KR20230166875A - Composite structure wood flooring - Google Patents

Abstract

The flooring material of the composite structure according to the present invention includes a surface material made of a decorative board; A top plate layered and bonded to the lower part of the surface material; A cushioning material laminated and coupled to the lower part of the top plate; And it is laminated and coupled to the lower part of the cushioning material, and includes a lower plate, wherein corresponding grooves and protrusions are formed on the side of the upper plate for fitment with different flooring materials arranged during construction, and the surface material and the upper plate are formed. It is a composite flooring material whose average density is greater than the average density of the cushioning material and the lower plate material.

Description

Composite structure wood flooring

The present invention relates to a flooring material with a composite structure. More specifically, it relates to a floor impact sound of an apartment complex, especially an old house, being transmitted in the longitudinal and lateral directions through the difference in specific gravity (density) between the upper part, which is a high-density layer, and the lower part, which is a low-density layer. It relates to a composite flooring material whose structure has been improved to block or reduce (attenuate), while improving resilience and thermal conductivity due to short-term and long-term compression during use.

Most apartments in Korea are essentially wall-type structures, which means that impact noise is transmitted through floors and walls, and the problem of inter-floor noise has been a serious issue for a long time.

Recently, as regulations on housing construction standards have been significantly strengthened or revised, light impact noise must be below 58 (dB) and heavy impact noise must be below 50 (dB) and must be constructed using a standard floor structure determined and announced by the Minister of Construction and Transportation.

Apartment houses, which can be said to be a representative type of housing, are structured so that the walls and floors that make up the house are in contact with the units on the left and right, and the units above and below, so that noise can easily be generated and transmitted through the internal walls, floors, and ceilings. .

As the quality of life improves and residents demand a pleasant living environment for their living space, the frequency of complaints and disputes related to inter-floor noise in apartment complexes is increasing, especially in the case of old houses rather than newly built houses, leading to discord and disputes between neighbors. It is emerging as a social problem, and as a result, floor impact noise reduction has emerged as an important factor in determining residential performance.

Despite the strengthening of related standards as above, conflicts between residents due to noise between floors still persist, and especially in the case of existing and old apartment buildings, disputes and accidents between neighbors due to noise between floors are more serious.

Meanwhile, the development of floor finishing materials with an impact noise reduction effect that satisfies constructability and economic feasibility for field application is still insufficient, and existing prior art literature and market products have insufficient impact noise reduction effects due to the application of cushioning materials, or Due to the increase in unit price, economic feasibility has decreased, making it difficult to apply in practice.

EVA, which is used as a cushioning material for existing flooring, has problems with deterioration due to temperature, PE foam has problems with reduced resilience due to short-term and short-term loads, and problems with causing defects in level differences in flooring materials. In the case of cork, the Due to the high dynamic elastic coefficient, the effect of reducing and absorbing impact noise is insufficient compared to foam cushioning materials, which results in low effectiveness and feasibility. In addition, there is a problem in that it is not economical in terms of unit price and cost to achieve the same performance.

Republic of Korea Patent Publication No. 10-1737404 (Name: Interfloor noise reduction ondol floor; Announcement date: May 19, 2017)

The present invention was created to solve the problems of low economic efficiency, effectiveness, and feasibility of conventional inter-floor noise flooring materials, and is a composite structure improved to reduce floor impact noise and increase vibration damping effects in existing apartments, especially old apartments. The purpose is to provide parquet flooring.

In addition, the purpose of the present invention is to provide a composite flooring material that improves the disadvantage of reduced thermal conductivity from an ondol floor due to a cushioning material used to reduce noise between floors.

The present invention relates to a surface material made of a decorative board; A top plate layered and bonded to the lower part of the surface material; A cushioning material laminated and coupled to the lower part of the top plate; and a lower plate that is laminated and coupled to the lower part of the cushioning material, wherein corresponding grooves and protrusions are formed on a side of the upper plate for fitment with different flooring materials arranged during construction, and the average of the surface material and the upper plate is formed. The density is greater than the average density of the cushioning material and the lower plate, the upper plate is HDF or MDF, the grooves and protrusions are formed in the middle part of the side of the HDF or the MDF, and the upper plate has a thickness of 5.0 to 8.0 mm. And the density of the top plate may be 0.6 to 0.95 g/cm3.

