KR102011071B1 - Filter substrate of dry laid thermal bonding nonwoven - Google Patents

Abstract

The present invention relates to a filter support. More particularly, the present invention relates to a dry non-woven fabric thermally-bonded filter support having a structure capable of enhancing filter life by reducing the pressure loss of a filter due to enhanced environmental resistance in harsh environmental conditions. The filter support comprises: a first dry non-woven layer; and a second dry non-woven layer, wherein the first dry non-woven layer has better air permeability than the second dry non-woven layer.

Description

Filter substrate of dry laid thermal bonding nonwoven

The present invention relates to a filter support, and more particularly, to a dry nonwoven thermal fusion filter support having a structure capable of increasing the filter life by improving the pressure loss of the filter by improving the environmental resistance in harsh environmental conditions.

In general, the air filter device is a device for filtering fine dust and foreign matter, is installed in the passage through which the air is introduced and discharged for dust-free dust-proof environment to allow the filtered air to be filtered inside. As the industry develops and environmental pollution increases, the demand for these filter devices is gradually increasing.

These air filters are classified into automotive air conditioner filters, air conditioning air filters, and the like, depending on the intended use.

In particular, the automotive air conditioner filter cleans air by filtering foreign substances such as dust, pollen, automobile smoke, exhaust gas, brake lining dust, and toxic substances contained in the air flowing into the vehicle from the air conditioner or heater of the vehicle or the engine room. Its importance is gradually increasing as it plays a role of influencing the introduction into the

The filter for an automotive air conditioner is composed of a filter support and a dust collecting layer that performs a filtration role. In this case, a heat-sealed dry nonwoven fabric, a spunbond nonwoven fabric, and the like are used as the filter support, and a melt blown nonwoven fabric is mainly used as the dust collecting layer of the filtration role.

On the other hand, such a filter support was initially composed mainly of a single layer structure, but lacked a space for accommodating the dust collected, the disadvantage is often replaced, to improve this, the need for a multi-layered multilayer structure support is increasing.

Recently, the use of a dry nonwoven fabric heat-sealed filter support capable of producing small quantities of multi-products and easy differentiation compared to a spunbond nonwoven fabric has been increasing as a filter support.

However, most of these dry nonwoven thermal fusion filter supports are manufactured using polyester-based low melting point yarns having a melting point of 110 ° C. There is a problem that the life is shortened.

Therefore, in order to increase the life of the filter, the demand for durability in a harsh use environment, that is, the demand for a dry nonwoven fabric heat-sealed filter support with improved environmental resistance is increasing, but the research on this is limited.

Patent Application Publication No. 10-1455362

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a dry nonwoven thermal fusion filter support that can improve the pressure loss of a filter due to improved environmental resistance and increase its filter life despite the harsh environmental conditions in which the filter is used. .

In addition, the present invention solves the problem that the deformation of the material occurs when the conventional filter support is exposed to harsh environmental conditions such as harsh temperature and humidity conditions, the shape stability is poor and the bending portion is deformed to increase the pressure loss. Especially, when the filter is bent and provided in the filter device, the sharpness of the sharpness of the acid portion of the bent portion is deformed in poor environmental conditions, resulting in an increase in pressure loss and thereby a reduction in dust collection. In other words, it can solve the problem of reducing filter life. Accordingly, an object of the present invention is to provide a dry nonwoven thermal fusion filter support that can improve an increase in pressure loss of a filter in harsh conditions.

In order to solve the above problems, the present invention provides a dry nonwoven fabric heat-sealed filter support for forming an air filter together with a dust collecting member, wherein the filter support has a first polyester heat adhesive fiber having a fineness of 6 to 15 deniers and fineness. A first dry nonwoven layer comprising a first olefin thermal adhesive fiber having 6 to 15 deniers; And a second dry nonwoven layer comprising a second polyester thermal adhesive fiber having a fineness of 1.5 to 10 deniers and a second olefin thermal adhesive fiber having a fineness of 1.5 to 10 deniers; and the first dry nonwoven layer Compared to the second dry nonwoven layer, a dry nonwoven fabric heat-sealed filter support having high ventilation is provided.

According to an embodiment of the present invention, the first dry nonwoven fabric and the second dry nonwoven fabric may be combined through thermal fusion between the heat-bonded fibers forming each of the first dry nonwoven fabric and the second dry nonwoven fabric. .

