Filter Structure

Abstract

To provide a filter structure that can be easily and neatly attached to the opening of a metal filter of a range hood. [Solution] The filter body 11 of the filter structure 10 is rectangular and sized to cover the entire surface of the metal filter. The release sheet 13 is divided into an upper release sheet 13b and a lower release sheet 13c by a slit 13a formed within a slit-forming region that is 10% to 50% of the upper edge of the filter body. The adhesive layer 12 consists of an upper adhesive layer 12h and other adhesive layers, and the upper adhesive layer has a vertical width of 20 mm to 50 mm, which is larger than the width of the other adhesive layers. The proportion of the adhesive layer in the upper region of the filter body where the upper adhesive layer is formed is larger than the proportion of the adhesive layer in the region excluding the upper region from the slit-forming region. The adhesive strength is adjusted so that the upper adhesive layer will not peel off even if the upper release sheet is peeled off and the lower release sheet is peeled off while the upper adhesive layer remains attached to the upper edge of the metal filter.

Description

[Technical Field]

[0001] The present invention relates to a filter structure that is attached to the opening of a range hood to prevent the opening from becoming dirty. [Background technology]

[0002] Range hoods, which are installed above ranges in system kitchens and other appliances for ventilation, are prone to becoming soiled with oil from cooking. Cleaning the opening of the range hood, including the interior where the ventilation fan is located, is particularly time-consuming, so various attempts have been made to prevent this.

[0003] For example, as disclosed in Patent Document 1, a filter structure is known that is attached to the opening of a so-called boot-type range hood and filters the air passing through the opening.

[0004] Also known is a filter structure in which an adhesive layer is laminated on one side of a breathable filter body such as a nonwoven fabric, as disclosed in Patent Document 2. According to the filter structure of Patent Document 2, the adhesive layer is attached so as to cover the opening of the range hood that is covered with the metal filter, making it easy to attach to the range hood. In this type of filter structure, a release sheet is usually laminated on the surface of the adhesive layer to prevent the adhesive layer from unintentionally sticking when not in use, and this release sheet is peeled off when in use to expose the adhesive layer. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-250151 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-85927 Summary of the Invention [Problem to be solved by the invention]

[0006] By the way, in the case of a typical range hood with a metal filter, the length of the opening in the vertical direction is about 350mm to 400mm, and the length of the opening in the horizontal direction is about 600mm to 900mm, so the dimensions of the filter structure are also quite large. Therefore, it is not easy to handle and may not be easily attached to the range hood.

[0007] More specifically, the dimensions of the release sheet that covers the adhesive layer of the filter structure are similarly large, so if the release sheet is completely removed before the installation work on the range hood is carried out, the exposed area of ​​the adhesive layer will be extremely large, and it will be unavoidable for the adhesive layers to come into contact with each other and stick together during the process of attaching them from top to bottom, for example.

[0008] Furthermore, even during the process of peeling the release sheet from the adhesive layer, the filter body tends to naturally roll inward due to its large dimensions, and the adhesive layers stacked on the filter body are likely to come into contact with each other and stick together as they roll up. Once the adhesive layers have stuck together in this way, it is difficult to separate them cleanly, and the filter structure often becomes unusable.

[0009] Furthermore, it is possible to first peel off only part of the release sheet, for example the upper half, before attaching it to the range hood, and then gradually peel off the lower half as the work progresses, but the part of the release sheet that has already been peeled off will hang down and get between the filter body and the range hood, hindering the work. Therefore, during the application process, the peeled-off release sheet may become caught or caught between the adhesive layer and the range hood, or may get in the way and cause wrinkles in the filter body, which could prevent the application process from going smoothly.

[0010] Furthermore, if you try to peel off the lower half of the release sheet by pulling it downward during the installation process, the force may exceed the adhesive strength of the entire adhesive layer on the upper half of the filter body, and the entire filter body may peel off from the range hood.

[0011] As described above, with conventional filter structures, regardless of the method used to attach them to a range hood, in order to attach them neatly to the metal filter that covers the opening, the worker required familiarity, skill, and careful handling.

