JP2013136044A - Method of manufacturing filter molded body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a curved filter molded body having excellent filtration performance at inexpensive manufacturing cost.SOLUTION: A mixed material obtained by mixing and stirring a solid polymer as a binder and a purification component is heated and pressurized within a mold having a linear cavity and then is cooled and solidified, so as to obtain a linear primary molded body first. The obtained primary molded body is heated again and softened and then is nipped between bending molds to curve the primary molded body in the longitudinal direction. Then the curved primary molded body is cooled and hardened, so as to obtain the curved filter molded body. Thus, this method eliminates the necessity of an expensive mold with a curved cavity. By uniformly pressurizing the mixed material within the mold with the linear cavity, the curved filter molded body having excellent filtration performance can be manufactured at inexpensive manufacturing cost.

Description

  The present invention relates to a method for producing a filter molded body used for water treatment of clean water, middle water, sewage and the like.

  For example, in general households, filter molded bodies used in water purifiers that are directly attached to a water faucet or connected to the faucet and placed on a water purifier include a solid polymer serving as a binder with a purification component such as powdered or granular activated carbon. Some are manufactured by mixing and stirring, mixing and stirring the mixed raw material into a mold, heating and pressurizing to form a predetermined shape, then solidifying by cooling and releasing (for example, , See Patent Document 1). In the one described in Patent Document 1, a polymer having a high molecular weight and a low melt index is used as a binder.

  The filter molded body manufactured by the above-described manufacturing method has a uniform porous structure, and can uniformly disperse purification components such as activated carbon, and efficiently pass the water to be treated throughout the entire area to efficiently contact the purification components. And having an excellent filtration performance capable of effectively removing chlorine and organic substances in the water while ensuring a sufficient water treatment flow rate. This type of filter molded body is used in a water purifier with its outer surface covered with a sheet-like covering member such as a nonwoven fabric, and relatively large foreign matters such as dust are primarily filtered with this covering member.

JP 2001-187305 A

  In recent years, the design of faucets for household use has been diversified, and not only straight-shaped faucets but also curved-shaped faucets can be seen.

  The filter molded body produced by the method described in Patent Document 1 has excellent filtration performance. For example, when used in a water purifier of the type inserted into the curved faucet described above, the filter molded body is elongated. It is necessary to have a curved shape curved in the direction.

  However, if such a curved filter molded body is to be manufactured by the method described in Patent Document 1, the structure of a mold having a curved cavity for filling and heating and pressurizing the mixed raw material becomes complicated, The mold cost is high and the occupation time of the mold during heating and pressurization is long (about 1.5 hours). Therefore, many expensive molds are required for mass production of filter molded bodies, and the production cost is high. There is a problem. In addition, the mold with curved cavities tends to vary in how pressure is applied at each part, and the distribution of pores in the porous filter molded product and the dispersion of purification components are uneven, resulting in excellent filtration. There is also a problem that performance cannot be secured. Furthermore, it is difficult to coat the outer surface of the curved filter molded body with a sheet-like covering member, and even if it can be covered, the covering member does not follow the outer surface well, and the covering member is wrinkled and the appearance is poor. There is also a problem.

  Then, the subject of this invention is enabling it to manufacture the curve-shaped filter molded object which has the outstanding filtration performance at an inexpensive manufacturing cost.

  In order to solve the above-mentioned problems, the present invention is a porous material in which a purification component is dispersed in a polymer as a binder, and is used as the binder in the manufacturing method of a filter molded body for water treatment curved in the longitudinal direction. A mixing and stirring step of mixing and stirring the raw material of the solid polymer and the purification component in the form of powder, granules or fibers, and a filling step of filling the mixed and stirred raw material into a mold having a linear cavity; A primary forming step in which the mixed raw material filled in the mold is heated and then pressed to form a linear shape, a cooling and solidifying step in which the primary molded body formed in the primary forming step is cooled and solidified, and then released. A reheating step of reheating and softening the molded primary molded body, and a bending step of bending the softened primary molded body between a pair of bending dies having opposing curved surfaces to bend in the longitudinal direction Was adopted a method comprising the is curved shaped body and a finishing step of the filter forming body is curved so cool and harden between the bending tool.

