JPH0777780B2 - Damping floor base material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a floor base material having a vibration-damping effect, which is composed of plywood having a coniferous tree as a raw wood and having no surface (brushless surface).

[Conventional technology and its problems]

High-rise and high-rise apartments are actively being built, and in such a situation, vibration noises in neighboring households have been occurring.

As an underfloor material to solve such a problem, there is one in which a damping sheet is interposed in a plywood in which a front plate and a back plate are bonded and integrated on the front and back surfaces of a core material. The vibration damping sheet of this one includes a rubber sheet, a foamed plastic sheet, and
It is made of felt, which is a mixture of metal fibers, plastic fibers, animal fibers, and the like.

However, the floor base material made of the above various vibration damping sheets is not generally widely used because of the fact that sufficient vibration damping effect cannot be obtained, or even if obtained, it is expensive. is there.

On the other hand, as raw wood for the above plywood, Lauan has been used for many years because it has very few knots and is easy to process, but the consumption of plywood has increased, and as a result of deforestation, resources have been depleted and Destruction is becoming an international problem.

Under such circumstances, it is becoming difficult to obtain Lauan today, and the price is gradually increasing. On the other hand, one of the coniferous trees, radiatapine, has been attracting attention as radiatapine, which is reported to be easy to plant and grow quickly, and it has been reported in previous studies that it will reach 50-60 cmφ for 30 years. By the way, comparing the price of rawan and radiatapine is about 65:40.

However, Radiata Pine has a short internode and cannot take the long, uncut logs like Lauan. According to the results of the survey so far, the internodal length is 70 cm or less in Chile, 90 cm or less in South Africa, and 120 cm or less in New Zealand.

Therefore, the applicant of the present application, in Japanese Patent Application No. 1-170734 or the like, is a conventionally known floor base material composed of plywood in which front and back plates are bonded and integrated to the front and back surfaces of the core material, and the core material is The conifer is continuously sliced along the circumferential direction of its outer peripheral surface, and the required sheets of veneer are alternately crossed by 90 degrees each to be stacked and bonded together, and the front plate and the back plate are made of conifer. Interstitial uncut raw wood consisting of veneer sliced continuously along the circumferential direction of its outer peripheral surface, the fibers are parallel to the short side of the core, and at least one ply of each veneer Average particle size 1.0 to 2.0 mm at the mating part
We proposed a vibration-damping floor base material in which a vibration-damping sheet made by binding vulcanized granular rubber with a heat-fusible rubber plastic is interposed and self-bonded.

This damping floor base material uses coniferous trees that are easy to plant and grow fast, so the forest can be used for rotation in about 40 years, there is no fear of resource depletion, and the self-fusing property of the damping sheet Since the plate materials are joined together, the manufacturability is good, and due to the presence of the granular rubber, the vibration damping property is superior to the conventional one.

However, nowadays, when more space and time are desired, it is desired to further improve the vibration damping property in order to secure the space.
The vibration damping property is improved by increasing the thickness of the vibration damping sheet, but on the other hand, the front and back wood board materials of the floor base material are displaced due to the weak pressure resistance of the vibration damping sheet. That is, tilt deformation is likely to occur.

The present invention has been made in view of the above points, and an object thereof is to improve the damping property without thickening the damping sheet.

[Means for Solving the Problems]

In order to solve the above-mentioned problem, in the present invention, in the damping floor base using the above-mentioned softwood, the whole or a part of the core material is configured as a particle board.

Incidentally, the vibration damping sheet, similarly to the above-mentioned application, the total amount of butyl rubber 60 to 90 parts by weight and low density polyethylene 10 to 40 parts by weight is 100 parts by weight, and an average particle size of 1.0 to 2.0 mm.
60 to 220 parts by weight of vulcanized granular rubber may be added.

The vulcanized granular rubber is preferably 120 to 150 parts by weight, and the average particle diameters of 1.0 to 1.5 mm and 1.6 to 2.0 mm are preferably mixed in equal amounts.

The butyl rubber is preferably 30 to 50 parts by weight, and the regenerated butyl rubber may be 20 to 60 parts by weight, preferably 30 to 50 parts by weight.

If necessary, stabilizers such as zinc white, powdered steering acid and zinc steering acid, processing aids such as paraffin flakes and processability imparting oil, and fillers can be added to the vibration damping sheet.

Further, in the formulation of the vibration damping sheet, when the content of butyl rubber, recycled butyl rubber and low density polyethylene (LDPE) is less than the above amount, the binding of vulcanized granular rubber becomes poor,
In addition, the adhesive strength at the interface between the layers is reduced. Further, if the number is too large, there is a large amount of inclinational deformation due to long-term load, and it cannot be used.

In addition, the reason why the vulcanized granular rubber has two kinds of particle diameters within the above range is to fill the grain boundaries in a preferable state, and the impact sound (impact vibration) is efficiently absorbed while being dispersed and propagated within itself. This is to allow it. Also, when the particle size becomes large, the binding becomes poor and the particles collapse. The smaller the particle size, the lower the dispersion and absorption effects.

When the compounding amount of the vulcanized granular rubber is large, the binding becomes poor. When it becomes smaller, the vibration absorption effect and the deformation of long-term load become problems.

Further, it is possible to add polybutene, liquid chloroprene, or the like for improving the fusing property and the adhesiveness when the vibration damping sheet is interposed in the plywood.

[Operation] According to the present invention configured as described above, the vibration damping property and the sound absorbing property are improved by the sound absorbing property and the vibration absorbing property of the particle board.

〔Example〕

An embodiment is shown in FIG. 1, in which the front and back plates are made of a wooden plate material 1, and a particle board 2 as a core material is interposed between them by a vibration damping sheet 3.

