JP2002028953A - Die for mesh filter, and its molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly spread a molten material to the whole of a die, and avoid the influence of a gas or air which is generated in the die. SOLUTION: This die is constituted of a mesh groove 2, guide band grooves 5, linear partitioning guide band grooves 6, a frame body groove 1, and a gate. (a) The mesh groove 2 which is formed into a stripe shape or a grille shape in such a manner that respective mesh grooves of an upper die and a lower die may be confronted with each other is respectively formed on the upper die and the lower die. (b) The guide band grooves 5 are formed on the mesh groove 2 of the upper die and/or the lower die, and do not directly communicate with the frame body groove 1. (c) A plurality of the guide band grooves 5 are arranged on the mesh groove 2 of the upper die and/or the lower die in a manner to be symmetrical with the upper die and/or the lower die. (d) The linear partitioning guide band grooves 6 are arranged on the upper die and/or the lower die in a manner to partition the guide band grooves 5. (e) The frame body groove 1 is formed on the upper die and/or the lower die in a manner to surround the mesh groove 2, the guide band grooves 5 and the partitioning guide band grooves 6. (f) The gate is provided on the upper die or the lower die to inject the molten material into the dies.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention can be naturally applied to various filters such as oil or air filters for automobiles and electronic equipment, and filters for daily miscellaneous goods including kitchenware and water-related products. The present invention relates to a mold for a mesh filter suitable for use in a large integral filter such as a screen door.

[0002]

2. Description of the Related Art Conventionally, it has been common practice to perform insert molding instead of integral molding of a mesh filter or a thin plate-like molded product having such a seed frame portion due to difficulty in molding. However, the cost of the insert molding is increased due to the increase in man-hours, and furthermore, it is important to match the frame portion with the mesh. For this purpose, a skilled worker and expensive positioning devices and welding devices are required. Among them, there has been an attempt of integral molding, but has the following disadvantages. (1) If the molten plastic material is injected at a low injection pressure, the material does not reach the end and a part of the mesh ribs and thin plates are removed or chipped away from the gate. (2) If the injection pressure is set to a high pressure, the mesh ribs can be easily removed and a part of the thin plate can be improved, but in order to achieve this, the apparatus must be increased in size. Burrs are obstructed and do not function as a filter or a net. In order to reduce burrs as much as possible, it is difficult to adjust pressure in the manufacturing process. The above disadvantages have already been overcome by the applicant's guiding band technology. The induction zone technology is used for injection molding.
The molten material flowing in from the gate is press-fitted into a thin mesh groove communicating with it after storing a certain pressure in the guiding band groove having a diameter larger than the mesh groove, so that the molten material works to flow to the end of the mesh groove,
This enables the formation of a fine mesh filter by low-pressure molding. However, trying to obtain a large filter even with the induction band technology has the following additional disadvantages. (3) With the induction band technology, a filter with an area of about 100 mm square can be formed without any problem. However, in the case of a filter with about 300 mm square, it is necessary to force the molten material into a very narrow mesh groove. , So that it stays in the gas or air mold generated from the hot molten material,
Even if the injection pressure is increased, there is a drawback that the molten material cannot reach the end of the narrow groove. (4) If the injection pressure is forcibly increased in order to prevent the ribs from coming off at the end, there is a drawback that burrs are generated this time and the filter cannot function as a filter. As prior art, there are plastic colanders and garbage pans for kitchen drains, all of which are simply a combination of thick and wide grooves and thin mesh grooves, and are made of molten material. The flow was poor and a large mesh filter could not be formed. In addition, the molding efficiency or the molding ability was low, and it was of such a degree that it could not be applied to fine mesh products having a mesh and a mesh yarn width of less than 1 mm.

[0003]

Problems to be solved by the present invention There are the following problems in molding a product having a small pitch and a large mesh structure by injection molding, for example, a filter or a screen for an air conditioner. (1) A mold structure that does not generate much gas or air in the mold is required. (2) A mold structure for uniformly distributing the molten material over the entire mold is required. (3) It is necessary to have a mold structure that enhances the fluidity of the molten material, and that does not easily cause ribs to slip off in portions where the molten material is hard to rotate and sink marks in thick portions. (4) Since gas or air is always generated in the forming die, it is necessary to perform molding with only one die in order to avoid the influence. For multiple nested combinations,
The gap is changed by gas or air, so that the maintenance of the mold is very troublesome. Therefore, the present invention is to solve the drawbacks of the conventional injection molding by means described below.

