JPH0363481B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a hot press platen.

Conventional heating plates for hot presses have been heated using steam heat or electric heat, but using steam heat requires large-scale equipment to generate steam, which increases manufacturing costs. It also becomes more expensive,
Moreover, the adjustment range of the heating temperature of the heating platen is extremely narrow, and therefore plywood molding and adhesion of synthetic resin or the like cannot be carried out at low temperatures. In addition, in the case of electric heating using a heater, the heat capacity is small and heating cannot be done quickly. Especially when the workpiece is a small item, only a local part of the heating plate is used, so radiation cooling is increased, and the heat radiation cooling is There was a drawback that the supply was not sufficient, and as a result, the difference in surface temperature of the hot platen became very large, making it extremely difficult to obtain a uniform temperature distribution on the hot platen.

The present invention eliminates the above drawbacks by installing a heat pipe inside the heating plate body, thereby eliminating the need for a large-scale steam generator.
Another object of the present invention is to provide a heating plate for a hot press that is easy to handle, makes the surface temperature distribution of the heating plate uniform, and allows the surface temperature of the heating plate to be adjusted.

Embodiments of the present invention will be described below based on the drawings. 1 is a heating plate body formed into a predetermined shape;
The heating plate body 1 has a plurality of through holes 1a for internally installing heat pipes 3, which will be described later, and the through holes 1a.
A horizontal hole 1b communicating therebetween is bored, and edge grooves 1c are provided at both ends (see FIGS. 2 and 3).
At this time, the edge groove 1c serves as a horizontal hole 1b, and the number of horizontal holes 1b is not limited to one, but a plurality of horizontal holes may be formed. Reference numeral 2 denotes side plates for sealing the edge grooves 1c provided at both ends of the heating plate body 1. Reference numeral 3 denotes a heat pipe installed in each through hole 1a of the heating plate body 1, and the heat pipe 3 includes a heating pipe 3a heated by electric heat and a capillary tube tied around the entire circumference of the heating pipe 3a. A structure 3b, a wire mesh 3c wrapped around the peripheral wall of the capillary structure 3b, a wire mesh 3d with a large wire diameter wrapped around the wire mesh 3c, and an end cap 3.
e (see Figures 4 and 5). To explain in detail the role of the capillary structure 3b and the wire meshes 3c and 3d, the capillary structure 3b is for distributing the working fluid around the entire circumference of the heating pipe 3a by the capillary force of the capillary structure 3b. is used. The wire mesh 3c is used as a presser for attaching ceramic fiber or the like to the heating pipe 3a, and the wire mesh 3d having a large wire diameter is used for moving steam.

After wrapping the wire meshes 3c and 3d as described above, the capillary structure 3b is made to contain working fluid, and the heat pipe 3 in this state is inserted into each through hole 1a of the heating plate body 1 and placed in place. Both end surfaces of the heating pipe are sealed with side plates 2, and an end cap 3e is fixed to the end of the heating pipe from above. At this time, the space between the outer peripheral wall of the heating pipe 3a and the through hole 1a and the side hole 1b are evacuated.
Note that the heat pipe 3 may be a commercially available sealed rod-shaped heat pipe. 4 is a heater attached to the inner diameter of the heating pipe 3a. By adjusting the amount of heat supplied by the heater 4, the amount of heat released from the heat pipe 3 can be freely varied, thereby making it possible to adjust the surface temperature of the hot platen body 1.

Next, to explain the operation of the present invention, heat pipes 3 are installed inside each of the plurality of through holes 1a formed in the heating plate body 1, and when a current is passed through the heat pipes 3, electric heat is generated by the heater 4, etc. The heated pipe 3a conducts heat to the capillary structure 3b containing the working fluid, and the transferred heat turns the working fluid into steam as shown by the arrow in FIG. The steam moves into the space of the wire mesh 3d and further passes through the side hole 1b of the hot platen body 1. Therefore, the evenly distributed steam is radiated to the heating plate body 1, which makes the surface temperature distribution of the heating plate body 1 uniform, and even if the surface temperature drops during local use, the temperature drop will be reduced. A large amount of steam condenses in these localized areas, working to keep the surface temperature constant. Furthermore, the working fluid that has been solidified by radiating heat to the heating plate body 1 accumulates in the wire mesh 3c as shown by the arrow in FIG. Returning to the initial state, this working fluid circulation is repeated to perform heat exchange.

In this way, the present invention has the heat pipe 3 having excellent thermal properties etc. installed inside the heating plate body 1, thereby eliminating the need for large-scale equipment such as a boiler for generating steam, and reducing manufacturing costs. In addition, the shortcoming of hot press heating plates that utilize electric heat, which was the lack of heat supply during local use, is overcome, and the surface temperature distribution of the heating plate body 1 is made uniform, which improves the quality of the material to be processed. By adjusting the amount of heat from the heater 4 supplied to the heat pipe 3, it is possible to adjust the surface temperature of the heating plate body 1, which has many excellent effects such as the ability to mold and bond synthetic resin or other plywood at low temperatures. can get.

[Brief explanation of drawings]

The drawings show an embodiment of the heat plate for hot press according to the present invention, in which Fig. 1 is a perspective view, Fig. 2 is a plan view of the main body, Fig. 3 is a side view of the main body, and Fig. 4 is a heat pipe. 5 is a cross-sectional view of the heat pipe, and FIGS. 6a and 6b are explanatory views of the circulation of the working fluid in the heat pipe. 1...Heating plate body, 1a...Through hole, 1b...Side hole, 3
...Heat pipe, 4...Heater.

Claims (1)

[Claims] 1. A plurality of through holes 1a and a horizontal hole 1b communicating with each of the through holes 1a are formed in the heating plate body 1, and a heat pipe 3 is installed inside each of the through holes 1a, and a heat pipe 3 is provided inside the heat pipe 3. A heating plate for a hot press is provided with a heater 4 for supplying heat, thereby making it possible to make the surface temperature distribution of the heating plate main body 1 uniform and to adjust the surface temperature.