[0012] Therefore, the problem to be solved by the present invention is to provide a filter structure that can be attached to an opening of a range hood so as to cover the metal filter, without requiring the worker to be familiar with, be skilled in, or handle it carefully, and that can be easily and neatly installed. [Means for solving the problem]

[0013] In order to solve the above-mentioned problems, the filter structure is configured to include a breathable sheet-like filter body, an adhesive layer laminated on part of one side of the filter body and capable of being attached to the range hood, and a release sheet removably laminated on the surface of the adhesive layer. The filter body is rectangular with top, bottom, left and right sides, and has dimensions that allow it to cover the entire surface of the metal filter, which is also rectangular.The release sheet is divided into an upper release sheet and a lower release sheet by forming slits that are approximately parallel to the top and bottom sides of the filter body, and the slits are formed within a slit formation area that is 10% to 50% of the vertical length of the filter body from the top side. Furthermore, the adhesive layer is composed of an upper adhesive layer formed along the upper edge of the filter body and other adhesive layers, the vertical width of the upper adhesive layer being 20 mm or more and 50 mm or less, which is larger than the width of the other adhesive layers, the proportion of the adhesive layer in the upper region of the filter body where the upper adhesive layer is formed being larger than the proportion of the adhesive layer in the remaining region excluding the upper region from the slit formation region, and the adhesive strength of the upper adhesive layer is adjusted so that the upper adhesive layer will not peel off from the metal filter even if only the upper release sheet of the release sheet is peeled off from the adhesive layer and the lower release sheet is pulled and peeled off with only the upper adhesive layer of the adhesive layer attached to the upper edge side of the metal filter.

[0014] With this configuration, the release sheet is divided into upper and lower portions of the filter structure by the slits, so that it is possible to peel off only the upper release sheet in parts, rather than peeling off the entire sheet at once. Therefore, while the filter body would naturally be rolled inward at the point where the release sheet was peeled off, the size of the release sheet peeled off before the application work is smaller than the overall size of the filter structure, so this roll-in can be suppressed compared to when the entire release sheet is peeled off. Combined with the fact that the area where the adhesive layer is exposed is limited, this also suppresses the adhesive layers from coming into contact with each other and sticking together.

[0015] In addition, because the upper release sheet is removed, there is no risk of parts of the release sheet hanging down between the filter body and the range hood as in the past, which prevents the already peeled part of the release sheet from getting caught or rolled up between the adhesive layer and the range hood, and also prevents wrinkles from forming in the filter body.

[0016] Furthermore, because the upper adhesive layer has a large vertical width, the adhesive strength (or holding strength) of the entire upper adhesive layer is strong enough to withstand the force (pulling force) applied to peel off the lower release sheet during subsequent installation work, preventing the filter body from peeling off from the metal filter of the range hood during installation.

[0017] The adhesive strength of the adhesive layer, excluding the upper adhesive layer in the slit formation area, is reduced by limiting the width from top to bottom and the proportion of the area, preventing the filter body from being peeled off from the range hood without requiring a large amount of force or damaging the metal filter, etc. Furthermore, limiting the adhesive layer ensures breathability, ensuring air filtration performance and dirt adhesion performance.

[0018] In the filter structure of the invention, it is preferable that the vertical length of the filter body is 300 mm or more and 500 mm or less, the slit formation area is in the range of 30% to 50% of the vertical length of the filter body from the upper side, the proportion of the adhesive layer in the upper area of ​​the filter body where the upper adhesive layer is formed is 80% or more and 100% or less, and the proportion of the adhesive layer in the remaining area excluding the upper area from the slit formation area is 5% or more and 40% or less.

[0019] By configuring the filter body in this way, it becomes a suitable size for a filter structure to be attached to the opening of a typical boot-type range hood. By making the slit formation area 30% to 50% of the vertical length of the filter body from the top edge, the size of the release sheet that is peeled off before attaching it to the range hood is more appropriately limited, which sufficiently prevents the filter body from naturally rolling inward, and therefore also sufficiently prevents the adhesive layers from coming into contact and sticking together before attachment to the range hood. By setting the proportion of the adhesive layer in the upper region where the upper adhesive layer is formed and the proportion of the adhesive layer in the other regions excluding the upper region within the above ranges, it is possible to ensure sufficient adhesive strength in the upper part of the filter layer while ensuring sufficient breathability and removability after use in the regions other than the upper region.

[0020] In the filter structure according to the present invention, it is preferable that the adhesive layer is formed at a position that does not overlap with the slits of the release sheet.

[0021] With this configuration, no adhesive layer is formed around the slits, so even if a slit is formed with a slitting blade during the production of the filter structure, the adhesive does not adhere to the slitting blade, preventing subsequent slits from being formed cleanly and causing manufacturing defects. Similarly, because no adhesive layer is formed around the periphery of the slit, when the upper release sheet is peeled off from the adhesive layer, no adhesive force acts on the periphery of the slit at the end, making it possible to peel off the upper release sheet smoothly.

