JP3550567B2 - Filter manufacturing equipment - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an oil or air filter for automobiles and electronic devices, daily goods and various filters thereof, and a mold for a filter that can be used in a wide range such as a cover of accessories or parts of various devices and a net. It is particularly useful in an integrated plastic filter.
[0002]
[Prior art]
In a conventional fine mesh filter having a plurality of fine ribs of this kind, there is no mold and a manufacturing method which are fine and have a good product yield with a small rib interval due to difficulty in plastic molding. In the conventional mold and manufacturing method, the molten resin is directly injected from the gate of the mold into the plurality of small-diameter rib portions of the filter and the frame which is the frame portion, and thus has the following disadvantages. If the molten resin is injected at a low injection pressure, the material does not reach the end due to insufficient injection pressure, and the rib can be removed at a portion far from the gate. In addition, as the rib interval becomes narrower, the injection pressure becomes insufficient, and it becomes more and more difficult to integrally form the plurality of small-diameter rib portions and the frame. If the injection pressure is set to a high pressure, it is easy to prevent the ribs from coming off and to integrally form the plurality of small-diameter rib portions and the frame, but for that purpose, the apparatus must be enlarged, and in some cases, the ribs may be required. The gap was closed and the filter or net did not function, and pressure adjustment in the manufacturing process was also difficult.
[0003]
[Problems to be solved by the present invention]
Therefore, the present invention has developed a method of forming a fine mesh filter by injection molding, which has been considered difficult in the past, and the plastic material reaches from the gate to the ends of a plurality of fine small diameter ribs, which is a disadvantage of the conventional injection molding method. It is intended to solve all the problems at once, such as the fact that the injection molding apparatus becomes large and expensive in order to make the plastic material reach the end.
[0004]
[Means to solve the problem]
The filter manufacturing apparatus of the present invention is characterized by the following. In claim 1, there is provided a die apparatus for manufacturing a filter having a mesh composed of a plurality of small-diameter ribs by injection molding, wherein the apparatus has the following configuration.
(A) A mesh groove formed on the upper and / or lower mold of the mold apparatus for forming a plurality of small-diameter ribs.
(B) A frame groove formed on the outer periphery of the upper and / or lower mold of the mold device so as to surround the mesh groove.
(C) To store the molten resin formed as a groove having a diameter larger than the mesh groove and injected from the injection molding machine, and to pressurize and discharge the molten resin by not directly communicating with the frame groove. And a guide groove formed on the upper and / or lower mold net grooves, wherein the guide groove is substantially symmetrical with respect to a gate for injecting a molten resin.
3. The filter manufacturing apparatus according to claim 2, wherein the guide groove has a shape similar to a shape of a frame groove in the mold apparatus according to claim 1.
4. A filter manufacturing apparatus according to claim 1, wherein the guide band groove is formed in an arc shape in the mold apparatus according to claim 1.
5. The filter manufacturing apparatus according to claim 4, wherein the guide groove is formed in a rectangular shape in the mold apparatus according to claim 1.
6. The filter manufacturing apparatus according to claim 5, wherein the mold apparatus according to claim 1 has the following configuration.
(A) A cutter in which the cutting edge of the cutter of the die cutting device is slightly longer than the height of the mesh groove to form the mesh groove.
(B) A cutter in which the cutting edge of the cutter is tapered and at least the tapered portion is mirror-finished.
(C) An ultrasonic vibration device for applying ultrasonic vibration to the cutter.
7. The filter manufacturing apparatus according to claim 5, wherein the blade of the cutter has a semicircular shape.
8. The filter manufacturing apparatus according to claim 5, wherein the cutting edge of the cutter has a two-stage V-shape.
In the eighth aspect of the present invention, in the filter mold having a plurality of small-diameter ribs according to the first aspect, the net groove and the guide band groove are separately formed in order to cut and separate the net portion and the guide band after injection molding. An apparatus for manufacturing a filter, wherein the apparatus is provided in a region of (1).
According to a ninth aspect of the present invention, in the mold for a filter comprising a plurality of small-diameter ribs according to the first aspect, the guide band is formed substantially radially from a substantially center of the filter toward the frame body groove. An apparatus for manufacturing a filter, wherein gates for injecting molten resin are provided near a central portion and an end portion, respectively.
11. The filter manufacturing apparatus according to claim 10, wherein the mold apparatus for manufacturing a filter having a mesh including a plurality of small-diameter ribs by injection molding has the following configuration.
