KR20230174647A - A anti-vibration pad for clothes dryer - Google Patents

Abstract

The anti-vibration pad for a dryer according to the present invention has excellent sound absorption for various types of wavelengths, prevents the transmission of vibration by forming a web with polyester fiber, and secures excellent mechanical properties to prevent damage to the pad due to long-term use. can be suppressed. Additionally, by ensuring sufficient bulkiness, vibration and resulting noise can be greatly reduced.
The anti-vibration pad for a dryer according to the present invention has the above-described characteristics, so it can be used not only as a pad for existing washing machines or dryers, but also as an interior material for vehicles such as cars, airplanes, and ships that require sound absorption and vibration suppression performance, cell phones, etc. It can be widely used as a sound-absorbing material for electronic products such as laptops, computers, and TVs, and as a sound-absorbing material for construction.

Description

Anti-vibration pad for dryer and manufacturing method thereof {A anti-vibration pad for clothes dryer}

The present invention relates to an anti-vibration pad for a dryer and a method of manufacturing the same. Specifically, the present invention relates to an anti-vibration pad for a dryer and a method of manufacturing the same. Specifically, it is installed at both ends of a drum of a dryer for drying laundry and prevents leakage of the supplied hot air when hot air is supplied to the drum for drying laundry. It relates to an anti-vibration pad for a dryer that can achieve wear resistance, impact resistance, and vibration resistance at the same time, and a method of manufacturing the same.

The types of noise sources such as vacuum cleaners, dishwashers, washing machines, air conditioners, air purifiers, computers, projectors, etc. are becoming more diverse, and the noise pollution problem is becoming increasingly serious. Therefore, efforts are continuing to block or reduce noise from various noise sources in modern life, and in developed countries overseas, legal regulations to regulate noise levels between floors and between households in apartments and other apartment complexes are becoming increasingly stringent. .

In particular, a dryer that dries laundry generally has a drum installed inside the drum, and hot air for drying the laundry is supplied to the inside of the drum to dry the laundry. At this time, vibration and vibration generated due to the operation of the drum To prevent noise from leaking out of the device, sealing gasket pads are installed on both ends of the drum. However, in order to prevent vibration and noise transmission of the drum, the thickness of the sound-absorbing material must be thick, but the space where the sound-absorbing material can be located is limited. Because it is limited, there is a need to develop lightweight sound-absorbing materials with improved performance.

There are two ways to improve noise: improving sound absorption performance and improving sound insulation performance. Sound absorption is when the generated sound energy is transmitted through the internal path of the material and is converted into heat energy and dissipated, while sound insulation is when the generated sound energy is transmitted through the internal path of the material. It is reflected and blocked by the shielding material.

Felt, sponge, polyurethane foam, etc. are mainly used as conventional sound-absorbing and sound-insulating materials. In addition, sound-absorbing materials made by impregnating compressed fiber, glass fiber, rock wool, or recycled fiber with thermoplastic resin or thermosetting resin can be listed. You can. However, most of the sound-absorbing materials described above do not have sufficient soundproofing performance, and most of the sound-absorbing materials contain components harmful to the human body.

In addition, in the case of existing sound absorbing materials, a web-type sound absorbing material is disclosed containing more than 10% by weight of general short fibers with a diameter of 10 ㎛ or more that are crimped to general meltblown fibers, and bulky fibers that are crimped to general meltblown fibers are disclosed. A sound absorbing material and thermal insulation material in the form of a web has been disclosed, but the porosity of the web made of general melt blown fibers is very large, so the tissue structure is not dense, the durability of the sound absorbing material is insufficient, and not only does it not provide a sufficient sound absorbing effect, but also does not provide sufficient sound absorbing effect. There is a problem that the thickness of the sound-absorbing material must be greatly increased in order to provide a sound-absorbing effect.

Republic of Korea Patent Publication No. 10-2015-0073768 (July 1, 2015)

The present invention was developed to solve the above problems, and the gasket pad that surrounds and seals the front and rear ends of the drum prevents vibration and noise generated by the drum operation from being emitted outside the device, and at the same time provides wear resistance and durability. The purpose is to provide an anti-vibration pad for a dryer that can achieve impact resistance, etc., and a manufacturing method thereof.

The present invention relates to an anti-vibration pad for a dryer and a method of manufacturing the same.

One aspect of the present invention is,

a) manufacturing a base web by mixing low melting point fiber with polyester fiber and then needle punching to manufacture a primary sound absorbing material;

b) manufacturing a secondary sound absorbing material by laminating a fiber web containing polyester fibers, low melting point fibers, and waste fibers on the primary sound absorbing material and needle punching; and

c) applying heat to the secondary sound-absorbing material to heat-seal it;

It relates to a method of manufacturing an anti-vibration pad for a dryer, comprising:

In the present invention, the base web includes 50 to 80% by weight of polyester fiber and 20 to 50% by weight of low melting point fiber, and the secondary sound absorbing material includes 30 to 50% by weight of primary sound absorbing material and 20 to 40% by weight of polyester fiber. , characterized in that it contains 20 to 40% by weight of low melting point fiber and 10 to 30% by weight of waste fiber.

In addition, the low melting point fiber is a polyolefin-based fiber with a melting point of 20°C or more lower than that of the polyester fiber, and step c) is characterized in that it is carried out at a temperature of 100 to 150°C.