The first polyester thermal adhesive fiber and the second polyester thermal adhesive fiber may include a core part including polyethylene terephthalate and a polyester heat adhesive component having a lower melting point or softening point than the core part. A sheath-core composite fiber formed of a sheath portion, wherein the first olefin-based heat-bonded fiber and the second olefin-based heat-bonded fiber are a core part including polyethylene terephthalate, and an olefin type having a lower melting point or softening point than the core part. It may be a sheath-core composite fiber formed of a sheath portion including a heat adhesive component.

The first dry nonwoven fabric may include a first polyester thermal adhesive fiber and a first olefin thermal adhesive fiber in a weight ratio of 9: 1 to 4: 6, and the second dry nonwoven fabric may include a second polyester thermal fiber. The adhesive fibers and the second olefin-based thermal adhesive fibers may include a weight ratio of 9: 1 to 4: 6.

The filter support may have a basis weight of 40 to 120 g / m 2 and a thickness of 0.2 to 1.0 mm.

In addition, the filter support may have a ventilation of 100 ~ 600ccs.

In addition, the present invention provides a vehicle air filter media comprising a filter support according to the invention and a dust collecting member disposed on one surface of the filter support.

Dry non-woven thermofusion filter support of the two-layer structure according to an embodiment of the present invention is significantly increased dust collection, and even under severe environmental conditions, the shape deformation and pressure loss is improved, resulting in a very extended filter life due to excellent environmental resistance Can have. In addition, the filter support according to an embodiment of the present invention can be provided with more fibers per unit weight by improving the fiber material can further increase the dust collection amount of the filter.

1 is a view showing a configuration according to the manufacturing process of a two-layer dry nonwoven fabric heat-sealed filter support having a filter support bulky layer and a dense layer according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view showing a cross-section of a two-layer dry nonwoven thermal fusion filter support having a bulky layer and a dense layer of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. The drawings and description are to be regarded as illustrative in nature and not restrictive. Like reference numerals designate like elements throughout the specification.

1 and 2, the filter supporter 30 according to the exemplary embodiment of the present invention is disposed on the first dry nonwoven fabric 320 and the first dry nonwoven fabric 320 to be heat-sealed. Dry nonwoven fabric 310 is included. The filter support 30 may include a first process 10 for manufacturing a first dry nonwoven fabric 320, a second process 20 for manufacturing a second dry nonwoven fabric 310, and a manufactured first dry nonwoven fabric 320. ) And the second dry nonwoven fabric 310 may be manufactured through a third process (160, 170, 180).

In the first process 10 for manufacturing the first dry nonwoven fabric 320, the first polyester thermal adhesive fiber and the first olefin thermal adhesive fiber are supplied as yarns through the first material supply unit 110, The different kinds of yarns, which are bundled together from the first material supply unit 110, are mixed with each other by the first material mixing unit 120, and are mixed together by the first material mixing unit 120. The yarn is separated by the first hopper unit 130, and the yarn separated by the first hopper unit 130 is unfolded to a predetermined thickness by the first carding unit 140 to form a thin film, and the The single layered nonwoven fabric layer supplied from the first carding unit 140 may be moved left and right by the first wrapping unit 150 to be stacked in a plurality of layers to form a first dry nonwoven fabric 320 having a predetermined thickness. .

The second process 20 for manufacturing the second dry nonwoven fabric 310 is supplied with a second polyester thermal adhesive fiber and a second olefin thermal adhesive fiber as a yarn through the second material supply unit 210, The different kinds of yarns, which are bundled together from the second material supply unit 210, are mixed with each other by the second material mixing unit 220, and are mixed together by the second material mixing unit 220. The yarn is separated by the second hopper unit 230, the yarn separated by the second hopper unit 230 is unfolded to a predetermined thickness by the second carding unit 240, and formed in a thin film form. The single layered nonwoven fabric layer supplied from the second carding unit 240 may be moved left and right by the second wrapping unit 250 and stacked in a plurality of layers to form a second dry nonwoven fabric 310 having a predetermined thickness. .

Each of the first dry nonwoven fabric 320 and the second dry nonwoven fabric 310 prepared as described above is a second dry type on the first dry nonwoven fabric 320 before entering the drafting unit 160 which is the first step as the third process. The nonwoven fabric 310 may be stacked to form a two-layered nonwoven fabric layer, and then may enter the drafting part 160. Thereafter, the two-layer structure nonwoven fabric is stretched and transferred through the drafting unit 160, and the first dry nonwoven fabric 320 and the second dry nonwoven fabric 310 stretched and transported by the drafting unit 160 are thermally fused. The heat and pressure applied from the coupling unit 170 may be combined by heat fusion with each other and then wound by the winding unit 180.

