JPH0715212B2 - 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 or multi-story housing is being actively built, and in such a situation, problems due to vibration noise 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, since the rubber sheet has a dense structure, the vibration dispersibility is low, and therefore the vibration damping sheet using this rubber sheet cannot obtain a sufficient vibration damping effect. Further, the foamed plastic sheet is excellent in sound absorption due to its porous property, but inferior in elasticity. Therefore, the vibration damping sheet made of the foamed plastic sheet cannot obtain a sufficient vibration damping effect.

Further, the vibration damping sheet made of the felt or the like is difficult in terms of elasticity and is not sufficient in the vibration damping property, and the felt is generally more expensive than the rubber sheet or the like.

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 exhausted and forests have been depleted. Destruction is progressing and it 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 easy to plant and grows quickly, and it has been reported in previous studies that it will reach 50-60 cmφ in 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, in view of the above situation, an object of the present invention is to provide a floor base material that is inexpensive and has a large vibration damping effect by using a softwood such as radiatapine.

[Means for Solving the Problems]

In order to solve the above problems, in the present invention, in a floor base material made of plywood in which front and back plates are bonded and integrated to the front and back surfaces of the core material, the core material is a coniferous tree in the circumferential direction of its outer peripheral surface. Along with the fibers (grains) alternately intersecting each other at 90 degrees, the required plates of the single plate sliced continuously along with each other are stacked and adhered integrally, and the front plate and the back plate are the internodes of the softwood. Consisting of a veneer obtained by continuously slicing the kushibana along the circumferential direction of its outer peripheral surface, the fibers of which are parallel to the short sides of the core material, and at least one superposed portion of each veneer has an average value. A vibration-damping sheet made by binding vulcanized granular rubber with a particle size of 1.0 to 2.0 mm with self-bonding rubber plastic is intervening and self-bonding. The vibration-damping sheet is low at 60-90 parts by weight of butyl rubber. Density polyethylene 10 ~
The total amount of 40 parts by weight is 100 parts by weight, and the average particle size
The composition was made by adding 60 to 220 parts by weight of vulcanized granular rubber of 1.0 to 2.0 mm.

The vulcanized granular rubber is preferably 130 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.

Further, if necessary, the damping sheet may contain powdered stearic acid, a stabilizer such as zinc stearate, paraffin flakes,
A processing aid such as a processability-imparting oil or a filler can be added.

When the content of butyl rubber, recycled butyl rubber and low density polyethylene (LDPE) is less than the above amount in the formulation of the vibration damping sheet, the binding of the vulcanized granular rubber becomes poor and the adhesive force at the laminating interface decreases. 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 in the above range is to fill the grain boundaries in a preferable state, so that the impact sound (impact vibration) is efficiently dispersed while propagating in 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.

[Action]

The damping floor base material configured as described above has no knots on the front and back sides, and the core material is made of laminated veneer by alternately intersecting the fibers of the veneer at 90 degrees, and is bonded and integrated. The impact sound (impact vibration) applied to the floor is absorbed by the vibration damping sheet. The vulcanized granular rubber is
Withstands long-term loads applied to the floor surface and prevents inclined floor deformation.

More specifically, vulcanized rubber with large and small diameters fills the mutual grain boundaries in a favorable state and is bound with butyl rubber and low density polyethylene, so that the impact sound (impact vibration) is dispersed and propagated within itself. While being absorbed.

〔Example〕

First, as shown in FIGS. 1A to 1D, floor base materials having various structures were manufactured. The same figures (a) to (c) relate to the present invention, and are composed of a veneer 1, a plywood 2 and a damping sheet 3. (a) is a veneer 1: 1.5 mm thick, plywood 2: 5.5 mm thickness, damping sheet 3: 2.0 mm thickness, (b) is plywood 2: 5.5 mm thickness, damping sheet 3: 2.0 mm thickness, (c) is veneer 1: 3 mm thickness, plywood 2: 4 mm thickness ,
Damping sheet 3: 1.5mm thick. Further, (d) is entirely made of plywood 2 and has a thickness of 12 mm.

As shown in FIG. 2 (a), the plywood 2 is a single plate 2a, 2
It is made by stacking and adhering b and 2c, and the fibers are alternately crossed by 90 degrees. Its veneers 2a, 2
b, 2c and the single plate 1 are, as shown in FIG. 2 (b),
The radiata pine log W is sliced along the circumferential direction of the outer peripheral surface, that is, so-called "cut and peeled". In addition, the veneer 1 is sliced from the knotless raw wood obtained by internodes so that no node appears on the surface.

The floor base material configured in this manner was formed from the vibration damping sheet 3 having the kneading composition shown in Table 1, and Comparative Example (e),
As (f), a damping rubber having the composition shown in the same table was produced.

The manufacturing conditions were as follows.

Water content of veneer 12% or less Paste application amount 35 to 39gf / (30cm) ² Hot pressing temperature 125 ℃ to 130 ℃ Hot pressing time 5min / surface pressure 8 to 10kgf / cm ² Vibration-damping sheet 3 according to Examples (a) to (c) having the composition shown in Table 1.
Was not settled against a load of 100 kg on a surface of 30 × 90 cm for 1 month or more, but Comparative Example (e) was adopted as the floor base material having the configuration of FIG. 1 (a), For this floor base material,
With a pressing surface of width: 90 cm, depth: 30 cm, when a load of 100 kg was applied for one month, the damping sheet 3 was settled,
The entire base material was inclined and deformed.

