JPS5923974B2 - Surface treatment equipment for synthetic resin molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for welding anti-slip materials for synthetic resin molded products.

Specifically, the present invention relates to an apparatus for melt-pressing an anti-slip material made of a sheet-like synthetic polymer material onto the surface of a synthetic resin molded product.
Synthetic resin molded products have very low water absorption, are easy to remove dirt, are hygienic, can be produced in large quantities to a certain standard with stable quality, and have the advantage of not getting hangnails like wooden products. Due to its unique characteristics, it is widely used as boxes, bottles, pallets, etc.

However, these synthetic resin molded products have the major drawback of being extremely slippery, and accidents caused by slipping, such as destruction of the contents of the molded product, have frequently occurred.

For example, as a notable example, synthetic resin pallets may slip between conveyors such as chains and rollers, the forks of forklifts, or the load, making the pallet on the forklift unstable and causing the load to topple over. Ta.

When the cargo was a synthetic resin box, both the pallet and the fork, and the pallet and the cargo, could slip, increasing the risk of an accident. In addition, completely apart from the slippage problem of these synthetic resin molded products, there is a method to bring other synthetic polymer materials into contact with the surface of synthetic resin molded products. A hand-type hot air welder blows hot air onto both welding surfaces of the welding rod, and moves the tip of the hot air welding machine up and down to evenly heat both welding surfaces while welding the welding rod to the synthetic resin molded product. Alternatively, by attaching a guide to a hand-operated hot air welding machine and feeding the workpiece one by one from the guide, welding of both the workpiece and the workpiece, i.e., a synthetic resin molded product, is carried out. A method is known in which the surface is heated with hot air and at the same time the object to be welded is pressed against the end of the guide.

In any of these cases, the key points are: 1) Heat both welding or welding surfaces uniformly. 11) Press the material to be welded or welded uniformly onto the object to be welded.

11! ) The purpose is to move a hand-type hot air welding machine at a constant speed.

Therefore, in order to reliably obtain high welding strength or welding strength, it is necessary to... finely adjust the amplitude and angle of the hot-air welding machine, and adjust the welding rod or guide to the workpiece or adherend. Extreme skill is required, such as applying appropriate pressure to objects and moving the hand-operated hot air welder at a constant speed.

Furthermore, if the materials to be welded or bonded and the materials to be welded are almost the same, it is relatively easy to uniformly heat both. Different materials have different melting temperatures, so
In conventional methods, it is extremely difficult to select the optimal heating conditions for the welding surface.

Also, if the material to be welded or bonded is relatively hard, such as a welding rod, it is easy to generate pressure and therefore the desired welding strength can be easily obtained, but if the material is flexible, Pressure is not applied uniformly, which tends to cause unevenness in welding, etc. Furthermore, it is difficult to carry out such manual work continuously for a long time, and the limit is about 1 to 2 meters at a time.
The present inventors focused on installing an anti-slip material made of a sheet-like synthetic polymer material on the surface of synthetic resin molded products as a measure to solve the major drawback of extremely slippery properties, and furthermore, As a method for installing the anti-slip material, we adopted the conventional method of hot-air welding using a hot-air welding machine, and by solving the problems of the hot-air welding technology, we were able to firmly weld the anti-slip material. The present invention was achieved as a result of various studies aimed at obtaining an apparatus for welding anti-slip materials for synthetic resin molded products that can be easily and accurately welded.

That is, the gist of the present invention is an apparatus for melt-bonding an anti-slip material made of a sheet-like synthetic polymer material onto the surface of a synthetic resin molded product, and a device for heating the synthetic resin-molded product and the sheet-like anti-slip material. A hot air welder, a pressure roller for press-welding the sheet-like non-slip material to the synthetic resin molded product, a feeding guide for supplying the sheet-like non-slip material between the pressure roller and the synthetic resin molded product, and a synthetic resin. The hot air welding machine is provided with a drive mechanism for transferring the molded product in a constant force direction, the hot air welding machine is supported and fixed so that each hot air outlet faces the pressure roller near the pressure roller, and the sender guide is provided with:
The lower end of the feeding guide is located between the hot air outlet and the pressing roller, and the lower end of the feeding guide is curved toward the pressing roller, and the drive mechanism is made of synthetic resin. The drive mechanism is a mechanism for holding the lower part and two opposing sides of the molded product and transporting it in a fixed direction, and one of the mechanisms for holding the two opposing sides of the molded product of the drive mechanism is fixed,
An apparatus for welding a non-slip material for a synthetic resin molded product is characterized by having a mechanism for pressurizing and holding a synthetic resin molded product by applying pressure to a fixed side from an external force.

To explain the present invention in detail, the synthetic resin used for the molded product is not particularly limited, and commercially available synthetic resins such as vinyl chloride resin, styrene resin, polyolefin resin,
Any material such as polyamide resin or polyester resin may be used.

