JPH08246311A - Nonwoven fabric for filter, its production, framed filter and its production - Google Patents

Abstract

PURPOSE: To obtain a nonwoven fabric for filter having improved sag-preventing function by using short fibers such as polyester fiber and rayon fiber as a main- structure fiber and distributing a shrinking-function fiber entangled to the whole fabric in a mutually connected state. CONSTITUTION: The major part of the composition of this nonwoven fabric 2 for filter is a main-structure fiber 4 and the fabric contains a shrinking- function fiber 5 randomly distributed in the fabric in mutually entangled state. Single or composite short fiber such as polyester fiber and rayon fiber constitutes the main-structure fiber and the short fiber of a heat-shrinkable resin deforming and shrinking by the application of heat constitutes the shrinking-function fiber. The main-structure fiber entangled to the shrinking- function fiber is pulled by the shrinkage of the shrinking-function fiber to cause the shrinkage of the nonwoven fabric for filter and eliminate the sagging of the filter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-woven fabric for a filter, which is attached to an air intake or an exhaust port of a ventilation fan or a ventilation device, and collects oil dust, etc. The present invention relates to a framed filter in which a filter material is stretched over a frame and a method for manufacturing the same.

[0002]

2. Description of the Related Art Nonwoven fabrics of synthetic fibers are widely used as filter materials for filters because they are easy to manufacture, have high productivity, and have high air permeability. For example, Japanese Patent Application Laid-Open No. 58-11339 discloses a framed filter for a ventilation fan in which such a non-woven fabric is integrated and stretched with a resin frame.

A non-woven fabric as a filter material conventionally used for such a filter is a binder in which single or composite short fibers of polyester fiber, rayon fiber and nylon fiber are formed into a sheet shape in which the fiber directions are randomly distributed. Is an ultrathin structure in which constituent fibers are interconnected.
The framed filter as shown in the above-mentioned publication is A
It is manufactured by integrally stretching a non-woven fabric on a resin frame at the time of molding a resin frame of a thermoplastic resin such as a BS resin or a PP resin. Such a framed filter is lightweight, durable and looks good and can be obtained at low cost.
It is often applied as a replaceable, disposable filter.

[0004]

In the above-mentioned non-woven fabric as a conventional filter material, if the plane area is a little large, it can be stretched in a tension state without slack with respect to the frame, which itself exhibits almost elasticity. It's difficult because I don't. In the case where the resin frame is integrated with the resin frame at the time of molding the thermoplastic resin, the resin frame causes a molding shrinkage peculiar to the thermoplastic resin, so that the shrinkage of the resin frame often causes the nonwoven fabric to become more loose. In the conventional framed filter of this type, the non-woven fabric is more or less slack due to these causes.

The slackness or looseness of the non-woven fabric not only impairs the appearance, but is further increased due to the weight of the oil dust collected during use. There is also a problem in contact with the rotating fan.

The present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is to obtain a nonwoven fabric for a filter having a slack removing function for removing slack. The purpose is to improve the removal function, and to establish a method for manufacturing a nonwoven fabric for filters having a slack removal function.

In addition to the above, it is also an object of the present invention to provide a framed filter having good appearance and function with no slack in the nonwoven fabric, and to provide a method for manufacturing a framed filter having good appearance and function. I am about to do it.

[0008]

In order to achieve the above object, the invention of claim 1 is modified by applying heat to a main structural fiber composed of single or composite short fibers such as polyester fiber and rayon fiber. A means is adopted in which shrink-functional fibers having a heat-shrinking property that are shrunk are entangled in the whole and distributed throughout.

In order to achieve the above-mentioned object, the invention of claim 2 is a heat-shrinking property of deforming and shrinking by applying heat to a main structural fiber composed of single or composite short fibers such as polyester fiber and rayon fiber. The shrinking functional fiber having the above is distributed in a state in which it is entwined throughout, and the constituent fiber composed of the main structural fiber and the shrinking functional fiber is connected with a bonding force weaker than the shrinking force of the shrinking functional fiber.

