filter film

Abstract

The present invention provides a filter film that ensures sufficient airflow, effectively removes oil and dust, suppresses clogging, extends the time between replacements and reduces the frequency of replacement, is less likely to leave residue or marks after removal, improves adhesive strength while reducing the amount of adhesive layer, and has a simple structure that can be easily manufactured. [Solution] The filter film 10 has a filter layer 11 made of nonwoven fabric and a strip-shaped hot melt spray adhesive fiber layer 12 on one side 11c of the filter layer 11, thereby having a gap region 13 in which the filter layer 11 is exposed, and the hot melt spray adhesive fibers 12a of the hot melt spray adhesive fiber layer 12 are entangled and attached to the outermost nonwoven fabric fibers 11b on one side 11c of the filter layer 11.

Description

[Technical Field]

[0001] The present invention relates to a removable filter film used by being attached to the intake side or exhaust port of ventilation fans and various other fans, and having a strip-shaped hot-melt spray adhesive fiber layer on one side of a filter layer made of nonwoven fabric. [Background technology]

[0002] A removable membrane filter can be attached to air inlets and outlets, such as the intake side of range hoods and exhaust fans in kitchens and commercial kitchens, the intake side and exhaust vents of ventilation equipment in workplaces and factories, and the outlets of air conditioning equipment.

[0003] Traditionally, such filters have been used by being attached to a thin aluminum frame shaped to fit the air inlet and outlet, and made removable with adhesive double-sided tape, or by being attached directly to the air inlet and outlet.

[0004] As oil and dust accumulate with use, the filter gradually becomes dirty and its breathability decreases. This type of membrane filter, or the entire thin frame it's attached to, is removed and replaced with a new filter membrane or frame. Thanks to these filter membranes, the cleaning of ventilation fans, ventilation systems, and air conditioning equipment is significantly reduced, while maintaining a hygienic environment and extending their lifespan.

[0005] Patent Document 1 discloses a filter for filtering gas that passes through an object, comprising only a rectangular sheet of nonwoven fabric, an adhesive applied to the entire surface of one side of the nonwoven fabric in a diagonal stripe pattern relative to the upper edge of the nonwoven fabric, and a character-shaped adhesive having a display function such as characters or symbols applied to the portion of the nonwoven fabric on the one side where the adhesive is not applied. Such filters, while impermeable to air in the areas coated with adhesive, remove oil and dust in the non-woven fabric areas without adhesive, thus allowing for relatively infrequent replacement. However, during replacement, some of the adhesive coating remains on the surface, resulting in what is known as residue or residue. This residue or residue makes it difficult to attach the replacement filter or the thin frame to which it is attached, and also makes it look unsightly. Therefore, it is necessary to apply a remover beforehand to dissolve the residue or heat it with a hairdryer to reduce its adhesive strength and wipe it off, which is troublesome.

[0006] Furthermore, Patent Document 2 discloses an adhesive filter comprising a nonwoven fabric layer and an adhesive layer in which an adhesive is spray-coated onto one side surface of the nonwoven fabric layer, wherein the adhesive layer is mainly composed of a hot-melt spray adhesive that becomes hot-melt upon melting and consists of intertwined fibers, and the diameter of the fibers in the adhesive layer is 80 μm or more and 300 μm or less. As described in the examples of this adhesive filter, the entire surface of the filter can be used as an effective area in the range in which air can pass through. Such filters, with their hot-melt spray adhesive fibers, adhere to the surface with minimal contact area, making them less likely to leave residue or marks when replaced. However, because the hot-melt spray adhesive layer covers the entire surface, the amount of air that can pass through per unit time is inevitably reduced, resulting in decreased ventilation. Furthermore, the hot-melt spray adhesive makes it easy for oil and dust to adhere to the fibers, causing clogging and requiring frequent replacement, which is inconvenient.

[0007] The inventors diligently researched and developed a filter that utilizes the advantages of both filters, such as those described in Patent Document 1 and those described in Patent Document 2, while largely minimizing their disadvantages. As a result, they discovered a filter film that exhibits effects not found in either of the other filters, thus completing the present invention. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Patent No. 4082648 [Patent Document 2] Patent No. 6322745 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] The present invention was made to solve the aforementioned problems, and aims to provide a filter film that can ensure a sufficient amount of air passage, remove oil and dust sufficiently, suppress clogging, extend the period before replacement and reduce the frequency of replacement, is less likely to leave residue or marks after removal, improves adhesive strength while reducing the amount of adhesive layer, has a simple structure and can be manufactured simply, and a method for manufacturing the same. [Means for solving the problem]

[0010] The filter film of the present invention, made to achieve the above objective, Weight: 25-150g / m 2 of A filter layer made of nonwoven fabric, and on one side of the filter layer Basis weight 8~15g / m 2 with fibrous grain A filter film having a gap region in which the filter layer is exposed, wherein the hot melt spray adhesive fiber layer is on the outermost nonwoven fabric fibers on one side of the filter layer. Among them are fibers with a diameter of 50-200 μm that are thicker than the fiber diameter of the nonwoven fabric. It is characterized by the fact that hot melt spray adhesive fibers are intertwined and attached.

