JPH0137691Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a core for cartridge material.

Prior Art and Problems In recent years, cartridge-type materials have been widely used. Attempts have been made to increase the number of pleats in the cartridge section in order to make the cartridge profile smaller and increase the area. As a result, it becomes easier to deform in response to external pressure. For this reason, a perforated cylinder is generally inserted into the central cavity of the cartridge to prevent the cartridge from deforming. however,
When this perforated cylinder is made of plastic, the cylinder itself deforms when it passes through hot liquid. Particularly during the manufacture of semiconductor integrated circuits, there is a demand for filters with good chemical resistance that do not elute metals, and filters made entirely of fluorine resin have come to be used.However, conventional cartridge filters using fluorine resin cylinders are There were limits to its use at high temperatures and pressures.

One possibility is to make the cylinder thicker, but at high temperatures,
If the wall is thick enough to withstand high pressure, the overresistance will be large, which is impractical.

Means for Solving the Problems As shown in FIGS. 1 to 3, the present invention provides a round rod-shaped lid having a longitudinal groove 1 at least in the longitudinal direction and having a diameter that can be inserted into the central opening of the cartridge material. This invention relates to a core for cartridge material made of resin. FIG. 2 shows the core end in the liquid collection direction, and FIG. 3 shows the core end on the cartridge closing cap side.

Basically, the material core of the present invention may be any material as long as it is not eroded by the treatment liquid, has the strength necessary for reinforcement, and is workable. Thermoplastic resins such as polyethylene and polypropylene, which have good processability and excellent chemical resistance, may be used for normal use, but when high-quality manufacturing is required, such as for semiconductor integrated circuits, , a cartridge filter made entirely of fluorine resin without metal elution is used, and in that case, it is preferable that the core of the present invention is also made of entirely fluororesin. Examples of fluorocarbon resins include tetrafluoroethylene resin (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), and ethylene-tetrafluoropropylene copolymer (FEP). Ethylene fluoride copolymer resin (ETFE), ethylene trifluoride resin (PCTFE), ethylene-ethylene trifluoride copolymer resin (ECTFE), vinylidene fluoride (PVdF), vinyl fluoride resin (PVF), tetrafluoride Examples include ethylene-hexafluorinated propylene-perfluoroalkyl vinyl ether copolymer resin (EPE), but PTFE is most preferred in terms of chemical resistance, strength, etc.

If a round rod made of fluororesin is inserted into the center opening of the cartridge material instead of a cylinder, if the gap between the round rod and the opening is small, the flow of liquid will be disturbed and energy loss will occur, and if the gap is large, the cartridge will This causes deformation of the material, resulting in insufficient functionality of the core material.

In the present invention, vertical grooves are provided on the outside of the core along the vertical axis to ensure smooth flow of liquid even when the gap between the core and the material is reduced. the result,
A decrease in overefficiency and pressure loss due to liquid stagnation can be prevented. Furthermore, since the voids can be made smaller, deformation of the material can be effectively prevented.

The core of the present invention preferably has three or more vertical axes, preferably three to eight. If there are too many pleats, the pleats of the material will get stuck in the grooves and become easily deformed.
If it is too small, the flow of the liquid will be disturbed. The width of the vertical groove is
A value of 2.5 to 5 mm is appropriate; if it is larger than that, the pleats tend to cave in, and if it is smaller, it is necessary to increase the number of pleats, making processing complicated.

The appropriate depth of the vertical groove is about 2 to 8 mm.

The core of the present invention may have latitudinal grooves 2 around the periphery. The latitudinal grooves help fluid flow into the longitudinal grooves;
Makes the flow of liquid even smoother. The number of latitudinal grooves is 2 to 10.
Books, especially 3 to 6 books, are suitable, and the width is 1 to 6 mm.
Particularly preferred is 2 to 4 mm.

In the present invention, it is preferable that the latitudinal grooves are shallower than the longitudinal grooves. This allows the liquid to flow more smoothly. The preferred depth of the latitudinal groove is 0.5 to 3 mm.

The core may have a groove 3 continuous with the longitudinal groove on the surface that contacts the open cap of the cartridge material.
As a result, the liquid flows smoothly in the liquid sampling portion of the cartridge, and sudden liquid flow and air intrusion can be avoided.

Effects of the invention By inserting the core of the present invention into the central opening of the cartridge material, deformation of the cartridge can be prevented and the flow of liquid can be made smooth.

[Brief explanation of the drawing]

Figure 1 is a side view of the core of the invention, and Figure 2 is a side view of the core of the invention.
One end of the core is shown in the figures and FIG. 3 shows the other end of the core shown in FIG. 1... vertical groove, 2... latitudinal groove, 3... groove continuous with the longitudinal groove, 4... cornered part.

Claims (1)

[Claims for Utility Model Registration] 1. A round bar-shaped fluororesin core for cartridge material having a longitudinal groove at least in the longitudinal direction and having a diameter that can be inserted into the central opening of the cartridge material. 2. The core according to item 1, having three or more grooves in the longitudinal direction. 3. The core according to item 1, having a lateral groove around the periphery. 4. The core according to item 3, in which the longitudinal grooves are deeper than the latitudinal grooves. 5. The core according to item 1, wherein the core diameter is 0.1 to 12 mm smaller than the diameter of the central opening of the cartridge material. 6. The core according to item 1, which has a groove continuous with the longitudinal groove on the surface of the cartridge material that is in contact with the opening cap of the central opening diameter.