JPS6387535A - Container for microwave cooking - Google Patents

Abstract

PURPOSE:To produce a properly scorched part of a food, to apply a paper package, and to prevent the generation of spark, by a method wherein a printed film of an ink composition, containing potassium titanate reductant and conductive-material particle, is formed through a surface flat layer of ink-non-impregnated resin or an inorganic material. CONSTITUTION:By irradiating a print film, being a heat generating substance, with microwaves, both heat generating effects, produced by absorption of microwaves by potassium titanate reductant, and by a resistance loss, are produced. Simultaneously a heat generating effect by an eddy current is produced in conductive material particle dispersed in the printed film, and a food is heated and a properly scorched part of the food can be produced. In the case of a conductive material particle being metallic particle which reflects microwaves, action of reflecting microwaves and heating the food is effected. A layer having a flat surface maintains a flat state even when heat generated during microwave heating is imparted, and simultaneously, a film with a uniform thickness can be formed, and spark is prevented from generation. Through selection of print concentration, sudden heating is prevented from occurring, and paper or a composite material composed of paper and aluminium may be applied as a container.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a microwave cooking container, and more particularly, it heats food and turns the outer surface of the food brown, and Saramini controls the heating. The present invention relates to a microwave cooking container.

[Conventional technology]

General: 2. Microwave ovens are a must! This method uses high frequencies of about 0 MHz to heat and cook food, and has the advantage of being able to cook quickly and hygienically, so it is widely used.

When cooking using high frequency in such a microwave oven (; means cooked food (= no brown marks).

Therefore, for example, in cases where browning is required, such as gratin, pizza pie, gyoza, etc. (Secondly, the heating method using a microwave oven using an ordinary container is not suitable.

Therefore, container walls made of heat-resistant dielectric materials such as heat-resistant glass; microwave cooking utensils coated with metal films, and container walls made of paper or aluminum foil (microwave absorber coatings such as dimagnetic powder) Microwave cooking utensils have been proposed.

The bottom of the container is also provided with a layer of conductive elemental metal (constructed in such a way that when exposed to microwave radiation, the metal layer heats up the food in the container partially (two and two) and becomes colored). In addition, it has also been proposed to form the metal layer into a thinner film by vacuum evaporation to eliminate the reflection of microwaves on the surface of the metal layer (see Publication No. ).

[Problem that the invention seeks to solve]

However, the heating method that utilizes the heat generation effect of the first resistor (heat generation due to resistance loss) is extremely difficult to use (unless the container is made of heat-resistant glass, etc., as the temperature will be high and sparks may occur in some cases). For example, it cannot be applied to paper containers.

Next (-) The second heating method that utilizes magnetic loss does not provide a sufficient temperature rise.

Furthermore, the third metal layer, which is a thin film, must be formed by vacuum evaporation technology and cannot be mass-produced at low cost. Also, it is not possible to add pattern-like (second-scorched marks) or mesh-like (= burnt marks).

Therefore, the problem that the present invention attempts to solve is the pattern (
It is possible to add double burnt marks or mesh-like or double burnt marks, and it is possible to make moderate burnt marks without burning too much or damaging the container, and it is inexpensive. To provide a microwave cooking container that can be mass-produced.

[Means for solving problems]

As a result of research to solve the above-mentioned problems, the inventor of the present invention has discovered that food products can be heated by using a printed film formed by printing using an ink composition containing reduced potassium titanate and conductive material particles as a heating element. When heated (=, it is possible to create a moderate burnt mark, it can be applied even when the packaging material is paper, and between the packaging material surface on which the printed film is provided and the printed film (=, it is not impregnated with ink, it is heat resistant) The present invention has been completed based on the fact that a layer with a flat surface is interposed and the printed film is formed to have a uniform thickness (secondly, it has been discovered that spark ignition can be prevented, and this knowledge). be.