As the components mentioned in the above-described processes, the material supply unit 110 and 210, the material mixing unit 120 and 220, the hopper unit 130 and 230, the carding unit 140 and 240, the lapping unit 150, 250, the drafting unit 160, the coupling unit 170 and the winding unit 180 may be those included in the conventional apparatus used for the manufacture of dry nonwoven fabric and their lamination, and accordingly in each configuration Detailed description thereof will be omitted.

The first dry nonwoven fabric 320, the second dry nonwoven fabric 310, and the filter support 30 formed by combining them will be described in detail below.

The first dry nonwoven fabric 320 is implemented by including a first polyester-based thermal adhesive fiber having a fineness of 6 to 15 deniers and a first olefinic thermal adhesive fiber having a fineness of 6 to 15 deniers. Compared to the dry nonwoven fabric 310, the bulky property, for example, the density may be small or breathable. The first dry nonwoven fabric 320 is used as a heat-adhesive fiber, a mixture of polyester and olefin-based two other fibers, by using a polyester-based heat-bonding fiber alone by mixing a low specific gravity olefin-based fiber Compared to the accumulation of more heat-bonded fibers per unit weight in the dry nonwoven fabric has a synergistic effect in achieving the object of the present invention, such as improved filtration efficiency, dust collection amount.

First, the first polyester-based heat-bonded fiber is a known fiber called low melting point yarn (or low melting point fiber) or LM (Low Melting) yarn, non-melting point yarn (or non-melting point fiber) having no melting point and softening point. Can be. The heat-adhesive fiber may be employed as a material without limitation when the heat-adhesive component employed in the fiber known for this purpose is a polyester-based component.

The heat-adhesive component provided in the heat-adhesive fiber is manufactured so as to lower the melting point by eliminating any one or more of polyhydric carboxylic acid and diol constituting the polyester, or to remove the melting point and only the softening point, for example, 90 ~ It may be 120 ° C or a component having no melting point and a softening point of 90 to 120 ° C. For example, the heat adhesive component may be modified by replacing a part of terephthalic acid with isophthalic acid and / or a part of terephthalic acid with aliphatic polyhydric carboxylic acid such as adipic acid as an aromatic component of the polyvalent carboxylic acid. In addition, a part of ethylene glycol as a diol is aliphatic diols, for example, 1,4-butanediol, 1,6-hexanediol, 2,2-dimethyl-1,3-propanediol, 3-methyl-1,5- It may be modified by substitution with an aliphatic diol having a side chain such as pentanediol, but is not limited thereto.

The first polyester heat-adhesive fiber is preferably a sheath-core composite having a cross-sectional structure of the heat-adhesive component described above as a sheath portion and a polyester-based component having a higher melting point than the heat-adhesive component as a core portion. Fiber. The core part may be, for example, polyethylene terephthalate. If the first polyester-based heat-bonded fiber is a fiber implemented only with a heat-adhesive component, the first dry nonwoven fabric 320 implemented using the same realizes sufficient bulkiness, thickness, shape stability, and mechanical strength roll at a desired level. It can be difficult to do. The sheath-core composite fiber may be formed of a sheath portion and a core portion in a weight ratio of 6: 4 to 4.5: 5.5, and through this, to achieve the object of the present invention, such as the thickness of the desired non-woven fabric, shape stability May be advantageous.

Next, a description will be given of a first olefin thermal adhesive fiber forming a first dry nonwoven fabric together with the first polyester thermal adhesive fiber.

The first olefin-based heat-adhesive fiber can be used without limitation in the case of known heat-adhesive components in which the heat-adhesive component is an olefin-based. The olefin-based heat adhesive component may be 20 ° C. or more in comparison to the heat adhesive component of the first polyester-based heat adhesive fiber described above as an example, thereby achieving improved heat resistance of the filter support, thereby resulting in poor high temperature. It may be advantageous to improve environmental resistance in the environment. For example, the olefinic heat adhesive component may have a melting point of 125 to 160 ° C. In addition, the olefinic heat adhesive component may be polyethylene having a melting point within the above-described range.