[0004]

Means for Solving the Problems The mold of the present invention has the following features. According to claim 1, in a mold apparatus for forming a mesh filter molded article with a frame by pressing an upper mold and a lower mold and injecting a molten material through a gate, the mold apparatus has the following configuration. Die for mesh filter. (A) a mesh groove formed in each of the upper mold and the lower mold in a stripe shape or a lattice shape, and formed such that respective mesh grooves of the upper mold and the lower mold face each other; (b) an upper mold and / or Or a guide band groove formed on the lower mold groove and not directly communicating with the frame groove. (C) A plurality of guide band grooves arranged symmetrically to the upper mold and / or lower mold on the upper mold and / or lower mold grooves. (D) A substantially linear partitioning guide arranged on the upper mold and / or the lower mold in such a manner as to partition a plurality of guide band grooves formed on the upper and / or lower mesh grooves. Gutter (e) To surround the net gutter, guide gutter, partition guide gutter,
Frame groove formed in the upper mold and / or lower mold (f) A gate provided in the upper mold or the lower mold for injecting the molten material into the mold.
In addition, providing at least one or more flow path grooves formed on the upper and / or lower mold net grooves, having a diameter larger or wider than the mesh grooves, and smaller or narrower than the guide band grooves. Features. According to a third aspect of the present invention, in addition to the first aspect, a band groove having a larger diameter than the mesh groove is provided so as to be orthogonal to a part of the partition guiding band groove. According to a fourth aspect of the present invention, in addition to the first aspect, the partition guiding band groove is provided by being divided into at least two or more. According to a fifth aspect of the present invention, a molded product of a mesh filter is obtained by using the metal mesh for the mesh filter according to any one of the eleventh to fourth aspects.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is a plan view of an upper mold of a metal mold for a plastic filter according to the present invention, in which a mesh groove 2 which is a narrow groove only in a lateral direction and a frame groove 1 surrounding it are formed. Have been. The molten material in the present invention will be described by using a plastic resin, but may be a mixed material with paper or the like as long as it is a molten material. On the mesh groove 2 constituting the filter, a large-diameter flow path groove 3 for promoting the flow of the molten material is formed substantially vertically and horizontally as a plurality of grooves. Although not shown, the lower die is also provided with a net groove 2 only in the lateral direction, a frame groove 1 surrounding the same, and a flow path groove 3 like the upper die. However, depending on the shape of the molded product, other grooves need not be provided in the lower die except for the net groove 2. Since the mesh grooves 2 are formed in only one direction by the horizontal mesh grooves 7, the flow of the molten material stings in the mold does not collide with the narrow grooves, and the flowability is extremely improved. At the same time, the groove cut with a taper in the vertical direction forms a diamond-shaped or circular-shaped net groove 2 by the upper and lower die net grooves 2, so that its spatial volume is very large, and The central portion of the groove 2 has a bulge, which is a groove shape suitable for a circular inner skin formed during or after the flow of the molten material. Furthermore, since the one-way mesh grooves 2 are formed symmetrically in the upper mold and the lower mold and pressed together, the flow of the molten material in the mold does not collide with the narrow grooves. Becomes much smoother. As a result, a large-area molded product or a fine-mesh-shaped molded product can be molded in a large amount with a high yield while having a low injection pressure. In experiments conducted by the present applicant, an injection pressure of 100 Kg or more was required when a grid filter having a 200- or 110-angle grid was generally used.
Molding can be easily performed even at around 0 kg, and what normally required a mold clamping force of about 200 tons can be easily performed with a small mold clamping force of less than 100 tons. Further, since grooves are pressed in only one direction, the mold release is very good, unlike the lattice-like grooves, so that the number of shots can be increased, and a molded product having a fine mesh can be formed in a short molding time. Therefore,
A sufficiently large filter can be obtained with a striped mesh filter formed by the above-mentioned mold. However, this is not to say that a lattice-shaped mesh filter is unsuitable. Depending on the shape of the filter or the thickness of the mesh, a lattice-shaped mesh filter may be more advantageous. In particular, for a filter that requires strength, a grid-like mesh filter is essential. However, even with the above technique, 300 mm
In the case of making a large filter such as a corner, although very slight, a phenomenon of rib detachment occurs, and when the injection pressure is increased to eliminate the phenomenon, burrs are generated. In view of the above, the present invention aims to eliminate the drawbacks by improving the mold described above and further adding a guide band groove and devising the arrangement thereof. The guiding band groove 5 having a substantially cross shape and a large diameter is arranged on the net groove 2, and a gate is provided at the center of the guiding band 5 having the cross shape. The leading end of the guiding band 5 extends in the direction of the frame groove 1, but is not directly connected to the frame groove 1. Therefore, when the molten material is injected from the gate at the center of the guiding band groove 5, the molten material flows into the net groove 2. At this time, since the leading end of the guiding band groove 5 is closed, the guiding band groove 5 has a function of temporarily accumulating the injected molten material. When the injection of the molten resin continues, the molten material cannot be withstand the pressure, and the molten material is forced into the net groove 2 with a strong force.
It works to release to. As a result, the molten material flows so as to fill the net groove 2 preferentially without intensively flowing into the frame groove 1. By providing a plurality of guiding band grooves 5 having such a function in accordance with the size of the filter, the size of the filter can be increased. The number, such as two, four, six or eight, varies depending on the filter shape. However, a simple mesh filter cannot be formed simply by increasing the number of the guiding band grooves 5. In particular, the larger the size, the more difficult it becomes.
This is because there is an element which cannot be solved simply by matching in forming on a mesh. Explaining the case where four guide band grooves are provided, even if there are a plurality of guide bands, the adjoining portion has a shape in which only the front ends are opposed to each other. Is weak and the amount of the molten material that flows in is small. Therefore, as means for increasing the inflow amount and increasing the pressure, a guide band groove is further provided at a portion where the guide band groove 5 is opposed. That is, a substantially linear partitioning guide groove 6 is provided between the plurality of guiding band grooves 5 like a partition. The partition guide groove 6 serves as a means for increasing the amount of inflow of the inflowing molten material and increasing the pressure. This is because, similarly to the guide band groove 5, the partition guide band groove 6 is not directly connected to the frame body groove 1 and therefore acts as a pressure accumulating means for the molten material. Since the arrangement is also symmetrical, the inflow of the molten material spreads over the entire net groove 2 without being biased in a specific direction. This partition guiding band groove 5 is the greatest feature of the present invention. At this time, the flow of the molten material is further improved by additionally providing the flow path groove 3. Flow channel groove 3 in FIG.
Has a shape which does not directly communicate with the frame groove 1 in order to have a pressure accumulating effect slightly like the guiding band groove 5. The number may be small because it has a strong effect on the flow of the molten material. The number can be arbitrarily changed according to the size, shape, and mesh pitch of the filter.

