JP2004345195A - Filter manufacturing device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter manufacturing device which has a few manufacturing processes; realizes the simple and correct fitting of a filter medium; and consequently, can diminish the generation of a non-conforming article, and a method for manufacturing a filter. <P>SOLUTION: The device 13 manufactures a filter 10 structured of the filter medium 12a tensely attached over the lower end opening of a cylindrical body 11. In addition, the device has a mold 16 with a gap 17, for forming flange-like burrs, which is provided on the outer peripheral side of the lower end part of a recessed part 27 for molding. Besides, in the device, a cutting part 22 for cutting burrs, is constituted of an upper end angular part 19a of a punch 19 for extruding the filter 10 from the mold 16 and a lower end angular part 14c of a core part 14b wherein the recessed part 27 for molding is formed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a filter manufacturing apparatus and a manufacturing method for manufacturing a filter configured by attaching a net-like filtering material to one opening of a cylindrical main body by injection molding.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a filter for filtering a liquid, there is a filter configured by attaching a net-like filtering material to one opening of a cylindrical main body. Such a filter is generally formed by injection molding using a mold. Machined. Then, when injection-molding the filter, the filter medium was cut to be larger than the opening edge of the cylindrical main body, and this filter medium was installed in a mold and injection-molded, thereby being integrated with the filter medium. 2. Description of the Related Art A filter formed of a cylindrical main body is formed, and after the filter is formed, a portion of the filter material protruding from an opening edge is removed. Alternatively, a filter is manufactured by cutting a filter material into the same size as the opening edge of the cylindrical body, installing the filter material in a mold, and performing injection molding.
[0003]
[Problems to be solved by the invention]
However, in the former, there is a problem that the filter material that has protruded after the filter is formed must be removed, and the operation is troublesome. In the latter case, it is not necessary to remove the protruding filter medium after the filter is formed, but there is a problem that it is difficult to install the mold at an appropriate position because the filter medium has no margin. Further, in both cases, since the filter material is cut into a certain size in advance, there is a problem that the number of working steps is increased, and when the cylindrical body is formed, the filter material is easily displaced and a filter having high dimensional accuracy is manufactured. Is also difficult. In addition, since many defective products are generated, it is necessary to inspect all the manufactured filters, and there is a problem that much time and labor are required for the inspection.
[0004]
Summary of the Invention
SUMMARY OF THE INVENTION The present invention has been made to address the above-described problems, and has as its object to reduce the number of manufacturing steps, to easily and accurately mount a filter medium, and to reduce the occurrence of defective products. It is an object of the present invention to provide a filter manufacturing apparatus and a manufacturing method that can perform the above-described processes.
[0005]
In order to achieve the above object, the characteristics of the filter manufacturing apparatus according to the present invention are characterized in that a mold including a fixed mold and a movable mold that can move forward and backward with respect to the fixed mold is provided on one of the fixed mold and the movable mold. And a columnar concave portion having one end opened on the divided surface of the fixed die and the movable die, and a cylindrical mold provided in the other of the fixed die and the movable die and inserted into the columnar concave portion to form a cylindrical shape in the mold. It is provided with a pin for forming the concave portion, and an extruding portion for extruding the filter formed in the concave portion for molding from the concave portion for molding. A filter manufacturing apparatus for manufacturing a filter formed by injecting a molding material and attaching a filter medium to an opening at the other end of the cylindrical main body, the other end of a molding recess in a mold. When a space for flash formation is provided on the outer peripheral side of Moni, the tip portion of the extrusion, the extrusion unit is that the formation of the cut portion of the cutting ledge and the wall of the forming recess in sliding contact.
[0006]
The space referred to here may be configured by providing a gap between the molds, or may be configured by a concave portion that matches the size of the burrs. In this case, it is preferable that the filter medium is formed of a ribbon-shaped elongate body, and a filter medium supply device that continuously supplies the filter medium to a gap provided in the mold in a tensioned state.
[0007]
According to the feature of the present invention configured as described above, since a gap for forming a burr is provided on the outer peripheral side of the other end of the forming concave portion provided in the mold, when the filter is formed, A flash is formed around the other end on the outer peripheral side. Further, a cutting portion is constituted by the tip portion of the extruded portion and the wall of the molding concave portion, and the burrs are cut from the filter together with the filtering material.