In addition, the first olefin-based heat-adhesive fiber is preferably a sheath-implemented olefin-based heat-adhesive component having the cross-sectional structure as a sheath portion, and a polyester-based component having a higher melting point than the heat-adhesive component as a core portion. It may be a core-type composite fiber. The core part may be, for example, polyethylene terephthalate. If the first olefin-based heat-bonded fiber is a single fiber made of only a heat-adhesive component, the first dry nonwoven fabric 320 implemented by using the first olefin-based heat-bonded fiber has sufficient bulkiness, thickness, shape stability, and mechanical strength roll at a desired level. It can be difficult to do. The sheath-core composite fiber may be formed of a sheath portion and a core portion in a weight ratio of 6: 4 to 4.5: 5.5, and through this, to achieve the object of the present invention, such as the thickness of the desired non-woven fabric, shape stability May be advantageous.

The first dry nonwoven fabric 320 may have a fineness of 6 to 15 deniers, preferably 10 to 15 deniers, of the first polyester thermal adhesive fiber. In addition, the fineness of the first olefin thermal adhesive fiber may be 6 to 15 denier, preferably 6 to 10 denier. If the fineness of the first polyester-based heat-bonding fiber and / or the first olefin-based heat-bonding fiber is less than 6 denier, the first dry nonwoven fabric 320 is implemented to achieve the desired bulkyness, thickness of the desired level It can be difficult. In addition, when the fineness of the first polyester-based heat-bonding fiber and / or the first olefin-based heat-adhesive fiber exceeds 15 denier, there is a problem that the air permeability is excessive, rather deteriorating dust collection efficiency.

In addition, the first polyester thermal adhesive fiber and the first olefin thermal adhesive fiber may be included in a weight ratio of 9: 1 to 4: 6, more preferably 8: 2 to 5: 5, even more preferred. For example, when the weight ratio is 8: 2 to 6: 4, it may be more advantageous to achieve sufficient bulkiness, form stability, thickness, porosity, pore size, etc. as the first dry nonwoven fabric, and the environmental resistance of the filter support implemented through the same. Excellent results in bendability can be obtained. If the first olefin-based heat-adhesive fiber is provided with a weight of less than 1/9 times based on the weight of the first polyester-based heat-adhesive fiber, the bendability before the environmental resistance test is good, but the bending property when used in an extreme environment is good. There can be a significant deterioration. In addition, if the first olefin-based heat-bonded fiber is provided with a weight of more than 1.5 times the weight based on the weight of the first polyester-based heat-bonded fiber when the bendability before and after the environmental resistance test is poor and used in the extreme use environment Environmental resistance due to poor bendability may be significantly reduced.

In addition, the two kinds of fibers included in the first dry nonwoven fabric 320 may each independently have a fiber length of 38 to 64 mm, through which may be more advantageous to achieve the object of the present invention.

On the other hand, according to a preferred embodiment of the present invention, the first polyester-based thermal adhesive fiber and the first olefin-based thermal adhesive fiber has a core portion of the polyester component, for example, a core portion formed of a polyethylene terephthalate component As a composite fiber, both core parts can be the same as polyester, which achieves improved morphological stability after heat fusion, and maintains morphological stability even in high temperature and extreme use environments and minimizes problems such as increased pressure loss. Or there is an advantage that can be prevented.

Next, the second dry nonwoven fabric 310 is implemented by including a second polyester heat adhesive fiber having a fineness of 1.5 to 10 deniers and a second olefin heat adhesive fiber having a fineness of 1.5 to 10 deniers. Compared to the first dry nonwoven fabric 310, it has a dense property, for example, a relatively small air permeability or a large density. The second dry nonwoven fabric 310 is used as a heat-bonding fiber, a mixture of polyester and olefin-based two other fibers, by using a mixture of low specific gravity olefin-based fibers used alone polyester-based heat-bonded fiber Compared to the accumulation of more heat-bonded fibers per unit weight in the dry nonwoven fabric has a synergistic effect in achieving the object of the present invention, such as improved filtration efficiency, dust collection amount.

The second polyester thermal adhesive fiber and the second olefin thermal adhesive fiber are the same as the description of the first polyester thermal adhesive fiber and the first olefin thermal adhesive fiber except for the fineness, and thus a detailed description thereof is omitted. do.

The first polyester thermal adhesive fiber and the second polyester thermal adhesive fiber, and the first olefin thermal adhesive fiber and the second olefin thermal adhesive fiber may have the same cross-sectional structure and thermal characteristics except fineness, but It is not limited.