In addition, in the present invention, the waste fiber is characterized in that the fiber length is 1 to 15 cm.

Another aspect of the present invention relates to an anti-vibration pad for a dryer manufactured from the manufacturing method according to the above.

The anti-vibration pad for a dryer according to the present invention has excellent sound absorption for various types of wavelengths, and by forming a web with different types of polyester fibers, it prevents the transmission of vibration and secures excellent mechanical properties, making it suitable for long-term use. Damage to the pad can be prevented. Additionally, by ensuring sufficient bulkiness, vibration and resulting noise can be greatly reduced.

Since the anti-vibration pad for a dryer according to the present invention has the above characteristics, it can be used not only as a pad for existing washing machines or dryers, but also as an interior material for vehicles such as cars, airplanes, and ships that require sound absorption and vibration suppression performance, cell phones, etc. It can be widely used as a sound-absorbing material for electronic products such as laptops, computers, and TVs, and as a sound-absorbing material for construction.

Hereinafter, the anti-vibration pad for a dryer and its manufacturing method according to the present invention will be described in more detail. However, the specific examples introduced below are provided as examples so that the idea of the present invention can be sufficiently conveyed to those skilled in the art.

Therefore, the present invention is not limited to the specific examples presented below and may be embodied in other forms. The specific examples presented below are only described to clarify the spirit of the present invention, and the present invention is not limited thereto.

At this time, if there is no other definition in the technical and scientific terms used, they have meanings commonly understood by those skilled in the art to which this invention pertains, and the following description will not unnecessarily obscure the gist of the present invention. Descriptions of possible notification functions and configurations are omitted.

Additionally, as used in the specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to also include the plural forms, unless the context clearly dictates otherwise.

In the present invention, felt fabric refers to a non-woven fabric manufactured by needle punching, and refers to a fabric manufactured by entangling short fibers or long fibers with a needle. The felt fabric manufactured in this way can secure bulkiness, sound absorption, and shielding properties through various pores, has a simple manufacturing method, and has excellent durability.

The method of manufacturing an anti-vibration pad for a dryer according to the present invention,

a) manufacturing a base web by mixing low melting point fiber with polyester fiber and then needle punching to manufacture a primary sound absorbing material;

b) manufacturing a secondary sound absorbing material by laminating a fiber web containing polyester fibers, low melting point fibers, and waste fibers on the primary sound absorbing material and needle punching; and

c) applying heat to the secondary sound-absorbing material to heat-seal it;

may include.

In the present invention, step a) is a step of manufacturing the primary sound absorbing material, which is a step of mixing polyester fibers with low melting point fibers to produce a base web, and then braiding the base web by needle punching to manufacture it in the form of a felt fabric sheet. .

In the present invention, the polyester fiber is included to secure the mechanical properties of the anti-vibration pad being manufactured. Specifically, it can prevent the transmission of vibration and noise and at the same time strengthen mechanical properties such as tensile strength and tear strength. there is.

In addition, polyester fiber has excellent physical and chemical properties, and its use as an industrial fiber continues to expand. In particular, industrial polyester fiber is widely used as a material for products used in harsh industrial environments, such as safety nets and protection nets at construction sites, ropes for large ships, hoses for automobiles, sewing thread, and seat belts, as well as a variety of leisure and recreational products such as tents and hammocks. It has excellent mechanical and chemical properties so that it can be used in a variety of areas, including sports equipment, and because it is simple and inexpensive to manufacture, highly durable fibers can be easily manufactured.

The polyester fiber varies depending on the monomer, but may be manufactured by condensation polymerization of at least one dicarboxylic acid compound and at least one glycol compound. Preferably, the dicarboxylic acid compound is aromatic, aliphatic, or cycloaliphatic. It may be a dicarboxylic acid, and the glycol compound may be an aliphatic or alicyclic glycol.

Specifically, the dicarboxylic acid compounds include terephthalic acid, isophthalic acid, 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, succinic acid, glutaric acid, adipic acid, sebacic acid, (1,4-, 1,5-, 2,3-, 2,6- or 2,7-)naphthalene dicarboxylic acid, 4,4'-biphenyldicarboxylic acid, 4,4'-dicarboxylic acid Benzyl dicarboxylic acid, etc. may be used, but are not limited thereto. Preferably, terephthalic acid, isophthalic acid, or a mixture thereof is used. The glycol compounds include ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,2-cyclohexanediol, (1,2-, 1,3- or 1,4-)cyclohexanedimethanol, neopentyl glycol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol, etc. can be used, but are limited to these. It doesn't work. Preferably, ethylene glycol, cyclohexanedimethanol, or a mixture thereof is used.

The manufacturing method of the polyester fiber is not limited. Basically, the polyester fiber can be manufactured by performing a polycondensation reaction by esterifying the above components to prepare a composition and then spinning it. At this time, as the polycondensation reaction, known bulk polymerization, solution polymerization, suspension polymerization, etc. can be employed, and the obtained polymer can be used as a spinning sample as is, or can be heat-treated in powder form in an inert gas or under reduced pressure. It can also be used as a sample. Alternatively, it can be used after being granulated once using an extruder.

Additionally, the polyester fiber may, if necessary, contain other polymers or additives (pigment, carbon, heat stabilizer, ultraviolet absorber, lubricant, fluorescent whitening agent, etc.) to the extent that the physical properties of the fiber are not substantially reduced.