Further, in the sheet of Comparative Example (f), the binding of the vulcanized granular rubber was insufficient, and the granular rubber spilled when bent. Therefore, it is difficult to use it for a long period of time.

Next, mount A shown in FIG. 3 (a) (Daiki: 105 × 210 × 2)
680 mm, joist: 45 x 45 x 1730 mm), and insert it into the mounting hole of the measurement room, and put the putty on the periphery of the mounting hole. As shown in the figure (b), mount A The floor base materials a, b, c and the floor base material d of the example were placed on the above.

The floor impact sound level of this test piece was measured according to JIS A 1418-1978 (Measuring method of floor impact sound level at the construction site) with the specifications shown in FIG. I did it. The sound receiving room was a reverberation room of 134 m ² . The impact point is shown in FIG.

Table 2 shows the improvement amounts of the other floor base materials a, b, and c with respect to the floor base material d (plywood only) based on the measurement results.

From this, it can be understood that the examples are effectively damping.

In addition, when the following test items were performed in the examples, they were sufficiently strong as floor base materials.

Test item Test standard: JIS structural plywood 1st class B-2 Moisture content test: Drying method Adhesion test: Repeated boiling boiling strength: Long-side direction and short-side direction Bending elastic modulus: 〃 Compressive strength: Long-side direction, short Side direction and diagonal direction In addition, on the surface of the example, a plate is attached as a makeup,
When a cracking test was performed on the board, no cracks were found even after being left indoors for 12 months.

Also, by applying an antiseptic / anticide treatment between each veneer 1, 2a, 2b, 2c, it becomes suitable for use in a humid and mildew environment, and also has an ant-proof effect. .

〔The invention's effect〕

 As described above, according to the present invention, the following effects are obtained.

(A) Since the vulcanized granular rubber, which is cheaper than felt, is used as the main vibration damping material and the self-fusing rubber plastic is used as the adhesive material, the impact sound is effectively dispersed and propagated by the granular rubber of a predetermined size. It is absorbed while being done. Therefore, it is possible to obtain a floor base material that is inexpensive and has a high vibration damping effect.

(B) By using vulcanized granular rubber and using an appropriate amount of binder, there is no inclination deformation due to long-term load.

(C) In place of the resource-depleted lauan, a coniferous tree (for example, radiatapine) that overcomes the problem of short internodes and that can be easily planted and grows quickly is used to obtain the same non-controlling flooring material as lauan. In other words, by using timber that is easy to plant and grows quickly, the forest can be used for rotation in about 40 years, and there is no fear of resource depletion.

(D) It is possible to obtain a vibration-damping floor base material that is inexpensive and has a quality equivalent to that of plywood made from raw wood.

(E) Normally, since the long side direction of the veneer is a fiber, when the veneer is pasted to make a floor plywood made of decorative plywood, the surface of the floor plywood is horizontal and the veneer is vertical and inevitably fiber. Cross each other 90 degrees to increase the surface strength of the decorative flooring base material and prevent cracking of the attached board.

[Brief description of drawings]

1 (a) to (d) are partial perspective views showing various configurations of a floor base material according to the present invention, FIGS. 2 (a) and 2 (b) are production explanatory views of plywood, and FIG. 3 (a). ), (B), FIG. 4, and FIG. 5 are a perspective view for explaining the test, a schematic view, and a hitting point diagram. 1, 2a, 2b, 2c ... Single plate, 2 ... Plywood, 3 ... Damping sheet, a, b, c, d ... Floor base material, A ... Stand.

 ─────────────────────────────────────────────────── ─── 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) Bibliography 53-80911 (JP, U)

Claims (3)

[Claims] 1. A floor base material made of plywood in which a front plate and a back plate are bonded and integrated to the front and back surfaces of a core material, wherein the core material is a single plate obtained by continuously slicing a softwood along the circumferential direction of its outer peripheral surface. The required plates are alternately crossed by 90 degrees at a time so that they are stacked and bonded together, and the front plate and the back plate are
Consists of a veneer obtained by continuously slicing an internode-free raw wood of a coniferous tree along the circumferential direction of its outer peripheral surface, whose fibers are parallel to the short sides of the core, and at least one of the veneers. A vibration-damping floor base material in which a vibration-damping sheet made by binding vulcanized granular rubber with an average particle size of 1.0 to 2.0 mm with a self-melting rubber plastic is intercalated and self-bonded to two overlapping parts. The damping sheet 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 as 100 parts by weight, and 60 to 220 parts by weight of vulcanized granular rubber having an average particle size of 1.0 to 2.0 mm. A damping floor base material characterized by being added with parts. 2. A vibration damping floor base material according to claim 1, wherein equal amounts of vulcanized granular rubber having an average particle diameter of 1.0 to 1.5 mm and 1.6 to 2.0 mm are blended. Floor base material. 3. The damping floor base material according to claim 1, wherein the butyl rubber contains regenerated butyl rubber.