JP3122769U - Resin tableware for electromagnetic induction heating - Google Patents

Abstract

Even if a resin tableware is provided with an electromagnetic induction heating plate, the electromagnetic induction heating plate does not appear on the inner and outer surfaces of the tableware main body, and is hardly affected by the difference in thermal expansion between the electromagnetic induction heating plate and the tableware main body. Without providing resin tableware that can be used as a tableware that can be kept warm for a long time.
An electromagnetic induction heating plate 13 is embedded in a bottom portion of a tableware body 10 made of a thermosetting resin in parallel with the bottom surface. The tableware main body 10 is formed by integrally forming an outer core 11 and an inner core 12 made of unsaturated polyester resin (BMC) for tableware by compression molding. An electromagnetic induction heating plate 13 is embedded in the bottom boundary between the outer core 11 and the inner core 12.
[Selection] Figure 2

Description

  The present invention relates to a resin tableware for electromagnetic induction heating having an electromagnetic induction heating plate integrally at the bottom.

  It is already known to keep dishes cooked on dishes such as dishes by electromagnetic induction heating. However, since the tableware used is a non-magnetic metal material such as aluminum or copper with good thermal conductivity, even if the heat-retaining temperature is set lower than the boiling temperature, it can reach the edge of the tableware in a short time. In many cases, it becomes hot when heated, and it cannot be carried or served by hand.

In electromagnetic induction heating, it is necessary to provide an electromagnetic induction heating element at the bottom of a cooking container or tableware. As a normal means for attaching the heating element, a magnetic metal material serving as a heating element is welded to an outer bottom surface or an inner bottom surface of a container body or tableware body made of a nonmagnetic metal material. It is also known that the bottom of the container is doubled so that the heating element is accommodated and fixed in the bottom, or a liquid heating element is filled, and the dish-like bottom part in which the heating element is embedded and the container body are connected. It is also known that it is formed separately and its dish-shaped bottom is joined to the lower part of the container body in a watertight manner. It is also known that a cooking container or tableware is formed of a nonmagnetic material such as glass, wood or plastic, and a lattice-shaped heating element is formed.
Japanese Patent Laid-Open No. 11-185946 JP 2000-31774 A

  In resin tableware made of thermosetting resin, the thermal conductivity of the resin is remarkably lower than that of metal, so that it is difficult to heat up to the edge due to heating at the bottom of the tableware. Therefore, if the tableware is made of resin, even if the dish placed on the tableware is kept warm by electromagnetic induction heating, it does not heat up to the edge of the tableware, so it can be carried by hand. However, from the standpoint of tableware use and appearance, it is not preferable to attach an electromagnetic induction heating element made of a different material to the inner bottom surface or outer bottom surface of the tableware main body, and the electromagnetic induction heating element peels off from the bottom of the tableware due to the difference in thermal expansion. It also has a problem that it cannot withstand long-term use.

  In addition, it is difficult to accommodate and fix the heating element in the bottom part by forming the bottom part in a double structure, or to fill the heating element in a liquid state, and the dish-like bottom part in which the heating elements are embedded at equal intervals is arranged at the lower part of the container body. Since it is technically difficult to join watertightly, a tableware for electromagnetic induction heating using a resin has not been put into practical use.

  This device was conceived from the above circumstances. The purpose of this device is to prevent the electromagnetic induction heating plate from appearing on the inner and outer surfaces of the tableware body even if it is a resin tableware provided with the electromagnetic induction heating plate. It is an object of the present invention to provide a new resin tableware for electromagnetic induction heating that can be used as a tableware that can be kept warm for a long period of time without being substantially affected by the difference in thermal expansion between the induction heating plate and the tableware body.

  This device according to the above-mentioned object is that an electromagnetic induction heating plate is embedded in the bottom of a tableware body made of a thermosetting resin in parallel with the bottom surface, and the tableware body is made of unsaturated polyester resin (BMC) for tableware. The outer core and the inner core are integrally formed by stacking by compression molding, and the electromagnetic induction heating plate is embedded in the bottom boundary between the outer core and the inner core.

  The electromagnetic induction heating plate is made of an iron or stainless steel punch metal plate or a lattice plate having a large number of small holes on the plate surface, and the resin of the outer core and the inner core is integrated by the small holes so that the bottom of the tableware body Is formed.

