JPH0367018B2 - - Google Patents

Abstract

PURPOSE:To enable to weld stably and favorably, by a method wherein a shutter cutting off and permitting passage of hot air is provided at a position in proximity to a hot-air blow-off port of a hot-air welding machine, in a surface treatment for welding a sheet form synthetic polymer material onto a surface of a molded article. CONSTITUTION:An anti-slip material 13 intermittently fed out of a magazine device 17 is fed to a predetermined position through a feeding guide 16. On the other hand, when a pallet 11 which is a synthetic resin molded article conveyed by a conveyor 12 is detected, a main body 24 of a guide support is lowered, a protruding rod 19 is disengaged and a movable guide plate 18 is rotated by a spring 37, whereby the anti-slip material 13 is bent so that an end part thereof is located at a position beneath a press roller 14, and simultaneously, the shutter 39 cutting off a flow of hot air from the hot- air blow-off port 20 is moved by an air cylinder, and the anti-slip material 13 is welded to the pallet 11 by heating by hot air and pressing by the roller 14. When welding is completed, the shutter 39 is returned while the magazine device 17 starts to supply the next material. Accordingly, welding can be conducted stably and favorably without heating any unrequired part.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a surface treatment apparatus for synthetic resin molded articles, and more particularly to an apparatus for melt-pressing a sheet-like synthetic polymer material onto the surface of a synthetic resin molded article.

Synthetic resin molded products have excellent properties and are used for boxes, bottles,
Widely used as pallets. However, it is already well known that synthetic resin molded articles are slippery, and while this property may be advantageous at times, it may also be a disadvantage in some cases.

In order to prevent slippage in such synthetic resin molded products, a technique is developed in which a non-slip material made of a sheet-like synthetic polymer material is firmly installed on the surface of the synthetic resin molded product by hot air welding using a hot air welding machine. Also, JP-A-53-123477, JP-A-57-
It is publicly known as disclosed in Publication No. 46831 and the like.

However, in the case of welding an anti-slip material made of a sheet-like synthetic polymer material to the surface of a synthetic resin molded product, the conventional surface treatment apparatus for synthetic resin molded products disclosed in the above-mentioned publication does not allow the anti-slip material to be made of synthetic resin. The main focus is on welding from near the edges of the molded product.

For this reason, for example, even when it is desired to weld an anti-slip material from the middle of the surface of a synthetic resin molded product, the anti-slip material is not originally welded, that is, the part of the surface of the synthetic resin molded product that does not need to be melted is heated and melted. This results in a decrease in product strength due to thermal history,
This may cause a decrease in weather resistance, deterioration of the surface condition, generation of distortion, etc.

To prevent this, for example, you can operate a hot air welding machine intermittently to prevent the hot air from hitting any areas other than the designated areas of the synthetic resin molded product.
One possible method is to change the moving speed of the synthetic resin molded product so that it passes quickly beyond the designated areas, but the former method is inconvenient because the temperature of the hot air from the hot air welding machine will not be stable, and the latter method is inconvenient. In this case, the machine becomes complicated, and the above-mentioned defects such as a decrease in strength due to the thermal history cannot be completely eliminated.

An object of the present invention is to provide a synthetic resin that can be welded in a good and stable manner from the middle of a synthetic resin molded product when press-fusing a sheet synthetic polymer material to the surface of a synthetic resin molded product. An object of the present invention is to provide a surface treatment device for resin molded products.

That is, the gist of the present invention is a surface treatment device for welding a sheet-like synthetic molecular material onto the surface of a synthetic resin molded article, which comprises: a conveyor device that transports the synthetic resin molded article in a fixed direction; a roller that presses a material onto the surface of the synthetic resin molded product; and a roller that is supported in the vicinity of the pressing roller so as to face the pressing roller in order to heat the surface of the synthetic resin molded product and the sheet-like synthetic polymer material. The hot air welding machine includes a hot air welding machine having a hot air outlet, and a feeding guide for feeding the sheet-like synthetic polymer material between the press roller and the synthetic resin molded product. Near the exit,
The present invention relates to a surface treatment apparatus for synthetic resin molded products, characterized by being provided with a shutter for blocking/passing hot air.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The surface treatment apparatus for synthetic resin molded articles of the present invention will be described in more detail below with reference to preferred embodiments shown in the accompanying drawings. Note that this example shows an apparatus for fusing a sheet-like anti-slip material made of a synthetic polymer material to the surface of a pallet as an example of a synthetic resin molded product. The pallet and the sheet-like synthetic polymer material are simply referred to as the sheet-like anti-slip material.

