JP4935177B2 - Adsorbent sheet - Google Patents

Description

The present invention relates to an absorptive sheet excellent in deodorizing function, pleating processability, and performance stability.

One technique for applying an adsorbent to an air purification filter is to manufacture a sheet containing the adsorbent and then use the air to be purified by passing it in a direction perpendicular to the sheet surface. As an important characteristic required for the air purification filter used in such a method, not only the deodorizing performance is good, but also a low pressure loss is strongly demanded. As an adsorbent sheet satisfying such low pressure loss and high deodorizing performance, for example, a hot melt nonwoven fabric is used in the adsorbent layer, and a granular adsorbent such as activated carbon is applied to the entire hot melt nonwoven fabric on one side and the other side. An absorptive sheet that is bonded and fixed by heat fusion is disclosed (see, for example, Patent Document 1). However, in the adsorbent sheet, since the portion where the granular adsorbent is in contact with the hot melt nonwoven fabric is entirely covered with resin, the resin area covering the granular adsorbent is difficult to be constant, and therefore the deodorization performance is not stable. There is a problem. In addition, in air purification filter applications, it is common to apply pleating to increase the area of the filter medium in practice. However, the adsorbent sheet is formed by communicating holes formed and fixed by using hot melt nonwoven fabric. It sometimes disappears due to the external force received, and the effect of reducing the pressure loss cannot be maintained. In addition, a heat setting step is necessary to stabilize the pleat shape, but at this time, the softening or remelting of the hot melt nonwoven fabric increases the packing density of the granular adsorbent, thereby increasing the ventilation resistance. He also had problems.
JP-A-11-253720

The present inventors have been made against the background of the above-described prior art, and are intended to provide an adsorptive sheet that stabilizes deodorizing performance and ventilation resistance, and also has good pleatability and performance after processing. is there.

As a result of intensive studies to solve the above problems, the present inventors have finally completed the present invention. That is, the present invention is (1) an adsorbent sheet having an adsorbent layer made of an adsorbent and a thermoplastic resin on a substrate, the adsorbent having an average particle diameter of 400 to 800 μm, An adsorptive sheet comprising a split sheet having a basis weight of 5 to 100 g / m ² and a packing density of 0.01 to 0.35 g / cc, which is made of fibers having a melting point higher than that of the thermoplastic resin; 2) the divider sheet is spunbonded nonwoven fabric, thermal bond nonwoven fabric, spun lace nonwoven fabric alone or absorptive sheet comprising a combination thereof, (3) (1) or more breathability on the surface of the laminated unit according to (2) It is an adsorbent sheet formed by laminating and integrating sheets.

The adsorptive sheet according to the present invention has an advantage that it can provide an adsorbent sheet having stable deodorizing performance and ventilation resistance, and good pleatability and performance after processing.

Hereinafter, the present invention will be described in detail.
Adsorption sheet of the present invention comprises a base material, a suction sheet having an adsorption layer formed of the adsorbent and a thermoplastic resin, the adsorption layer consists of a high melting point of the fibers than the thermoplastic resin that having a split seat. By adopting such a structure, it is possible to reduce pressure loss regardless of before and after pleating without impairing the performance of the adsorbent. That is, in the conventional adsorbent sheet, the granular adsorbent is fixed only by the thermoplastic resin (including the hot melt nonwoven fabric), but the adsorbent sheet of the present invention also has steric hindrance of the fibers constituting the divided sheet. Utilizing this, the position of the particulate adsorbent is fixed. With this configuration, the surface of the granular adsorbent is covered with a melted thermoplastic resin to maintain the adsorption performance, and even if external force is applied during pleating at high temperatures, the fixed granular adsorbent The inventors of the present application have found that the position hardly changes and high adsorption performance and low pressure loss can be realized.

