Winding – tensioning – or guiding – Coil holder or support – Spool or core
Reexamination Certificate
1999-02-01
2001-03-06
Jillions, John M. (Department: 3653)
Winding, tensioning, or guiding
Coil holder or support
Spool or core
C242S613400, C242S614000, C242S614100
Reexamination Certificate
active
06196495
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a reel, and more particularly to a reel for winding photosensitive film, by which the photosensitive film having a predetermined width can be wound between flange members coupled to both sides of a reel member with a proper pressure, so that a large quantity of film may be wound around a circumference of the reel member.
BACKGROUND ART
Generally, photosensitive film used for making a printed circuit of a printed circuit board is manufactured through the steps of applying a photosensitive resin compound on a polyester film by a proper thickness, drying it at a predetermined temperature, and laminating a polyethylene film thereon. Here, the photosensitive resin composition comprises a polymeric binder as a binding carrier and a compound having at least one terminal ethylenically unsaturated group, i.e., a photopolymerizable monomer mixed with a photoinitiator and a solvent as main components.
An apparatus for manufacturing photosensitive film is shown in FIG.
1
. As shown in
FIG. 1
, the apparatus comprises a photosensitive resin supplying section
1
which makes a photosensitive resin compound and supplies a proper amount of the photosensitive resin compound, a polyester film supplying section
2
for supplying a polyester film on which the photosensitive resin compound supplied from the photosensitive resin supplying section
1
is applied, a drying section
3
for drying the photosensitive resin compound applied on a base layer of a photosensitive film
6
, a polyethylene film supplying section
4
which supplies a polyethylene film in such a manner that a surface layer of the photosensitive film
6
can be laminated on a photosensitive layer of the photosensitive film
6
which has been dried by the drying section
3
, and a winding section
7
for winding the photosensitive film
6
having the base layer, the surface layer, and the photosensitive layer interposed therebetween.
The photosensitive film
6
that has been wound by the winding section
7
consists of the photosensitive layer
6
a
, the base layer
6
b
formed on one side of the photosensitive layer
6
a
, and the surface layer
6
c
formed on the other side of the photosensitive layer
6
a
. In addition, as shown in
FIG. 2
, the photosensitive film
6
which is cut in a predetermined width and length is wound around a cylindrical core
8
.
The photosensitive film
6
is classified into an alkaline development type in which a non-exposed portion is removed by an alkaline aqueous, and a solvent development type in which a non-exposed portion is removed by an organic solvent. In the alkaline development type photosensitive film, a predetermined circuit pattern is obtained by the steps of separating the surface layer
6
c
from the photosensitive film
6
, heating and pressing the photosensitive layer
6
a
in such a manner that the photosensitive layer
6
a
can make contact with the board while maintaining the base layer
6
b
to be coated on the photosensitive layer
6
a
, placing a mask film having a predetermined pattern on the base layer
6
b
, and exposing the photosensitive film
6
to ultraviolet rays.
However, the above mentioned photosensitive film
6
, which is formed by stacking the photosensitive layer
6
a
, the base layer
6
b
and the surface layer
6
c
with each other, has a semi-solid state. Accordingly, if the photosensitive film
6
which is being wound around a core is subjected to a high tension, a pressure applied to the photosensitive layer
6
a
increases so that the photosensitive resin may be deformed. This kind of deformation may cause both edges of the wound photosensitive film
6
to be fused which is called “edge fusion phenomenon”, thereby making the photosensitive film
6
non-available. On the contrary, if a low tension is applied to the photosensitive film
6
which is being wound around the core, some of the photosensitive film
6
that has been wound around the core deviates from its initial wound position, so the winding shape of the photosensitive film
6
is deformed which is called “telescope phenomenon”, thereby resulting that the photosensitive film
6
is no more available to other processes in which the photosensitive film should be used.
In addition, in case that the size of the photosensitive film
6
is not suitable to the standard size (i.e., width of 300 to 500 mm, length of 100 to 200 mm), in other words, when the photosensitive film
6
has a width less than 300 mm and a length more than 300 m, the pressure applied to each layer of the photosensitive film wound around the cylindrical core is in inverse proportion to both a diameter and a width of each layer, and is in proportion to a winding tension of each layer, so the above mentioned “edge fusion phenomenon” or “telescope phenomenon” happens to be more extreme happened.
That is, as the length of the photosensitive film increases or as the width of the photosensitive film reduces, the higher tension should be applied to the photosensitive film to be wound in order to maintain the winding shape of the photosensitive film. However, if the tension applied to the photosensitive film becomes higher, the pressure applied to the photosensitive layer increases so that the semi-solid photosensitive resin may be more extremely deformed.
DISCLOSURE OF INVENTION
The present invention has been made to overcome the above described problems of the prior arts, and accordingly it is an object of the present invention to provide a reel for winding a photosensitive film, which not only stabilizes the winding shape of the photosensitive film, also minimizes the deformation of a photosensitive layer caused by a tension applied to the photosensitive film being wound, even when the photosensitive film having a narrow width and a long length is to be wound.
Another object of the present invention is to provide a reel for winding a photosensitive film, which can be easily handled when it is carried or stored.
Still another object of the present invention is to provide a reel for winding a photosensitive film, which has a sufficient strength to stand against a winding tension of the photosensitive film wound thereon, and in which an amount of the wound photosensitive film can be checked.
To achieve the above objects, the present invention provides a reel for winding a photosensitive film comprising a cylindrical reel member around which the photosensitive film is wound with a proper tension, and flange members which are detachably coupled to both sides of the reel member in such a manner that their inner surfaces, which are disposed in opposition to each other, are in close contact with to both edges of the wound photosensitive film.
The reel member includes a cylindrical inner reel and an outer reel which is fixed to an outer wall of the inner reel by a plurality of ribs in such a manner that the outer reel is spaced by a predetermined distance apart from the inner reel.
The flange members are formed at inner surfaces thereof with coupling protrusions which are inserted into ends of both the inner and outer reels, respectively.
In addition, the flange members are formed with windows so that the amount of the wound photosensitive film can be checked.
REFERENCES:
patent: 1823245 (1931-09-01), Kraus et al.
patent: 3088689 (1963-05-01), Perlini
patent: 3342435 (1967-09-01), Gelardi et al.
patent: 3485456 (1969-12-01), Weyrich et al.
patent: 4088278 (1978-05-01), Adair
patent: 4101095 (1978-07-01), Carter
patent: 4880180 (1989-11-01), Adair
patent: 5167378 (1992-12-01), Johanson
patent: 5370332 (1994-12-01), Goff et al.
patent: 5474254 (1995-12-01), Faulkner
patent: 5676332 (1997-10-01), Kraus et al.
patent: 0-281292 (1988-09-01), None
patent: 0-568062 (1992-11-01), None
patent: 2-135653 (1984-09-01), None
Choi Hyun-Seuk
Choi Woo
Hwang Jae-Young
Lee Byeong-Il
Na Chang-Hoon
Birch & Stewart Kolasch & Birch, LLP
Jillions John M.
Kolon Industries Inc.
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