[0022] In the filter structure of the present invention, it is preferable to adopt a configuration in which the thickness of the filter body is 0.3 mm or more and 15 mm or less, the thickness of the release sheet is 12 μm or more and 75 μm or less, and the maximum peel load of the adhesive layer is 0.004 N / mm or more and 0.18 N / mm or less.

[0023] When the thickness of the filter body is 0.3 mm or more and 15 mm or less, the filter body is prevented from breaking during attachment work, and has good conformability to metal filters, etc. Furthermore, the filter body can achieve both the ability to capture oily stains contained in oily smoke and dust contained in the air, and breathability. If the thickness of the release sheet is 12 μm or more, the rigidity will be good and the sheet will be less likely to become wavy when laminated on the surface of the adhesive layer. If the thickness of the release sheet is 75 μm or less, the flexibility will be good and the sheet will easily follow the filter body when the filter structure is bent or folded. This prevents the release sheet from lifting off the surface of the adhesive layer, preventing fiber debris from adhering to the adhesive layer and reducing adhesive strength. This also makes it possible to fold and package the filter structure, improving handling. If the maximum peel load of the adhesive layer is 0.18 N / mm or less, when a peel force is applied to the adhesive layer by pulling the filter structure or the like to forcibly peel it off, the operation becomes smooth and does not cause damage or breakage to the outer surface of the metal filter or the like to which the adhesive layer is attached.If the maximum peel load of the adhesive layer is 0.004 N / mm or more, the adhesive layer is prevented from unintentionally peeling off from the outer surface of the metal filter or the like.

[0024] In the filter structure of the invention, the opening of the range hood has an upper cover that covers the top of the opening, an opening body with a built-in ventilation fan, and the metal filter that is placed over the opening body, and the opening edge is lined with, from top to bottom, the frame of the upper cover, a locking frame of the opening body for locking the metal filter, and the metal filter, and a gap is formed between the locking frame and the metal filter, and it is preferable to adopt a configuration in which the vertical width of the upper adhesive layer is set to be larger than the combined length of the vertical length of the locking frame and the gap length.

[0025] In this way, by setting the vertical width of the upper adhesive layer to be larger than the combined length of the vertical length of the locking frame of the opening body and the gap length between the locking frame and the metal filter, even if the filter body is slightly misaligned vertically when the worker attaches it to the opening of the range hood, the entire width of the upper adhesive layer will fit into the locking frame and gap, where the adhesive force is essentially ineffective, preventing the entire filter body from peeling off from the range hood. Therefore, the upper adhesive layer is usually attached to the upper cover frame and metal filter, spanning the gap between the retaining frame and the metal filter, or at least over a wide area of ​​the upper cover frame or a wide area of ​​the metal filter, thereby preventing the layer from peeling off due to insufficient adhesive strength. In addition, the upper adhesive layer has a wide vertical width and can be attached so as to span the locking frame and gap, which makes it possible to prevent oil stains from entering the gap or from entering the inside of the range hood through the gap.

[0026] In the filter structure according to the present invention, it is preferable to employ a configuration having an indicator made of an adhesive layer that can be visually recognized as a mark indicating when it is time to replace the filter body after the filter body becomes soiled.

[0027] The difference in the degree of dirt adhesion between the areas of the filter body where the adhesive layer has been laminated and where breathability is intact creates a color contrast. By making this adhesive layer function as a guide, or indicator, for when it is time to replace the filter body, it becomes easier to visually tell when it is time to replace it, improving convenience. [Effects of the Invention]

[0028] The filter structure of the present invention is configured as described above, and can be easily and neatly attached to a range hood without requiring the operator to be familiar with, skilled, or careful in handling. [Brief explanation of the drawings]

[0029] [Figure 1] Front view of the filter structure [Figure 2] Rear view of filter structure [Figure 3] A perspective view of the filter structure from the back [Figure 4] Enlarged front view of the main part of the filter structure [Figure 5]Front view showing the filter body installed [Figure 6] Enlarged perspective view of the main part showing the installation state of the filter body DETAILED DESCRIPTION OF THE INVENTION

[0030] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The filter structure 10 of the embodiment shown in Figures 1 to 4 is attached to a kitchen range hood R, more specifically, to an opening O which is a ventilation opening of the range hood R, as shown in Figures 5 and 6, so as to cover the metal filter F placed thereon, and prevents the range hood R, especially the opening, from becoming dirty with oily smoke, oil droplets, etc.

