KR101026862B1 - A fuel filter for fuel pump of automobile and method of preparing the same - Google Patents

Abstract

The fuel filter for a vehicle fuel pump according to the present invention relates to a fuel filter for a vehicle including a single fiber nonwoven fabric having a multi-layer structure and a support fabric surrounding the same, and a manufacturing method thereof.

The fuel filter for automobile fuel pumps according to the present invention has excellent durability not only for gasoline and diesel oil but also for alcoholic fuels, and is composed of a composite layer, thereby improving performance and extending the life of the filter.

Fuel Filter, Non-Woven, Composite Layer, Nylon, Blend

Description

A fuel filter for fuel pump of automobile and method of preparing the same

The present invention relates to a fuel filter for an automotive fuel pump, and more particularly, to a fuel filter for an automobile including a single-layer nonwoven fabric having a durable durability against alcoholic fuel and a support fabric surrounding the same. It is about a method.

In general, a fuel pump is formed in the fuel tank of the vehicle to supply the stored fuel to the delivery pipe of the engine at high pressure so that the injector can supply fuel into the cylinder. In addition, a lower fuel filter is formed in the lower portion of the fuel pump in order to filter foreign substances mixed with the fuel so as not to be transported into the fuel pump and to prevent failure of the fuel pump due to foreign substances and to prolong the life of the fuel pump.

Fuel filters for automotive engines generally consist of nonwovens and support fabrics. This type of conventional filter material is a non-woven and nylon mesh woven of nylon (nylon) series. fiber) is used. However, in the case of the nylon material, it has been widely used because it has strong durability in alkaline fuels such as gasoline and diesel that have been used in the past, but alcoholic clean fuels such as bioethanol, which are being used recently, show weak acidity, and thus are chemically acidic. Nylon materials with fragile properties could not preserve durability.

In addition, the filter of the nylon mesh fabric of the conventional single layer structure is composed of a thin and dense single layer with a thickness of about 0.5 mm so that the collection efficiency is high, but the impurity holding capacity is low due to insufficient space for collecting impurities. The filter has a short lifespan and a high resistance, thus requiring a large filter area.

In addition, the conventional nylon nonwoven filter has a multi-layered multi-layer structure is designed to increase the effective side and the impurity retention capacity. Its manufacturing process involves loading two or more layers of non-woven webs consisting of synthetic fibers and binding them with a needle punching machine to form voids. Since only the pores are formed to form uniform pores, but the pore sizes are almost uniformly distributed, there is a practical limit to shorten the life of the filtering in a reality in which the size of the impurities to be filtered is different.

Therefore, the existing fuel filter system consisting of a filter support layer and a nonwoven fabric of a nylon-based fabric mesh structure has a problem of poor chemical durability, poor ability to remove impurities, and poor filter life.

The present invention is to solve the conventional problems, one object of the present invention is to produce a filter by mixing a conventional alkali-resistant nylon-based material and acid-resistant polyester-based fiber in the acid and alkali fuels It is to provide a filter that maintains chemical durability.

Another object of the present invention is to provide a fuel filter formed of a composite layer of the filter in order to increase the efficiency of the filter.

Yet another object of the present invention is to provide a fuel filter applicable to a small engine.

One aspect of the present invention is an automotive fuel filter comprising a multi-layered short-fiber nonwoven fabric and a support fabric surrounding it, wherein the nonwoven fabric and the material of the support fabric are polyethylene terephthalate (PET), poly A fuel filter for an automobile, characterized in that at least one of propylene (PP) and polyphenylene sulfide (PPS) or mixed with them and nylon (mixed spinning).

Another aspect of the present invention is to provide a web by using one or more short fibers of polyethylene terephthalate (PET), polypropylene (PP) and polyphenylene sulfide (PPS), or by mixing and spinning them with nylon short fibers. Manufacturing step); Laminating the web prepared in the above step in multiple layers and then entangled with needle punching to form a nonwoven fabric having a multi-layer structure; Wrapping the nonwoven fabric with a support fabric and then heat fusion; It relates to a vehicle fuel filter comprising a.

Yet another aspect of the present invention relates to a fuel filter for a small engine, which is formed by stacking the supporting fabric and the multi-layered short fiber nonwoven fabric and the long fiber nonwoven fabric from the outside.