[0008]
Therefore, when the burred filter formed in the forming recess and the gap is extruded from the forming recess by the extrusion unit, the burrs of the burred filter are automatically cut and removed together with the filtering material from the filter. Can be. For this reason, it becomes easy to cut the filter medium, and as in the conventional case, the filter medium is cut after forming the filter, or the filter medium is cut into a predetermined size in order to eliminate the need for cutting after forming. You do not need to do anything else. In other words, even if it is attempted to cut only the mesh-like filter material at the cutting portion formed by the tip portion of the extruded portion and the wall of the molding concave portion, the filter material is difficult to cut, but the filter material is entangled with burrs. As a result, the thickness becomes large and the filter medium can be easily cut.
[0009]
In addition, the filter medium is formed of a ribbon-shaped long body, and the filter medium is supplied to the other end of the mold forming concave portion in a tensioned state, so that the filter medium can be easily supplied to an appropriate position. At the same time, the displacement of the filter medium does not occur during injection molding. Therefore, the occurrence of defective products due to the displacement of the filter medium is eliminated. In addition, by continuously supplying the filter material, the filter can be efficiently manufactured, which is suitable for mass production.
[0010]
Another structural feature of the present invention is a filter manufacturing method for manufacturing a filter configured by attaching a net-shaped filter material to one opening of a cylindrical main body, wherein the filter is provided in a mold. A step of supplying a ribbon-shaped filter medium to the end of the formed cylindrical forming recess in a tensioned state, a cylindrical body, and a filter medium integrally formed on the outer peripheral portion of the end of the cylindrical body. It consists of a step of injection molding the entangled burrs and a step of cutting and removing the burrs formed on the outer peripheral portion of the end of the cylindrical main body together with the filtering material.
[0011]
In this case, the molding of the cylindrical body and the burr is performed by injecting a molding material into a molding recess provided in the mold and a burr forming gap provided on an outer peripheral side of an end of the molding recess. Can be performed. In addition, cutting and removing the burrs formed at the outer peripheral portion of the end portion of the cylindrical body and the filter entangled with the burrs are performed by forming a filter formed of the cylindrical body and the filtering material in the forming recess into the forming recess. The filter can be extruded from the molding recess by a cutting portion using a shearing force formed by a tip portion of the extrusion portion for extruding from the mold and a wall portion of the molding recess to which the extrusion portion slides.
[0012]
According to the features of the present invention configured as described above, a filter can be manufactured with a small number of steps and with a simple operation. Further, the formation of the burrs for easily cutting the filter medium can be easily performed, and the formation of the burrs facilitates the cutting of the filter medium.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a filter 10 manufactured by the manufacturing apparatus according to the embodiment. This filter 10 is stretched around a transparent cylindrical main body 11 made of polypropylene and a lower end opening of the cylindrical main body 11. It is integrally formed with the provided net-like filtration part 12 made of polyethylene. The filter 10 is attached to a medical device used for artificial dialysis, blood transfusion, infusion, and the like, and is capable of filtering foreign substances of about 20 μm.
[0014]
The filter 10 can be manufactured by the manufacturing apparatus 13 including the injection molding machine shown in FIG. The manufacturing apparatus 13 includes a mold 16 including a fixed mold 14 installed on the lower side, and a movable mold 15 installed on the upper side of the fixed mold 14 and capable of moving up and down with respect to the fixed mold 14. The fixed die 14 includes a punch guide portion 14a and a core portion 14b. The core portion 14b is attached with a small gap 17 provided between the core portion 14b and the punch guide portion 14a. The core portion 14b can be moved up and down with respect to the punch guide portion 14a. The interval can be increased or decreased.
[0015]
In the center of the punch guide portion 14a, an insertion hole 18 having a round cross section extending vertically is formed, and a round bar-shaped punch 19 which also functions as an ejector, which is an extrusion portion, is vertically movable in the insertion hole 18. Is inserted. A portion corresponding to the insertion hole 18 of the punch guide 14a in the core portion 14b is provided with a through-hole portion 20 having the same diameter as the insertion hole 18 so that the upper end portion of the punch 19 can be inserted into the through-hole portion 20. Has become. In addition, an injection hole 21 for injecting a molding material into the through hole 20 is provided in the core portion 14b.