[0031] 1 to 3, filter structure 10 of the embodiment has a rectangular shape in plan view with top, bottom, left, and right sides, and has a three-layer structure consisting of, from top to bottom in the thickness direction in Fig. 1, a filter body 11, an adhesive layer 12, and a release sheet 13. In Fig. 2, the portion of adhesive layer 12 that can be seen through transparent release sheet 13 is schematically dotted, and Fig. 3 shows a state in which part of release sheet 13 has been peeled off from filter structure 10. When in use, the filter is attached so that the adhesive layer 12 faces the range hood R and the filter body 11 faces the opposite side, i.e., the range side located below the range hood R, as shown in FIG.

[0032] The vertical and horizontal dimensions of the filter body 11 of the filter structure 10 are not particularly limited, but examples of lengths L in the vertical direction (depth direction) shown in Figure 4 that match the dimensions of the opening of a range hood R in a typical boot-type kitchen can be 300 mm to 500 mm, and a length in the width direction (opening direction) of 600 mm to 900 mm. If the dimensions are too large, it will be inconvenient to handle and there is a risk that multiple people will have to do the installation work when attaching it to the range hood R, and if the dimensions are too small, there will be exposed areas on the range hood R, and one filter body 11 will not be able to adequately prevent it from getting dirty.

[0033] 1 to 3 is a flexible sheet made of fibers. The filter body 11 is breathable and filters the air passing through it, trapping oily stains and other contaminants.

[0034] The vertical and horizontal dimensions of the filter body 11 of the filter structure 10 are not particularly limited, but examples of lengths that match the dimensions of the opening of a range hood R in a typical boot-type kitchen include a vertical (depth) length of 300 mm to 500 mm, and a width (width) length of 600 mm to 900 mm, as indicated by L in Figure 4. If the dimensions are too large, it will be inconvenient to handle and there is a risk that multiple people will have to do the installation work when attaching it to the range hood R, and if the dimensions are too small, there will be exposed areas on the range hood R, and one filter body 11 will not be able to adequately prevent it from getting dirty.

[0035] The material of the filter body 11 is not particularly limited, and examples include woven fabric and nonwoven fabric, but nonwoven fabric is preferred as it has excellent dirt capturing performance, cost, and conformability to the object to which it is attached. The material of the nonwoven fabric is not particularly limited, and examples include known synthetic fibers and natural fibers such as polyester fibers such as polyethylene terephthalate (PET), polyamide fibers, polyolefin fibers such as polypropylene, and acrylic fibers including modacrylic, but as a filter to be attached to the range hood R, a nonwoven fabric made of polyester fibers is preferred as it has excellent oil stain trapping properties and can be manufactured inexpensively. In addition, to impart flame retardancy to the nonwoven fabric, a flame retardant treatment may be applied, such as by blending a flame retardant material into the fibers or by attaching a flame retardant material to the surface of the nonwoven fabric. The method for producing the nonwoven fabric is not particularly limited, and examples thereof include a thermal bond method, a chemical bond method, and a spun bond method.

[0036] The thickness of the filter body 11 is not particularly limited, but is preferably in the range of 0.3 mm to 15 mm, and more preferably in the range of 0.5 mm to 12 mm. The basis weight is also not particularly limited, but is preferably in the range of 20 g / m 2 to 400 g / m 2 and a more preferable range is 30 g / m 2 to 300g / m 2 is. Within these ranges, the filter body 11 has an excellent ability to capture oily and dusty dirt, and does not adversely affect the ventilation performance of the range hood R.

[0037] The adhesive layer 12 shown in FIGS. 1 to 3 is formed by laminating an adhesive agent arranged in a predetermined pattern in a plan view on the filter body 11. There are no particular limitations on the adhesive that forms the adhesive layer 12, and examples that can be used include two-component adhesives containing a base agent and a curing agent, such as two-component polyurethane adhesives, and hot-melt adhesives, such as acrylic hot-melt adhesives. If necessary, the adhesive may contain additives such as tackifiers that improve adhesion, ultraviolet absorbers, fillers, colorants, antioxidants, antifoaming agents, and light stabilizers, as well as various additives that suppress a decrease in adhesive strength at low temperatures and adhesive residue.

