Ovenable Tray

DOT is used for frozen foods. They have been a major outlet for plastics. In the past thermoset plastic materials were used but it practically all went to thermoplastics such as CPET. 

Plastic ease of processing with low cost have given them a wide application in solving problems in electronic packaging. They range from inexpensive consumer devices to sophisticated expensive computer systems and cellular phones. 

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General Electric now also offer polyetherimide-polycarbonate blends. Although these materials are not transparent and have a lower specification than the basic polyetherimide, they are less expensive and find use in microwave oven trays and automotive reflectors. 

The non-toxicity of aluminium coatings and freedom from taste or taint means freedom from health hazards during application and provides hygienic finishes for contact with foodstuffs, e.g. baking tins, oven trays, containers. 

Bottles for carbonated soft drinks, 60% custom containers for products other than carbonated soft drinks, 30% amorphous (packaging) and crystallized (microwave and oven trays for frozen foods), 10%... 

Spread mass as small pancakes onto oven trays and dry at 50°C for approximately 14 hours. 

Change from one type of drying process to another (e.g., oven tray, fluid bed, microwave). 

Mean drying time for the oven tray process is 19.2 hr. All 15 batches were dried within the specified time of 16 to 20 hr. No seasonal influence was apparent. The average moisture content of these batches is 1.2% the standard deviation is 0.3%. The 15 batches dried using the fluid bed dryer had a residual moisture of 0.8% (SD = 0.1%). Drying time is mechanically controlled and not recorded. The statistics favor the fluid bed process it is more efficient and uniform. There is nothing in these data to disqualify the oven tray dryer from further use, however. 

Table 2 Drug A Comparison of Oven Tray Dryer and Fluid Bed Dryer Processes...

Test Oven tray process (x) Fluid bed process (x)... 

In contrast to the conventional oven, the surface temperature of food in the microwave generally does not exceed 100° C. Therefore, partition coefficient of the volatiles would be different from that in the conventional oven, which indicates the probability that the volatiles emitted from an ovenable tray during cooking may be transferred to the food contents. 

Dnal-ovenable trays Highest intended conventional oven temperature for the longest time... 

DFMA design for manufacmrability/ assembly DOT dual-ovenable tray... 

Preheating can be done in ovens, tray dryers, and hopper dryers. Hopper dryers offer the advantages of reduced handling and less possibihty of contamination and keep the material hot in the machine hopper. The use of dehumidified air is preferable, particularly when high-humidity conditions exist. 

One disadvantage of SPPF is the level of residual stress and orientation remaining in the final product. This arises from stretching the sheet prior to its softening point. The presence of greater orientation enhances the clarity and stiffness of the formed article. One undesirable consequence of this, however, is the unsuitability of SPPF in the production of containers for high temperature applications. If used at elevated temperatures, e.g. in microwave oven trays, the frozen-in orientation and stresses have an opportimity to relax, causing distortion of the container. 

However, systems designed to handle smaller parts may well utilize batch-type ovens. Trays or carts loaded with assembled parts are transported to the oven and cured in a group. Such ovens are usually the simplest way of providing the necessary heat, and production rates can rival conveyorized systems. 

GE Plastics Ultem Applications Food handling, medical, machinery parts, electrical components, microwave oven trays. PEI... 

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