In order to achieve the above object, the invention of claim 3 is such that the main structural fiber in the means according to claim 1 or 2 contains a low melting point resin, and the composition fiber is made of this low melting point resin. A means for connecting by self-fusion by melting is adopted.

In order to achieve the above-mentioned object, the invention of claim 4 is a heat-shrinking property of deforming and shrinking by applying heat to a main raw material fiber consisting of single or composite short fibers such as polyester fiber and rayon fiber. A mixture of fibers having shrinkage-functional fibers mixed with each other is entangled and formed into a breathable three-dimensional porous sheet by connecting the constituent fibers with a binding force weaker than the shrinking force of the shrinkage-functional fibers. Adopt means.

In order to achieve the above object, the invention of claim 5 is modified by applying heat to a low melting point resin fiber as a main raw material fiber consisting of single or composite short fibers such as polyester fiber and rayon fiber. A fiber mixture in which shrinkable functional fibers having shrinkage and heat shrinkage properties are mixed and entangled with each other, and the composition fibers are formed into a breathable three-dimensional porous sheet,
A means for connecting by self-bonding with low melting point resin fibers at a temperature lower than the temperature at which the shrinkable functional fibers shrink is adopted.

In order to achieve the above object, the invention of claim 6 provides a main structural fiber composed of single or composite short fibers such as polyester fiber and rayon fiber in a frame having a round or square frame structure, A means for integrally stretching a breathable non-woven fabric with a frame structure in which shrinkable functional fibers having heat shrinkability that deform and shrink when heat is applied are interconnected and distributed in a state in which they are entwined throughout adopt.

In order to achieve the above object, the invention of claim 7 is a breathable non-woven fabric made of single or composite short fibers such as polyester fibers and rayon fibers in a frame having a round or square frame structure. For the framed filter in which the
A means for partially entangling shrinkable functional fibers having heat shrinkability that deforms and shrinks by applying heat to a part of the nonwoven fabric is adopted.

In order to achieve the above object, the invention of claim 8 relates to a framed filter in which a breathable nonwoven fabric is integrally stretched in a frame of a round or square frame structure, and A means for containing a shrinking function means made of a resin having a heat shrinkability that deforms and shrinks when heat is applied is adopted.

In order to achieve the above object, the invention of claim 9 provides a means for connecting the constituent fibers of the non-woven fabric by self-fusion with a low melting point resin in the means according to any one of claims 6 to 8. adopt.

In order to achieve the above object, the invention of claim 10 has a heat shrinkage property of deforming and shrinking by applying heat to a main raw material fiber made of single or composite short fibers such as polyester fiber and rayon fiber. A non-woven fabric is formed by connecting a fiber mixture in which a shrinkable functional fiber is mixed and entangled into a breathable three-dimensional porous sheet with the composition fibers having a binding force weaker than the shrinking force of the shrinkable functional fiber. , This non-woven fabric is inserted into a molding die for molding a resin frame, the non-woven fabric and the resin frame are joined together to form the resin frame, and then the heat treatment is applied to the non-woven fabric to deform and shrink the shrink functional fibers. To do.

[0018]

In the above-mentioned means according to claim 1, the shrinking functional fiber contained therein is deformed and contracted by applying heat, and the main structural fiber is maintained in a state of being pulled by the contracted functional fiber which is shrunk in the entire region. It is possible to provide a slack removing function.

In the above-mentioned means, the shrink functional fibers contained therein are shrunk while being deformed by applying heat. Since the force of contraction at this time is stronger than the bonding force of combining the constituent fibers, the main structural fibers are quickly pulled by the contracted functional fibers in the entire region, and the tension state is maintained.

In the means according to claim 3, in addition to the operation according to claim 1 or 2,
Since the constituent fibers are connected by self-fusion by melting the low melting point resin, air permeability is improved as compared with bonding by an adhesive.