Fuel filter for automobile fuel pump according to the present invention is excellent in durability and stable to filter even alcoholic fuel that is spotlighted in the environmentally friendly energy age while ensuring stable chemical stability even in alkaline and acidic, and stable use in gasoline and diesel oil. Layered nonwovens and supporting fabrics can improve filter performance and extend filter life through stable pore formation and sizing.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view of a fuel tank having a built-in fuel filter connected to a fuel pump, and FIG. 2 is a cross-sectional view of a fuel filter according to an embodiment of the present invention.

1, the fuel filter 300 for a vehicle fuel pump according to an embodiment of the present invention is formed in the fuel tank 100 in the apparatus for removing foreign matter of the fuel supplied to the fuel pump 200 It is about.

Referring to FIG. 2, an automotive fuel filter 300 according to an embodiment of the present invention includes a single fiber nonwoven fabric 10 having a multi-layer structure and a support fabric 20 surrounding the same. The fuel filter 300 may include a discharge part 30 for discharging fuel to the fuel pump and a frame part 40 for maintaining the shape of the filter.

The material of the short fiber nonwoven fabric 10 and the support fabric 20 is one or more of polyethylene terephthalate (PET), polypropylene (PP), and polyphenylene sulfide (PPS), or a mixture of these and nylon mixed spinning Can be.

The short fiber nonwoven fabric 10 and the support fabric 20 may be 100% polyethylene terephthalate (PET), polypropylene (PP) or polyphenylene sulfide (PPS). In addition, these and nylon may be formed by mixing in a certain ratio.

Blend is a mixture of two or more kinds of hetero fibers to spun, and in the present invention can be blended nylon and the PET, PP or PPS in a certain ratio to form the nonwoven fabric or support fabric.

In the case of the nonwoven fabric, the ratio of the nylon may be blended in a range of 50 to 95 wt%, preferably 60 to 80 wt%. The support fabric may be blended in a proportion of 50 to 90wt%, preferably 60 to 80wt% of the nylon. When the nonwoven fabric and the support fabric are in the above range, there is a strong effect on the alkaline fuel such as gasoline, diesel oil, etc. existing fuel.

One embodiment of the present invention is chemically acid resistant PET (poly Ethylene Thlephtallate (polyester) -based) and PP (Polypropylene), PPS (Poly Phenylene Sulfide) or the like alone or mixed with nylon and alkaline fuel and acid fuel It provides a filter having chemical stability.

FIG. 3 is a schematic view showing three nonwoven webs having different thicknesses of short fibers used in a fuel filter according to one embodiment of the present invention, and FIG. 4 is short fibers having a composite layer structure formed by laminating the webs in FIG. It is sectional drawing which shows a nonwoven fabric.

Referring to FIGS. 3 and 4, the composite layer structure of the nonwoven fabric may have two or more web layers having pores of different sizes. The number of the web layers is not particularly limited, but the composite layer structure may be formed by laminating two to six web layers.

In the above description, the web means that short fibers as a raw material are carded.

In general, nonwoven fabrics are manufactured by the needle punching non woven process, and in particular, even denier single fine material is used to increase web formation and needle punching efficiency of nonwoven fabrics. Nonwovens have good processability and good collection efficiency, but may have a short filter life.

3 and 4, each web layer may have pores of different sizes. The size of the voids may vary depending on the number of web layers, but in the case of three layers, the nonwoven fabric 10 may be formed of the bulky layer 11, the intermediate layer 12, and the dense layer 13 according to the size of the voids from the outside. It may be a layer structure. The pore size may range from 50 to 100 μm in the bulky layer, 20 to 50 μm in the middle layer, and 10 to 20 μm in the dense layer.

In the composite layer structure of the nonwoven fabric 10, each web layer may be formed of short fibers of different sizes. Using short fibers of different sizes makes it easy to control the voids in each web layer. The short fibers can be adjusted according to each web layer between 1 to 15 denier.

The composite layer structure of the nonwoven fabric 10 may have interfiber bonding between each web layer. The multi-layered webs can be laminated and entangled with needle punching to form fiber-to-fiber bonds in each layer so that the layers can be physically bonded together.

