JP2012245346A - Cooking container for microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooking container having excellent appearance, excellent heat resistance, and excellent placing/removing operability of a container lid.SOLUTION: This resinous cooking container includes a container body 50 and the container lid 60. The container lid 60 uses a resin material having excellent adherability of a paint, or the container lid 60 selects a resin having excellent adherability of a urethane resin paint. In the depth of the container lid 60, the depth of a lid side face 6S is larger than a bulging part 6M formed in the container lid 60, and the upper face side of a recessed part 6N is formed with a straight line-shaped lid handle 6T. A steam pressure inside the container is adjusted by vent holes 10, 10.

Description

  The present invention optimizes the vapor pressure generated by the steam generated from the cooked food and the convection of the generated steam during cooking, thereby steaming the cooked food evenly in a short time, and can be realized with conventional resin containers. The present invention relates to a resin cooking container for a microwave oven that has a high-class feeling that has not been obtained.

  A cooking container is used in the case where heat is passed through the food using steam or reheating is performed while preventing drying of the cold food. Steaming is a typical steaming container that has been used for cooking since ancient times. This steamed rice uses a bamboo shoot and bamboo net to communicate steam on the bottom of a wooden frame bent into an annular shape, and is usually used in combination with a disk-shaped wooden lid. Such steaming containers are hardly seen to be used outside the so-called professional field.

  With the spread of microwave ovens, in general households, instead of steaming, resin cooking containers called steamers have become widely used, and for microwave ovens that have been devised from various industries related to resin products. Cooking containers have been proposed (see prior art documents 1, 2, 3 and 4 below).

Looking at the basic concept of conventional cooking containers from the prior art literature, as a measure to ensure safety when adopting an airtight maintenance structure, which maintains the airtightness so as not to miss steam, which is the most necessary element for cooking It can be said that there are three points: the adoption of a decompression mechanism and the proposal of a resin that takes into account the heat resistance of a resin cooking vessel. If steam generated by heating in a microwave oven is inadvertently leaked, steaming cooking cannot be finished as expected, and if the generated steam pressure exceeds a certain limit, the risk of lid jumping etc. can be avoided. When the food is boiled, the cooking container is also heated to a high temperature of 100 degrees or more, and the heat resistance of the resin is also important.

That is, in the cooking container, although the high demand in the pressure container is not required, the steam is not escaped and the steam pressure is not excessively increased, and the container can be safely taken out even when the food is boiling. It is fundamental to maintain hardness.

In order to structurally realize the above basic requirements, a highly airtight fitting structure is usually employed between a container body and a lid in a conventional cooking container (see Patent Documents 1 to 3 below). 4).

In a synthetic resin cooking container, polypropylene (hereinafter simply referred to as “PP resin”) and saturated polyester resin (hereinafter simply referred to as “PET resin”) are mainly used. As representative examples, a container for cooking (see Patent Document 3 below) formed by blending a polyetherimide resin (PEI) and a polycarbonate resin (PC), polybutylene terephthalate (hereinafter simply “ A cooking container (referred to as Patent Document 5 below) molded with a “PBT resin”), these proposals are proposals with improved heat resistance.

A container main body and a cover body formed of a general PP resin are attached to the container main body with high airtightness (see Patent Documents 1 to 4 below). A decompression mechanism (see Patent Documents 1, 2 and 4 below) that prevents the vapor pressure from increasing during cooking and preventing the lid from being blown has been proposed.

PP resin is also a crystalline resin, it is well known that moldability is good, and the molded product is also excellent in heat resistance, and it is widely used as a cooking container based on its heat resistance and moldability. . And since this resin has strong molecular orientation compared with other crystalline resins, it is applied as a flap part (refer to Patent Document 1 below) utilizing the fact that repeated bending strength (bending fatigue property) is large. Is formed. In addition, a microwave cooking container (see Patent Document 2 below) in which a bottom container and an upper lid are fitted to each other has been proposed by utilizing this characteristic of molecular orientation.