FIG. 2 shows a configuration in which the number of flow path grooves 3 is larger than that of the embodiment shown in FIG. 1 and is in direct communication with the frame groove 1. Thereby, the strength of the mesh formed by the horizontal mesh grooves 7 can be secured. A large number of flow path grooves 3 and a frame body groove 1
This is the effect of the direct connection. The effect of the lattice filter and the high aperture ratio of the stripe filter can be realized. The guide groove 5 and the partition guide groove 6 are the same as those in FIG.
Therefore, the molten material flows preferentially to fill the net groove 2 without intensively flowing, and the inflow of the molten material spreads over the entire net groove 2 without being biased in a specific direction.

FIG. 3 shows another embodiment, in which the basic structure of the mold is the same as that of FIG. 1, except that the diameter or width of the partition guiding band groove 6 is About the same,
The length has a short band groove 4. The presence of the band groove 3 combined with the effect of accumulating / discharging the molten material in the guiding band groove 5 and the partitioning guiding band 6 further makes the filling of the molten material into the mold smoother. As a result, there is also an effect that the ribs of the mesh filter are completely eliminated and the number of molding shots is increased to enable mass production. Although not shown, the band groove 4 may be provided symmetrically at both end sides of the partition guide band groove 6, or may be provided not at the tip but at the end which is the direction of the center of the filter.
In any case, a certain degree of deformation is possible as long as the arrangement of the entire filter including the guide band groove 5 and the partition guide band groove 6 is not unbalanced. FIG. 7 and FIG. 8 show one of the modifications. In the case of FIG.
And a band groove 4 is provided in the second embodiment. Since the plurality of guide band grooves 5 are arranged obliquely with respect to the rectangular shape of the frame body groove 1, the space formed at the leading end of each guide band groove 5 is poorly filled with the molten material. Therefore, the band body groove 4 is provided so as to be orthogonal to a part of the partition guide band groove 6 to reinforce the portion where the filling power is weak. FIG. 8 shows a case in which the band groove 4 is provided from the corner toward the center in order to reinforce the corner portion of the frame groove 1 in which the rib is likely to come off.

