Single and double bubble tubular film extrusion of polyethylene 2, 6-naphthalate (PEN)

2000 ◽  
Vol 40 (5) ◽  
pp. 1122-1131 ◽  
Author(s):  
Kwangjin Song ◽  
James L. White
Keyword(s):  
Double Bubble ◽  
Film Extrusion

Dynamics and Stability of Double Bubble Tubular Film Extrusion

1992 ◽  
Vol 7 (1) ◽  
pp. 38-43 ◽  
Author(s):  
H. J. Kang ◽  
J. L. White
Keyword(s):  
Double Bubble ◽  
Film Extrusion

scholarly journals Biodegradable Polymer Compounds Reinforced with Banana Fiber for the Production of Protective Bags for Banana Fruits in the Context of Circular Economy

Agronomy ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 242
Author(s):  
Pablo Bordón ◽  
Rubén Paz ◽  
Carolina Peñalva ◽  
Gisela Vega ◽  
Mario Monzón ◽  
...  
Keyword(s):  
Circular Economy ◽  
Environmental Problem ◽  
Ecotoxicity Test ◽  
Banana Fiber ◽  
Film Extrusion ◽  
Blown Film ◽  
Blown Film Extrusion ◽  
Environmentally Friendly Process ◽  
Test Requirements ◽  
Better Than

Bags used to protect and accelerate the ripening of bananas are a clear example of the environmental problem of packaging waste. Small pieces of these non-biodegradable bags are frequently disposed on the soil by accident (environmental conditions and poor handling during the harvest) and remain there for years. This work focuses on the development of protective biodegradable bags reinforced with banana fiber, obtained from waste of the banana plants, thus promoting a circular economy and a more environmentally friendly process. To achieve this, different bio-based composites were tested (processability) by compounding extrusion (biopolymer and banana fiber with different process steps) and blown film extrusion. The bags produced were tested in field and sequentially improved in three generations of biofilms. The results showed that the maximum processable fiber content was 5 wt %. Additionally, the micronizing of the compounds was crucial to simplify the blown film extrusion and improve the smoothness of the bags (scratches avoidance on the banana surface). The final bags (Mater-Bi biopolymer, 5% combed and sieved banana fiber, and 2.5 wt % TiO2 for ultraviolet light filtration), performed better than the conventional ones (faster maturing, i.e., earlier harvest, and easier handling) and fulfilled the biodegradability, composting and ecotoxicity test requirements.

scholarly journals Polyurethane-Coated Implants for Prevention of Double-Bubble Effect in Breast Augmentation

2021 ◽  
Vol 7 ◽  
pp. 2513826X2110289
Author(s):  
Vitali Bagirov
Keyword(s):  
United States ◽  
Breast Augmentation ◽  
Cosmetic Surgery ◽  
The United States ◽  
Treatment Result ◽  
Lower Pole ◽  
Common Complication ◽  
Breast Volume ◽  
Double Bubble ◽  
Growing Body

Breast augmentation is the most frequently performed cosmetic surgery in the United States, with approximately 279,000 patients every year. The so-called double-bubble effect (DBE) is a common complication in breast augmentation. This complication is characterized by folds running along the lower pole of the breast, forming distinct bubble-like protrusions above and below the fold. Factors that increase the risk of DBE include bulbous breasts and a large native breast volume. There is evidence that polyurethane-coated (PU) implants may help to reduce the risk of DBE. We describe here the case of a 47-year old patient for whom DBE has recurred in each of 4 tandem breast surgeries. PU implants ultimately appeared to prevent the DBE, leading to an aesthetically satisfying treatment result for the patient. This case adds weigh to the growing body of evidence that supports the use of polyurethane implants to prevent DBE.

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