[0011] This filter film may be such that multiple hot-melt spray adhesive fiber layers have the gap regions between adjacent strips.

[0012] This filter membrane has air permeability due to the gaps between the fibers of the non-woven fabric in the gap region, and the region of the hot-melt spray adhesive fiber layer has air permeability due to the gaps between the hot-melt spray adhesive fibers and the gaps between the fibers of the non-woven fabric to which it is attached.

[0013] This filter membrane has adhesiveness to the adherend because the hot-melt spray adhesive fiber layer is made of hot-melt spray adhesive fibers made of, for example, rubber-based hot-melt spray adhesive, acrylic-based hot-melt spray adhesive, or urethane-based adhesive.

[0014] This filter membrane, for example, has hot-melt spray adhesive fibers having a fiber diameter of 5 μm to 900 μm in minimum diameter.

[0015] This filter membrane, for example, has a basis weight of 5 to 30 g / m for the hot-melt spray adhesive fiber layer. 2 and is such.

[0016] This filter membrane may be such that the hot-melt spray adhesive fiber layer is vertical, horizontal, and / or diagonal on the filter layer.

[0017] This filter membrane may be such that the hot-melt spray adhesive fiber layer is in a continuous or intermittent strip shape.

[0018] This filter membrane may be such that the hot-melt spray adhesive fiber layer is in an intermittent lattice-shaped strip.

[0019] This filter membrane preferably has the hot-melt spray adhesive fiber layer in a strip shape with a width of 3 to 20 mm.

[0020] This filter membrane may be such that the hot-melt spray adhesive fiber layer forms a strip by setting the gap region to a width of 3 to 40 mm.

[0021] In this filter film, it is preferable that the area of ​​the hot-melt spray adhesive fiber layer is 25 to 60% of the area of ​​the filter layer.

[0022] This filter film may have a release layer attached to the hot melt spray adhesive fiber layer.

[0023] To achieve the above objective, the present invention provides a method for manufacturing a filter film, which involves thermally melting a hot-melt spray adhesive, Weight: 25-150g / m 2 of A fibrous spray is applied from a nozzle to one side of a filter layer made of nonwoven fabric. Basis weight 8~15g / m 2 with fibrous grain The process involves applying a strip-shaped hot-melt spray adhesive fiber layer to the nonwoven fabric fibers on one side of the filter layer. Among them are fibers with a diameter of 50-200 μm that are thicker than the fiber diameter of the nonwoven fabric. This method involves manufacturing a filter film using hot melt spray, in which hot melt spray adhesive fibers are entangled and adhere to the filter, while gap regions are created that expose the filter layer.

[0024] This filter film manufacturing method is characterized by forming the strip-shaped hot melt spray adhesive fiber layer by blowing air from an air nozzle toward the tip of the nozzle so that the hot melt spray adhesive being sprayed does not spread in the spraying direction. [Effects of the Invention]

[0025] The filter film of the present invention has gap regions in which the filter layer without the hot-melt spray adhesive fiber layer is exposed, thereby ensuring a sufficient amount of air passage.

[0026] Furthermore, because this filter film does not have a hot-melt spray adhesive fiber layer in the gap areas, it can fully exhibit its inherent ability to remove oil and dust. As a result, clogging can be suppressed for a long period of time, and consequently, the time between replacements can be extended, reducing the frequency of replacements.

[0027] Furthermore, this filter film is less likely to leave residue or marks when removed because the hot-melt spray adhesive fiber layer is thin and strip-shaped, resulting in a small contact area with the object it is attached to, and the fibers of the hot-melt spray adhesive fiber layer are intertwined with the nonwoven fabric fibers of the filter layer.

[0028] Furthermore, this filter film has adhesive strength equivalent to that of a filter where the adhesive is applied in layers without gaps, even though the hot-melt spray adhesive fiber layer is thin and strip-shaped, resulting in a small contact area with the substrate. Therefore, even if the amount of hot-melt spray adhesive fiber layer per unit area is reduced, the adhesive strength can be improved, reducing manufacturing costs while achieving effects equal to or better than conventional methods.

