JP5232256B2 - Evaporation sheet for drain drainage - Google Patents

Description

  The present invention relates to an evaporating sheet disposed in a tray of a drain drainage device installed in a refrigeration apparatus, a large refrigerator, or the like, and relates to a felt evaporating sheet in which the water absorption capacity is hardly lowered even when used for a long period of time.

  Refrigeration equipment, large refrigerators, indoor air conditioners, and large humidifiers are equipped with a tray that holds drainage drainage containing condensed water and slow frost water generated in large quantities during operation, and drainage drainage is automatically removed from the tray. Therefore, it must be evaporated efficiently. In JP-A-2004-53049, as a drain drainage device, a drain drainage device in which a large number of evaporation plates are vertically arranged at regular intervals in a drain tray such as an existing refrigeration device or a large refrigerator is disposed. Each evaporating plate is immersed in the drainage in the drain pan and effectively evaporates the drainage from each evaporating plate. In this drainage drainage device, all the evaporation plates are all made of paper or synthetic fiber (paragraph 0002), and an upper cut groove and a lower cut groove are formed on both lateral sides of each evaporation plate. The reinforcing support plates are inserted horizontally into the lower cut grooves, and the respective evaporation plates are stably supported in a vertical state.

  Refrigeration equipment and large refrigerators equipped with this drainage drainage device have different ventilation and drainage drainage amounts depending on the specifications and usage, so the deformation resistance when wet and dry required for each evaporation plate is different. To do. In JP 2004-53049 A, a rectangular annular steel wire frame is inserted into a parallel side surface of the evaporation plate together with a linear reinforcing support plate in order to keep the deformation strength of the evaporation plate high, or a wide rectangular annular reinforcement frame is used. The body is inserted directly into the parallel side of the evaporation plate. As a result, even if the evaporating plate is made of water-absorbing paper, the deformation resistance of the evaporating plate can be slightly increased by attaching a reinforcing member such as a steel wire frame, but the water absorption over time decreases. Cannot be avoided.

  On the other hand, rayon fibers are known as fibers having high water absorption performance, and there are various felt materials using rayon fibers. For example, JP-A-2005-37076 proposes a vaporization filter that is compact and has high vaporization performance using a nonwoven fabric obtained from rayon fibers and heat-fusible fibers. Utility model registration No. 3142589 filed by the present applicant proposes a waste ink absorber for felt ink jet printers, which includes rayon fiber, polynosic fiber, cupra fiber, acetate fiber, cross-linking Carboxymethylcellulose fibers and the like can be used (see paragraph 0013).

JP 2004-53049 A JP 2005-37076 A Utility Model Registration No. 3142589 Specification

  In the drain drainage device, as long as the parallel evaporation plates are made of water-absorbing paper, there is a limit to increasing the deformation resistance of the evaporation plate, no matter what kind of reinforcing member is attached. The decline cannot be improved. Japanese Patent Application Laid-Open No. 2004-53049 discloses that the evaporation plate is made of paper or synthetic fiber, and it can be estimated that the evaporation plate made of synthetic fiber means a relatively thin wet nonwoven fabric. If a wet nonwoven fabric is used as the evaporation plate, polyester, nylon, vinylon, viscose, sufu, etc. are added to the raw material fiber of the nonwoven fabric alone or in combination depending on the purpose.

  If the evaporation plate is made of a wet nonwoven fabric, it can be easily predicted that the rayon fiber is mixed in order to improve the water absorption performance. However, since rayon fiber has lower strength, wet modulus, water resistance, and alkali resistance than cotton, it has been difficult to apply it to a wet nonwoven fabric for an evaporation plate. On the other hand, Japanese Patent Application Laid-Open No. 2005-37076 discloses a vaporization filter even when a rayon fiber is mixed with a heat-fusible fiber and then molded, and a corrugated non-woven fabric is integrally heat-sealed with a flat non-woven fabric. It only has deformation resistance to the extent that it can be applied, and if it is used vertically in water like an evaporation plate, it will buckle and deform instantly.