[0016]
The upper end corner portion 19a along the circumference of the upper end surface of the punch 19 and the lower end corner portion 14c along the circumference of the peripheral wall of the through hole 20 in the core portion 14b are both right-angled in vertical cross-sectional shape. It is formed as follows. Further, there is almost no gap between the outer peripheral surface of the punch 19 and the inner peripheral surfaces of the insertion hole 18 and the through hole 20, and the punch 19 slides on the inner peripheral surface of the insertion hole 18 and the through hole 20. It is in a state. Therefore, when the front end of the punch 19 enters the through hole 20 from the insertion hole 18, the object to be cut is cut using the shearing force at the upper corner 19a of the punch 19 and the lower corner 14c of the core 14b. A cutting portion 22 that can be cut is formed.
[0017]
In a gap 17 between the punch guide 14a and the core portion 14b, a ribbon-shaped filter material 12a serving as a material of the filter portion 12 is inserted. The filter medium 12a is wound around a roll 23 on the filter medium supply side, and a used portion that has passed through the gap 17 is sequentially wound around a used filter medium winding roll 24. The filter medium 12 a is maintained in a tight state in the gap 17 by the tensile force of the two rolls 23 and 24. In addition, the rolls 23 and 24 constitute a filtration material supply device of the present invention.
[0018]
The movable mold 15 is provided with a vertically extending pin insertion hole 25 at the center thereof. The pin insertion hole 25 has a pin having a circular cross section for forming a center hole 11 a in the cylindrical body 11 of the filter 10. 26 are attached. The lower end portion of the pin 26 is located in the through hole 20 when the lower surface of the movable die 15 is in contact with the upper surface of the core portion 14b, and the inner peripheral surface of the through hole 20 and the pin 26 A cylindrical molding recess 27 is formed on the outer peripheral surface. As shown in FIG. 3, the position of the lower end of the pin 26 is smaller than the thickness of the filter medium 12a between the lower surface of the movable die 15 and the upper surface of the punch 19 when the lower surface of the movable die 15 is in contact with the upper surface of the core portion 14b. It is set so as to be a position where a slightly narrow gap 17a is formed.
[0019]
When manufacturing the filter 10 using the manufacturing apparatus 13 configured as described above, first, the tip of the filter medium 12a is pulled out from the roll 23, and the tip is placed between the punch guide 14a and the core 14b. And is engaged with the roll 24. Then, as shown in FIG. 2, the movable mold 15 is lowered, and the filter medium 12 a is lightly pressed against the punch 19 by the lower surface of the pin 26. The pressing of the filter medium 12a is for preventing the molding material from entering between the punch guide 14a and the core portion 14b during injection molding.
[0020]
Next, a molding material (liquid polypropylene) is injected from the injection hole 21 into the molding concave portion 27 formed by the through-hole portion 20 and the pin 26, and the cylindrical main body 11 is molded above the filtering material 12a. . As a result, as shown in FIGS. 2 and 3, the filtering material 12 a is attached to the lower end opening of the cylindrical main body 11, and the flange-shaped burrs 11 a are filtered on the outer peripheral side of the lower end of the cylindrical main body 11. It is formed in a state of being entangled with the material 12a. In this case, the width of the burrs 11a can be adjusted by the injection pressure at the time of injecting the molding material into the molding concave portion 27, and the width required for cutting the burrs 11a at the cutting portion 22 can be secured. Set the range so that it does not become too large.
[0021]
Then, as shown in FIG. 4, the movable die 15 is raised, and the pin 26 is pulled out from the cylindrical main body 11 formed in the concave portion 27 for forming. Then, the punch 19 is raised and the cylindrical main body 11 is The filter 10 composed of the filtering part 12 is pushed upward from the through hole 20 of the core part 14b. At this time, the boundary between the cylindrical body 11 and the burrs 11a is cut by a cutting portion 22 composed of an upper corner portion 19a of the punch 19 and a lower corner portion 14c of the core portion 14b, as shown in FIG. The burrs 11a remain in the gaps 17 together with the filtering material 12a, and the filtering material 12a located at the opening of the cylindrical main body 11 is integrated with the cylindrical main body 11 to form the filtering section 12. As a result, the filter 10 including the cylindrical main body 11 and the filtration unit 12 is obtained.