[0029] According to the filter film manufacturing method of the present invention, due to its simple configuration, filter films can be manufactured simply, efficiently, and inexpensively in a stable manner. This reduces raw material costs and simplifies the manufacturing process, thereby contributing to the Sustainable Development Goals (SDGs). [Brief explanation of the drawing]

[0030] [Figure 1] This is a partial plan view showing an overview of the filter film to which the present invention is applied. [Figure 2] This is a schematic, enlarged cross-sectional view of a filter film to which the present invention is applied, taken along the line A-A'. [Figure 3] This is a partial plan view showing another embodiment of a filter film to which the present invention is applied. [Figure 4] This is a partial perspective view showing another embodiment of a filter film to which the present invention is applied. [Figure 5]This is a schematic diagram showing an overview of the filter film manufacturing method to which the present invention is applied. [Modes for carrying out the invention]

[0031] The following describes in detail embodiments for carrying out the present invention, but the scope of the present invention is not limited to these embodiments.

[0032] The filter film of the present invention will be described with reference to Figure 1, a partially cutaway front view.

[0033] The filter film 10 has a strip-shaped hot-melt spray adhesive fiber layer 12 attached to one side of a filter layer 11 made of nonwoven fabric. In the areas where the strip-shaped hot-melt spray adhesive fiber layer 12 is not attached, the filter layer 11 itself is exposed, forming a gap region 13. Therefore, on one side of the filter 11, both the gap region 13 where the filter layer 11 is exposed and the hot-melt spray adhesive fiber layer 12 are exposed.

[0034] Figure 2 is a schematic enlarged cross-sectional view of the filter film 10 in Figure 1, taken along the line A-A'. As shown in the figure, the filter layer 11 is made of nonwoven fabric by intertwining nonwoven fibers 11a. The hot melt spray adhesive fibers 12a of the hot melt spray adhesive fiber layer 12 are intertwined and attached to the outermost nonwoven fabric fibers 11b on one side 11c of the filter layer 11.

[0035] The filter layer 11, being a nonwoven fabric, has moderate breathability inherent to nonwoven fabrics and moderate filtration properties that can adsorb oil and dust due to the voids between the fibers of the nonwoven fabric in the void region 13. The hot melt spray adhesive fiber layer 12 also has a certain degree of moderate breathability, though not as much as nonwoven fabric, due to the voids between the hot melt spray adhesive fibers 12a, and superior filtration properties that allow it to adsorb more oil and dust than nonwoven fabric.

[0036] FIG. 1 shows an example in which a plurality of strip-shaped hot-melt spray adhesive fiber layers 12 with a width W1 are attached in the longitudinal direction of the paper surface. The hot-melt spray adhesive fiber layer 12 is, for example, in a strip shape with a width W1 of 3 to 20 mm, preferably 3 to 15 mm, more preferably 5 to 15 mm, and even more preferably 5 to 10 mm.

[0037] When the width W1 of such a strip-shaped hot-melt spray adhesive fiber layer 12 or the width W2 of the gap region 13 between the hot-melt spray adhesive fiber layers 12 is within the above range, in a 180° peel strength test conducted in accordance with JIS Z 0237:2022 (Adhesive Tape and Adhesive Sheet Test Methods), the peel strength in the longitudinal direction (the direction in which the strip extends) can be 800 g / 10 cm or more, and the peel strength in the transverse direction (the direction perpendicular to the direction in which the strip extends) can be 1450 g / 10 cm or more.

[0038] On the other hand, the gap region 13 between adjacent strip-shaped hot-melt spray adhesive fiber layers 12 has a width W2 of 3 to 40 mm, preferably 3 to 30 mm, more preferably 3 to 15 mm, and even more preferably 5 to 10 mm.

[0039] The area A of the filter layer 11 11 with respect to the area A of the hot-melt spray adhesive fiber layer 12 12 of the area ratio A 12 / A 11 is 25 to 50%, preferably 25 to 40%.

[0040] In the hot-melt spray adhesive fiber layer 12, the hot-melt spray adhesive fibers 12a have a fiber diameter with a minimum diameter of 5 μm, preferably 80 μm, a maximum diameter of 900 μm, preferably 600 μm, and more preferably 200 μm. One hot-melt spray adhesive fiber 12a is 5 to 300 μm, preferably 80 to 300 μm, but in the hot-melt spray adhesive fiber layer 12, since the hot-melt spray adhesive fibers 12a are formed by spraying, they can overlap each other by two or three, and the portion where three overlap has a maximum thickness of three times the diameter (see the enlarged view in FIG. 2).