The low-melting point fiber is melted through heat treatment and added to increase the bonding force between the polyester fibers and to increase dimensional stability and wear resistance. It is melted through heat treatment and flows between the polyester fibers to bind them together, rather than the polyester fiber. It is preferable to use ingredients with a low melting point.

Specifically, the low melting point fiber preferably includes an olefin resin with a melting point of 20°C or more lower than that of the polyester fiber, and more specifically, metallocene catalyzed linear low density polyester, maleic acid, or maleic anhydride. Preferred are polymerized polyolefins or ethylene-acrylic copolymers, of which metallocene catalyzed linear low density polyesters are most preferred.

As described above, the linear low-density polyester resin is a copolymer of ethylene and alpha-olefin with a low alpha-olefin content, and shows a remarkable tendency depending on the composition ratio, and in particular can control the melting point. For example, a copolymer containing 1.5 mol% of alpha-olefin has a melting point of approximately 120°C, while a copolymer containing 3.5 mol% of alpha-olefin has a melting point of approximately 110°C. Therefore, it is desirable to adjust the amount of alpha-olefin added according to the heat treatment conditions or the amount of low melting point fiber added, which will be described later.

The base web preferably contains 50 to 80% by weight of polyester fiber and 20 to 50% by weight of low melting point fiber. If the content of polyester fiber is less than the above range, the low-melting point fiber melts and completely fills the empty space formed by the polyester fiber, so the sound absorption and vibration absorption performance may be significantly reduced. If the content is more than the above range, the sound absorption and vibration absorption performance may be significantly reduced. As adhesion decreases, mechanical properties such as wear resistance and tensile strength may decrease.

In addition, it is recommended that the polyester fibers and low melting point fibers be surface treated using a spinning emulsion, if necessary, to provide spinning performance to the fibers and improve yarn quality.

In general, in the spinning process of manufacturing yarn by stretching, pulling, aligning, and twisting a mass of fibers, friction is an important factor between the fibers and the contact parts such as metal or rubber that make up the fiber and the spinning machine. Excessive twist is often applied to polyester fibers in the process of forming a web to increase entanglement and reduce surface density. During the needle punching process, the bent fiber mass is stretched and pulled, causing the thread to break. .

In order to solve this problem and further improve the vibration absorption effect and wear resistance of the manufactured pad, the present invention recommends surface treatment with the above-described spinning oil before needle punching the base web.

The spinning oil has the effect of increasing high temperature stability during high-speed spinning and improving cohesion, smoothness, and aging stability, and contains 1 to 10 parts by weight of an alkali metal salt, 10 to 30 parts by weight of a siloxane-based emulsion, and polyol per 100 parts by weight of mineral oil. It is preferable to include 1 to 10 parts by weight and 1 to 5 parts by weight of additives.

The mineral oil is mainly a by-product produced in the process of refining crude oil, and its main components are alkane and paraffin. Examples of these include mineral oil, paraffin wax, petrolatum oil, etc., and are depressurized depending on the degree of the refining process. It may include distilled oil, acid-treated oil, solvent-treated oil, hydrogen-treated oil, white oil, aromatic oil, mixed oil, etc.

The mineral oil is not limited to other physical properties, but it is preferred that the kinematic viscosity is 8 cSt to 96 cSt at 40°C. If the kinematic viscosity is below the above range, lubricity may be insufficient, and if it is above the above range, workability may be poor and easily contaminated due to excessive viscosity.

In the present invention, the alkali metal salt is added to improve antistatic properties, and sodium or potassium salts, especially their stearates, are preferred. The amount added is not limited, but is added at 1 to 10 parts by weight relative to 100 parts by weight of the mineral oil. This ensures sufficient antistatic properties without compromising lubrication, etc.

The siloxane-based emulsion is added to increase smoothness and cohesion. In particular, polydimethylsiloxane significantly lowers the surface tension of the composition, has strong spreadability and permeability, and can form a thin film. By reducing the change in viscosity due to temperature, increasing chemical resistance, and lowering the friction coefficient at the same time, it is possible to achieve the effect of simultaneously increasing friction resistance and vibration resistance.

It is recommended to add 10 to 30 parts by weight of the siloxane-based emulsion based on 100 parts by weight of the mineral oil. If the siloxane-based emulsion is added below the above range, it is difficult to achieve the synergistic effect of friction resistance and vibration resistance described above, and if it exceeds the above range, smoothness and focusing properties may be significantly reduced.

The polyol is added to increase antistatic properties and high temperature stability of the composition, and examples include polyethylene glycol. In particular, the polyethylene glycol is preferred because it can prevent phase separation of the composition over time when the composition is left to stand after mixing.

The molecular weight of the polyol is not limited, but it is preferable to have a weight average molecular weight of 100 to 1,000, and the addition amount is preferably 1 to 10 parts by weight based on 100 parts by weight of the mineral oil to ensure the above-mentioned aging stability.

The additive is added to improve the physical properties of the composition, especially lubricity and heat resistance, and the type is not limited as long as it does not impair the above purpose. Examples of such additives include solvents such as alcohol and water; Alkaline components such as potassium hydroxide and potassium acetate; Fillers such as colloidal silica and titanium dioxide; polyoxyethylene alkyl ether; Emulsions such as rapeseed oil and castor oil; It may include etc.