  The present invention has been proposed in order to improve the above-mentioned problems associated with the conventional evaporation plate used in the drainage device, and has a high deformation resistance. An object of the present invention is to provide an evaporating sheet that can be maintained for a long time and can retain high water absorption performance for a long time. Another object of the present invention is to provide an evaporating sheet that does not expand or fall even when the environmental temperature is close to 140 ° C.

  The evaporating sheet according to the present invention is for a drainage device, and is used in a state that a large number of sheets are juxtaposed vertically in a tray. The evaporating sheet of the present invention comprises a felt containing 25 to 70% by weight of water-absorbing fibers, 25 to 45% by weight of heat-fusible fibers, and 0 to 35% by weight of heat-resistant fibers. The whole is integrated, heat treated, and then formed into a thin sheet by hot pressing.

  Preferably, the evaporation sheet of the present invention comprises a felt containing 55 to 70% by weight of water-absorbing fibers and 30 to 45% by weight of heat-fusible fibers if no heat-resistant fibers are added. Moreover, you may consist of the felt containing 25-60 weight% of water absorbing fibers, 25-45 weight% of heat-fusible fibers, and 10-35 weight% of heat resistant fibers.

  In the evaporating sheet according to the present invention, it is preferable that the water absorbing fibers are rayon fibers and the heat resistant fibers are hydrophilic or antibacterial polyester fibers. It is preferable that the evaporating sheet of the present invention is only a hot press which is subjected to resin processing before hot pressing or not subjected to resin processing, as desired. In this resin processing, the agent added to the acrylic resin may be a fungicide, an antibacterial agent, a surfactant, or a mixture thereof.

  The evaporating sheet according to the present invention has high deformation resistance even when it contains a large amount of water-absorbing fibers, and does not swell or buckle when standing vertically in water, and stabilizes the vertical state for a long time. Can be maintained. Moreover, the evaporating sheet of the present invention has a high water absorption performance by containing a large amount of water-absorbing fibers such as rayon fibers, and the water absorption performance is less likely to deteriorate even when used for a long time. It is economical because the number of replacements can be reduced and the maintenance period of the drainage device can be set longer.

  Even if the evaporating sheet according to the present invention is in a dry state or a wet state, the evaporating sheet can exhibit a certain water absorption performance when immersed in water immediately after that, and expands even if the sheet is immersed in water after drying. It does not happen to fall or fall. Therefore, the evaporating sheet of the present invention can be sufficiently used even in a severe environment in a large commercial facility, and is actually suitable as a drainage drainage device disposed in a commercial facility refrigeration apparatus, a large refrigerator, an indoor air conditioner, and a large humidifier. is there.

It is an expanded sectional view which illustrates the evaporation sheet concerning the present invention. FIG. 2 is a perspective view showing a state in which a large number of evaporating sheets of FIG. It is a perspective view which shows the state arrange | positioned in a saucer in a drain drainage device. It is a graph which shows the result of an initial water absorption and a water absorption cycle test. It is a graph which shows the result of the water absorption evaluation after a heat test.

  The evaporating sheet 1 according to the present invention is preferably made of a felt containing at least the water-absorbing fibers 2 and the heat-fusible fibers 3, and it is preferable to add heat-resistant fibers as desired. Therefore, the evaporation sheet 1 is made of a felt containing 25 to 70% by weight of water-absorbing fibers, 25 to 45% by weight of heat-fusible fibers, and 0 to 35% by weight of heat-resistant fibers. The felt may be integrated by carding and needle punching, and may be treated with a water jet punch instead of or in addition to the needle punching.

  For example, as shown in FIG. 1, the evaporating sheet 1 is made of felt containing water-absorbing fibers 2, heat-fusible fibers 3, and heat-resistant fibers 4. The felt is heat-treated, and further pressed or resin processed. I do. As shown in FIG. 2, the evaporating sheet 1 constitutes a drainage drainage device 5 (see FIG. 3) by arranging a plurality of sheets vertically arranged at regular intervals and arranging the device in a drain pan 6. To do.