  The tableware body has a thread bottom on the outer bottom surface, and the distance from the top plate of the electromagnetic induction heating plate is set to 9.0 mm or less based on the height of the thread bottom and the thickness of the outer sheath. The total thickness of the bottom of the tableware body is in the range of 2.5 to 5.0 mm, and the bottom thickness of the inner core is formed thinner than the bottom thickness of the outer core. The tableware main body is in the form of a plate, a bowl, and a bowl.

  In the resin tableware with the above configuration, the electromagnetic induction heating plate is embedded in the bottom of the tableware body and integrated with the body, so the electromagnetic induction heating plate can be securely attached even if the tableware body is a thermosetting resin. Even if there is a difference in thermal expansion, the electromagnetic induction heating plate does not come off. Further, since the electromagnetic induction heating plate cannot be seen from the outside, the appearance of the tableware body is not impaired, and it can be washed in the same manner as normal tableware.

  In addition, since heating is performed from the bottom of the tableware by induction heating of the electromagnetic induction heating plate, the heating efficiency at the bottom is high, and the heat of the cooked food is kept warm even if the thermal conductivity of the thermosetting resin is lower than that of metal, glass, etc. It can be used satisfactorily for use. In addition, it takes time for the peripheral part to become hot because of its low thermal conductivity, so the temperature during the heat retention time until serving is such that you do not feel the heat even if you hold it by hand. It can be carried and served directly with an edge.

  1 and 2 show resin tableware for electromagnetic induction heating according to the present invention. 10 is a tableware body made of unsaturated polyester resin for tableware (BMC) manufactured by Matsushita Electric Works Co., Ltd., 11 is the outside of the tableware body. A child 12 is an inner core of the tableware body, and 13 is an electromagnetic induction heating plate embedded in the bottom boundary of the stacked outer child 11 and inner core 12 in parallel with the bottom surface. In addition, although the form of the tableware main body 10 of illustration is a deep dish, forms, such as a bowl and a bowl, may be sufficient.

  The electromagnetic induction heating plate 13 is a plate body made of iron or stainless steel and having a thickness of about 0.5 mm, and has a large number of small holes 14 into which a resin can be press-fitted into a plate surface having a size covering the entire bottom surface of the tableware body 10. It consists of a drilled circular plate. The plate body may be a punch metal plate or a lattice plate, and the shape of the small holes 14 is not limited to the illustrated square, and may be a circular hole, a rhombus, or the like.

  The outer element 11 has a thread bottom 11a around the outer bottom surface, and the outer bottom surface is positioned away from the top plate 16 of the electromagnetic cooker 15 by the thread bottom 11a. Further, the distance of the electromagnetic induction heating plate 13 from the top plate 16 can be set within 0.5 to 9.0 mm depending on the thickness of the outer core 11 and the height of the thread tail 11a.

  This distance can be easily set by changing the thickness of the bottom portion of the outer element 11 and the height of the thread bottom 11a relatively. However, since stress due to thermal expansion of the electromagnetic induction heating plate 13 acts on the bottom of the outer element 11, cracks are likely to occur if the thickness of the bottom is too thin, and drop strength is also reduced. The distance from 16 is set by setting the height of the yarn bottom 11a low.

  The heating efficiency of the inner bottom surface of the tableware main body 10 by the electromagnetic induction heating plate 13 increases as the bottom thickness of the inner core 12 is reduced. However, since the bottom portion of the inner core 12 is also affected by the thermal expansion of the electromagnetic induction heating plate 13 in the same manner as the outer core 11, the thickness of the bottom portion is limited to a range in which no cracks occur. Moreover, the thickness of the whole bottom part as the tableware main body 10 is preferably in a range of 2.5 to 5.0 mm, the drop strength is lowered when the bottom part thickness is 2.5 mm or less, and the tableware becomes heavy when handled at 5.0 mm or more. It will be difficult.