In the above-mentioned means according to claim 4, a three-dimensional porous material having a breathable property, which has a slack removing function of removing shrinkage by shrinking the shrinking function fiber contained therein by deforming by applying heat. The non-woven fabric for a filter can be manufactured.

In the above-mentioned means according to claim 5, a three-dimensional porous material having a breathability, which has a slack removing function of removing shrinkage by shrinking while shrinking while containing the shrinkable fiber by applying heat. The non-woven fabric for a filter can be manufactured without requiring an adhesive or a bonding facility.

In the above means according to claim 6, by applying heat to the whole nonwoven fabric stretched in the frame structure, the shrinkable functional fibers contained in the nonwoven fabric are deformed and shrink, and the whole is pulled. Since it contracts to the open state, the looseness of the nonwoven fabric with respect to the frame structure is removed.

[0024] In the above-mentioned means, the composition fiber of the non-woven fabric entwined with the shrink functional fiber by applying heat to the shrink functional fiber entangled in a part of the non-woven fabric stretched in the frame structure. Shrinks in a stretched state due to the shrinkage of the shrink-functional fiber, so that the looseness of the nonwoven fabric with respect to the frame structure is removed.

In the above means according to claim 8, by applying heat to the non-woven fabric stretched in the frame structure, the shrinking function means contained in the non-woven fabric is deformed and contracted, and the whole is pulled. Therefore, the slack of the non-woven fabric with respect to the frame structure is removed.

In the means according to claim 9, in addition to the effect according to any one of claims 6 to 8, the composition fibers of the non-woven fabric are connected by self-bonding with the low melting point resin. The breathability is improved as compared with the bonding by.

In the above-mentioned means according to claim 10,
When the resin frame is molded, the non-woven fabric becomes loose due to the molding shrinkage of the resin frame, but since heat is applied to the non-woven fabric bonded and integrated with the resin frame, the shrinkable functional fibers contained in the non-woven fabric shrink while deforming due to heat. Since the constituent fibers are pulled, it is possible to manufacture a framed filter in which a nonwoven fabric is stretched in a tension state with respect to a resin frame.

[0028]

An embodiment of the present invention will be described below with reference to the drawings. Example 1. FIG. 1 is a plan view showing a framed filter as an embodiment of the present invention. The framed filter 1 is removably mounted on the suction side front surface of a ventilation fan or the like and has a function of collecting oil dust contained in the suctioned air.

The filter material of the framed filter 1 of the first embodiment is
The filter non-woven fabric 2 is made of synthetic fibers in the form of a three-dimensional porous thin sheet. The filter non-woven fabric 2 is a relatively thin resin frame 3 formed in a round shape or a square shape.
Is stretched integrally with the resin frame 3 inside the frame.

The filter non-woven fabric 2 as the filter material is shown in FIG.
As shown in (1), it is composed of main structural fibers 4 that make up most of the composition and shrinkage functional fibers 5 that make up part of the composition. The main structural fibers 4 are synthetic fibers such as polyester fibers, rayon fibers, and nylon fibers that have been widely used as materials for this type of non-woven fabric, and single type or composite resin short fibers having different thicknesses are used. Has been. The shrinkable functional fiber 5 is a short fiber of a resin having a heat shrinkability that is deformed and shrunk when heat is applied. FIG. 3 shows a cross section of the shrink functional fiber 5 used in this Example 1. One half of the fiber cross section is made of a polyester resin 6 that is thermally deformed and heat shrunk at about 250 ° C., and the other half is For example, it has a bimetal structure composed of a modified polyester resin 7 or a polyethylene resin which is thermally deformed and shrunk at about 150 ° C.

Most of the composition of the filter non-woven fabric 2 is the main structural fiber 4, and the shrinkable functional fiber 5 is randomly distributed throughout the main structural fiber 4. Microscopically, the shrinkable functional fiber 5 is present as a part of the composition fiber in the filter non-woven fabric 2 in a greatly curled form as shown in FIG. As shown in (b) of 4, contraction behavior occurs in the composition, and the composition is fixed in the contracted state. With contraction of the contraction function fiber 5,
The main structural fibers 4 intertwined with this are also pulled, and as a result, the non-woven fabric for filter 2 shrinks smaller than the original plane area. That is, the filter nonwoven fabric 2 has a slack removing function for removing slack.