  In the present invention, the water-absorbing fiber 2 usually means a highly hydrophilic fiber having an official moisture content of 10% or more, and includes natural or synthetic fibers whose hydrophilicity has been improved by modification. Examples of the water-absorbing fibers 2 include rayon fibers, polynosic fibers, cupra fibers, hemp, silk, wool, crosslinked polyacrylate fibers, crosslinked carboxymethyl cellulose fibers, and mixed cotton fibers thereof. In particular, rayon fibers are preferable in terms of high hydrophilicity and cost, although they have low tensile strength particularly when wet. The hydrophilic polyester fiber generally has the same water absorption as that of cotton having an official moisture content of 8.5%, but if the official moisture content is less than 10%, it is not included in the water absorbent fiber 2 in the present invention. .

  When the heat-absorbing fiber 4 is not added, the water-absorbing fiber 2 is preferably added in an amount of 55 to 70% by weight, particularly 60 to 70% by weight based on the total fiber amount. Further, when the heat-resistant fiber 4 is added to the water-absorbing fiber 2, 25 to 60% by weight of the total fiber amount is added, and 30 to 40% by weight is particularly preferable. At this time, when the water absorbent fiber 2 is less than 25% by weight, the evaporating sheet 1 cannot be provided with a predetermined water absorbing performance. On the other hand, if the water absorbent fiber 2 exceeds 60% by weight, the deformation resistance strength of the evaporating sheet 1 is lowered and the durability is lowered.

  The water-absorbent fiber 2 may be further improved in hydrophilicity by raw yarn modification, hydrophilic processing or post-processing modification. For example, as rayon fibers, fibers that have been given antibacterial and deodorizing properties by adding wet spinning such as chitin or chitosan (trade name: manufactured by Clavion, Ohmikenshi), etc., or wood pulp such as eucalyptus is used as a raw material Lentin Grayon, Lyocell (trademark) and Tencel (trademark) may be used, and these are added with an amine oxide solvent during wet spinning, and are much stronger than ordinary rayon, especially Less shrinkage and reduced strength when wet.

  In the present invention, the heat-fusible fiber 3 usually means a fiber that is melted and fused at least partially during heat treatment at around 140 ° C., and usually has a melting point of 110 ° C. or less. Examples of the heat-fusible fiber 3 include polyethylene fiber, polypropylene fiber, low-melting point polyester fiber, low-melting point polyamide, or a mixed cotton fiber thereof, and a copolymer with ethylene or butene can also be used. The heat-fusible fiber 3 may be a known fiber or resin filament having a melting point of 90 to 170 ° C., or a composite fiber having a parallel or core-sheath structure, as long as the melting point is lower than that of the water-absorbing fiber.

  When the heat-resistant fiber 4 is not added to the heat-fusible fiber 3, 30 to 45% by weight of the total fiber amount is added, and particularly preferably 30 to 40% by weight is added. In addition, when the heat-resistant fiber 4 is added to the heat-fusible fiber 3, it is preferable to add 25 to 45% by weight, particularly 30 to 40% by weight of the total fiber amount. If the heat-fusible fiber 3 is less than 25% by weight, the deformation resistance of the evaporating sheet 1 does not increase, and the evaporating sheet 1 may swell or buckle if it is continuously immersed in water. On the other hand, if the heat-fusible fiber 3 exceeds 50% by weight, the evaporating sheet 1 becomes too hard and the water absorption performance of the sheet is lowered.

  In the present invention, the heat-resistant fiber 4 is added as desired. The heat-resistant fiber 4 does not normally melt during heat treatment reaching about 180 ° C., and has a tensile strength of about 4 g / D or more at the standard time and when wet. It means a certain fiber, and in terms of this tensile strength, rayon fiber, polynosic fiber, cupra fiber, silk, and wool are not included in the heat resistant fiber in the present invention. As heat-resistant fiber 4, polyester fiber, vinylon fiber, nylon 66 fiber, aromatic polyamide fiber, fluorine-based fiber, PPS fiber, polyether ether ketone fiber, heterocyclic fiber, poly-p-benzamide fiber, polyimide fiber or these Examples thereof include mixed cotton fibers. In particular, polyester fiber is suitable from the viewpoint of physical properties and cost because of its durability.

