JPS595525Y2 - Multi-stage hot press heating plate - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hot plate of a multi-stage hot press for imparting uniform temperature conditions to plate bodies such as plywood and fiberboard.

Normally, in order to heat and compress the plate 1, each heating plate 2 is provided with a heating medium that supplies a fluid heating medium such as steam, hot water, heating oil, etc., or a solid heating medium such as a heater, as shown in FIG. A plurality of passages 3 are perforated vertically and horizontally at predetermined intervals, and in the case of a fluid heating medium, it is circulated from the supply port 4 of the heating medium passage 3 to the discharge port 5, and in the case of a solid heating medium,
The heating plate 2 is directly installed in the heating medium passage 3 to maintain the hot plate 2 at a desired temperature.

As shown in FIG. 2, the plurality of hot plates 2 having the heating medium passages 3 perforated with the same specifications are connected to the upper frame 8 and the lower frame 9 via the struts 7 of the multi-stage hot press 6. The movable platen 12 is arranged vertically oppositely, and is fixed to the lower surface of the upper frame 8 and the upper surface of a movable platen 12 that can be raised and lowered by a ram 11 of a fluid cylinder 10 installed on the lower frame 9, and a plurality of stages are equally spaced between them. The plurality of plate bodies 1 placed between the respective hot plates 2 are heat-pressed by the vertical movement of the fluid cylinder 10.

However, the fluid cylinder 10 of the multi-stage hot press 6
When the movable platen 12 is raised by the movable platen 12, the heating medium passages 3, which are perforated in multiple rows vertically and horizontally, are in the same phase in the vertical direction in the plurality of heating plates 2 that are vertically close to each other through the plate body 1.
As shown in FIG. 3, the temperature distribution of the hot plates 2 located above and below, which are heated and pressed, is such that the desired high-temperature areas 13 and low-temperature areas 14 are divided uniformly and alternately in the vertical direction, and this temperature Due to the non-uniform distribution, defects such as uneven thickness and uneven adhesion occurred in the plate 1 subjected to the heat-pressing process.

In view of the above diagonal description, the present invention is designed to provide heating medium passages 3 in the heating plates 2 arranged in multiple stages of the multi-stage hot press 6 without uniformly perforating all the stages, and instead aisle 3
are perforated horizontally with a required amount of phase shift to equalize the temperature distribution in each set of upper and lower hot plates 2, thereby ensuring a good finish for the plate 1 to be heat-pressed. An embodiment of the present invention will be described below with reference to the accompanying drawings.

For the plurality of vertical and horizontal rows formed as the heating medium passages 3 in the hot plate 2, heating medium passages 3' are perforated with a phase shift in the horizontal direction by approximately half a pitch between each row, as shown in FIG. The hot plates 2 that have been heated are placed at adjacent positions below them.

That is, in the multi-stage hot press 6 described based on FIG. 2, the hot plate 2 consisting of a plurality of stages located at the top, bottom, and in between each has a passage supplying a heating medium at a position adjacent to the top and bottom. For example, in the illustrated example in which the total number of stages is five, the odd-numbered top, third, and bottom heating plates 2□.

23.2s and 2° each of the 2nd and 4th even numbered hot plates
, 24 are vertically adjacent to heating medium passages 3 and 3' which are horizontally shifted in phase by approximately half a pitch.

As described above, a plurality of sets of hot plates 2 are made by drilling heating medium passages 3 and 3' which are horizontally shifted in phase by a required amount, and are arranged for each diaphragm of the multi-stage hot press 6. If this is done, the temperature distribution on any set of upper and lower heating plates 2 will be uniform, and the temperature state where each heating plate 2 is uniformly divided in the upper and lower directions will be wiped out, and the temperature distribution on each set of upper and lower heating plates 2 will be wiped out. The finish of the body 1 is maintained well.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway circuit diagram of a hot plate, Fig. 2 is a schematic front view of a multi-stage hot press, Fig. 3 is an explanatory diagram showing the temperature distribution of a conventional hot plate, and Fig. 4 is a heating plate of the present invention. It is an explanatory view showing temperature distribution of a board. 1... Plate body, 2... Hot plate, 3, 3'... Heating medium passage, 6... Multistage hot press.

Claims (1)

[Claims for Utility Model Registration] 1. A multi-stage hot press consisting of a plurality of heating plates arranged at equal intervals, including a plurality of heating medium passages perforated in a plurality of rows at predetermined intervals in the heating plates; Shifting the phase of the heating medium passage bored in the hot plate adjacent to the horizontal direction by the required amount,
A hot plate for a multi-stage hot press, characterized in that the temperature distribution on each set of upper and lower hot plates is made uniform. 2. A hot plate for a multi-stage hot press according to claim 1, in which the required amount of phase shift in heating medium passages bored in each set of upper and lower hot plates is set to half a pitch.