The upper plate of the present invention may be made of a hard, high-density plate, and the lower plate may be made of a soft, low-density plate that is relatively soft and has a lower density than the hard, high-density plate.

The sum of the thicknesses of the cushioning material and the lower plate material of the present invention may be 0.7 to 1.3 times the sum of the thicknesses of the surface material and the upper plate material.

The surface material of the present invention may be any one of HPM, LPM, veneer, and PVC sheet containing melamine.

The thickness of the surface material of the present invention may be 0.2 to 1.2 mm.

The cushioning material of the present invention may be either a foamed synthetic resin material or a foamed viscoelastic resin material.

The foam structure of the cushioning material of the present invention may be composed of a composite structure in which open cells and closed cells are mixed.

The thickness of the cushioning material of the present invention may be 2.0 to 5.0 mm.

The density of the cushioning material of the present invention may be 0.2 to 0.32 g/cm3.

The cushioning material of the present invention may be one to which metal powder is added.

The metal powder of the present invention may be foamed by adding 0.3 to 2.0% by weight of the total cushioning material ratio.

The cushioning material of the present invention may be one to which carbon powder is added.

The carbon powder of the present invention may be foamed by adding 0.5 to 3.0% by weight of the total cushioning material ratio.

The lower panel material of the present invention may be any one of low-density plywood, veneer, and LDF.

The thickness of the lower plate of the present invention may be 1.0 to 5.0 mm.

The density of the lower plate material of the present invention may be 0.25 to 0.40 g/cm3.

The present invention is a flooring material with a composite structure having an upper plate as a high-density upper structure and a lower plate as a low-density lower structure, so that the impact sound generated on the surface is primarily transmitted laterally from the high-density upper plate and reflected upward from the flooring, and secondarily. The effect of reducing inter-floor noise is obtained by absorbing, dispersing and attenuating impact sound in the lower plate including the shock absorbing cushioning material and the low-density lower plate.

In addition, the present invention improves the effect of reducing impact noise by applying the above-described cushioning material, and achieves the effect of maintaining resilience against long-term use load.

In particular, the present invention consists of a flooring material with a composite structure having an upper plate portion as a high-density upper structure and a lower plate portion as a low-density lower structure, so that the impact sound applied to the upper surface of the flooring material is attenuated while passing through a plurality of layers having different densities and specific gravity. This has the effect of minimizing inter-floor noise caused by impact by blocking it from reaching the lower concrete floor.

In addition, the hard structure of the upper plate of the present invention is effective in blocking impact noise in the low frequency band, and the soft structure of the lower plate is effective in blocking impact sound in the high frequency band, thereby reducing floor impact noise by increasing the elastic resilience by increasing the overall thickness compared to existing flooring materials. and the effect of improving the damping action is obtained.

Figure 1 is a perspective view showing the overall configuration of the present invention.
Figure 2 is a perspective view showing the overall configuration in more detail according to an embodiment of the present invention.
Figure 3 is a cross-sectional view showing in detail the overall configuration and laminated structure according to an embodiment of the present invention.
Figure 4 is a perspective view showing the overall configuration in more detail according to another embodiment of the present invention.
Figure 5 is a cross-sectional view showing in detail the overall configuration and laminated structure according to another embodiment of the present invention.
Figure 6 is a plan view showing an example of the fitting groove and protrusion of the present invention and their coupling arrangement.
Figure 7 is a chart comparing the performance of the thermal conductivity of the cushioning material and other materials related to the present invention.
Figure 8 is a graph comparing the performance of the thermal conductivity of the cushioning material and other materials related to the present invention.
Figure 9 is a table showing the thermal conductivity and heat preservation (warmth) state over time of the flooring material of the composite structure to which the cushioning material is applied and the flooring material of the general structure to which the cushioning material is not applied according to the present invention.
Figure 10 is a table showing the durability and resilience of the cushioning material of the present invention.
Figure 11 is a graph showing the recovery rate of the cushioning material in the present invention.
Figure 12 is a table showing the stability of the composite flooring material of the present invention over time after loading on a three-stage pallet.
Figure 13 is a graph showing the restoration rate over time after loading the composite flooring material of the present invention on a three-stage pallet.