The second dry nonwoven fabric 310 may have a fineness of 1.5 to 10 denier, preferably 4 to 10 denier, of the second polyester thermal adhesive fiber. In addition, the fineness of the second olefin thermal adhesive fiber may be 1.5 to 10 denier, preferably 2 to 6 denier. If the fineness of the second polyester thermal adhesive fiber and / or the second olefin thermal adhesive fiber is less than 1.5 denier, it is difficult to achieve the desired level of bulkiness and thickness of the second dry nonwoven fabric 310. Can be. In addition, when the fineness of the second polyester thermal adhesive fiber and / or the second olefin thermal adhesive fiber exceeds 10 denier, it is difficult to make the second dry nonwoven fabric 310, which is realized by using it, densely, and the air permeability is large. There may be a problem of lowering the dust collection efficiency.

At this time, the second polyester heat-bonded fiber and the second olefin-based heat-bonded fiber may be selected from the fineness of the fiber is configured such that the second dry nonwoven fabric 310 is a dense layer compared to the first dry nonwoven fabric 320 Can be. For example, both the second polyester thermal adhesive fiber and the second olefin thermal adhesive fiber may be selected to be smaller than the fineness of the first polyester thermal adhesive fiber and the first olefin thermal adhesive fiber. Alternatively, the fineness of the first polyester thermal adhesive fiber and the second polyester thermal adhesive fiber may be the same, but the fineness of the second olefin thermal adhesive fiber may be selected to be smaller than that of the first olefin thermal adhesive fiber. .

In addition, the second polyester thermal adhesive fiber and the second olefin thermal adhesive fiber may be included in a weight ratio of 9: 1 to 4: 6, more preferably 8: 2 to 5: 5, even more preferably For example, when the weight ratio is 8: 2 to 6: 4, the second dry nonwoven fabric may be more advantageous to achieve sufficient density, form stability, thickness, porosity, pore size, etc. Excellent results can be obtained in bendability. If the second olefin-based heat-bonded fiber is provided with a weight of less than 1/9 times based on the weight of the second polyester-based heat-bonded fiber, the bendability before the environmental resistance test is good, but the bendability is remarkably high when used in an extreme environment. It can be bad. In addition, if the second olefin-based heat-bonded fiber is provided with a weight of more than 1.5 times based on the weight of the second polyester-based heat-bonded fiber when the bendability before and after the environmental resistance test is poor and used in the extreme use environment Environmental resistance due to poor bendability may be significantly reduced.

In addition, the two kinds of fibers included in the second dry nonwoven fabric 310 may each independently have a fiber length of 38 to 64 mm, through which may be more advantageous to achieve the object of the present invention.

On the other hand, according to a preferred embodiment of the present invention, the above-described second polyester-based thermal adhesive fiber and the second olefin-based thermal adhesive fiber has a core portion of the polyester-based component, for example a core portion formed of a polyethylene terephthalate component As a composite fiber, the core part of the quantum can be the same as polyester (e.g. PET), which achieves improved morphological stability after heat fusion, and maintains morphological stability and pressure loss even in high temperature and extreme use environments. There is an advantage that can minimize or prevent problems such as increase.

The filter support 30 finally implemented through the first dry nonwoven fabric 320 and the second dry nonwoven fabric 310 may have a thickness of 0.2 to 1.0 mm and a basis weight of 40 to 120 g / m 2. Through the present invention, it is possible to achieve the desired effect more easily, and in particular, in terms of performance as a filter support, even when used in the harsh environmental conditions of extreme temperature and humidity conditions by maintaining a certain level of strength when the basis weight and thickness range There may not be a problem in bendability.

In addition, the filter support 30 preferably has a ventilation of 100 ~ 600ccs. If the air permeability is too small, less than 100ccs, the pressure loss is large and the filter life is reduced. If the air permeability is too large, more than 600ccs, the shape stability of the support may be poor, resulting in poor bendability.

In addition, through the fineness of the constituent fibers of the first dry nonwoven fabric 320 and the second dry nonwoven fabric 310 described above, it is possible to implement a filter support having a two-layer structure capable of lowering the pressure loss and significantly increasing the collection amount.

On the other hand, in recent years, maintaining the performance of the filter in the harsh use environment of the automotive air conditioner filter or air conditioning filter has emerged as an important problem. The demand of the customer to evaluate the performance of such a filter by the following environmental resistance test evaluation is increasing.

Environmental resistance test evaluation evaluates the degree of change in the performance of filter products under low temperature and high temperature and high humidity conditions.The temperature and humidity conditions (80 ℃ ± 5 ℃, 8 hours → 38 ℃ ± 5 ℃) are measured using a constant temperature and humidity chamber. , Relative humidity 90% ± 5%, 8 hours → -40 ℃ ± 5 ℃, 8 hours) is a test to evaluate the increase in pressure loss before and after the filter treatment 2 cycles.