The synthetic resin molded article may be manufactured by any molding method, such as injection molding, extrusion molding, blow molding, rotation molding, vacuum molding, etc.

First, the anti-slip material made of sheet-like synthetic polymer material that is welded to the surface of these synthetic resin molded products is a material that can be welded to the surface of the synthetic resin molded product by heating with hot air and has anti-slip properties. For example, flexible materials selected from low-density polyethylene, ethylene monovinyl acetate copolymer, ethylene-ethyl acrylate copolymer, thermoplastic rubber, etc. may be used.

Therefore, when the anti-slip material is in the form of a long strip, it is suitable for continuous surface treatment of a large number of synthetic resin molded products, that is, anti-slip treatment operations.

}The term "sheet-like" includes a slightly thinner film.

Hereinafter, the present invention will be explained in more detail based on the drawings illustrating the present invention. FIG. 1 is a schematic side view of the surface treatment apparatus of the present invention, FIG. 2 is a schematic front view of only the drive mechanism, and FIG. A side view of the main parts of the processing operation is shown.

Reference numeral 1 designates a chain conveyor 1 for transporting synthetic resin molded products (hereinafter simply referred to as "molded products") in one direction (in the direction of the arrow).

This chain conveyor 1 1 is interlocked with a transmission 2 and a motor 3 in order to transport the molded products at a desired speed. Therefore, the transport speed of the molded product depends on the size of the molded product, the melting temperature, the width and thickness of the non-slip material made of sheet-like synthetic polymer material, the difficulty of melting the molded product and the non-slip material,
Furthermore, it is appropriately set in consideration of the hot air temperature of the hot air welding machine, its capacity, etc. However, the chain conveyor 1 1 may be replaced with, for example, a driving roller or a belt conveyor.

Reference numeral 4 denotes free guide rollers, and a plurality of free guide rollers are arranged in a straight line on one of both sides in the transport direction of the molded product.

Reference numeral 5 designates an endless drive belt provided on the opposite side of the free guide roller 4, which presses one side of the molded product in the direction of the free guide roller 4 by means of a drive free 6 and a constant spring 7. This results in a so-called pressurized endless drive belt.

By providing the free guide rollers 4 and the endless drive belt 5, the molded products being transported on the chain conveyor 11 can be transported while holding both sides of the molded products, thereby preventing molded products from collapsing during transport. This is preferable because it is possible to prevent the occurrence of "meandering" or "slippage" and the subsequent anti-slip treatment operation can be carried out in a constant and continuous manner.

Furthermore, the driving speed of the endless drive belt 5 is set to be the same as the speed of the chain conveyor 11. The above chain conveyor 1, a plurality of free guide rollers 4
} and the endless drive belt 5 constitute a drive mechanism for transporting the molded product in a fixed direction.

Reference numeral 8 denotes a commonly used hot air welding machine, which is supported and fixed above the drive mechanism by a fixture 9, and whose hot air outlet 10 is in the vicinity of a pressing roller 11 (described later) to In order to heat both of the anti-slip materials described below with hot air, they are supported and fixed with an appropriate inclination toward the molded article transport direction side and the pressing roller 11 side described below.

The angle of inclination is therefore a constant angle in the range of 30 to 60 mm, preferably 40 to 50 mm, with respect to the horizontal plane in the direction of the conveying force of the molded article. Reference numeral 11 denotes a pressure roller capable of pressing the upper surface of the molded product with an appropriate force, and this is provided near and opposite to the hot air outlet 10 of the hot air welding machine 8.

Thus, this pressing roller 11 has a support 13a and a support 13 that are movable up and down by a spring 12.
3 is fixed to a support column 15 via a guide 14 that guides it. The pressing strength of the pressing roller 11 is appropriately determined by the width, thickness, etc. of the anti-slip material to be welded to the upper surface of the molded product, and this is adjusted by the strength of the spring 12.

The gap between the pressure roller 11 and the hot air outlet 10 of the hot air welding machine 8 is related to the time from heating to welding, and ultimately affects the welding strength, so it should not be too large and the gap can be adjusted within the range. To ensure this, it is necessary to leave a gap that is not too small.

Although this gap varies depending on the thickness of the anti-slip material to be welded, if the thickness of the anti-slip material is 2 mm, a range of 7 to 25 mm, preferably 10 to 15 ml is appropriate. . However, depending on the surface shape of the molded product, the pressure roller 11 may have a mechanism that allows it to move not only up and down but also to the left and right. This means that the anti-slip material can also be welded. Reference numeral 16 denotes a feeding guide for feeding an anti-slip material made of a sheet-like synthetic polymer material between the pressing roller 11 and the molded product.