Hereinafter, embodiments disclosed in the present specification will be described in detail with reference to the attached drawings. However, identical or similar components will be assigned the same reference numbers regardless of reference numerals, and duplicate descriptions thereof will be omitted. Additionally, in describing the embodiments disclosed in this specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed descriptions will be omitted.

Terms containing ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this application, each step described may be performed regardless of the listed order, except when it must be performed in the listed order due to a special causal relationship.

In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, the present invention will be described with reference to the attached drawings.

As shown in FIGS. 1 to 5, the present invention provides a hard, high-density top plate 110 that primarily transmits and reflects the impact applied to the surface in the horizontal direction and attenuates noise in the high-frequency region; A relatively soft, low-density lower plate 120 that is laminated and coupled to the lower part of the upper plate 110 to secondarily cushion and absorb transmitted shocks and attenuate or eliminate noise in a low-frequency region; The thickness of the upper plate 110 and the lower plate 120 may each account for approximately 50% of the total thickness of the flooring.

Here, in the present invention, the upper plate portion 110 includes a surface material 111 made of a hard, high-density decorative plate; A top plate 112 made of a hard, high-density plate laminated and bonded to the lower part of the surface material 111; It may include.

The surface material 111 of the present invention may be any one of HPM (high pressure thermosetting resin veneer) containing melamine, LPM (low pressure thermosetting resin veneer), veneer, or PVC sheet.

The top plate 112 of the present invention may be high density fiber board (HDF) or medium density fiber board (MDF).

Meanwhile, in the present invention, the lower plate portion 120 includes a soft, low-density cushioning material 121 laminated and bonded to the lower portion of the upper plate portion 110; A lower plate 122 made of a soft, low-density plate laminated and bonded to the lower part of the cushioning material 121; It may include.

The cushioning material 121 of the present invention may be a foamed synthetic resin material.

The cushioning material 121 of the present invention may be a foamed viscoelastic resin material.

The lower plate material 122 of the present invention may be any one of plywood, veneer, and LDF (light density fiber board).

In the present invention, the impact sound generated on the surface is primarily transmitted from the high-density upper plate 110 through a composite flooring structure having an upper plate 110, which is a high-density upper structure, and a lower plate 120, a low-density lower structure. Transmits it laterally and reflects it upward on the floor, and secondarily reduces inter-floor noise by absorbing, dispersing, and attenuating the impact sound in the lower plate 120, which includes the shock absorbing cushioning material 121 and the low-density lower plate 122. It is possible to do so.

Additionally, the present invention can improve the effect of reducing impact noise by applying the cushioning material 121.

In addition, in the present invention, by applying the cushioning material 121, it is possible to maintain resilience against long-term use load.

In particular, the present invention consists of a flooring material of a composite structure having an upper plate portion 110, which is a high-density upper structure, and a lower plate portion 120, a low-density lower structure, so that the impact sound applied to the upper surface of the flooring material has a plurality of different densities and specific gravity. It is attenuated as it passes through multiple layers, blocking it from reaching the lower concrete floor, making it possible to extremely minimize noise between floors due to impact.

In addition, the composite structure having different densities and specific gravity of the hard structure of the upper plate portion 110 and the soft structure of the lower plate portion 120 of the present invention is effective in blocking impact noise in the high frequency band as well as the low frequency band, and thus is effective in blocking impact noise in the high frequency band as a whole. It is possible to improve floor impact sound reduction and attenuation by increasing the elastic resilience by increasing the thickness compared to the flooring material.

Detailed embodiments and operations of the present invention will be described as follows.

First, the present invention basically includes a hard, high-density top plate 110 that attenuates noise in the high-frequency region by first transmitting and reflecting the impact applied to the surface laterally in the horizontal direction, as shown in Figure 1 of the accompanying drawing; A relatively soft, low-density lower plate 120 that is laminated and coupled to the lower part of the upper plate 110 to secondarily cushion and absorb transmitted shocks and attenuate or eliminate noise in a low-frequency region; It is a composite flooring material (100) composed of, and the thickness of the upper plate portion (110) and the lower plate portion (120) each accounts for approximately 50% of the total thickness of the flooring material.

