JPH04502087A - Microwave-safe double bag food container - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Double bag type food container that can be used in the microwave [Technical field] This invention is a food-use product whose contents are heated by microwave radiation. Regarding the package. More patentably, this invention applies to raw, cooked or is semi-cooked food1. and vegetable oils, animal fats, butters and oils, usually in solid form. , related to food packaging used in shortenings such as hydrogenated oils, etc. do. More particularly, the present invention provides a microwave sensitive heating element. packaging for kernels, oils, or shortenings. Main departure A preferred embodiment of the invention is a synthetic package comprising a lined and/or paper outer container. Including bags. The outer surface of the lining, or the outer surface of the outer container or A micro-reactive heating element is inserted so that it touches the inner surface.

[Background technology] Heating or cooking food in a microwave oven As a kitchen utensil for cooking, and also suitable for microwave heating and cooking of food. paper or plastic boxes and bags for use as packaging for A variety of containers have been developed, including bags. These containers are not mentioned in this specification. European Patent Application Publication No. 256.791.

Some existing containers contain heating elements that are extremely sensitive to microwave radiation. This ensures that only a few selected parts of the container are exposed to high temperatures. It is. Heating elements are, for example, metal particles, usually made of aluminum. vacuum welded onto a polyester film and the resulting metallized film is laminated onto paper or cardboard. The metal-coated paper or metal thus obtained If food placed inside coated cardboard or packaging containing this type of cardboard is It is placed in a Kuronami oven, grilled, and scorched. Such a structure Although the structure is extremely effective as a heater, it is possible to create a metal-coated film using the vacuum evaporation method. creating coatings in specific areas of the carton or selecting finished cartons or structures. different amounts of metal particles or coated with a metal coating. It is difficult to use vacuum welding to do this.

Another way to make microwave-responsive heating elements is to Separate particles that are microwave energy absorbers, such as carbon, metals, and alloys. There is a process of dispersing the dispersed particles and constructing a sheet or laminate containing the dispersed particles. . The heater disclosed in Turpln Patent No. 4.190.757 is Carbon, iron, and various metal oxides in an inorganic binder such as sodium silicate. A granular loss of material such as a material contains a layer of material. Ba1la American Patent N o, 4.269,668 is a carrier layer, e.g. paper, cardboard, or A layer of plastic material, an outer layer of thermoplastic material, and a laminate between the two. A heating element consisting of a layer of carbon black in an acrylate binder Disclosed. European Patent Application Publication No. 242.952 relates to insulating materials Processed metal or alloy in the form of flakes in a thermoplastic insulating matrix A thermal element is disclosed.

[Disclosure of invention] The present invention provides a method for coating paper, polyester, or cardboard that forms part of a package. or printed microwave-interactive compositions.

Preferred embodiments of the invention include an inner bag made of oil-resistant paper or polyester film. consisting of an outer bag made of paper with a lining or lining, and on the outer surface of said inner bag. or other integral or uniform microwave application on the outside or inside surface of the bag. Contains a multilayer bag with a thermal element. This microwave heating element Conventional coating or printing methods can be used to coat certain surfaces of the bag or Consists of a microwave-reactive coating applied directly and appropriately to a suitable material. Ru. According to a preferred embodiment of the invention, the microwave-responsive coating This microwave-sensitive coating can be applied to , may be applied directly to the inner or outer bag or to the outer surface of the container. .

Suitable microwave interactive coating compositions are described by Kenneth A., Po. Publicly Assigned Pending U.S. Patent Application No. 07/ No. 239,544, and is also discussed below. certain good Suitable coating compositions include carbon black, at least one finely divided metal Alternatively, it consists of a metal oxide, a clay, and an insulating solid organic binder in a medium.

[Example] FIG. 1 is a perspective view of a bobcorn bag or similar food container.

FIG. 2 is a perspective view of the opposite side of the bag shown in FIG. 1;

FIG. 3 is a perspective view of an empty bag according to a preferred embodiment, with a portion removed; , showing the printed microwave heater element with its internal structure.

