{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/56182"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/56182","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"The drying and curing of yellow leaf tobacco by air conditioning methods","abstract":"The flue curing process for tobacco is practiced today in nearly the same manner as when tobacco first became of commercial importance, with no definite procedure being followed. A scientific study has proved that the curing process is accurately defined within narrow limits, and that control rather than art may be more definitely relied upon. Tobacco curing differs from a true drying process in that both physical and chemical changes are involved. Since it is impractical to evaluate the chemical changes because of their complexity, the physical changes were investigated, for they govern both the chemical and physical changes which take place. Drying rate curves for each period of the curing process were obtained over a wide range of constant conditions of temperature, relative humidity, and air velocity. Correlation of these curing curves indicate the narrow limits of the conditions required for satisfactory curing, and the critical points beyond which resulted in poorly cured tobacco. From the results obtained, air conditioning improves the process by (1) reducing the time approximately one-half, thus doubling the capacity of the barns; (2) the production of uniform quality tobacco completely eliminating loss from improper curing; and (3) large reductions in labor and fuel requirements.","abstract_html":"The flue curing process for tobacco is practiced today in nearly the same manner as when tobacco first became of commercial importance, with no definite procedure being followed. A scientific study has proved that the curing process is accurately defined within narrow limits, and that control rather than art may be more definitely relied upon. Tobacco curing differs from a true drying process in that both physical and chemical changes are involved. Since it is impractical to evaluate the chemical changes because of their complexity, the physical changes were investigated, for they govern both the chemical and physical changes which take place. Drying rate curves for each period of the curing process were obtained over a wide range of constant conditions of temperature, relative humidity, and air velocity. Correlation of these curing curves indicate the narrow limits of the conditions required for satisfactory curing, and the critical points beyond which resulted in poorly cured tobacco. From the results obtained, air conditioning improves the process by (1) reducing the time approximately one-half, thus doubling the capacity of the barns; (2) the production of uniform quality tobacco completely eliminating loss from improper curing; and (3) large reductions in labor and fuel requirements.","abstract_has_math":false,"creators":["Smith, Henry Brower"],"institution":"Virginia Agricultural and Mechanical College and Polytechnic Institute","degree_name":"Master of Science","degree_level":"masters","degree_discipline":"Chemical Engineering","degree_department":"Chemical Engineering","school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1939,"date_issued":"1939","date_published":"1939","updated_at":"2026-07-24T05:56:34Z","subjects":[],"languages":["en_US"],"rights":["In Copyright"],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10919/56182","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.department","label":"Department","values":["Chemical Engineering"]},{"key":"dc:creator","label":"Author","values":["Smith, Henry Brower"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2015-08-07T14:18:07Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2015-08-07T14:18:07Z"]},{"key":"dc:date.issued","label":"Date","values":["1939"]},{"key":"dc:publisher","label":"Institution","values":["Virginia Agricultural and Mechanical College and Polytechnic Institute"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.dcmitype","label":"Dc Type Dcmitype","values":["Text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Virginia Agricultural and Mechanical College and Polytechnic Institute"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_US"]},{"key":"dc:rights","label":"Dc Rights","values":["In Copyright"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10919/56182"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The flue curing process for tobacco is practiced today in nearly the same manner as when tobacco first became of commercial importance, with no definite procedure being followed. A scientific study has proved that the curing process is accurately defined within narrow limits, and that control rather than art may be more definitely relied upon. Tobacco curing differs from a true drying process in that both physical and chemical changes are involved. Since it is impractical to evaluate the chemical changes because of their complexity, the physical changes were investigated, for they govern both the chemical and physical changes which take place. Drying rate curves for each period of the curing process were obtained over a wide range of constant conditions of temperature, relative humidity, and air velocity. Correlation of these curing curves indicate the narrow limits of the conditions required for satisfactory curing, and the critical points beyond which resulted in poorly cured tobacco. From the results obtained, air conditioning improves the process by (1) reducing the time approximately one-half, thus doubling the capacity of the barns; (2) the production of uniform quality tobacco completely eliminating loss from improper curing; and (3) large reductions in labor and fuel requirements."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Master of Science"]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["The drying and curing of yellow leaf tobacco by air conditioning methods"]}]}],"canonical_facts":{"dc:contributor.department":["Chemical Engineering"],"dc:creator":["Smith, Henry Brower"],"dc:date.accessioned":["2015-08-07T14:18:07Z"],"dc:date.available":["2015-08-07T14:18:07Z"],"dc:date.issued":["1939"],"dc:description.abstract":["The flue curing process for tobacco is practiced today in nearly the same manner as when tobacco first became of commercial importance, with no definite procedure being followed. A scientific study has proved that the curing process is accurately defined within narrow limits, and that control rather than art may be more definitely relied upon. Tobacco curing differs from a true drying process in that both physical and chemical changes are involved. Since it is impractical to evaluate the chemical changes because of their complexity, the physical changes were investigated, for they govern both the chemical and physical changes which take place. Drying rate curves for each period of the curing process were obtained over a wide range of constant conditions of temperature, relative humidity, and air velocity. Correlation of these curing curves indicate the narrow limits of the conditions required for satisfactory curing, and the critical points beyond which resulted in poorly cured tobacco. From the results obtained, air conditioning improves the process by (1) reducing the time approximately one-half, thus doubling the capacity of the barns; (2) the production of uniform quality tobacco completely eliminating loss from improper curing; and (3) large reductions in labor and fuel requirements."],"dc:description.degree":["Master of Science"],"dc:format.mimetype":["application/pdf"],"dc:identifier.uri":["http://hdl.handle.net/10919/56182"],"dc:language.iso":["en_US"],"dc:publisher":["Virginia Agricultural and Mechanical College and Polytechnic Institute"],"dc:rights":["In Copyright"],"dc:rights.uri":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:title":["The drying and curing of yellow leaf tobacco by air conditioning methods"],"dc:type":["Thesis"],"dc:type.dcmitype":["Text"],"thesis:degree_discipline":["Chemical Engineering"],"thesis:degree_level":["masters"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["Virginia Agricultural and Mechanical College and Polytechnic Institute"]},"updated_at":"2026-07-24T05:56:34Z"}