In the case of PP resin, the influence of the orientation is greatly concerned, and if the part of a knob (see Patent Document 6 below) in a container lid, which is now common, is integrally formed with the lid, the partial thickness of the knob Since the solidification time is partially delayed from other parts because of the difference in thickness, sinking occurs due to this, and warpage or deformation that seems to be affected by the sinking and orientation, or deformation is Appears throughout the product. This will reduce the value of the product.

In the example proposed and implemented in Patent Document 6 below, an aluminum pan main body and an inner lid are attached by fitting. That is, when this is attached and cooking is performed in a microwave oven, the contents are heated to high temperature at an early stage.

Also, when a hole is made in the lid to form a pressure reducing mechanism (see Patent Document 4 below), the hole is on the upper side of the container, so that steam generated inside the cooking container circulates inside the container. However, the hole, which is the decompression mechanism, is released in a cylinder-removed state. Therefore, there is a possibility that uneven cooking may occur in the cooked food. On the other hand, in the resin industry, it is well known that when a hole is simultaneously formed in a product, a weld mark is generated and the strength is lowered.

Furthermore, another problem with the conventional cooking container is that it is accompanied by a sense of resistance in providing the cooking container after heating to the table as it is. Although the design problem can be changed as appropriate, the texture specific to the resin-made cooking container appears to be poor when arranged in line with other general tableware. This is a problem caused by the resin material used in conventional cooking containers.

In a cooking container, since the container body and the lid body are required to have heat resistance for microwave ovens, in addition to PP resin for conventional cooking containers, resin materials as shown in Patent Document 3 and Patent Document 5 are also available. Proposed. However, since these resins are hard, it is unavoidable that they are difficult to adhere so that vapor does not leak. In general, it is said that the dough surface of a heat-resistant molded product has hardness and poor paint adhesion.

In the present invention, for the problem of poor appearance of cooking containers, as seen in most lacquerware products today, paint finish on the resin fabric (see Patent Document 7 below), equivalent to lacquerware products It is intended to improve the appearance.

JP 2010-132356 A JP 2007-301000 A Japanese Patent Laid-Open No. 6-304063 Japanese Utility Model Publication No. 62-96343 JP-A-3-222914 Japanese Utility Model Publication No. 52-90269 Japanese Patent No. 3119654

  As a result of examining the problems of the conventional cooking container, it can be considered as follows.

  The cooking container is composed of a container body and a lid, and it is the lid that is the upper surface of the cooking container that feels visually beautiful. The decoration of the outer surface of this lid, that is, the adhesion of the paint is good By selecting an appropriate resin material, the lid body can be painted and the appearance can be improved.

  Based on the above examination, the present invention has the following three problems to be solved. First of all, the lid has no pressure reducing mechanism, and the lid is provided with a handle of a sufficient size at a position where it can be easily operated. Allow the lid to be removed. For this reason, the depressurization mechanism is devised so that it functions in the same manner as the depressurization mechanism at a place other than the top surface of the lid or at a portion other than the lid.

  That is, the decompression mechanism in the lid is abolished, and the phenomenon of steam removal from the cylinder is suppressed to prevent uneven heating of the food and improve the thermal efficiency of the cooking container. In addition, as a defect of providing a hole in the lid for providing the pressure reducing function, a weld mark is generated in the resin molded product, and the strength is reduced.

  A hard resin material with good paint adhesion is used for the lid of the cooking container, and the lid that is easy to visually recognize is painted to improve the appearance.

  In order to achieve the above object, the present invention adopts the following configuration.

(Solution 1)
The microwave oven cooking container of the present invention is a container body formed by integrally molding a resin material with a bottom surface, a container side surface rising from the bottom surface, and a pair of container handles formed on the upper end portion of the container side surface, and downward toward the center. In a cooking container for a microwave oven comprising a lid having a lid handle formed on the upper recessed portion of the bulging portion and a lid of a lid integrally formed from a synthetic resin material with a lid side surface falling from the peripheral edge of the lid surface In addition to forming the lid side surface deeper than the downward bulging portion, the container body and the container lid are formed at the lower end of the lid side surface by forming a belt-like positioning step with discontinuous portions set in at least two locations on the container side surface. Are combined in such a manner that they face the positioning stage vertically and fall into the inside of the container body, and a vent is formed in the discontinuous part between the combined container body and the container lid, and heating In the process, the downward bulging part changes the direction so as to distribute the rising steam in the container to the peripheral part of the container, and the vent vents the excess steam in the container to the outside to prevent the container lid from rising. It is said.

