Method and extrusion line for producing peroxide-cross-linked polyethylene pipes
First Claim
1. A method of producing peroxide-cross-linked polyethylene pipes in an extrusion line that includes an extruder, a cross-linking oven and a withdrawal mechanism, wherein the cross-linking oven has a first heating section that extends from an inlet to an actuated deflection roller, and a second heating section that extends from the deflection roller to an outlet, the method including the steps of:
- extruding a pipe via the extruder;
subjecting the pipe to a stretching process;
monitoring and regulating the stretching process such that stretching of the pipe takes place primarily in the first heating section of the cross-linking oven, wherein stretching of the pipe in the second heating section is controlled to be close to zero; and
withdrawing the pipe from the cross-linking oven via the withdrawal mechanism.
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Accused Products
Abstract
A method and extrusion line for producing peroxide-cross-linked polyethylene pipes in an extrusion line having an extruder, a cross-linking furnace and a flue. The extruded tube is subjected to a stretching process, and the cross-linking furnace has a first heating section that extends from its inlet to an actuated deflection roller and a second heating section from the deflection roller to its outlet. The stretching process in the first heating section and the stretching process in the second heating section are monitored and regulated in such a manner that the necessary stretching of the pipe takes place primarily in the first heating section, and the stretching of the pipe in the second heating section is subjected to zero adjustment. In this case, the height of the deflection roller(s) of the cross-linking furnace and the angle of the heating sections to the horizontal plane can be height-adjustable.
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Citations
5 Claims
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1. A method of producing peroxide-cross-linked polyethylene pipes in an extrusion line that includes an extruder, a cross-linking oven and a withdrawal mechanism, wherein the cross-linking oven has a first heating section that extends from an inlet to an actuated deflection roller, and a second heating section that extends from the deflection roller to an outlet, the method including the steps of:
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extruding a pipe via the extruder; subjecting the pipe to a stretching process; monitoring and regulating the stretching process such that stretching of the pipe takes place primarily in the first heating section of the cross-linking oven, wherein stretching of the pipe in the second heating section is controlled to be close to zero; and withdrawing the pipe from the cross-linking oven via the withdrawal mechanism. - View Dependent Claims (2, 3, 4, 5)
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Specification