  When the heat-resistant fiber 4 is added, it is preferable to add 10 to 35% by weight of the total fiber amount, and it is particularly preferable to add 20 to 30% by weight. When the heat resistant fiber 4 is less than 10% by weight, the effect of adding the heat resistant fiber 4 is small, and it becomes difficult to increase the deformation resistance of the evaporating sheet 1. When the addition amount of the heat resistant fiber 4 exceeds 30% by weight, it is preferable to use a hydrophilic fiber such as a hydrophilic polyester fiber. On the other hand, when the heat resistant fiber 4 exceeds 35% by weight, it is difficult to impart a predetermined water absorption performance to the evaporating sheet 1 even if it is a hydrophilic fiber.

  The polyester fiber, which is the heat-resistant fiber 4, is made hydrophilic by, for example, mixing chitin or chitosan into the raw yarn to make it antibacterial, or modifying the raw yarn or post-processing to increase the fiber surface area and increase capillary action. May be increased. In this hydrophilic processing, there is a method in which colloidal silica is dispersed in a polymer at the time of polyester polymerization, and fine irregularities are formed on the fiber surface by alkali reduction after fiber formation. In addition, a fine pore forming agent may be interposed in the polyester fiber, and the continuous fine pores may be formed by alkali weight reduction treatment.

The raw fiber that is the water-absorbing fiber 2 and the heat-fusible fiber 3 is carded by adding the heat-resistant fiber 4 as desired, and the fabric weight is about 200 to 600 g / m ² . After carding, the whole is integrated by needle punching, and further heat treated in an oven at 140-180 ° C. By this heat treatment, the heat-fusible fiber 3 is melted in whole or in part to promote the entire felt. About the obtained sheet | seat raw material, the thickness after heat processing is 2-4 mm, The basis weight is about 250-650 g / m < ² >, Comprising: It is almost the same as the fabric basis weight, or raises a little.

The heat-treated sheet material may be formed into a thin sheet by hot pressing alone to obtain the evaporating sheet 1, or may be further subjected to resin processing before hot pressing, or may be subjected to resin processing after hot pressing. . The hot press at this time is indispensable, and thinning is promoted by a flat plate press at 140 to 180 ° C., and the thickness and basis weight are appropriately adjusted. With the heated flat plate press, the thickness of the sheet material becomes 1.0 to 1.5 mm, and the basis weight after hot pressing is about 250 to 650 g / m ^2, which is almost the same as the basis weight of the dough.

The resin processing improves the water resistance when the evaporating sheet 1 is immersed in water for a long period of time. The impregnating resin at this time is 20 to 100 g / m ² and is dried after impregnating the resin. The resin used for the resin processing is an acrylic resin, a melamine resin, a urea resin, or the like, and a chemical that can be added to the resin is a fungicide, an antibacterial agent, or both. The resin processing method is not particularly limited, and a coating method such as a roll coater method, a screen printing method, a spray method, a pad mangle method, or the like may be selected.

  As shown in FIG. 2, the evaporation sheet 1 is manufactured by cutting the obtained sheet material into a rectangular shape. The evaporation sheet 1 is determined to have a planar shape of about A6 to B4 according to the size of the drainage device 5. The evaporating sheets 1 are arranged in a vertical arrangement with a plurality of reinforcing plates 7 (FIG. 2) vertically at a constant interval, and the two evaporating sheets are spaced 5-6 mm apart. In actuality, about 30 to 40 evaporative sheets 1 (20 in FIG. 3) are juxtaposed to constitute a drain drainage device 5, and this device is a drain tray 6 such as a refrigeration apparatus or a large refrigerator (see FIG. 3). Place in.

  Next, the present invention will be described based on examples, but the present invention is not limited to the examples. Low-melting-point polyester fiber (trade name: 9611) having a core-sheath structure having a fineness of 4d and having a fineness of 4d, which is a heat-fusible fiber 3, and 40% by weight of rayon fiber (trade name: Clavion, manufactured by Ohmicenshi) which is a water-absorbing fiber A card wrap is formed from 30% by weight of Toray Co., Ltd. and 30% by weight of hydrophilic polyester fiber (trade name: K047, manufactured by Toray), which is heat resistant fiber 4.

