JPH0270401A - Hot press for wood panel production - Google Patents

Abstract

PURPOSE:To shorten bonding time and increase product efficiency of panels by overlapping and constituting a bonding zone provided with a frame and a hot platen and a preheating zone provided with the platen and the frame and using combinedly the platen for both zones. CONSTITUTION:A panel material such as a face material or the like is first preheated in a preheating zone 13 and then fed into a bonding zone 14, and the face material and a frame material are bonded together by actuating an air cylinder 6. As the face material 2 is preheated in the preheating zone 13 of a press prior to bonding with a frame material 1, the time for bonding the frame material can be shortened to increase productivity of bonding to a large extent. Defective bonding because of insufficient heating of the panel material to be likely to happen during the period of winter time can be eliminated. Also it is not necessary to provide a preheater which saves the equipment cost and space, and a platen can be utilized on both of its upper and lower surfaces which is advantageous from the viewpoint of heat energy economy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a hot press for manufacturing wood panels such as residential panels.

[Prior Art] Residential panels, which are generally used for the walls and floors of houses, are manufactured by bonding a face material made of plywood or the like to a frame material made of wood using an adhesive. The method of attaching the face material to the frame material is roughly divided into the cold pressure method, which uses a cold-curing resin to bond at room temperature, and the hot-press method, which uses a thermosetting resin to bond while heating.

The cold pressing method is a manufacturing method in which a face material is placed on a frame material coated with the above-mentioned room temperature curing resin adhesive and crimped with a press.
Since the curing time of the adhesive is long, 15 to 20 minutes, a method is generally used in which a large number of panels of the same shape are grouped together and pressure-bonded at the same time in order to improve production efficiency. This method is suitable for producing large quantities of small quantities of products, but is unsuitable for producing large quantities of a wide variety of products in small quantities.

The hot press method is a manufacturing method that uses a thermosetting resin as an adhesive and presses it while heating. FIG. 3 is a configuration diagram of a conventional hot press used in the hot press method. 1 in the figure is the frame material,
2 is a face material, 3 is a hot press, 4 is a movable surface plate, 5 is a fixed surface plate, 43% 5 a is a frame, 4b and 5b are hot plates,
4Cs5c is a heat insulating layer, and 6 is an air cylinder.

As shown in the figure, the hot press 3 has a frame 4 a
A heat insulating layer 4c is provided between s 5 a and the heating plates 4b and 5b.

5c, a fixed surface plate 5, and an air cylinder 6 for moving the movable surface plate 4. The heat insulating layers 4b and 5b are for preventing adverse effects such as heat from the heating plate being transmitted to the frame and deforming it. In addition, hot plate 4b.

Steam or the like is used as the heat medium of 5b.

In any case, in a conventional hot press, at least 2
Requires individual heating plates.

In manufacturing the panel, the face material 2 is placed on the frame material 1 coated with adhesive on the hot platen 4b of the movable surface plate 4 of the hot press 3, and the air cylinder 6 of the movable surface plate 4 is operated. Then, the movable surface plate 4 is raised and the surface material 2 and the frame material 1 are pressed against the fixed surface plate, and the surface material 2 is adhered to the frame material 1 while heating.After adhesion, the movable surface plate 4 is returned to its original position. Then, the bonded panel is taken out from the movable surface plate 4 and sent to the next process. This is the conventional panel manufacturing method. Note that a manual or a conveyor 7 is used for loading and unloading panel materials and panels into the press 3.

The thermosetting resin adhesive used in the heat-pressing method has the advantage of a wider selection range and shorter curing time compared to room-temperature-setting resins. It takes time for the heat to be transferred to the material, and it is not possible to compress them together using a press, as in the cold pressing method. Therefore, the weak point of the hot pressing method is that it is inferior in productivity compared to the cold pressing method. If a multi-stage press is used to increase productivity, a large amount of capital investment will be required.

In addition, if pressed for a long time in the hot pressing method, there is a risk that the panel may become defective or damaged, and there is also a risk that the temperature of the panel material will drop in winter, causing poor adhesion.

A preheating method has been proposed as a method to compensate for these drawbacks of the hot-pressure method. This method first preheats the face material or frame material,
On top of that, adhesive is applied and pressure bonded. For example, the far-infrared preheater 8 placed on the conveyor 7b in FIG. 3 shows an example of this method, and is a case in which it is placed alongside a hot press for preheating. The frame material 1 can also be preheated in the same way. Unlike the above-mentioned hot-pressing method, since the bonding surface is preheated, this method has the advantage of shortening the bone bonding time and improving production efficiency, but the drawback is that the preheating device requires a large amount of cost.

