JPH01153465A - Wrapping of pipe end - Google Patents

Abstract

PURPOSE:To reduce material costs and decrease hours necessary for wrapping operation by covering the end of pipes from the lower part to the upper over the end to form it in a U-shape by a wrapping material inserted under the pipe for the end and by bonding both upper and lower sides which are confronted with each other by an adhesive. CONSTITUTION:A wrapping material 6 is inserted under a pipe 2 when the pipe has been transferred to the place of packing operation by a conveyor 1 and has stopped there. When the front end of the packing material is detected by a sensor 5, the position of the wrapping material is decided and the packing material 6 is adsorbed by the operation of a sucking catcher 4 due to a signal from the sensor 5. Next, the packing material is folded back to the upward of the pipe 2 end to cover it with holding the rear part of the packing material. Next, the catcher 4 is raised inwardly against the pipe 2 and at the same time, both edges of the rear part of the packing material 6 which is folded back to the upper side of the pipe 2 is lowered to fold double and press both side edges confronted with each other in up and down sides. In this way, the upper and lower side edges are bonded together by a pressure-sensitive adhesive 7.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for wrapping pipe ends for sealing the ends of water pipes, drainage pipes, gas pipes, electric conduit pipes, and other various types of pipes. .

[Conventional technology]

The ends of the pipes mentioned above must be plugged to prevent water and dust from entering the pipes, or from spiders and rats building nests during transportation or storage.

It is not appropriate to put a stopper or cap on the end face of the pipe 1 because it is troublesome and the manufacturing cost of the stopper and cap is high.

Therefore, the end of the pipe is covered with a water-resistant bag, and -i is covered with a water-resistant paper bag.

(Problems to be solved by the invention) The means for covering the end of the pipe with a bag may be
This can also be done when multiple pipes are bundled together, but if the size of the bag is exactly matched to the diameter of the pipe, it will be difficult to cover it, so the bag is made thicker.

Therefore, the bag was folded over the end of the pipe, and the excess edge was folded in and tied with string to prevent the bag from falling out.

Even in pipes where one end of the pipe has a large diameter part for a socket joint, the bag placed over the large diameter part is tied with a string from above at the constriction of the pipe to prevent it from falling out.

In any case, in the conventional method of covering the end of the pipe with a bag to close the end surface, the bag placed over the end of the pipe must be tied with a string, making the packaging work cumbersome.

In addition, packaging costs are high because strings are always required for the bags to be wrapped.

An object of the present invention is to provide a method for wrapping pipe ends that does not require stringing.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a method for wrapping the end of a pipe, in which a packaging material having a pressure-sensitive adhesive layer on both longitudinal edges is used. The front of the packaging material is positioned below the end of the pipe, and at the same time both ffI edges of the front part of the packaging material are caught by catchers, and then Fold the rear part of the packaging material over the end of the pipe while covering the end surface of the pipe, raise the catcher to the height of approximately the center of the pipe, and wrap the front part of the packaging material around the lower half circumference of the pipe. , lower both edges of the rear part of the packaging material that has been folded over the top of the pipe, wrap the rear part of the packaging material around the upper half of the pipe, and lower both edges of the front part and the rear part of the packaging material that corresponds to the top and bottom. Both edges are overlapped and glued together.

[For production]

The effects based on the above means are as follows. The end of the pipe is covered in a cone shape from the bottom to the end and top by the wrapping material supplied to the bottom of the pipe, and the front part of the wrapping material on the top covers the pipe. At the same time that the upper and lower rear portions of the packaging material are wrapped around the lower half circumferential surface of the pipe, the corresponding upper and lower side edges are adhered to each other via a pressure-sensitive adhesive.

That is, the end of the pipe is wrapped by the sheet-like packaging material supplied toward the end of the pipe, as if it had been wrapped in a warm bag, and in close contact with the circumferential surface of the pipe.

〔Example〕

Next, the packaging method of the present invention will be explained step by step with reference to the drawings.

In the figure, 1 is a conveyor, on which a pipe 2 is supported perpendicular to the conveying direction of the conveyor 1. The pipes 2 are positioned at regular intervals, and when the pipes 2 reach the packaging work position, the conveyor 1 is driven intermittently so as to stop while the work is being performed. Although the figure illustrates one large-diameter pipe, the same applies to a pipe bundle made up of a plurality of small-diameter vibrators.

At the packaging work position, there is a packaging tray 3 immediately beside the conveyor 1, a suction cup catcher 4 on both sides of the tray 3, and a packaging device using a photoelectric relay or touch sensor between the tray 3 and the conveyor 1. A material positioning sensor 5 is installed. The catcher 4 is configured to move up and down. The suction cup surface and the packaging material receiver at the lowered position of the catcher 4 are set at substantially the same height as the upper surface of the stand 3.

6 is used as a packaging material, for example, water-resistant paper made by coating one side of kraft paper with polyethylene resin and then pasting reinforcing materials such as thread or synthetic resin tape in all directions.

