JPH04111849A - Vibration damping floor bed material - Google Patents

Abstract

PURPOSE:To improve damping property without making damping sheets thicker by forming the whole section or partial section of a core member with a particle board, for damping floor bed material using a needle-leaved tree. CONSTITUTION:Front and rear side plates are formed with wooden plate members 1, and between the members 1, via damping sheets 3, the particle board 2 of a core member is placed. On the wooden plate members 1, the veneers 1a, 1b, 1c of each thickness of 1.0mm are heaped up to be bonded to each other and to be integrally formed, and the grains are alternately perpendicular to each other. The single plates 1a, 1b, 1c are formed by slicing the material wood W of a nodeless radiatorpine along the peripheral direction on the outer peripheral surface. In this case, the damping sheets 3 are formed by binding the vulcanized granulated rubber of the average grain size of 1.0-2.0mm with thermal fusion-welding rubber plastics.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a flooring material having a damping effect and made of plywood with a surface free of # (no #) made of coniferous wood.

[Conventional technology and its problems]

High-rise and apartment complexes are being constructed rapidly, and problems caused by vibration noise in neighboring homes are occurring one after another.

As a flooring material that attempts to solve these problems, there is one in which a vibration damping sheet is interposed within plywood in which a front board and a back board are integrally bonded to the front and back surfaces of a core material.

The damping sheet of this product is made of a rubber sheet, a foamed plastic sheet, and felt made by interlacing metal fibers, plastic fibers, animal fibers, and the like.

However, the flooring materials made of the various vibration damping sheets mentioned above are not widely used for boat fishing due to reasons such as not being able to obtain sufficient damping effects or being expensive even if they are obtained. It is.

On the other hand, lauan has been used as raw wood for the above plywood for many years as it has very few knots and is easy to process. Destruction has progressed and it has become an international problem.

Due to this situation, it is becoming difficult to obtain lauan these days, and the price is gradually rising. On the other hand, radiata pine, which is a kind of conifer, is attracting attention.This tree is easy to plant and grows quickly, and according to previous research, it grows to 50 to 60 cm in diameter in 30 years.
It is reported that it will also be. Incidentally, if you compare the prices of lauan and radiata pine, they are about 65:40.

However, radiata pine has short spacing, making it impossible to harvest long, knotless logs like lauan.

According to the research results so far, the heat section length is 7.
0cm or less, 90cm or less in South African products, and 120c+n or less in New Sealant products.

For this reason, the applicant of the present application proposed in Japanese Patent Application No. 1-170734, etc., a conventionally well-known flooring material made of plywood in which a front board and a back board are integrally bonded to the front and back surfaces of a core material, the core material being The required number of veneers made by continuously slicing coniferous wood along the circumferential direction of its outer circumferential surface are stacked and bonded together with their fibers intersecting alternately at 90 degrees, and the top plate and back plate are made of coniferous wood. Consisting of veneers made by continuously slicing knotless logs along the circumferential direction of the outer circumference,
The fibers are parallel to the short sides of the core material, and are arranged in at least one overlapping portion of each veneer with an average grain size of 1.
We have proposed a vibration-damping flooring material in which a vibration-damping sheet made of 0-2.0 mm vulcanized granular rubber bound with heat-fusible rubber plastic is interposed and self-fused.

This vibration-damping flooring material uses coniferous trees that are easy to plant and grow quickly, so forests can be used in rotation every 40 years, and there is no need to worry about resource depletion. Since each plate material is joined, the manufacturing efficiency is good, and due to the presence of granular rubber, the vibration damping properties are also superior to conventional ones.

However, in today's world where people want their own space and time more, it is desired to further improve vibration damping performance in order to secure that space.

The damping properties can be improved by making the damping sheet thicker, but on the other hand, the front and back wooden boards of the flooring material may shift due to the weak pressure resistance of the damping sheet. In other words, tilt deformation is likely to occur.

The present invention takes the above points into consideration and aims to improve vibration damping properties without increasing the thickness of a damping sheet.

[Means to solve the problem]

In order to solve the above-mentioned problem, in the present invention, in the vibration-damping floor base material using the above-mentioned softwood, all or part of the core material is made of particle board.

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

The vulcanized granular rubber preferably has an average particle size of 120 to 150 parts by weight. It is preferable to mix equal amounts of O~1.5 mm and 1.6~2.0 mm.

The above butyl rubber is preferably 30 to 50 parts by weight, and may include 20 to 60 parts by weight, preferably 30 to 50 parts by weight of recycled butyl rubber.

Furthermore, stabilizers such as zinc white, powdered stearic acid, and zinc stearate, processing aids such as paraffin flakes, and processability imparting oil, and fillers may be added to the vibration damping sheet, if necessary.

Furthermore, when the amount of butyl rubber, recycled butyl rubber, and low density polyethylene (LDPE) is less than the above-mentioned amount in the formulation of the vibration damping sheet, the binding of the vulcanized granular rubber becomes poor and the adhesive force at the laminated interface decreases. Moreover, if the amount increases, the inclined deformation due to long-term loads will be large, making it unusable.

In addition, the reason why the particle size of the vulcanized granular rubber is made into two types in the above range is to fill the grain boundaries in a preferable state, and efficiently absorb impact sound (impact vibration) while dispersing and propagating it within itself. This is to make it happen. Moreover, when the particle size becomes large, binding becomes poor and collapse occurs. As the particle size decreases, dispersion propagation and absorption effects decrease.