A more specific example includes a surface material 111 made of a decorative plate; A top plate material (112) laminated and bonded to the lower part of the surface material (111); A cushioning material 121 laminated and coupled to the lower part of the upper plate 112; And a lower plate 122 that is laminated and coupled to the lower part of the cushioning material 121, and a side of the upper plate 112 has grooves 112a corresponding to each other for fitting and coupling with different flooring materials arranged during construction. and protrusions 112b are formed, and the average density of the surface material 111 and the upper plate 112 is greater than the average density of the cushioning material 121 and the lower plate 122, and the upper plate 112 is It is HDF or MDF, and the grooves 112a and the protrusions 112b are formed in the middle part of the side of the HDF or the MDF, the thickness of the top plate 112 is 5.0 to 8.0 mm, and the top plate 112 The density of the lower panel 122 is 0.6 to 0.95 g/cm3, and the lower panel 122 is a composite flooring material with a density of 0.25 to 0.40 g/cm3.

Specifically, the sum of the thicknesses of the cushioning material 121 and the lower plate 122 constituting the lower plate 120 is 0.7 of the sum of the thicknesses of the surface material 111 and the upper plate 112 that constitute the upper plate 110. It can be formed from 2 to 1.3 times.

The thickness of the upper plate 110 and the lower plate 120 may be changed in consideration of the type of noise to be reduced and durability.

In the above, the impact is a shock wave including impact noise, and impact force may also be included.

Here, as described above, the upper plate portion 110 of the present invention includes a surface material 111 made of a hard, high-density decorative plate; A top plate 112 made of a hard, high-density plate laminated and bonded to the lower part of the surface material 111; The basic embodiment includes a.

At this time, the surface material 111 of the present invention is presented as an example of any one of HPM (high pressure thermosetting resin veneer) containing melamine, LPM (low pressure thermosetting resin veneer), PVC sheet, and veneer, but is not limited to this. Any hard surface material used as an interior flooring material can be applied.

At this time, in a preferred embodiment, the thickness of the surface material 111 of the present invention is 0.2 to 1.2 mm.

If the thickness is less than the above range, there is a risk that the surface may be easily damaged or worn by external stress such as external shocks and scratches, exposing the top plate 112 of the hip area, and if it exceeds the above thickness range, the surface material 111 may be unnecessarily thick. Due to its use, it acts as a factor in increasing manufacturing costs.

In addition, the top plate 112 of the present invention is preferably made of high density fiber board (HDF) or medium density fiber board (MDF), as shown in FIGS. 2 and 3 of the accompanying drawings.

The HDF is wood made by grinding wood into fine powder, mixing it with adhesive, and stamping it at high temperature and high pressure. It has a higher compression rate and density than MDF, so it is mainly used as a flooring material. It has a density of about 900Kg/m2, and is manufactured at high density, so the wood is Because it is widely used, the amount of bond used is reduced, so it is mostly eco-friendly. Such HDF is harder and heavier than MDF.

As described above, when the top plate 112 is HDF, the manufacturability and workability of the flooring material 100 including the top plate 110 is superior compared to that made of plywood, and when the top plate 112 is made of plywood , Compared to those made of HDF, shock transmission and buffering power to the lateral direction can be increased.

In addition, the top plate 112 of the present invention is preferably made of MDF (Medium density fiber board) as described above.

The MDF is a medium-density (specific gravity is usually 300~700Kg/m2) fiberboard. It is a product made by separating and extracting the cellulose in wood, applying resin, mixing it with an adhesive such as woodworking glue, putting it in a mold, and stamping it under high pressure. The distribution is uniform and the structure is dense, so there is no directionality, the difference in strength in the longitudinal and width directions is less than 10%, and there is no knot corrosion.

In the above, the grooves 112a and the protrusions 112b formed on the side of the upper pan material 112 are preferably formed in opposite directions of the upper pan material 112.

In this way, the groove 112a and the protrusion 112b are formed to face each other on the side of the upper plate 112, so that the protrusion 112b is not damaged even if a large load or impact is applied to the fitting connection formed through them and the groove 112b is not damaged. It is possible to maintain a firmly fitted connection to (112a).

These grooves 112a and protrusions 112b not only function as connecting members of the entire flooring material, but also serve as a medium for transmitting impact noise transmitted to the upper plate 110 to other flooring materials in a continuous connection arrangement.

The above-described top plate 112 is preferably made of plywood as shown in FIGS. 4 and 5 of the accompanying drawings.