  In the tableware body 10 having the above configuration, when an electric current is passed through the magnetic force generating coil in the electromagnetic cooker 15 on the hot plate 16 of the electromagnetic cooker 15, the electromagnetic induction heat generating plate 13 generates heat in the bottom portion by induction heating, and the bottom portion. Heat the whole. The thermal conductivity of the thermosetting resin forming the tableware main body 10 is lower than that of metal, glass, or earthenware, but it can be sufficiently used for keeping food cooked. The unsaturated polyester resin for tableware (BMC) can withstand temperatures from 120 ° to 130 ° C., so that the cooked food (for example, soup) in the tableware main body can be sufficiently kept at that temperature or lower. Moreover, since it takes time for the peripheral portion to become hot due to the heating by the electromagnetic induction heating plate 13 due to the low thermal conductivity, the temperature of the peripheral portion feels hot even if it is held by hand as long as it is within the heat retention time until the serving. Since there is no extent, it is possible to carry and serve the tableware body after the heat insulation by holding the peripheral portion directly.

  The deep dish body 10 can be manufactured by compression molding that is normally performed. FIG. 3 is an explanatory diagram of the manufacturing process.

  First, the outer mold forming cavity mold 20 heated to the molding temperature and the heated core mold 21 above the mold are closed, and a thermosetting material resin (not shown) placed in the cavity mold 20 is used. The outer core 11 which is heated and compressed by the core and is semi-cured is formed (see FIG. A).

  Next, although not shown, the core mold 21 is opened upward to release the outer element 11 from the core, and the outer element 11 is left in the cavity of the cavity mold 20. After the mold opening is completed, the cavity mold 20 is moved under the core mold 22 for forming the core.

  After the movement, the electromagnetic induction heat generating plate 13 having the small holes 14 formed in the entire plate surface is set on the upper surface of the semi-cured outer member 11, and the same material as the outer member 11 is placed at the upper center of the electromagnetic induction heat generating plate 13. Resin 12a is placed (see FIG. B).

  Thereafter, the core mold 22 and the cavity mold 20 heated to the molding temperature are closed, and the material resin 12a is heated and compressed by the core to mold the inner core 12 on the outer core 11 and the electromagnetic induction heating plate 13. The resin that forms the bottom of the inner core 12 covers the electromagnetic induction heating plate 13 and is press-fitted into the small hole 14 to be integrated with the resin of the outer core 11, and is pressed and integrated with the resin of the outer core 11 except for the bottom. . Thereby, it becomes the tableware main body 10 embedded in the bottom boundary of the outer core 11 and the inner core 12 on which the electromagnetic induction heating plates 13 are stacked in parallel with the bottom surface (see FIG. C).

It is a top view which shows the half part of the resin-made tableware for electromagnetic induction heating concerning this invention in a cross section. It is a longitudinal cross-sectional view of resin tableware. It is explanatory drawing which shows the manufacturing process of the resin tableware concerning this device in order.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tableware main body 11 Outer child 11a Itosiri 12 Inner child 13 Electromagnetic induction heating plate 14 Small hole 15 Electromagnetic cooker 16 Top plate

Claims (6)

  A resin tableware for electromagnetic induction heating, characterized in that an electromagnetic induction heating plate is embedded in the bottom of a tableware body made of thermosetting resin in parallel with the bottom surface.   The tableware body is formed by integrally forming an outer core and an inner core made of unsaturated polyester resin (BMC) for tableware by compression molding, and the electromagnetic induction heating plate is provided at the bottom boundary between the outer core and the inner core. The resin tableware for electromagnetic induction heating according to claim 1, wherein the tableware is embedded.   The electromagnetic induction heat generating plate is made of an iron or stainless steel punch metal plate or a lattice plate having a large number of small holes on the plate surface, and the outer and inner resin are integrated by the small holes to form the bottom of the tableware body. The resin tableware for electromagnetic induction heating according to claim 1 or 2, wherein the tableware is formed.   The tableware main body has a thread tail on the outer bottom surface, and the distance from the top plate of the electromagnetic induction heating plate is set to 9.0 mm or less from the height of the thread tail and the bottom wall thickness of the outer shell. The resin tableware for electromagnetic induction heating according to any one of claims 1 to 3.   The total thickness of the bottom of the tableware body is in the range of 2.5 to 5.0 mm, and the bottom thickness of the inner core is formed thinner than the bottom thickness of the outer core. 4. The resin tableware for electromagnetic induction heating according to any one of 4 above.   The resin tableware for electromagnetic induction heating according to any one of claims 1 to 5, wherein the tableware body is in the form of a plate, a bowl, and a bowl.

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