In particular, it is preferable to use a mixture of talc and silica as the filler. The talc has the effect of reducing friction resistance, and the silica has the effect of increasing wear resistance.

The amount of these additives is not limited, and for example, it is recommended to include 1 to 500 parts by weight of each additive relative to 100 parts by weight of the mineral oil.

In addition, the spinning oil may further include a binder and elastomer particles to absorb shock and vibration and further increase wear resistance.

The binder is added to attach the elastic particles to the surface of the polyester fiber, and is not limited to the type as long as it can be dissolved in the solvent in the composition described above.

Examples of the binder include vinyl alcohol-vinyl acetate copolymer, polyvinyl pyrolidone, polyvinyl alcohol, casein, and soy protein. ), gelatin, and lignin sulphonate, etc., and these may be used alone or in a mixture of two or more.

The binder is preferably polyvinyl alcohol. The polyvinyl alcohol is easily soluble in the above-mentioned solvents and has excellent workability, and because it has excellent chemical stability and insulation, it can serve to hold elastic particles without causing thermal deformation even after repeated friction.

The degree of polymerization of the polyvinyl alcohol is not limited, but it is preferable that the polymerization degree is 2,000 to 3,000 and the weight average molecular weight is 10,000 to 100,000 g/mol so that it can have the above-mentioned physical properties.

It is recommended to add 10 to 30 parts by weight of the binder based on 100 parts by weight of mineral oil. If the binder is added below the above range, the adhesion effect of the elastic body is minimal, and if the binder is added above the above range, workability may be greatly reduced due to increased viscosity of the composition.

In the present invention, the elastic body is added to increase the shock absorption and vibration absorption effects of the pad, and because it is mainly composed of polyurethane, it can exhibit rubber elasticity with excellent elasticity.

The elastomer can be manufactured by a general polyurethane manufacturing method, that is, by polymerizing polyol and isocyanate, and if necessary, the particle size can be adjusted by adding a chain extender for reaction.

At this time, ether-based, ester-based, polycaprolactone-based, and polycarbonate-based polyols can be used as the polyol, and the isocyanate preferably includes para-phenylene diisocyanate. In addition, commonly used chain extenders include 4,4-Methylenebis(2-chloroaniline), 1,4-butanediol, and trimethylolpropane. It is recommended to include one or more of (Trimethylolpropane), m-phenylene diamine, diethyltoluenediamine, and hexamethylenediamine. In addition, the amount of addition is not limited, but polyol and isocyanate are added at a weight ratio of 1:1 to 1.3, and the chain extender is preferably added at 0.1 to 20 parts by weight based on 100 parts by weight of polyol.

The elastic body is preferably added in the form of particles, and the diameter of the particles is not limited, but preferably has a size of 0.1 to 5 mm. In addition, the elastic body preferably contains 10 to 50 parts by weight based on 100 parts by weight of the mineral oil.

The present invention does not limit the application method of the spinning oil. For example, it is preferable to apply the natural fibers by placing them in a bathtub containing the spinning oil composition or by passing the natural fibers through spray droplets of the spinning oil. At this time, it is recommended that the oil content of the spinning oil be 0.5 to 1% (o.p.u, Oil Pick-Up).

Additionally, in the base web according to the present invention, some of the polyester fibers may be replaced with elastic fibers to further enhance wear resistance and vibration resistance.

The elastic fiber has easy moisture absorption, so the effect of strengthening mechanical properties can be obtained. In particular, since the elongation rate increases, the wear resistance and vibration suppression effect can be greatly increased.

Specifically, the elastic fiber is a polyether ester elastomer. After ethylene glycol and butylene glycol, which are the raw materials of the hard segment, are esterified with dimethyl terephthalate in the presence of a catalyst, metal salt and polyester, which is the raw material of the soft segment, are added to this reactant. It can be manufactured by condensation polymerization of glycol.

At this time, copolymerizing an organic sulfonic acid metal salt with a metal salt as the reactant can easily improve the intrinsic viscosity of the polyether ester elastomer, and can also significantly increase the moisture absorption rate and absorption elongation rate of the obtained elastic fiber. Such metal salts may include, for example, germanium compounds, antimony compounds, titanium compounds, cobalt compounds, and tin compounds, but the present invention is not limited thereto.

It is preferable that 30 to 50% by weight of the synthetic fibers out of 100% by weight of the total polyester fibers are replaced with polyetherester elastomer fibers. If the amount of substitution is less than the above range, the vibration suppression effect of the fabric is insufficient, and if it is added in excess of the above range, the elongation of the fabric may increase excessively, which may reduce dimensional stability and shielding properties, and thus the noise shielding effect may be reduced. there is.

In the present invention, the fineness or fiber length of the polyester fiber and low melting point fiber is not limited. For example, it is preferable that the polyester fibers and low melting point fibers that make up the base web have a fiber length of 10 to 100 mm because web formation and entanglement are properly achieved within this range. In addition, a fineness of 1 to 100 denier, preferably 10 to 50 denier, is good because it maintains binding force and allows smooth yarn transfer during carding.

More preferably, it is desirable that the polyester fibers have two or more types of fineness. For example, when two types of polyester fibers of 5 to 10 denier and polyester fibers of 40 to 50 denier are mixed, many pores are formed inside the pad by the relatively thick fibers, and the thick fibers are intertwined with the thin fibers. As it is provided, mechanical properties and sound absorption can be satisfied at the same time.