Figures 1 to 3 are front views showing the surface treatment apparatus for synthetic resin molded products of the present invention according to the operating order, and Figure 4 shows a part of the shutter part and pressure roller part of the apparatus shown in Figure 1. It is an enlarged perspective view.

In the figure, 10 is a surface treatment device, 11 is a pallet, 1
2 is a conveyor device, 13 is a sheet-like non-slip material,
14 is a pressure roller, 15 is a hot air blower, 16 is a feeding guide, 17 is a magazine device, 18 is a movable guide plate, 19 is a protruding rod, 20 is a hot air blower, 21
2 is a preheater, 22 is a pressing part main body, 23 is a support tool, 24 is a guide support main body, 25 is a pivot joint part, 26
is a rotating member, 27 is a threaded rod, 28 is a projection, 29 is a link mechanism, 30 is a phototube, 31 is a stopper,
32a is a protruding part, 32b is a rod part, 33 is a mounting part, 34 is a case, 35 is a spring, 36 is a pivot part, 37 is a spring, 38a and 38b are feed rollers, 39 is a shutter, and 40 is an air cylinder. show.

1 to 3, a pallet surface treatment apparatus according to the present invention for welding a sheet-like anti-slip material to the surface of a pallet is generally designated by the reference numeral 10. This pallet surface treatment device 10 includes a conveyor device 12 that transports the pallets 11 in a fixed direction, a roller 14 that presses the sheet-like non-slip material 13 onto the pallet surface, and a hot air generator that heats the pallet surface and the sheet-like non-slip material 13. A sprayer 15, a feeding guide 16 that supplies the sheet-like non-slip material 13 to the pallet surface, and a large number of sheet-like non-slip materials 13 cut in advance to predetermined lengths are held and the non-slip material 1 is
3.

As shown in FIG. 1, the conveyor device 12 for transporting the pallets 11 in a fixed direction is composed of, for example, a chain conveyor.
The speed of the pallet 11 depends on the size of the pallet 11, the melting temperature, the width and thickness of the sheet-like anti-slip material 13, and the size of the pallet 11.
It is appropriately set in consideration of the difficulty of melting the anti-slip material 13, the hot air temperature of the hot air blower 15, the air volume, etc.

The hot air blower 15 is commonly used and is supported and fixed above the conveyor device 12 by a suitable fixture (not shown). The hot air outlet 20 is arranged on the conveying direction side of the pallet 11 and on the pressing roller 14 side so that both the upper surface of the pallet 11 and the anti-slip material 13, which will be described later, can be heated with hot air near the pressing roller 14, which will be described later. It is supported at an appropriate inclination toward the.

A shutter 39 is provided near the hot air outlet 20 to timely shut off the hot air blown out from the hot air outlet.

As shown in FIG. 4, the shutter 39 is movable by an air cylinder 40 or the like to a position where it blocks the hot air from the hot air outlet 20, and blocks or allows the hot air to pass depending on the timing described later.

Further, a preheater 21 is disposed above the conveyor device 12 in front of the hot air outlet 20 in the conveying direction of the pallet 11. This preheater 21 is used to prevent insufficient heating of the pallet 11 side by the hot air blower 15 which inevitably occurs as the production speed increases (melted layer formation becomes insufficient).
In order to compensate for this, preliminary heating is performed before heating with the hot air blower 15. The installation of such a preheater 21 does not heat the area on the surface of the pallet 11 where the anti-slip material 13 is to be welded in a spot, but in the feeding direction of the pallet, which increases the heating time per unit area. Long, elongated ones are preferred. However, excessive heating that would change the shape of the pallet, which is a synthetic resin molded product, should not be done. Examples of the type of preheater 21 include ordinary preheating means such as an electric heater, hot air, and a gas burner, but a far-infrared heater with good heating efficiency is particularly preferable.

A roller 14 that presses the anti-slip material onto the surface of the pallet with an appropriate force is arranged close to and opposite to the hot air outlet 20 of the hot air blower 15. This pressing roller 14 is rotatably attached to the pressing section main body 22. This pressing part main body 22 is rotatably attached to a support 23 via a rotation member 26, and the support 23 is a guide support main body that supports a feeding guide 16 for supplying an anti-slip material to be described later. It is pivoted to 24. This support 23
The guide support body 24 above the pivoting portion 25 to the guide support body 24 is provided with a support arm extending in the lateral direction, and an opening threaded portion formed at the tip of the support arm is configured to adjust the pressing force. Threaded rod 2
7 are screwed together, and the lower end of the threaded rod 27 is connected to the support 2.
3 is connected to a spring 35 attached to a protrusion 28 provided at 3.

By rotating the threaded rod 27, the strength of the spring 35 can be changed by adjusting the length of the threaded rod 27 by moving it in and out of the open threaded portion of the support arm. Since the support 23 is structured to be pivotable about the pivot portion 25, the pressing force of the pressing roller 14 against the surface of the pallet 11 is adjusted as a result.

However, the pressing force of the pressing roller 14 is adjusted in a minute range by rotating the pressing force adjusting threaded rod 27, and the macroscopic pressing force of the pressing roller 14 is adjusted by raising and lowering the guide support body 24. It is done. This guide support body 2
The vertical movement of 4 is effected by a suitable known link mechanism 29 attached to the back of the support body.

In this way, the surface of the pallet 11 is slightly
The pressing roller 14 is pressed with a constant pressing force even when the pallet is undulating, but the vertical movement of the pressing roller causes the upper surface of the pallet 11 to wave in the same direction as the conveying direction of the conveyor device 12. It is well suited for cases in which it is transferred, but it is difficult to adapt to cases where it is tilted in a direction perpendicular to the direction of transfer.

In order to solve this problem, in the apparatus of the present invention, the pressing part main body 22 is rotatably attached to the support 23 via a rotating member 26 having a bearing etc., so that the surface of the pallet 11 is inclined in a direction perpendicular to the transport direction. In this case, the axis of the pressing roller 14 is inclined so as to follow the inclination of the surface of the pallet 11.

Furthermore, since the pressure roller 14 presses and welds the anti-slip material 13, which is at least partially molten, to the surface of the pallet 11, the non-slip material 13 or the molten material on the surface of the pallet may be deposited on the surface of the pressure roller 14 at this time. For example, the surface of the pressure roller 14 may be coated with polytetrafluoroethylene, polyfluorinated ethylene propylene,
It is preferable to coat the pressure roller with a fluorine-based resin such as polytrifluorochloroethylene, polyvinylidene difluoride, polytetrafluoroethylene, or the like, or to polish the surface of the pressure roller to give it a mirror finish. Furthermore, a scraper may be provided to scrape off any melt that adheres to the pressure roller 14. The scraper may have any structure as long as it can scrape off the molten material adhering to the pressure roller 14.

Note that if the pressure roller 14 is excessively heated during welding of the anti-slip material 13, a cooling air blower or the like may be provided to cool the pressure roller 14.

On the other hand, a feeding guide 16 for feeding the anti-slip material 13 made of a sheet-like synthetic polymer material between the pressure roller 14 and the surface of the pallet 11 is attached to the side surface of the guide support body 24 and is supported. has been done. This feeding guide 16 is provided with a long anti-slip material 13 supplied from a magazine device 17.
The feeding guide serves to feed and arrange the paper between the upper surface of the pallet 11 and the pressing roller 14, and the feeding guide has a generally tubular shape extending in the vertical direction.

The opening at the upper end of the tubular feeding guide 16 is formed into a funnel shape to facilitate introduction of the tip of the elongated anti-slip material 13 supplied from the magazine device 17 into the feeding guide tube. In this way, forming the feeding guide 16 by a tube means that
This is extremely preferable because the traveling path of the anti-slip material 13 is regulated, so that no lateral displacement occurs and the anti-slip material can be accurately positioned on the pallet.

However, the shape, especially the cross-sectional shape, of the feeding guide 16 is not limited to the tubular shape as in the embodiment, but is U-shaped to prevent the non-slip material 13 being fed from shifting in the lateral direction. etc. may be used.

Further, a movable guide plate 18 is provided near the lower end of the feeding guide 16. Movable guide plate 1
8 is pivotally connected to the pressing part main body 22 at a pivot joint 36, and is pulled upwardly by a spring 37.

When the guide support body 24 is pulled upward, the movable guide plate 18 is pressed by a protruding rod 19 provided in a separate part from the guide support body 24, and is pushed against the tension of the spring 37. The anti-slip material 13 is rotated around the pivot portion 36 and removed from the path of the anti-slip material 13 being fed through the feeding guide 16 .

