Foamed PET Sheet Tackles New Markets.
It finds a successful niche in a heated molded bakery tray, meat tray, and reheated dinner tray to deliver home to the disabled.
But from the beginning of 1990, probably not more than half.
In fact, more than a dozen processors around the world have been able to make paper commercially. -
Some of them later withdrew.
Two obstacles are the difficulty of foaming PET into a consistent sheet product, as well as the difficulty and cost of reusing the large amount of foam waste left by thermoforming.
Now, the new foam PET products are being developed for the first time in years, including thicker flakes with higher density and thinner films with very low density.
Developing applications is exploring new
Packaging markets such as automobiles, construction and defense. \"High-
Insulation of temperature pipes in cars and sound insulation and insulation are some potential uses, \"said Gary Boone, senior technician.
Eastman Chemical Service representative
Eastman is a reactive additive, Eastolite E303192AA, which increases the melting strength of PET and contributes to foaming.
First Business America early questionS.
The product is from Ultra Pac in 1993 (
Ivex Ultra Pac now)
Rogers in Minnesota, using high-I. V.
Petlite resin from Shell Chemical
On the Welex single. screw extruder.
But two years later, Ultra Pac\'s foam pot stopped production.
The difficulty lies in the cost of processing foam waste, which accounts for about 50% of the initial sheet after thermoforming.
Even after compaction and re-granulation, the foam scrap will still bubble when re-formingextruded. Houston-
Mossi & Ghisolfi-based companies later acquired Shell\'s pet business and abandoned Shell\'s Petlite resin to support M & G\'s own highI. V.
Pet, called Cobifoam.
* 91 * today, the only known pet business foamer in the United StatesS.
Is Genpak LLC in Lancaster, USAC.
After five years of research and development, the foam PET was commercialized in 1998 (PT, Sept. \'00, p. 100).
Genpak produces foam ovenable CPET bakery trays, meat trays and more
Compartment tray for familydelivery meals.
Trademark PET, tray density from 0. 15 to 0. 35 g/cc.
Genpak is also developing very low now.
Density foam for durable applications such as automotive components.
Genpak patented the use of N-gengane as a foaming agent because its high boiling temperature produces gas pressure at the processing temperature of PET at 480 F, which matches the typical blowing pressure of PS
Genpak found that, on the other hand, nitrogen and carbon dioxide create excessive pressure on the mold, resulting in poor foam ripple and surface quality.
Genpak is able to re-process foam scrap using Eastolite E3031
92AA active chain extender or \"support agent\" to restore the original I of the resin. V.
* 92 * durable goods in research and development \"we are looking for automatic motivational applications for a lot of foam PET,\" said John banbala, President and CEO of Sentinel productsHynes, Mass.
Has been working on a new series of PET foam for 18 months.
\"We have eight or nine companies that have non-disclosure agreements on pet Bubbles.
A major durable application of PET foam in development is the headline of thermoformed cars.
\"For this application, Sentinel is developing 0. 2-in. -
Thick film of 0.
Sentinel said it is being tested by European and Asian companies.
Sentinel manufactures and develops PET foam from 0. 007 in. up to 0. 2 in.
Thick on DavisStandard twin-
Screw extruder with ring mold (see PT, Aug. \'00, p. 34).
Foam PET samples thicker than 0. 2 in.
A European company is making it for Sentinel. Very thin (0. 007-0. 008 in. )
Foam paper is printable and a barrier to most chemicals.
\"Some applications in this area are huge --
Such as envelope liner and label. One patent-
The application density of the pending barrier of the foam PET plate is as low as 0.
05g/cc, only 0. 2-mm cell size.
Sentinel\'s PET foam technology uses reactive additives to slightly cross-link PET, improve the melting strength of PET, and combine additives with other polymers into PET.
\"With the PET foam, we only had a little cross-linking,\" bamboos noted . \".
The Sentinel blows the foam with a mixture of CO2, nitrogen and other gases.
Sentinel proposes to sell gas feed and mixing devices to other foamers.
Sentinel also applied for a technical patent for thermoforming thicker foam.
Sentinel is working with Irwin R & D.
Wash in Yakima.
Develop thermoforming equipment.
At the same time, M & G began to develop data on PET foam strength of different thickness and density in Akron, Ohio, to characterize the foaming grade.
The development of Europe although all the commercial foam PET in the United StatesS.
At present, most commercial foam PET in Europe uses physical foaming agents (CBAs).
Chemical reagents usually reduce the density of pets by 40-About 50% to 0. 7-0. 8 g/cc.
CBAs may also damage the recyclability of waste materials.
If too much CBA concentrate is used, the undecomposed foaming agent will affect the later processing.
Some European bubbles
Paper waste is not reused but sold to the manufacturer of PET fiber filling.
BC foam srl is working on Thick PET foam board in Volpiano, Italy, a recently established manufacturer of coroting twinScrew extruder.
BC foam formed by the former principal of LMP Impianti has produced commercial quantities of heated PET plates using ring molds and squeezed PET foam plates up to 2. 5 in.
The BC foam is expected to bring the foam to 4 in.
Thick, low density to 0. 047 g/cc.
A foam board being developed for military applications is 0.
Thick foam has difficulties in cooling and maintaining uniform bubble distribution.
The thick foam makes the mold temperature over 390 degrees Fahrenheit and then cools very quickly outside, but it cools very slowly inside.
BC Foam has just made its first twin.
Screw thread for foam PET sheet.
The system can be used including nitrogen, CO2-134, or HFC-152.
\"Industrial application business activities in Europe and Asia are at an advanced stage,\" said technical director Alberto Bruschieri . \".
European packaging processors have also made thinner foaming PET (
APET and CPET)
Used with five-
Layer coex film with six-or extrusion coatinglayer barrier.
The resulting seven
Layer structure of PET foam tie beltPE-tie-EVOH-tie-
PE is usually 13. 8 to 19.
7 thick mil, reducing the weight in the thermoformed meat tray
Commercial processors include Akerlund & Rausing in Sweden and Wihuri wiipak in Finland.
The British Petroleum and Chemical Company PlasTec GmbH conducted a bubble CPET test in Germany, and there should be commercial products in six months.