(A) A mesh groove formed on the upper mold and / or the lower mold for forming a plurality of small-diameter ribs.
(B) A frame groove formed on the outer periphery of the upper and / or lower mold so as to surround the mesh groove.
(C) To store the molten resin formed as a groove having a diameter larger than the mesh groove and injected from the injection molding machine, and to pressurize and discharge the molten resin by not directly communicating with the frame groove. An induction band groove formed on the upper and / or lower mold net grooves and having a gate for injecting a molten resin.
(D) An apparatus for manufacturing a cylindrical or box-shaped filter for manufacturing a filter, wherein the guide band groove is formed on a top surface and a side surface of the filter.
In claim 11, in the mold device for a cylindrical or box-shaped filter according to claim 10, the top surface and the side surface of the cylindrical or box-shaped filter are placed on a horizontal mating surface of an upper mold and a lower mold. An apparatus for manufacturing a filter having a tubular shape or a box shape for manufacturing a filter, wherein the filter can be integrally formed with the filter.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a basic mold shape of the present invention. The mold may be a mold suitable for custom-made mounting in a mold called a nest. When the injection molding is performed by the mold, the apparatus, and the manufacturing method of the filter of the present invention, the molten resin flowing from the gate exits to the large-diameter induction band groove, which is not directly connected to the frame body groove and reaches a dead end. Therefore, a certain pressure is stored there and then it is press-fitted into a thin mesh groove communicating with it, so that the molten resin works to flow to the end of the mesh groove, and it is possible to form a plurality of fine small-diameter rib filters by low pressure molding. Become. At that time, the vertical rib grooves and the horizontal rib grooves of the mesh grooves communicate with each other at the intersection and are integrated with each other, so that a physically strong small-diameter rib filter can be formed. Further, by making the shape of the guiding band groove similar to the shape of the outer shape of the filter, the molding efficiency can be greatly improved.
[0006]
The mold 1 includes an upper mold 1a and a lower mold 1b, in each of which a mesh groove 2, an induction band groove 3, and a frame body groove 4 are formed. FIG. 2 is a sectional view of the upper mold 1a and the lower mold 1b. The upper mold 1a is provided with a plurality of small-diameter ribs and a gate 5 into which a molten resin 14 for forming a frame is injected. In the upper die 1a, the guide band groove 3 guides the molten resin 14 from the gate 5 to the lateral rib groove 2a to inject the molten resin 14 to the end of the lateral rib groove 2a. It is possible to press-fit the molten resin 14 uniformly into the narrow rib groove 2a from there while guiding the molten resin 14 into the space of the guide band groove 3. In the lower mold 1b, the induction band groove 3 functions to make the molten resin 14 flow uniformly toward the longitudinal rib groove 2b as in the upper mold 1a. Further, since the guiding band groove 3 has a radial shape with respect to the entire filter and is not directly connected to the frame groove 4, the molten resin 14 is located on the frame groove 4 side where the molten resin 14 can easily flow. This prevents the fluid from flowing and impeding the inflow into the renal reticular groove 2 and can generate the pressure necessary for injecting the molten resin 14. The molten resin 14 is injected into the mesh groove 2 through the guide band groove 3 radiating from the gate 5 disposed substantially in the center of the upper die 1a and proceeds in the diffusion direction. There is no backflow. Therefore, the disadvantage that air bubbles generated in the mesh groove 2 are sealed can be eliminated. The cross-sectional shape is preferably a semicircle in terms of fluidity, but is not limited to a trapezoidal shape, a semi-elliptical shape, or the like. Since the horizontal rib groove 2a and the vertical rib groove 2b are formed so as to communicate with the guiding band groove 3, when the upper die 1a and the lower die 1b are pressed together, the intersection is formed by a plurality of small-diameter ribs integrally fused. A filter can be created. Therefore, physical strength can be maintained. Furthermore, in the case of the mold 1 in which the frame groove 4 is formed, it is difficult to form the mold so far, and a plurality of small-diameter rib filters with a frame, which have been performed in two steps and three steps, can be integrally formed in one step. .