[0041] The hot melt spray adhesive fiber layer 12 has a basis weight, i.e., the amount of hot melt spray adhesive fibers 12a adhering to it, which is 5 to 30 g / m². 2 Preferably 5-15 g / m 2 More preferably 8-15 g / m 2 The amount of adhesive fiber layer 12 attached to the hot melt spray is 5 g / m². 2 If the amount of adhesive applied to the adhesive layer is less than 15 g / m², the tackiness for adhering and maintaining the filter film 10 to the object to be adhered 40 may decrease. 2 If the thickness exceeds this, it will result in forming a hot melt spray adhesive fiber layer 12 that is thicker than necessary, leading to increased costs.

[0042] This spacing region 13 has a width W2 and an area ratio A 12 / A 11 If the fiber diameter and / or amount of adhesion are within the aforementioned range, the air permeability will only be slightly lower than that of the nonwoven fabric alone due to the presence of the hot melt spray adhesive fiber layer 12, but it will still be possible to secure a sufficient amount of air permeability that is almost equivalent to that of the nonwoven fabric alone. Furthermore, it exhibits sufficient peel strength. Moreover, even if it is peeled off when replacing the filter film 10, it will not leave any residue or marks of the hot melt spray adhesive fiber layer 12.

[0043] The mechanism by which the hot melt spray adhesive fiber layer 12 can achieve the seemingly contradictory effects of ensuring sufficient airflow while possessing sufficient peel strength despite being in a strip shape, and simultaneously having peelability that leaves no residue or marks, is not entirely clear, but it is presumed to be as follows.

[0044] As shown in Figure 2, the hot melt spray adhesive is first melted and sprayed to become fibrous heat-melt spun fibers. Immediately afterward, it is blown away by hot air, stretched and made into ultrafine fibers, and then, due to heat dissipation by the hot air, adheres to and entangles with the outermost nonwoven fabric fibers 11b on one side 11c of the filter layer 11. This causes the fibers to adhere to and entangle with the nonwoven fabric fibers 11b in a strip-like manner, forming solidified fibers. More heat-melt spun fibers are then blown onto these solidified fibers, adhering and entangling in multiple layers to form new solidified fibers, until finally a web-like hot melt spray adhesive fiber 12a is formed, creating a strip-shaped hot melt spray adhesive fiber layer 12.

[0045] Generally, spray atomization can be done using methods such as melt spraying, but we will use the hot melt spraying method. In the hot melt spraying method, the fiber diameter can be freely selected by combining the nozzle diameter, air pressure, hot air temperature, and the "melting temperature" of the hot melt material.

[0046] In this case, the hot melt spray adhesive fibers 12a of the strip-shaped hot melt spray adhesive fiber layer 12 are inherently adhesive due to the adhesiveness of the hot melt spray adhesive used as a raw material. Therefore, the strip-shaped hot melt spray adhesive fiber layer 12 is also adhesive. The adhesiveness is strong because the hot melt spray adhesive fibers 12a of the hot melt spray adhesive fiber layer 12 and the outermost nonwoven fabric fibers 11b of the filter layer 11, which is made of nonwoven fabric, are intertwined. On the other hand, the strip-shaped hot melt spray adhesive fiber layer 12 is made of hot melt spray adhesive fibers 12a that are repeatedly blown away and adhered in layers until they eventually form a web, so the adhesive strength per unit area of ​​the hot melt spray adhesive fiber layer 12 is very strong.

[0047] In the gap regions 13 on the filter layer 11 where the hot melt spray adhesive fiber layer 12 is not attached, the inherent breathability of the nonwoven fabric of the filter layer 11 is maintained. On the other hand, although there is some loss of breathability in the hot melt spray adhesive fiber layer 12 because the hot melt spray adhesive fibers 12a are in a web-like structure, considerable permeability is maintained, so the filter film 10 as a whole is able to maintain almost the inherent breathability of the nonwoven fabric of the filter layer 11.

[0048] The hot melt spray adhesive fiber layer 12 is in the shape of a strip with a width of 3 to 20 mm, and the hot melt spray adhesive fibers are thick, ranging from 80 to 900 μm, which is thicker than the fiber diameter of the nonwoven fabric filter layer 13. Furthermore, because they are hot melt spray adhesive fibers, they have a fibrous grain and are oriented in almost the same direction. As a result, they do not tear or delaminate when peeled, and are therefore presumably relatively difficult to peel off. On the other hand, if the hot melt spray adhesive fibers are thinner than this range, they will tear or delaminate when peeled.

