HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Blogs
Engineering Materials

Photodegradable Plastic Bags--Yes, They Are Bad

NO RATINGS
View Comments: Oldest First|Newest First|Threaded View
ejw
User Rank
Iron
I beg to Differ: You are confusing bio and photo degradable!
ejw   1/6/2012 10:50:03 AM
NO RATINGS
Hi Doug,

Your post is interesting, but I am afraid that you are confusing bio-degradable bags and photo-degradable bags.  Thus there are some factual errors in your article.   Photodegradable bags, such as ECOgrade bags, are not bio-degradable, and therefore do not have the issues associated with your comments.  Specifically, 

1)   Plastics have value as recovered commodities,

AGREED:  Certain photo-degradable bags, such as ECOgrade, can be recycled, and therefore maintain this value.

2)   The biodegradable additives don't reduce the carbon footprint of packaging,

TRUE FOR BIODEGRADABLE, BUT NOT PHOTODEGRADABLE.  Photodegradable bags contain 46% less plastic resin, and produce 34% less Greenhouse Gas in preproduction, as well as use less energy in manufacture.  They do not produce GHG upon degradation.

3)   The degradable additives jeopardize recycling streams, and

NOT TRUE FOR CERTAIN TYPES, SUCH AS ECOGRADE.  ECOgrade does not contain toxins that jepordize recycling, and do not degrade once mixed in the recycling stream

4)   They will not solve the littering problem.

Depends how you define this.  We all beleive people should not litter.  But if littered, photodegradable bags will degrade and go away, minimizing risk to wildlife and the resulting "urban tumbleweed"

The European Plastics Recyclers Association don't address the issue of the degradability of plant-based plastics, which may reduce the carbon footprint of packaging, but have  the additional problem of pulling corn, potatoes and other plants from human food supply.

AGAIN, THIS IS BIO-DEGRADABLE:  Photodegradable bags do not contain corn, potatioes, and other food items.

THiese are common confusions, and misspercetions.  I hope this clarification helps clear this up.  For more information you can view FAQs at http://www.gxtgreen.com/page/menu_3/12908.html

 

Partner Zone
More Blogs from Engineering Materials
Artificially created metamaterials are already appearing in niche applications like electronics, communications, and defense, says a new report from Lux Research. How quickly they become mainstream depends on cost-effective manufacturing methods, which will include additive manufacturing.
SpaceX has 3D printed and successfully hot-fired a SuperDraco engine chamber made of Inconel, a high-performance superalloy, using direct metal laser sintering (DMLS). The company's first 3D-printed rocket engine part, a main oxidizer valve body for the Falcon 9 rocket, launched in January and is now qualified on all Falcon 9 flights.
A new thermoplastic composite for high-speed, high-volume injection molding has tensile strength that's close to, and sometimes better than, either lay-up composites or metals.
Lawrence Livermore National Laboratory and MIT have 3D-printed a new class of metamaterials that are both exceptionally light and have exceptional strength and stiffness. The new metamaterials maintain a nearly constant stiffness per unit of mass density, over three orders of magnitude.
Smart composites that let the material's structural health be monitored automatically and continuously are getting closer to reality. R&D partners in an EU-sponsored project have demonstrated what they say is the first complete, miniaturized, fiber-optic sensor system entirely embedded inside a fiber-reinforced composite.
Design News Webinar Series
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
7/17/2014 11:00 a.m. California / 2:00 p.m. New York
6/25/2014 11:00 a.m. California / 2:00 p.m. New York
5/13/2014 10:00 a.m. California / 1:00 p.m. New York / 6:00 p.m. London
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Aug 18 - 22, Embedded Software Development With Python & the Raspberry Pi
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: September 30 - October 2
Sponsored by Altera
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service