FIG. 4 shows a configuration in which the partition guide band grooves 6 are arranged diagonally to the frame body groove 1. This shape is effective in preventing the rib from coming off easily at the corner of the frame groove 1. Since the partition guide groove 6 is arranged diagonally to the frame body groove 1, the shape of the guide groove 5 needs to be slightly changed. Although the corner portions of the frame groove 1 are easily filled by the partitioning guide groove 6, the inflow of the molten material is weakened in the portion of the mesh groove 2 which is close to and parallel to the four sides of the frame groove 1, and there is a possibility that the rib may come off. Got higher. By arranging them on a diagonal line, as a result, the guiding band groove 5 acts sufficiently only at the corner portion, but the acting force is weakened when the guiding band groove 5 approaches the four sides of the frame body groove 1 in parallel. Therefore, in such a case, the band groove 4 in the embodiment of FIG.
This contributes enough to prevent ribs from coming off. It is also desirable that the portion is disposed in a portion adjacent to the four sides of the frame groove 1 in parallel. In the present embodiment, the guide groove 5 is a single linear guide groove. In combination with the band groove 4, the same effect as that of the substantially cross-shaped guiding band groove can be obtained.

FIG. 5 has the same basic mold structure as that of FIG. 1, but is characterized in that a partition guide band groove 6 is provided between the guide band groove 5 and the frame body groove 1. Normal partition guide band groove 6
Are provided between each of the four guide band grooves 5 formed on the mesh groove 2, and are further added to the frame groove 1.
It is arranged between and. In the injection molding, the flow of the molten material tends to flow to a portion having a large volume as a characteristic of the flow of the molten material.
Trying to flow to. In this case, the molten material is used up in the frame groove 1 and the mesh material 2 may not be completely filled with the molten material. In order to prevent this, a partition guide band groove 6 is provided so as to block the path to the frame groove, which is likely to flow. The molten material flowing into the frame groove 1 from the leading end of each guiding band groove 5 is cut off by the partitioning guiding band groove 6, and the pressure accumulating / discharging action in the partitioning guiding band groove 6 causes the surrounding material to melt. After the mesh groove 2 is completely filled, the molten material flows into the frame groove 1. This results in a molding die having a higher yield. FIG.
In the embodiment, the partitioning guide grooves 6 are provided so as to face the leading end portions of the respective guiding band grooves 5. However, the partitioning guide groove portions between the guiding band grooves 5 are opposed to the leading end portions of the partition guiding band grooves 6. 6
May be provided.

FIG. 6 shows a net-like groove 2 having a stripe shape,
This shows an example of a mold for obtaining a lattice filter using the lattice net grooves 9. The basic structure of the mold is substantially the same as that of FIG. 1 except that the net grooves 2 are formed in a grid pattern by horizontal net grooves 7 and vertical net grooves 8. When actually formed using the lattice net grooves 9, the lattice net grooves 9 running in the vertical and horizontal directions have a drawback that a collision between the molten materials occurs and a smooth flow is difficult to occur, and the molding is difficult. However, it is more advantageous than a striped filter in terms of strength. Therefore, in order to minimize the collision between the molten materials, the flow path grooves 3
Is eliminated, and only the basic structure of the guiding band groove 5 and the partitioning guiding band groove 6 is left without other band such as the band body groove 4.

FIG. 9 shows a modified example of each guiding band groove 5, which is particularly effective in the case of a stripe-shaped net groove 2. As shown in FIG. The horizontal net groove 7 is a groove only in the horizontal direction. Of the cross-shaped guiding band grooves 5, the horizontal guiding band groove is arranged in parallel with the horizontal net groove 7, so that the effect of pressure accumulation / release tends to be slightly weakened. It is in.
Therefore, the guide groove perpendicular to the horizontal mesh groove 7 has a normal length, but the guide groove parallel to the horizontal mesh groove 7 is connected to the two guide band grooves 5 to be longer, so that the pressure accumulation / release can be performed. It is intended to enhance the action. At this time, the connected guiding band groove passes through the partition guiding band groove 6, but ideally, the action of accumulating / discharging increases when the guiding guiding groove does not intersect with the partition guiding band groove 6. Is divided into two portions, and the guiding band groove passes between them. As a modified example, as shown in FIG. 10, the partition guide groove 6 and the guide band groove 5 may be combined to form a shape in which the connected guide groove is orthogonal to the partition guide groove 6 which is not divided. Even with this shape, the plurality of guide bands 5 and the partition guide bands 6 do not lose their original function and effect.

FIG. 11 shows a grid-like net groove 9 composed of a horizontal net groove 7 and a vertical net groove 8 provided with a divided partition guide band groove 6. As a result of the division, each of the partitioning guide grooves 6 exerts the effect of accumulating / discharging independently of each other, so that the effect is increased. The guide slot is as short as possible,
In addition, since there is a tendency that it is more advantageous to have a large number of these, this type of modification is also effective. Although not shown, the same effect can be obtained even in a stripe-shaped net groove. With the above-described mold of the present invention, it is possible to obtain a fine and large-sized mesh filter which has heretofore been impossible. Furthermore, the same material and integral molding make it suitable for reuse, which is consistent with recent recycling concepts.