  The solving means 1 will be described. The present invention is premised on a microwave oven cooking container comprising a container body integrally formed from a resin material and a container lid. The container main body includes a bottom surface and a container side surface, and includes a lid surface and a lid side surface. A bulging portion is provided at the center of the lid surface, and a lid handle is provided on the top surface of the bulging portion. That is, the container lid is grasped with a finger on the lid handle, and the attachment / detachment operation is fitted so as to drop the container lid onto the container body, and since it is so-called rattling, it can be easily closed with one hand. This attachment / detachment operation is a very common operation for a container with a lid.

On the inner side of the container side, a belt-like positioning step with discontinuous portions is formed at least at two locations, and the container lid is placed on the container main body so that the lower end of the side of the lid faces the positioning step. Can be combined in a manner of dropping inside. In the combination mode in which the container lid is located inside the container body, the water vapor that diverges from the heated food and adheres to the back of the container lid eventually drops into the container and becomes steam again. Can be cooked without drying the food. And since the water droplets that flow down the lid side surface and reach the lower end of the lid side surface function as a liquid sealant that enhances the adhesion between the container body and the container lid, excessive adhesion between the container body and the container lid Can be made unnecessary.

  The water that circulates while changing the form in the cooking vessel steams the food in such a way that it repeatedly rises and falls, but in the center of the lid surface, the downward bulge rises due to boiling. Is smoothly changed in the outer peripheral direction by the bulging portion and controlled to descend along the side surface of the container. Therefore, uneven heating of the cooked food due to the heat bias in the container is prevented, and the thermal efficiency of the cooking container is improved.

  Regarding the adjustment of the steam pressure required for the cooking container, the downward bulging part is redirected to distribute the rising steam to the peripheral part of the container, and the vent vents exhaust excess steam in the container and functions as a pressure adjustment mechanism Can respond. In other words, the positioning step where the container lid is to be placed is not continuous over the entire circumference of the container side, but the vent is formed in a state where it is divided at least at two discontinuous portions. In this portion, the adhesion between the container body and the container lid is intentionally lost. The steam in the cooking container is guided to the small groove because there is a V-shaped small groove formed by the discontinuous part, the inner side surface on the upper end side of the container, and the side surface of the container lid, and the turntable in the microwave oven. The air in the microwave oven is discharged at the same time as inducing steam at the vent, and simultaneously sucked in, so that it is possible to avoid the danger that the vapor pressure increases cumulatively and the container lid jumps up.

(Solution 2)
Furthermore, the pair of container handles are characterized in that they are formed at intermediate positions of the vent holes formed corresponding to at least two discontinuous portions.

The positional relationship between the container handle and the discontinuous portion of the positioning stage is a positional relationship in which the container handle is formed at an intermediate position between at least two discontinuous portions. As a result, the container handle is positioned at a position farthest from the vent hole from which steam may be ejected, and the cooking container can be handled safely.

(Solution 3)
The microwave oven cooking container according to the present invention is based on the cooking container described in Solution 1, and the container lid is a mixed resin material of PET resin and ABS resin, or a mixed resin material of PET resin and PBT resin. The resin composition is characterized in that a urethane resin paint is applied and baked onto a dough formed using one of the mixed resin materials as a main material and an appropriate crystallization promoting material as an additive.

  The solving means 3 will be described. In the solution means 1 and 2, a configuration is shown in which the container lid is dropped and fitted into the container main body, which is combined by so-called play, and the appearance of the cooking container can be improved by the container lid. That is, ribs may be partially reinforced in order to provide the necessary functions to the container lid, which may cause partial sink marks, and the appearance of the cooking container will be greatly impaired if deformation occurs as a whole. End up. However, the mixed resin material shown in the above configuration is a mixed resin material containing a PET resin, and has a reputation for moldability and dimensional stability even in the lacquerware industry. In particular, the adhesion of urethane resin paint, which is frequently used in place of lacquer in the lacquerware industry, is also good, and the coating can be performed simultaneously with the crystallization of the fabric, and also has excellent heat resistance. For details, refer to Patent Document 7 presented in the Prior Art column.