If the environmental resistance is poor under the environmental test conditions described above, the internal structure of the filter support is fused or deformed, which leads to an increase in pressure loss, and thus the shape stability of the filter is poor. In particular, the acid portion of the bent portion of the filter support Sharpness may be deformed to increase pressure loss (or pressure loss) of the filter support.

The filter support according to the present invention has a low pressure loss before and after evaluation, and also has good bendability, so that it is suitable for use in an extreme environment.

On the other hand, the first dry nonwoven fabric 320 and the second dry nonwoven fabric 310 provided in the filter medium 30 described above is environmentally friendly and cost-effective by not using a separate binder or chemical adhesive to combine them Savings can be achieved.

In addition, when the types of the constituent fibers of the first dry nonwoven fabric 320 and the second dry nonwoven fabric 310 are the same, it is easy to bond by heat and pressure, and the heat fusion bonding strength is high, so that the role of the filter support can be remarkably excellent. have.

The filter supporter 30 according to the present invention described above may implement an air filter together with a dust collecting member. The air filter may be, for example, an automotive air filter.

The dust collecting member is excellent in filtration efficiency, so that the MB (Melt blown) is a typical but known dust collecting member can be used without limitation, the present invention is not particularly limited thereto.

Although the present invention will be described in more detail with reference to the following examples, the following examples are not intended to limit the scope of the present invention, which will be construed as to aid the understanding of the present invention.

<Example 1>

H-polyester-based heat-bonding fiber LM (Low Melting) yarn and olefin-based heat-bonding fiber are mixed in a certain ratio, and the basic dry weight of the dry and non-woven fabrics of the first dry nonwoven fabric and the second dry nonwoven fabric having a basis weight of 45g / m2, respectively, and 90g A two-layer dry nonwoven thermal fusion filter support was prepared.

First, the first dry nonwoven fabric is a first polyester heat-bonded fiber, a LM (Low Melting) yarn (H fineness 15 denier, a fiber length of 51 mm, a sheath portion of a polyester component having a melting point of 110 ° C. and a melting point of 260 ° C.). 70 wt% of the sheath-core composite fiber containing the core portion of the phosphorus PET in a weight ratio of 5: 5, and PE / PET olefin thermal adhesive fiber (H fineness 6 denier, fiber length of H company as the first olefin thermal adhesive fiber) The process of FIG. 1 by supplying a sheath portion of 51 mm, a PE having a melting point of 130 ° C. and a sheath-core composite fiber containing a core portion of a melting point of 260 ° C. in a 5: 5 weight ratio by 30 wt% Through a first dry nonwoven fabric having a basis weight of 45g / ㎡ was prepared.

On the other hand, the material of the second dry nonwoven fabric is LM (Low Melting) yarn of H company (10 denier, fiber length 51 mm, sheath part of polyester component having a melting point of 110 ° C. and core part of PET having a melting point of 260 ° C. 5: 60% by weight of the sheath-core composite fiber included in a 5 weight ratio and PE / PET olefin-based heat-bonded fiber of H Company as the second olefin-based heat-bonded fiber (fineness 6 denier, fiber length 51 mm, melting point 130 ℃) The sheath portion of PE and the core portion of PET having a melting point of 260 ° C. were mixed in a weight ratio of 40% by weight of a sheath-core composite fiber containing a 5: 5 weight ratio. A second dry nonwoven fabric was prepared.

Since each of the first dry nonwoven fabric and the second dry nonwoven fabric is laminated before the drafting portion is drawn and conveyed in the drafting portion and combined through the heat of 175 ℃ and 4kg / ㎠ pressure by calendering in the coupling portion Table 1 A filter support such as was prepared.

<Examples 2 to 13, Comparative Examples 1 to 3>

Manufactured in the same manner as in Example 1, except that the fineness and mixing ratio of the fibers constituting the first dry nonwoven fabric and the second dry nonwoven fabric as shown in Table 1 or Table 2 to change the filter support as shown in Table 1 or Table 2 Prepared.

Experimental Example 1

To evaluate the physical properties of the filter support produced through the Examples and Comparative Examples are shown in Table 1 and Table 2.

1) thickness, basis weight

The thickness of the prepared dry nonwoven fabric heat fusion filter support was measured by a thick gauge (MODEL H, PEACOCK, Japan). The average value was obtained by measuring the thickness of a non-woven fabric with a width of 2,000 mm at three points including the center and the middle left and right.