  The split sheet used for the adsorbent sheet of the present invention is preferably a nonwoven fabric produced by a spunbond method, a nonwoven fabric produced by a thermal bond method, or a nonwoven fabric produced by a spunlace method. It is preferable to use a sheet formed by these production methods, because it is easy to form a nonwoven fabric with a low basis weight, a low thickness, and a low air resistance, and there is a load such as tension and compression at normal temperature and heat load. Even if applied, it is difficult to cause changes in physical properties, deformation, and the like, and furthermore, the steric hindrance action described above can be used.

  The fibers constituting the split sheet used in the adsorbent sheet of the present invention are not particularly specified, such as polyolefin-based, rayon-based, polyester-based, polyamide-based, polyurethane-based, acrylic-based, polyvinyl alcohol-based, polycarbonate, etc., and core-sheath fibers are used. Of course, various mixed fibers may be used. Moreover, you may finish and use for the charged nonwoven fabric which can also increase the removal effect with respect to submicron particle | grains including tobacco smoke particle | grains, carbon particle | grains, and sea salt particle | grains, what is called an electret sheet | seat.

  The divided sheet used for the adsorbent sheet of the present invention preferably has a filling density of 0.35 g / cc or less. If it is 0.35 g / cc or less, even when split sheets are present when it is practically used as an air purification filter, the low pressure loss performance is not greatly impaired, and it has excellent adsorption performance and low pressure performance. This is because an air purification filter is obtained. Further, the lower limit of the packing density is not particularly problematic, but if it is less than 0.01 g / cc, the function as a divided sheet is hardly exhibited. The filling rate of the more preferable divided sheet is 0.03 to 0.30 g / cc, and more preferably 0.05 to 0.25 g / cc.

  The thickness of the divided sheet used for the adsorptive sheet of the present invention is preferably 0.50 mm or less, and more preferably within 0.30 mm. If the thickness is 0.5 mm or more, the thickness of the entire adsorbent sheet becomes too thick, and when a pleated filter unit is used, the structural resistance increases and as a result, the ventilation resistance of the entire unit increases.

  As for the fiber diameter of the fiber which comprises the split sheet of this invention, 5-100 micrometers is preferable. If the fiber diameter is 5 μm or more, the ventilation resistance of the divided sheet itself can be reduced, and the distance between the fibers in the vicinity of the surface of the divided sheet is increased more than the size of the thermoplastic powder resin. This is because airflow resistance can be suppressed because the blockage is reduced, and further, an effect of suppressing clogging can be obtained when supplying dust. Moreover, if the fiber diameter is 100 μm or less, the gap between the fibers does not become too large, and as a result, an adsorbent sheet with a stable quality in which the granular adsorbent is not dropped and dropped off is obtained. The fiber diameter is more preferably 7 to 80 μm, still more preferably 10 to 60 μm.

  When the fiber used for the adsorbent sheet of the present invention is a short fiber, the fiber having a fiber length of 10 mm or more is preferably the main fiber. This is because within such a range, sheet breakage is unlikely to occur when a load such as tension or compression is applied, and the function as a divided sheet is unlikely to be lost even during pleating.

Dividing the sheet used for the adsorption sheet of the present invention, it is preferred as the weight per unit area is 5 to 100 g / m ^2. If it is 5 g / m ² or more, it becomes difficult for sheet breakage to occur when a load such as tension or compression is applied at the time of pleating, etc., and also prevents the particulate adsorbent and thermoplastic powder resin from coming off, This is because it functions as a divided sheet. On the other hand, by setting the basis weight to 100 g / m ² or less, the ventilation resistance of the divided sheet itself can be suppressed, and the structural resistance in the case of a pleated unit can also be suppressed.