(Solution 4)
The cooking container for a microwave oven according to the present invention is characterized in that the cooking container described in the solution 3 is a basic invention, and the resin material of the container body is PP resin.

The above solution will be described. The solution means is formed in a mixed resin material containing PET resin as shown in the solution means, and by using PP resin for a container lid having a stable molding size, a shape stable shape is obtained. The container body can be molded, and a container lid having a stable dimension can be assembled with the container body, and can be smoothly attached and detached.

The microwave oven cooking container of the present invention has a container handle at a safe position of the container body, and a container lid that is engaged with the container body has a dedicated handle. Can be operated. Adjustment of the internal pressure required as a cooking container without the decompression mechanism is performed by intentionally discontinuously positioning a part of the positioning stage where the container body and the container lid are in close contact with each other. A vent is formed by the side of the lid, and a small groove is formed by the side of the container lid and the inner side of the upper end of the container body. The small groove and the vent communicate with each other. Accordingly, the air in the microwave oven is guided to flow through this small groove, and on the other hand, the downward bulging part on the lid surface redirects the steam in the container to the peripheral part of the container. The vent can be pulled out so as to be guided by the rotation of the turntable and sent out above the vent.

In addition, since there is no decompression mechanism in the container lid, the steam rising from the cooked product does not escape through the cylinder as it is, and the direction of the container is controlled smoothly by the bulging part that hangs down from the container lid. Circulates the entire interior. Therefore, uneven heating with respect to the food is prevented, and the thermal efficiency of the container is also improved.

Furthermore, a bulging portion that hangs down in a concave shape is provided on the upper surface side of the container lid, and a handle is provided on the concave portion side. Since the lid part is provided with a lid handle, it is set to a size that allows the insertion of a finger that grips the handle with a width and thickness, and the bulging part protrudes greatly inside the container lid based on the size. Become. Since the height of the lid side surface (depth of the lid) can be increased depending on the size of the bulging portion, the direction change and circulation of the steam become smooth, so that the thermal efficiency is improved.

Using a mixed resin material containing PET resin as the resin material for the container lid and the container lid having a urethane coating finish can substantially exhibit the same appearance improvement effect as that of today's resin lacquerware products. . And since a shaping | molding dimension is favorable and the shape is stable, the quality improvement as a container lid can be aimed at.

And since PP resin is molded as a resin material for the container body, which has little change in plate thickness, it has good moldability as before, and the container lid can be assembled stably by combining with the container lid. A stable cooking container can be realized.

The top view which shows embodiment of the cooking container of this invention. XX sectional view taken on the line in FIG. FIG. 2 is a cross-sectional view taken along line YY in FIG. 1. The ZZ line cutting | disconnection of FIG. 1, A arrow side view.

  Hereinafter, embodiments of the cooking container for a microwave oven according to the present invention will be described with reference to the drawings.

  Each of the cooking containers has a simple configuration including a resin container main body 50 and a container lid 60. As the planar shapes of the container body 50 and the container lid 60, an elliptical shape is employed, and therefore the entire cooking container has an elliptical planar shape (FIG. 1).

  The container body 50 in the present embodiment is made of PP resin. The container body 50 is formed by integrally forming a bottom surface 5B, a container side surface 5S rising from the bottom surface 5B, and container handles 5T and 5T at the upper end edge of the container side surface 5S. A flange 5F protruding sideways is formed over the entire circumference. The container handles 5T and 5T are formed by partially expanding the width of the flange 5F, and the container handle 5T and the flange 5F are configured to smoothly continue without a step. Such container handles 5T and 5T are provided at two locations in the major axis direction of the ellipse, and can stably support the container body 50 (FIGS. 1 to 4). In general, when the container body 50 is colored, it is molded by mixing a pigment into a resin material.