[0038] The maximum peel load of the adhesive layer 12 as a whole is not particularly limited, but is preferably 0.004 N / mm or more and 0.18 N / mm or less. If the maximum peel load is less than 0.004 N / mm, there is a risk that the filter body 11 will peel off unintentionally when attached to the opening of the range hood, and if it exceeds 0.18 N / mm, there is a risk that the metal filter will be damaged or glue residue will be left behind when peeling the used filter body 11 from the opening of the range hood.

[0039] 1 to 3, the adhesive layer 12 is configured with strip-shaped unit adhesive portions 12a of approximately the same shape arranged in parallel in a direction corresponding to the width direction (opening direction) of the range hood R. The number of parallel rows of the unit adhesive portions 12a is not particularly limited, but in this embodiment, they are arranged in four rows. Between adjacent adhesive units 12a, there are first missing portions 12b where no adhesive exists, and the filter body 11 is exposed. By cutting this first missing portion 12b in a direction corresponding to the width direction of the range hood R with a cutting tool such as scissors, the adhesive does not adhere to the cutting tool and the width of the filter structure 10 can be adjusted to match the width of the opening O of the range hood R. In addition, perforations or half cuts can be made in the relevant portion as appropriate to make cutting easier.

[0040] Here, the width of the unit adhesive portion 12a in the left-right direction is not particularly limited, but can be, for example, 130 mm to 220 mm. If the width of the unit adhesive portion 12a is too wide, it becomes difficult to finely adjust the width of the filter structure 10 by cutting the first missing portion 12b, and if the width is too narrow, the proportion of the adhesive layer 12 in the filter body 11 will be too high, which will hinder the breathability of the filter body 11, and as a result, this may have a negative impact on the ventilation performance of the range hood R.

[0041] As shown in FIGS. 1 to 3, each unit adhesive portion 12a is made up of a frame portion 12c and a lattice portion 12d. The frame portion 12c has a vertically long frame shape consisting of top, bottom, left and right sides, and the lattice portion 12d is located inside the frame portion 12c and forms a diagonal lattice shape by the diagonal lines that run parallel in two directions intersecting each other.

[0042] 1 to 3, a display portion 12e is formed inside a part or all of the frame portions 12c of the unit adhesive portions 12a. The display portion 12e is made of an adhesive and forms part of the adhesive layer 12. When the filter structure 10 is in use, a color contrast arises over time due to the difference in the amount of dirt between areas where the adhesive layer 12 of the filter body 11 is not laminated, making it highly breathable and prone to dirt adhesion, and areas where the adhesive layer 12 is laminated, reducing breathability and making it difficult for dirt to adhere, and the indicator 12e of the adhesive layer 12 acts as a marker to visually indicate when it is time to replace the filter body 11.

[0043] The form of the display portion 12e is not particularly limited as long as it is conspicuous enough to serve as the above-mentioned landmark, but in the embodiment, it is in the form of letters saying "Please replace it" formed across all the unit adhesive portions 12a, and in the form of a picture of a character formed inside the frame portion 12c of every other unit adhesive portion 12a. Other possible shapes of the display section 12e include a heart shape, a circle, a clover shape, a spade shape, a diamond shape, a polygonal shape, and letters. The frame section 12c and the lattice section 12d may also be used as the display section. Furthermore, it is preferable that the adhesive be colorless and transparent, since if the pattern of the display portion 12e is invisible or difficult to see when the filter structure 10 is unused, the visual effect that appears on the filter body 11 after the filter structure 10 has been used will be greater.

[0044] As shown in Figures 1 to 3, a second missing portion 12f where no adhesive is present is formed in the middle portion of the adhesive layer 12 in the vertical direction, extending in the left-right direction so as to cross all of the unit adhesive portions 12a. As shown in FIG. 3, the second notch 12f is formed at a position overlapping with a slit 13a formed in a slit formation region of the release sheet 13, which will be described later. The vertical width of the second cutout 12f is not particularly limited, but can be, for example, 5 mm or more and 15 mm or less. If the width is less than 5 mm, there is a risk that the adhesive will adhere to the slit blade when creating slits 13a in release sheet 13, which will be described later. Also, if the width exceeds 15 mm, the area where no adhesive is present will become too large, and release sheet 13 near slits 13a may be accidentally turned over, or when attached to opening O of range hood R, the portion of filter body 11 that does not adhere to the opening corresponding to second missing portion 12f will become large, creating a gap between filter body 11 and opening O, which may allow oily smoke containing oily stains to enter opening O of range hood R directly through the gap without passing through filter body 11, or the adhesive strength to the range hood opening may be insufficient.

