JP2006223433A - Sound absorbing carpet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound absorbing carpet showing excellent sound absorbing performance. <P>SOLUTION: In the sound absorbing carpet 10 equipped with an inner fiber base material 13 having a plurality of penetrating holes 16 and a backing layer 15 on the reverse side 11 of a surface fiber base material, the penetrating hole 16 is composed a plurality of frustum parts 16a, 16c of different slanting angles and a plurality of pillar-shaped bodies 16b, 16d of different diameters. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is, for example, a carpet or mat laid on the floor of a vehicle such as an automobile, train or aircraft, a carpet or mat laid on the floor of a building or hallway, a chair mat for computer operation, a room entrance / exit The present invention relates to a floor mat to be laid on a floor, a floor mat to be laid in an elevator or in front of an opening / closing door of an elevator hall, a soundproof carpet applied to an entrance mat, etc. .

  Conventionally, for example, a floor carpet having a felt layer or a non-woven fabric layer and excellent in sound absorption performance is laid on the floor of an automobile.

  On the other hand, the automobile mat placed on the floor carpet is generally composed of a fiber base material in which a pile is driven into a nonwoven fabric and a backing layer formed on the back surface of the fiber base material.

  However, the backing layer in the car mat is made of a synthetic resin such as vinyl chloride resin and functions as a sound insulation layer. When this car mat is placed on a floor carpet, wind noise or the like is generated. Noise from the outside of the vehicle is rebounded by the backing layer of the automobile mat, and sufficient measures have not been taken for noise from outside the vehicle.

  Similarly, for carpets and mats laid on the floors of buildings and corridors, the backing layer on the back of the fiber base is a sound insulation layer, and the noise transmitted from the top surface of the carpet is rebounded. As a result, sufficient sound absorption measures were not taken.

As a result of intensive studies in view of such circumstances, the present inventor has provided a soundproof carpet having further excellent sound absorbing performance. This soundproof carpet is a “soundproof carpet in which a backing layer is formed on the back side of a fiber base material, wherein the soundproof carpet has a number of through holes penetrating the front and back surfaces”. This is a summary (see Patent Document 1, pages 1 to 3 and FIGS. 1 to 3).
JP 2002-238730 A

  The inventor of the present invention relates to a soundproof carpet having a sound absorbing effect in which a large number of through holes penetrating the front and back of the carpet are formed. Further, as a result of earnest studies on a carpet having excellent soundproof performance, the present inventor has completed the present invention. It was.

  That is, the present invention is, for example, a carpet or mat laid on the floor of a vehicle such as an automobile, train or aircraft, a carpet or mat laid on the floor of a building or hallway, a chair mat for computer operation, Floor sound mats installed at doorways, floor mats installed inside elevators and in front of elevator hall doors, and soundproof carpets applied to entrance mats, etc. The first object is to provide the above.

  In order to achieve the above object, the present invention provides a soundproof carpet in which an inner fiber base material having a large number of through holes and / or a backing layer is provided on the back surface of a front fiber base material, wherein the through holes are a frustum portion and a column body portion. The gist is a soundproof carpet characterized by comprising:

  The category of the frustum portion of the through hole of the present invention includes a weight-shaped one. In addition, the category of the through hole according to the present invention includes those composed of a plurality of frustum portions having different inclination angles and a plurality of column body portions having different diameters.

  As described above, the soundproof carpet of the present invention is designed to effectively absorb sound in the process of sound from the carpet upper surface passing through the front fiber substrate, the inner fiber substrate, and / or the backing layer. Further, when the sound that has reached the inner fiber base and / or the backing layer escapes to the back side of the soundproof carpet through the through hole, the collision is repeated on the hole wall surfaces constituting the weight base portion and the column body portion of the through hole. In this process, the sound is further attenuated in the course of repeated collisions, resulting in an excellent sound absorption effect that has never been achieved before.

