Plastic article or earthenware shaping or treating: apparatus – Including means advancing continuous length work through...
Reexamination Certificate
2000-04-26
2002-02-19
Nguyen, Nam (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Including means advancing continuous length work through...
C425S315000, C425S316000, C425SDIG002
Reexamination Certificate
active
06347932
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus for extruding and cutting resin strands, and more particularly to an apparatus for extruding and cutting resin strands which has a configuration capable of achieving an accurate and easy initial setting for a desired angle of a cooling plate with respect to a cutting unit within a reduced period of time while minimizing the amount of cold water used and eliminating use of any cold water distributor, thereby reducing the manufacturing costs.
2. Description of the Prior Art
A variety of resin extruding and cutting devices are known which are configured to extrude a thermoplastic resin material into continued strands, to cool the extruded strands, and then to cut the strands into small pieces in the form of grains while drying them.
Referring to
FIG. 6
, an example of a conventional resin extruding and cutting device is illustrated which is disclosed in Japanese Laid-open Patent Publication No. Sho. 60-97806. This resin extruding and cutting device has features in that a water drain port is provided at a cooling plate. As shown in
FIG. 6
, the resin extruding and cutting device includes a resin extruding unit
71
for extruding a resin material into continued strands, and a resin cooling unit
72
for cooling the strands extruded from the resin extruding unit
71
. The resin cooling unit
72
includes a cooling plate
721
arranged in the vicinity of an outlet of the resin extruding unit
71
and adapted to spray cold water onto the strands emerging from the resin extruding unit
71
while feeding those strands from an upstream end thereof to a downstream end thereof, thereby cooling the strands, a drain duct
722
connected at an inlet thereof to the cooling plate
721
near the downstream end of the cooling plate
721
and adapted to drain the water, used to cool the strands, into a water receiving reservoir
723
, and a suction duct
724
connected to the cooling plate
721
near the downstream end of the cooling plate
721
and mounted with a suction fan
725
to remove moisture from the strands emerging from the cooling plate
721
. The suction duct
724
is open to the water receiving reservoir
723
at an outlet thereof. The resin extruding and cutting device also includes a cutting unit
73
mounted at the downstream end of the cooling plate
721
and adapted to cut the strands emerging from the cooling plate
721
into small pieces of a desired length, a collecting hopper
74
arranged beneath an outlet of the cutting unit
73
and adapted to collect the small pieces discharged from the cutting unit
73
, and a drying duct
75
connected to the collecting hopper
74
and adapted to dry the small pieces discharged from the collecting hopper
74
while feeding them to a storage tank. Cold air from an air supply source (not shown) is blown into the drying duct
75
.
In the conventional resin extruding and cutting device having the above mentioned configuration, resin strands extruded from the resin extruding unit
71
are cooled by cold water sprayed in the cooling plate
721
while passing through the cooling plate
721
, and then introduced into the cutting unit
73
. The cooled resin strands are cut by the cutting unit
73
into small pieces of a desired length which are, in turn, discharged into the collecting hopper
24
. The small pieces are then fed from the collecting hopper
24
to the storage tank via the drying duct
75
while being dried by cold air flowing along the drying duct
75
.
In order to allow the strands to be substantially free of moisture before entering the cutting unit
73
, the water used to cool the strands is drained from the cooling plate
721
through the drain duct
722
. The moisture attached to the strands are also removed from the strands by a sucking force from the sucking fan
725
, and then drained through the sucking duct
724
.
However, the above mentioned resin extruding and cutting device involves a problem in that the cooling water once used is drained, for disposal thereof, into the water receiving reservoir, so that a large amount of water is wasted.
The strand emerging from the cooling plate
721
of the cooling unit
72
should enter between drawing rollers included in the cutting unit
73
under the condition in which the entering angle of the strand is adjusted in accordance with the characteristics and diameter of the strand. However, no means capable of achieving such an adjustment is provided at the conventional device. For this reason, there is a problem in that a large amount of cut products with a poor quality are produced.
Referring to
FIG. 7
, another conventional resin extruding and cutting device is illustrated. This device has features in that it includes a separate drier. As shown in
FIG. 7
, the resin extruding and cutting device includes a resin extruding nozzle
81
for extruding a resin material into continued strands, and a resin cooling unit
82
arranged near the resin extruding nozzle
81
to cool the strands extruded from the resin extruding nozzle
81
. The resin cooling unit
82
includes a cooling plate
821
adapted to spray cold water onto the strands emerging from the resin extruding nozzle
81
while feeding those strands from an upstream end thereof to a downstream end thereof, thereby cooling the strands, a drain duct
823
connected at an inlet thereof to the cooling plate
821
near the downstream end of the cooling plate
821
and adapted to drain the water, used to cool the strands, into a water receiving reservoir
824
, a column
825
hingably coupled to the upstream end of the cooling plate
821
at an upper end thereof to hingably support the cooling plate
821
, and an extendable angle adjusting unit
827
hingably coupled to a middle portion of the cooling plate
821
at an upper end thereof and adapted to hingably move the cooling plate
821
about the upper end of the column
825
in accordance with an extension or retraction thereof, thereby adjusting the angle of the cooling plate
821
. The resin extruding and cutting device also includes a cutting unit
83
mounted at the downstream end of the cooling plate
821
and adapted to cut the strands emerging from the cooling plate
821
into small pieces of a desired length. The cutting unit
83
includes drawing rollers
831
and cutters
832
. The cutting unit
83
also includes a water supply pipe
833
for supply a flow of water to feed cut pieces from the cutter
832
. The resin extruding and cutting device further includes a conveyor
84
arranged in the vicinity of the outlet of the cutting unit
83
at one end thereof and adapted to feed the cut pieces emerging from the cutting unit
83
, and a drier
85
arranged at the other end of the conveyor
84
and adapted to dry the cut pieces fed by the conveyor
84
.
In the conventional resin extruding and cutting device having the above mentioned configuration, the strand emerging from the cooling plate
821
of the cooling unit
82
should enter the cutting unit
83
under the condition in which the entering angle of the strand is adjusted in accordance with the characteristics and diameter of the strand. To this end, the extended length of the extendable angle adjusting member
827
is adjusted, thereby adjusting the angle of the cooling plate
821
. Thus, the angle of the cooling plate
821
is set.
Resin strands extruded from the resin extruding unit
81
are sufficiently cooled by cold water sprayed in the cooling plate
821
while passing through the cooling plate
821
, and then introduced into the cutting unit
83
. In order to allow the strands to be stably introduced into the drawing rollers
831
of the cutting unit
83
while allowing a stable and reliable cutting operation of the cutting unit
83
, the water used to cool the strands is drained, in a controlled amount, from the cooling plate
821
through the drain duct
823
before the introduction of the strands into the cutting unit
83
.
The cooled resin strands are cut by the cutting unit
83
into small pieces of
Han Jin Ind. Co., Ltd.
Leyson Joseph
Nguyen Nam
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