Figure 4 is a cross-sectional view of one end of a bag containing a cardboard carton of the type shown in Figure 1; Ru.

FIG. 5 shows the printed microwave used in the microwave-cookable food container of the present invention. A preferred pattern for a reactive heater element is shown.

FIG. 6 shows typical heater sensitivity in a heating element made according to the present invention. It is a graph showing the state.

1 and 2, these include pre-filled food containers of the invention, such as bob corn. Bag 5 is shown. This bag has 6 front sides, 8 back sides, and sealed sides. Consists of 10 people. The top end of the front side 6 of the bag 5 is sealed to the back side 8 of the bag. Good too. This bag has a gusseted side plate 15. C extends from the top of the bag to the conventional bottom portion 17. As shown, Bucone and oil are 1. Fold line 18. . Can be placed in the middle of the bag between 19 . Print heat 27, which will be described in detail later, is a package adjacent to the bob cone. within the area.

Figure 4 shows three food filled container bags packaged for sale and delivery to customers. A package 20 made of cardboard is shown. As shown, the food load, e.g. Bucorn and oil 21 are placed in the middle part of the bag and in both end parts. food is food It is also inserted into the foldable top part 12 and bottom part 17 of the spine part, and the package is A compact unit is constructed for this purpose.

FIG. 3 shows a preferred embodiment of the bob corn bag of the present invention. , <show. This bag The container consists of an outer paper bag 25 and an inner bag made of oil-proof paper or polyester. In other words, it consists of lining 02G, and this lining is welded or glued to the valley side bag. You can also laminate it.

This one example 1. ．． ．． ', the micro-microwave heater 27 is connected to the paper outer bag 2. It is printed as a solid line pattern on the inner surface of 5. preferred alternative The data pattern is shown in FIG. As shown in Figure 5, the print heat data has a certain pattern. The preferred grid pattern shown in FIG. It has an open unprinted area that is almost equal to the printed area. this putter The tube is designed to evenly distribute the heat generated in response to microwave radiation. ing. Other continuous patterns i.e. continuous polygons, continuous circles, lace patterns etc. can also be adopted.

Although typical examples of the microwave reaction package included in the present invention have been shown, the present invention The invention is not limited only to the specific structures described and shown above and below. It is clear that this is not the case. For example, the heating element is not necessarily It does not need to be applied directly to one surface, but to any suitable substrate such as paper, polyester, etc. applied and then inserted into the package or affixed to the desired location on the container. Good too. According to other embodiments not shown, the heating elements shown in FIGS. It may be included in the bottom 17 of any type of bag or printed on the bottom 17 of the bag. stomach.

According to one particular example, when cooked it typically has a volume of 2500 cubic centimeters. Suitable for bob corn bags containing inflated 70g corn kernels. The lint heater has a total area of approximately 25 to 35 square inches (approximately 160 to 225 square centimeters). H) is made into a rectangle or rectangle. Preferably, this heater is as shown in FIG. The weight of the coating in the second case is 30 Within the range of about 0.5 to about 8 bonds per 00 square feet ream.

Alternatively, the heater may be printed in a solid batch as shown in Figure 3. However, the weight of the coating in this case ranges from about 0.5 to about 8 pounds per ream. enter the enclosure.

Test results show that energy radiation caused by microwaves causes The temperature of the heat is determined by a solid batch code rather than a discontinuous pattern, such as a lattice pattern. This means that the coating will be more uniform.

Gravure press at a rate of 85, IH, 135, and 175 lines per inch. The printed heater with the solid batch coating shown in Figure 3 is rated at 700 watts. It was suitable for bursting corn kernels in a microwave oven.

Plates printed by gravure printing machine at 85 and 100 lines per inch Child pattern heaters use sleds that have less tendency to form "hot spots." It has better performance than a printed pattern heater.

Others, not shown, include interconnected concentric circles, basket weave patterns, etc. This pattern is also a variation of the illustrated grid pattern and is within the scope of the invention. .