[0007]
FIGS. 3 and 4 show another example of the shape of the guiding band groove 3. FIG. 3A shows a cross-shaped guiding band groove 3 formed perpendicularly and parallel to the horizontal rib groove 2a. FIG. 3B is a cross-sectional view of the lower die 1b in which the guiding band grooves 3 are formed obliquely to the lower die 1b. When the guiding band grooves 3 are pressed together, the guiding ribs are large-diameter ribs formed by the radial guiding band grooves 3 in FIG. A filter including the band 3b and the plurality of small-diameter ribs 2c, which are a plurality of fine small-diameter ribs, is obtained. Similarly, in FIG. 4 (a), a T-shaped symmetrical shape is provided, and in FIG. 4 (b), an H-shaped guiding band groove 3 is provided to provide an outer periphery similar to the frame as shown in FIG. 4 (c). A filter including the induction band 3b having the following formula is obtained. Each of the above-mentioned filter dies is another embodiment for more surely producing a plurality of fine and small-diameter rib filters. Although not shown, various shapes such as a C-shape for a circular filter, a rectangular shape for a square filter, and other shapes such as a broken line can be applied to the shape of the guiding band groove 3 similar to the outer periphery of the filter. FIG. 5 shows still another embodiment. In this case, only one of the upper die 1a and the lower die 1b is provided with the horizontal rib groove 2a, the vertical rib groove 2b, and the guide band groove 3, and in the figure, the appearance of the filter as a product is considered. The upper die 1a is provided with horizontal rib grooves 2a, vertical rib grooves 2b, and guide band grooves 3 so that the product surface sometimes becomes round. However, it goes without saying that the lower rib 1b can be provided with the horizontal rib groove 2a and the vertical rib groove 2b at the same time. Further, an auxiliary guide groove 3 may be provided in order to increase molding accuracy and yield. In this case, since the auxiliary guide groove 3a is independent of the guide band 3, it is better to provide the gates 5 respectively. FIG. 6 shows the cross section.
[0008]
Next, a mold will be described in which the guide band groove 3 is made invisible to the filter product as the guide band 3b of the large diameter rib. In conclusion, the guide band 3 of the present invention exists on the mold, but the guide band 3a formed by the guide band 3 can be separated from the product part at the time of finishing the product. Referring to FIG. 7, the upper die 1a is provided with a guide band groove 3 and a frame groove 4 at one end side of the lateral rib groove 2a, and the lower die 1b is provided with a guide band at one end side of the vertical rib groove 2b. A groove 3 and a frame groove 4 are provided. By pressing these molds and injecting the molten resin 14 from the gate 5, a filter is completed in a form in which the L-shaped guiding band 3b is outside the plurality of small-diameter ribs 2c. If this is cut later so as to be divided into the guide band 3b and the plurality of small-diameter ribs 2c, a filter product without the large-diameter guide band 3b can be obtained.
[0009]
Then, a description will be given of a grooving cutter which is indispensable for forming the above-mentioned mold. Conventionally, in this type of cutter, rotary cutting with a super steel tip has been usual, but since the super steel is expensive and wear is remarkable due to rotation, these improvements have been required. Therefore, the present invention provides a cutter that can be used practically even with a low-cost cutter edge without rotating cutting. Referring to FIG. 8 (a), it is shown that the net groove 2 formed on the mold 1 is formed by the cutter 6, and if the cutting edge is too long in the height direction, it is easy to break. Slightly longer than the depth of According to the results of the experiment, a 1.0 mm-high cutting edge is appropriate for the 0.6 mm-high net groove 2. The tapered portion 6b is provided on the cutting edge on the cutting direction side, and the tapered portion 6b is mirror-finished. Since the cutter 6 is made to move in a straight line instead of in a rotary movement, the wear of the cutting edge is small and even a high-speed high-speed steel can be used sufficiently. or. The surface of the net groove 2 is mirror-finished by giving a minute vibration by the ultrasonic vibration device 7 when the cutter 6 moves straight. FIGS. 8 (b) and 8 (c) show another embodiment of the cutting edge, which has a two-stage V-shape or semicircular shape in order to improve the flow of the molten resin 14 into the mesh groove 2. If the mold of the present invention is manufactured with such a cutter, the powder at the time of lapping becomes difficult to come out, and the surface roughness becomes 2-3 microns, and the intersection of the plurality of small-diameter ribs 2c is beautifully finished. When the feed speed of the cutter is 2,000 m / min, which is about five times the conventional cutting speed, a mold suitable for mass production can be obtained.
