JPH049618U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view showing an embodiment of the present invention;
2 is a cross-sectional view taken along the line shown in FIG. 1, FIG. 3 is a plan view, FIG. 4 is a right side view, FIG. 5 is an overall perspective view of the first conventional example, and FIG. FIG. 5 is a cross-sectional view taken along the line B--FIG. 7, and FIG. 7 is an overall perspective view showing a second conventional example. In the figure, 1a and 1b are bent pieces, 2 is a bent edge, and 3
a, 3b are upper and lower edges, 4a, 4b are end weld lines, 5 is an opening, 6 is a bag, 7a, 7b are long and short weld lines, 8, 9, and 10 are large, medium, and small gaps. Department.

Claims (1)

[Scope of utility model registration request] A rectangular filter paper made of synthetic fiber non-woven fabric is folded into two equal parts, two folded pieces and a bent edge are provided, and the upper and lower edges of each folded piece are sewn using an ultrasonic sewing machine or a high frequency machine. While welding and fixing with a sewing machine and providing an end weld line to form a bag portion having an opening on the front surface, the bent ends From the edge to a position slightly in front of the edge of the opening, weld and fix using the ultrasonic sewing machine or high-frequency sewing machine, and provide a plurality of long and short welding lines alternately, pointing from the opening side toward the bent edge. A filter medium for bag-shaped air filters, which is made up of large, medium, and small voids, respectively.