  That is, the mixed raw material obtained by mixing and stirring the solid polymer as a binder and the purification component is heated and pressurized in a mold having a linear cavity, and then cooled and solidified, so as to obtain a linear primary molded body first, The obtained primary molded body, which has been softened by reheating, is clamped between bending dies to bend in the longitudinal direction, and this is cooled and cured to obtain a curved filter molded body, resulting in an expensive cavity. In addition, the mixed raw material is uniformly pressurized in a mold having a linear cavity so that a curved filter molded body having excellent filtration performance can be manufactured at a low manufacturing cost. .

  Note that the pair of bending dies has a simple shape and a low die cost as compared with the dies used in the primary molding process. In addition, the distribution of voids and the dispersion of purification components in the porous filter molded body are determined by the primary molding process in which the filter is molded into a linear shape by heating and pressurizing, and hardly changes in the curved bending process. In addition, it is possible to make the distribution of the voids and the dispersion of the purification components uniform, and to have excellent filtration performance.

  The primary molded body is a long one, the long primary molded body is cut into a predetermined length, and supplied to a subsequent reheating step, a bending and bending step, and a finishing step. It is also possible to obtain a plurality of filter molded bodies.

  By using a polymer as the binder having a low melt index with a melt index of 1.1 to 2.3 g / 10 min (ASTM D1238, 190 ° C., 15 kg Load), heating and pressurization during the primary molding process are performed. While ensuring the fluidity of the molten polymer to some extent, the purification component can be fixed with a small amount, and the polymer is prevented from flowing into the irregularities and pores of the purification component such as activated carbon, ensuring excellent filtration performance Can be secured. The melt index is a scale representing the fluidity at the time of polymer melting, and the smaller this value, the lower the fluidity.

  The blending ratio of the solid polymer in the mixing and stirring step is 5 to 50% by mass, preferably 7 to 20% by mass. If the blending ratio is less than 5% by mass, cracks may occur on the outer surface when the primary molded body is bent in the bending process. If the blending ratio exceeds 50% by mass, the surface of the purification component is covered with a polymer. This is because the filtration rate increases and the filtration performance decreases.

The density of the primary molded body cooled and solidified in the cooling and solidification step is preferably 0.35 to 0.65 g / cm ³ . If the density is less than 0.35 g / cm ^3, it may become brittle and break in the subsequent bending process, and if it exceeds 0.65 g / cm ³ , the porous voids decrease and the flow rate of treated water decreases. Because.

  The clamping pressure between the bending dies in the bending process may be 3 to 10 MPa. In addition, if the pair of bending dies are a pair of upper and lower pairs, the clamping pressure of 3 to 10 MPa can be obtained by the weight of the upper mold, and a separate clamping means can be dispensed with.

  By providing a coating step of coating the outer surface of the primary molded body with a sheet-like coating member between the cooling and solidifying step and the reheating step, the outer surface of the curved filter molded body can be easily and It can coat | cover with a coating | coated member so that the favorable external appearance without a wrinkle etc. may be exhibited.

  By providing a linear core at the center of the linear cavity in the mold in the filling step, and forming a central hole extending in the longitudinal direction in the primary molded body, the filter molded body is cylindrical, Water can be filtered between the outside of the filter molded body and the center hole.

  The central hole of the primary molded body may penetrate both end sides in the longitudinal direction.

  The central hole of the primary molded body may be closed at one end in the longitudinal direction.

  The longitudinal length of the closing portion that closes one end of the center hole is preferably in the range of 0.5 to 10 times the wall thickness of the primary molded body at the site where the center hole is located. When water is filtered between the outside of the filter molded body and the center hole, if the length dimension of the closed portion is less than 0.5 times the wall thickness, the filtration performance at the closed portion may be insufficient. If it exceeds 10 times, the volume of the center hole becomes narrow, and there is a possibility that a necessary flow rate cannot be secured.

