JPH0536682Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a release plate for a plywood hot press, which has a cushion function and is used in a hot press for pressing when bonding plywood.

(Prior art) Conventionally, release plates for plywood hot pressing are simply aluminum plates treated with fluorine resin, films (polyester, etc.), silicone rubber plates, etc., and when manufacturing plywood, adhesiveness is improved in the bonding process. To improve this, a hot press is used that presses a large number of stacked sheets of plywood while heating them. When using this hot press, plywood is stacked between the iron hot plates 2a placed above and below it, and the release plate 1 is clamped to the hot plate 2a on the hot press so that the plywood and the hot plate 2a do not stick together. 5 (see Figure 3).

(Problems to be solved by the invention) However, since the conventional release plate 1 is simply an aluminum plate, rubber or plastic film,
When attaching the mold release plate 1 to the hot plate 2a of the hot press, it is necessary to use the clamp 5, which takes time and effort, and the periphery of the mold release plate 1 must be clamped to attach the mold release plate 1 to the hot plate 2a. 5, the center of the mold release plate 1 attached to the upper hot plate 2a hangs down due to its own weight and becomes separated from the hot plate 2a, as shown in FIG. Therefore, the heat of the hot plate 2a is not directly conducted to the entire surface of the mold release plate 1, and even if the plywood is pressed by the upper and lower hot plates 2a and the hot plate 2a and the mold release plate 1 come into full contact for the first time, the mold cannot be released. The temperature of the plate 1 did not immediately rise to the desired heating temperature, and it was necessary to wait several tens of seconds, and this waiting time was wasted, impairing work efficiency.

The present invention was made in order to solve the above-mentioned conventional problems, that is, it uses magnetic force to facilitate the attachment of the mold release plate 1, and when it is attached to the hot plate 2a, it is always connected to the hot plate 2a. The purpose is to provide a mold release plate 1 that continues to maintain the same temperature.

(Means for Solving the Problems) The means for achieving the above object will be explained using figures corresponding to embodiments. At least one side of a magnet sheet 1a made of rubber or plastic mixed with iron oxide, A releasable material 1b such as a releasable film or a releasable rubber is adhered thereto.

(Function) According to the present invention, in order to attach the mold release plate 1 to the upper and lower hot plates 2a of the hot press 2 by the above-mentioned means, the mold release plate 1 can be attached as it is because the mold release plate 1 has magnetic force. If each is brought into contact with the hot plate 2a,
The entire surface is easily magnetically attached to the hot plate a. Since the magnetically attached mold release plate 1 is in full contact with the hot plate 2a, it is always maintained at the heating temperature of the hot plate 2a. Further, a release material 1b is adhered to the release plate 1, and the release plate 1 is magnetically attached to the hot plate 2a so that the surface of the release material 1b always comes into contact with the plywood. Therefore, the mold release material 1b
Therefore, even when the pressing of the plywood 3 is finished and the upper and lower hot plates 2a are opened, the release plate 1 does not stick to the plywood 3, and the release plate 1 always remains magnetically attached to the upper hot plate 2a. be.

(Example) Examples of the present invention will be described below based on the drawings.
Reference numeral 1 denotes a release plate, and the release plate 1 includes an elastic magnet sheet 1a made of rubber or plastic mixed with iron oxide and molded into a sheet shape, and a release material 1b adhered to one side of the magnet sheet 1a. It consists of
Natural or artificial rubber may be used as the rubber of the magnet sheet 1a, and polyester, vinyl chloride, or the like may be used as the plastic, but the material is not limited thereto. In addition, the ratio of rubber or plastic to iron oxide should normally be approximately 15% by weight of rubber or plastic and 85% by weight of iron oxide. As the release material 1b, a fluorine resin film, silicone rubber, fluorine rubber, or the like is used. Release material 1b
After bonding, the release plate 1 is permanently magnetized by an electromagnet. 2 is a hot press, and the hot press 2
has iron hot plates 2a for pressing arranged above and below,
In the one shown in FIG. 2, the lower heating plate 2a moves up and down. 3
is plywood, 4 is a cushion material attached to the lower heating plate 2a, and 5 is a clamp. The release material 1b is usually adhered to one side of the magnet sheet 1a, but may be adhered to both sides. When the releasable film 1b is adhered to both sides of the film, when it is magnetically attached to the hot plate 2a,
Unlike single-sided mold-releasing material 1b, magnetic attachment can be performed without worrying about the directionality of the mold-releasing material 1b.

(Effect of idea) As described above, the present invention has the following effects.

Because the mold release plate 1 has magnetism, the hot press 2
When it is attached to and removed from the hot plate 2a, it can be magnetically attached as it is, eliminating the need for attachment tools such as the clamp 5 used in conventional attachment, and therefore saving time and effort.

In the state where no pressure is applied as in the conventional case, the upper hot plate 2a
The center of the mold release plate 1 hangs down due to its own weight, and the hot plate 2
The release plate 1 of the present invention magnetically attaches to the hot plate 2a in close contact with the entire surface of the hot plate 2a, so that the heat of the hot plate 2a is not conducted and heat loss occurs. The temperature is constantly maintained over the entire surface and the temperature distribution is also uniform. Therefore, when pressing the plywood 3, the heating of the plywood 3 is improved, the pressing process of the plywood 3 by the hot press 2 can be performed faster than before, and the mounting is uniform.

By adhering the release material 1b to the release plate 1, the release plate 1 does not stick to the plywood 3 even when pressed, and therefore the attachment of the release plate 1 to the hot plate 2a is faster than the conventional method. Even if the magnetic attachment is weaker than that of the clamp 5, the mold release plate 1 always maintains its magnetic attachment to the hot plate 2a, and does not adhere to the plywood 3 side and come off from the hot plate 2a.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is an explanatory view showing how it is used, and FIG. 3 is an explanatory view showing how a conventional release plate is used. 1a... Magnet sheet, 1b... Release material.

Claims (1)

[Scope of utility model registration request] A release plate for plywood hot pressing, characterized in that a release material 1b such as a release film or release rubber is adhered to at least one side of a magnetic sheet 1a made of rubber or plastic mixed with iron oxide.