As shown in FIG. 5, the filter non-woven fabric 2 is cut into a predetermined size, inserted into a molding die 8 for injection molding the resin frame 3, and the resin frame 3 is injection-molded. When the non-woven fabric for filter 2 is integrated with the resin frame 3 and is stretched in the frame, the filter with frame 1 as shown in FIG. 1 is obtained. The material of the resin frame 3 is a thermoplastic resin such as ABS resin or PP resin, and since the resin frame 3 causes the molding shrinkage peculiar to the thermoplastic resin, the shrinkage of the resin frame 3 loosens the tension of the filter nonwoven fabric 2. When the molding of the resin frame 3 is completed, the filter nonwoven fabric 2 is loosened as shown in FIG.

Not only does the framed filter 1 in this state look unattractive, but if it is used as it is, the problems described in the section of the problem to be solved arise. The framed filter 1 of Example 1 is not in a completed state in this state, but is completed by subsequently applying heat to the filter nonwoven fabric 2 to perform heat treatment. That is, when the filter nonwoven fabric 2 is heat-treated by blowing hot air of about 150 ° C. to 160 ° C. for several minutes, the slack removing function of the filter nonwoven fabric 2 can be exhibited. By the heat treatment, the non-woven fabric 2 for the filter shrinks due to the shrinkage of the functional fibers 5.
As shown in FIG. 4, the resin frame 3 is in a tensioned state, and the finished framed filter 1 is obtained. This framed filter 1 has a good appearance, and the slack of the filter non-woven fabric 2 which causes troubles does not occur even if oil dust is attached.

Even in the case of constructing a filter with a frame in which the filter non-woven fabric 2 is stretched over a frame that hardly causes shrinkage, it is quite difficult to tension and fix an ordinary non-woven fabric, but this non-woven fabric for filter is difficult. If you use 2,
After being cut into a predetermined area and fixed to the frame body by tensioning, the heat treatment as described above makes it possible to bring the filter nonwoven fabric 2 into a tension state with respect to the frame body by the slack removing function of the filter nonwoven fabric 2.

The nonwoven fabric 2 for filters having the slack removing function can be manufactured by using ordinary nonwoven fabric manufacturing techniques and manufacturing equipment. That is, the shrinkable functional fibers 5 were mixed with the main raw material fibers 9 (4) consisting of single or composite short fibers having different thicknesses such as polyester fibers and rayon fibers, and the fibers were randomly entangled and entangled. After the fiber mixture was obtained, as shown in FIG. 8, this was continuously molded into a breathable three-dimensional porous thin sheet on a line to obtain a primary molded product 1
Get 0. With the primary molded product 10 placed on the line, an adhesive 12 such as an acrylic copolymer or vinylidene chloride copolymer emulsion is used as a binder on one side (sometimes on both sides) by a spray device 13 to spray dryer 14.
You can wind it up while passing through.

The adhesive 12 is for connecting the constituent fibers together, and may be connected by self-bonding with the low melting point resin 15 in addition to the adhesive 12. In the case of self-bonding, the fibers of the low melting point resin 15 are mixed into the main raw material fibers 9 and the shrinkable functional fibers 5, or the low melting point resin 15 coated on the surface is used as the main raw material fibers 9. Low melting point resin 1
The melting point of 5 must be set lower than the temperature at which the shrinkable functional fiber 5 deforms and shrinks. In the case of this example, 130 ° C.
It is possible to use a low melting point resin 15 that can be bonded to some extent. If the melting point of the low-melting point resin 15 is too close to or higher than the temperature at which the shrinkable functional fiber 5 is deformed and shrunk, the shrinkable functional fiber 5 reacts in the process of self-bonding and the loosening removing function is lost. .