This top plate 112 may include a plurality of stacked layers. The top plate 112 formed of such plywood includes a first layer forming the uppermost layer and a second layer forming the lowermost layer. That is, as shown, when the top plate is formed of five layers of plywood, three intermediate layers may exist between the uppermost first layer and the lowermost second layer. In this case, it is preferable that grooves and protrusions for fitting are formed in the three middle layers. This is because if the grooves and protrusions for fitting are located on the uppermost first layer and the lowermost second layer, there is a possibility that they may be damaged by external force.

In the above, the middle layer of the first layer, the second layer, and the middle layer is a thin plate, and the thickness of the upper middle layer laminated between the first layer and the middle layer and the lower middle layer laminated between the second layer and the middle layer are thick. desirable.

The thickness of the top plate 112 of the present invention is 5.0 to 8.0 mm, and the density of the top plate 112 is 0.6 to 0.95 g/cm3. As an example, the average density of the entire upper plate 110 is 0.65 to 1.0 g/cm3.

If the thickness and density of the top plate 112 are below the above range, the durability of the entire flooring material is lowered, the efficiency of blocking impact noise in the low frequency band is lowered, and the thickness and density of the top plate 112 are exceeded. In this case, the walking feeling of the entire flooring deteriorates, and due to exceeding the appropriate ratio of the thickness and density of the lower plate 120, the efficiency of blocking impact sound in the low and high frequency frequency bands is reduced.

At this time, corresponding grooves 112a and protrusions 112b are formed on the thickness surface (side) of the top plate 112 of the present invention for fitting (joining together) with different flooring materials arranged during construction. This is presented as a preferred example.

As described above, the grooves 112a and the protrusions 112b are preferably formed in opposite directions of the upper plate 112.

To illustrate this, as shown in Figure 6 of the attached drawing, when the top plate 112 is a flooring material with a long axis and a short axis with a long vertical length and a short horizontal length, when viewed from a plan view, the groove 112a is It may be formed on the thickness surface (side) of one of the long axes and one of the short axes of the top plate 112. And the protrusion 112b may be formed on the thickness surface (side) of the other one of the long axis and the short axis of the upper plate 112. Therefore, construction is carried out by fitting different flooring materials back, forth, left, and right by the grooves 112a and the protrusions 112b.

At this time, the groove 112a and the protrusion 112b may be formed in the middle layer (three layers) among the five layers constituting the above-described top plate 112, and at this time, between the first layer and the middle layer. It is formed on a portion of the upper intermediate layer, the entire intermediate layer, and a portion of the lower intermediate layer laminated between the second layer and the intermediate layer.

In this way, the groove 112a and the protrusion 112b are formed in the middle layer including the thick upper middle layer and the lower middle layer, so that the protrusion 112b is not damaged even if a large load or impact is applied to the fitting connection portion. The connection can be maintained firmly.

These grooves 112a and protrusions 112b not only function as connecting members of the entire flooring material, but also serve as a medium for transmitting impact noise transmitted to the upper plate 110 to other flooring materials in a continuous connection arrangement.

Meanwhile, in the present invention, the lower plate portion 120 includes a soft, low-density cushioning material 121 laminated and bonded to the lower portion of the upper plate portion 110; A lower plate 122 made of a soft, low-density plate laminated and bonded to the lower part of the cushioning material 121; The basic embodiment includes:

At this time, in a preferred embodiment, the cushioning material 121 of the present invention is a foamed synthetic resin material or a foamed viscoelastic resin material.

In this way, the buffering efficiency can be increased compared to the non-foaming property.

At this time, in an embodiment, the foam structure of the cushioning material 121 of the present invention is composed of a composite structure in which open cells (open cells) and close cells (closed cells) are mixed.

In the above, when the cushioning material 121 is an open cell, the fluidity of air is secured and the inflow and outflow of heat is relatively large compared to a close cell, and when the cushioning material 121 is a close cell, there is no fluidity of air and heat Since inflow and outflow are small, insulation is relatively high compared to open cell. Therefore, the foam structure of the cushioning material 121 of the present invention may be formed as a composite structure in which the above-described open cells and closed cells are mixed, thereby appropriately combining the advantages of the two types.

At this time, the thickness of the cushioning material 121 of the present invention is 2.0 to 5.0 mm, and the density of the cushioning material 121 is 0.2 to 0.32 g/cm3.