The entire card wrap is integrated by a needle punch. After needle punching, heat treatment was performed in an oven at about 180 ° C., and resin processing with an acrylic resin gave a thickness of 2.1 mm and a basis weight of 520 g / m ² . When the obtained sheet material was heated and pressed with a flat plate press at 140 ° C. for 1 minute, the thickness was 1.0 mm and the basis weight was 522 g / m ² .

  60% by weight of rayon fiber (trade name: Clavion) having a fineness of 1.5d, which is water-absorbing fiber 2, and 40% by weight of low melting point polyester fiber (trade name: 9611) having a core-sheath structure of 4d, which is heat-fusible fiber 3. A card wrap is formed from%.

The entire card wrap is integrated by a needle punch. After the needle punch, when heat-treated in an oven at about 180 ° C. and treated with an acrylic resin, the thickness was 1.9 mm and the basis weight was 432 g / m ² . When the obtained sheet material was heated and pressed with a flat plate press at 140 ° C. for 1 minute, the thickness was 1.0 mm and the basis weight was 447 g / m ² .

Test example The evaporative sheet defines the initial water absorption in the product specification. Actually, since the drainage device is used for a long period of time, it is necessary for the evaporating sheet to maintain its water absorption performance. From this viewpoint, the following tests are conducted.

1. Initial Water Absorption and Water Absorption Cycle Test 250 ml of water was put into a 500 ml beaker, and the evaporation sheet 1 obtained in Examples 1 and 2 was vertically placed for 10 minutes to observe the height of water sucked up. The result is shown in the graph of FIG. Since this test also serves as a test for the decrease in water absorption, the same sample was tested 22 times. Actually, it was scheduled to be 30 times, but since no decrease in water absorption was seen, it was beaten by 22 times.

  From these results, the evaporating sheets 1 obtained in Examples 1 and 2 each had a wicking height of 140 mm or more, which is a specified value. Further, in 21 days after use, the water absorption is not lowered at all, so that it can be used for a long time.

2. Evaporation performance test Each of the evaporation sheet 1 and the existing product obtained in Examples 1 and 2 was immersed in water for 10 minutes, and then each sheet was suspended and the weight per hour was measured until it was dried. The existing product for comparison is a hard porous body (trade name: Universex) of polyester fibers having continuous pores with a porosity of 50% by volume or more, and the thickness and planar shape thereof are almost the same as those of the evaporating sheet 1.

  The existing product is in a dry state slightly earlier than the evaporating sheet 1, but is in a dry state early because the initial water absorption is low. As a result, the evaporating sheets 1 obtained in Examples 1 and 2 have substantially the same evaporating performance as existing products.

3. Water absorption performance test under adverse conditions Regarding the evaporative sheet 1 obtained in Examples 1 and 2 and the above existing products, water absorption performance was obtained in the same manner as in the initial water absorption test described above for sewage mixed with mud, dust and oil. Was measured. As a result, the evaporation sheets 1 obtained in Examples 1 and 2 have slightly better initial water absorption performance than existing products. Further, the suction height was 170 mm or more in a 20 ° C. test environment and 155 mm or more in a 50 ° C. test environment although the standard value was 140 mm or more.

4). Water absorption evaluation test after heat resistance test Regarding the evaporating sheet 1 obtained in Examples 1 and 2 and the above-mentioned existing product, the dried one and the one immersed in water for 10 minutes are left in an oven set at 200 ° C. for 2 hours. Then, water absorption evaluation on each sheet was performed several cycles. The results are shown in the graph of FIG.

  Although the evaporation sheets 1 obtained in Examples 1 and 2 were discolored, the water absorption performance itself was not different from that before the heat treatment. On the other hand, the existing product did not change its color, but its shape could not be maintained due to the expansion of the thickness. As can be seen from the graph of FIG. 5, the evaporating sheets 1 obtained in Examples 1 and 2 are far superior in water absorption performance.

5. Performance change test after 12-day continuous heat test The evaporating sheet 1 obtained in Examples 1 and 2 was left standing in an oven set at 140 ° C. for 12 days, and then the shape of the sample and water absorption performance Was measured. This measurement test is close to the state of using the actual machine for 3 years.

As a result, the evaporative sheet 1 did not fall down, although discoloration was observed, and the water absorption performance was 160 mm on the first day, 142 mm on the second day, and 144 mm on the third day. The water absorption performance of the evaporating sheet 1 is not less than the standard value of 140 mm, and there is no problem with the water absorption performance.