[0049] Furthermore, when peeling the filter film 10 in direction B, the adhesive strength between the hot melt spray adhesive fibers 12a of the hot melt spray adhesive fiber layer 12 and the outermost nonwoven fabric fibers 11b on one side 11c of the filter layer 11 is stronger than the adhesive strength between the object to be adhered 40 and the hot melt spray adhesive fiber layer 12, so it is presumed that no residue or peeling marks will be left behind.

[0050] To form such a hot melt spray adhesive fiber layer 12, the hot melt spray adhesive that forms the hot melt spray adhesive fibers 12a is preferably a rubber-based hot melt spray adhesive, an acrylic-based hot melt spray adhesive, an ethylene vinyl acetate-based adhesive, an olefin-based adhesive such as polyethylene or polypropylene, a polyamide-based adhesive, a polyester-based adhesive, or a polyurethane-based adhesive. Among these, the rubber-based hot melt spray adhesive is even more preferable because it exhibits sufficient adhesion to both the nonwoven fabric fibers 11a of the nonwoven fabric layer 11 and the material of the object to be adhered to, regardless of the material. The hot melt spray adhesive is a type of adhesive that contains substantially no organic solvents, is solid or semi-solid at room temperature, and exhibits adhesiveness by heating and melting, then applying or spraying.

[0051] Hot melt adhesives are used not in conventional coating printing methods such as gravure printing, but by heating and melting a hot melt spray adhesive and spraying it to form a layer of intertwined fibers, known as hot melt spray adhesive fibers. Therefore, the hot melt spray adhesive fiber layer 12 having hot melt spray adhesive fibers 12a formed from hot melt spray adhesive fibers does not have its air permeability as a filter impaired, and its filter function is not reduced.

[0052] The nonwoven fabric forming the filter layer 11 may be made of polyolefin resins such as polyethylene (PE) resin and polypropylene (PP) resin; polyester resins such as polyethylene terephthalate (PET); polyamide (PA) resins such as nylon; natural fibers such as cotton, hemp, and cellulose fibers; regenerated fibers such as rayon; aramid fibers; or glass fibers. Among these, polyolefin resins such as polyethylene (PE) resin and polypropylene (PP) resin are preferred. The basis weight of the nonwoven fabric is 25 g / m². 2 ~150g / m 2 It is preferable.

[0053] As an example of the filter film 10, Figure 1 shows a strip-shaped hot melt spray adhesive fiber layer 12 provided vertically and continuously. However, as shown in Figure 3, the strip-shaped hot melt spray adhesive fiber layer 12 may also be provided horizontally and continuously (Figure (a)), diagonally downward to the right and continuously (Figure (b)), or diagonally upward to the right and continuously (not shown). Alternatively, the strip-shaped hot melt spray adhesive fiber layer 12 may be intermittently oriented horizontally (Figure (c)), intermittently oriented diagonally downward to the right (not shown), or intermittently oriented diagonally upward to the right (not shown). Alternatively, the strip-shaped hot melt spray adhesive fiber layer 12 may be in a continuously intermittent grid pattern of horizontal and vertical directions (Figure (d)), or in a continuously intermittent grid pattern of diagonally downward-right and diagonally upward-right directions, or in a repeating diamond shape (not shown), or in a grid pattern with intermittent intersections of horizontal and vertical directions (Figure (e)), or in a continuously intermittent grid pattern with intermittent intersections of diagonally downward-right and diagonally upward-right directions, or in a repeating diamond shape (not shown). Furthermore, along the outer periphery of the filter film 10, a single hot melt spray adhesive fiber layer 12 may be continuously spaced (Figure (f)) or intermittently spaced (not shown), or a plurality of hot melt spray adhesive fiber layers 12 may be arranged in parallel, progressively smaller and continuously spaced (not shown) or intermittently spaced (not shown).

[0054] As shown in Figure 4, the filter film 10 may have a release layer 15 attached so as to cover the filter layer 11 together with the hot melt spray adhesive fiber layer 12. The filter layer 11 may have the words "This side is the adhesive side" printed on it (Figure (a)), or the release layer 15 may have the same words printed on it (Figure (b)). The filter film 10 may also have a warning printed on the side without the hot melt spray adhesive fiber layer 12, such as "The opposite side is the ventilation fan side."