  In the method for producing a filter molded body according to the present invention, a mixed raw material obtained by mixing and stirring a solid polymer as a binder and a purification component is heated and pressurized in a mold having a linear cavity, and then cooled and solidified, and then first linearly Filter shaped body in which a primary molded body having a shape is obtained, and the obtained primary molded body is reheated and softened to bend between the bending dies and curved in the longitudinal direction, and then cooled and cured. Therefore, a curved filter molded body having excellent filtration performance can be manufactured at a low manufacturing cost.

The longitudinal cross-sectional view which shows the filter molded object of 1st Embodiment manufactured with the manufacturing method which concerns on this invention. The flowchart which shows the process of the manufacturing method of the filter molded object which concerns on this invention. (A), (b) is a longitudinal cross-sectional view which shows the process in which the mixed raw material for filter molded bodies of FIG. 1 is filled in the mold in the filling step. The longitudinal cross-sectional view which shows the state which pressurizes, after heating the mixed raw material filled at the filling process of FIG. 3 at a primary formation process. (A) is a longitudinal cross-sectional view showing a state in which the primary molded body formed in the primary forming step of FIG. 4 is cooled and solidified in the cooling and solidifying step and released, and (b) is a step of covering the primary molded body in (a). Longitudinal section showing the state covered with FIG. 2 is an exploded perspective view showing a bending die used in the bending process of FIG. (A), (b) is a longitudinal cross-sectional view which shows the process of curving the primary molded object of FIG.5 (b) using the bending die of FIG. The graph which shows the measurement result of the initial stage filtration flow rate in an Example The graph which shows the measurement result of the chlorine removal rate in each flow level in an Example Cutaway longitudinal sectional view showing an example in which a water purifier using the filter molded body of FIG. 1 is mounted inside a curved faucet The longitudinal cross-sectional view which shows the filter molded object of 2nd Embodiment manufactured with the manufacturing method which concerns on this invention. (A), (b) is a longitudinal cross-sectional view which shows the process in which the mixed raw material for filter molded objects of FIG. 11 is filled in a mold by a filling process. The longitudinal cross-sectional view which shows the state pressurized after heating the mixed raw material filled at the filling process of FIG. 12 at a primary molding process. (A) is a longitudinal cross-sectional view showing a state in which the primary molded body molded in the primary molding step of FIG. 13 is cooled and solidified in the cooling and solidifying step and released, and (b) is a step of covering the primary molded body in (a). Longitudinal section showing the state covered with Cutout longitudinal sectional view showing an example in which a water purifier using the filter molded body of FIG. 11 is mounted inside a curved faucet

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a filter molded body 1 according to a first embodiment manufactured by a manufacturing method according to the present invention. This filter molded body 1 is used for a water purifier of the type inserted into a curved faucet, has a center hole 1a penetrating to both ends at the center, is a cylindrical shape curved in the longitudinal direction, The surface is covered with a sheet-like covering member 2. One end side of the filter molded body 1 is closed with a separate cap member or the like, and as shown by an arrow in the figure, the water to be treated flows into the curved filter molded body 1 from the outer peripheral side, and the treated water is treated. Flows out from the center hole 1a to the other end.

  The filter molded body 1 is made of a high molecular weight, low melt index ultrahigh molecular weight polyethylene having an average molecular weight of 200,000 to 5,000,000 as a binder polymer, granular activated carbon of 60 to 200 mesh pass, and powder of 200 or less mesh pass. It is a porous material in which a mixture of granular activated carbon in a ratio of 2 to 1 is dispersed as a purification component. Granular and powdered activated carbon as a purification component is fixed so as to be exposed in a porous void, and filters chlorine, organic matter, and the like contained in treated water passing through the void.