In addition, the weight of the size 50 * 50cm area at the three points in total to obtain a basis weight (g / cm ² ) which is a weight value per unit area.

2) aeration

The air permeability of the prepared dry nonwoven fabric heat fusion filter support was measured by the air permeability meter (MODEL FX-3300, TEXTEST). The air permeability was measured at a total of three points, including the center and center of the 2,000 mm wide nonwoven fabric, and the average value was obtained. The measurement pressure was measured at 125 Pa and expressed in ccs (cm ³ / cm ² / sec).

Experimental Example 2

After the filter support manufactured through the Examples and Comparative Examples, the filter medium was manufactured by hot melt lamination with MB (Melt blown) having a filtration efficiency of 85% of the filtration efficiency for the S company's basis weight of 15 g / m 2 and 0.3 μm particles, It was bent by the method to prepare a filter medium for automotive air conditioners.

Then, to evaluate the physical properties of the prepared filter medium are shown in Table 1 and Table 2.

1) Pressure loss

It was evaluated by the DIN71460 Part 1 method. For mutual comparison, the pressure loss values before and after the environmental resistance test of the filter media at high air flow rate of 600㎥ / hr were compared and the unit was expressed as mmAq.

2) Environmental resistance test

Environmental resistance test is an item evaluating the degree of change in the performance of filter media under low temperature, high temperature and high humidity conditions, and was carried out in accordance with the environmental stability test of SPS-KACA014-144, which is a CABIN filter test method for automobiles. The test filter is exposed to the following cycle conditions. Allow 30 minutes at room temperature between steps.

<1 cycle>

80 ℃ ± 5 ℃, 8 hours → 38 ℃ ± 5 ℃, relative humidity 90% ± 5%, 8 hours → -40 ℃ ± 5 ℃, 8 hours

The test cycle was repeated twice and left for about 5 hours to evaluate the pressure loss before and after the filter treatment.

3) bendability

The sharpness of the bent acid of the filter products, that is, sharpness, was evaluated by three skilled workers with more than three years of experience before and after the environmental test, and when two or more were judged to be good, they were evaluated as good. In other cases, it was evaluated as bad.

4) comprehensive evaluation

When the pressure loss value before and after the environmental resistance test was 16 mmAq or less, the pressure loss increase was 2 mmAq or less, and the bendability was good, it was evaluated as good. If the pressure loss value before and after the environmental resistance test exceeded 16mmAq, the pressure loss increase exceeded 2mmAq, or if the bendability was poor, it was evaluated as defective.

practice
Example 1 practice
Example 2 practice
Example 3 practice
Example 4 practice
Example 5 practice
Example 6 practice
Example 7 compare
Example 1 compare
Example 2 First
deflation
Non-woven First Polyester Thermal Adhesive Fiber Fineness (d) 15 15 10 15 6 10 15 15 - ratio(%) 70 50 70 70 70 70 70 100 - First Olefin Adhesive Fiber Fineness (d) 6 6 10 10 6 6 6 - 10 ratio(%) 30 50 30 30 30 30 30 - 100 2nd
deflation
Non-woven Second Polyester Thermal Adhesive Fiber Fineness (d) 10 10 10 10 6 6 10 10 - ratio(%) 60 50 60 60 60 60 50 100 - Second Olefin Adhesive Fiber Fineness (d) 6 6 6 6 2 4 4 - 6 ratio(%) 40 50 40 40 40 40 50 - 100 filter
Support Thickness (mm) 0.48 0.44 0.45 0.52 0.35 0.38 0.47 0.55 0.42 Aeration (ccs) 250 220 240 290 180 210 230 330 220 Basis weight (g / ㎡) 90 90 90 90 90 90 90 90 90 filter
Media Pressure loss
(MmAq) Before environmental resistance evaluation 12.4 13.3 13.1 11.1 14.1 13.6 12.9 10.9 13.5 After environmental resistance evaluation 13.2 14.3 14.0 12.7 14.8 14.4 13.6 16.8 16.2 Bendability Before environmental resistance evaluation Good Good Good Good Good Good Good Good Bad After environmental resistance evaluation Good Good Good Good Good Good Good Bad Bad Comprehensive Evaluation Good Good Good Good Good Good Good Bad Bad