[0055] Such a filter film 10 can be manufactured as follows, with reference to Figure 5, which shows a schematic diagram of the filter film manufacturing method of the present invention. The raw material pellets 22 of the hot melt spray adhesive are heated and melted, and the molten hot melt spray adhesive 22' is sprayed in a fibrous manner from a nozzle 23 onto one side 11c of a filter layer 11 made of nonwoven fabric that is fed out from a nonwoven fabric roll 31, thereby attaching a strip-shaped hot melt spray adhesive fiber layer 12 (see Figure 1) as it is fed by a roller 30. At this time, air is sprayed 24 from the outer circumference of the nozzle 23 in the direction of the spray 25 to adjust the width W1 of the strip-shaped hot melt spray adhesive fiber layer 12. By arranging multiple nozzles 23 in parallel, for example, a vertically oriented strip-shaped hot melt spray adhesive fiber layer 12 (see Figure 1) can be formed.

[0056] Instead of spraying air 24 in a circular pattern around the outer circumference of the nozzle 23, the air may be sprayed 24 evenly from four directions around the outer circumference of the nozzle 23, or the air may be sprayed 24 from two directions along the strip-shaped hot melt spray adhesive fiber layer 12 around the outer circumference of the nozzle 23.

[0057] The diameter and amount of hot melt spray adhesive fibers 12a in the hot melt spray adhesive fiber layer 12 can be controlled by adjusting the conditions under which spraying is performed, for example, the diameter of the discharge hole of the nozzle that sprays the molten hot melt spray adhesive, and the flow rate and flow rate of the air injection 24 from the outer circumference of the nozzle 23 in the direction of spraying 25 when spraying.

[0058] By having a step to form such a hot melt spray adhesive fiber layer 12, a filter film 10 can be manufactured and obtained having a gap region 13 in which the hot melt spray adhesive fibers 12a of the hot melt spray adhesive fiber layer 12 are entangled and adhere to the outermost nonwoven fabric fibers 11b on one side 11c of the filter layer 11, while the filter layer 11 is exposed. If necessary, a release sheet unwound from the release sheet roll 35 is applied to attach a release layer 15 to the filter layer 11 on the hot melt spray adhesive fiber layer 12 side, and if necessary, it is cut to a predetermined size with a cutter 36. Alternatively, instead of cutting with the cutter 36, the filter film may be wound onto a roll (not shown), unwound as needed, and then cut to the desired size.

[0059] The filter film 10 is used as follows. First, cut the filter film to the desired size of the object to be adhered to 40. Peel off the release layer 15 from the filter film 10 and attach it to the object to be adhered to 40, for example, the intake side of the range hood of a kitchen exhaust fan. After a predetermined period, when the filter film 10 becomes dirty and the amount of airflow decreases, peel off the filter film 10 and replace it with a new one.

[0060] The new filter membrane 10 has sufficient air permeability and sufficient adhesive strength, so it will not peel off. When replacing the filter membrane 10, it does not leave any residue or marks. Because the filter membrane 10 has a simple structure, it is easy to apply and when replacing it, it only requires peeling it off and sticking it on, making it highly versatile. [Examples]

[0061] The following will provide a detailed description of examples to which the present invention is applied, and comparative examples to which the present invention is not applied, with a comparative example.

[0062] (Example 1) The nonwoven fabric used to form the filter layer 11 is product name n04035p (basis weight 35g / m²) manufactured by Kinsei Paper Co., Ltd. 2Using polyester, Molesco Melt (a product name of MORESCO Corporation), a synthetic rubber-based thermal bond, was used as the hot melt spray adhesive raw material. As shown in Figure 5, the hot melt spray adhesive raw material was melted at 180°C, and sprayed 25 was performed from a nozzle 23 with a nozzle diameter of 0.2 mm, along with air injection at 210°C, adjusting the amount of adhesion shown in Table 1 onto the outermost nonwoven fabric fibers 11b on one side 11c of the filter layer 11, thereby forming hot melt spray adhesive fibers 12a with a fiber diameter of 50 to 200 μm, and obtaining a filter film 10 in which multiple hot melt spray adhesive fiber layers 12 were attached vertically as shown in Figure 1, in a strip shape with a width W1 of 5 mm and a gap region width W2 of 10 mm.

[0063] (Performance evaluation test 1: Peel strength measurement test) The resulting filter film 10 was subjected to a 180° peel strength test in accordance with JIS Z 0237;2022 (Test Methods for Adhesive Tapes and Adhesive Sheets), measuring the peel strength in the longitudinal direction (the direction in which the strip extends) and the transverse direction (the direction perpendicular to the direction in which the strip extends). Both longitudinal and transverse directions were evaluated in two stages: high for 700 g / 10 cm or more, and low for less than that. The results are summarized in Table 1.