If the thickness and density of the cushioning material 121 are less than the above-mentioned range, there is a problem that the durability of the entire flooring material is lowered. On the other hand, when the thickness and density of the cushioning material 121 exceed the above-mentioned range, there is a problem that the absorption efficiency of light impact sound is reduced.

At this time, as an example, a metal powder having a metal vibration damping function is added to the cushioning material 121 of the present invention, and the metal powder is foamed by adding 0.3 to 2.0% of the total cushioning material 121. Presented as an example. Here, the metal powder may be, for example, aluminum powder.

At this time, carbon powder is added to the cushioning material 121 of the present invention as another example, and the carbon powder is foamed by adding 0.5 to 3.0% of the total cushioning material 121. do.

To illustrate in more detail the embodiment of the cushioning material 121 as described above, the aluminum powder added to the cushioning material 121 has a density of 0.4 to 0.8 g/cm3 and a particle size of 50 to 250 μm (micron), and the above ratio and It is added to the cushioning material 121, and the carbon (graphite) powder is added to the cushioning material 121 at the above ratio with a density of 0.2 to 0.7g/cm3, a thermal conductivity of 104 to 175 W/mk, and a particle size of 0.8mm or less. .

With the above mixing and composition, the physical properties of the cushioning material 121 are density 0.2~0.32g/cm3, shore hardness 40~60°, tear strength 0.13~0.18N/mm2, and tensile strength. Results of 700~830KPa and elongation of 90~110% were obtained.

The applied foam cushioning material 121 is made of polyvinyl chloride material with an open cell and closed cell structure, and serves as a sound insulation layer that attenuates floor impact noise by forming an air layer inside.

After setting the floor (base surface) temperature to 70 degrees for the flooring material to which the cushioning material 121 manufactured with the above mixture and composition was applied, the thermal conductivity was measured through the surface temperature change over time. The results are shown in Figures 7 and 8 of the attached drawings. It is the same as the comparison table and graph, and it can be seen that the carbon (graphite)-added cushioning material of the present invention (121) has excellent thermal conductivity under a temperature condition of 70 degrees on the base surface compared to other foam cushioning materials.

In addition, when the present invention is applied to an inter-floor noise floor and compared to a general floor, the thermal conductivity test results of the inter-floor noise floor of the present invention show that the temperature change rate over time under a temperature condition of 50 degrees on the base surface is as shown in Figure 9 of the attached drawing. , The trend of thermal conductivity (temperature rise) over time shows that the temperature rises faster for thin-thick, high-density general floors compared to inter-floor noise floors with inserted cushioning materials, but the temperature difference is not large after 20 minutes or near the target temperature, especially , the heat preservation (warmth retention) results after removing the heat source show that the inter-floor noise floor is superior.

In addition, the present invention as described above was applied to the inter-floor noise floor, and the water resistance adhesion (Boiling Test) was tested according to the KS F 3126 decorated wooden floorboard regulations, and at least 5 specimens (300 x 300 mm) were cut into 75 x 75 mm. , prepared a water-resistant adhesion specimen, immersed the specimen in boiling water (100 degrees) for 4 hours, dried it in a dryer at 60 degrees for 6 hours, and measured the peeled length of the plywood and sheet from the side of the specimen. There were no defects, and a result of less than 25 mm (33%) of the standard total side length was obtained.

In addition, the stability test of the cushioning material was conducted by applying pressure over time, which showed that the resilience of the product was determined by the pressing process during lamination bonding during the product manufacturing process and the concentrated load at the time of shipment after being stacked in three or more layers for a long period of time when storing the product. It can be said to be important.

The results of the durability and resilience test for short-term, concentrated load are as shown in the comparison table and comparison graph of Figures 10 and 11 of the attached drawings, and the stability of the present invention was the best.

In addition, the results of measuring the recovery rate of the product after applying the flooring material to which the cushioning material 121 of the present invention is applied to an inter-floor noise flooring product and loading it in three layers (about 2 tons or more) for 7 days are shown in Figures 12 and 13 in the attached drawings. As shown in the table and graph, it showed a recovery rate performance of 98-99%, showing excellent recovery performance against long-term load compared to PE foam and EVA foam.

In addition, in a preferred embodiment, the lower plate material 122 of the present invention is any one of low-density plywood, veneer, and LDF (light density fiber board).