The composite layer structure of the nonwoven fabric 10 may have a density gradient between fibers in each web layer and even in one web layer.

Referring to FIG. 3, nylon and PET are mixed in a proportion in a warp and weft yarn, for example, when using a nylon having a density of 1.14 g / m ³ and a PET having a density of 1.38 g / m ³ , therebetween. Since there is a difference in density and there is a difference in blend ratio, density gradients may occur not only in one web layer but also in the entire composite layer.

The composite layer structure of the nonwoven fabric 10 may include a web of three layers of the bulky layer 11, the intermediate layer 12, and the dense layer 13, depending on the size of the void from the outside, but is not limited thereto.

Nonwoven fabric according to one embodiment of the present invention is a multi-layered structure as a composite layer structure, but there is a physical bonding between each layer, each web layer is formed of short fibers of different sizes and nylon and PET when the density between each fiber is mixed There is a difference.

The composite layer structure is a structure in which each web layer is formed into non-uniform voids to extend the life of the filter, and density gradient exists between each web layer and even within one web layer to improve the trapping efficiency of impurities.

In another aspect, an embodiment of the present invention relates to a fuel filter for a small engine, which is formed by stacking the supporting fabric and the multi-layer non-woven fabric and the long-fiber nonwoven fabric from the outside in the order.

The long fiber nonwoven fabric may have a pore size of 10 μm or less.

The long fiber nonwoven fabric may be a melt brown sheet or a spun bond sheet.

Since the long fiber nonwoven fabric is manufactured in the form of a film by spinning and stacking the long fibers unlike the short fiber nonwoven fabric, since the long fiber nonwoven fabric can form compact pores according to the fineness, and the size of the pores can be uniformly manufactured, Used for manufacturing.

Since the filter for a small engine according to an embodiment of the present invention may be composed of four or five layers, it is possible to extend the life of the filter as much as possible while improving the filtering performance.

In another aspect, the present invention relates to a method for manufacturing a fuel filter for an automobile. The manufacturing method uses a single fiber of one or more of polyethylene terephthalate (PET), polypropylene (PP) and polyphenylene sulfide (PPS) or mixed spinning these and nylon short fibers (mixed spinning) to form a web (web) Manufacturing step; Laminating the web prepared in the above step in a multi-layer and forming a non-woven fabric having a multi-layer structure by needle punching; Wrapping the nonwoven with a support fabric and then thermally fusion bonding.

Web manufacturing stage

The step is to use a single fiber of one or more of polyethylene terephthalate (PET), polypropylene (PP) and polyphenylene sulfide (PPS) or mixed spinning these and nylon short fibers (mixed spinning) to produce a web (web) It's a step.

In the case of the nonwoven fabric may be mixed by adjusting the ratio of the nylon to 50 ~ 95wt%. The support fabric can adjust the ratio of the nylon to 50 ~ 90wt%.

In this step, it is possible to produce a web of two or more layers, preferably two to six layers, having a web layer having pores of different sizes.

In the above step may be added to the different size of short fibers in the manufacturing of each web layer. Using short fibers of different sizes makes it easy to control the voids in each web layer. The size of the short fibers can be adjusted according to each web layer between 1 to 15 denier.

Nonwoven Fabric Forming Step

The step is a step of forming a non-woven fabric of a multi-layer structure by needle punching the web prepared in a multi-layer.

In general, the nonwoven fabric may be manufactured by a needle punching non woven method.

This step produces interfiber bonding between each of the web layers. The multi-layered webs can be laminated and entangled with needle punching to form fiber-to-fiber bonds in each layer so that the layers can be physically bonded together.

In the above step, when each web layer has three layers having pores of different sizes, the web layer may be laminated into three layers of a bulky layer, an intermediate layer, and a dense layer according to the size of the pores from the outside, and then the binding between the fibers may be formed by needle punching. .

The heat fusion step is a step of manufacturing a fuel filler for automobiles by wrapping the non-woven fabric with a support fabric and then heat fusion. The heat fusion step can be carried out without any limitation using known methods.

Hereinafter, a method of forming a nonwoven fabric having a three-layer structure of a bulky layer, an intermediate layer, and a dense layer will be described in more detail.

