freezing food
freezing food
ECONOMIC APPRAISAL

I note that some of the new freezer developments in both Europe and the United States are using temperatures as low as minus 60 degree C. in a air-blast system and minus 65 degree C. in a drum system. In this extremely interesting and important matter of applying new freezing techniques; we may well find that the old cliche that coil temperatures below minus 40 degree C are uneconomical is no longer true when the alternatives of instant freezing are considered.

Selling Prices of the Frozen Product. This factor has two sides: (1) the relative value of the product - the higher the value, the more that can logically be spent on processing -- and (2) the amount of improvement the buyer is willing to pay for.

Most frozen fruits and vegetables sell for 5 to 10 cents a pound. High - cost freezing methods may be difficult to justify unless there is no alternative to get the desired quality. On the other hand, an improvement in quality might be easy to justify in fish and meat products, many of which are worth a dollar or more a pound, even though the process adds several cents of cost.

The amount of improvement a buyer is willing to pay for involves both real and imagined benefits. For example, the color of frozen turkeys within a fairly wide range has no apparent effect on product quality. Yet because of consumer preference, a bird with a certain color may be sold at a premium price. A somewhat more costly process to produce this color can be easily justified.

Someone defined quality as "that for which a customer will pay more because of its presence." The key to that statement in the economic world concerns the customers willingness to pay. To produce a better quality at a higher cost is futile unless the customer will pay that additional cost. Too often, however, buyers are not willing to pay for as good quality as processors are able to deliver. This may not even involve instant freezing. It may just be "case-freezing" to save a few cents a case instead of freezing in individual cartons or in bulk. In a market where price is an excessively dominant factor, little encouragement exists to improve the product. -About all the processor can reasonably do is to produce the best product the buyer is willing to pay for.

Losses in the Process. Losses in freezing occur from evaporation and from actual loss of pieces dropping from conveyors and becoming enmeshed in or stuck to belts, conveyors, elevators, or other machinery. Freezing in packages should avoid most of the losses. I doubt that these losses, percentage wise, are very large in a well-run operation.

Evaporation losses have loomed large in the battle between cryogenic and air-blast freezing of products in bulk. Just how important these losses are seems to depend, in the propaganda stage, on what one is selling. But let us try to remain objective and see what the facts are.

Evaporation losses, according to one equipment manufacturer, are largely
determined by two factors: (I) difference in vapor pressure between the product being frozen and the freezing medium, and (2) length of time the product is subjected to the freezing medium.

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