[0064] (Performance evaluation test 2: Air permeability measurement test) The obtained filter film 10 will be tested using a Frazil-type testing machine in accordance with JIS L 1096 A method. Five test pieces of approximately 200 mm x 200 mm will be taken, mounted in the Frazil-type testing machine, air will be drawn in to a pressure of 125 Pa, and the airflow rate at that time will be measured. The air permeability (cc / cm²) will be calculated from the airflow rate and the test area. 2 The air permeability was measured by calculating the air permeability (s). Blank 303 (cc / cm 2 Approximately 80% of / S is 240 (cc / cm³) 2 We evaluated the results in two stages: high for scores above / S and low for scores below that. The results are summarized in Table 1.

[0065] (Performance evaluation test 3: Residue evaluation test) The obtained filter film 10 was peeled off after 60 minutes and evaluated for any remaining residue. A four-level evaluation was used: ◎ if there was no visible residue and no residue felt when touching the substrate, ○ if there was no visible residue but a small amount felt when touching the substrate, △ if there was no visible residue but a sticky residue felt when touching the substrate, and × if any visible residue was present. The results are summarized in Table 1.

[0066] [Table 1]

[0067] (Comparative Example 1) A filter film of Comparative Example 1 was obtained in the same manner as in Example 1, except that the entire surface was made a hot-melt spray adhesive fiber layer instead of the strip-shaped hot-melt spray adhesive fiber layer 12 in Example 1. This filter film was tested in the same manner as in performance evaluation tests 1 to 3 of Example 1. The results are summarized in Table 1.

[0068] (Comparative Example 2) A filter film of Comparative Example 2 was obtained in the same manner as in Example 1, except that the strip-shaped hot-melt spray adhesive fiber layer 12 in Example 1 was replaced with the same adhesive component applied in 1 mm strips instead of being sprayed. This filter film was tested in the same manner as performance evaluation tests 1 to 3 of Example 1. The results are summarized in Table 1.

[0069] (Comparative Example 3) In Comparative Example 3, instead of using a strip-shaped hot-melt spray adhesive fiber layer 12 in Example 1, the same adhesive component was applied to the entire surface in a 5 mm wide strip, rather than by spraying, to obtain the filter film of Comparative Example 3. This filter film was tested in the same manner as in performance evaluation tests 1 to 3 of Example 1. The results are summarized in Table 1.

[0070] As is clear from Table 1, the filter film 10 of Example 1, despite having only a strip-shaped hot-melt spray adhesive fiber layer 12 made of spray adhesive fibers, exhibited 180° peel strength in both the longitudinal and transverse directions approximately 2 to 3 times stronger than the filter film having a hot-melt spray adhesive fiber layer 12 covering the entire surface, as in Comparative Example 1. Furthermore, the filter film 10 of Example 1 exhibited 180° peel strength in both the longitudinal and transverse directions approximately 2 to 3 times stronger than the filter film of Comparative Example 2, which had adhesive applied in a strip-shaped manner. On the other hand, the filter film 10 of Example 1, despite having only a strip-shaped hot-melt spray adhesive fiber layer 12, showed almost the same 180° peel strength in both the longitudinal and transverse directions as the filter film of Comparative Example 3, which had adhesive applied to the entire surface.

[0071] Furthermore, as is clear from Table 1, the filter membrane 10 of Example 1 showed air permeability almost equivalent to that of the filter membranes of Comparative Examples 1 and 2, and was not significantly inferior to that of the blank (nonwoven fabric only). However, it showed air permeability about 1.5 times higher than that of the filter membrane of Comparative Example 3.

[0072] Furthermore, as is clear from Table 1, the filter film of Comparative Example 1, which, like the filter film 10 of Example 1, has a hot-melt spray adhesive fiber layer but is applied to the entire surface, showed considerable residue after peeling. On the other hand, the filter film of Comparative Example 2, which had an adhesive applied in a strip instead of hot melt, showed some residue after peeling. In addition, the filter film of Comparative Example 3, which had an adhesive applied to the entire surface, showed a very large amount of residue after peeling. In contrast, the filter film 10 of Example 1 showed absolutely no residue after peeling.