That is, the microwave cooking container of the present invention is a food container used for microwave cooking of food, which is heat-resistant and does not allow ink to impregnate a partial area of the container wall surface of the container body or a partial area of the lid. A microorganism characterized in that a printed film with a uniform thickness is formed by printing using an ink composition containing reduced potassium titanate and conductive material particles via a flat surface layer made of resin or inorganic material. Container for cooking with waves.''

Invention 1: As a container body or a lid body,
Paper or a composite material of paper, aluminum, plastic film, etc. can be used.

Next, as an ink composition containing a reduced potassium titanate and conductive material particles, a reduced potassium titanate (K, 0.
nT102-x) and conductive material particles of polyethylene,
An ink composition blended with a resin or polyester such as polyurethane, nylon, polyimide, polybenzimidazole, or polyamideimide can be applied.

The reduced potassium titanate preferably has an average fiber length of 5 to 50 μm and a fiber diameter of 0.0 to 0 μm.

As the second conductive material particles, particles of conductive carbon, aluminum, nickel, iron, tin, zinc, etc. are effective.

A relatively heat-stable plastic layer such as polyester, polyethylene, nylon, cellophane, polysulfone, etc. may be provided as a protective layer on the printed film.

Next: - The flat surface layer made of resin or inorganic material must maintain a flat surface even when subjected to heat during microwave heating and must prevent ink from impregnating. As the material for this layer, a coating layer of thermosetting resin or ceramic filler is particularly desirable.

[For production]

When microwaves are irradiated onto the printed film, which is a heating element, the reduced potassium titanate has both a heat-generating effect due to microwave absorption and resistance loss; Conductive material particles (= irradiation current) produce a heat-generating effect that heats the food and browns it appropriately.Also, the conductive material particles generate heat from metal particles that reflect microwaves. When (= is,
It also has the ability to reflect microwaves and heat food.

Next: The two-surface flat layer maintains a flat state even when subjected to heat during microwave heating (enabling the formation of a uniform film thickness, thereby preventing the generation of sparks). be.

〔Example〕

Example / Ink composition containing polyester/L//-μ super potassium initetanate reduced product (KtO・nT i 02- x )/3 weight 5 and conductive carbon/S weight % and using polyurethane as a binder A uniformly thick printed film (coating amount: 109/ze) containing reduced potassium titanate and conductive carbon was formed using a gravure printing method, and then Polyethylene-〇〇μ and thin paper (SO&Ar?) were sequentially laminated on the top.

Next, the thin paper side of the obtained laminate was laminated with heat-resistant paper (YU) having a basis weight of 09β.

Example - Ink composition containing polyester/L//2μ (=potassium titanate reductant (KtO・nTlol-x)/j% by weight and conductive carbon 1% by weight, and having polyurethane as a binder) Using the gravure printing method (from the second step, a printed film of uniform thickness containing potassium titanate reduced substance and conductive carbon (coating amount: ``, !i'
/m2) was formed, and polyester 2Qμ and thin paper (&OEl/ze) were sequentially laminated on the side on which the printed film was provided.

Next, the thin paper side of the obtained laminate was laminated to heat-resistant paper having a basis weight of 0%.

Example 3 On polyester/2μ (=potassium titanate reduced body (
K10-nT10g-X)/! Using an ink composition containing r weight it% and conductive carbon 73 weight A printed film (coating amount: l' 9 m) was formed, and further, polypropylene-〇μ and thin paper (l' 9 m) were sequentially laminated on the side on which the printed film was provided.

Next, the thin paper side of the obtained laminate was laminated to heat-resistant paper having a basis weight of 01°.

Comparative example / On polyester saw μ; ; Potassium titanate reduced product (
KIO・nTlol-X) / ! Using an ink composition containing % by weight and conductive carbon/3 weight % and using polyurethane as a binder, a uniform film thickness containing reduced potassium titanate and conductive carbon was obtained using gravure printing method 1. A printed film (coating amount: /'97m) was formed, and then
OE/ze) were laminated.

Next, the thin paper side of the obtained laminate was measured to have a basis weight: t l, Og
, pasted onto heat-resistant paper.

