JPH079415U - Electret filter media - Google Patents

Abstract

(57) [Summary] [Purpose] An electret filter cloth and an antibacterial and antifungal agent and flame retardant agent are laminated on a supporting non-woven fabric resin-processed with a resin containing an antibacterial and antifungal agent and a flame retardant. Have 5 [Structure] The electret filter medium 1 is obtained by fusing an electretized filter cloth 2 and a supporting nonwoven fabric 3 with a fusing sheet 4. The non-woven cloth 3 is obtained by mixing and impregnating an acrylic resin 5 and a flame retardant 6, and spray-adding an antibacterial / antifungal agent 7 and drying. Thus, the electret filter medium is provided with antibacterial and antifungal properties and flame retardancy.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electret filter medium for capturing dust and other fine particles in the air.

[0002]

[Prior art]

 It is known that a filter cloth made of non-woven fabric is electretized in order to electrostatically capture dust, exhaust gas particles, pollen and other fine particles floating in the air. For example, those disclosed in JP-A-60-168510 or JP-A-61-95416. These electretized filter cloths are thin so that each of the fibers that make them up may electrostatically adsorb dust and the like and reduce pressure loss with respect to the flow of air, so that a uniform air flow is obtained. It is made of polypropylene, which has a particularly low rigidity using fibers. Therefore, it becomes an extremely flexible sheet, and if it is used as a filter body by folding it into a filter body, for example, the electretized filter cloth alone cannot maintain its own form and has a low strength. Therefore, as the electret filter medium for forming the filter body, an ordinary non-woven fabric is used for supporting the morphology.

[0003]

[Problems to be solved by the device]

 Since the conventional electret filter medium as described above retains and deposits the captured dust and the like, bacteria are propagated due to the decomposition of the organic matter in the dust and an offensive odor is generated. If such a filter medium is continuously used as an air filter, bacteria and the like will be carried away into the room on the downstream side, which will contaminate the air. Or it will bring a strange odor into the room. In order to prevent this, a filter for deodorization and sterilization must be provided on the downstream side of the air filter using the above electret filter medium to perform two-stage filtration. In addition, flame-retardant air filters for vehicles and houses are required.

[0004]

Means for Solving the Problems The electret filter medium of the present invention is one in which a supporting non-woven fabric is resin-processed with a resin mixed with an antibacterial and antifungal agent and a flame retardant, and is superposed and joined to an electretized filter cloth.

[0005]

[Action]

 This type of electret filter media is used with the electret filter cloth on the upstream side, but the supporting non-woven fabric on the downstream side holds an antibacterial and antifungal agent, so that the accumulated dust etc. It is suppressed and prevents the release of bacteria and offensive odors to the downstream side. Further, since the supporting nonwoven fabric is made flame-retardant, the electret filter medium has flame-retardant property. In this case, even if the electret filter cloth is not made flame-retardant, it has a practically sufficient fire spread prevention effect.

[0006]

【Example】

 FIG. 1 shows the construction of an electret filter medium 1 of the present invention. The electret filter medium 1 is formed by stacking an electretized filter cloth 2 and a supporting nonwoven fabric 3 with a sheet 4 for fusing interposed therebetween, and heat-sealing them with a heating roll (not shown) to join them.

The electretized filter cloth 2 is a nonwoven fabric made of polypropylene fibers having a nap of 2 to 8 denier and having a basis weight of about 40 to 100 gr / m ² , and subjected to a known electretization treatment.

The supporting non-woven fabric 3 is made by forming rayon fibers having a denier of about 8 to 15 into a non-woven fabric having a basis weight of about 40 gr / m ² , and an acrylic resin 5 having a weight of about 35% and an amount of the flame retardant 6 such as bromine / 5. An antimony oxide-based material is mixed and processed (impregnated) with a resin, and an antibacterial / antifungal agent 7, for example, parachlorometaxylenol (PCMX) is spray-added and dried.

The fusing sheet 4 is made of a polyamide fiber having a denier of about 5 into a mesh sheet having a basis weight of about 10 to 30 gr / m ² and a melting point of about 90 to 120 ° C.

The electret filter medium 1 is formed by superposing the electretized filter cloth 2, the fusing sheet 4, and the supporting non-woven cloth 3 and passing them through a heating roll so that the three layers are heat-sealed. It should be noted that it is not preferable to perform resin processing after heat-sealing the above three layers, because the effect of electretization is diminished. Further, instead of the fusing sheet 4, polymer powder having similar melting points may be used.

Further, the supporting non-woven fabric 3 can be made into a thin sheet with coarse mesh and sharp folds since it can be made to have a rigidity of a degree such that even a coarse mesh can retain its shape by resin processing. It is also possible to form a pleated filter with a fine pitch. Therefore, depending on the application, it is possible to select a filter with fine folds, or to select a non-woven fabric for support that has relatively fine mesh or thickness to increase the amount of antibacterial and antifungal agents. Is.

The electret filter medium 1 is used as a filter element 10 as shown in FIG. The electret filter medium 1 is fold-folded to form a filter body 11, which is attached and fixed inside a rectangular frame-shaped end plate 12. On the outer periphery of the frame-shaped end plate 12, a synthetic resin packing 13 having elasticity, such as one made porous by foaming, is attached to form the filter element 10.

The filter element 10 is attached to a rectangular mounting frame (not shown) to form an air filter, and air is introduced from the electretized filter cloth 2 side to remove dust and the like. The air filter has a prismatic shape and an appropriate shape, for example, is attached to an outside air intake of a vehicle air conditioner, and is used for other indoor air purifiers.

[0014]

[Effect of device]

 The electret filter medium of this invention has an antibacterial and antifungal agent and a flame retardant contained in the supporting non-woven fabric, so that the captured dust is prevented from spoiling, bacteria are propagated, and an offensive odor is generated. It prevents the air on the downstream side from being contaminated by the action of dust and the like. Therefore, it is not necessary to separately provide a filter for deodorant sterilization. It also becomes flame retardant and can be used for indoor air filters.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of an embodiment.

FIG. 2 is a perspective view of a filter element using the filter medium of the embodiment.

[Explanation of symbols]

 2 Electretized filter cloth 3 Nonwoven fabric for support 5 Resin 6 Flame retardant 7 Antibacterial and antifungal agent

Claims (1)

[Scope of utility model registration request] 1. An electret filter medium comprising an electret filter cloth and a supporting non-woven fabric resin-processed with a resin mixed with an antibacterial and antifungal agent and a flame retardant, which are superposed and joined.