Back vented barrel for an extruding assembly

Details Back vented barrel for an extruding assembly Back vented barrel for an extruding assembly

1999-12-09

2001-10-16

Cooley, Charles E. (Department: 1723)

Agitating

Rubber or heavy plastic working

With specified vent means

C366S076400, C366S085000

Reexamination Certificate

active

06302572

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The subject invention relates to a barrel in an extruding assembly of the type for the continuous blending and plasticizing of a heat softenable and curable molding compound and, more specifically, to a particular arrangement for venting gases.
2. Description of the Prior Art
Assemblies for extruding plastic are well known and frequently include a main extruder unit and a feed extruder unit in series to feed material to the main extruder. Each unit has a pair of screws independently driven for varying rotational speeds. The main extruder unit includes a back vented barrel having top, bottom, front, back and first and second side surfaces. A main extruder passage extends between the front and back surfaces, a feed extruder passage extends from the first side surface and into the main extruder passage, and a vent passage extends from the main extruder passage and is spaced from and between the feed extruder passage and the back surface. An example of such an assembly is disclosed in U.S. Pat. Nos. 4,063,718 to Koch and 4,134,714 to Driskill. As the background in each of these patents relates, the relative placement between the various passages can be critical to maximizing the performance of the assembly. In addition, it is important that the assembly have versatility for processing various different materials.
SUMMARY OF THE INVENTION AND ADVANTAGES
A back vented barrel defined by a block having top, bottom, front, back and first and second side surfaces. A main extruder passage extends between the front and back surfaces, a feed extruder passage extends from the first side surface and into the main extruder passage, and a vent passage extends from the main extruder passage and is spaced from and between the feed extruder passage and the back surface. The barrel is characterized by the vent passage extending from the top surface into the main extruder passage.
Accordingly, the subject invention places the vent passage in the top of the barrel to maximize venting performance over a wide range of conditions. The positioning of the vent passage eliminates the costly loss of material and creates a cleaner environment. The design also allows considerably higher levels of addition of the unmixed material as well as unmixed materials possessing low bulk density characteristics due to entrapped air. Furthermore, the vent passage is provided with a universal vent control for varying the restriction in the vent passage while allowing one vent adapter to function for two types of material, i.e., mixed and umnixed.


REFERENCES:
patent: 2736058 (1956-02-01), Dellheim
patent: 3350742 (1967-11-01), Wood
patent: 3457880 (1969-07-01), Eppenberger
patent: 3657195 (1972-04-01), Doerfel et al.
patent: 3704866 (1972-12-01), Mosher et al.
patent: 3963558 (1976-06-01), Skidmore
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patent: 4100244 (1978-07-01), Nonaka
patent: 4124306 (1978-11-01), Bredeson et al.
patent: 4134714 (1979-01-01), Driskill
patent: 5000670 (1991-03-01), Capelle
patent: 5080845 (1992-01-01), Herrmann et al.
patent: 5306132 (1994-04-01), Grundmann et al.
patent: 5468429 (1995-11-01), Li et al.
patent: 5804111 (1998-09-01), Kobayashi et al.
patent: 6024479 (2000-02-01), Haring
patent: 6076954 (2000-06-01), Gisko
patent: 915689 (1954-07-01), None
patent: 4-161238 (1992-06-01), None
patent: 5-185424 (1993-07-01), None

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