JPH0369699B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for bonding a vinyl chloride leather sheet to the outer peripheral surface of a container having an opening.

Conventionally, the process of laminating a leather sheet made of pineyl chloride (hereinafter simply referred to as a leather sheet) to the outer circumferential surface of a container having an opening (hereinafter simply referred to as a container) has been to first form a container, and then apply leather to the outer periphery of the container. This is done by pasting sheets together, but if this is done manually, not only is it time-consuming, but it can also cause wrinkles and air pockets unless the operator is very skilled. Therefore, it was difficult to make the product uniform. Furthermore, if a dedicated bonding device were to be developed and installed, a large amount of economic expenditure would be unavoidable, and the reality is that automation has not been implemented. Therefore, the present invention aims to contribute to the development of the plastic processing industry by simply and rationally laminating leather sheets using an existing plastic vacuum forming machine.

That is, the present invention utilizes an existing plastic vacuum forming machine consisting of an elevating table, a mold, a vacuum pump, and other components to attach a leather sheet to the outer circumferential surface of a container, and inserts the container into the mold. At the same time as fitting the openings, before or after fitting, adhesive is applied only to the outer surface of the container except for the bottom surface, while a leather sheet is stretched horizontally on the clamp frame and heated by a heater. The leather sheet is heated from below, and after heating, the elevating table is immediately raised to push up and extend the leather sheet, and the vacuum pump is activated to apply pressure to the leather sheet by the container and the suction force of the vacuum pump. Therefore, the leather sheet is pasted on the outer circumferential surface of the container.

Next, embodiments of the present invention will be described based on the drawings.

Figure 1 is a cross-sectional view of a container covered with a leather sheet as a product; 1 is a plastic container made by inkjet extrusion molding;
B indicates a leather sheet, 9 indicates a molding, and A indicates a product container.

FIG. 2 is a cross-sectional illustration of the configuration of the vacuum forming machine used in the present invention, in which a lifting table 3 is provided at the tip of a cylindrical push-up rod 6, and a hollow forming mold is mounted on the upper surface of the lifting table 3. Place and fix 2. Each of these members is configured to be moved up and down at predetermined intervals by a lifting mechanism (not shown), and the mold is detachably attached as required. Vacuum vent holes 7 are bored at necessary locations in the mold 7, and communicate with a vacuum pump connected to the other end of the push-up rod 6. Since the vacuum holes 7 are for suctioning the leather sheet, a plurality of them are bored near the opening edge of the container 1 when the container 1, which is a member to be bonded, is fitted into the mold 7. However, if a recess is formed in the container 1 itself, it is necessary to drill at a location corresponding to the recess (see FIGS. 4 and 8). Further, an on-off valve 8 is provided inside the cylindrical interior of the push-up rod 6 to adjust the suction state.

Reference numeral 4 indicates a clamp frame that holds the leather sheet to be processed, and reference numeral 5 indicates a heater that heats the leather sheet. When the push-up rod 6 is lowered to the lowest position, the heater 5 connects the clamp frame 4 and the molding die. It has a reciprocating mechanism that can move left and right in the drawing so that it can be inserted into the gap between the two.

Now, how to bond leather sheets using such a vacuum forming machine is as follows.

First, a synthetic rubber adhesive or cyanoacrylate adhesive D is applied with a brush or the like to the four outer surfaces 1a of the in-die extension molded or press-molded container 1, excluding the bottom surface (see Figure 3), and then the following is applied. The container 1 coated with adhesive in this manner is fitted onto the mold 2 as shown in FIG. Of course, at this time, in order to prevent the container 1 from shifting laterally, the mold 2 is
Prepare in advance so that it matches the inner shape of.

After the container 1 is fitted into the mold 2, the lifting table 3 is lowered to the lowest position, and the leather sheet B is stretched and held by the clamp frame 4 with the leather-treated surface facing upward. (See Figure 5) Next, move the heater 5 below the leather sheet (see arrow a in Figure 6) to heat the leather sheet B from below. , immediately retract the heater 5. (See arrow b in Figure 6)Although not shown in the drawings, if it is not a problem that the leather processed surface of the leather sheet B is softened and deformed by heating, it may be configured to heat the leather sheet B from above. do not have.

Thereafter, the lifting table 3 is immediately raised as shown in FIG. Aspirate B. The leather sheet B is strongly bonded to the outer peripheral surface of the container 1 due to the pressure from the container and the suction force of the vacuum pump.

After the pasting is completed as described above, as shown in FIG.
The leather sheet B held therein is cut, and the container to which the leather sheet B is pasted is removed from the mold 2. As the final finishing step, the cut edge of the leather sheet B attached to the container 1 is trimmed and bent inside the opening edge of the container 1 (see Figure 1), and then glued with a synthetic rubber adhesive. At the same time, the molding 9 is placed over the edge of the opening. (See FIG. 9) Although the above is an example of the implementation of the present invention, the step of applying the adhesive to the outer peripheral surface of the container 1 may be performed after the container 1 is fitted into the mold 2.

In the present invention, since the leather sheets are bonded together by the method described above, even an unskilled person can easily and quickly bond the leather sheets. Moreover, since the process is carried out using an existing vacuum forming machine, the usability of the vacuum forming apparatus is increased, and the economic value is great.

Furthermore, since the adhesive is applied to the outer surface of the container to be bonded, excluding the bottom surface, wrinkles and floating (air pockets) are less likely to occur, and tight bonding is possible. The pattern created is fully utilized.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a manufactured container with leather sheets pasted on it, Figure 2 is a cross-sectional view showing the configuration of a vacuum forming machine, and Figure 3 is a perspective view of the container with adhesive applied to it. , FIG. 4 is a sectional view showing a container coated with adhesive placed in a vacuum forming machine, FIGS. 5 to 7 are process explanatory diagrams showing embodiments of the present invention, and FIG. FIG. 9 is a perspective view showing the state in which the container with the leather sheet pasted thereon is removed from the mold, and FIG. 9 is a perspective view of the container with the leather sheet pasted thereon as a product. DESCRIPTION OF SYMBOLS 1... Container, 1a... Outer surface of the container, 2... Molding mold, 3... Lifting table, 4... Clamp frame,
5...Heater, 6...Pushing rod, 7...Vacuum vent, 8...Opening/closing valve, 9...Mall, A...Product container with leather sheet pasted, B...Leather sheet, D... glue.

Claims (1)

[Claims] 1 Consists of a lift table provided at the tip of a cylindrical push-up bar, a hollow mold placed on the top surface of the lift table, and a vacuum pump connected to the other end of the push-up bar, The vacuum pump is connected to a vacuum vent hole drilled at an appropriate location, and a clamp frame for holding the sheet material is provided above the mold, and the sheet material is further held by the clamp frame below the clamp frame. A method of bonding a vinyl chloride leather sheet to the outer circumferential surface of a container with an opening using a plastic vacuum forming machine equipped with a heater that can move horizontally to heat the sheet material from below. The container having the opening is fitted into the mold, and an adhesive is applied only to the outer surface of the container before or after the fitting, while the clamp frame is made of vinyl chloride. A leather sheet is stretched horizontally, the heater is advanced to heat the leather sheet from below, and after the heating is finished, the heater is moved back, and then the elevating table is immediately raised to push up the leather sheet. performing the elongation and activating the vacuum pump;
A bonding method characterized in that a leather sheet is bonded to an outer circumferential surface of a container by pressing the leather sheet with the container and suction force of the vacuum pump.