Further, the shutter 39 is positioned in front of the hot air outlet 20 by an air cylinder 40, so that the hot air is prevented from hitting the anti-slip material 13 and the pallet 11 sent out from the feeding guide 16. There is. In this state, the pallet 11 is sent to a predetermined position. That is, the hot air is not applied to the portions of the pallet 11 where the anti-slip material 13 is not provided, but is allowed to pass through. This prevents a decrease in product strength due to thermal history. (Fig. 1) Next, when the guide support body 24 descends, the protruding rod 19 does not move, so the pressure on the movable guide plate 18 is removed, and the movable guide plate 18 is pulled up by the tension of the spring 37, pressing the anti-slip material 13. The anti-slip material 1 is bent toward the roller 14.
3 is positioned below the roller 14.

In this state, the air cylinder 40 is activated, and the shutter 39, which was located in front of the hot air outlet 20 and was blocking the hot air, is moved, and the hot air hits the surface of the pallet 11 and the anti-slip material 13, damaging them. melt. (FIG. 2) Next, as the guide support body 24 descends further, the anti-slip material 13 is pressed and welded to a predetermined position on the pallet 11. (Figure 3) Positioning of the tip of the anti-slip material 13 is important; for example, if the tip of the anti-slip material 13 does not reach directly below the pressure roller 14, the pallet 11
If the tip of the anti-slip material 13 protrudes too far forward from directly below the pressure roller, the pressure of the pressure roller 14 will be applied to the protruding portion. not join,
This will result in poor welding.

By setting the amount of the anti-slip material 13 to be accurate and bending it by the movable guide plate 18, the tip of the anti-slip material 18 can be accurately positioned directly below the pressure roller 14. Especially anti-slip material 13
The required amount of the anti-slip material 13 can be detected by hanging it straight from the feeding guide 16, and it can be accurately positioned by bending it again using the movable guide plate 18. Since the anti-slip material 13 is blocked from being exposed to hot air, the anti-slip material 13 will not melt and contract, thereby preventing the length from becoming incorrect.

A pair of phototube detectors 30a and 30b are attached to the feed guide 16 near its upper end and slightly below the middle, respectively.
These respective phototube detectors 30a or 30b
consists of a light-emitting part and a light-receiving part that are attached opposite to the side wall of the tube of the feeding guide 16, and irradiates the light emitted from the light-emitting part to the light-receiving part through an opening formed in the opposite side wall of the tube. The feeding is detected by blocking the light by the anti-slip material 13 fed inside the pipe.

Furthermore, this feeding guide 16 is provided with a stopper 31 for temporarily stopping the feeding of the anti-slip material 13 fed into the tube of the guide. This stopper 31 includes a protrusion 32a that protrudes into the inside of the feed guide 16 from an opening formed in the side wall thereof, and a rod 32b that supports the protrusion so that it can go in and out from the opening of the feed guide 16. including. Such a stopper 31 is
It can be actuated by any suitable means, such as a linkage actuable by an electromagnetic device or a motor capable of forward and reverse rotation. This stopper 3
1 is actuated, the protrusion 32a crosses into the side wall opening of the feeding guide 16,
By pressing the anti-slip material 13 against the inner wall of the tube, the feeding of the anti-slip material 13 is stopped.

At a suitable location in the horizontal plane slightly above the upper end of the feeding guide 16 is a magazine device 17 that stores a large number of sheet-shaped anti-slip materials 13 cut into predetermined lengths and supplies these sheets one by one in a timely manner. is located.

Next, to explain the operation of the device according to the present invention, the anti-slip material 13 intermittently sent out from the magazine device 17 is sent into the feeding guide 16 by driving the feeding rollers 38a and 38b by the operation of a limit switch or the like. .

When the tip of the anti-slip material 13 reaches the position of the phototube detector 30a, the stopper 31 is actuated by the detection signal to project the protrusion 32a into the tube, and the anti-slip material is applied to the inner wall of the feeding guide 16. Press to pause the feed. At this time, the feed roller 38a stops driving and moves backward to release the grip on the anti-slip material 13.

After the anti-slip material 13 is aligned at a predetermined position, the feed roller 38a and the feed roller 38b are operated again, and at the same time the stopper 31 is released and the anti-slip material 13 is supplied. In this case, the anti-slip material 13 is fed by a predetermined amount by adjusting the distance from the phototube detector 30a to just below the pressure roller 14 to the number of rotations of the feed roller 38a and rotating the feed roller 38a a predetermined amount. Operation of stopper 31, feed rollers 38a, 38
The anti-slip material 13 is stopped by stopping and releasing b.

As described above, the guide support body 24 is raised upward by the link mechanism 29 until the end of the anti-slip material 13 is fed a predetermined distance.

