US3901636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic extrusion and odor elimination apparatus
Assignee: Beloit Corp
•
Filing: 1973-06-11
•
Granted: 1975-08-26
•
Expires: 1993-06-11
Abstract
Abstract Odor elimination apparatus for plastic film in which at least two extruded plastic films are combined outside of the die. The apparatus utilizes a valve adapting a single extruder to supply two melt streams to a dual melt chamber dual slot die. One melt chamber of the dual slot die is heated to a temperature below the temperature of oxidation of the resin of the thermoplastic material extruded through the die. The other melt chamber is heated above the oxidation temperature of the thermoplastic material extruded through the die, to increase the adhesive qualities of the extruded film to effectively bond with the thermoplastic material heated to a low temperature. The two films are then combined and the high temperature film is sandwiched between the low temperature film and a substrate, trapping the odor of the high temperature film. In a modified form of the invention, the film heated to a high temperature is passed through a tortuous path and heated to its high temperature while passing through this path.
Inventors
- 👤 Stanley C Zink
- 👤 William R Penrod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:52
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/695; B29C48/001; B29C48/0013; B29C48/0014; B29C48/03; B29C48/07; B29C48/08; B29C48/16; B29C48/18; B29C48/21; B29C48/70; B29C48/705; B29C48/78; B29C48/86; B29C48/865; B29C48/88; B29C48/911; B29C48/9135; B29C48/914; B32; B32B; B32B27/00; B32B27/06; B32B27/10; B32B27/32; B32B37/00; B32B37/14; B32B37/15; B32B37/153; B32B2250/00; B32B2250/03; B32B2250/40; B32B2317/00; B32B2317/12; B32B2323/00; B32B2323/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
222 words
In a flow divider valve for coating and deodorizing hot melt plastic and in combination with an extruder and a metering valve supplying hot melt plastIc to the flow divider valve and a dual slot die downstream of the flow divider valve, for extruding two streams of hot melt plastic film at different temperatures for coating a substrate, a valve body having an inlet therein and spaced outlets leading from said valve body for connection with inlets of the duel slot die, a passageway in said valve body leading at right angles with respect to said inlet, and a flow divider slidably guided in said passageway and having a peak positionable in alignment with the center line of said inlet to equally divide the flow of hot melt plastic to flow along said passageway in opposite directions, said flow divider being generally cylindrical in cross section and having a sliding fit with said passageway and having oppositely sloping sides terminating into a peak conforming generally to the form of the passageway and movable along said passageway and inlet to divide the flow to flow in opposite directions along said passageway proportionate to the positioning of said peak along said inlet, and means adjustably moving said flow divider along said passageway and selectively proportioning the flow of hot melt plastic through said outlets.
Claim 2
Dependent Claim
222 words
In a flow divider valve for coating and deodorizing hot melt plastic and in combination with an extruder and a metering valve supplying hot melt plastIc to the flow divider valve and a dual slot die downstream of the flow divider valve, for extruding two streams of hot melt plastic film at different temperatures for coating a substrate, a valve body having an inlet therein and spaced outlets leading from said valve body for connection with inlets of the duel slot die, a passageway in said valve body leading at right angles with respect to said inlet, and a flow divider slidably guided in said passageway and having a peak positionable in alignment with the center line of said inlet to equally divide the flow of hot melt plastic to flow along said passageway in opposite directions, said flow divider being generally cylindrical in cross section and having a sliding fit with said passageway and having oppositely sloping sides terminating into a peak conforming generally to the form of the passageway and movable along said passageway and inlet to divide the flow to flow in opposite directions along said passageway proportionate to the positioning of said peak along said inlet, and means adjustably moving said flow divider along said passageway and selectively proportioning the flow of hot melt plastic through said outlets.
Claim 3
Dependent Claim
60 words
The flow divider valve of claim 1, wherein a rod extends from said flow divider valve along said passageway through said housing, and means are provided for rectilinearly moving said rod to vary the position of said flow divider valve along said passageway and inlet to divide the flow to flow in opposite directions along said passageway in preselected proportions.
Claim 4
Dependent Claim
54 words
The flow control valve of claim 2, wherein the spaced outlets leading from the valve body are in the form of adapters, and wherein a melt mixer is carried in at least one adapter for forcing the plastic in a tortuous path and attaining an even mixture thereof as forced into said extrusion die.
Claim 5
Dependent Claim
39 words
The flow divider valve of claim 3, wherein heaters close opposite ends of said valve body and other heaters encircle said adapters to maintain the hot melt plastic at a uniform flow temperature as forced into said extruder die.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |