 Carburetor and metering device therefor |
| OF THE PREFERRED EMBODIMENTS Referring now to the drawings, and in particular to FIG. 1, a four ... |
|
| Method of forming a fibrous web using a variable transverse webber |
| The present invention is directed to the high-speed production of blends of long and short fibers ... |
|
| Method of forming and bonding fluff pads |
| In the illustration given and with reference to first to FIG. 1, the numeral 10 designates ... |
|
| Method of fabricating airlaid articles and apparatus for performing the method |
| It is accordingly an object of the invention to provide a method and an apparatus for fabricating ... |
|
| Apparatus and method for the zoned placement of superabsorbent material |
| OF THE INVENTION For the purposes of the present description, the invention will be described in ... |
|
| Method for making shaped nonwoven fabric |
| Accordingly, an object of the present invention is to provide an improved shaped nonwoven fabric ... |
|
| Arrangement for air-layer fibre bodies on a moving air-permeable conveyor path |
| This object is achieved in accordance with the invention by means of an arrangement of the kind ... |
|
| Apparatus for forming controlled density fibrous pads for diapers and the other absorbent products |
| OF THE PREFERRED EMBODIMENTS Referring to the drawings FIG. 1, shows the drum assembly 1 which is ... |
|
| Buckle joint |
| Therefore, the object of the present invention is to provide a buckle joint that is capable of ... |
|
| Elastomeric materials reinforced with small diameter glass fibers |
| AND PREFERRED EMBODIMENTS The gist of the present invention lies in the discovery that very fine ... |
|
|
Method and apparatus for extrusion blow molding polyethylene terephthalate articles
| Details |
Inventors: Belcher, Samuel L.;
Assignee: Sabel Plastechs, Inc. (Cincinnati, OH)
Primary Examiner: Chiesa; Richard L.
Assistant Examiner:
Attorney, Agent or Firm: Wood, Herron & Evans
The present invention is directed to a method and apparatus for extrusion blow molding polyethylene terephthalate articles. Articles produced according to this invention may be monolayer or multilayer; they may be circumferentially or biaxially oriented; and they may be heat set. |
|
DETAILED DESCRIPTION The present invention is directed to a method and apparatus for extrusion blow molding polyethylene terephthalate articles.
Articles produced according to the practice of a preferred embodiment of the disclosed method and apparatus are monolayer PET and can be either circumferentially or biaxially oriented.
These articles are formed by enclosing segments of a monolayer tube of PET, which has been extruded from a single screw extruder, in one mold of a set of traveling blow molds and blowing the articles, as will be described more fully herein.
In another preferred embodiment, the articles produced are multilayer and can be either circumferentially or biaxially oriented.
These articles are formed by enclosing segments of a multilayer tube, which has been co-extruded from a plurality of extruders (each extruder extruding one component layer of the multilayer tube), in one mold of a set of traveling blow molds and blowing the desired articles, as will be described more fully herein.
Both the above-mentioned embodiments require at least one single-screw extruder that is specially adapted to continuously extrude PET in the form of a hollow tube such that the PET has sufficient hot melt strength to be subsequently blow molded.
A preferred extruder comprises a barrel having an input and an output opening, an extrusion screw disposed within the barrel, a die adapter attached to the barrel at the output end, a die head attached to the die adapter and a plurality of heater bands for heating the barrel, die adapter and die head, which in turn heat the PET.
The input opening in the barrel, which may be fitted with a hopper, is used for charging the extruder with PET pellets.
While any suitable PET pellets may be used in the disclosed method and apparatus, the following are listed as suitable examples: Eastman's 7352, 9663, 9921 and 9899; ICI's 5122c and 5822c; Goodyear's 7207 and 8006; and American Hoechst's T-95.
The design and operation of the PET extruder are critically important in the practice of the present invention and several competing factors must be considered
|
|
Nonmetallic Processes 