In the present invention, step a) can be performed using the same method as the general web manufacturing method for needle punching. For example, first, both polyester fibers and low melting point fibers are stored at standard conditions (25℃±3, relative humidity 50 to 60%) for about 24 hours to maintain a constant moisture content, and then the fibers are mixed to produce a web. do.

At this time, the carding process can be manufactured by a normal carding method, but performing the relative humidity at a standard condition can prevent an increase in web heterogeneity due to the generation of floating fibers. Through the carding process, filament-type fibers can be uniformly mixed to form a web.

After forming the base web as described above, the base web is needle punched to form a primary sound absorbing material.

The needle punching is a method of manufacturing non-woven fabric, and is basically recommended to be performed twice: preliminary punching and main punching. In addition, since it is difficult to achieve the desired level of weight at once, the fabric fiber is preferably manufactured by a cross-wrapping method in which the web is laminated several times by changing the lamination direction.

Specifically, the web allows the fiber arrays to intersect perpendicularly or symmetrically. This is to provide uniform properties in various directions, and is more desirable to improve isotropy in combination with the thickness of the fiber layer.

Needle punching is performed by passing a number of needles fixed to a punching head that moves up and down through a guide plate and inside the laminate. At this time, due to the vertical movement of the needle passing through the laminate, the fibers inside the laminate are arranged in the thickness direction and become entangled with fibers of other arrangements, thereby strengthening the bond between the fibers within the fiber layer and at the same time between the fiber layers.

The needle is preferably shaped to have a protruding barb on the side or a fork at the end of the needle, but is not necessarily limited thereto. Preferably, the smaller the fiber diameter, the more advantageous the barb is, and the larger the fiber diameter, the more advantageous the fork. The barb protruding from the side of the needle is small in size, so large-diameter fibers get caught on the barb and are difficult to transport. The fork with a split end of the needle can effectively transport large-diameter fibers, but the fork is applied to small-diameter fibers. It is important to select the needle shape considering the diameter of the fiber because it is easy to cut the fiber during operation.

In the present invention, the needle insertion depth during needle punching refers to the total depth inserted into the fiber layer from the point where the needle meets the fiber layer, and may preferably be 10 mm to 60 mm. If the needle insertion depth is less than 10 mm, the needle punch effect is minimal due to insufficient needle insertion, making it difficult to properly bind the layers. If the needle insertion depth is more than 60 mm, the needle may be dragged excessively deep into the fiber, causing damage or breakage. Problems may arise.

Additionally, the punch density can be adjusted when needle punching. The punch density refers to the number of punches per unit area. By increasing the punch density, the amount of fibers in the thickness direction inside the laminate can be increased, but excessive fiber damage may occur, so it is desirable to adjust the number of punches. The punch density is not greatly limited, but is 10 to 25 penetrations/cm2, and more preferably 15 to 20 penetrations/cm2.

In addition, it is better for the multiple needles fixed to the punching head to have constant spacing between each needle. Preferably, the needle spacing may be between 0.5 mm and 20 mm. If it is outside the above range, the fiber layer may be easily damaged or the interlayer binding effect may not be sufficiently realized.

The thickness of the base web manufactured by needle punching as described above is not limited. However, the base web preferably has an area density of 10 to 500 g/m2, more preferably 50 to 200 g/m2. In particular, it is recommended to optimize the pad by adjusting the areal density according to the size, shape, noise level, etc. of the device to which the pad is applied. If the areal density is less than the above range, there may be a problem of not having mechanical properties such as tensile strength or compression recovery. If it exceeds the above range, it is difficult to control the volume, and sound absorption and vibration suppression performance, especially vibration suppression performance, are greatly reduced.

Next, as in step b), a fiber web containing polyester fibers, low melting point fibers, and waste fibers is laminated on the primary sound absorbing material and needle punching is performed again to produce a secondary sound absorbing material.

The polyester fibers and low melting point fibers of the fiber web laminated in step b) may be the same or similar to the polyester fibers and low melting point fibers used in the primary sound absorbing material described above. That is, not only the fineness and length of the fiber, but also the molecular weight, degree of polymerization, density, melt flow index, and melting point of the low-melting point fiber of the polyester fiber may be the same or similar.

The waste fiber refers to the waste fiber materials generated in the factory during the process of completing textile products through various processes such as textile manufacturing, weaving, dyeing, and sewing. These waste fibers are low in pollution, relatively clean, and are discarded fibers. It is environmentally friendly because it can be recycled.

In addition, the waste fibers vary depending on the fiber length or the amount added to the fiber web, but because they further increase entanglement with other fibers, when added to the fiber web, the mechanical properties of the completed pad can be further improved.

The waste fiber is not limited to its material and includes all natural fibers, semi-synthetic fibers, and synthetic fibers. More preferably, the waste fiber refers to synthetic fiber products generated during the production of textile fabrics, woven materials, non-woven fabrics, or other synthetic fibers that do not meet physical standards and cannot be used as finished products.

The waste fibers are not particularly limited, but in general, waste fibers recovered from waste clothing, waste fabrics, etc. are supplied in a bundled state, so it is preferable to open them after opening them. For this purpose, it is desirable to use a device such as a door opener that can perform both face opening and opening at the same time, or to place a bale breaker and a card machine in succession to open the bale after opening the face.