As shown in FIG. 2 (a), the wood board 1 is made by stacking and adhering 1.0 mm-thick single boards 1a, 1b, 1c and integrating them, and the fibers are alternately crossed by 90 degrees. There is. As shown in FIG. 2 (b), the veneers 1a, 1b, and 1c are slices of an unjointed radiata pine log W that has been internoded, sliced along the circumferential direction of the outer peripheral surface, so-called "glazed". Form.

The particle board 2 is a well-known one in which shavings are pressure-bonded through a binder, and has a thickness of 9 and 12 mm.
The damping sheet 3 has the kneading composition (a, b, c) shown in Table 1, and the thickness thereof is 2.0 mm and 1.6 mm. That is, a wooden board 1 (3.0 mm), a particle board 2 (9 mm), a damping sheet 3 (2.0 mm, a, b, c 3 types) (Example 1), a wooden board 1 (3.0 mm), Particle board 2
(12 mm) and the damping sheet 3 (1.6 mm, 3 types of a, b, c) (Example 2) were manufactured.

The manufacturing conditions are that the vibration damping sheet 3 can be bonded to the other members 2 and 1 by the self-bonding property. A known adhesive is used for the adhesion of, and the amount of glue: 32-39 g /
m ² , hot pressure temperature: 125 ° C. to 130 ° C., surface pressure: 8 to 10 kgf / cm ² , hot pressure time: 3.5 to 5 minutes.

In addition, as a comparative example, the construction of only the wood board 1 is 15 mm
We made thick structural plywood.

When the floor impact sound level was measured in accordance with JIS A 1418 in Examples 1 and 2 and Comparative Example, the former obtained an improvement result of 3 to 14 dB as compared with the latter. In particular, there was an improvement effect of 10 to 14 dB at 250 to 2000 Hz, which is a light impact sound in which impact sound is a problem.

In addition, in Examples 1 and 2, structural plywood grade 1 (90 ° direction) was used in accordance with the Japanese agricultural standard test method for structural plywood.
Table 2 shows the results of the bending test and the second-class bending test.

The results show that both examples are satisfactory as structural plywood.

In the above embodiment, it is not necessary to use all of the core material 2 as the particle board 2, but a part of the core material 2 may be used in Japanese Patent Application No. 1-17.
It is also possible to make a plywood in which the required sheets of veneer obtained by continuously slicing a conifer similar to the core material of No. 0734 along the circumferential direction of its outer peripheral surface are alternately crossed with their fibers by 90 degrees and laminated and bonded together. it can.

〔The invention's effect〕

Since the present invention uses the particle board as described above, it has an effect of improving the vibration damping property and the sound absorbing property.

[Brief description of drawings]

FIG. 1 is a partial perspective view of an embodiment of a damping floor base material according to the present invention, and FIGS. 2 (a) and 2 (b) are manufacturing explanatory views of a wooden board material. 1 ... Wood board, 1a, 1b, 1c ... Veneer, 2 ... Particle board, 3 ... Damping sheet.

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Jun Nakajima 2-3-1 Iwata-cho, Higashi-Osaka City, Osaka Prefecture Tatsuta Electric Wire Co., Ltd. (72) Inventor Kihachi Onishi 2-3-3 Iwata-cho, Higashi-Osaka City, Osaka Prefecture No. 1 In Tatsuta Electric Wire Co., Ltd. (72) Minor Aoki Minoru Aoki 8-9-8 Adachi-ku, Tokyo Keio Co., Ltd. (72) Inventor Shunji Suzuki 8-9 Hanabata, Adachi-ku, Tokyo Within Keiyo Co., Ltd. (72) Inventor Shin Nishida 8-9-8 Hanabata, Adachi-ku, Tokyo Within Keio Co., Ltd. (56) Reference JP-A-3-33365 (JP, A) (JP, U) Actually open Sho 53-80911 (JP, U)

Claims (5)

[Claims] 1. A floor base material comprising a plywood in which a front plate 1 and a back plate 1 are bonded and integrated on the front and back surfaces of a core material 2, and the core material 2
And a particle board 2 which is made by adhering and integrating a required number of veneer sheets obtained by continuously slicing a coniferous tree along the circumferential direction of the outer peripheral surface thereof by alternately intersecting the fibers at 90 degree intervals, and the particle board 2. The front plate 1 and the back plate 1 are composed of a single plate obtained by continuously slicing an internode-free raw wood of a coniferous tree along the circumferential direction of its outer peripheral surface, and its fibers are parallel to the short sides of the core 2. Further, a vibration damping sheet 3 formed by binding a vulcanized granular rubber having an average particle diameter of 1.0 to 2.0 mm with a heat-fusible rubber plastic is interposed in at least one overlapping portion of each of the single plates and the particle board 2.・ Vibration damping floor base material characterized by self-bonding. 2. The damping floor base material according to claim 1, wherein the core material 2 is entirely made of particle board, and the vibration damping sheet 3 is interposed between the core material 2 and the front and back plates 1, 1. Characteristic damping floor base material. 3. The damping floor base material according to claim 1, wherein the damping sheet 3 has a total amount of 60 to 90 parts by weight of butyl rubber and 10 to 40 parts by weight of low-density polyethylene of 100.
A damping floor base material comprising 60 parts by weight of vulcanized granular rubber having an average particle size of 1.0-2.0 mm and 60-220 parts by weight of the vulcanized granular rubber. 4. The damping floor base material according to claim 1, wherein the average particle size is 1.0 to 1.5 mm and 1.6 to 2.0 mm.
A vibration-damping floor base material, characterized in that an equal amount of vulcanized granular rubber is mixed. 5. The damping floor base material according to claim 3 or 4, wherein regenerated butyl rubber is contained in butyl rubber.