  The melting point of the fibers constituting the split sheet used in the adsorbent sheet of the present invention preferably includes fibers that are equal to or higher than the melting point of the thermoplastic powder resin mixed with the granular adsorbent. If the melting point is only fibers equal to or higher than that of the thermoplastic resin, the occurrence of sheet breakage will be reduced in the heat load process during the sheet forming process, and sheet collapse will be less likely to occur. As a result, the packing density of the granular adsorbent This is because the low ventilation resistance can be maintained. The melting point of the fibers constituting the preferable split sheet is to contain at least fibers having a melting point of 10 ° C. or higher, more preferably 20 ° C. or higher, and further preferably 25 ° C. or higher. The upper limit is not particularly problematic and may be a fiber having no melting point.

  The tensile strength (MD direction) at 25 ° C. of the divided sheet used for the adsorptive sheet of the present invention is preferably 10 N / 50 mm width or more, and the tensile strength at 80 ° C. is preferably 5 N / 50 mm width or more. In the case of continuous production, it is necessary to apply a certain amount of tension during sheet processing. If it is within the range, there will be almost no occurrence of sheet breakage, and an adsorbent sheet with excellent ventilation resistance and deodorizing performance can be obtained. It is. Moreover, although an upper limit does not become a problem in particular, if it exceeds 300 N / 50 mm width, the effect for achieving the objective of this invention will become diluted. In addition, the above-mentioned value is a value carried out with a test piece having a size width of 50 mm, a length of 200 mm, a gauge distance of 150 mm, and a tensile speed of 200 mm / min.

  The tear strength based on JISL-1906 is preferably 0.5N at 25 ° C and 0.3N or more at 100 ° C. The reason is due to the same reason described in the tensile strength.

  The type of the thermoplastic powder resin used in the adsorbent sheet of the present invention is not particularly limited, but polyolefin-based, polyamide-based, polyurethane-based, polyester-based, ethylene-acrylic copolymer, polyacrylate, polyarene, polyacrylic , Polydiene, ethylene-vinyl acetate, PVC, PS and the like.

  The average size of the thermoplastic powder resin is preferably 1 to 40 μm. More preferably, it is 5-30 micrometers. More preferably, 95% by weight or more is contained in the range of 1 to 40 μm. If it is 1 μm or more, it becomes difficult to block the surface pores of the granular adsorbent, and it becomes easy to draw out the adsorption performance of the adsorbent. On the other hand, if it is 40 μm or less, pre-adhesion to the granular adsorbent by van der Waals force or electrostatic force is strong at the time of mixing with the granular adsorbent, and the finally heat-treated adsorbent sheet has adhesiveness and good uniformity. It is because it is obtained. In addition, the finer the particles relative to the granular adsorbent, the easier it is to mix with the granular adsorbent in a dry state due to electrostatic and van der Waals forces at the time of mixing, and a more uniform characteristic sheet can be easily formed. The shape is not particularly defined, but examples thereof include a spherical shape and a crushed shape. Of course, two or more thermoplastic powder resins can be used in combination. Furthermore, even if a powder-supported granular adsorbent or a base sheet or breathable sheet loaded with chemical is used, if this formulation is used, the surface of the powder adsorbent is temporarily mixed with the thermoplastic powder resin from the dry state. Even if the chemicals have different properties because they are bonded, it is possible to avoid interfering with each other even in the subsequent sheet forming step, so that a sufficient effect is exhibited.

  The melting point of the thermoplastic powder resin is preferably 80 ° C. or higher in consideration of the environmental temperature in the room of a moving vehicle or the like. More preferably, it is 100 ° C. or higher. The upper limit is not particularly problematic, but it is preferably 200 ° C. or less from the relationship with the melting point of the divided sheet.

  The fluidity at the time of melting of the thermoplastic powder resin is preferably 1 to 80 g / 10 min in terms of the MI value described in JIS K 7210. More preferably, it is 3-30 g / 10min. When MI is less than 80 g / 10 min, the fluidity on the surface of the adsorbent becomes small, and it becomes difficult to cast the surface of the adsorbent and cover the pore surface, so that the deodorizing performance of the adsorbent can be further extracted. On the other hand, if it is larger than 1 g / 10 min, sufficient adhesive force can be obtained, and the melting energy is small, which is advantageous in terms of production cost.