Additionally, the waste fiber may undergo a process of cutting into a certain size as needed. At this time, the cut length is not limited, but it is preferable that the fiber length is 1 to 15 cm. If the fiber length is less than the above range, the web entanglement rate may decrease and the mechanical properties may decline, and if it exceeds the above range, needle punching may not be performed properly and the mechanical properties may further decline.

In step b), the secondary sound absorbing material preferably includes 30 to 50% by weight of the primary sound absorbing material, 20 to 40% by weight of polyester fiber, 20 to 40% by weight of low melting point fiber, and 10 to 30% by weight of waste fiber. If the composition range is outside the above range, the mechanical properties of the pad may decrease or the sound absorption and vibration suppression performance may be greatly reduced.

In the present invention, the needle punching conditions in step b) are also not limited. However, the secondary sound absorbing material becomes thicker as the fiber web of polyester fiber and low melting point fiber is further laminated compared to the primary sound absorbing material, so during needle punching, the length of the needle, the shape of the barb, the number of barbs, the needle density, It is desirable to adjust the movement speed of the needle, etc., and in particular, it is desirable to adjust the movement length of the needle to 15 to 50 mm so that the fiber web can be sufficiently entangled.

In addition, it is preferable to further include side-by-side type bicomponent yarns separately from the polyester fibers and low melting point fibers included in the fibrous web in step b).

The two-component yarn is added to increase the porosity of the pad and improve sound absorption and vibration absorption performance. The two-component yarn obtained by composite spinning two types of polymers with different melting points or Tg together will be described later due to the different shrinkage characteristics of the polymers. The porosity of the pad can be further increased by developing spiral-like high crimp characteristics during the heat treatment process.

In order to further increase the crimp properties, it is better to spin two types of polymers with different intrinsic viscosity. In particular, it is better to spin two types of polyester polymers with different intrinsic viscosity.

Specifically, among the polyesters, polyester with an intrinsic viscosity of 0.45 to 0.5 is used as the low-viscosity component, and polyester with an intrinsic viscosity of 0.6 to 0.65 and polyester glycol with a degree of polymerization of 600 to 40,000 are used as the high-viscosity component. It is better to use 1 to 15% by weight of copolymerization and modification.

Copolymerizing polyester glycol with a polymer of high viscosity components is to lower the melt viscosity of the high viscosity component. The polyester glycol used at this time has a degree of polymerization of 600 to 40,000 to lower the melt viscosity, and is copolymerized with the polymer of high viscosity components by 1 to 15% by weight. It is desirable to do so.

The bicomponent yarn is preferably included by forming a web with other fibers when manufacturing the secondary sound absorbing material. At this time, the amount added is not limited, but adding 10 to 30 parts by weight compared to 100 parts by weight of the primary sound absorbing material does not harm the mechanical properties of the pad. This is desirable because it can increase sound absorption without sacrificing energy.

Next, as in step c) above, heat can be applied to the secondary sound-absorbing material to melt the low melting point yarn and heat-seal it. At this time, since the temperature may vary depending on the melting point of the low melting point yarn, the heating temperature during heat fusion is not limited, but it is recommended to proceed by applying heat for 10 to 120 seconds within the range of 100 to 150 ℃, more preferably 115 to 125 ℃. . If the temperature is outside the above range, the mechanical properties of the pad may decrease because the low melting point yarn may not melt properly, or melting or thermal decomposition of the polyester fiber may occur and the mechanical properties may also decrease.

The heat fusion process is not limited to any method. For example, the needle-punched sound-absorbing material can be compressed by passing it through a heated roller, or it can be placed in an oven and heated. More preferably, it is better to pass it through a heated roller.

At this time, one or both rollers may be heated. In particular, when all rollers are heated and both sides of the fabric are heat treated, detachment of short fibers that may occur on the fabric surface can be prevented. In particular, since synthetic fibers hold natural fibers due to shrinkage by heat, needle punching The inter-fiber bridging may become more solidified.

The pad manufacturing method according to the present invention may further perform the step of cutting and sewing the secondary sound-absorbing material after heat fusion proceeds as described above, if necessary. At this time, the cutting and sewing can be done by cutting to the required size to have a width for application to a dryer drum and sewing the cut surface.

The cut sound-absorbing fabric is sewn with an elastic band along the longitudinal direction of one edge of the heat-treated surface, and it is preferable to use an elastic band protection member attached to the back side of the elastic band. This means that the material of the elastic band is elastic. In other words, it can be made of any one of elastic rubber, synthetic resin, and silicon. Since these elastic materials are mostly weak in durability, this is to add sturdiness to the elastic band.

In addition, if the elastic band protection member is not adhered to the back of the elastic band, the process of heating and cooling the elastic band is repeated, which not only reduces elasticity, but also causes problems such as cracks or cutting. Therefore, in order to prevent this, it is desirable to use an elastic band protection member attached to the back of the elastic band. In addition, the elastic band protection member is preferably formed of a highly durable mesh-type fiber due to the nature of the structure.

At this time, the reason for using the elastic band is the sealing part of the drum. In other words, it is intended to provide sturdiness to the sound-absorbing material when sealing by wrapping around the outer periphery of the drum, as well as to improve the sealing power of the outer periphery of the drum due to the elasticity of the elastic band. Meanwhile, when sewing the elastic band, it is preferable to sew both edges of the elastic band.