[0022]
In the above case, if only the filtering material 12a is cut by the cutting portion 22 without providing the burrs 11a, the filtering material 12a is a thin and smooth material, so that it becomes slippery and cutting failure easily occurs. For example, if the filter 10 is taken out in a state where the line between the filter unit 12 of the filter 10 and the filter medium 12a of the gap 17 is connected due to poor cutting, the filter medium 12a of the gap 17 is pulled by the same line. And lead to electric lines. As a result, problems such as damage to the unused filter medium 12a and the necessity of stopping the manufacturing apparatus 13 to perform a repair work arise.
[0023]
However, by providing the burrs 11a, the filter medium 12a with which the burrs 11a are entangled can be easily and accurately cut and removed from the filter 10. This is because, for example, when cutting a vinyl sheet with scissors, it is difficult to cut by slipping, but when cutting with the both sides of the vinyl sheet sandwiched by paper, the thickness increases and it becomes difficult to cut, so that it can be easily cut with scissors For the same reasons as
[0024]
After removing the filter 10 from the manufacturing apparatus 13, the punch 19 is lowered to align the upper surface with the upper surface of the punch guide 14a. Then, the used filter medium 12 a is wound up by rotating the roll 24, and the unused filter medium 12 a is pulled out from the roll 23 so that the unused portion of the filter medium 12 a is positioned on the upper surface of the punch 19. In this state, the movable mold 15 is lowered to lightly press the filter medium 12 a with the lower surface of the pin 26.
[0025]
Note that, as described above, when the filter medium 12a is moved in the gap 17, the core portion 14b is slightly raised to make the interval of the gap 17 wider than that in the injection molding. Thereby, the burrs 11a remaining on the filter medium 12a side can smoothly move without being caught between the punch guide 14a and the core portion 14b. Then, by repeating the above operation, a new filter 10 can be manufactured continuously.
[0026]
As described above, in the manufacturing apparatus 13 according to the present embodiment, the clearance 17 for forming a burr is provided on the outer peripheral side of the lower end portion of the concave portion 27 for molding, and the outer peripheral side of the lower end portion of the filter 10 To form a flange-shaped burr 11a in which a filter medium 12a is wound. The cutting portion 22 is formed by the upper corner portion 19a of the punch 19 and the lower corner portion 14c of the core portion 14b, and the burrs 11a are cut and removed from the filter 10 together with the filtering material 12a.
[0027]
For this reason, when pushing out the filter 10 from the through-hole part 20 with the punch 19, the burr 11a can be cut | disconnected from the filter 10 with the filter material 12a, and the cutting of the filter material 12a can be made easy and the cutting defect is eliminated. Further, by supplying the ribbon-shaped filter medium 12a to the upper surface of the punch 19 in a tensioned state, the filter medium 12a can be supplied to an appropriate position without being biased. Further, even during the injection molding, no displacement occurs in the filtering material 12a, so that there is no occurrence of defective products due to the displacement of the filtering material 12a.
[0028]
As described above, since the number of defective products is drastically reduced, it is not necessary to inspect all of the manufactured filters 10, and the inspection process can be simplified. In addition, since the filter medium 12a can be continuously supplied, the filter 10 can be efficiently manufactured, and mass production is possible.
[0029]
In the manufacturing apparatus 13 according to the embodiment, the fixed mold 14 is arranged on the lower side, and the movable mold 15 is arranged on the upper side. However, the present invention is not limited to this, and the apparatus may be a horizontal apparatus, and the fixed mold 14 and the movable mold 15 may be upside down. Further, the manufacturing apparatus 13 is not limited to the use of only one apparatus, and a plurality of apparatuses can be arranged in parallel.
[0030]
In this case, a plurality of manufacturing apparatuses 13 provided with the rolls 23 and 24 may be arranged in parallel, or a plurality of manufacturing apparatuses 13 may be arranged between a pair of rolls 23 and 24. Further, in the above-described embodiment, the gap is provided between the opposing surfaces of the punch guide 14a and the core portion 14b. However, the opposing surfaces are in contact with each other, and the concave portions are formed so that the molding material flows only in the flash forming portion. May be formed.