The sheet-like covering member 2 is formed of a non-woven fabric of polyethylene fiber having a basis weight of 15 to 60 g / m ² , and primarily filters relatively large foreign matters such as dust in the treated water to form a porous filter. It also serves to prevent the voids in the body 1 from being clogged. The covering member 2 can also be formed of a nonwoven fabric of other synthetic fibers such as a polypropylene fiber, a polyvinyl alcohol fiber, a polyacrylonitrile fiber, a polyvinyl chloride fiber, and the nonwoven fabric has no fear of opening a hole due to damage or the like. Therefore, the primary filtration function can be stably maintained. In addition, a woven fabric such as a synthetic fiber can be used as the covering member 2.

  FIG. 2 is a flowchart showing the steps of the method for producing a filter molded body according to the present invention. First, in the mixing and stirring step, an ultrahigh molecular weight polyethylene (Hostona Gmbh, Hostalen GUR2105) having a melt index of 1.5 g / 10 min (ASTM D1238, 190 ° C., 15 kg Load) in which a granular polymer as a binder is combined in a bunch of grapes. ) And the granular and powdered activated carbons as raw materials, these raw materials are mixed so that the blending ratio of the solid polymer is 15% by mass, and the activated carbon as a purification component is stirred to be uniformly dispersed. Then, the mixed raw material 3 is prepared. Below, the case where the filter molded object 1 of FIG. 1 is manufactured is demonstrated.

  In the next filling step, as shown in FIG. 3 (a), a longitudinally straight cavity with a circular cross section is provided, and a core 11 that forms a center hole 4a of the primary molded body 4 described later is provided at the center. The tip of the funnel 14 is inserted into the mold 10 from above to the bottom of the cavity, and the mixed raw material 3 is put into the funnel 14. Thereafter, as shown in FIG. 3B, the funnel 14 is extracted upward, and the mixed raw material 3 is filled in the mold 10. The core 11 is erected integrally with a bottom mold 12 that is detachable, and is formed so as to protrude from the mixed raw material 3 that has been charged. The mixed raw material 3 may be filled in the mold 10 without using the funnel 14, but by thus inserting the tip of the funnel 14 deeply into the cavity and extracting it, the stirring effect at the time of extracting the funnel 14 can be used. The dispersion state of the purification component in the filled mixed raw material 3 can be ensured satisfactorily.

  In the next primary molding step, the mixed raw material 3 filled in the mold 10 is heated at 200 ° C. for 1 hour, and then the upper mold 13 is inserted into the cavity from above as shown in FIG. To form a linear shape. The upper mold 13 is provided with a hole 13 a into which the core 11 protruding from the mixed raw material 3 is fitted.

  In the next cooling and solidifying step, the primary molded body 4 formed into a linear shape is cooled and solidified and released. When the mold is released, although not shown, the bottom mold 12 with the core 11 standing is pulled out first, and when the upper mold 13 is pushed in, the linear primary molded body 4 is pushed downward.

FIG. 5A shows the released primary molded body 4. This primary molded body 4 is formed with a central hole 4a penetrating to both ends at the center, and is made porous with a density of 0.50 g / cm ³ by adjusting the applied pressure in the primary molding step. Granular and powdered activated carbon as a purification component is fixed so as to be exposed in the gap.

  In the next coating step, as shown in FIG. 5 (b), the outer peripheral surface of the primary molded body 4 is coated with a non-woven fabric of polyethylene fibers as the sheet-shaped coating member 2. This coating is performed by heat-sealing the ends of the nonwoven fabric wound around the outer peripheral surface of the primary molded body 4. The covering member 3 may be wound around the primary molded body 4 manually or a dedicated winding device may be used, and the covering member 2 is coated so as to cover the outer peripheral surface of the linear primary molded body 4. It can be easily wound, and there is no appearance defect that causes wrinkles. Also, heat fusion can be easily performed by placing a heating body of about 100 ° C. such as an iron along the linear shaped primary molded body 4.