In manufacturing a three-layer nonwoven fabric used as an automobile filter according to an embodiment of the present invention, the first layer is a dense layer by mixing the nylon 1-1.5den and PET 1-1.5den short fibers to form a web The second layer was made of nylon 2-3den and PET 2-3den to prepare the intermediate layer web, and the third layer was formed of bulky web using nylon 3-5den and PET 3-5den. After lamination, a nonwoven fabric having a three-layer structure was prepared after needle punching.

One embodiment according to the present invention was prepared by blending nylon and PET-based fibers with type 1 having a good alkali resistance and acid resistance, and a type 2 applying a material having excellent alkali resistance and acid resistance as a single material such as polypropylene and PPS.

In the case of Type 1, nylon and polyester materials are mixed at a wt% ratio of 5: 5, 6: 4, 7: 3, and 8: 2, respectively, to prepare a nonwoven fabric, and applied to an automotive engine to evaluate acid resistance and alkali resistance. One result is shown in Table 1.

At this time, the nylon and polyester short fibers used in the nonwoven fabric was used 1.5-3den grade.

Table 1 shows the chemical durability according to the mixing ratio of nylon vs PET. As can be seen from Table 1, when the ratio of nylon is increased, acid resistance is weakened, and alkali resistance is increased. Therefore, in the case of gasoline and diesel oil, which are conventional fuel systems, it is slightly alkaline, so it is appropriate to use nylon-based materials. However, bioethanol, which is a clean fuel, has a weak acidity, and thus the chemical safety is higher when more polyester-based raw materials are included.

In the case of type 2, polypropylene and PPS are both polyolefin-based resins, which are excellent in acid resistance and alkali resistance. Thus, even when used alone, they are very resistant to gasoline and diesel, which are existing fuel systems. It can be seen that the chemical durability of the fuel is very strong.

In addition, in the case of Type 1, if the thickness of the short fibers is applied, the size of the pores can be adjusted and the filtering capacity can be extended, thereby extending the life of the filter. In more detail, when the nylon and polyester are mixed in a certain ratio, the size of the pores can be adjusted and pore generation of various sizes can eventually increase the filtering efficiency.

In the case of Type 2, the thickness of a single material is different for each web layer, that is, when the fiber is manufactured using 1-2den, 2-4den, 3-7den, etc. A layered nonwoven fabric was produced.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the following Examples are for illustrative purposes only and are not intended to limit the present invention.

Example 1

The short-fiber nonwoven fabric layer was prepared as a three-layer web structure in which nylon and PET were mixed as shown in Table 2 below, and the mesh fabric, which is a support fabric, was made of nylon and PET crosslinked fabric, was thermally fused with the short-fiber nonwoven fabric, and then laminated. A filter was obtained.

Supporting fabric: Slant (nylon, PET) 20den mono filament, weft 20den mono filament, 1: 1 weaving fabric (nylon: PET)

Nylon and PET short fibers of the composition and thickness were sufficiently mixed to be evenly mixed in the above ratio, and then put into each carding machine to perform carding to obtain three web layers.

The carding machine is a machine that owes finely the raw fiber, so that the carding is good so that the uniformity of the product is excellent and there is no deviation of the product after the product is manufactured.

 Each web exiting the carding machine was laminated, and three layers of webs were put into a needle punching machine to bind the fibers to obtain a nonwoven fabric. Next, the upper and lower portions of the nonwoven fabric were wrapped with the support fabric, and then thermally fused with a high frequency heat welding machine to manufacture a fuel filter for an automobile.

Example  2

Using a single-fiber nonwoven fabric as a single material of polypropylene (PP) (Kolon Glotech, 1,2,4 den, 51mm), a nonwoven fabric having a three-layer structure having different pore sizes under the conditions shown in Table 3 below was prepared. It was laminated with a PP mesh fabric and heat-sealed to obtain an automotive fuel filter.

Support fabric: high density fabric with PP warp 50den, weft 210den

Example  3

The short fiber nonwoven fabric is made of polyphenylene sulfide (PPS) (Korea Engineering Plastics) as a single material, and a nonwoven fabric having a three-layer structure having different pore sizes is prepared under the conditions shown in Table 4, and then laminated with a PP mesh fabric as a supporting fabric. Heat-sealed to obtain an automotive fuel filter.

