http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-730643-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_646c8d72783141a642b609b55e60c013 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B29B13-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B29B13-00 |
| filingDate | 1951-11-06^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1955-05-25^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-730643-A |
| titleOfInvention | Improvements in or relating to articles or pieces of polyhexamethylene adipamide |
| abstract | Articles obtained from polyhexamethylene adipamide by pressure moulding, injection moulding, extrusion or centrifugal casting are stabilized dimensionally by heating to 400-500 DEG F. and then cooling the articles to a temperature not above 212 DEG F., the cooling being sufficiently slow to prevent the development of strain. Additionally the article may be boiled in water or treated with steam after the heat treatment to adjust its water content to 2-3 per cent or more, depending upon the conditions under which the article will be used. To obtain uniformity of water content throughout the article, the water content may be increased to beyond the value required and the article then partially dried. If the article is to be machined, rough machining may be done before or after the heat treatment and finish machining after the heat treatment and after the water or steam treatment, if used. When rough machining is performed before the heat treatment, large articles may be boiled prior to machining to effect partial relief of strain and to facilitate machining. The articles must then be dried before the heat treatment to prevent blistering. In examples (1) nylon rod was pressure moulded from flake, heated in an oil bath to 450 DEG F., the temperature maintained for 15 minutes and the rod cooled to room temperature over 2 1/2 hours. Gear blanks were machined from the rod and the blanks boiled in water to a water content of 2 1/2 per cent. The blanks were then finish machined. (2) 3/4 inch nylon rod was cut into pieces, heated at 450 DEG F. for 10 minutes and cooled over 2 hours. The pieces were boiled for 24 hours in water and then machined to produce rollers. (3) A nylon cylinder was obtained by centrifugal casting, boiled in water and then cut into rings. The rings were dried, heat treated at 450-475 DEG F. for 15 minutes and cooled by standing in air. The rings were then boiled to a water content of 4-5 per cent, partially dried to a water content of 2 1/2 per cent and finish machined. (4) Nylon rings were cut from a cylinder, heat treated at 450 DEG F. for an hour and cooled over several hours to room temperature. Saw cuts were made in the rings, the resulting gaps remaining constant in width in contrast to those made in untreated rings. (5) Similar to (4) but with rings obtained from a heat-treated rod. Specification 730,641 is referred to. |
| priorityDate | 1950-11-27^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
| Predicate | Subject |
|---|---|
| isDiscussedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/substance/SID419512635 http://rdf.ncbi.nlm.nih.gov/pubchem/compound/CID962 |
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