As described above, when an elastic band is sewn along the longitudinal direction of the sound-absorbing material to the edge of one surface of the felt fiber fabric, then a portion of the edge of the other side of the sound-absorbing material to which the elastic band is not sewn is sewn toward the back side of the sound-absorbing material that has not been heat-treated. It is folded and sewn along the longitudinal direction, because the sound-absorbing material is overlapped and sewn to increase the sturdiness of the sound-absorbing material, and in addition, it is a peripheral device of the dryer that is in surface contact with the front/rear ends of the drum. That is, the purpose is to improve the surface contact force with the front supporter and rear supporter.

When the other edge is folded and sewn as described above, the sewn sound-absorbing material is cut to have a length similar to the length of the outer diameter of the drum, and both ends of the cut sound-absorbing material are brought into contact with each other, and then both ends are sewn together. and integrate it.

A method of sewing both ends of a sound-absorbing fabric in butt contact with each other is, as an example of an embodiment, first folding the edges and sewing them several times for a certain width in a continuous direction of the sewn sewing line, and then sewing in a zigzag direction along the butt contact line. When sewing, the reason why the sewing line is repeatedly sewn several times for a certain width in the direction in which the sewing line continues is to prevent the sewing line from unraveling because the sewing line at both cut ends may unravel.

In addition, the reason why the cut ends are brought into butt contact and sewn in a zigzag direction along the butt contact line is to ensure that both sewn ends are flat without any unevenness. For example, if a step occurs at both ends, a problem may occur in which the sealing force is reduced due to the step.

When sewing is completed in the zigzag direction along the butt contact line, the edge where the elastic band is sewn is folded and sewn along the length direction in the direction of the non-heat treated back side, and the edge from the sewing line to the end of the folded edge is sewn on the drum. It is formed into an extension that surrounds the outer diameter.

The reason for forming the extension is to tightly surround the outer diameter of the drum and maintain airtightness. However, it is preferable to use adhesive to secure the inner surface of the extension portion to the outer diameter of the drum.

At this time, the adhesive can be used without limitation as long as it is commonly used in the industry, for example, hot melt adhesive, acrylic type, polyamide type, vinyl chloride + vinyl acetate copolymer, vinyl acetate, ethylene vinyl acetate copolymer rubber type. There are urethane-based and epoxy-based adhesives, and it is preferable to use a two-component curing polyurethane-based adhesive in terms of adhesion, workability, etc.

The amount of application of the adhesive is also not limited. For example, the adhesive can be applied at about 0.1 to 20 g/m2, and is preferred because peeling does not occur and uniform application is possible within this range. In addition, within the above range, it is possible to prevent the adhesive surface from lifting and becoming dirty or the occurrence of bubbles due to slow curing speed.

The present invention may include an anti-vibration pad for a dryer manufactured using the above manufacturing method. The anti-vibration pad for a dryer manufactured by the manufacturing method according to the present invention has excellent sound absorption for various types of wavelengths, prevents the transmission of vibration by forming a web with polyester fiber, and secures excellent mechanical properties for long-term use. Damage to the pad can be suppressed. Additionally, by ensuring sufficient bulkiness, vibration and resulting noise can be greatly reduced.

Since the anti-vibration pad for a dryer according to the present invention has the above characteristics, it can be used not only as a pad for existing washing machines or dryers, but also as an interior material for vehicles such as cars, airplanes, and ships that require sound absorption and vibration suppression performance, cell phones, etc. It can be widely used as a sound-absorbing material for electronic products such as laptops, computers, and TVs, and as a sound-absorbing material for construction.

Hereinafter, the present invention will be described in more detail through examples and comparative examples. However, the following examples are only an example to explain the present invention in more detail, and the present invention is not limited to the following examples.

The physical properties of the specimens prepared through Examples and Comparative Examples were measured as follows.

(tensile strength)

The test was conducted in accordance with the provisions of Article 4.4 of MS 341-09 (2003) of the Korea Apparel Testing & Research Institute. A test piece of 200 The unit was kg/5cm.

(sound absorption)

To measure the sound absorption coefficient, three specimens each applicable to ISO R 354, Alpha Cabin method were prepared, left at an external temperature of 0℃ and 25℃ for 30 minutes, then the sound absorption coefficient was measured, and the average value of the measured sound absorption coefficient was calculated.

(Vibration resistance)

The vibration isolation coefficient was measured according to MS 200-39, and the resonance frequency of the vibration isolation coefficient test was measured secondarily.

(Example 1)

First, to manufacture the primary sound absorbing material, a base web was prepared by carding 70% by weight of polyester fiber and 30% by weight of low melting point fiber (ASPUN XU-61800.34 (Dow 34)). Then, the base web was punched with a needle punching machine to manufacture the primary sound absorbing material.

Next, a mixed web of polyester fiber, low melting point fiber and waste fiber (polyethylene, fiber length 8 cm) is laminated on the primary sound absorbing material, and the ratio of these is primary sound absorbing material: polyester fiber: low melting point fiber and waste fiber. were mixed at a weight ratio of 40:20:25:15 and punched again with a needle punching machine to produce a secondary sound-absorbing material. Then, it was heat treated on both sides with a roller set at 120°C and then cut to produce a pad measuring 20cm wide and 20cm long.