  After that, in the reheating step, the primary molded body 4 covered with the covering member 2 is reheated and softened in a hot air oven or the like at about 140 to 180 ° C., and in the bending bending process, the softened primary molded body 4 is softened. Then, it is bent in the longitudinal direction using a pair of upper and lower bending dies 15.

  FIG. 6 shows the pair of upper and lower bending dies 15. The bending die 15 includes an upper die 16 having an arc-shaped cross-sectional groove 16a curved downward and a lower die 17 having an arc-shaped cross-sectional groove 17a curved concavely, and an upper die combined from above and below. 16 and a lower die 17 are inserted into both end portions of the mold grooves 16a and 17a from both sides, and includes a pair of end surface pressing members 18 that press the end surface of the curved primary molded body 4. The upper die 16 is provided with guide holes 16b and the lower die 17 is provided with two guide pins 17b. The upper die 16 is lowered toward the lower die 17 by these guides. In addition, each end surface pressing tool 18 is provided with a hook 18a that is locked to the end surfaces of the upper mold 16 and the lower mold 17 and positions the insertion position.

  7A and 7B show a process of bending the primary molded body 4 using the bending die 15. As shown in FIG. 7A, the reheated primary molded body 4 is set in the mold groove 17a of the lower mold 17, and the upper mold 16 is placed thereon with the position of the mold groove 16a aligned. After that, as shown in FIG. 7 (b), the upper die 16 is guided and lowered by the guide pins 17b, and a pair of end surface pressing tools 18 are inserted into both end portions of the die grooves 16a and 17a from both the left and right sides. The primary molded body 4 is bent so as to be curved along the upper and lower grooves 16a and 17a. At this time, since the reheated primary molded body 4 is softened, it can be bent and deformed by a pressure of about 3 to 10 MPa, and can be bent only by its own weight of the upper die 16. The covering member 2 covering the outer peripheral surface is also curved together with the primary molded body 4 while maintaining a good appearance without wrinkles.

  In the final finishing step, the both ends shown in FIG. 1 are left by leaving the molded body curved for about 30 minutes to 1 hour in the state shown in FIG. A filter molded body 1 having a central hole 1a penetrating into the center is manufactured.

  As an example, a curved filter molded body shown in FIG. 1 was prepared. As a comparative example, as shown in FIG. 5B, a filter molded body having a linear shape was also prepared. About the filter molded object of these Examples and the comparative example, according to the household water purifier test method (JIS S3201: 2010), the initial filtration flow rate and the removal rate of the free residual chlorine in each flow level were measured. The hydrodynamic pressure was 0.05 MPa, each filter molded body had an outer diameter of 25 mm, a through hole diameter of 9 mm, a length of 120 mm, and the curvature radius of the filter molded body of the example was 280 mm.

  FIG. 8 shows the measurement results of the initial filtration flow rate in the household water purifier test described above. The initial filtration flow rate of the filter molded body of the example is almost the same as that of the linear shape of the comparative example, and the porous voids in the primary molded body are well maintained even when the bending is performed after the primary molding described above. You can see that

  FIG. 9 shows the measurement results of the free residual chlorine removal rate at each flow level. The removal rate of free residual chlorine is almost the same as that of the comparative example of the molded filter, and it can be seen that even if the curved molding is performed after the primary molding, the fixed state of the purification component in the gap is maintained well. .

  FIG. 10 shows an example in which a water purifier using the filter molded body 1 of the first embodiment shown in FIG. 1 is mounted inside a curved tap 30. This faucet 30 is for a shower attached to the tip of a hose 31, and a cartridge-type water purifier using a filter molded body 1 inside a curved gripping portion 30b connected to the faucet portion 30a of the faucet 30. Is inserted and installed.

