JPS60192617A - Vacuum laminating device - Google Patents

Abstract

PURPOSE:To obtain a product which can be stuck sincerely to a product pattern and is uniform in quality by a method wherein the lower opening part of a box- type push member is covered with an elastic sheet, liquid fluid used as heating medium also is supplied into this box-type push member and the inner part of the box-type retaining member is vacuumized and sucked. CONSTITUTION:A pair of airtight chambers which are partitioned up and down through a decorative sheet 4 are provided. In this state the hot air supply device 8 is opened, the decorative sheet 4 is softened by heating and swollen upwards. Continuously, the valve is changed over to the vacuum suction device side to keep the inner part of the lower airtight chamber in a vacuumized state, the motor 16 and the pump 15 are driven, the changeover valve 13a is opened and the inner part of the push member 9 is filled with heated silicone oil 19 of the oil tank 17. Accordingly, the vacuumized and softened decorative sheet 4 is stuck in one body to the surface of the base plate 3 through the adhesive agent heated and compressed by the silicone oil 19 and applied to the lower surface of the decorative sheet 4.

Description

[Detailed Description of the Invention] This invention is a vacuum cleaner that enables a decorative sheet made of thermoplastic resin with appropriate colors, printing, etc. to be adhered and molded faithfully along the product model onto a substrate that serves as the product model. Regarding a laminating device.

This type of vacuum laminating apparatus was previously developed by the present inventor in Japanese Patent Publication No. 58-13352. However, in this vacuum lamination method, when the substrate is made of a porous material such as wood, the effects described in the same publication are achieved, but when the substrate is made of metal or plastic, If the surface of the substrate is not porous, the decorative sheet will not fully penetrate into the fine irregularities and deep grooves carved into the substrate, and air pockets will form in various places on the substrate. Therefore, it is difficult to say that adhesive molding is performed faithfully to the original shape of the product.

Therefore, the present inventors have previously developed a vacuum lamination method called RRL, which enables the above-mentioned sheet to be adhered reliably and accurately to a substrate having a non-porous surface such as metal or plastic, depending on the surface shape of the substrate.

Ta. (Japanese Patent Application No. 58-123020) However, in this method, in the stage before the compressed air vacuum process,
This method applies vacuum suction to both the upper and lower airtight areas at the same time, and even when the material of the substrate is metal or plastic, it can be vacuum-sucked without creating air bubbles.
It has the characteristic that the decorative sheet can be attached faithfully along the original shape of the product.

However, since the above method uses heated and compressed air to apply pressure, if the substrate has a complex uneven shape, the pressing force is small, so it is not always possible to adhere the sheet faithfully along the product model. Experiments subsequently revealed problems such as the inconsistency of the product due to the inability to maintain air temperature and the difficulty in controlling the temperature of the air.

This invention was made in view of these points, and aims to obtain a product that can be adhered faithfully to the original shape of the product and of uniform quality by applying a higher pressure than air pressure. It is.

In order to achieve the above objects, the present invention covers the lower opening of a box-shaped pressing member with an elastic sheet that is highly heat-resistant, oil-resistant, and pressure-resistant, and also injects a heating medium such as silicone oil into the box-shaped pressing member. This device is characterized by supplying a liquid fluid that also serves as a device and vacuuming the inside of the box-shaped support member.

Embodiments of the present invention will be described in detail below with reference to the drawings.

Reference numeral 1 denotes a belt conveyor-type mounting table, and this mounting table 1 has a large number of small holes 2 perforated therein, and a peeling layer of adhesive coated with a surfactant or the like is formed on the surface. Further, on this mounting table 1, a substrate 3 which is to be a product model and which has various uneven shapes on its surface is placed. 4
is a decorative sheet made of thermoplastic resin, which is located above the substrate 3. An adhesive is applied to the bottom surface of this sheet 4 to bond it to the substrate 3, and the surface of this decorative sheet is coated with an adhesive. Appropriate patterns such as wood grain patterns and checkered patterns are applied. This decorative sheet 4 is supplied from a winding roll (not shown) so as to be continuously fed out in synchronization with the substrate 3.

A box-shaped support member 5 whose upper surface is an opening is disposed below the mounting table 1, and a vibro extends downward from the center of the bottom of the box-shaped support member 5. This vibro is branched in the middle and connected to a vacuum suction device 7 and a hot air supply device 8, respectively.

On the other hand, above the decorative sheet 4, a box-shaped pressing member with an opening at the bottom is disposed, and at the lower opening of the box-shaped pressing member, an elastic sheet 9a having high heat resistance, oil resistance, and pressure resistance is provided. For example, an elastic sheet made of silicone rubber is fixed to cover the lower surface. Moreover, this box-shaped pressing member 9
is moved up and down by hydraulic pressure or a piston of an air cylinder 10, and this box-shaped pressing member 9 is disposed facing above the box-shaped support member 5, and when it is lowered, there is a substrate 3 inside. The decorative sheets 1 to 4 are held therein to form an airtight chamber divided into upper and lower sections.

Holes 11.12 are provided in the side wall of the box-shaped pressing member 9, and pipes 13.14 are connected to these holes 11.12. The path of the pipe 13 includes a switching valve 13a and a pump 15. The tip of the pipe 14 faces the oil storage tank 17 via the motor 16, and the pipe 14 is connected to the switching valve 18.
The oil storage tanks 17 each contain a liquid fluid 19 such as silicone oil that also serves as a heat medium, and this liquid fluid 19 is connected to the heater 2.
1 is heated to 150°C to 200°C.

