JPH01163009A - Microwave processing jig - Google Patents

Abstract

PURPOSE:To manufacture a jig fit for microwave processing and simplify mechanical processing by constituting the jig of metal beds provided on the opposite side of a pin clamped surface of a material to be heated and gypsum molds fixed to said metal beds and containing water glass of more than given thickness from the bed surface to the side of the material to be heated. CONSTITUTION:A jig is constituted of metal beds 10 and 11 provided on the opposite side of the clamped surface of a material to be heated and molds 13 and 14 fixed to said metal beds and of given thickness on the side of the material to be heated. Said molds 13 and 14 are constituted of gypsum to which water glass is added and has epsilongamma(relative dielectric constant) of 4-6 sufficient to pass microwaves, and are formed into given shapes by mechanical processing. Said molding jig clamps the material to be heated in its intermediate section and presses the same from both sides. Heating is not carried out within 1/4 wave length from a metal plate, while the wave length becomes 1/4 (epsilongamma)<1>/<2> in a dielectric material of relative dielectric constant epsilongamma. Therefore, in order to heat the whole of the material to be heated encircled with the molding jig, the molds 13 and 14 of said molding jig need at least the thickness of lambda/4(epsilongamma)<1>/<2> or more from the surfaces of metal beds 10 and 11 and the side of the material to be heated.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a microwave processing jig, and in particular, a method for processing by heating and melting using microwaves, which can be used to mold plastics, wood, food products, etc. Concerning molding jigs for objects that require molds.

[Conventional technology]

Generally, wood molding, adhesive processing, plastic molding, etc. were performed by applying heat while applying pressure with a mold. However, in recent years, with the development and advancement of microwave engineering, microwave heating and melting can be performed in a short time and is relatively easy to handle, so heating using microwaves has been considered. It is expected to improve heating efficiency. However, no jig has been developed for use in the microwave processing method. This microwave processing jig must be made of a material that allows microwaves to pass through, and plastic cannot be used because it is susceptible to high heat when heated by microwaves. Other materials such as glass, ceramics, and ceramics may be used, but since machining is difficult, molds (jigs) of any shape can be easily formed.
cannot be made accurately. For this reason, conventionally, when bonding or shaping wood, a wooden mold 1 is used as shown in FIG. 1, and a metal plate 2 with a thin surface is used to protect the wooden mold 1.
Something covered by this has been devised.

[Problem to be solved by the invention]

However, such a conventional device covered with a metal plate had the disadvantage of poor heating efficiency because the amount of microwaves passing through it was small. In addition, when performing microwave heating, the electric field becomes zero on the metal surface, and the part in contact with the metal is not heated, and at least as shown in Figure 2, from this, λ/
It is not appropriate to use a metal mold because effective heating can only be obtained at a desired location separated by 4 degrees (λ is the wavelength of the microwave).Therefore, a dielectric mold is most appropriate. However, since dielectric materials such as ceramics are difficult to machine, they have had the disadvantage that it is difficult to accurately create complex shapes.

An object of the present invention is to provide a jig suitable for microwave processing and easy to machine.

[Means to solve the problem]

The gist of the present invention is as follows. In other words, the inventor discovered that the material obtained by adding water glass (sodium silicate) and water to calcined gypsum and heating the solidified material is easy to mold by machining, and that this has a usable strength. keep,
Moreover, it was confirmed through experiments that a material that can be machined could be obtained.

That is, the present invention provides a microwave processing jig for heating an object to be heated by holding it therein, including a whole waste pedestal provided on the opposite side to the surface for holding the object to be heated, and a metal pedestal fixed to the metal pedestal. This is a microwave processing jig that emits the wave λ from a metal pedestal surface.

[Effect]

The microwave processing jig constructed in this way uses plaster containing water glass as a material with mechanical strength, so the metal pedestal should be placed on the side opposite to the surface holding the object to be heated. It can be made so that it is sufficient just to provide it. and,
The metal pedestal can eliminate the disadvantages associated with the front λ.

〔Example〕

Examples of the present invention will be described below.

FIG. 3 shows an embodiment of the invention.

In the figure, metal pedestals 10.11 are each provided with molds 13.14 having a predetermined shape.

That is, in a processing jig for holding and heating an object to be heated (not shown), this metal pedestal is fixed to a metal pedestal 10.11 provided on the opposite side of the holding surface of the object to be heated, First, a mold 1 having a predetermined thickness on the side of the object to be heated;
It consists of 3.14. This mold 13.14 is
It is made of gypsum to which water glass has been added, and has an εY (relative dielectric constant) of 4 to 6, which allows microwaves to pass through it sufficiently, so it is formed into a predetermined shape by machining. A molding jig is formed by the metal pedestal 10.degree. 11 and the molds 13 and 14. This forming jig holds the object to be heated in the middle and applies pressure from both sides. As mentioned above, the metal plate is not heated within a quarter wavelength.

In a dielectric body with relative permittivity εγ, the wavelength is 1/4-J”V
It becomes i. Therefore, in order to heat the entire object to be heated surrounded by the forming jig, the forming molds 13 and 14 of this forming jig must be moved from the metal pedestal 10 and 11 side to the object to be heated at least 17,467 degrees. It has thickness.

Therefore, according to this embodiment, when bending or gluing wood, polymerizing and heating plastic (in this case, injecting nanatsuma into a closed mold), or heating and molding food, etc., microwaves can be used. With the structure of this jig, it is possible to achieve a sufficient heating effect and shorten the working time.

〔Effect of the invention〕

As explained above, according to the present invention, it is suitable for microwave processing and can facilitate machining.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of a conventional wooden jig, FIG. 2 is an intensity distribution diagram of a microwave electric field near a metal plate, and FIG. 3 is a structural diagram showing an embodiment of the present invention. 10.11... Metal pedestal, 13.14... Molding mold.

Claims (1)

[Claims] 1. In a microwave processing jig that heats an object by clamping it, there is a metal pedestal provided on the opposite side of the clamping surface of the object to be heated, and a metal object pedestal that is fixed to the metal pedestal and from the surface of the metal pedestal. A microwave processing jig comprising: a mold made of plaster to which water glass is added having a thickness of λ/{4√(εγ)} or more toward the side of the object to be heated.