[0045] As shown in Figures 1 to 3, a third missing portion 12g where no adhesive is present is formed at the lower edge of the adhesive layer 12, extending in the left-right direction so as to cross all of the unit adhesive portions 12a. The third notch 12g separates the bottom side of the frame 12c from the top side and the left and right sides of the frame 12c. The filter body 11 may be pierced into a protrusion that may be present at the lower edge of the opening O of the range hood R to assist in installation, and the presence of the third notch 12g at the position corresponding to the piercing prevents the filter body 11 from being easily pierced due to the presence of the adhesive layer 12 and prevents the adhesive from adhering to the protrusion, etc.

[0046] As shown in FIGS. 1 to 3, the upper side of the frame portion 12c of each unit adhesive portion 12a is an upper adhesive layer 12h that is wide in both the vertical direction. As shown in Figure 4, the vertical width W of the upper adhesive layer 12h is 20 mm or more and 50 mm or less, which is larger than the width of any of the other adhesive layers, such as the vertical width of the bottom edge of the frame portion 12c, the horizontal width of the left and right edges, the width of each intersecting diagonal grid line of the grid portion 12d, and the width of the lines of the letters and characters on the display portion 12e. Therefore, the adhesive strength of the upper adhesive layer 12h is greater overall than that of other portions, and when the filter body 11 is attached to the opening O of the range hood R in order from the top, the uppermost upper adhesive layer 12h adheres firmly first, which allows the subsequent attachment work to be carried out smoothly. Here, if the vertical width of the upper adhesive layer 12h is less than 20 mm, the adhesive strength will be insufficient and the filter body 11 may fall off during installation, and if it exceeds 50 mm, the overall air permeability of the filter body 11 will decrease, which may have a negative impact on the exhaust capacity of the range hood R.

[0047] As shown in FIG. 4, a minute gap G of about 3 mm to 6 mm is formed between the upper edge of the upper adhesive layer 12h and the upper side of the filter body 11, where no adhesive layer is present. This prevents the adhesive from adhering to the cutting blade when cutting the filter body 11 during the manufacture of the filter structure 10. The gap G also serves as a handle when peeling off the release sheet 13 from its edge. The upper adhesive layer 12h has both left and right sides inclined so that the entire shape is roughly trapezoidal. Therefore, the corners of the release sheet 13 are not stuck to the adhesive layer 12 and are raised, allowing the release sheet 13 to be peeled off more smoothly starting from these corners.

[0048] The type of adhesive constituting the adhesive layer 12 is not particularly limited, but as mentioned above, examples include urethane-based adhesives and acrylic-based adhesives, and those that have excellent removability and do not leave adhesive residue when peeled are preferred. It is also preferred to impart flame retardancy to the adhesive by adding a flame-retardant component. In the present invention, a hot-melt adhesive such as an acrylic hot-melt adhesive is used. The proportion of the area of ​​the adhesive layer 12 to the entire surface of the filter body 11 is not particularly limited, but is preferably 10% to 80%, more preferably 20% to 60%. Within these ranges, it is possible to prevent the area ratio from being too small, resulting in insufficient adhesive strength, or from being too large, resulting in high costs and impairing the breathability of the filter body 11.

[0049] The coating amount (dry weight) of the adhesive layer 12 is not particularly limited, but is preferably 5 g / m 2 More than 50g / m 2 The following can be given as examples. Within these ranges, problems such as insufficient adhesive strength due to a thickness that is too small, or leaving an adhesive layer as adhesive residue when peeled off due to a thickness that is too large, and increased costs can be prevented. The method for forming the adhesive layer 12 is not particularly limited, but examples include pattern printing and spray coating. In the case of spray coating, the filter body 11 can be used in a state where fine particles of adhesive are scattered over the entire surface or desired portions.

[0050] The release sheet 13 shown in FIG. 3 and the like is made of a synthetic resin film, but may also be a film made of a sheet of paper that has been given a release coating. The release sheet 13 protects the adhesive layer 12 of the filter structure 10, preventing the adhesive layer 12 from unintentionally sticking to articles or becoming soiled by dust or the like during the distribution or packaging stages before use. The material of the release sheet 13 is not particularly limited, and examples thereof include polyethylene terephthalate, polypropylene, and polyethylene, but a PET film is preferable because it is inexpensive and highly versatile. The release sheet 13 may also be made flame-retardant.

[0051] The thickness of the release sheet 13 is not particularly limited, but is preferably in the range of 12 μm or more and 75 μm or less, and more preferably in the range of 15 μm or more and 25 μm or less. Within these ranges, problems such as release sheet 13 being too thin and tearing, or being too thick and making it impossible to fold filter structure 10 when packaging, will not occur.