  It is preferable to use the thermoplastic powder resin in an amount of 1 to 40% by weight with respect to the granular adsorbent in consideration of adhesive strength, ventilation resistance and deodorizing performance. More preferably, it is 5 to 30% by weight.

  The method for adjusting the particle size of the thermoplastic powder resin is not particularly limited, and examples thereof include mechanical pulverization, freeze pulverization, and chemical adjustment. Moreover, although it can finally obtain a fixed particle size by sieving, it is not limited to this as long as the method can ensure a fixed particle size.

  In order to make handling easier, a breathable sheet can be further laminated from both sides of the laminated unit. Since the thermoplastic powder resin adheres to the activated carbon surface of the breathable sheet, the thermoplastic powder resin can be effectively used and bonded, or a new adhesive may be added to the breathable sheet for bonding. Of course, the same sheet as the divided sheet can also be used. The electret nonwoven fabric mentioned above can also be used. In any case, it is preferable that the thickness is smaller because the folding pitch can be reduced, the adsorbent sheet area can be increased, the airflow resistance can be reduced, and the deodorizing performance can be improved.

  The average particle diameter of the adsorbent used in the adsorbent sheet of the present invention is an average of 60 to 800 μm in terms of JIS standard sieve (JIS Z8801) in consideration of air permeability, adsorbent dropout, sheet processability, etc. Is more preferable, and 100 to 600 μm is more preferable. When the average particle size is less than 60 μm, the airflow resistance becomes too large to obtain a certain high adsorption capacity, and at the same time, the sheet filling density tends to be high, which causes an early increase in airflow resistance when supplying dust. Also become. When the average particle diameter exceeds 800 μm, the initial adsorption performance in one pass becomes extremely low, and further, the pleat shape and the corrugated shape when the filter unit for wave purification is used, and the workability at the time of corrugated processing Deteriorate. In addition, said granular powder granular adsorbent can be obtained by carrying out predetermined particle size adjustment using a normal classifier.

  Examples of the granular adsorbent used in the adsorbent sheet of the present invention include powder, granule, crushed shape, granulated shape, and bead shape.

  Although the raw material of the granular adsorbent used for the adsorbent sheet of the present invention is not particularly limited, an activated carbon system that can adsorb a wide variety of gases is preferable. For example, activated carbon such as coconut shell, wood, coal, and pitch is preferably used. It is better that the number of so-called macropores introduced into the interior as seen by surface observation is large. When a mixed powder is made from activated carbon and thermoplastic powder resin, the adsorbable pores are released by gas desorption from the inside of the pores during hot pressing even if the thermoplastic powder resin covers the activated carbon surface. be able to. In addition, if the surface of the activated carbon is rough to some extent, the fluidity of the melted resin also deteriorates, and a decrease in adsorption performance can be suppressed.

  The amount of toluene adsorbed when measured in accordance with JIS K1474 of the granular adsorbent used in the adsorbent sheet of the present invention is preferably 20% by weight or more. This is because high adsorption performance is required for nonpolar gaseous and liquid substances such as malodorous gases.

The adsorbent used in the adsorbent sheet of the present invention may be used after chemical treatment for the purpose of improving the adsorption performance of polar substances and aldehydes.