As set forth in commonly assigned pending patent application No. 07/239.544. The preferred printing composition includes carbon black contained in a suitable carrier extrusion. , consisting of finely divided flaky aluminum, clay, and a synthetic resin binder. Suitable binder is a polymer precursor that functions as both a binder and a carrier for the remaining solid composition. Refers to an aqueous or non-aqueous solution or dispersion of a substance. print ink The binder suitably used for Bearing elements of the printable composition that make up the heater, such as black, aluminum, and clay. It can also be used effectively as a body. commonly used and commercially available for this purpose Latex material is preferred. Latex materials are preferred as binders, but non-aqueous Solvent binders, such as those available from Morton Chemical under the trade name Morez 100. The products listed below have also been found to be suitable for this purpose.

Preferred examples of heater printing compositions include those that replace microwave radiant energy with heat. It is a conductor, semiconductor, or ferromagnetic material that can be made of. For example, aluminum, tin , bronze, nickel, etc., and carbon black or graphite. This includes carbon in the form of carbon. Inert materials suitable for forming these materials Powdered solid temperature moderators include clays such as kaolin and ingrine. China clay, alumina, alumina hydrate, alumina hydroxide, aluminosilicate These include salt, silica, calcium carbonate, and titanium dioxide. A temperature moderator is required. Naturally inert and only slowly or almost insensitive to microwave radiation must be responsive. A suitable binder is a synthetic resin or the like in a suitable carrier. This is especially the case with Bolylatex materials, which are marketed specifically for this purpose.

The weight ratio of metal to carbon in the composition ranges from about 1:2 to about 2:1; A further preferred range is about 1:1.5 to 1.5:1. against aluminum flakes A preferred carbon black ratio is about 0.6. Inert temperature moderation in compositions The proportion of data components, such as clay, is based on the total weight (dry base). The content ranges from about 10% to about 35% by weight.

The ratio of binder solids to the remaining solids making up the heater composition is about 0. It may be within the range of 1:1 to 1:1. from about 30 to about 30% by weight of the total composition Binder solids ratios in the range of 40% by weight are generally acceptable. solid in sufficient quantities to ensure bonding of the coating components to each other and to the substrate. It is better to use a binder.

In a preferred embodiment, the microwave reactant comprises a clay as a moderator. The whole is a mixture of carbon black called pigment and aluminum flakes. , the binder is acrylic emulsion, and the weight ratio of this pigment to binder is should be about 2 to 1 or greater.

The weight ratio of carbon black and aluminum flakes does not significantly affect the temperature response. It can be varied within a range of approximately 2:1 to 1:2.

Other substances, such as surfactants, dispersion aids, and other materials used in coatings and printing systems. rotogravure printing or other suitable printing methods or coatings. Conventional additives convenient for applying coating compositions to substrates by coating methods can also be employed as this coating composition. Coating can be done by traditional printing or and coating methods, such as rotogravure printing blades, silk screen methods, and coating methods. It is formed using a xo-printing method, an air knife method, a roll method, a blade method, etc. Ko When coating compositions are applied, typically sheet printing and coating methods The coating is dried using a conventional drying oven used in the industry.

The test results presented below demonstrate that specific embodiments of the present invention meet the needs of various customers. It shows the variations in composition and coatings that can be tailored to suit different needs.

In the examples below, all coating materials were applied using a bird applicator. 40 bond weight per aooo square foot, uncoated. Applied to bleached, kraft paper, photo-dried at 200 degrees F. Unless otherwise specified, the binder used was Acrylic latex Roblex B-15 supplied by de Haas, Styrene, supplied by Morton Chemical Co., and commonly used in aqueous printing inks. It was a combination with acrylic latex Luciden 602.

In all cases, carbon black is added to the latex material (using a shot mill). It is dispersed in some or all of the Lucidine 802 binder used. this Water is replenished as needed to obtain the desired viscosity. Carbon black is evenly distributed. Once uniformly dispersed, it is transferred to a container equipped with a propeller-type mixer. remaining vine (Lucidaine 602 and/or Lawlex B-15), and the rest The elements are added in portions as needed along with water.