Although the packaging material 6 in the figure is shown to have been cut to a desired length in advance, it is also possible to cut a long-cut packaging material wound into a roll each time. The width of the packaging material 6 is set to be the sum of the length A, which corresponds to half the circumference of the pipe or pipe bundle to be wrapped, and the length twice the gluing margin width B.

A strong pressure-sensitive adhesive layer 7 is provided in advance at the adhesive margin along both longitudinal edges of one side of the packaging material 6.

First step (see Figures 1 and 2) When the pipe 2 reaches the packaging work position and the conveyor 1 stops, the packaging material 6 is fed toward the end of the pipe 2, and the front part is placed on the receiving stand 3. When the front edge of the packaging material 6 hits the sensor 5, the position of the packaging material 6 is determined, and at the same time, the suction type catcher 4 is activated by the signal emitted by the sensor 5 to remove the packaging material. Adsorb material 6. That is, even if the packaging material 6 is pulled backward in this state, the packaging material 6 does not move.

2nd step (see Figures 2 and 3) Hold the rear part of the packaging material 6 whose front part is positioned and fixed below the end of the pipe 2, raise it as shown in line ia 6a, and then The rear part of the packaging material 6 is folded back over the end of the pipe 2 so as to cover the end surface.

3rd step (see Figure 4) Since both hands are occupied, use the foot switch (not shown).
) etc., the catcher 4 is raised inward toward the pipe 2, and at the same time the pipe 2
Pull down both edges of the rear part of the packaging material 6 which has been folded upward.

Then, the front part 6F of the packaging material 6 is wrapped around the lower layer surface of the pipe 2, and the rear part 6R of the packaging material 6 is wrapped around the upper half circumferential surface of the pipe 2. The edge adhesive layers 7 face each other.

Step 1 (See Figure 1 and Figure 5) The upper and lower opposite edges are overlapped and pressurized to bond them together using anger pressure adhesive.

In this case, the wrapping material 6 closes the end surface of the pipe 2 and at the same time tightly sticks to the entire circumferential surface of the end of the pipe 2. If the side edges 6s of the wrapping material 6 that protrude laterally become an obstruction, the pipe Fold it along the circumference.

Further, a pair of ear-shaped protrusions 6Y formed on the end surface side of the pipe are pushed into the pipe 2 so as to be folded inward.

The width B of the pressure sensitive adhesive layer 7 is set to be slightly wider toward the inside. That is, if the wrapping width for the pipe indicated by reference numeral A in FIG.

As shown in FIG. 6, the method of the present invention can also be carried out in the same manner as described above for packaging a large diameter end 2A for a socket joint in which a seal ring 8 is fitted in advance on the inner periphery of one end of the pipe 2. In that case, the packaging material 6 can be brought into close contact with the different diameter shapes of the ends of the pipe as shown by the chain lines.

〔Effect of the invention〕

The method for wrapping the end of a vibrator according to the present invention involves wrapping the end of a pipe or a pipe bundle to cover the end surface by the above-mentioned process.
Compared to tying the bag with a string from above to prevent it from falling out, using a sheet-like packaging material allows it to be covered as if it were covered with a bag.
Moreover, it can be wrapped tightly and tightly, so there is no need to tie it with string.

In addition, if the pipe end is a large-diameter package, as shown in Figure 6, it can be made to fit tightly by following the shape of the different diameter, so that once it is stuck tightly, it will never fall out even if it is tied with a string. It is effective without any

Therefore, according to the present invention, there is no need to make and prepare a bag for wrapping the end of the pipe. Furthermore, since no strings are required, material costs are low and packaging work time is reduced.

[Brief explanation of the drawing]

1 and 2. FIG. 3 is a perspective view showing each step of the packaging method of the present invention in order, FIG. 4 is a front view, FIG. 5 is a perspective view of the end of the pipe after wrapping, and FIG. The figure is a longitudinal sectional side view showing the packaging state of the large diameter end portion for the socket joint. 1 ... Conveyor 2 Pipe 3 Packaging material receiver is stand 4 ... Catcher 5 - Positioning sensor 6 Packaging material 7 - Pressure sensitive adhesive layer patent applicant: Noriwa Watanabe
Masaru Isono, Patent Attorney
Male Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] (1) Supplying a packaging material having a pressure-sensitive adhesive layer on both longitudinal edges toward the end surface of the pipe with the adhesive layer facing upward;
Position the front part of the wrapping material under the end of the pipe, catch both edges of the front part of the wrapping material with catchers, and then place the rear part of the wrapping material over the end surface of the pipe while Fold it back to the upper side, raise the catcher to the height of the approximate center of the pipe, and wrap the front part of the packaging material around the lower half of the pipe. An end of a pipe characterized by lowering the packaging material, wrapping the rear part of the packaging material around the upper half circumference of the pipe, and superimposing and bonding both sides of the front part and both sides of the rear part of the packaging material corresponding to the top and bottom. packaging method.