  Hereinafter, the soundproof carpet of the present invention will be described in detail according to an embodiment shown in the drawings. The soundproof carpet of the present invention is provided with an inner fiber base and / or a backing layer having a large number of through holes on the back side of the front side fiber base. Examples of the front-side fiber base material in the soundproof carpet of the present invention include a nonwoven fabric, a woven fabric, a knitted fabric, paper, or a composite obtained by combining one or more of these. As shown in FIGS. 1 and 6, the pile fiber 12 can be driven into the front side fiber base material 11 so as to have a predetermined volume, thereby improving the design. Since the front-side fiber base material 11 uses a porous material as described above, it is attenuated as frictional heat in the process of sound passing through the front-side fiber base material 11 and is absorbed. Yes.

  Moreover, in the example shown in FIG.1 and FIG.6, a nonwoven fabric, a woven fabric, a knitted fabric, paper, or 1 type or 2 of these is provided through the porous adhesive sheet 14 on the back surface of the front fiber base material 11 which piled the pile yarn 12 An inner fiber base 13 made of a composite in which more than one species is combined is bonded. Since the inner fiber base material 13 is also made of the same porous material as the front fiber base material 11, the inner fiber base material 13 is attenuated as frictional heat in the course of sound passing through the inner fiber base material 13, and absorbs sound. It has come to be.

  The permeable adhesive sheet 14 is made of a spider web-like adhesive and is formed into a thin film by heat and / or pressure during bonding, and a foaming agent is put in an adhesive resin such as a hot melt resin and kneaded. A sheet can be used. In the example shown in FIGS. 1 and 6, the spider web-like adhesive 14 is sandwiched between the front fiber base 11 into which the pile yarn 12 is driven and the inner fiber base 13, and hot pressing is performed. While the base material 11 and the inner fiber base material 13 are bonded, the spider web-like adhesive 14 is formed into a thin film (film) shape by heat and / or pressure during the bonding.

  The permeable adhesive sheet 13 is supported by a porous front-side fiber base material, or a front-side fiber base material and an inner fiber base material, and is placed in a state capable of free vibration. For this reason, the sound transmitted through the front fiber substrate hits the permeable adhesive sheet, and in the process of passing through the pierced hole, the permeable adhesive sheet freely vibrates, and the sound is attenuated and absorbed. It has become. In addition to the functions of adhesion and sound absorption as described above, this permeable adhesive sheet also functions as a pile retaining material when a front fiber substrate into which a pile is driven is used.

  The backing layer is formed on the back surface of the front fiber substrate or the inner fiber substrate for the purpose of reinforcing and retaining the carpet and preventing slipping. In the example shown in FIGS. 1 and 6, the backing layer 15 is made of a foamed resin, and the structure thereof is an open cell structure in which sound and vibration are attenuated in the process of passing sound and vibration through the fine holes. . A large number of spikes 17 for preventing misalignment are formed on the back surface of the backing layer 15.

  Examples of the resin constituting the backing layer include styrene-butanediene-styrene copolymers, acrylonitrile-butadiene copolymers, polymers such as urethane resins, styrene-butanediene rubber, acrylonitrile-butanediene rubber, butane. Examples thereof include rubber polymers such as diene rubber, natural rubber, and isoprene rubber, or a mixture of a plurality of these. Moreover, you may add a filler, a foaming agent, a thickener, and a dispersing agent to the said resin as needed.

  Examples of the filler include sodium polyacrylate, carboxymethyl cellulose, talc, aluminum hydroxide, and antimony oxide. Examples of the foaming agent include fatty acid soap, sodium alkylallyl sulfonate, sodium higher alcohol sulfate, and sodium monoamide disodium N-octadecylsulfosuccinate. Examples of the thickener include polyacrylic acid soda, carboxymethylcellulose, polyvinyl alcohol, casein, and fermented polysaccharides, with low molecular weight sodium polyacrylate being preferred. Examples of the dispersant include sodium tripolyphosphate and sodium hexametaphosphate.

