JP4065762B2 - Cell type filter cartridge - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
This invention relates to cell Le type filter cartridge outer peripheral portion by thermal contraction to prevent the distortion in a wave by spacer hot water.
[0002]
[Prior art]
The cell type filter cartridge is sandwiched between a filter paper and a disc-shaped filter material (hereinafter also referred to as a filter sheet ) made of a filter paper or a baked filter material, and the outer peripheral edges of the upper and lower filter sheets are made of a thermoplastic resin. A cell having a structure insert-molded with a ring is laminated in multiple stages.
[0003]
Such a filter cartridge is often used in a manufacturing process in the food field, and in the manufacturing process, heat treatment such as hot water flow is performed for sterilization cleaning. Recently, it has been found that this heat treatment causes the spacers to deform, thereby damaging the upper and lower filter sheets.
[0004]
Conventionally, since the integrity test method for depth filters has not been known, it has not been found that the upper and lower filter sheets are damaged by heat treatment. This is because the damage is very fine, and damage that cannot be seen with the naked eye does not occur.
[0005]
Recently, it was discovered that a completeness test method for depth filters was developed. However, when a spacer made of thermoplastic resin is sandwiched between filter sheets via a non-woven fabric, the non-woven fabric can be used even if the spacer is deformed. Since it becomes an interference material, the filter sheet is hardly damaged. It has been found that such a problem occurs when the nonwoven fabric is omitted for the purpose of cost reduction.
[0006]
As a result of earnest research on the cause of such damage, it was found that the damage was caused as follows. First, when the thermoplastic resin ring of the filter cartridge is thermally contracted by heat treatment and the cell is deformed into a bowl shape, the outer periphery of the spacer is sandwiched between the cells, so that it is distorted and deformed into a wave shape. When the spacer outer peripheral portion is deformed in a wave shape in this way, the filter sheet is deformed in a wave shape like the spacer due to the pressure during water flow, and the filter sheet is damaged.
[0007]
[Problems to be solved by the invention]
The present invention has been made in order to solve such a problem, even if the hot water through the water so as not to deform in a wave is distorted spacer cell Le type filter that prevents damage to the filter sheet An object is to provide a cartridge.
[0008]
[Means for Solving the Problems]
The invention according to the first aspect of the present invention that meets the above-described object is that the spacer made of thermoplastic resin is sandwiched between the upper and lower disk-shaped filter media, and the outer peripheral edges of both disk-shaped filter media are sealed with a ring made of thermoplastic resin. In the cell type filter cartridge, a plurality of ribs are continuously provided radially on the outer periphery of the ring-shaped rib, and the radially leading rib ends are connected by ring-shaped ribs, and adjacent to the radially-connected ribs. It is characterized by using a spacer in which a plurality of spaced portions where the provided ribs are separated from each other are formed, and the radially formed ribs can be deformed as a plurality of groups.
[0009]
It is particularly preferable to form one or more sets of the spaced-apart portions so as to face each other (Claim 2 ). The filter medium is a filter paper or a baked filter medium, and the filter cartridge configured so that the filter medium and the spacer can be in direct contact particularly exerts the effect of the present invention (claim 3).
[0010]
In summary the present invention, when the cell is deformed bowl shape, such a spacer is not distorted in a wave shape, as the rib is formed radially of the spacer, so adapt to the deformation of the cell, but may be modified as a group of several The gist of this is that
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0012]
1 to 4 show an embodiment of the present invention . A large number of linear long ribs 3 are radially connected to a ring-shaped strip-shaped rib 2, and the tip of the long rib 3 has a ring shape. An example is shown in which it is integrally formed of thermoplastic resin (polypropylene) so as to be connected by ribs 4 and to form four adjacent rib spacing portions 5 at equal intervals.
[0013]
As shown in FIG. 3, the ring-shaped rib 2 and the ring-shaped rib 4 are formed in a ring-shaped strip shape, and a ring-shaped strip-shaped rib 6 is formed in the middle thereof. The ring-shaped rib 4 is connected by a large number of straight short ribs 7. A large number of ring-shaped round ribs 8 are formed between the ring-shaped rib 2 and the ring-shaped strip-shaped rib 6 and between the ring-shaped strip-shaped rib 6 and the ring-shaped rib 4.
[0014]
As shown in FIG. 4, the long ribs 3, 3 facing each other at the separating portion 5 and the long rib 3 and the short rib 7 are separated from each other, so that the four rib groups can be deformed independently. ing. In addition, as shown in FIG. 4, the corner | angular part R 'of the ring-shaped strip | belt-shaped rib 6 to which the rib front-end | tip R and the short rib 7 lower end which the space | interval part 5 opposes is connected is formed smoothly without a corner | angular part. . Even if the rib group modified Ru der to hardly damage the filtering material.