Support fabric: high density fabric using PPS warp 50den, weft 50den

Comparative example  One

The short fiber nonwoven fabric was made of 100% nylon (Sewon, 2den), and the thickness of the short fiber was made constant to 2den to form a web of two layers, and this was put into a needle punching machine to form a nonwoven fabric. The nonwoven fabric was laminated with a nylon mesh fabric as a support fabric and thermally fused to obtain a fuel filter for automobiles.

Examples 1 to 3 and Comparative Example 1 were exposed to conventional fuels and alcoholic fuels to evaluate chemical resistance, and the chemical durability and filtering effect and extended filter life in a pilot plant were similar to those of fuel tanks that are actually driven by automobiles. The evaluation thereof is shown in Table 5.

Referring to Table 5, Examples 1 to 3 were found to have superior chemical resistance to the affinity fuel system compared to Comparative Example 1, and also in the case of Examples 1 to 3 were also durable against the existing gasoline or diesel oil. This is excellent and the filter life is also increased.

1 is a schematic view of a fuel tank with a built-in fuel filter connected to a fuel pump.

2 is a cross-sectional view of a fuel filter for an automobile according to an embodiment of the present invention.

3 is a schematic view showing three nonwoven webs having different thicknesses of short fibers used in the fuel filter according to one embodiment of the present invention.

4 is a cross-sectional view showing a short fiber nonwoven fabric having a composite layer structure after laminating the web of FIG. 3.

* Description of the main parts of the drawings

100: fuel tank 200: fuel pump

300: fuel filter

10: short fiber nonwoven fabric of composite layer structure 20: support fabric

30: discharge part 40: frame

Claims (13)

 A fuel filter for automobiles comprising a multi-layered short-fiber nonwoven fabric and a support fabric surrounding it, wherein at least one of the nonwoven fabric and the support fabric is polyethylene terephthalate (PET), polypropylene (PP) and poly At least one selected from the group consisting of phenylene sulfide (PPS) and nylon is mixed (mixed spinning), the fuel filter for automobiles, characterized in that the proportion of the nylon is 50 ~ 95wt%. delete delete The fuel filter of claim 1, wherein the non-woven composite layer structure includes two to six web layers that form pores of different sizes. [5] The fuel filter of claim 4, wherein the composite layer structure of the nonwoven fabric is that each web layer is formed of short fibers of different sizes. 5. The fuel filter for an automobile according to claim 4, wherein the composite layer structure of the nonwoven fabric has an interfiber bond between the web layers. 5. The fuel filter for automobiles according to claim 4, wherein the composite layer structure of the nonwoven fabric has a density gradient between fibers between each web layer and even within one web layer. 5. The fuel filter of claim 4, wherein the composite layer structure of the nonwoven fabric includes three webs of bulky, intermediate and dense layers depending on the size of the pores from the outside. A fuel filter for a small engine, which is formed by stacking a support fabric, a short fiber nonwoven fabric and a long fiber nonwoven fabric of a multi-layer structure from the outside, One or more materials selected from the group consisting of polyethylene terephthalate (PET), polypropylene (PP), and polyphenylene sulfide (PPS) are blended with at least one material of the multi-layer nonwoven fabric and the supporting fabric. mixed spinning), the proportion of the nylon fuel filter for a small engine, characterized in that 50 to 95wt%. 10. The fuel filter for a small engine of claim 9, wherein the long fiber nonwoven fabric has a pore size of 10 µm or less. 10. The fuel filter for a small engine according to claim 9, wherein the long fiber nonwoven fabric is a melt brown sheet or a spun bond sheet. Mixed spinning of one or more short fibers and nylon short fibers of polyethylene terephthalate (PET), polypropylene (PP) and polyphenylene sulfide (PPS), the ratio of the nylon to 50 ~ 95wt% for nonwoven fabrics Manufacturing a web; Laminating the web prepared in the above step in a multi-layer and forming a non-woven fabric having a multi-layer structure by needle punching; Wrapping the nonwoven fabric with a support fabric and then heat fusion; Method of manufacturing a fuel filter for a vehicle comprising a. The method of claim 12, wherein the manufacturing of the web comprises inputting the short fibers having different thicknesses to manufacture each web layer to have different pores.

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