  The container lid 60 is formed by integrally molding a lid surface 6P, a lid side surface 6S falling from the lid surface 6P, and a lid handle 6T. A convection-promoting bulging portion 6M that hangs down in a hemispherical shape is formed at the center of the lid surface 6P, and the length (depth) of the lid side surface 6S is deeper than the depth of the depression of the bulging portion 6M. ing. The lid surface 6P has a shape that is greatly recessed at the bulging portion 6M. The lid handle 6T is shaped like a thick rib with respect to the recess 6N. In addition, a large number of water droplet-shaped small protrusions 6D are dispersedly arranged on the back surface side of the lid surface 6P, and vapor condensed on the lid surface 6P can be dispersed and dropped.

  The container lid 60 is baked with a urethane resin paint. In order to enhance the adhesion of the paint, the resin material of the container lid 60 is a mixed resin material of PET resin and ABS resin as a main material, and an appropriate amount of crystallization promoting material is included as an additive. As a blending ratio of these materials, it is preferable to use 40 parts by weight of PET resin, 40 parts by weight of ABS resin, and the remaining amount as an additive. At this time, any additive can be selected from known crystallization promoting materials. By mixing the ABS resin with this PET resin, the heat resistance is improved up to the crystallization temperature of the PET resin, and further, the adhesion of the ABS resin to the paint is exhibited.

  Even if the ABS resin in the main material is replaced with a PBT resin, the surface of the fabric after molding is soft, the adhesion of the paint is good due to the softness, the paintability is good, and the painted paint is used. Since the surface is baked, the surface can have hardness (see Patent Document 7).

  A positioning step 5E for positioning the container 60 is formed at the boundary between the container side surface 5S and the flange 5F in the container body 50. The container body 50 and the container lid 60 are positioned at the lower end surface of the lid side surface 6S. It is assembled in a state of being supported from below by the step 5E. That is, as a whole, the container lid 60 molded in a stable molding dimension is loosened by a certain depth to the container body 50 molded in a stable shape, and dropped into the container body 50.

  The positioning step 5E is formed in a band shape along the inside of the flange 5F, but the positioning step 5E has discontinuous portions 5G and 5G at two positions corresponding to the short axis position of the ellipse (FIG. 1, FIG. 1). Figure 2). The shape of each discontinuous portion 5G is a complicated curved surface shape that can be said to be a part of the positioning step 5E deformed downward and laterally, but the function of each discontinuous portion 5G is the same as that of the container body 50. This is a function of preventing the container lid 60 from contacting in a very partial range. Therefore, as long as this function is realized, the shape of the discontinuous portions 5G and 5G can adopt a shape other than that illustrated.

  That is, the container lid 60 is fitted into the container main body 50, and the lower end edge of the lid side surface 6S is in close contact with the positioning step 5E to form the vents 10 and 10 with the discontinuous portion 5G and the lid side surface 6S. Substantially V-shaped small grooves 11 and 11 are formed by the upper end of the container body 50 and the lid side surface 6S. Therefore, when the turntable of the microwave oven rotates, the air in the small grooves 11, 11 flows by the rotation and is guided to flow to the vent 10 communicating with the small grooves 11, and the vapor in the container hangs down. The steam is stably guided from the vents 10 and 10 to the small grooves 11 and 11 or from the vent 10 to the upper side so that the direction of the bulging portion 6M changes the direction around the container and the steam is drawn out. The

Therefore, the cooking container comprising the combination of the container main body 50 and the container lid 60 in the above-described manner is safe and safe in cooking with a microwave oven for food containing moderate moisture and in reheating cooked food. It can be used with high thermal efficiency.

  In addition, you may place a cooking container on the turntable of a microwave oven as it is. This is because the container lid 60 fits inside the container body 50, and as long as the moisture content of the food is appropriate, there is very little risk of spilling. When the amount of moisture in the cooked product is large, it may be placed on a suitable tray and stored in the microwave oven.

  During cooking, the steam rising from the cooked food (indicated by an arrow H in FIGS. 1 to 4) is controlled in direction so as to smoothly go in both directions by the bulging portion 6M that hangs down from the central position of the container lid 60, and thereafter It can circulate so that it may cool and descend from the circumference side of a cooking vessel. Therefore, heat circulation is good and heat unevenness due to uneven convection of steam in the cooking vessel is unlikely to occur.

