Bottles and jars – Sidewall structure
Reexamination Certificate
2001-03-30
2004-03-30
Young, Lee (Department: 3727)
Bottles and jars
Sidewall structure
C220S660000
Reexamination Certificate
active
06712232
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a plastic container for containing a liquid, such as toilet water or soy source and, more particularly, to a plastic container for containing a refill and a method of manufacturing such a plastic container for containing a refill.
2. Description of the Related Art
A known cartridge, i.e., a plastic container, capable of sealing a fluidic material, such as an adhesive, therein is formed by insert injection molding using a mold.
FIG. 5
shows a known cartridge
101
formed by insert injection molding using a mold. The cartridge
101
has a tube
102
of a plastic laminate, a bottom molded part
103
joined to a lower end part of the tube
102
, a top molded part
104
joined to an upper end part of the tube
102
, and a bottom member
106
of a plastic laminate bonded to the lower end of the bottom molded part
103
. When forming the cartridge
101
by insert injection molding, a mold inserted in the tube
102
must be capable of being extracted from the tube
102
. Therefore the inner circumference of the tube
102
must be smooth and must not have irregularities and the tube
102
must be slightly tapered from its lower end on the side of the bottom molded part
103
toward its upper end on the side of the top molded part
104
.
FIG. 6
is a sectional view of assistance in explaining a method of manufacturing the known cartridge
101
. The tube
102
has the shape of a tube having opposite open ends. The tube
102
is put on a mandrel
100
, i.e., a metal core, tapered from its lower end toward its upper end. When the mandrel
100
holding the tube
102
is set in a mold
111
, a molding cavity
103
a
corresponding to the annular bottom molded part
103
of the cartridge
101
is formed around the lower end part of the tube
102
, and a molding cavity
104
a
corresponding to the top molded part
104
is formed around the upper end part of the tube
102
. The molding cavities
103
a
and
104
a
are connected to a runner
112
formed in the mold
111
. After the tube
102
has been thus set in the mold
111
, a molten synthetic resin, such as a molten polyethylene resin through a gate
113
formed in the mold
111
and the runner
112
into the molding cavities
103
a
and
104
a
by an insert injection molding means. Thus, a body having the tube
102
provided with an annular bottom molded part
103
on its lower end part and a top molded part
104
joined to the upper end of the tube
102
, and having an open bottom end is formed.
Since the cartridge
101
is formed by insert injection molding using the mold, the bottom molded part
103
must be formed in an annular shape on the lower end part of the tube
102
when the top molded part
104
having an outlet opening is joined to the upper end of part of the tube
102
. Since the bottom molded part
103
is open, the bottom member
106
of the plastic laminate similar to that forming the tube
102
must be joined to the lower end of the bottom molded part
103
by heat sealing.
Since the bottom member
106
of the plastic laminate is joined to the bottom molded part
103
of the cartridge
101
, gaps are liable to be formed in the joint
106
a
of the bottom molded part
103
and the bottom member
106
if the rigidity of the bottom molded part
103
is insufficient and the bottom molded part
103
is loaded during transportation, and the cartridge
101
falls down easily. If the bottom member
106
of the plastic laminate is bonded unsatisfactorily to the bottom molded part
103
, the contents of the cartridge
101
leaks through faultily bonded parts of the joint of the bottom member
106
and the bottom molded part
103
. Even if the bottom member
106
is bonded closely to the bottom molded part
103
, the bottom member
106
of the plastic laminate is broken with a sharp point and the contents leaks or the barrier property of the bottom member
106
is deteriorated.
SUMMARY OF THE INVENTION
The present invention has been made in view of the foregoing problems and it is therefore an object of the present invention to provide a plastic container having a rigid bottom wall formed by molding a plastic material and resistant to the accidental formation of holes therein and the resultant leakage of the contents of the plastic container.
A plastic container according to one aspect of the present invention comprises a tube of a plastic laminate, a bottom wall formed so as to be joined to the inner circumference of a lower end part of the tube by an insert injection molding process, a hoop formed on the outer circumference of an upper end part of the tube by an insert injection molding process, and a top cover provided with a spout and bonded to the upper end surface of the hoop.
Since the bottom wall is joined to the inner circumference of the lower end part of the tube and the hoop is joined to the outer circumference of the upper end part of the tube, a mandrel inserted in the tube for insert injection molding can be extracted from the tube. Thus, the bottom wall and the hoop of the plastic container can be formed integrally with the tube by the insert injection molding process to complete the plastic container. The bottom wall thus formed by the insert injection molding process is more resistant to breakage than the bottom wall of the plastic laminate.
In this invention, the term of “insert injection molding means” is used in the sense that the plastic container is manufactured in the steps of:
forming the tube; putting the tube on a mandrel; inserting the mandrel holding the tube in a mold; injecting a molten resin into the first and the second cavity to form the bottom wall and the hoop; and bonding the top cover.
REFERENCES:
patent: 2802593 (1957-08-01), Slaughter
patent: 2849144 (1958-08-01), Southwell
patent: 3356263 (1967-12-01), Monroe
patent: 3432072 (1969-03-01), Quercia
patent: 3567104 (1971-03-01), Arslanian et al.
patent: 3734393 (1973-05-01), Stump
patent: 5058801 (1991-10-01), Frey et al.
patent: 5465856 (1995-11-01), Sheffler
patent: 5921431 (1999-07-01), Pych
patent: 6068900 (2000-05-01), Kohn et al.
patent: 6334548 (2002-01-01), Ichikawa et al.
patent: 537 299 (1973-05-01), None
patent: 0 893 355 (1999-01-01), None
patent: 2 132 978 (1984-07-01), None
patent: 2132978 (1984-07-01), None
Ichikawa Toru
Tahara Tomio
Tanaka Yoji
Kabushiki Kaisha Hosokawa Yoko
Ngo Lien
LandOfFree
Plastic container and method of manufacturing the same does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Plastic container and method of manufacturing the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Plastic container and method of manufacturing the same will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3254359