The fiber composition of the felt is the same as in Example 1, and a card wrap having a thickness of 3.1 mm and a basis weight of 357 g / m ² is formed by carding.

When this card wrap is heat-treated after needle punching with a needle number 36NK, the thickness is 3.25 mm and the basis weight is 364 g / m ² , and then the weight per unit area is 430 g / m when resin is processed by adding 2% of antibacterial / antifungal agent. ² . Finally, when the obtained sheet material was heated and pressed with a flat plate press, the thickness became 1.1 mm.

  The obtained evaporation sheet has the same heat resistance and water absorption performance as in Example 1.

The fiber composition of the felt is the same as in Example 1, and a card wrap having a thickness of 2.2 mm and a basis weight of 443 g / m ² is formed by carding.

This card wrap has a thickness of 2.5 mm and a basis weight of 451 g / m ² when heat-treated after needle punching, and then added 20% acrylic resin (trade name: XA5395) and 2% antibacterial / antifungal agent. When the resin was processed, the thickness was 2.2 mm, and the basis weight was 479 g / m ² . . Finally, when the obtained sheet material was heated and pressed with a flat plate press, the thickness was 1.2 mm and the basis weight was 488 g / m ² .

  The obtained evaporation sheet has the same heat resistance and water absorption performance as in Example 1.

30% by weight of rayon fiber (trade name: Clavion) with a fineness of 1.5d, 40% by weight of low-melting polyester (trade name: 9611) with a fineness of 4d, and antibacterial polyester fiber (trade name of 6d) which is a heat-resistant fiber : Bactericular PET) A card wrap having a thickness of 2.5 mm and a basis weight of 429 g / m ² is formed from 30% by weight.

When this card wrap is heat-treated after the needle punch, the thickness is 2.7 mm and the basis weight is 428 g / m ^2. Then, when heated and pressed with a flat plate press, the thickness is 1.3 mm and the basis weight is 409 g / m ² . became. Finally, when the obtained sheet material was processed with an acrylic resin, the thickness was 2.2 mm and the basis weight was 425 g / m ² .

  The obtained evaporation sheet has the same heat resistance and water absorption performance as in Example 1.

40% by weight of rayon fiber (trade name: Clavion) with a fineness of 1.5d, 40% by weight of low melting point polyester fiber (trade name: 9611) with a fineness of 4d, and 20% by weight of antibacterial polyester fiber (trade name: bactekiller) From this, a card wrap having a thickness of 2.2 mm and a basis weight of 403 g / m ² is formed.

When this card wrap is heat-treated after the needle punch, the thickness is 2.5 mm and the basis weight is 407 g / m ² , and then the resin is processed with resin (trade name: Plex OT-P), the thickness is 2.2 mm and the basis weight is It was 465 g / m ² . Finally, when the obtained sheet material was heated and pressed with a flat plate press, the thickness became 1.3 mm.

  The obtained evaporation sheet has the same heat resistance and water absorption performance as in Example 1.

40% by weight of rayon fiber (trade name: Clavion) having a fineness of 1.5d, 20% by weight of low melting point polyester fiber (trade name: 9611) having a fineness of 4d, and 20% by weight of low melting point polyester fiber (trade name: 9611) of fineness 2d A card wrap having a thickness of 2.3 mm and a basis weight of 431 g / m ² is formed from 20% by weight and 20% by weight of antibacterial polyester fiber (trade name: bactekiller).

When this card wrap was heat-treated after the needle punch, the thickness was 2.5 mm and the basis weight was 435 g / m ² , and when the resin wrap was processed with an acrylic resin, the thickness was 2.1 mm and the basis weight was 436 g / m ² . Finally, when the obtained sheet material was heated and pressed with a flat plate press, the thickness was 1.1 mm and the basis weight was 424 g / m ² .

  The obtained evaporation sheet has the same heat resistance and water absorption performance as in Example 1.