  The inner fiber base and / or backing layer provided on the back side of the front fiber base has a large number of through holes. In the example shown in FIGS. 1 and 6, the inner fiber base 13 and the backing layer 15 are formed with a large number of through holes 16 penetrating them.

  The sound that has passed through the front fiber substrate or the inner fiber substrate reaches the inner fiber substrate and / or the backing layer, and is further attenuated and absorbed in the process of passing through the inner fiber substrate and / or the backing layer.

  The through-hole formed in the inner fiber base and / or the backing layer includes a frustum portion and a column body portion. For this reason, when the sound that has reached the inner fiber base and / or the backing layer enters the through-hole, it repeatedly collides with each hole wall surface constituting the frustum portion and the column body portion of the through-hole. The sound is further attenuated in the process of overlapping collisions, resulting in an excellent sound absorption effect that has never been achieved before.

  The through hole can take a form including a plurality of frustum portions having different inclination angles and a plurality of columnar portions having different diameters.

  For example, the through-hole presses a roll 21 with a pin 22 protruding from the roll surface as shown in FIG. 2 against the inner fiber base and / or the backing layer, and the pin 22 is pressed against the inner fiber base and / or the backing layer. It is perforated by making it penetrate.

  The pin 22 in the roll 21 with a pin shown in FIG.2 and FIG.3 has a shape corresponding to the hole shape of the through-hole 16 shown in FIG. The pin 22 shown in FIGS. 3 (a) and 3 (b) has a conical shape with a frustum portion 22a having an acute inclined surface as a pin top, and subsequently forms a vertical surface that descends vertically from the bottom of the frustum portion 22a. A column body portion 22b, a pedestal portion 22c having an inclined surface that gradually spreads from the lower portion of the column body portion 22b, and a column body portion 22d that subsequently forms a vertical surface that descends vertically from the lower portion of the weight portion 22c. It consists of.

  For example, as shown in FIGS. 1 and 6, the pin 22 penetrates the inner fiber base 13 and the backing layer 15 from the backing layer 15 side, so that the inner fiber base 13 and the backing layer 15 have an opening direction. A columnar portion 16b that has a conical shape with a diameter increasing toward the top and that has a sharply inclined surface at the upper portion of the hole, and a vertical surface that extends vertically downward from the lower portion of the weight table portion 16a. A through hole comprising a frustum portion 16c having an inclined surface that gradually spreads from the lower portion of the column body portion 16b, and a column body portion 16d that forms a vertical surface extending vertically from the lower portion of the frustum portion 16c. 16 is to be perforated.

  In the carpet 10 in which the through holes 16 are thus drilled, the sound reaching the inner fiber base material 13 and the backing layer 15 has a diameter that is different from that of the plurality of frustum portions 16a and 16c having different inclination angles in the through holes 16. Collisions are repeated on the hole wall surfaces constituting the different columnar portions 16b and 16d, and eventually jump out of the opening of the hole. Sound is attenuated in the process of repeated collisions.

  As a form of the through hole of the inner fiber base material and / or the backing layer, a polygonal pyramid shape or a star-shaped pyramid shape having a diameter increasing toward the opening direction can be adopted in addition to the conical shape. The pin 22 shown in FIGS. 4A and 4B has a hexagonal pyramid shape, and has a frustum portion 22a having an acute inclined surface as a pin top, and a vertical surface that descends vertically from the bottom of the frustum portion 22a. Column body portion 22b to be formed, followed by a weight base portion 22c having an inclined surface that gently spreads from the lower portion of the column body portion 22b, and subsequently, a column body portion that forms a vertical surface that descends vertically from the lower portion of the weight base portion 22c. 22d.

