration of the fluid flowing inside the pipe is suppressed from escaping to the outside, and it is quiet when used as indoor piping. It becomes possible to create a space.

[Brief description of drawings]

FIG. 1 is a sectional structure of a lagging material according to the present invention.

[Fig. 2] Piping with lagging material

FIG. 3 is a diagram illustrating a test for investigating the soundproofing property of lagging material.

[Explanation of symbols]

1: Metal plate 2: Viscoelastic resin layer 3: Release sheet
4: Lagging material 5: Piping 6: Electromagnetic vibrator 7,8: Microphone 9: Sound level meter 10: Felt 11: Iron plate 12: Speaker

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Kenji Koshiishi 7-1 Takayashinmachi, Ichikawa-shi, Chiba Prefecture Nisshin Steel Co., Ltd.

Claims (1)

[Claims] 1. A piping lagging structure having excellent soundproofing, wherein a metal plate having a thickness of 0.1 to 1.0 mm and a viscoelastic resin layer having a thickness of 10 to 200 μm formed on one surface is directly attached to a steel pipe for piping. .