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US 11,433,591 B2Granted
Process of forming polymeric material
AssigneeBerry Global, Inc.
InventorsJonathan Eickhoff, Ryan Dewig, Jeffrey A. Mann, Roy E. Ackerman, Dan Eichelberger, Holden W. Barnes, Zachary L. Baughman, Kody A. Chapman, Daniel O. Davis
Life of this patent
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Abstract
A method for forming an article includes providing a sheet of material, optionally conditioning the sheet with a surface of a roller, forming the sheet to provide a web, and separating an article from the web to provide the article. An apparatus adapted to form the article from a sheet is provided.
Claims20
A method of providing an article, the method comprising
- providing a sheet comprising polymeric materials,
- conditioning the sheet with a surface of a rotating roller and the surface of the rotating roller has a surface roughness of greater than about 80 Ra (microinches) and less than about 380 Ra (microinches),
- rotary thermoforming the sheet onto a mold to provide an article-blank web,
- cutting the article-blank web to form a carrier web and an article preform coupled with the carrier web after molding the sheet, and
- separating the article preform from the carrier web to provide the article,
- wherein the polymeric materials comprise polypropylene and the article has a thickness of between about 0.010 inches and about 0.012 inches and is within three sigma of a gram weight standard deviation of 0.050 grams or more and 0.110 grams or less.
3 more elements
A method of providing a thermoformed article, the method comprising
- providing a single-layer sheet comprising polymeric materials comprising a polypropylene impact copolymer,
- conditioning the single-layer sheet with a surface of a rotating roller having a surface roughness of greater than about 100 Ra (microinches) and less than about 400 Ra (microinches),
- thermoforming the single-layer sheet onto a mold to provide an article-blank web having a plurality of article blanks formed therein after conditioning the single-layer sheet, and
- cutting the article-blank web after thermoforming the single-layer sheet to provide the thermoformed article, and
- wherein the thermoformed article has a surface roughness that is less than the surface roughness of the surface of the rotating roller.
2 more elements
A method of providing a thermoformed article, the method comprising
- extruding a sheet comprising polymeric materials,
- conditioning the sheet with a surface of a rotating roller having a surface roughness of between about 100 Ra (microinches) and about 400 Ra (microinches) to block axial and circumferential movements of the sheet relative to a longitudinal axis of the rotating roller,
- rotary thermoforming the sheet onto a mold to provide an article-blank web after conditioning the sheet without applying a positive pressure to the sheet opposite the mold during the rotary thermoforming stage, and cutting the article-blank web after rotary thermoforming the sheet to provide the thermoformed article,
- wherein the thermoformed article has a surface roughness that is less than the surface roughness of the surface of the rotating roller.
1 more element
Dependencies are inferred from the claim text.