  For example, as shown in FIGS. 1 and 6, the pin 22 penetrates the inner fiber base 13 and the backing layer 15 from the backing layer 15 side, so that the inner fiber base 13 and the backing layer 15 have an opening direction. A columnar portion that has a hexagonal pyramid shape with a diameter increasing toward the surface, and has a frustum portion 16a having an acutely inclined surface at the upper portion of the hole, and a vertical surface that descends vertically from the lower portion of the frustum portion 16a. 16b, a penetrating part 16c having an inclined surface that gradually spreads from the lower part of the columnar part 16b, and a columnar part 16d that forms a vertical surface that descends vertically from the lower part of the weighting part 16c. A hole 16 is drilled.

  The pin 22 shown in FIGS. 5A and 5B has a star-shaped cone shape, and has a frustum portion 22a having an acute inclined surface as a pin top portion, followed by a vertical surface vertically descending from the lower portion of the frustum portion 22a. A column body 22b that forms a column, a pedestal 22c having an inclined surface that gradually spreads from the lower portion of the column 22b, and a column that forms a vertical surface that extends vertically from the lower portion of the pedestal 22c. Part 22d.

  For example, as shown in FIGS. 1 and 6, the pin 22 penetrates the inner fiber base 13 and the backing layer 15 from the backing layer 15 side, so that the inner fiber base 13 and the backing layer 15 have an opening direction. A columnar body that has a star-shaped cone shape with a diameter increasing toward the surface, and that has a frustum portion 16a having an acute inclined surface at the upper portion of the hole, and a vertical surface that descends vertically from the lower portion of the frustum portion 16a. A portion 16b, a pedestal portion 16c having an inclined surface that gently spreads from the lower portion of the column body portion 16b, and a column body portion 16d that forms a vertical surface that vertically falls from the lower portion of the weight table portion 16c. A through hole 16 is drilled.

  The scope of the present invention is as defined in “Claims”. For example, a frustum portion having an acute inclined surface from the upper part of the hole, and then a frustum portion having a gentle inclined surface, Next, a column body part that forms a vertical surface that descends perpendicularly from the lower part of the frustum part having a gently inclined surface, and then a through-hole that is provided so that a larger-diameter column body part continues from the lower part of the column body part. All modifications and forms included in the scope of the claims can be adopted.

FIG. 1 is an enlarged perspective view of an essential part of a soundproof carpet according to the present invention. FIG. 2 is a perspective view showing a pin-equipped roll. FIG. 3 is a perspective view showing a pin of a pin-equipped roll or a through hole drilled by the pin. FIG. 4 is a perspective view showing another example of a pin of a pin-equipped roll or a through hole drilled by the pin. FIG. 5 is a perspective view showing another example of a pin of a pin-equipped roll or a through hole drilled by the pin. FIG. 6 is an enlarged cross-sectional view of a main part of the soundproof carpet of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Front side fiber base material 13 ... Inner fiber base material 15 ... Backing layer 16 ... Through-hole 16a ... Weight base part 16b ... Column body part 16c ... Weight base part 16d ... Column body part 22 ... Pin 22a ... Weight base part 22b ... Column body part 22c ... Weight base part 22d ... Column body part

Claims (7)

  A soundproof carpet, wherein an inner fiber base material having a large number of through holes and / or a backing layer is provided on the back side of the front fiber base material, wherein the through holes comprise a frustum portion and a column body portion.   The soundproof carpet according to claim 1, wherein the through-hole is composed of a plurality of frustum portions having different inclination angles and a plurality of column body portions having different diameters.   The soundproof carpet according to claim 1 or 2, wherein the through hole has a conical shape with a diameter increasing toward the opening direction.   The soundproof carpet according to claim 1 or 2, wherein the through hole has a polygonal pyramid shape with a diameter increasing toward the opening direction.   The soundproof carpet according to claim 1 or 2, wherein the through hole has a star-shaped cone shape with a diameter increasing toward the opening direction.   The soundproof carpet according to any one of claims 1 to 5, wherein the backing layer is made of a foamed resin having an open cell structure.   The soundproof carpet according to any one of claims 1 to 6, wherein the backing layer has a large number of spikes.

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