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Large diameter thermoplastic seal

A technology of thermoplastic materials and sealing rings, applied in sealing devices, engine sealing, vehicle parts, etc., can solve the problem of not producing large-diameter seals

Inactive Publication Date: 2011-11-23
SAINT GOBAIN PERFORMANCE PLASTICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional methods for forming thermoplastic seals have not produced large diameter seals with desirable mechanical properties

Method used

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  • Large diameter thermoplastic seal
  • Large diameter thermoplastic seal
  • Large diameter thermoplastic seal

Examples

Experimental program
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Effect test

example 1

[0059] Four PEEK rods were heated to different temperatures (150°C, 200°C, 285°C, and 310°C) and formed around a steel wheel. The formability of the heated PEEK rods was measured as the distance between the two ends of the 34 inch rod as it was tightly wound on a 15.5 inch diameter steel wheel. Table 1 shows the formability.

[0060] Table 1. Formability of thermoplastic rods

[0061]

[0062] NF - non-formable

[0063] Rods heated to 150°C were too rigid to form. With increasing temperature, the flexibility of the PEEK rod also increases. At around 310°C, PEEK rods have relatively high formability.

example 2

[0065] Three PEEK rods were heated to 310°C and shaped around a steel wheel. When the temperature of the core reaches a specified temperature, the arcs are removed from the wheel. The relaxation of the cooled PEEK arc was measured to determine resilience. As demonstrated in Table 2, the PEEK rods rebounded significantly when removed from the wheel at temperatures above the glass transition temperature of PEEK. These PEEK arcs showed similar and relatively low resilience when removed below the glass transition temperature.

[0066] Table 2. Resilience of Thermoplastic Rods

[0067]

example 3

[0069] Fourteen 4"x1"x1" extruded PEEK rods available from McMaster-Carr were used to prepare seven welded rods by contact hot plate welding. One was welded after drying at 90°C for 3 hours prior to welding. Sample Formation The remaining samples were formed from a plurality of rods dried at temperatures ranging from 135°C to 190°C for 2 hours.

[0070] The samples were prepared by heating the rod ends using a heater temperature in the range of 385°C to 450°C and contacting the rod ends together under a pressure of 100 psi. These samples were machined for tensile testing. In addition, some of these samples were annealed at a temperature of 250°C for a period of 4 hours. These samples were compared to an extruded sample available from McMaster-Carr and an extruded control available from Ensinger. Table 3 shows the elongation at break properties of these samples.

[0071] Table 3. Elongation at break of welded samples

[0072]

[0073]

[0074] Extruded PEEK from McMas...

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Abstract

A seal ring includes a weld and a thermoplastic material. The thermoplastic material has a weld elongation-at-break of at least 3%. The thermoplastic material can have a glass transition temperature of at least 100oC. The thermoplastic material with the weld can have a weld elongation-at-break of at least 3%. The seal ring can have a circumference of at least 0.62 meters. The seal ring can have a coefficient of friction of not greater than 0.45.

Description

technical field [0001] The present disclosure relates generally to thermoplastic seals, and in particular to large diameter thermoplastic seals. Background technique [0002] Different industries are increasingly turning to larger equipment to meet multiple operational requirements. As the industry develops large equipment, it also seeks large components such as seals and O-rings. Often, such large equipment is located in remote and harsh environments, increasing the need for durable and tough seals. For example, as the oil and gas industry seeks to drill in deeper water, the size of the equipment used is increasing, and as a result, the requirement for longer-lasting larger products that can survive the harsh environment is also increasing. However, conventional methods for forming thermoplastic seals have not produced large diameter seals with desirable mechanical properties. Contents of the invention [0003] One conventional method involves compression molding. Con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/10
CPCC09K2200/0657C09K3/10F16J15/00Y10T428/215F16J15/102F16J15/022F16J15/06F16J15/108B29C65/00
Inventor C·赛利克S·克拉克G·C·小黑德莱斯H·乔斯K·维德斯瓦蓝C·瓦德那雷J·索萨H·R·格拉姆伯
Owner SAINT GOBAIN PERFORMANCE PLASTICS CORP