In each case stirring is continued until a homogeneous mixture is obtained. these The response of the coating to the heater is determined by the printing bag at Lltton. ) I decided to put it in a microwave oven (model number 2231+, rated at 700 watts). More determined. Samples were placed on a glass ring 2 inches from the bottom of the oven. The temperature response was measured using a Hughes Probeye server. IIFJ was determined using the Maruvideo system.

In typical cases such as bob corn bags, printed heaters are Microwave interactive cores of the present invention using partial coverage patterns such as corns. temperature response for a given load requirement to the desired level. You can get something. For example, while minimizing the number of uncooked corn kernels, Cook a large amount of bob corn, keeping the paper bag from burning as much as possible. It is easy to determine the weight of the coding that will produce the required temperature response. It's simple.

A pattern coating, such as a grid pattern, covering 35-80% of the heater surface area. The turns typically have a desired temperature response throughout the print area. Desirably is the area of the area covered by the coating that makes up this pattern, It is within 40 to 70% of the heater area.

example One microwave interaction coating composition contains 19% by weight carbon black. , 27% by weight aluminum flakes, 18% by weight 4 kaolin, and 34% by weight The binder is prepared using a binder such as Lucidene. 1:2 mixture of nr) 602 and Rhoplex B-15 made from.

Latex material solid carbon, viscosity, surface tension is 250 ft/min full scale Necessary for achieving excellent flowability (runnability) in gravure printing presses. Adding water, alcohol, carboxymethyl cellulose in viscosity adjusted by. The test piece of the heater was printed on a printing line as shown in Figure 5. Using a pattern of 1.8 mm width and 4.5 mm square opening, draw 25 squares on paper. Created by rotogravure printing on a square inch. Thus, about 50% Area coverage by the heater composition is obtained.

This test specimen has the following specifications.

coating weight Sample Printing machine lb/3000 square feet x 85 line screen 7 ．． 1 gravure cylinder Y100 line screen 3,8 gravure cylinder Z133 line screen 2,5 gravure cylinder Heater response test was performed at 700 watts with and without load. Performed in a crowave oven.

The test results are shown in Figure 6, where x, y, and z are for the no-load condition. Indicates the test of the specimen at 200g of water load. The test results when using the same heater are shown. From Figure 6, the ratio possible with this heater is It can be seen that a uniform temperature can be obtained over a relatively long period of time.

international search report

Claims (15)

[Claims] 1. Moisture- and oil-proof inner linings of containers, paper outer containers, surfaces of container elements Includes microwave reactive heating element coatings applied directly to, not required Paper food containers that can store food for long periods of time without loss of missing elements. 2. The inner lining contains polyester and the microwave reactive heating element contains polyester. 2. A food container according to claim 1, wherein the food container is applied directly to the outer surface of the plastic lining. 3. The outer container is a paper bag, and the lining or container is glued to the inner surface of the outer bag. The food container according to claim 1, which is a polyester film made of polyester. 4. The food product of claim 1, wherein the heating element is applied directly to one surface of the outer container. container. 5. Claim 1: The heating element is applied to an insert between the inner lining and the outer container. Food containers listed. 6. 2. The heating element according to claim 1, wherein the heating element is applied directly to the lining or outer surface of the container. food container. 7. The food product of claim 1, wherein the heating element is applied directly to the inner surface of the outer paper container. product container. 8. A food container according to claim 1, wherein the heating element is applied directly to the outer surface of the outer container. vessel. 9. Microwave heating elements are made of finely divided carbon, flakes or powder. 2. The container of claim 1, comprising aluminum, clay, and a resin binder. 10. The ratio of binder solids to other solid elements is within the range of about 0.3 to about 1. 10. A container according to claim 9. 11. 10. A container according to claim 9, wherein the heating elements are applied in a continuous pattern. 12. 12. A container according to claim 11, wherein the pattern is a grid. 13. 4. The patterned area comprises about 0.2 to about 80% uncoated substrate. 12. The container according to 11. 14. 10. The heating element coating is applied by gravure printing method. Container as described. 15. Heating element coating is applied by flexographic printing method The container according to item 10.