Further, an auxiliary heater 21 is provided on the upper surface of the box-shaped pressing member 9. Note that 22 in the figure is a support member for supporting and moving the cylinder 10, and this support member 22 is fixed to a base frame (not shown).

Next, the operation of the vacuum laminating apparatus configured as described above will be explained.

The one shown in FIG. 1 is in a non-operating state, and the box-shaped pressing member 9 is positioned upward by the operation of the cylinder 10, while the belt conveyor moves intermittently at predetermined time intervals. A decorative sheet 4 is a substrate 3 that is continuously placed on the mounting table 1 by any means (not shown).
It also moves forward and stops at a position above the opening of the box-shaped support member 5. It goes without saying that the auxiliary heaters 21, 21, . . . are heated by being energized.

Subsequently, the cylinder 10 is actuated to lower the box-shaped suppressing member 9, and its lower end opening holds the edge of the decorative sheet 4 between the upper edge of the box-shaped supporting member 5 and the mounting table. Hold 1.

In this way, a pair of airtight chambers are formed that are airtightly partitioned vertically through the decorative sheet 4 as shown in FIG. 2. In this state, the hot air supply device 8 is operated and the When the cock is switched to the hot air supply device 8 side, the decorative sheet 4 is heated and softened, and the upper part of the sheet 4 bulges out as shown by the dashed line (not shown in FIG. 1). When the decorative sheet 4 has softened to some extent, the supply of hot air is stopped.

Next, when the cock (not shown) provided at the branch point of the vibro is switched to the vacuum suction device 7 side, the air filled in the upper and lower airtight chambers is removed from each airtight chamber, and the upper and lower airtight chambers are respectively evacuated. state.

Once a certain degree of vacuum has been achieved in the airtight chamber, the lower airtight chamber is maintained in a vacuum suction state, and the motor 16. While operating the pump 15, the switching valve 1
3a is opened and heated silicone oil 19 from the oil storage tank 17 is filled into the pressing member 9. Then, the decorative sheet 4, which has been vacuum-suctioned and softened, is heated and pressurized by the silicone oil 19, and is integrally attached to the surface of the substrate 3 via the adhesive applied to its lower surface. The Rukoto.

At this time, even if the substrate 3 is made of metal or plastic material, or even if there are deep recesses or fine irregularities carved into it,
The decorative sheet 4 can be reliably adhered to the substrate 3 via the elastic sheet 9a, and since a liquid fluid such as silicone oil that also serves as a heat medium is used, the pressing force is extremely high compared to air pressure, and therefore the substrate Even if 3 has a fine uneven pattern, it can be stuck more reliably and integrally.

Incidentally, it goes without saying that the switching valve 18 is set to be a lever during operation.

After the pressurization step is completed, when the switching valve 13a is closed and the switching valve 18 is opened, the silicone oil 19 in the suppressing member 9 is transferred to the oil storage tank 17 via the pipe 14 due to the back pressure in the member 9. It will be returned to.

After the pressurization step is completed, the pressure in both airtight chambers is returned to normal pressure, and then the suppressing member 9 is pulled upward by the operation of the cylinder 10, and then the mounting table 3 is moved forward. here,
In the next step, cold air is blown out from a blower duct (not shown) to cool the board 3 to which the decorative sheet has been adhered, and after cutting off the unnecessary sheet between the front board 3 and the back board 3, it is placed in a designated place. It will be carried away.

In the above embodiment, silicone oil was used as the liquid fluid that also serves as a heat medium, but the present invention is not limited to this silicone oil, and it goes without saying that other liquid fluids may be used. .

As is clear from the above description of the embodiments, the apparatus of the present invention is configured to heat and pressurize the decorative sheet in place of the conventional heating and compressed air methods.
Since the pressing force is extremely high and the decorative sheet can penetrate even into the substrate with minute irregularities, it is possible to obtain a product with an excellent appearance.

Furthermore, since the temperature of silicone oil and the like is easier to control than that of air, there is no variation in the resulting products, and products of uniform quality can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main parts of the device of the present invention in a non-operating state;
FIG. 2 is a sectional view showing the operating state of the device of the present application. 1... Mounting table 3... Substrate 4... Decorative sheet 5... Box-shaped support member 7... Vacuum suction device 8... Hot air supply device Q ,,, m if jolI rr-M neo 13.
14...Pipe 17...Oil storage tank 19...Liquid fluid that also serves as a heat medium 21...Heater device 9a...Elastic sheet having heat resistance, oil resistance, and pressure resistance Patent applicant Rizo Rikino Nakano Kakogyo Co., Ltd. Figure 1

Claims (1)

[Claims] (1) In an apparatus having a vertically movable box-shaped pressing member and a box-shaped supporting member that are arranged vertically opposite each other via a mounting table having a large number of small holes, a pair of plates that cover the lower opening of the box-shaped pressing member are provided. An elastic sheet having heat, oil and pressure resistance, a supply means for supplying a liquid fluid which also serves as a heating medium into a box-shaped pressing member airtightly partitioned by the elastic sheet, and a space between the box-shaped support member and a mounting table. a vacuum suction means for vacuum suctioning the air in the compartment formed by the vacuum chamber, and a means for heating and softening the thermoplastic resin sheet on the substrate placed on the mounting table. Laminating v device.