[0013]

The effects of the present invention will be described with reference to the claims. (Claim 1) By providing a plurality of guide bands 5, the function of accumulating / discharging is enhanced, and by providing the partition guide bands 6, a large mesh filter of 300 mm square or more can be obtained. Further, since the partitioning guide groove 6 is provided between the guide groove 5 and the frame groove 1 so that the molten material does not flow into the frame groove 1 preferentially, injection from the gate on the guide band groove 5 is performed. The melted material that has flowed into the net groove 2 cannot flow immediately into the wide frame groove that is normally easy to flow, and flows first toward the net groove 2, so that the mesh is reliably formed. As a result, there is an extremely great effect that a large-area molded product or a fine-mesh-shaped molded product can be molded in large quantities with high yield. Further, as a modified example, the shape in which the partition guide band grooves 6 are arranged diagonally with respect to the frame body groove 1 is effective in preventing the ribs coming off easily at the corners of the frame body groove 1. (Claim 2) In addition to the effect of claim 1, by providing a flow path groove 3 on the mesh groove 2 for assisting the flow of the molten material, the effect of uniform mesh formation is exhibited, and the filter strength is further improved. Effective for improvement. In particular, the effect is greater in a striped mesh filter. (Claim 3) In addition to the effect of the first aspect, the provision of the band groove 3 is combined with the effect of accumulating / discharging the molten material in the guiding band groove 5 and the partitioning guiding band 6, and further, the gold of the molten material is provided. Filling in the mold becomes smoother. As a result, there is an effect that the ribs of the mesh filter are completely eliminated and the number of molding shots is increased to enable mass production. (Claim 4) In addition to the effect of the first aspect, a divided partition guide groove 6 is provided, and each partition guide groove 6 independently exerts the effect of accumulating / discharging.
Even in a large-sized mesh filter, it is effective in forming a uniform mesh without ribs.

[Brief description of the drawings]

FIG. 1 is a plan view of a molding die of the present invention.

FIG. 2 is a plan view of another embodiment of the molding die of the present invention.

FIG. 3 is a plan view of another embodiment of the molding die of the present invention.

FIG. 4 is a plan view of another embodiment of the molding die of the present invention.

FIG. 5 is a plan view of another embodiment of the molding die of the present invention.

FIG. 6 is a plan view of a molding die of the present invention applied to a lattice network filter.

FIG. 7 is a plan view of another embodiment of the molding die of the present invention.

FIG. 8 is a plan view of another embodiment of the molding die of the present invention.

FIG. 9 is a plan view of another embodiment of the molding die of the present invention.

FIG. 10 is a plan view of another embodiment of the molding die of the present invention.

FIG. 11 is a plan view of another embodiment of the molding die of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame groove 2 Net groove 3 Flow path groove 4 Band groove 5 Guide band 6 Partition guide band 7 Horizontal net groove 8 Vertical net groove 9 Lattice net groove

Claims (5)

[Claims] 1. A mold apparatus for forming a mesh filter molded product with a frame by pressing an upper mold and a lower mold and injecting a molten material through a gate, characterized by having the following configuration. Die for mesh filter. (A) a mesh groove formed in each of the upper mold and the lower mold in a stripe shape or a lattice shape, and formed such that respective mesh grooves of the upper mold and the lower mold face each other; (b) an upper mold and / or Or a guide band groove formed on the lower mold groove and not directly communicating with the frame groove. (C) A plurality of guide band grooves arranged symmetrically to the upper mold and / or lower mold on the upper mold and / or lower mold grooves. (D) A substantially linear partitioning guide arranged on the upper mold and / or the lower mold in such a manner as to partition a plurality of guide band grooves formed on the upper and / or lower mesh grooves. Gutter (e) To surround the net gutter, guide gutter, partition guide gutter,
Frame groove formed in upper and / or lower mold (f) Gate provided in upper or lower mold to inject molten material into mold 2. The method according to claim 1, wherein the upper mold and / or
Or at least one or more is formed on the lower mesh groove, the diameter or width is larger than the mesh groove, and a mesh for a metal filter characterized by providing a flow path groove smaller in diameter or narrower than the guide band groove. . 3. The mesh filter mold according to claim 1, wherein a band groove having a diameter larger than that of the mesh groove is provided so as to be orthogonal to a part of the partition guide band groove. 4. The mesh for a mesh filter according to claim 1, wherein the partition guide groove is divided into at least two or more portions. 5. A molded product obtained by using the mold for a mesh filter according to claim 1.