The feeding guide 16 serves to feed the long anti-slip material 18 fed from the supply reel 17 between the upper surface of the molded product 19 and the pressing roller 11 .
The shape of the feeding guide 16 is such that the lower end thereof is curved toward the pressure roller, thereby facilitating the feeding of the anti-slip material 18. Further, it is preferable that the lower end thereof has an appropriate curved surface, and that there is a surrounding portion of the anti-slip material 18 approximately in the central portion over an appropriate length. In other words, if the upper and lower ends have curved surfaces, the anti-slip material 1
8 becomes extremely smooth, and if there is an enclosing part approximately in the center, the anti-slip material 18 is introduced while being regulated from the surrounding area, which prevents the anti-slip material 18 from shifting in the lateral direction. etc. can be resolved.

The combination surrounding portion can be easily formed by, for example, making the cross-sectional shape U-shaped or square-shaped. The feed guide 16 having such a shape has its lower end located between the hot air outlet 10 of the hot air welding machine 8 and the pressure roller 11 facing the pressure roller 11, and the lower end and the hot air outlet 10 of the hot air welding machine 8. The pressure roller 11 is guided by a support 13 of the pressure roller 11, and is movably supported by a guide 14 fixed to a support column 15 so that the distance between the two can be changed as appropriate.

Reference numeral 20 denotes a gap adjustment screw for changing the distance between the hot air outlet 10 of the hot air welding machine 8 and the lower end of the feed guide 16.

The gap adjustment screw 20 is arranged so that the tip of the threaded portion thereof faces the surface of the sending guide 16 on the pressing roller 11 side, so that it can come into contact with the sending guide 16.
The support member 13 is provided so as to be able to move forward and backward freely. By adjusting the adjustment screw 20, the distance between the lower end of the feed guide 16 and the hot air outlet 10 of the hot air welding machine 8 can be adjusted very easily. According to the apparatus of the present invention, the surface treatment of the synthetic resin molded product, that is, the welding of the anti-slip material made of a sheet-like synthetic polymer material, can be carried out by hot air welding while the synthetic resin molded product is fixedly supported at a certain position. Since the drive mechanism transports the material toward the machine at a constant speed and in a stable state, the welding surface can be heated evenly, and the hot air heating of the anti-slip material fed from the feed guide to the pressure roller can be adjusted. Also, the adjustment screw for adjusting the opposing distance between the feed guide and the hot air outlet of the hot air welding machine makes it extremely easy to select the optimum conditions.

Furthermore, by providing a plurality of similar hot air welders, pressure rolls, and feeding guides in a single drive mechanism in the apparatus of the present invention, several strips of anti-slip material can be applied to a single synthetic resin molded product at the same time. The present invention has extremely remarkable effects such as continuous welding.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an example of the apparatus of the present invention, FIG. 2 is a schematic front view of only the drive mechanism, and FIG. 3 is a side view of essential parts of the surface treatment operation. In the figure, 1 is a chain conveyor, 4 is a free guide roller, 5 is an endless drive belt, 8 is a hot air welding machine, 10 is a hot air outlet, 11 is a pressure roller, 16 is a feeding guide, 1
Reference numeral 8 indicates a non-slip material, 19 indicates a synthetic resin molded product, and 20 indicates a gap adjustment screw.

Claims (1)

[Scope of Claims] 1. An apparatus for melt-bonding an anti-slip material made of a sheet-like synthetic polymer material onto the surface of a synthetic resin molded product, the apparatus comprising hot air for heating the synthetic resin-molded product and the sheet-like anti-slip material. A welding machine, a pressure roller for press-welding the sheet-like non-slip material to the synthetic resin molded product, a feeding guide for supplying the sheet-like non-slip material between the pressure roller and the synthetic resin molded product, and synthetic resin molding. The hot air welding machine is provided with a drive mechanism for transporting the product in a certain direction, the hot air welding machine is supported and fixed so that the hot air outlet faces the pressing roller near the pressing roller, and the feeding guide has a lower end thereof. It is installed to be located between the hot air outlet and the pressure roller, and the lower end of the feeding guide is curved toward the pressure roller. The mechanism that holds the two opposing sides of the molded product of the drive mechanism is such that one side is fixed and the other side is pressed against the fixed side. A device for welding anti-slip material for synthetic resin molded products, characterized by having a holding mechanism. 2. In the device according to claim 1, a gap adjustment screw is provided close to the feeding guide and can move forward and backward so as to come into contact with the guide from the pressure roll side, and by adjusting the gap adjustment screw, the guide An apparatus for welding anti-slip materials for synthetic resin molded products, which is capable of varying the distance between the lower end of the machine and the hot air outlet. 3. In the device according to claim 1 or 2, the drive mechanism for transporting the synthetic resin molded product in a fixed direction has a straight line on one of both sides with respect to the transport direction of the synthetic resin molded product. An apparatus for welding anti-slip materials for synthetic resin molded products, comprising a plurality of free guide rollers arranged in parallel, and a pressure-type endless drive belt on the other side.