Since the composition fibers are connected with the adhesive agent 12 as shown in FIG. 9, since the adhesive agent 12 connects the fibers with each other in a form in which water droplets are attached to the cobweb, it is relatively rigid. The nonwoven fabric 2 for a filter is easy to handle as a thin filter material, but since the adhesive 12 is used, the manufacturing tends to be complicated and the productivity is slightly low. What is connected by self-fusion,
Since the composition fibers are connected in dots as shown in FIG. 10,
The nonwoven fabric 2 for filters is relatively soft and has good air permeability, and since it only requires equipment for heat bonding, it is easy to manufacture and has good productivity.

Although the means for bonding the composition fibers may be adhesion or self-bonding, unless the binding force of the composition fibers is set to be weaker than the contracting force of the contraction functioning fibers 5, the slack removing function becomes low. That is, depending on the amount of the adhesive 12 or the strength of the adhesive force, or the amount of the low melting point resin 15 or the strength of the bonding force, the contracting force of the shrinkable functional fiber 5 is adjusted so as to exceed the bonding force. In this case, since the self-fusing ones are connected in a dot shape as shown in FIG. 10, the composition fibers are easier to move than the ones using the adhesive 12, and it is easy to adjust the contracting force and the binding force, and the slack The removal function is also improved.

Embodiment 2 FIG. In this second embodiment, the conventional non-woven fabric 16 is made so as to give the slack removing function described in the first embodiment. That is, as shown in FIGS. 11 and 12, a non-woven fabric 16 formed of a single type or a composite type of resin short fibers of synthetic fibers such as polyester fiber, rayon fiber and nylon fiber is cut into a required area, and A non-woven fabric for a filter is formed by partially entangling the shrinkage-functional fiber 5 having the heat-shrinkability, which is deformed and shrunk by applying heat to the outer peripheral portion or the central portion, by means such as needle punching. 2 is configured.

This filter non-woven fabric 2 is also integrated with the resin frame 3 as shown in Example 1, and the framed filter 1 is obtained.
Can be The shrinkable functional fiber 5 entangled in the non-woven fabric 16 is heated in that portion to give the first embodiment.
As described above, the composite fibers of the nonwoven fabric 16 that contract and be entangled can be drawn in to tension the whole. The position where the contraction function fiber 5 is entangled is a trampoline-like shape in the peripheral part and is pulled outward, but in the center part, the contraction function fiber 5 is drawn inward, and the latter is effective in contracting force of the contraction function fiber 5. Can be operated. Since the other basic functions are the same as those of the first embodiment, the description thereof will be omitted.

Example 3. In this third embodiment, as shown in FIG. 13, the shrink functional fiber 5 of the filter nonwoven fabric 2 shown in the first embodiment is replaced with a shrink functional means 17 having a heat shrink property of being deformed and shrunk by applying heat. The non-woven fabric 2 for filters constitutes the framed filter 1. The contraction function means 17 is configured as a cord-shaped material or a thread material composed of the contraction function fibers 5 shown in the first embodiment, or a resin thin wire having a similar contraction function. By constructing the nonwoven fabric 2 for filters by entwining these shrinkage function means 17 in the composition fibers of the nonwoven fabric randomly or regularly, and stretching the nonwoven fabric for filter 2 in the frame structure such as the resin frame 3 as shown in Example 1. The framed filter 1 having a slack removal function is provided, and the slack of the filter nonwoven fabric 2 can be removed by heat treatment. Since the other basic functions are the same as those shown in the first embodiment, the description thereof will be omitted.

[0042]

As is apparent from the above description of the embodiments, according to the invention of claim 1, a nonwoven fabric for filters having a slack removing function capable of removing slack by simply applying heat can be obtained.

According to the second aspect of the invention, since the force of shrinkage of the shrinkable functional fiber due to heat is stronger than the force of binding the constituent fibers, the slack removing function is improved.