  The water purifier includes a cap member 21 that closes the upstream side of the center hole 1 a of the filter molded body 1, and a water passage member 22 that is attached to the downstream side of the filter molded body 1. The water flowing from the hose 31 into the grip portion 30a flows from the outer diameter side of the filter molded body 1 covered with the covering member 2, and the water filtered by the filter molded body 1 flows out into the central hole 1a. The water flowing out to the center hole 1a flows out from the opening of the water passage member 22 to the faucet portion 30a.

  FIG. 11 shows a filter molded body 1 according to a second embodiment manufactured by the manufacturing method according to the present invention. The basic structure of the filter molded body 1 is the same as that of the first embodiment, except that one end side of the center hole 1a is closed. The length L of the closed portion 1b on one end side is 0.5 to 10 times the thickness T of the portion where the central hole 1a is located, and the outer end surface of the closed portion 1b is covered with a sheet-like covering member 2a. ing. Also in this embodiment, as shown by arrows in the figure, the treated water flows into the curved filter molded body 1 from the outer peripheral side, and the treated water flows from the center hole 1a to the other side opposite to the closed portion 1b. It flows out to the end side. As in the first embodiment, the filter molded body 1 is a porous material in which granular and powdered activated carbon is mixed and dispersed in ultrahigh molecular weight polyethylene, and the covering members 2 and 2a are made of polyethylene fibers. It is formed of non-woven fabric.

  Below, the manufacturing process of the filter molded object 1 of 2nd Embodiment is demonstrated. Since the mixing and stirring step, the cooling and solidifying step, the reheating step, the bending and bending step, and the finishing step are the same as those in the first embodiment, description thereof is omitted.

  FIGS. 12A and 12B show a filling step for filling the mold 10 with the mixed raw material 3 mixed and stirred in the mixing and stirring step in the same manner as in the first embodiment. In this filling step, the height of the core 11 erected on the bottom mold 12 is formed so as to be buried in the charged mixed raw material 3 as shown in FIGS. 3 (a) and 3 (b). Different from that of the first embodiment shown. Others are the same as those in the first embodiment, and the mixed raw material 3 is charged using a funnel 14. After the mixed raw material 3 is charged, the funnel 14 is extracted upward.

  FIG. 13 shows the next primary forming step. In the primary molding step, the heated mixed raw material 3 is pressurized by the upper mold 13 with the core 11 buried in the mixed raw material 3 in the first embodiment shown in FIG. And different. Therefore, as shown in FIG. 14 (a), a central hole 4a whose one end is closed by the closing portion 4b is formed in the primary molded body 4 which has been cooled and solidified in the next cooling and solidifying step.

  FIG. 14B shows the next covering step. In this covering step, the outer end face of the closing portion 4b on one end side of the center hole 4a is also covered with a sheet-like covering member 2a similar to the outer peripheral face, as shown in FIG. Different from the embodiment. After that, the primary molded body 4 in which the outer peripheral surface and the outer end surface of the closing portion 4b are covered with the covering members 2 and 2a is subjected to the reheating process, the bending and bending process, and the finishing process as in the first embodiment. As a result, the filter molded body 1 shown in FIG. 11 is obtained. In addition, you may mount | wear with the coating | coated member 2a of the outer side end surface of the obstruction | occlusion part 4b after a bending process.

  FIG. 15 shows an example in which the water purifier using the filter molded body 1 of the second embodiment shown in FIG. 11 is mounted inside the curved tap 30. This faucet 30 is also for a shower attached to the tip of the hose 31, and is a cartridge type water purifier using the filter molded body 1 inside a curved gripping portion 30b connected to the faucet portion 30a of the faucet 30. Is inserted and installed.

  In this water purifier, the closed portion 1b side where the center hole 1a of the filter molded body 1 is closed is directed to the upstream side. Therefore, a cap member that closes the upstream side of the center hole 1a can be eliminated. Similar to the first embodiment shown in FIG. 10, a water passage member 22 is attached to the downstream side of the filter molded body 1, and the water flowing from the hose 31 into the grip portion 30 a is filtered. Water flowing from the outer diameter side of the body 1 covered with the covering member 2 and the closed portion 1b side covered with the covering member 2a and filtered by the filter molded body 1 flows out to the central hole 1a. The water flowing out to the center hole 1a flows out from the opening of the water passage member 22 to the faucet portion 30a.