Moreover, since the bulging portion 6M is provided with a thick lid handle 6T, it must be large enough to allow fingers to be inserted. Therefore, it must be in a form that protrudes greatly into the container lid 6. And the height (depth) of the lid side surface 6S is also increased. That is, a sufficient space is obtained between the upper surface of the cooked food in the cooking container and the inner surface of the container lid, and the steam circulation is made smoother.

When the amount of steam generated in the cooking container increases and the steam pressure in the cooking container exceeds a certain limit, excessive steam escapes from the two discontinuous portions 5G and 5G of the positioning stage 5E ( Figure 2). In this case, the two discontinuous portions 5G and 5G function to keep the pressure in the cooking container within a certain range as steam removal and to prevent lid splashing and the like in advance. The opening areas of the discontinuous portions 5G and 5G responsible for the important functions of the vents 10 and 10 are experimentally determined in consideration of the internal volume of the cooking container and the weight of the container lid, and are optimized. ing.

The increase in the opening area can be achieved even if the cutout is formed so as to partially cut out the lower end of the lid side surface 6S of the container lid 60 facing the discontinuous portions 5G, 5G. Further, the container body 50 is not provided with the discontinuous portions 5G and 5G, but is formed as a continuous positioning step 5E, and the lower end surface of the lid side surface 6S of the container lid 60 is provided with a partial notch that does not adhere to the positioning step 5E. Vapor can also be removed (“notch” is not shown).

Regarding the danger of vapor discharge from the vents 10 and 10, the lid handle 6T is located in the middle of the two discontinuous portions 5G and 5G, and the container handles 5T and 5T have an elliptical shape. With respect to the discontinuous portions 5G and 5G arranged corresponding to the radial positions, the container main body 50 is operated even when the container lid 60 is operated by being arranged corresponding to the elliptical long diameter position. The arrangement relationship that can avoid steam very naturally is established.

50 Container body 5B Bottom surface 5E Positioning stage 5G Discontinuous portion 5S Container side surface 5T Container handle 60 Container lid 6P Lid surface 6M Swelling portion 6N Recessed portion 6S Lid side surface 6T Lid handle 10 Vent

JP 2010-132356 A JP 2007-301000 A Japanese Patent Laid-Open No. 6-304063 Japanese Utility Model Publication No. 62-96343 JP-A-3-222914 Japanese Utility Model Publication No. 52-90269 Japanese Patent No. 3119654

Claims (4)

A container body formed by integrally molding a bottom surface, a container side surface rising from the bottom surface, and a pair of container handles formed at the upper end of the container side surface from a synthetic resin material, and a downward bulge that hangs down in a hemispherical shape at the center In a cooking container for a microwave oven comprising a lid surface in which a lid handle is formed in the upper concave portion of the portion, and a lid of a container formed integrally from a synthetic resin material with a lid side surface falling from the peripheral edge of the lid surface,
The lid side surface is formed deeper than the downward bulging portion, and the lid side surface is formed with a belt-like positioning step having discontinuous portions at least at two locations, whereby the container body and the container lid are The lower end of the lid side face is combined with the positioning step so as to face up and down and fall into the inside of the container main body, and a vent is formed in the discontinuous portion between the combined container main body and the container lid. So that
During cooking, the downward bulging part changes direction so that the rising steam in the container is directed to the peripheral part of the container, and the vent vents the excess steam in the container to the outside to lift the container lid. A cooking container for a microwave oven characterized by blocking. The pair of container handles is formed at an intermediate position of the vent formed corresponding to the at least two discontinuous portions,
The cooking container for microwave ovens according to claim 1. The container lid is mainly composed of a mixed resin material of PET resin and ABS resin or a mixed resin material of PET resin and PBT resin, and an appropriate amount of crystallization promoting material is added. The microwave oven cooking container according to claim 1, wherein a urethane resin paint is baked and applied to a lid cloth formed as an agent. The cooking container for a microwave oven according to claim 1 or 2, wherein the resin material of the container body is PP resin.

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