According to the invention of claim 3, in addition to the effect according to the invention of claim 1 or claim 2, since the composition fibers are connected by self-fusion by melting of the low melting point resin, an adhesive is used. It improves breathability and stabilizes the slack eliminating function.

According to the fourth aspect of the present invention, a breathable three-dimensional porous material having a slack removing function of removing the slack by shrinking while shrinking while containing the shrinkable functional fiber by applying heat. The filter nonwoven fabric can be easily manufactured.

According to the fifth aspect of the present invention, a breathable three-dimensional porous material having a slack removing function of removing the slack by shrinking while shrinking while containing the shrink functional fibers by applying heat. The nonwoven fabric for filters can be manufactured with high productivity without the need for an adhesive or an adhesive facility.

According to the invention of claim 6, by applying heat to the whole of the nonwoven fabric stretched in the frame structure, the shrinkable functional fibers contained in the nonwoven fabric are deformed and shrink, and the whole is pulled. Since it contracts to a state, a framed filter having a good appearance and function of the nonwoven fabric without sagging relative to the frame structure can be obtained.

According to the invention of claim 7, the composition fibers of the non-woven fabric entwined with the shrink functional fibers are heated by applying heat to the shrink functional fibers entangled in a part of the non-woven fabric stretched in the frame structure. Shrinkage Functional fiber shrinks into a stretched state, so that a filter with a frame can be obtained in which the nonwoven fabric has no slack in the frame structure and has a good appearance and function.

According to the invention of claim 8, by applying heat to the non-woven fabric stretched in the frame structure, the shrinking function means contained in the non-woven fabric is deformed and contracted, so that the whole is pulled. Since it contracts, slack of the nonwoven fabric with respect to the frame structure is removed, and a filter with a frame having a good function without slack of the nonwoven fabric with respect to the frame structure is obtained.

According to the invention of claim 9, in addition to the effect according to any one of claims 6 to 8, the composition fibers of the non-woven fabric are connected by self-bonding with a low melting point resin, so that the bonding The breathability is improved and the slack eliminating function is stabilized as compared with the case of binding by the agent.

According to the tenth aspect of the present invention, when the resin frame is molded, the nonwoven fabric is in a loosened state due to the molding shrinkage of the resin frame. However, since heat is applied to the nonwoven fabric bonded and integrated with the resin frame, it is included in the nonwoven fabric. Since the shrinkable functional fiber shrinks while being deformed by heat and the composite fiber is pulled, it is possible to manufacture a framed filter in which a nonwoven fabric is stretched in a tension state with respect to a resin frame and which has an excellent appearance and function.

[Brief description of drawings]

FIG. 1 is a plan view of a framed filter according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an enlarged fiber composition of the nonwoven fabric for filters of Example 1.

FIG. 3 is an explanatory view showing an enlarged cross-sectional shape of the shrink-functional fiber of Example 1.

FIG. 4 is an explanatory diagram showing the behavior of heat shrinkage of the shrink-functional fiber of Example 1.

FIG. 5 is an explanatory diagram showing a manufacturing process of the framed filter of the first embodiment.

FIG. 6 is a cross-sectional view showing a state before heat treatment of the framed filter of Example 1.

FIG. 7 is a cross-sectional view showing a state of the framed filter of Example 1 after heat treatment.

FIG. 8 is an explanatory diagram showing a manufacturing process of the filter nonwoven fabric of Example 1.

FIG. 9 is an explanatory view showing an enlarged fiber structure of the filter nonwoven fabric of Example 1 which is connected by an adhesive.

FIG. 10 is an explanatory view showing an enlarged fiber structure of the non-woven fabric for a filter of Example 1 which is self-fused with a low melting point resin.

FIG. 11 is a front view showing the configuration of the framed filter of the second embodiment.

FIG. 12 is a front view showing the configuration of another framed filter according to the second embodiment.

FIG. 13 is a front view showing the structure of a framed filter according to a third embodiment.