Example 8 Example 9 Example 10 Example 11 Example 12 Example 13 Comparative Example 3 First
deflation
Non-woven First Polyester Thermal Adhesive Fiber Fineness (d) 15 15 15 15 15 15 6 ratio(%) 88 95 42 30 70 70 70 First Olefin Adhesive Fiber Fineness (d) 6 6 6 6 6 6 2 ratio(%) 12 5 58 70 30 30 30 2nd
deflation
Non-woven Second Polyester Thermal Adhesive Fiber Fineness (d) 10 10 10 10 10 10 4 ratio(%) 60 60 60 60 30 95 60 Second Olefin Adhesive Fiber Fineness (d) 6 6 6 6 6 6 One ratio(%) 40 40 40 40 70 5 40 filter
Support Thickness (mm) 0.53 0.54 0.42 0.40 0.45 0.51 0.30 Aeration (ccs) 290 310 210 200 190 290 130 Basis weight (g / ㎡) 90 90 90 90 90 90 90 filter
Media Pressure loss
(MmAq) Before environmental resistance evaluation 11.5 11.0 13.4 14.2 14.4 12.2 16.9 After environmental resistance evaluation 12.9 13.4 14.2 16.2 16.5 14.6 17.7 Bendability Before environmental resistance evaluation Good Good Good Bad Bad Good Good After environmental resistance evaluation Good Bad Good Bad Bad Bad Good Comprehensive Evaluation Good Bad Good Bad Bad Bad Bad

The dry nonwoven fabric heat-sealed filter support prepared in the embodiments of the present invention can be seen that the increase in pressure loss after the environmental resistance test is not high, the bending property is good, the environmental resistance is good, and the reduction of the filter life can be improved.

On the other hand, the dry nonwoven fabric heat-sealed filter support according to Comparative Examples 1 and 2 of the present invention was found to have a high pressure loss increase after the environmental resistance test of more than 2 mmAq and poor bendability after the environmental resistance test.

In particular, in the case of Comparative Example 2, the bending resistance before and after the environmental resistance test is not good, it can be seen that the high pressure loss before and after the environmental resistance test.

Moreover, in the case of the comparative example 3, the pressure loss value before and after an environmental resistance test exceeded 16 mmAq, and the pressure loss was high, and it evaluated as defect.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments set forth herein, and those skilled in the art who understand the spirit of the present invention, within the scope of the same idea, the addition of components Other embodiments may be easily proposed by changing, deleting, adding, and the like, but this will also fall within the spirit of the present invention.

Claims (7)

An air filter is formed together with a dust collecting member, and in the dry nonwoven fabric heat-sealed filter support manufactured by a card method, the filter support is
The first polyester-based heat-bonded fiber having a fiber length of 38 to 64 mm and a fineness of 6 to 15 deniers and the first olefinic heat-adhesive fiber having a fiber length of 38 to 64 mm and a fineness of 6 to 15 deniers is 9: 1. A first dry nonwoven layer comprising a weight ratio of 4: 6; And
The second polyester thermal adhesive fiber having a fiber length of 38 to 64 mm and a fineness of 1.5 to 10 deniers and the second olefin thermal adhesive fiber having a fiber length of 38 to 64 mm and a fineness of 1.5 to 10 deniers is 9: 1. And a second dry nonwoven layer comprising a weight ratio of 4: 6;
The first dry nonwoven layer is more breathable than the second dry nonwoven layer,
The filter support has a basis weight of 40 ~ 120g / ㎡, the thickness of 0.2 ~ 1.0mm dry nonwoven fabric heat-sealed filter support. The method of claim 1,
The first dry nonwoven fabric and the second dry nonwoven fabric are dry nonwoven fabric heat-sealed filter support, characterized in that the thermal bonding fibers are bonded to each other to form the first dry nonwoven fabric and the second dry nonwoven fabric. The method of claim 1,
The first polyester heat-bonded fiber and the second polyester heat-bonded fiber is a sheath part including a core part including polyethylene terephthalate and a polyester heat adhesive component having a lower melting point or softening point than the core part. Formed sheath-core composite fiber,
The first olefin thermal adhesive fiber and the second olefin thermal adhesive fiber is a sheath formed of a sheath portion comprising a core portion containing polyethylene terephthalate and an olefinic heat adhesive component having a lower melting point or softening point than the core portion. Dry core nonwoven fabric heat fusion filter support, characterized in that the core-type composite fiber. delete delete The method of claim 1,
The filter support is a dry nonwoven fabric heat-sealed filter support, characterized in that the air permeability of 100 ~ 600ccs. A filter support according to any one of claims 1 to 3 and 6; And
Air filter media for automobiles, characterized in that it comprises a dust collecting member disposed on one surface of the filter support.

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