  60% by weight of rayon fiber (manufactured by Lenzing) having a fineness of 1.5d as water-absorbing fiber 2, 30% by weight of low melting point polyester fiber (trade name: 9611) having a fineness of 4d, and hydrophilic polyester fiber (trade name: K047) 10 A card wrap is formed from the weight percent. This card wrap was heat-treated after the needle punch, and then subjected to resin processing with an acrylic resin. Finally, the sheet material was heated and pressurized with a flat plate press to obtain an evaporation sheet.

  The obtained evaporation sheet has the same heat resistance and water absorption performance as in Example 1.

The felt fiber composition is the same as in Example 2, and a card wrap having a thickness of 2.8 mm and a basis weight of 370 g / m ² is formed by carding.

When the card wrap was heat-treated after the needle punch, the thickness was 3.3 mm and the basis weight was 383 g / m ² . Finally, when the obtained sheet material was heated and pressed with a flat plate press, the thickness was 1.2 mm and the basis weight was 409 g / m ² .

  The obtained evaporating sheet has the same high water absorption performance as in Example 2.

30% by weight of rayon fiber (made by Lenzing) with a fineness of 1.5d, 40% by weight of rayon fiber (trade name: Clavion) with a fineness of 1.5d, and 30% by weight of low melting point polyester fiber (product name: 9611) with a fineness of 4d Then, a card wrap having a thickness of 2.95 mm and a basis weight of 357 g / m ² is formed.

When this card wrap was heat-treated after the needle punch, the thickness was 2.85 mm and the basis weight was 363 g / m ² . Finally, when the obtained sheet material was heated and pressed with a flat plate press, the thickness was 1.2 mm and the basis weight was 359 g / m ² .

  The obtained evaporating sheet has the same high water absorption performance as in Example 2.

From 30% by weight of rayon fiber having a fineness of 3d (made by Ohmichi), 40% by weight of rayon fiber having a fineness of 1.5d (trade name: Clavion), and 30% by weight of low melting point polyester fiber having a fineness of 4d (trade name: 9611) A card wrap having a thickness of 2.95 mm and a basis weight of 365 g / m ² is formed.

When this card wrap was heat-treated after the needle punch, the thickness was 3.2 mm and the basis weight was 374 g / m ² . Finally, when the obtained sheet material was heated and pressed with a flat plate press, the thickness was 1.2 mm and the basis weight was 367 g / m ² .

  The obtained evaporating sheet has the same high water absorption performance as in Example 2.

DESCRIPTION OF SYMBOLS 1 Evaporation sheet 2 Water absorbing fiber 3 Heat-sealable fiber 4 Heat resistant fiber 5 Drain drainage device 6 Drain tray

Claims (6)

An evaporating sheet that is vertically installed in a tray and used in parallel, and is a rayon fiber, polynosic fiber, cupra fiber, hemp, silk, wool, or a mixed cotton fiber of these water-absorbing fibers 25-70 and weight%, heat fusible fibers 25 to 45 wt%, consists felt containing a 0 to 35% by weight heat resistant fibers, integrated whole by carding and needle punching, or all heat fusible fibers After heat treatment to partially melt, it is molded into a thin sheet by hot pressing at 140 to 180 ° C., and the basis weight after hot pressing is 250 to 650 g / m ² , and when it stands vertically in water, it swells or buckles. Evaporation sheet for drain drainage device that maintains its vertical state stably . 2. The evaporative sheet according to claim 1, comprising a felt containing 55 to 70% by weight of the water-absorbing fibers and 30 to 45% by weight of heat-fusible fibers. The evaporating sheet according to claim 1, comprising a felt containing 25 to 60% by weight of the water-absorbing fibers, 25 to 45% by weight of heat-fusible fibers, and 10 to 35% by weight of heat-resistant fibers. The evaporative sheet according to claim 1, wherein the water-absorbing fibers are rayon fibers, and the heat-resistant fibers are hydrophilic or antibacterial polyester fibers. The sheet material after the heat treatment, subjected to resin finishing in front of the hot pressing or evaporation sheet according to claim 1, wherein performing only the heat pressing is not subjected to the resin treatment. The evaporating sheet according to claim 5, wherein a chemical added to the acrylic resin in the resin processing is a fungicide, an antibacterial agent, a surfactant, or a mixture thereof.

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