JPS6012579Y2 - Dust collector filter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a filter for a dust collector.

Hitherto, woven fabric type and felt type filters have been known as this type of filter.

However, in these filters, the pore diameter of the filter is relatively large, so that a so-called blowhole phenomenon in which dust passes through the filter without being collected by the filter often occurs, resulting in a decrease in dust collection efficiency.

To solve this problem, a filter has been proposed in which felt is sandwiched between a polytetrafluoroethylene (hereinafter referred to as PTFE) porous sheet and a woven fabric.

According to this filter, the phenomenon of blow-out can be prevented by reducing the diameter of the micropores in the PTFE porous sheet.

However, when this filter is put into practical use, the pressure loss due to clogging increases as the operating time of the dust collector increases, and in order to maintain the initial dust collection efficiency, the pressure of the dust-containing gas flowing into the dust collector gradually increases. The problem is that we have to go.

In addition, the filter is sometimes subjected to a dusting operation to remove dust adhering to the surface thereof at predetermined intervals, but there is also a problem in that the woven fabric is easily damaged by the impact of direct dusting off at this time.

The present invention relates to a dust collector filter that solves the above problems of conventional products at once.A porous PTFE sheet is partially adhered to one side of a breathable sheet-like base material, and the other side of the base material is flocked. It is made up of

Hereinafter, examples of the present invention will be explained with reference to the drawings.

In the drawings, 1 indicates a thickness of 0.05 to 5 TI with breathability.
It is a sheet-like base material of about rIrL, and is composed of, for example, woven fabric, non-woven fabric, or a mesh sheet having a large number of meshes of about 5 to 100 meshes.

One side of this sheet-like base material 1 is made of PTF with a thickness of about 10 to 40 μm and a porosity of about 50 to 95%, in which countless micropores with a pore diameter of about 0.1 to 5 μm are formed by stretching or foaming.
E The porous sheet 2 is partially adhered with an adhesive (not shown).

The bonding area between the sheet-like base material 1 and the porous PTFE sheet 2 is such that the adhesive strength is maintained to an extent that prevents peeling of the base material 1 and the porous sheet 2 during use, and the permeability of the porous sheet 2 is large. In order to avoid causing a large decrease in width, it is preferable that the surface area of one side of the porous sheet 2 is 5 to 50%.

Note that the shape of the partial adhesion between the two can be dotted, meshed, or striped.

The other side of the sheet-like base material 1 with the PTFE porous sheet 2 partially adhered to one side is coated with a carding machine.
Flocking 3 is performed by needle haunch processing using a machine.

The material of the flocked hair 3 is not particularly limited, but short fibers such as polypropylene, polyester, nylon, or carbon are usually used.

The present invention is constructed as described above, and the other side of the sheet-like base material is flocked, and since this flocking has shock-absorbing ability, the sheet-like base material can be easily removed by dusting off at predetermined intervals. The material or porous PTFE sheet is not damaged, and as will become clear from the examples below, the pressure loss is also small.

Example One side of a nylon woven fabric was needle-punched using a carding machine to form nylon staple fibers (fiber length approximately 30 mm, fiber diameter 20 mm).
μ) densely flocked (flocking density 120 g/d) L, and then applied a nylon hot melt adhesive with a particle size of 0.5 mm (manufactured by Daicel Industries, trade name: Diamid T-45) to the other side of the woven fabric.
0) was spread at approximately uniform intervals so as to cover 35% of the surface area of one side of the woven fabric, and heated at 160° C. for 1 minute to fix the adhesive on the surface of the woven fabric.

Next, a fired PTFE porous sheet with a thickness of 25μ, an average micropore diameter of 1.8μ, and a porosity of 86% was superimposed on the adhesive-fixed surface of the woven fabric, and the temperature was 170°C and the pressure was 1kg.
/cn! The woven fabric and porous sheet were heated and pressurized for 3 minutes to adhere the woven fabric and the porous sheet in dots, thereby obtaining a filter for a dust collector.

In order to know the dust collection performance of this filter, the filtration area of the filter is 0.5 ho, and the particle size of this filter is 0.3~
Air containing 30μ of flour at a rate of 185y/d was blown onto the porous sheet at a flow rate of 1 to 7t'/min.
When dust collection was performed continuously for two consecutive periods, the dust collection efficiency was 9.
The dust collection efficiency was 9.3%, and the pressure loss was 4.3 to 5.2 cm water column, and the dust collection efficiency was good, and the pressure loss was also small.

For comparison, dust collection was performed under the same conditions on a conventional product in which one side of the woven fabric was flocked in the same manner as above, and the same PTFE porous sheet as above was placed on the flock. The dust collection efficiency was 98.8%, which was almost the same as the product of this invention, but the pressure loss was 7.6 to 10.2*.
It was a large pillar.

[Brief explanation of drawings]

The drawing is a front view showing an example of a filter for a dust collector according to the present invention. 1... Sheet-like base material, 2... PTF
E Porous sheet, 3...Flocking.

Claims (1)

[Scope of utility model registration request] A filter for a dust collector, which is formed by partially adhering a polytetrafluoroethylene porous sheet to one side of a breathable sheet-like base material, and further having flocked hair on the other side of the base material.