Method for blow forming a container made of plastic and for coating the inside of said container
The invention relates to a method for blow forming a container (1) from a parison (2) made of plastic. After heating, said container is preformed by a gas injected into the container (1, 2) at a low pressure of 5 bar and by expanding the inner volume of said container. The final shape of the contain...
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| creator | LOTHAR WILHELM CHATARD DOMINIQUE GRUNWALD HEINRICH KASS HANNO |
| description | The invention relates to a method for blow forming a container (1) from a parison (2) made of plastic. After heating, said container is preformed by a gas injected into the container (1, 2) at a low pressure of 5 bar and by expanding the inner volume of said container. The final shape of the container can then be achieved by igniting an inflammable gas injected into the container, whereby the combustion generates a higher blowing pressure, or by injecting an additional gas with a higher blowing pressure of approximately 40 bar into the container after pre-blowing. The invention aims at improving known blow forming methods in such a way that a barrier layer impervious to gases, aromatic substances or the like is produced on the inner side of the container without having to use big machines. To this end, a precursor gas is added to and mixed with the inflammable gas, the mixture is then ignited and a coating is formed on the inner surface of the container by the combustion. Alternatively, an inflammable precursor gas is injected into the shaped, stress-relieved container that has been formed by means of classical stretch blow forming. Said gas is then ignited and once again the coating is formed on the inner surface of the precursor gas by the combustion. |
| format | Patent |
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After heating, said container is preformed by a gas injected into the container (1, 2) at a low pressure of 5 bar and by expanding the inner volume of said container. The final shape of the container can then be achieved by igniting an inflammable gas injected into the container, whereby the combustion generates a higher blowing pressure, or by injecting an additional gas with a higher blowing pressure of approximately 40 bar into the container after pre-blowing. The invention aims at improving known blow forming methods in such a way that a barrier layer impervious to gases, aromatic substances or the like is produced on the inner side of the container without having to use big machines. To this end, a precursor gas is added to and mixed with the inflammable gas, the mixture is then ignited and a coating is formed on the inner surface of the container by the combustion. Alternatively, an inflammable precursor gas is injected into the shaped, stress-relieved container that has been formed by means of classical stretch blow forming. 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After heating, said container is preformed by a gas injected into the container (1, 2) at a low pressure of 5 bar and by expanding the inner volume of said container. The final shape of the container can then be achieved by igniting an inflammable gas injected into the container, whereby the combustion generates a higher blowing pressure, or by injecting an additional gas with a higher blowing pressure of approximately 40 bar into the container after pre-blowing. The invention aims at improving known blow forming methods in such a way that a barrier layer impervious to gases, aromatic substances or the like is produced on the inner side of the container without having to use big machines. To this end, a precursor gas is added to and mixed with the inflammable gas, the mixture is then ignited and a coating is formed on the inner surface of the container by the combustion. Alternatively, an inflammable precursor gas is injected into the shaped, stress-relieved container that has been formed by means of classical stretch blow forming. Said gas is then ignited and once again the coating is formed on the inner surface of the precursor gas by the combustion.</abstract><edition>7</edition><oa>free_for_read</oa></addata></record> |
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| subjects | AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES PERFORMING OPERATIONS PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS SPRAYING OR ATOMISING IN GENERAL TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL |
| title | Method for blow forming a container made of plastic and for coating the inside of said container |
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