Examples of chemicals used for gas chemical treatment include aldehyde gases, nitrogen compounds such as NOx, sulfur compounds such as SOx, and acidic polar substances such as acetic acid such as ethanolamine, polyethyleneimine, aniline, and P-anisidine. , Amine drugs such as sulfanilic acid, sodium hydroxide, potassium hydroxide, guanidine carbonate, guanidine phosphate, aminoguanidine sulfate, 5.5-dimethylhydantoin, benzoguanamine, 2.2-iminodiethanol, 2.2.2 Nitrotriethanol, ethanolamine hydrochloride, 2-aminoethanol, 2.2-iminodiethanol hydrochloride, P-aminobenzoic acid, sodium sulfanilate, L-arginine, methylamine hydrochloride, semicarbazide hydrochloride, hydrazine, hydroquinone , Hydroxylamine sulfate Permanganate, potassium carbonate, potassium hydrogen carbonate and the like are preferably used. For basic polar substances such as ammonia, methylamine, trimethylamine and pyridine, for example, phosphoric acid, citric acid, malic acid, ascorbine Acid, tartaric acid and the like are preferably used. The chemical treatment is performed by, for example, supporting or attaching a chemical to activated carbon. In addition to directly treating the activated carbon with chemicals, it is possible to impregnate the entire sheet or impregnate the entire sheet by a method such as an ordinary coating method in the vicinity of the sheet surface. At this time, a chemical aqueous solution in which a thickener such as sodium alginate or polyethylene oxide is mixed can be prepared, supported, and attached. This method is effective in supporting and attaching a chemical having low solubility in water and further suppressing the chemical from falling off.

  The adsorptive sheet of the present invention may be configured to include components having incidental functions such as antibacterial agents, antifungal agents, antiviral agents, and flame retardants. These components may be kneaded into fibers, non-woven fabrics, or woven fabrics, or may be attached and supported by post-processing. For example, by including a flame retardant, FMVSS. It is possible to manufacture an adsorbent sheet that meets the standards for retarding flame retardancy defined in 302 and UL flame retardant standards.

  The component having the incidental function may be attached or supported on the particulate adsorbent or the like. However, in this case, care must be taken not to impair the original adsorption function of the granular adsorbent. In addition, it is possible to enhance the deodorizing function by adding a function having adsorption performance to fibers such as a split sheet and a breathable sheet, for example, by attaching an acid or alkali chemical or using ion exchange fibers. .

  The basic manufacturing method of the adsorptive sheet will be described. First, the granular adsorbent and the thermoplastic powder resin are weighed to a predetermined weight, placed in a shaker (stirrer), and stirred at a rotational speed of 30 rpm for about 10 minutes. The moisture content at this time is preferably within 15% of the weight of the mixture. At this point, the thermoplastic powder resin is a mixture temporarily bonded to the surface of the granular adsorbent. Next, this mixed granular material is sprayed on the base material sheet, and a sheet that finally becomes the position of the divided sheet is covered, and a heat press process and a cooling process are performed. Then, after spraying the mixed granular material of the granular adsorbent and the thermoplastic powder resin on the divided sheet side of the sheet, and covering the breathable sheet, a heat press treatment and a cooling treatment are performed to obtain an adsorbent sheet. The sheet surface temperature during hot pressing is preferably about 3 to 30 ° C, preferably 5 to 20 ° C higher than the melting point of the thermoplastic powder resin.

  In addition, if pre-heated and pre-bonded with infrared rays or the like before heat treatment, mixed powder particles that tend to occur at the time of pressing will not be generated, and an adsorbent sheet with better dispersibility is produced. it can. The heat treatment using infrared rays does not cause an air current and the like, can be heated in a state where the mixed powder particles are allowed to stand, and scattering of the mixed powder particles can be prevented.

  In order to produce a sheet by finally hot pressing, a hot press method between rolls or a flat bed laminating method in which the upper and lower parts are sandwiched between flat heat belt conveyors can be used. The latter is more preferable for producing a more uniform thickness and adhesion. Further, the combination of the characteristics of the base material sheet and the manufacturing method can suppress excessive binding between the particulate adsorbents, and at the same time, can obtain a practically sufficient adhesive strength with the base material sheet.