[0015]
The configuration and spacer as above SL, sandwiched by the upper and lower filter papers made of filter paper or sintered filtration material, when injection molding the outer peripheral portion of a thermoplastic resin ring, be a cell-type filter cartridge of the present invention it can. In addition, it is preferable to use the filter paper containing diatomaceous earth and a pulp as a baked filter material.
[0016]
Next, the thermal deformation test result of the spacer of the present invention configured as described above will be shown.
[0017]
A spacer 1 made of polypropylene shown in FIG. 1 was sandwiched between filter papers for disk filter made of diatomaceous earth and pulp, and a filter cell was formed by injection molding into a disk cell shape having a diameter of 300 mm by a conventional method. The cells were connected and integrated in the 16-cell longitudinal direction to obtain a 16-cell cartridge (product of the present invention).
[0018]
For comparison, a conventional 16-cell cartridge (comparative product) was prepared in the same manner as described above by using a spacer configured in the same manner except that the separation portion 5 was not formed.
[0019]
Next, after the 16-cell cartridge of the present invention and the comparative product were set in the filter housing, normal temperature water at 20 ° C. was passed for 20 minutes at a flow rate of 10 liters / minute.
[0020]
The 16-cell cartridge was then placed in an autoclave and heated at 121 ° C. for 30 minutes. When the autoclave temperature in the autoclave reached 100 ° C. after the completion of heating, the autoclave was taken out immediately and immersed in cold water for rapid cooling. Then, the cartridge was disassembled and the thermal deformation was confirmed. The results were as shown in the exterior photo attached to the submitted property submission dated the same date as this document.
[0021]
As is apparent from the external appearance photograph, the conventional product (Photo 1 and Photo 3) was deformed into a corrugated wave shape after heat treatment, but the product of the present invention (Photo 2 and Photo 4) did not show any corrugated deformation. I couldn't. Although the above test was performed twice, Photo 1 and Photo 2, and Photo 3 and Photo 4 were comparatively tested at the same time.
[0022]
Photo 5 is the one before the heat treatment of the product of the present invention. As is apparent from Photo 2 and Photo 4, it can be seen that the product of the present invention is also transformed into a bowl shape by the heat treatment. That is, when the cell is deformed into a bowl shape, the spacer of the present invention is also deformed into a bowl shape in conformity with the deformation of the cell, so that it is not distorted into a wave shape like the comparative product.
[0023]
Although there was a concern that the notch (separation part 5) could cause the notch and the filter paper to interfere with each other and damage the filter paper, there was no problem at all as shown in Photo 6. Further, according to the integrity test, the filter sheet was found to be damaged when the conventional product was used, but the filter sheet was not damaged at all when the product of the present invention was used.
[0024]
According to the present invention, the formed ribs radially, so deformed as a group of several, even when passed through the hot water, because the outer peripheral portion is not distorted can be prevented from being deformed in a wave shape. As a result, breakage of the filter cell can be effectively prevented.
[0025]
【The invention's effect】
As described above, according to the present invention, since the integrity test has not been performed in the past, it is possible to effectively prevent the filter medium from being damaged due to the deformation of the spacer caused by hot water, which was not noticed at all. As a result, not only can proper filtration be performed, but also an accurate increase in differential pressure due to clogging can be confirmed, making it easy to grasp the filter cartridge replacement guidelines. The effect is effective.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA of FIG.
FIG. 3 is an enlarged view of a portion B in FIG.
4 is an enlarged view of a portion C in FIG. 1. FIG.
[Explanation of symbols]
1 ......... Spacer 2 ......... Ring-shaped rib 3 ......... Long rib 4 ......... Ring-shaped rib 5 ......... Separating part

Claims (3)

In a cell type filter cartridge in which a thermoplastic resin spacer is sandwiched between upper and lower disk-shaped filter media and the outer peripheral edges of both disk-shaped filter media are sealed with a thermoplastic resin ring, a large number of the spacers are provided on the outer periphery of the ring-shaped rib. The radial ribs are continuously provided, and the radially leading rib tip portions are connected by ring-shaped ribs, and a plurality of spaced apart portions are provided to separate the adjacent radially connected ribs. The cell-type filter cartridge is characterized in that the ribs formed on can be deformed as a plurality of groups. The separation portion, opposite to the one set, one or more pairs formed comprising Claim 1 cell type filter cartridge according. The filter cartridge according to claim 1 or 2 , wherein the filter medium is filter paper or a baked filter medium, and the filter medium and the spacer are configured to be in direct contact with each other .

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