Next, the pallet 11 transferred by the conveyor device 12 is detected and the guide support body 24 is moved.
When the movable guide plate 18 begins to be lowered by the link mechanism 29, the protruding rod 19 pressing the movable guide plate 18 comes off.
The movable guide plate 18 is pivoted by the spring 37, bends the anti-slip member 13, and positions its end directly under the pressure roller 14.

The shutter 39, which had been blocking hot air from the hot air outlet 20 up to this point, is moved by the air cylinder, and the hot air starts melting the surface of the pallet 11 and the surface of the anti-slip material 13.

The guide support body further descends and the anti-slip material 13
The end of the pallet is pressed and welded to the surface of the pallet 11 by the roller 14. Welding can be started from any position along the pallet 11 by adjusting the timing of feeding the pallet 11 and lowering the guide support body 29.

At this time, it is preferable that the descending speed of the guide support body 24 be approximately equal to the transport speed of the pallet in order to obtain a good welding state.

After the ends of the anti-slip material 13 have been welded, the pallets 11 are transported by the conveyor device 12 and welding is performed in sequence.

When the welding progresses and the end of the anti-slip material 13 reaches the phototube detector 30b, the phototube detector 30b detects it and the magazine device 17 starts the next supply.

After the welding is completed, the guide support body 29 rises, and the shutter 39 returns to the position where it blocks hot air from the hot air outlet 20, in preparation for the next welding.

Although the shutter 39 is shown as a roughly J-shaped plate in the drawings, it may have any structure as long as it can effectively block hot air; for example, it may have an opening that covers the hot air outlet and communicates with the side. Various structures are available, such as those with a cylindrical shape that opens to the side in front of the hot air outlet, and those with a switching shutter installed at the connection between this cylindrical part and the hot air outlet. That's good. Further, the air cylinder 40 for operating the shutter 39 is not limited to this, and any mechanism such as a gear mechanism or a link mechanism may be used depending on the case.

As described above, according to the surface treatment apparatus for synthetic resin molded products of the present invention, when welding a sheet-like polymer material from the middle of the synthetic resin molded product, hot air is blocked until the synthetic resin molded product is fed into a predetermined position. Since the parts of the synthetic resin molded product where the sheet-like polymeric material is not welded, that is, the parts that do not need to be heated, are not heated, reducing product strength due to thermal history and weather resistance. It is possible to minimize deterioration, deterioration of surface condition, generation of distortion, etc., and is a very good device in practical terms.

Furthermore, if the means for supplying the sheet-shaped anti-slip material 13 is a magazine device that can accommodate a large number of the anti-slip materials cut into predetermined lengths and can supply them in a timely manner, it is possible to use a feeding guide, a pressing roller, etc. A plurality of anti-slip material welding units each consisting of a hot air welding machine and a preheating device are arranged in parallel to form a non-slip material welding unit group, and a plurality of anti-slip materials are fed from one magazine device to each feeding guide. By feeding the anti-slip materials onto the conveyor device at the same intervals as the feeding guides, a plurality of anti-slip materials can be welded onto the pallet surface at one time.

Furthermore, if the guide support main body 24 is slidably attached as shown in the attachment portion 33 as shown in FIGS. 1 to 3, it is also possible to change the welding position of the anti-slip material.

[Brief explanation of drawings]

Figures 1 to 3 are front views showing the surface treatment apparatus for synthetic resin molded products of the present invention according to the operating order, and Figure 4 shows a part of the shutter part and pressure roller part of the apparatus shown in Figure 1. It is an enlarged perspective view. In the figure, 10 is a surface treatment device, 11 is a pallet, 1
2 is a conveyor device, 13 is a sheet-like non-slip material,
14 is a pressure roller, 15 is a hot air blower, 16 is a feeding guide, 20 is a hot air outlet, and 39 is a shutter.

Claims (1)

[Claims] 1. A surface treatment device for welding a sheet-like synthetic polymer material onto the surface of a synthetic resin molded article, comprising: a conveyor device for transporting the synthetic resin molded article in a fixed direction; a roller that presses against the surface of the molded product; and a hot air outlet that is supported in the vicinity of the pressure roller so as to face the pressure roller in order to heat the surface of the synthetic resin molded product and the sheet-like synthetic polymer material. and a feeding guide for feeding the sheet-like synthetic polymer material between the press roller and the synthetic resin molded product, and a hot air welding machine near the hot air outlet of the hot air welding machine. A surface treatment device for synthetic resin molded products, characterized in that it is provided with a shutter for blocking/passing through.