  The granular adsorbent should be suppressed to a spraying amount such that one to three particles, preferably one to two particles, are arranged in the thickness direction on the average between the split sheet and the breathable sheet. If the average is 4 or more, the packing density between the air-permeable split sheet and the air-permeable sheet of the granular adsorbent is increased, so that not only the air resistance is increased but also the function of holding the adsorbent of the split sheet is difficult to exhibit. Therefore, the adsorbing ability of the granular adsorbent from the cross section when the adsorbent sheet is cut is increased, which is not preferable. Of course, it is also possible to laminate the gas-permeable adsorbent and thermoplastic powder resin on the above-mentioned adsorbent sheet and then heat-press the laminated air-permeable sheet. An adsorptive sheet having two or more adsorbent layers can also be produced.

  The thickness of the pleated filter unit using the filter medium of the present invention is preferably 10 to 400 mm. For in-vehicle applications such as built-in car air conditioners and home air purifiers, 40 to approximately 10 to 60 mm, a large filter unit that is often installed for building air conditioning applications, due to the normal internal space. About ~ 400 mm is preferable considering the storage space.

  The pleat peak apex distance of the filter unit of the present invention is preferably 2 to 30 mm. If it is 2 mm or less, the ridges are too close together and there is a lot of dead space, making it impossible to use the sheet efficiently. On the other hand, if it is 30 mm or more, the sheet development area becomes small, so that it is not possible to obtain the removal effect according to the filter thickness.

In the filter unit of the present invention, any surface may be used on the upstream side, but it is preferable to use a bulky sheet surface upstream because the dust holding amount is increased.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the following examples are not intended to limit the present invention, and any design changes in accordance with the gist of the preceding and following descriptions are all within the technical scope of the present invention. Is included.

  In addition, the numerical value in an Example is the value measured by the following methods.

(1) Thickness: Value when a pressure of 7 gf / cm ² is applied

(2) Ventilation resistance: Value under a linear speed of 30 cm / s. Measurement was performed on a sample cut to 70φ.

(3) Deodorization performance: Using toluene gas, the upstream and downstream concentrations of the filter were measured with a gas-tech detector tube at a linear speed of 16 cm / s, and the downstream gas concentration was subtracted from the upstream gas concentration. It was expressed as a percentage of the value divided by the upstream gas concentration. The measurement was carried out on a sample cut to 6 cm x 6 cm. In this patent, the upstream concentration was 80 ppm, and the removal rate data one minute after the start of measurement was described in the examples.

Hereinafter, the embodiment will be described in detail.
Sheet A: Spunbond non-woven fabric having a core-sheath structure of PET (core) / PE (sheath) (Product name: S0203, Unitika Elves, 20 g / m ² basis weight, thickness 0.11 mm, ventilation resistance 5 Pa, sheath part melting point 130 ° C. , Core melting point 260 ° C.)

Sheet B: Spunbond non-woven fabric having a core-sheath structure of PET (core) / PE (sheath) (Product name: T0123, Unitika Elves, basis weight 12 g / m ² , thickness 0.09 mm, ventilation resistance 0.6 Pa, sheath part melting point (130 ° C, core melting point 260 ° C)

Sheet C: Polyester fiber (sheath part melting point 150 ° C., core part melting point 260 ° C.) 4.4 dte × 51 mm 15% by weight, 22 dtex × 51 mm (sheath part melting point 190 ° C., core part melting point 260 ° C.) 70% by weight, and non-core Sheath fiber 17 dtex × 51 mm (melting point 260 ° C.) 15% by weight of fiber was mixed with a card and then converted into a web, followed by hot pressing to fabricate a nonwoven fabric with a basis weight of 60 g / m ² , a thickness of 0.3 mm, and a ventilation resistance of 4 Pa. It was produced by the bond method.

Sheet D: Hot melt nonwoven fabric made of polyamide resin (Product name: LNS3020, manufactured by Kureha Tech Co., Ltd., basis weight 20 g / m ² , thickness 0.15 mm, ventilation resistance 1 Pa, melting point 85 ° C.)