[0073] These results demonstrate that the filter film 10 of Example 1 to which the present invention is applied has sufficient air passage through the filter layer 11, which has voids, and the hot melt spray adhesive fiber layer 12 also has voids, allowing the filter layer to fully exhibit its ability to remove oil and dust and suppress clogging for a long period of time. Furthermore, because the hot melt spray adhesive fiber layer 12 is thin and strip-shaped, with a small contact area with the object to be attached 40, and the fibers of the hot melt spray adhesive fiber layer 12 are intertwined with the nonwoven fabric fibers of the filter layer 11, it is less likely to leave residue or peeling marks. Moreover, it has been demonstrated that this filter film has adhesive strength equivalent to that of a filter film where the adhesive is applied in layers without gaps, despite the hot melt spray adhesive fiber layer being thin and strip-shaped with a small contact area with the object to be attached. [Industrial applicability]

[0074] The filter membrane to which the present invention is applied and the method for manufacturing the same can be used as a removable membrane filter at various air inlets and outlets, both for home and commercial use, such as the intake side of ventilation fans and range hoods in cooking areas like home kitchens and commercial kitchens, the intake side and exhaust side of ventilation equipment in work sites and factories, and the outlet surface of air conditioning equipment such as air conditioners. [Explanation of Symbols]

[0075] 10 is the filter film, 11 is the filter layer, 11a is the nonwoven fabric fiber, 11b is the outermost nonwoven fabric fiber, 11c is one side, 12 is the hot melt spray adhesive fiber layer, 12a is the hot melt spray adhesive fiber, 12a' is the strip-shaped end, 12a'' is the vicinity of the end 12a', 13 is the gap region, 15 is the release layer, 22 is the raw material pellet of the hot melt spray adhesive, 22' is the molten body of the hot melt spray adhesive, 23 is the nozzle, 24 is the air injection, 25 is the spray injection, 30 is the roller, 31 is the nonwoven fabric roll, 35 is the release sheet roll, 36 is the cutter, and 40 is the object to be adhered.

Claims

1. A filter film having a gap region in which the filter layer is exposed, wherein the filter layer is made of a nonwoven fabric with a basis weight of 25 to 150 g / m² and a strip-shaped hot melt spray adhesive fiber layer with a basis weight of 8 to 15 g / m² and a fibrous pattern is located on one side of the filter layer, A filter film characterized in that hot melt spray adhesive fibers, having a diameter of 50 to 200 μm and being thicker than the fiber diameter of the nonwoven fabric, are entangled and attached to the outermost nonwoven fabric fibers on one side of the filter layer.

2. The filter film according to claim 1, characterized in that a plurality of the hot melt spray adhesive fiber layers have the gap region between adjacent strip-shaped sections.

3. The filter film according to claim 1, characterized in that the gap region has breathability due to the voids between the fibers of the nonwoven fabric, and the region of the hot melt spray adhesive fiber layer has breathability due to the voids between the hot melt spray adhesive fibers and the voids between the fibers of the nonwoven fabric to which it is attached.

4. The filter film according to claim 1, characterized in that the hot melt spray adhesive fiber layer is made of a rubber-based hot melt spray adhesive, an acrylic-based hot melt spray adhesive, or a urethane-based adhesive, thereby having adhesive properties to the object to be adhered.

5. The filter film according to claim 1, characterized in that the hot melt spray adhesive fiber layer is oriented vertically, horizontally, and / or diagonally on the filter layer.

6. The filter film according to claim 1, characterized in that the hot melt spray adhesive fiber layer is in the form of continuous or intermittent strips.

7. The filter film according to claim 1, characterized in that the hot melt spray adhesive fiber layer is intermittently arranged in a grid pattern.

8. The filter film according to claim 1, characterized in that the hot melt spray adhesive fiber layer is in the shape of a strip with a width of 3 to 20 mm.

9. The filter film according to claim 1, characterized in that the hot melt spray adhesive fiber layer is in the shape of a strip by making the gap region 3 to 40 mm wide.

10. The filter film according to claim 1, characterized in that the area of ​​the hot melt spray adhesive fiber layer is 25 to 60% of the area of ​​the filter layer.

11. The filter film according to claim 1, characterized in that a release layer is attached to the hot melt spray adhesive fiber layer.

12. A method for manufacturing a filter film, characterized by a process of producing a filter film using hot melt spray by heating and melting a hot melt spray adhesive and spraying it in a fibrous manner from a nozzle onto one side of a filter layer made of nonwoven fabric with a basis weight of 25 to 150 g / m², thereby attaching a strip-shaped hot melt spray adhesive fiber layer with a basis weight of 8 to 15 g / m² and a fibrous pattern, thereby creating a filter film having gap regions in which the filter layer is exposed while hot melt spray adhesive fibers with a fiber diameter of 50 to 200 μm, which are thicker than the fiber diameter of the nonwoven fabric, are entangled and attached to the nonwoven fabric fibers on one side of the filter layer.

13. The filter film manufacturing method according to claim 12, characterized in that air is blown from the air nozzle toward the tip of the nozzle so as not to spread in the spraying direction of the hot melt spray adhesive being sprayed, thereby forming the strip-shaped hot melt spray adhesive fiber layer.

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