[Problems to be Solved by the Invention] As described above, in the production of wood-based panels, both the cold pressing method and the hot pressing method have advantages and disadvantages, and it is difficult to decide which method to use. Therefore, a preheating method has been proposed as a way to compensate for the shortcomings of the cold pressing method and hot pressing method, but if a far infrared device is used to preheat the facing material, not only will it require a large amount of equipment cost, but it will also require additional space. Requires. As described above, each of the conventional methods of manufacturing wood panels has its own problems.

The present invention was made in order to solve the problems of the conventional panel manufacturing method described above, and it aims to shorten the bonding time in the heat pressure method using a thermosetting resin adhesive with a wide range of selection, thereby making it possible to form panels. The objective is to provide a hot press that not only makes it possible to improve production efficiency but also does not require large equipment costs or extra space.

[Means for Solving the Problems] In order to achieve the above object, the hot press according to the present invention has a bonding zone including a frame and a heating platen, and a preheating zone including a heating platen and a frame, which overlap each other. The heating plate was shared by both zones.

[Function] Since the hot press is configured as described above, when manufacturing a panel, it is possible to first preheat the face material etc. in the preheating zone, and then bond the face material and frame material in the adhesion zone, which reduces the adhesion time. can be shortened. In addition, both the top and bottom of the heating platen of the press can be used for heating, which not only saves energy, but also eliminates the need to install a dedicated preheating device in a separate location from the press, and allows the preheating zone and bonding zone to overlap. Since the panels are shared, equipment space is saved and only one heating plate is required instead of the conventional two, significantly reducing equipment costs.

[Embodiment of the Invention] Fig. 1 is a configuration diagram of a hot press showing an embodiment of the present invention, in which 1 is a frame material, 2 is a face material, 7d to 7g are conveyors,
10 is a frame, 11 is a heating plate, 12 is a fixed frame, 1
3 is a preheating zone, and 14 is a bonding zone.

As shown in the figure, a heating platen 11 is arranged on the upper part of the frame 10, a bonding zone 14 is formed by the frame 10 and the heating platen 11, and a preheating zone 13 is formed by the heating platen 11 and the frame 12 arranged above it. is forming.

In manufacturing panels, panel materials such as face materials are first preheated in the preheating zone 13, and then charged into the bonding zone 14.
The air cylinder 6 is operated to bond the face material and the frame material.

Since the face material 2 is preheated in the preheating zone 13 of the press before being bonded to the frame material 1, the bonding time can be shortened when bonding to the frame material, greatly improving bonding productivity. can be done. Also, the fear of poor adhesion caused by insufficient heating of panel materials, which often occurs during the winter, has been eliminated. In addition, there is no need to provide a separate preheater, saving equipment costs and equipment space, and since both the upper and lower sides of the heating plate can be used, it is also advantageous in terms of thermal economy.

In this example, when bonding a panel material to one side of a frame material, only one side of the panel material is preheated, but various preheating methods can be considered depending on the specifications of the panel and the bonding conditions.

FIG. 2 shows another such embodiment.

That is, in (a), a heating plate 17 is attached to the upper frame 15 via a heat insulating layer 16, and since the face material 2 can be heated from both the upper and lower sides, the preheating time can be accelerated and the preheating temperature can be increased.

In (b), another heating plate 11a is placed on top of the heating plate 11, and it may be considered that there is a face material 2 instead of the heat insulating layer 16 in (a). The plan is to preheat the face material 2 twice.

(c) is used when manufacturing a panel in which the facing material 2 is bonded to both sides of the frame material 1. In the above (b), the adhesive zone is between the heating platen 11 and lla, and the heating platen 11 and the frame The area between 10 and 10 is defined as a preheating zone.

Note that although the above embodiment is an example of preheating the face material, the preheating of the frame material can be performed in the same way.

[Effects of the Invention] The present invention provides a hot press used for manufacturing a wooden panel in which a facing material is adhered to one or both sides of a frame material.
Since the adhesion zone and preheating zone are superimposed and the heating plate is shared by both zones, the time required to bond the face material and the frame material is shortened, and the productivity of panel manufacturing is greatly improved. This has resulted in excellent results, greatly contributing to lowering capital investment and reducing equipment space.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a hot press showing one embodiment of the present invention, FIG. 2 is a block diagram of another embodiment, and FIG. 3 is a block diagram of a conventional hot press. In the figure, 1 is a frame material, 2 is a face material, 3 is a hot press, 10 is a movable frame, 11 is a heating plate, 12 is a fixed frame, 13 is a preheating zone, and 14 is an adhesive zone. Figure 2 (b) (C) Agent Patent attorney Souji Sasaki

Claims (1)

[Claims] A hot press for manufacturing a wooden panel made by bonding a facing material to one or both sides of a frame material includes a bonding zone equipped with a frame and a heating plate, and a preheating zone equipped with a heating plate and a frame. 1. A hot press for manufacturing a wood-based panel, characterized in that the hot press is formed by overlapping the zones, and the hot platen is shared by both zones.