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Synthetic resin pelletizing machine
| Details |
Inventors: Kando, Akiyoshi; Yoshida, Hiroshi; Kuse, Kazuki;
Assignee: YKK Corporation (Tokyo, JP)
Primary Examiner: Silbaugh; Jan H.
Assistant Examiner: Dang; Vi Duong
Attorney, Agent or Firm: Hill, Steadman & Simpson
A synthetic resin pelletizing machine includes an extrusion cylinder forming, with a horizontal plane, an installation angle .theta. which is in the range of 0.degree.<.theta.<90.degree., a raw material feed passage extending upwardly from said extrusion cylinder at a predetermined angle relative to a longitudinal axis of said extrusion cylinder, and a cooling unit disposed below a die head and having a double bath construction composed of a first cooling bath and a second cooling bath disposed in the first cooling bath. The pelletizing machine thus constructed is compact in size and is capable of assuring a smooth feed of a raw material to the extrusion cylinder as well as a smooth passage of an extruded strand through the cooling unit. |
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DETAILED DESCRIPTION It is, therefore, an object of the present invention to provide a synthetic resin pelletizing machine which is compact in size, readily adaptable to the multi-product, small-quantity production system, and capable of assuring a smooth feed of raw resin to an extrusion unit as well as a smooth passage of an extruded strand through a cooling bath.
According to the present invention, there is provided a synthetic resin pelletizing machine of the type having a molding portion in which a raw material including a synthetic resin, a pigment and various additives is melted and kneaded and then shaped by extrusion into a strand, and the extruded strand is cooled, characterized in that an extrusion cylinder having at its lower end a die head forms, with a horizontal plane, an installation angle .
theta.
which is in the range of 0.
degree.
<.
theta.
<90.
degree.
, a raw material feed passage extends upwardly from said extrusion cylinder at a predetermined angle relative to a longitudinal axis of the extrusion cylinder, and a cooling unit is disposed below the die head for cooling the strand, the cooling unit having a double bath construction composed of a first cooling bath and a second cooling bath disposed in the first cooling bath.
The extrusion cylinder is generally arranged vertically and not horizontally, so that the pelletizing machine as a whole is compact in size and occupies a relatively small space in the horizontal direction.
Since the raw material is supplied obliquely from the raw material feed passage into the extrusion unit and enters toward the extrusion direction, the extrusion cylinder is free from a clogging problem which would otherwise occurs at an inlet of the extrusion cylinder.
The pelletizing machine ordinarily includes a cutting unit, which is disposed at a downstream end of a strand feed path in the cooling unit, for cutting the strand into pellets of a predetermined size.
The installation angle .
theta.
of the extrusion cylinder relative to the horizontal plane is preferably in the range of 45
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Nonmetallic Processes 