When the amount of vulcanized granular rubber compounded is large, binding becomes poor. When it is small, vibration absorption effects and deformation due to long-term loads become problems.

Furthermore, bolybdenum, liquid chloroprene, etc. can be added to improve the fusion properties and adhesive properties when interposing the vibration damping sheet on the plywood.

[Effect]

In the present invention configured in this way, the vibration damping and sound absorption properties are improved due to the sound and vibration absorption properties of the particle board.

〔Example〕

An embodiment is shown in FIG. 1, in which the front and back plates are formed of wooden boards 1, and a particle board 2 serving as a core material is interposed between them with a damping sheet 3 interposed therebetween.

As shown in FIG. 2(a), the wooden board 1 has a thickness of 1.0 mm.
It is made by stacking thick veneers 1a, 1b, and 1c and gluing them together to integrate them, and their fibers are alternately crossed at 90 degrees. As shown in Fig. 2(b), the veneers 1a, 1b, and 1c are made of logs of radiata pine in the heated area W
are sliced along the circumferential direction of the outer peripheral surface, so-called ``cutting''.

The particle board 2 is a well-known material made by pressing shavings together with a binder, and has a thickness of 9 to 12 mm. The vibration damping sheet 3 has a kneading composition (a Sb,
c), its thickness is 2.0 mm and 1.6 mm. That is, wood board material 1 (3.0mm), particle board 2 (9mm), vibration damping sheet 3 (2.0+n
m, a % b % C3 types) (Example 1), wood board 1 (3.0 mm), particle board 2 (12 mm), vibration damping sheet 3 (1.6 mm, a %
(Example 2) was manufactured.

The manufacturing conditions are that there is no adhesive in the interposed part of the vibration damping sheet 3;
For adhesion of wood (wood board material 1, particle board 2), use a known adhesive, glue amount: 32 to 39 g/Po, heat pressure temperature: 125°C to 130°C, surface pressure crab 8 to 10 dazzling f/c
J. Heat pressure time: 3.5 to 5 minutes.

In addition, as a comparative example, 15
Structural plywood with m+n thickness was manufactured.

The above Example 1.2 and Comparative Example were prepared according to JIS A 1418.
When the floor impact sound level was measured based on the results, the former was improved by 3 to 14 dB compared to the latter. In particular, there was an improvement effect of 10 to 14 dB in the light impact sound of 250 to 2000 Hz, where impact noise is a problem.

Table 1 (Parts by weight) In addition, regarding Example 1.2, structural plywood class 1 (90° direction) bending test and class 2 bending test were conducted in accordance with the test method of the Japanese Agricultural Standards for structural plywood. The results are shown in Table 2.

This result shows that both examples are satisfactory as structural plywood.

Table n - Number of samples Note that it is not necessary to use particle board 2 for all of the core material, and a portion of the core material is made of coniferous wood similar to the core material of patent application No. 1-1707 '34. It is also possible to make plywood by stacking the required number of sliced veneers so that their fibers alternately intersect at 90 degrees and bonding them together.

〔Effect of the invention〕

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

[Brief explanation of drawings]

FIG. 1 is a partial perspective view of an embodiment of a vibration-damping floor underlayment material according to the present invention, and FIGS. 2(a) and 2(b) are illustrations for explaining the manufacture of a wooden board. 1...Wood board material, 1a, 1b, lc-...-veneer, 2...Particle board, 3...Vibration damping sheet. Patent applicant: TAC Electric Wire Co., Ltd. KEYO Co., Ltd.

Claims (5)

[Claims] (1) In a flooring material made of plywood in which a front board and a back board are integrally bonded to the front and back sides of the core material, the core material is the required number of veneers made by continuously slicing coniferous wood along the circumferential direction of its outer circumferential surface. The fibers are alternately crossed at 90 degrees and stacked, and particle board is bonded and integrated, and the top plate and back plate are made of knotless raw wood taken from the internodes of coniferous trees, and are arranged in the circumferential direction of the outer circumferential surface. consisting of veneers sliced continuously along the core material, the fibers of which are parallel to the short sides of the core material, and at least one overlapping portion of each veneer and particle board has an average grain size of 1.0. ~2.0m
A vibration-damping flooring material comprising a vibration-damping sheet made of vulcanized granular rubber bound with heat-fusible rubber plastic, which is interposed and self-fused. (2) The vibration-damping floor base material according to claim (1), wherein the core material is entirely made of particle board. (3) In the vibration-damping floor base material according to claim (1) or (2), the vibration-damping sheet contains a total of 60 to 90 parts by weight of butyl rubber and 10 to 40 parts by weight of low-density polyethylene.
0 parts by weight, and 60 to 220 parts by weight of vulcanized granular rubber having an average particle diameter of 1.0 to 2.0 mm is added thereto. (4) In the damping flooring material according to claim (1), (2) or (3), the average particle diameter is 1.0 to 1.5 mm and 1.6 to 1.5 mm.
A vibration-damping flooring material characterized by containing an equal amount of 2.0 mm vulcanized granular rubber. (5) The vibration damping floor base material according to claim (3) or (4), characterized in that the damping floor base material contains recycled butyl rubber in the butyl rubber.