[0052] As shown by the dashed lines in Fig. 2 and the solid lines in Fig. 3, release sheet 13 has slits 13a formed in it that are substantially parallel to the upper and lower edges of filter body 11. This divides release sheet 13 into an upper release sheet 13b and a lower release sheet 13c in the vertical direction of filter structure 10. The slit 13a is formed within a slit formation region that corresponds to a range of 10% to 50% of the vertical length of the filter body 11 from the upper edge of the filter body 11, more preferably, a range of 30% to 50% of the vertical length of the filter body 11 from the upper edge. The distance D from the upper side of the filter body 11 to the slit 13a shown in FIG. 4 is not particularly limited, but can be, for example, 100 mm or more and 150 mm or less.

[0053] When attaching the filter structure 10 to the range hood R, first peel off only the upper release sheet 13b as shown in Figure 3, and then attach the exposed adhesive layer 12 to the opening O of the range hood R as shown in Figure 5 by running your hand along the opening O from the top to the middle. Next, the lower release sheet 13c is peeled off, and the adhesive layer 12 in that portion is attached from the middle to the bottom of the opening O of the range hood R. By following these steps, the filter body 11 can be attached neatly.

[0054] As shown in FIGS. 2 and 3, the slit 13a is formed at a position overlapping the second missing portion 12f of the adhesive layer 12. The second notch 12f has a predetermined width, and since there is no adhesive on the slit 13a, adhesive is prevented from adhering to the slit blade when the slit 13a of the filter structure 10 is made. Slits may be provided in areas other than slit 13a within the slit formation region, thereby further dividing lower release sheet 13c and enabling the attachment work to be performed in multiple stages with precision.

[0055] The filter structure 10 is configured as described above, and the upper region of the filter body 11 is defined between the upper edge of the filter body 11 and an imaginary line parallel to the upper and lower edges of the filter body 11 that passes through the lowest edge of the upper adhesive layer 12h. The vertical width of the upper region is the sum of the gap G in FIG. 4 and the width W of the upper adhesive layer 12h, and the lateral length of the upper region is equal to the lateral length of the filter structure 10. The proportion of the adhesive layer 12 consisting of the upper adhesive layer 12h in the upper region is very large, and even when the remaining region excluding the upper region is partitioned within the slit formation region on the filter body 11 where the slit 13a of the release sheet 13 can be formed, the proportion of the adhesive layer in the upper region is larger than the proportion of the adhesive layer in the remaining region.

[0056] Although there are no particular limitations on the proportion of the adhesive layer 12 that is the upper adhesive layer 12h in the entire upper region of the filter body 11, it is preferably 80% or more and 100% or less. If this proportion is less than 80%, the adhesive strength of the filter body 11 in the upper region to the range hood may be insufficient. The proportion of adhesive layer 12 in the entire remaining area of ​​filter body 11 is not particularly limited, but is preferably 5% to 40%. If this proportion is less than 5%, the adhesive strength of filter body 11 to the range hood in the remaining area may be insufficient, and if it exceeds 40%, breathability may be impaired, resulting in insufficient adhesion of dirt to filter body 11.

[0057] By appropriately adjusting the width of the upper adhesive layer 12h, the proportion of the adhesive layer 12 shown in the upper region, the selection of the adhesive, the position of the slit 13a in the release sheet 13, the interrelationship with the weight of the filter body 11, etc., the filter structure 10 has an adhesive strength that is set so that when the upper release sheet 13b is peeled off and the upper adhesive layer 12h of the exposed adhesive layer 12 is attached along the upper edge of the metal filter F covering the opening of the range hood, and then the lower release sheet 13c is pulled downward in this state, the upper adhesive layer 12h will not peel off from the metal filter F.

[0058] As shown in Fig. 5, when attaching filter body 11 to opening O of range hood R, in detail, the opening of range hood R has an upper cover U that covers the top of the opening, an opening body O with a built-in ventilation fan, and a metal filter F that covers the opening body O. Then, as shown in Fig. 6, on the edge of the opening, from top to bottom, the frame body U that forms part of the upper cover, the locking frame O that forms part of the opening body for locking the metal filter, and the metal filter F are arranged side by side, with a gap g formed between the locking frame O and the metal filter F.