[0010]
FIG. 9 shows a manufacturing method related to the present invention, in which a first gate 5a, a first valve 10a, and a second gate 5a are used to inject the molten resin 14 into the frame groove 4 and the guide band groove 3, respectively. 5b and a second gate 10b. When the molten resin 14 is injected at one gate, the injection pressure is weakened until the molten resin 14 reaches the frame groove 4 on the peripheral edge, and sufficient molten resin 14 does not reach the frame groove 4. This results in a phenomenon in which unevenness occurs in the frame. The present invention is intended to prevent this phenomenon. First, by opening the first valve 10a, the molten resin 14 is supplied to the guide band groove 3 and the net groove 2 through the runner 8 and the spool 9. Then, at the time when this is completed, the first valve 10a is closed. At the same time, the second valve 10b is opened to supply the molten resin 14 to the frame groove 4 via the runner 8 and the spool 9. This ensures that the molten resin 14 fills all the grooves of the mold.
[0011]
FIG. 10 shows an improved example of the mold apparatus of the present invention using the spool 9. The feature is that a rod-shaped heater 12 is disposed around the periphery to improve the flow of the molten resin 14 from the spool 9. It is in. Reference numeral 13 denotes an electric wire for supplying electric power to the heater 12. FIG. 11 shows an improved example for facilitating the inflow of the molten resin 14 and increasing the speed thereof. The lower die 1b or the lower die insert 11b placed below the upper die 1a and the upper die insert 11a is shown in FIG. It is made of a material such as aluminum having good heat conductivity. In particular, the present invention is effective for injection molding of a filter having a plurality of fine small diameter ribs as in the present invention. Similarly, FIG. 13 also shows a state in which a pool gate 15 is formed on the upper mold 1a and the upper mold insert 11a instead of a spool having a narrow flow passage in order to facilitate and speed up the flow of the molten resin 14.
[0012]
Next, with reference to FIG. 13, description will be given of an improvement for improving the pushing and cutting at the mating surface of the mold 1. The elastic body 16 such as urethane rubber is provided on the bottom surface of the storage section of the lower mold 1b in which the lower mold insert 11b is stored. Is placed. The top surface of the lower mold insert 11b is made to slightly protrude from the top surface of the lower mold 1b, and when the mold is pushed, it contracts downward due to its elasticity so that the joints of the molds fit exactly. Experimentally, assuming that the depth of the storage portion of the lower mold 1b is about 35 mm, the thickness of the lower mold insert 11b is suitably 25 mm, and the elastic body 16 is suitably about 10.1 to 10.5 mm. Due to this slight protrusion, the press-cutting at the joint of the mold is improved, so that it is possible to prevent burrs from being formed. In particular, it is effective in forming a plurality of fine rib filters having a small diameter as in the present invention.
[0013]
FIG. 14 relates to air bleeding for gas escape, in which air bleeding operation and air blowing operation are alternately performed in air holes 17 provided in the mold 1 for air bleeding. Conventionally, only air was evacuated by vacuum evacuation, which made it difficult to completely remove gas and residues in the groove of the mold 1. In the present invention, a remarkable effect can be expected by adding an operation of blowing air. Although a device for taking in and out of air is not shown, a normal electric pump or the like may be used.