The heat-resistant paper having the printed coating of Example/-j and Comparative Example 1 was placed in a household microwave oven jθθW, and 3 occ of salad oil at 3°C was placed on the polyester film.
AsE
' Measured using a back wall optical fiber thermometer manufactured by Company A (Squaden). In addition, when the glass petri dish containing the salad oil was removed and the heat-resistant paper with the printed coating was irradiated with microwaves, the presence or absence of sparks was visually observed (
I observed it from the second point.

Table: From the results of the temperature rise of salad oil during microwave irradiation, there is no ink impregnation and no flat surface layer between the heat-resistant paper and the printing film as a heating element.
In contrast to the second case where sparks occur in the comparative example, it was found that no sparks were generated when a flat surface layer such as polyethylene, polyester, or polypropylene was interposed between the heat-resistant paper and the printed coating.

Example FIG. 1 shows a pizza carton.

Paper too ll/? The bottom area (2) of the carton (1) is made of a composite material of
) (=potassium titanate reduced whisker (1 in the molecular formula)
0.nTtot-:c) / 3% by weight and conductive carbon/S by weight, and by a gravure printing method using an ink composition containing polyurethane as a binder, containing potassium titanate reduced body and conductive carbon. A printed film (coating amount: 109β) (3) with a uniform thickness was formed by printing.

Microwave irradiation was performed for 3θ seconds in a k00W microwave oven.

The exothermic temperature was 250°C.

Then, put the pizza ingredients in the carton box and
When I heated it for 0 seconds, I was able to brown it (moderately) and cook it.

Examples to Example 6 A base (5) in which a printed film containing reduced potassium titanate is provided on a paper base via polyester is placed, and inside the bag:
I was able to make bob corn by adding bob corn ingredients, closing the mouth, and heating it in the microwave.

Example t Printed coatings (3) containing reduced potassium titanate were provided on one side of a polyester film (6) at regular intervals as shown in the third figure.

Like this; polyester film formed by nibbling (6)
When I wrapped a rice ball and heated it in the microwave, it turned out like this:
:A pattern around the edge (I was able to make a second burnt mark).

〔Effect of the invention〕

As detailed above, according to the microwave cooking container (2) of the present invention, the potassium titanate reductant in the printed coating (=heat generation effect by absorbing microwaves) and the printing The coating has electrical conductivity (resistance loss due to two factors), and the heat generation effect due to two factors: the conductive material particles dispersed in the printed coating; (You can add dark eyes.

In addition, this invention has the advantage that the heating element can be formed in any pattern by printing (2).For this reason, (1) heating the item you want to heat (heating the item separately), (1) wire mesh It is possible to add a branding iron, etc., or (Il+) to synergistically create a temperature difference by combining with conventional differential heating.

Moreover, since the heating element can be printed on the device according to the present invention,
This involves controlling the printing density of the heating element (and thus obtaining the desired heating temperature).

Therefore, by selecting the print density, it is possible to form a heating element that generates heat to the extent that it moderately burns without being rapidly heated.

Furthermore, the container of the present invention has the advantage that it can be mass-produced at a lower cost than by vacuum deposition (by printing).

[Brief explanation of the drawing]

1 to 3 are developed views of cartons of Examples 1 to 60, FIG. 9 is a perspective view of Example 7, and FIG. S is a sectional view of Example S. Patent applicant Dai Nippon Printing Co., Ltd. Agent Patent attorney Atsumi Konishi Figure 1 Figure 2 Figure 3

Claims (4)

[Claims] (1) In a food container used for microwave cooking of food, a flat surface layer made of a resin or inorganic material that is not impregnated with ink is applied to a part of the container wall surface of the container body or a part of the lid. A container for microwave cooking, characterized in that a printed film having a uniform thickness is formed by printing using an ink composition containing an acid potassium reductant and conductive material particles. (2) The microwave cooking container according to claim 1, wherein the conductive material particles are metal particles that reflect microwaves. (3) The microwave cooking container according to claim 1, wherein the layer with a flat surface is made of a thermosetting resin. (4) The microwave cooking container according to claim 1, wherein the layer with a flat surface is made of a ceramic material.