Coating processes – With pretreatment of the base – Shielding or spacing
Reexamination Certificate
1999-09-30
2001-05-29
Cameron, Erma (Department: 1762)
Coating processes
With pretreatment of the base
Shielding or spacing
C427S333000, C427S342000, C427S386000, C427S410000, C427S412000, C427S412500
Reexamination Certificate
active
06238742
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a process for preadherizing polyester filaments to improve the adhesion characteristics towards rubber, especially for tire cord, by applying the preadherizing agent, consisting of at least two soluble components, one component (A) containing a polyepoxide and one component (B) containing a tertiary amine, after a filament yarn has been drawn.
2. Prior Art
Numerous processes are known for preadherizing polyester filaments to improve the adhesion properties towards rubber, and they generally involve the adherizing agents being applied prior to drawing of the yarn. But it is also known to apply a preadherizing agent consisting of two components to the drawn filament yarn so as to avoid soiling the drawing assemblies (WO 84/03707). In this known process, the preadherizing agent is applied via a metering pin. All existing processes apply a mixture which has ideally been prepared immediately before application and which ideally comprises a homogeneous distribution of the individual main components in a solution. To minimize the risk of coalescence and plugging and yet ensure uniform application, the applicator means have to be replaced and cleaned after an on-stream time of not more than 24 hours and the related pumps, containers and pipework after not more than 14 days.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a process which minimizes any soiling of the applicator means and hence increases the productivity of the entire spinning installation.
This object is achieved according to the invention when the component (A) and the component (B) are applied separately to the running filament yarn i.e. at the same time or stepwise to the running yarn, but at respective different locations on the running yarn. This has the advantage that the components only become mixed on the yarn and thus are not able to soil the applicator means with curing resin. The process according to the invention appreciably increases the on-stream times. Cleaning of the applicator means is then only necessary in the event of batch changes and for safety reasons. A further advantage is a more uniform distribution on the yarn and hence an improvement in the yarn run-off in the course of further processing.
REFERENCES:
patent: 5352483 (1994-10-01), Humbrecht et al.
Kirk-Othmer Encyclopedia of Chemical Technology, Fourth Edition, vol. 9, pp. 741-744, 1994.
Csonka Istvan
Meyer Beat
Cameron Erma
Rhodia Filtec AG
Striker Michael J.
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