[Explanation of symbols]

 1 Filter with Frame 2 Nonwoven Fabric for Filter 3 Resin Frame 4 Main Structural Fiber 5 Shrinkage Functional Fiber 8 Mold 9 Main Raw Material Fiber 12 Adhesive 15 Low Melting Point Resin 16 Nonwoven Fabric 17 Shrinkage Function Means

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location F24F 7/013 101 F24F 7/013 101G

Claims (10)

[Claims] 1. A state in which shrink-functional fibers having heat-shrinkability that are deformed and shrunk when heat is applied are entwined throughout the main structural fibers composed of single or composite short fibers such as polyester fibers and rayon fibers. Non-woven fabric for filters having a structure in which they are connected to each other and distributed. 2. A state in which shrink-functional fibers having a heat-shrinkable property of being deformed and shrunk when heat is applied are entwined throughout the main structural fibers composed of single or composite short fibers such as polyester fibers and rayon fibers. A non-woven fabric for filters, characterized in that the composition fibers composed of the main structural fibers and the shrink functional fibers are connected to each other with a bonding force weaker than the shrink force of the shrink functional fibers. 3. The non-woven fabric for a filter according to claim 1, wherein the low melting point resin is contained, and the constituent fibers are connected by self-fusion with the low melting point resin. Non-woven fabric for filters. 4. A shrinkable functional fiber having heat shrinkability that is deformed and shrunk when heat is applied to a main raw material fiber composed of single or composite short fibers such as polyester fiber and rayon fiber, and is entangled therein. A filter characterized in that after a fiber mixture is obtained, the composition fiber is formed into a breathable three-dimensional porous sheet by connecting the constituent fibers with a binding force weaker than the shrinking force of the shrink-functional fibers. For manufacturing nonwoven fabrics for textiles. 5. A low-melting resin fiber is added to a main raw material fiber made of single or composite short fibers such as polyester fiber and rayon fiber, and a shrinkable functional fiber having heat shrinkability that is deformed and shrunk when heat is applied. After the fiber mixture is mixed and entangled with each other, the composition fiber is formed into a breathable three-dimensional porous sheet at a temperature lower than the shrinking temperature of the shrinkable functional fiber and the low melting point. A method for producing a non-woven fabric for a filter, which is characterized in that the non-woven fabric for a filter is formed by connecting the resin fibers by self-fusion. 6. A heat-shrinkable property in which a main structural fiber made of single or composite short fibers such as polyester fiber or rayon fiber is deformed and shrunk by applying heat in a frame having a round or square frame structure. A filter with a frame having a structure in which breathable nonwoven fabrics in which shrinkable functional fibers having the above are entwined throughout and connected to each other and distributed are integrally stretched. 7. A filter with a frame in which a breathable non-woven fabric made of single or composite short fibers such as polyester fibers and rayon fibers is integrally stretched in a frame having a round or square frame structure. A filter with a frame, characterized in that a shrinkable functional fiber having a heat shrinkage property of being deformed and contracted by applying heat to a part of the non-woven fabric is partially entangled. 8. A filter with a frame in which a breathable non-woven fabric is integrally stretched in a frame having a round or square frame structure, and the non-woven fabric is deformed and shrunk when heat is applied. A filter with a frame, comprising a shrinkage function means made of a resin having properties. 9. The framed filter according to claim 6, wherein the composition fibers of the non-woven fabric are connected by self-fusion with a low melting point resin. filter. 10. A fiber obtained by mixing entangled shrink-functional fibers having heat-shrinkability, which are deformed and shrunk by applying heat to main raw fibers composed of single or composite short fibers such as polyester fibers and rayon fibers. A mold for forming a non-woven fabric by connecting the composition fibers into a breathable three-dimensional porous sheet with the composition fibers having a weaker binding force than the shrinking force of the shrink-functional fibers, and molding the non-woven fabric into a resin frame. A method for manufacturing a filter with a frame, comprising: inserting into a resin frame, bonding the non-woven fabric and the resin frame together to form an integral body, and then applying heat to the non-woven fabric to deform and shrink the shrink functional fibers.