Sheet E: Rayon fiber 1.7 dtex × 51 mm 50% by weight, polyester fiber 1.6 dtex × 51 mm 30% by weight, polyester fiber (sheath part melting point 130 ° C., core part melting point 260 ° C.) 2.2 dte × 51 mm, 20% by weight A spunlace nonwoven fabric having a basis weight of 25 g / m ² , a thickness of 0.25 mm, and a ventilation resistance of 5 Pa was produced by mixing with a card and then forming a web, and then performing sheeting by a hydroentanglement method.

Example 1 Sumitomo Seika made 1 kg of coconut shell granular activated carbon having an average particle diameter of 400 μm, a bulk density of 0.4 g / cc, and a toluene adsorption capacity of 35% by weight measured by the JIS K 1474 method as a thermoplastic powder resin. 0.1 kg by weight of flow beads EA209 (ethylene-acrylic acid copolymer, average particle size 10 μm, MI 9 g / 10 min, melting point 105 ° C.) was weighed and mixed for about 10 minutes. The mixed powder is spread on the sheet A so as to be 110 g / m ² , and the sheet B is overlapped between the Teflon (registered trademark) / glass belts from above. An adhesive sheet was obtained by performing hot pressing at 120 ° C. for 30 seconds at a pressure of 3 mm and a pressure of 10 N / cm ² (first layer). Further, a similar mixed granular material is spread at 110 g / m ² on the sheet B side of the adsorbent sheet. Further, the sheet B is overlapped from above and sandwiched between Teflon (registered trademark) / glass belts. A laminated adsorbent sheet was obtained by performing hot pressing at 120 ° C. for 30 seconds at 0.8 mm and a pressure of 10 N / cm ² .

  (Example 2) A laminated adsorbent sheet was obtained in the same manner as in Example 1 except that the sheet C was used as a sheet to be superposed from the top when the first adsorbent sheet was produced.

  (Comparative Example 1) A laminated adsorptive sheet was obtained in the same manner as in Example 1 except that the sheet D was used as the sheet to be superposed from above when the first adsorbent sheet was produced.

  (Example 3) A laminated adsorptive sheet was obtained in the same manner as in Example 1 except that the sheet E was used as a sheet to be superposed from the top when the first adsorbent sheet was produced.

Moreover, in order to confirm the effect in the shape which was actually made into the filter unit, the absorptive sheet described in Examples and Comparative Examples was subjected to pleating processing, the filter thickness was 30 mm, the pleat peak spacing was 6 mm, and the front size was 200 mm × 200 mm. The ventilation resistance in the unit state was measured. In order to firmly attach the creases, it is necessary to perform heat setting after the pleating process, but the upper and lower hot plate temperature of the heat set was set to 100 ° C.
Table 1 summarizes the main data.

  As described above, the adsorptive sheet of the present invention has an advantage that it can provide an adsorbent sheet that is excellent in deodorizing performance and pleatability, and also has good performance after processing, and contributes to the industry. is there.

It is a schematic diagram of the adsorptive sheet of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Adsorbent sheet 2 Base material sheet 3 Dividing sheet 4 Breathable sheet 5 Powdered adsorbent

Claims (3)

On a base material, a suction sheet having an adsorption layer formed of the adsorbent and a thermoplastic resin, wherein an adsorbent is an average particle diameter 400～800Myuemu, the adsorption layer, higher than the thermoplastic resin melting point An adsorptive sheet having a divided sheet having a basis weight of 5 to 100 g / m ² and a filling density of 0.01 to 0.35 g / cc . The adsorptive sheet according to claim 1, wherein the divided sheet is made of a spunbond nonwoven fabric, a thermal bond nonwoven fabric, a spunlace nonwoven fabric alone, or a combination thereof . An adsorptive sheet obtained by further laminating and integrating a breathable sheet on the surface of the laminate unit according to claim 1 or 2.