[0014]
FIG. 15A shows an apparatus for producing a plurality of small-diameter rib filters having a cylindrical shape or a box shape. The upper mold insert 11a has the above-described guide band groove 3 and the mesh groove 2 and forms the top surface of the cylindrical filter. The lower mold insert 11b has the guide band groove 3 and the mesh groove 2 on its side surface. The molten resin 14 forms a plurality of small-diameter ribs 2 c on the top surface via a horizontal runner 8, and the molten resin from the gate 5 via the runner 8, the spool 9 and the vertical runner 8. By injecting 14, a plurality of small diameter ribs 2 c on the side surface are formed. After that, if the split mold is separated, a plurality of cylindrical or box-shaped narrow rib filters composed of a plurality of fine narrow ribs having a large-diameter guiding band 3b can be obtained. The side portion may be provided with a large-diameter reinforcing rib 2d that acts in the same manner as the frame in terms of its strength. FIG. 15B shows a plurality of cylindrical or box-shaped small-diameter rib filters obtained by the above-described device, and a guide band 3b is formed on a side surface portion. FIG. 16A shows another embodiment for producing a plurality of small-diameter rib filters having a cylindrical shape, which can be integrally formed on a horizontal mating surface of an upper mold and a lower mold without using a split mold. It is about type. The mesh groove 2 forming the top surface portion 18a and the side surface portion 18b of the cylindrical or box-shaped small-diameter rib filter is formed in the upper die 1a, and the frame groove 4 of the top surface portion 18a and the side surface portion 18b is partially formed. If a common groove is used, the top surface portion 18a and the side surface portion 18b do not separate even after molding, which is convenient during the subsequent welding or bonding process. In the case of the present embodiment, a cylindrical filter cannot be manufactured in one step, but the top surface portion 18a and the side surface portion 18b can be simultaneously formed on the horizontal mating surface of the upper mold and the lower mold, so that a simple structure is provided. There is a merit that it can be molded with a mold. FIG. 16B shows a cylindrical filter made according to this embodiment. FIG. 17A shows another embodiment for producing a triangular prism-shaped small-diameter rib filter, which relates to a mold that can be integrally formed on a horizontal mating surface of an upper mold and a lower mold without using a split mold. Things. The configuration is the same as that of the mold for the cylindrical filter described above, and the only difference is the shape. FIG. 17B shows a cylindrical filter made according to this embodiment.
[0015]
FIG. 12 shows a mold relating to a small filter used for a net such as an earphone and a speaker grill. In such small articles, it is not preferable in terms of performance and appearance that the large-diameter induction band 3b appears on the filter surface in the filter. Therefore, the present invention provides a mold device in which the guiding band 3b does not appear on the filter surface. In a case where the present invention is applied to a net of an earphone, for example, the push-cut surface of the upper mold insert 11a is curved in a concave shape to form the net groove 2 on the entire surface, and the guide band groove 3 is formed below the curved surface. The lower mold insert 11b forms a mesh groove 2 on the entire surface by bending the cut-off surface in a convex shape, and forms the guiding band groove 3 below the curved surface. In this case, the guiding band groove 3 may be provided at one place or at a plurality of places. Also, it is desirable that the number of the guiding band grooves 3 be formed radially on the opposite side by about several. If the guide band 3b is stamped by such a mold apparatus, the guide band 3b is located below the filter and does not cause any problem in performance and appearance.
[0016]
【The invention's effect】
As described above, the present invention forms a large-diameter guiding band groove without directly connecting to the frame of the filter, so that when forming, the guiding band groove is melted into the mesh groove of the small-diameter rib and the frame groove. It also plays the role of a pressurizing part when resin flows in, so it is possible to inject molten resin to the end of the net groove, and it is possible to integrally mold fine and small-diameter rib filters by low-pressure molding, which has been considered difficult in the past. An excellent effect is achieved. The formed plurality of small-diameter ribs have a physical strength because the vertical ribs and the horizontal ribs are integrally fused to form a single plane, and the so-called mesh of the plurality of small-diameter ribs is made uniform. Exhibits excellent functions in terms of performance, such as being sufficiently usable as a precision filter in the medical field. Furthermore, various related devices and accessories necessary for producing the filter of the present invention, such as a cutter for forming a groove and various shapes of the guide band groove 3, are also improved. It has a much better effect in terms of target and function.
Although various embodiments have been described above, it goes without saying that other embodiments using the principle of the present invention are also protected by the present invention.
[Brief description of the drawings]
FIG. 1 is a perspective view of a working die for producing a small-diameter rib filter of the present invention.
FIG. 2 is a sectional view of FIG.
FIG. 3 is a front view of another embodiment of the mold surface of the present invention.
FIG. 4 is a front view of another embodiment of the mold surface of the present invention.
FIG. 5 is a perspective view of another embodiment of the mold of the present invention.
FIG. 6 is a sectional view of FIG. 5;
FIG. 7 is a perspective view of another embodiment of the mold of the present invention.
FIG. 8 is a side view of a cutter used in the mold of the present invention.
FIG. 9 is a front view showing the supply of a molten resin according to the present invention.
FIG. 10 is an enlarged sectional view in which a heater is provided in the mold of the present invention.
FIG. 11 is a cross-sectional view in which a die is combined with a mold of the present invention.
FIG. 12 is a sectional view showing an embodiment of the accessory mold according to the present invention.
FIG. 13 is a cross-sectional view of a mold according to the present invention in which a pool and an elastic body are formed.
FIG. 14 is a cross-sectional view in which an air hole is formed in the mold of the present invention.
