A separação dos torrões de terra roxa do café, pelo magnetismo
Autor(a) principal: | |
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Data de Publicação: | 1950 |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Bragantia |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051950000900002 |
Resumo: | In the regions of the so called "purple soils", in the State of São Paulo and Northern Paraná, coffee harvested from the ground is attended by a number of foreign matter among which lumps of soils of varying sizes make up the bulk of it. The separation of such lumps as attained by mechanical devices usually employed is always not satisfactory, the result being that remaining lumps will give a red color to the coffee beans, thus lowering the grade. Since the soil lumps have an appreciable amount of iron oxyde, mainly in the form of magnetite (Fe3O4) ; there would appear that the use of electro-magnets or permanent magnets of high power would give good results. A new machine "catador Dr. Isay" having rotative permanent magnets thus appeared in the market and tests were officiary run to determine its perfomance. It was verified that such machine performs a good job in the separation of small lumps, just the ones which are not efficiently separeted by other types of machines usually employed like "washers" (lavadores) "assorting machines" (seletores), and "stoners" (catadores de pedra). A theoretical study of the new machine "catador Dr. Isay" was also perfomed, showing that the following factors are likely to have an important bearing on its performances : a) centrifugal force to which the lumps are subjected which is dependent upon the velocity of the magnetic rolls and the lumps effective size ; b) shape of the "entre-ferro" ; c) characteristics of the material employed in the manufacture of the permanent magnet. In this respect it seems advisable to recommend the use of alnico alloys, mainly class 5 and 6. |
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A separação dos torrões de terra roxa do café, pelo magnetismoIn the regions of the so called "purple soils", in the State of São Paulo and Northern Paraná, coffee harvested from the ground is attended by a number of foreign matter among which lumps of soils of varying sizes make up the bulk of it. The separation of such lumps as attained by mechanical devices usually employed is always not satisfactory, the result being that remaining lumps will give a red color to the coffee beans, thus lowering the grade. Since the soil lumps have an appreciable amount of iron oxyde, mainly in the form of magnetite (Fe3O4) ; there would appear that the use of electro-magnets or permanent magnets of high power would give good results. A new machine "catador Dr. Isay" having rotative permanent magnets thus appeared in the market and tests were officiary run to determine its perfomance. It was verified that such machine performs a good job in the separation of small lumps, just the ones which are not efficiently separeted by other types of machines usually employed like "washers" (lavadores) "assorting machines" (seletores), and "stoners" (catadores de pedra). A theoretical study of the new machine "catador Dr. Isay" was also perfomed, showing that the following factors are likely to have an important bearing on its performances : a) centrifugal force to which the lumps are subjected which is dependent upon the velocity of the magnetic rolls and the lumps effective size ; b) shape of the "entre-ferro" ; c) characteristics of the material employed in the manufacture of the permanent magnet. In this respect it seems advisable to recommend the use of alnico alloys, mainly class 5 and 6.Instituto Agronômico de Campinas1950-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051950000900002Bragantia v.10 n.9 1950reponame:Bragantiainstname:Instituto Agronômico de Campinas (IAC)instacron:IAC10.1590/S0006-87051950000900002info:eu-repo/semantics/openAccessTosello,Andrépor2010-06-09T00:00:00Zoai:scielo:S0006-87051950000900002Revistahttps://www.scielo.br/j/brag/https://old.scielo.br/oai/scielo-oai.phpbragantia@iac.sp.gov.br||bragantia@iac.sp.gov.br1678-44990006-8705opendoar:2010-06-09T00:00Bragantia - Instituto Agronômico de Campinas (IAC)false |
dc.title.none.fl_str_mv |
A separação dos torrões de terra roxa do café, pelo magnetismo |
title |
A separação dos torrões de terra roxa do café, pelo magnetismo |
spellingShingle |
A separação dos torrões de terra roxa do café, pelo magnetismo Tosello,André |
title_short |
A separação dos torrões de terra roxa do café, pelo magnetismo |
title_full |
A separação dos torrões de terra roxa do café, pelo magnetismo |
title_fullStr |
A separação dos torrões de terra roxa do café, pelo magnetismo |
title_full_unstemmed |
A separação dos torrões de terra roxa do café, pelo magnetismo |
title_sort |
A separação dos torrões de terra roxa do café, pelo magnetismo |
author |
Tosello,André |
author_facet |
Tosello,André |
author_role |
author |
dc.contributor.author.fl_str_mv |
Tosello,André |
description |
In the regions of the so called "purple soils", in the State of São Paulo and Northern Paraná, coffee harvested from the ground is attended by a number of foreign matter among which lumps of soils of varying sizes make up the bulk of it. The separation of such lumps as attained by mechanical devices usually employed is always not satisfactory, the result being that remaining lumps will give a red color to the coffee beans, thus lowering the grade. Since the soil lumps have an appreciable amount of iron oxyde, mainly in the form of magnetite (Fe3O4) ; there would appear that the use of electro-magnets or permanent magnets of high power would give good results. A new machine "catador Dr. Isay" having rotative permanent magnets thus appeared in the market and tests were officiary run to determine its perfomance. It was verified that such machine performs a good job in the separation of small lumps, just the ones which are not efficiently separeted by other types of machines usually employed like "washers" (lavadores) "assorting machines" (seletores), and "stoners" (catadores de pedra). A theoretical study of the new machine "catador Dr. Isay" was also perfomed, showing that the following factors are likely to have an important bearing on its performances : a) centrifugal force to which the lumps are subjected which is dependent upon the velocity of the magnetic rolls and the lumps effective size ; b) shape of the "entre-ferro" ; c) characteristics of the material employed in the manufacture of the permanent magnet. In this respect it seems advisable to recommend the use of alnico alloys, mainly class 5 and 6. |
publishDate |
1950 |
dc.date.none.fl_str_mv |
1950-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051950000900002 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051950000900002 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
10.1590/S0006-87051950000900002 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Instituto Agronômico de Campinas |
publisher.none.fl_str_mv |
Instituto Agronômico de Campinas |
dc.source.none.fl_str_mv |
Bragantia v.10 n.9 1950 reponame:Bragantia instname:Instituto Agronômico de Campinas (IAC) instacron:IAC |
instname_str |
Instituto Agronômico de Campinas (IAC) |
instacron_str |
IAC |
institution |
IAC |
reponame_str |
Bragantia |
collection |
Bragantia |
repository.name.fl_str_mv |
Bragantia - Instituto Agronômico de Campinas (IAC) |
repository.mail.fl_str_mv |
bragantia@iac.sp.gov.br||bragantia@iac.sp.gov.br |
_version_ |
1754193290259857408 |