[0059] Here, the width of the upper adhesive layer 12h in the vertical direction is 20 mm to 50 mm, which is set to be larger than the total length of the vertical length of the locking frame O in a typical range hood R and the gap length. By doing this, even if the filter body 11 is shifted slightly in the vertical direction when the worker attaches it to the opening of the range hood R, the entire width of the upper adhesive layer 12h will not be contained in the locking frame O of the opening body, where the adhesive force does not actually work due to a large step with the frame body U of the upper cover, or in the gap g, where the adhesive force does not work at all. Therefore, the upper adhesive layer 12h is normally attached to the upper cover frame U and the metal filter F, vertically spanning the retaining frame O and the gap g. Even if there is a significant vertical shift, the upper adhesive layer 12h is at least attached to a wide area of ​​the upper cover frame U or a wide area of ​​the metal filter F, preventing peeling due to insufficient adhesive strength. Furthermore, the upper adhesive layer 12h has a large vertical width and can be attached so as to straddle the locking frame O and the gap g, which makes it possible to prevent oil stains from entering the gap g or from entering the inside of the range hood R through the gap g, thereby contaminating the fan.

[0060] The embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is defined by the claims, and all modifications and variations within that scope and in a meaning equivalent to the claims are intended to be included. [Explanation of symbols]

[0061] 10 Filter Structure 11 Filter body 12 Adhesive layer 12a Unit adhesive part 12b First missing part 12c frame 12d lattice part 12e Display 12f Second missing part 12g Third missing part 12h top adhesive layer 13 Peel-off sheet 13a Slit 13b Upper release sheet 13c Lower release sheet R Range Hood O Opening (opening body, locking frame) F Metal filter U Upper cover (frame) g Gap

Claims

1. A filter structure for filtering gas passing through an opening of a range hood, the filter structure being attached to cover the opening, including the metal filter, a breathable sheet-like filter body; an adhesive layer laminated on a part of one surface of the filter body and attachable to the range hood; a release sheet releasably laminated on the surface of the adhesive layer, The filter body is rectangular having top, bottom, left, and right sides, and has a size that can cover the entire surface of the metal filter, which is also rectangular, The release sheet is divided into an upper release sheet and a lower release sheet by forming approximately parallel slits on the upper and lower sides of the filter body, The slit is formed within a slit formation region that corresponds to 10% to 50% of the vertical length of the filter body from the upper side, the adhesive layer is composed of an upper adhesive layer formed along the upper edge of the filter body and other adhesive layers, and the upper adhesive layer has a vertical width of 20 mm to 50 mm, which is larger than the width of the other adhesive layers; a ratio of the adhesive layer in an upper region of the filter body where the upper adhesive layer is formed is greater than a ratio of the adhesive layer in a remaining region excluding the upper region from the slit forming region; The adhesive strength of the upper adhesive layer is adjusted so that even if only the upper release sheet of the release sheet is peeled off from the adhesive layer and the lower release sheet is peeled off while only the upper adhesive layer of the adhesive layer is attached to the upper edge side of the metal filter, the upper adhesive layer will not peel off from the metal filter.

2. The vertical length of the filter body is 300 mm or more and 500 mm or less, the slit formation region is in a range of 30% to 50% from the upper side of the filter body with respect to the vertical length, 2. The filter structure of claim 1, wherein the adhesive layer accounts for 80% to 100% of the upper region of the filter body where the upper adhesive layer is formed, and the adhesive layer accounts for 5% to 40% of the remaining region excluding the upper region from the slit forming region.

3. The filter structure according to claim 1 or 2, wherein the adhesive layer is formed at a position that does not overlap with the slit of the release sheet.

4. The thickness of the filter body is 0.3 mm or more and 15 mm or less, The thickness of the release sheet is 12 μm or more and 75 μm or less, The filter structure according to claim 1 or 2, wherein the maximum peel load of the adhesive layer is 0.004 N / mm or more and 0.18 N / mm or less.

5. The opening of the range hood is an upper cover that covers the upper part of the opening; An opening body with a built-in ventilation fan, The metal filter is placed over the opening body, On the edge of the opening, from top to bottom, the frame of the upper cover, the locking frame of the opening body for locking the metal filter, and the metal filter are arranged in parallel, A gap is formed between the locking frame and the metal filter, 3. The filter structure according to claim 1, wherein the width of the upper adhesive layer in the vertical direction is set to be larger than the total length of the vertical length of the locking frame and the gap length.

6. 3. The filter structure according to claim 1, further comprising an indicator made of an adhesive layer that is visible as a mark indicating when to replace the filter body after the filter body becomes dirty.

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