In each of the above-described embodiments, the filter molded body has a cylindrical shape having a center hole. However, the filter molded body according to the present invention can also have a columnar shape without a center hole. It can also be a polygonal column.
The

  In each of the above-described embodiments, one filter molded body is obtained from one primary molded body. However, the primary molded body is long and the long primary molded body is cut to a predetermined length. It is also possible to supply a plurality of filter molded bodies from one primary molded body by supplying them to the subsequent reheating step, bending and bending step, and finishing step.

  In each of the embodiments described above, the filter molded body according to the present invention can be used for a water purifier attached to another faucet. It can also be used for the treatment of middle water and sewage.

DESCRIPTION OF SYMBOLS 1 Filter molded object 1a Center hole 1b Blocking part 2, 2a Cover member 3 Mixed raw material 4 Primary molded object 4a Center hole 4b Blocking part 10 Mold 11 Core 12 Bottom mold 13 Upper mold 13a Hole 14 Funnel 15 Bending mold 16 Upper mold 16a Mold groove 16b Guide hole 17 Lower mold 17a Mold groove 17b Guide pin 18 End face pressing tool 18a ａ 21 Cap member 22 Water passage member 30 Faucet 30a Faucet part 30b Grasping part 31 Hose

Claims (10)

  In the manufacturing method of the filter molded body for water treatment which is a porous material in which a purification component is dispersed in a polymer as a binder and is curved in the longitudinal direction, the solid polymer which is the binder, and powder, granules or fibers A mixing and stirring step of mixing and stirring the raw materials with the purification component, a filling step of filling the mixed and stirred mixed raw materials into a mold having a linear cavity, and heating the mixed raw materials filled in the mold A primary molding step of pressing to form a linear shape, a cooling and solidification step of cooling and solidifying the primary molded body molded in the primary molding step, and reheating and softening the released primary molded body. A re-heating step, a bending step of bending the softened primary molded body between a pair of bending dies having opposing curved surfaces to bend in the longitudinal direction, and a curved molded body between the bending dies. cold Method for producing a filter molded body characterized by comprising the finishing process and filter moldings curved cured.   The method for producing a filter molded body according to claim 1, wherein the polymer as the binder has a low melt index with a melt index of 1.1 to 2.3 g / 10 min (ASTM D1238, 190 ° C, 15 kgLoad).   The manufacturing method of the filter molded object of Claim 1 or 2 which made the compounding ratio of the said solid polymer in the said mixing and stirring process 5-50 mass%. The method for producing a filter molded body according to any one of claims 1 to ³ , wherein the density of the primary molded body cooled and solidified in the cooling and solidifying step is 0.35 to 0.65 g / cm ³ .   The manufacturing method of the filter molded object in any one of Claims 1 thru | or 4 which made the pinching pressure between the said bending molds in the said bending process into 3-10 MPa.   The filter molded body according to any one of claims 1 to 5, wherein a covering step for covering an outer surface of the primary molded body with a sheet-shaped covering member is provided between the cooling and solidifying step and the reheating step. Method.   The linear core is provided in the center of the linear cavity in the mold in the filling step, and a central hole extending in the longitudinal direction is formed in the primary molded body. Manufacturing method of the filter molded body.   The manufacturing method of the filter molded object of Claim 7 which shall penetrate the center hole of the said primary molded object to the both ends side of a longitudinal direction.   The method for producing a filter molded body according to claim 7, wherein the central hole of the primary molded body is closed at one end in the longitudinal direction.   The length dimension in the longitudinal direction of the closing part that closes one end side of the center hole is in a range of 0.5 to 10 times the wall thickness of the primary molded body at the site where the center hole is located. The manufacturing method of the filter molded object of description.

Images