FIG. 15 is a sectional view of another embodiment of the present invention for producing a cylindrical filter.
FIG. 16 is a front view of a mold in another embodiment for producing a cylindrical small-diameter rib filter.
FIG. 17 is a front view of a mold in another embodiment for producing a triangular prism-shaped small-diameter rib filter.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 mold 1a upper die 1b lower die 2 mesh groove 2a horizontal rib groove 2b vertical rib groove 2c plural small diameter ribs 2d large diameter reinforcing rib 3 guide band groove 3a auxiliary guide band groove 3b guide band 4 frame body groove 5 Gate 6 Cutter 6a Blade edge 6b Taper portion 7 Ultrasonic vibrator 8 Runner 9 Spool 11 Insert 11a E-type insert 11b Lower mold insert 12 Heater 13 Electric wire 14 Melt resin 15 Accumulate gate 16 Elastic body 17 Air hole 18 Tube shape or Box-shaped filter 18a Top part 18b Side part 19 Plating part

Claims (11)

A mold manufacturing apparatus for manufacturing a filter having a mesh composed of a plurality of small-diameter ribs by injection molding, wherein the apparatus has the following configuration.
(A) A mesh groove formed on the upper and / or lower mold of the mold apparatus for forming a plurality of small-diameter ribs.
(B) A frame groove formed on the outer periphery of the upper and / or lower mold of the mold device so as to surround the mesh groove.
(C) To store the molten resin formed as a groove having a diameter larger than the mesh groove and injected from the injection molding machine, and to pressurize and discharge the molten resin by not directly communicating with the frame groove. And a guide groove formed on the upper and / or lower mold net grooves, wherein the guide groove is substantially symmetrical with respect to a gate for injecting a molten resin. 2. The filter manufacturing apparatus according to claim 1, wherein said guide groove has a shape similar to a shape of a frame groove. 2. The filter manufacturing apparatus according to claim 1, wherein the guide groove is formed in an arc shape. 2. The filter manufacturing apparatus according to claim 1, wherein said guide groove is formed in a rectangular shape. The filter manufacturing apparatus according to claim 1, wherein the apparatus has the following configuration. (A) A cutter in which the cutting edge of the cutter of the die cutting device is slightly longer than the height of the mesh groove to form the mesh groove. (B) A cutter in which the cutting edge of the cutter is tapered and at least the tapered portion is mirror-finished. (C) An ultrasonic vibration device for applying ultrasonic vibration to the cutter. 6. The filter manufacturing apparatus according to claim 5, wherein the cutting edge of the cutter has a semicircular shape. 6. The filter manufacturing apparatus according to claim 5, wherein the cutting edge of the cutter has a two-stage V-shape. The mold for a filter comprising a plurality of small-diameter ribs according to claim 1, wherein, after injection molding, a net groove and a guide band groove are provided in different regions to cut and separate the net portion and the guide band. An apparatus for producing a filter. 2. The mold for a filter comprising a plurality of small-diameter ribs according to claim 1, wherein a guide band is formed substantially radially from a substantially center of the filter toward a frame groove, and a center portion and a vicinity of a terminal portion of the guide band groove. And a gate for injecting the molten resin. A mold manufacturing apparatus for manufacturing a filter having a mesh composed of a plurality of small-diameter ribs by injection molding, wherein the apparatus has the following configuration.
(A) A mesh groove formed on the upper mold and / or the lower mold for forming a plurality of small-diameter ribs.
(B) A frame groove formed on the outer periphery of the upper and / or lower mold so as to surround the mesh groove.
(C) To store the molten resin formed as a groove having a diameter larger than the mesh groove and injected from the injection molding machine, and to pressurize and discharge the molten resin by not directly communicating with the frame groove. An induction band groove formed on the upper and / or lower mold net grooves and having a gate for injecting a molten resin.
(D) An apparatus for manufacturing a cylindrical or box-shaped filter for manufacturing a filter, wherein the guide band groove is formed on a top surface and a side surface of the filter. In the mold apparatus filter of claim 1 0 of the cylindrical shape or a box shape, integrally formed with the cylindrical shape or the top and side portions of the filter box-shaped, upper and lower molds in the horizontal mating plane An apparatus for manufacturing a filter having a cylindrical shape or a box shape, which manufactures a filter characterized by being capable of being manufactured.

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