Filter and production method thereof

Details Filter and production method thereof Filter and production method thereof

2001-12-31

2004-06-01

Smith, Duane (Department: 1724)

Gas separation

With means securing or retaining separating media

Unit or cohesive sheet-like media in flow line or frame

C055S486000, C055S495000, C055S497000, C055S521000, C055S527000, C055SDIG005, C264S005000, C264S006000, C264S112000, C264S171180, C264S255000, C264S257000, C264SDIG004, C156S062200, C156S167000, C156S242000, C156S308400

Reexamination Certificate

active

06743274

ABSTRACT:

INCORPORATION BY REFERENCE
The disclosure of Japanese Patent Application No. 2001-16325 filed on Jan. 24, 2001, including the specification, drawings and abstract is incorporated herein by reference in its entirety.
BACKGROUND OF THE INVENTION
1. Field of Invention
The invention relates to a filter provided with a seal member attached to a peripheral edge portion of a filter body, and to a production method for the filter.
2. Description of Related Art
A typical filter as shown in
FIG. 8
or
FIG. 9
is formed by a filter body
52
, and a seal member
54
attached to a peripheral edge portion
52
e
of the filter body
52
(see Japanese Patent Application Laid-Open No. 8-24546). The filter
50
is set in a housing (not shown), with the peripheral edge portion
52
e
of the filter body
52
and the seal member
54
being clamped by a clamp portion of the housing. The seal member
54
is formed from a rubber or the like so as to have a frame-like shape. An inner peripheral surface of the seal member
54
has a groove
54
m
as shown in FIG.
9
. The seal member
54
is attached to the filter body
52
by fitting the peripheral edge portion
52
e
of the filter body
52
into the groove
54
m
. Furthermore, in an example as shown in
FIG. 10
, a seal member
56
is formed from a felt sheet so as to have a frame-like shape, and the seal member
56
is adhered to a peripheral edge portion
52
e
of the filter body
52
with an adhesive.
However, due to the construction in which the seal member
54
or
56
is attached to the filter body
52
by fitting or by using an adhesive, the above-described filter
50
needs a step of attaching the seal member
54
or
56
to the filter body
52
after a filter body producing step.
SUMMARY OF THE INVENTION
It is an object of the invention to eliminate the need for the step of attaching a seal member to a filter body after a filter body is produced.
A first aspect of the invention relates to a filter including a filter body, and a seal member attached to a peripheral edge portion of the filter body. In the filter of this aspect of the invention, the seal member is fused to a peripheral edge portion of the filter body, by being fused to fibers that form the filter body when the fibers are in a semi-melted state.
According to the first aspect of the invention, the seal member is fused to the filter body when the fibers that form the filter body are in the semi-melted state. Therefore, the step of attaching a seal member after production of the filter body is eliminated.
A second aspect of the invention relates to a filter including a filter body that is formed by layering semi-melted fibers over a forming surface, and a seal member attached to a peripheral edge portion of the filter body, by being fused to the semi-melted fibers.
According to the second aspect of the invention, when the semi-melted fibers that form the filter body are layered over the forming surface, the semi-melted fibers fuse to the seal member so that the seal member is attached to the filter body. Therefore, the formation of the filter body and the attachment of the seal member to the filter body can be simultaneously accomplished. Therefore, the step of attaching a seal member after production of the filter body is eliminated.
A third aspect of the invention relates to a production method for a filter including the steps of: disposing a seal member over a forming surface; and then forming a filter body by layering semi-melted fibers over the forming surface and the seal member.
Since the semi-melted fibers are layered over the forming surface after the seal member is disposed over the forming surface, the seal member and the semi-melted fibers that form the filter body become fused during formation of the filter body. Therefore, the step of attaching the seal member after production of the filter body can be eliminated.


REFERENCES:
patent: 4636231 (1987-01-01), Thornton et al.
patent: 5674302 (1997-10-01), Nakayama et al.
patent: 5888442 (1999-03-01), Kometani et al.
patent: 6293984 (2001-09-01), Oda et al.
patent: 6379438 (2002-04-01), Schneider et al.
patent: 6454827 (2002-09-01), Takagaki et al.
patent: 2002/0026776 (2002-03-01), McNaughton
patent: 2002/0129587 (2002-09-01), Oda et al.
patent: 2002/0132544 (2002-09-01), Takagaki
patent: 0 692 294 (1996-01-01), None
patent: 0 982 062 (2000-03-01), None
patent: A 8-24546 (1996-01-01), None
patent: 8-38834 (1996-02-01), None
patent: WO 00/18489 (2000-04-01), None
U.S. patent application Ser. No. 09/842,708,Takagaki et al., filed Apr. 27, 2001.

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