Stock material or miscellaneous articles – Structurally defined web or sheet – Including aperture
Patent
1996-06-17
1997-12-16
Raimund, Christopher
Stock material or miscellaneous articles
Structurally defined web or sheet
Including aperture
442394, 442398, 442412, 15624418, 15624427, B32B 310
Patent
active
056982909
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to novel and improved paper for packaging food which packages cooked food and can be re-heated by a microwave oven, etc, while packaging the food, and a method of producing this packaging paper for food.
BACKGROUND ART
It has been the fashion these days to purchase cooked food items to take them back home and to serve them by re-heating. Various containers have been used in the past for transporting and preserving the cooked food, but in the case of the food which generates vapor after cooking such as cooked rice, the vapor condenses on the cover of the container, and the water droplets so formed adhere to the food and deteriorate taste and flavor thereof.
An inner lining sheet for a food container, which can prevent the vapor generated during transportation and preservation of food from condensing on the inner wall surface of the container and again adhering to the food, a sheet for microwave heating, which enables the packaged food to be heated again by a microwave oven, food packaging materials for the same purpose, etc, have been proposed in the prior art references such as Japanese Patent Laid-Open No. 3-289455/1991, Japanese Patent Publication No. 3-14709/1991, Japanese Utility Model Laid-Open No. 3-108671/1991, and so forth.
When cooked food is stored in a container, it has been customary to put a sheet having hygroscopicity on the inner wall surface of the container or to cover the surface of the food with such a hygroscopic sheet so as to let the water droplets condensing on the inner surface of the container be absorbed by the sheet. However, when the end portion of the hygroscopic sheet put on the inner wall surface of the container deviates to expose portions where the inner wall surface comes into direct contact with the food, or when the hygroscopic sheet covering the surface of the food is not in its proper position to expose the portions of the food surface, the water droplets condensing on the wall surface are likely to adhere once again to the food at such portions.
Deviation of the hygroscopic sheet can be eliminated if the sheet is shaped into a bag shape in conformity with the shape of the container, but when the hygroscopic sheet does not have heat sealability, bag-making is troublesome and time-consuming. Therefore, an attempt has been made to bond a synthetic resin film having good heat sealability to the inner surface of the hygroscopic sheet. However, because the vapor condenses on the film surface, pores must be bored either mechanically or electrically in the entire surface of the film so as to permit permeation of the vapor.
When paper made of wood pulp is used as the hygroscopic sheet, high moisture-permeability and high hygroscopicity can be obtained. However, if paper is wetted by absorbing water, the pulp fiber is likely to peel and to contaminate the food when the wetted portion undergoes friction as the food is moved to other positions.
In the case of the cooked food which generates the vapor after it is put into a bag, is taken back home and is heated again by the microwave oven, the vapor condenses on the inner surface of the bag, and the resulting water droplets are likely to adhere again to the food or to establish a high moisture state inside the bag, and to deteriorate the taste and flavor of the food. Therefore, there remains the problem that the food must be taken out from the bag and placed into another container and be again heated.
Particularly in recent years, cooked food such as cooked rice has been centrally cooked and distributed to chain eating places, hotels, restaurants, supermarkets, convenience stores, schools, companies, etc, and the sale of the cooked food has become more and more popular. For this reason, paper for packaging food free from the problems described above has been earnestly required.
DISCLOSURE OF THE INVENTION
It is therefore an object of the present invention to provide novel and improved paper for packaging food, which is free from deterioration of the taste and flavor of the food due to
REFERENCES:
patent: 4935276 (1990-06-01), Pawlowski et al.
Fukushima Takashi
Tadokoro Mikio
Eiwa Kagaku Kogyo Kabushiki Kaisha
Raimund Christopher
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