At this time, the thickness of the lower plate 122 of the present invention is 1.0 to 5.0 mm, and the density of the lower plate 122 is 0.25 to 0.40 g/cm3. As an example, the average density of the entire lower plate 120 of the invention is 0.20 to 0.40 g/cm3.

If the thickness and density of the lower plate 122 are below the above range, the buffering power of the entire flooring is lowered, the efficiency of blocking impact noise in the high frequency band is lowered, and the thickness and density of the lower plate 122 are exceeded. In this case, due to exceeding the appropriate ratio between the thickness and density of the upper plate 120, the efficiency of blocking impact sound in the low and high frequency frequency bands is lowered.

In addition, the present invention presents an example in which the laminated bond between the upper plate 110 and the lower plate 120 and their components is made of adhesive, and aluminum powder is added to the adhesive to improve vibration damping effect and thermal conductivity. It is also possible to transfer the temperature of the lower part of the flooring to the entire surface of the flooring at a uniform temperature by adding carbon powder.

The technical features disclosed in each embodiment of the present invention are not limited to the corresponding embodiment, and unless they are incompatible with each other, the technical features disclosed in each embodiment may be combined and applied to other embodiments.

Therefore, in each embodiment, each technical feature is mainly explained, but unless the technical features are incompatible with each other, they can be applied in combination with each other.

The present invention is not limited to the above-described embodiments and the accompanying drawings, and various modifications and variations will be possible from the perspective of those skilled in the art to which the present invention pertains. Therefore, the scope of the present invention should be determined not only by the claims of this specification but also by equivalents to these claims.

100: Flooring material of composite structure 110: Top plate
111: Surface material 112: Top plate material
120: lower plate 121: cushioning material
122: Bottom plate

Claims (16)

A surface material made of a decorative board;
A top plate layered and bonded to the lower part of the surface material;
A cushioning material laminated and coupled to the lower part of the top plate; and
It includes a lower plate laminated to the lower part of the cushioning material,
On the side of the top plate, corresponding grooves and protrusions are formed for fitting with different flooring materials arranged during construction,
The average density of the surface material and the upper plate material is greater than the average density of the cushioning material and the lower plate material,
The top material is HDF or MDF,
The grooves and protrusions are formed in the middle portion of the side of the HDF or the MDF,
The thickness of the top plate is 5.0 to 8.0 mm,
A composite flooring material with a density of 0.6 to 0.95 g/cm3. According to claim 1,
The top plate is made of a hard, high-density plate,
The lower plate is a composite flooring material made of a soft, low-density plate that is relatively softer and has a lower density than the hard, high-density plate. According to claim 1,
A composite flooring material wherein the sum of the thicknesses of the cushioning material and the lower plate is 0.7 to 1.3 times the sum of the thicknesses of the surface material and the upper plate. According to claim 1,
The surface material is,
Flooring with a composite structure made of HPM, LPM, veneer, or PVC sheet containing melamine. According to claim 1,
A composite flooring material with a thickness of 0.2 to 1.2 mm. According to claim 1,
The cushioning material is,
A flooring material with a composite structure made of either a foamed synthetic resin material or a foamed viscoelastic resin material. According to claim 1,
The foam structure of the cushioning material is a composite flooring material composed of a composite structure of open cells and close cells. According to claim 1,
A flooring material with a composite structure where the thickness of the cushioning material is 2.0 to 5.0 mm. According to claim 1,
A flooring material with a composite structure where the density of the cushioning material is 0.2 to 0.32 g/cm3. According to claim 1,
The cushioning material is,
A composite flooring material with added metal powder. According to claim 10,
The metal powder is,
A flooring material with a composite structure that is foamed with 0.3 to 2.0% by weight of the total cushioning material added. According to claim 1,
The cushioning material is,
A composite flooring material with added carbon powder. According to claim 12,
The carbon powder is,
A flooring material with a composite structure that is foamed with 0.5 to 3.0% by weight of the total cushioning material added. According to claim 1,
The bottom plate is,
A composite flooring material made of low-density plywood, veneer, or LDF. According to claim 1,
A composite flooring material with a thickness of 1.0 to 5.0 mm. According to claim 1,
A composite flooring material wherein the cushioning material and the lower plate have an average density of 0.20 to 0.40 g/cm3.