[0031]
Furthermore, when a plurality of manufacturing apparatuses 13 are arranged in parallel between a pair of rolls 23 and 24, the filter medium 12a can be used without waste by setting the installation intervals to appropriate intervals. , Which can lead to a reduction in material costs. Further, in the above embodiment, the filter 10 is used for a medical device, but the filter manufactured by the present invention is not limited to this, and any filter for filtering a liquid or a gas can be used. A filter used for any purpose may be used. For example, it is a fuel filter or an air filter. Also, the shape and size of the filter can be changed as appropriate.
[0032]
Further, in the filter 10 according to the above embodiment, polypropylene is used for the cylindrical main body 11 and polyethylene is used for the filtration unit 12, but other resins can be used as these materials. However, in this case, at the time of injection molding of the cylindrical main body 11, a material having an affinity such that the cylindrical main body 11 and the filtering section 12 are integrated is selected and used. Further, the shape of the filter 10 is not limited to a cylindrical shape, but may be a square tubular shape, a triangular tubular shape, an elliptical tubular shape, or the like.
[Brief description of the drawings]
FIG. 1 is a perspective view illustrating a filter manufactured by a manufacturing apparatus according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view showing a state in which a mold in a manufacturing apparatus is closed.
FIG. 3 is an enlarged sectional view of a main part of FIG. 2;
FIG. 4 is a longitudinal sectional view showing a state where a mold in the manufacturing apparatus is opened.
FIG. 5 is a perspective view showing a state in which a filter is separated from a filter medium.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Filter, 11 ... Cylindrical body, 12 ... Filter part, 12a ... Filter material, 13 ... Manufacturing equipment, 14 ... Fixed type, 14a ... Punch guide, 14b ... Core part, 14c ... Bottom corner part, 15 ... Movable type , 16: mold, 17, 17a: gap, 19: punch, 19a: upper end corner, 20: through hole, 22: cut, 23, 24: roll, 26: pin, 27: forming recess.

Claims (5)

A mold including a fixed mold and a movable mold that can move forward and backward with respect to the fixed mold,
A columnar recess provided on one of the fixed mold and the movable mold, and having one end opened on a divided surface of the fixed mold and the movable mold,
A pin that is provided on the other of the fixed mold and the movable mold and forms a cylindrical molding recess in the mold by being inserted into the columnar recess,
An extruding section for extruding a filter molded in the molding recess from the molding recess, and a mesh-shaped filter medium is installed at the other end of the molding recess. By injecting the material, a filter manufacturing apparatus for manufacturing a filter configured by sticking a filter material to the other end opening of the cylindrical body,
A space for forming a burr is provided on the outer peripheral side of the other end of the molding recess in the mold, and a burr cutting is performed at the tip of the extruded portion and the wall of the molding recess where the extruded portion slides. An apparatus for producing a filter, wherein a cutting portion for use is formed. 2. The filter medium supply device according to claim 1, wherein the filter medium is formed of a ribbon-shaped long body, and a filter medium supply device that continuously supplies the filter medium to a gap provided in the mold in a state where the filter medium is tensioned is provided. Filter manufacturing equipment. A filter manufacturing method for manufacturing a filter configured by attaching a net-like filter material to one opening of a cylindrical main body,
A step of supplying a ribbon-shaped filter medium in tension at the end of the cylindrical molding recess provided in the mold,
Injection molding a cylindrical body, and a beam integrally formed on the outer peripheral side portion of the end of the cylindrical body and entangled with the filter medium;
A step of cutting and removing the burrs formed on the outer peripheral side of the end of the tubular main body together with the filter material. The molding of the cylindrical body and the flash is performed by injecting a molding material into a molding recess provided in a mold and a flash forming gap provided on an outer peripheral side of an end of the molding recess. The method for producing a filter according to claim 3, which is performed. Cutting and removing the burrs formed at the outer peripheral portion of the end portion of the tubular body and the filter entangled with the burrs are performed by forming a filter comprising the tubular body and the filter material formed in the forming recess into the filter. When the filter is extruded from the molding recess by a cutting portion using a shearing force formed by the tip of the extrusion portion for extruding from the recess and the wall of the molding recess to which the extrusion portion slides. The method for producing a filter according to claim 3 or 4, wherein

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