(Example 2)

In Example 1, when manufacturing the secondary sound absorbing material, a polyester homopolymer with an intrinsic viscosity of 0.5 was used as a low-viscosity component, and a copolymer modified by copolymerizing 6% by weight of polyester glycol with an intrinsic viscosity of 0.65 and a degree of polymerization of 4,000 as a high-viscosity component was used. A pad was manufactured in the same manner, except that 20 parts by weight of side-by-side bicomponent yarn compositely spun at a composite ratio of 1:1 was mixed with 100 parts by weight of the primary sound absorbing material.

(Example 3)

A pad was manufactured in the same manner as in Example 1, except that the addition amount of polyester fiber was 90% by weight and the addition amount of low melting point yarn was 10% by weight when manufacturing the primary sound absorbing material.

(Example 4)

A pad was manufactured in the same manner as in Example 1, except that when manufacturing the primary sound absorbing material, the addition amount of polyester fiber was 50% by weight and the addition amount of low melting point yarn was 50% by weight.

(Example 5)

A pad was manufactured in the same manner as in Example 1, except that when manufacturing the secondary sound absorbing material, the primary sound absorbing material: polyester fiber: low melting point fiber and waste fiber were mixed in a weight ratio of 70:15:10:5, respectively.

(Example 6)

A pad was manufactured in the same manner as in Example 1, except that when manufacturing the secondary sound absorbing material, the primary sound absorbing material: polyester fiber: low melting point fiber and waste fiber were mixed in a weight ratio of 25:50:20:5, respectively.

(Example 7)

A pad was manufactured in the same manner as in Example 1, except that the primary sound absorbing material: polyester fiber: low melting point fiber and waste fiber were mixed in a weight ratio of 25:25:45:5, respectively.

(Example 8)

A pad was manufactured in the same manner as in Example 1, except that when manufacturing the secondary sound absorbing material, the primary sound absorbing material: polyester fiber: low melting point fiber and waste fiber were mixed in a weight ratio of 30:20:15:35, respectively.

(Comparative Example 1)

First, to manufacture the primary sound absorbing material, a base web was prepared by carding 70% by weight of polyester fiber and 30% by weight of low melting point fiber (ASPUN XU-61800.34 (Dow 34)). Then, the base web was punched with a needle punching machine to manufacture a sound-absorbing pad.

(Comparative Example 2)

A pad was manufactured in the same manner as in Example 1, except that when manufacturing the secondary sound absorbing material, the primary sound absorbing material and polyester fiber were mixed at a weight ratio of 50:50, respectively.

[Table 1]

As shown in Table 1, the sound-absorbing pad manufactured according to the present invention is manufactured by laminating polyester fiber and low melting point yarn in primary and secondary stages, respectively, and thus has superior performance compared to comparative examples manufactured without single-layer or low melting point yarn. It can be seen that sound absorption and vibration resistance have increased significantly along with tensile strength. Specifically, it can be seen that Example 2, in which more two-component yarn was added to Example 1, maintained mechanical properties and further improved vibration resistance and sound absorption compared to Example 1. This appears to have resulted in further entanglement with other existing fibers as the two-component yarn was crimped by heat treatment, and at the same time, pores were further developed within the pad due to the crimp, further increasing the mechanical properties and vibration resistance.

In addition, Examples 3, 5, and 6, in which the amount of polyester fiber added was out of range, Examples 4 and 7, in which more low melting point yarn was added, and Example 8, in which more waste fiber was added, each showed a decrease in tensile strength and sound absorption coefficient. You can. This means that while the addition of low-melting point yarn further increases the mechanical properties by adhering the fibers in the pad to each other through heat dissolution, the heat-dissolved low melting point yarn fills the pores of the pad, thereby reducing the sound absorption and vibration shielding rates.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also possible. falls within the scope of rights.

Claims (7)

a) manufacturing a base web by mixing low melting point fiber with polyester fiber and then needle punching to manufacture a primary sound absorbing material;
b) manufacturing a secondary sound absorbing material by laminating a fiber web containing polyester fiber, low melting point fiber and waste fiber on the primary sound absorbing material and needle punching; and
c) applying heat to the secondary sound-absorbing material to heat-seal it;
A method of manufacturing an anti-vibration pad for a dryer, comprising:
According to clause 1,
The base web is a method of manufacturing an anti-vibration pad for a dryer, characterized in that it contains 50 to 80% by weight of polyester fiber and 20 to 50% by weight of low melting point fiber.
According to clause 1,
The secondary sound absorbing material is a vacuum prevention for dryer, characterized in that it contains 30 to 50% by weight of primary sound absorbing material, 20 to 40% by weight of polyester fiber, 20 to 40% by weight of low melting point fiber, and 10 to 30% by weight of waste fiber. Pad manufacturing method.
According to clause 1,
A method of manufacturing an anti-vibration pad for a dryer, characterized in that the low melting point fiber is a polyolefin-based fiber with a melting point of 20°C or more lower than that of the polyester fiber.
According to clause 1,
Step c) is a method of manufacturing an anti-vibration pad for a dryer, characterized in that it is carried out at a temperature of 100 to 150 ° C.
According to clause 1,
The waste fiber is an anti-vibration pad for a dryer, characterized in that the fiber length is 1 to 15 cm.
An anti-vibration pad for a dryer manufactured by the manufacturing method according to any one of claims 1 to 6.