JPH06219406A - Packing method with prestretched band - Google Patents

Abstract

PURPOSE:To make packing possible with less amount of band and to prevent loosening of the band while preventing collapsing of packed articles by a method wherein a plastic band is prestretched beyond its yield point and the stretched plastic band is wound round a number of articles to be packed on a pallet and the packing is made with the articles packed as a unit. CONSTITUTION:A plastic band 12, wound round a band reel 11, is stretched beyond its yield point when it is made to pass through rollers 14 and 16 that are different in revolution speed. An idler 20 is interposed in a position between the roller 14 and the roller 16, and a bigger frictional resistance is produced therewith on the upstream side of the roller 16. The roller 16 rotates, resisting against the said frictional resistance, at the speed higher than that of the roller 14, and thereby the plastic band can be stretched beyond its yield point. The stretched plastic band 12 is sent from the roller 16 to a pair of guide rollers 22 for feeding into a packing machine 1 through feed rollers 24 and is wound round a number of articles 28 to be packed on a pallet 26. Thereby loosening can be prevented from occurring to the plastic band 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pre-stretch band wrapping method for wrapping a stretched plastic band on a pallet to wrap it.

[0002]

2. Description of the Related Art A large number of packing items such as danboles, aluminum cans, tires, etc. are stacked on a pallet, and stretch films (films) are partially overlapped and spirally laid over each other to make a large number of packing items on the pallet. The so-called pallet stretch film packaging, which is packaged as a unit, is rapidly spreading.

According to this pallet stretch film packaging, the collapse of the packaged goods during the cargo handling work can be prevented.

Usually, a pallet loaded with packages is placed on a turntable, and while pulling the film out of the original film, the turntable is rotated and the film is placed on the turntable. The packaged items are packed and wrapped around the packaged items.

The film is stretched in advance before packaging, and the stretched film is attached and wrapped around a package.

In the known method, the turntable is rotated while applying a break to the original film, and the film is pulled out and stretched under the tensile force (stretching force) generated in the turntable. ing. However, in this method, the film is stretched between the original film and the package, and the widthwise reduction (neckdown) occurs at the stretched portion of the film.

The neck-down reduces the packaging area of the film, and the film cannot be sufficiently stretched due to the neck-down. Also, since the film is closely attached to and wrapped around the package while stretching, the corner of the package is
A large binding force acts on the (corner) to deform or damage the corner, or the film is easily cut due to an acute contact with the corner.

Therefore, a so-called pre-stretch film packaging method has been proposed in which the stretching, the adhesion and the winding of the film are separated. In this method, the film is pre-stretched beyond the yield point and the stretched film is sent from the roller to the package by utilizing the difference in rotation speed between the two rollers adjacent to the original film. It is tightly attached and wrapped around.

According to this method, since the film can be stretched by a factor of 2 or more as compared with the conventional stretching, the consumption of the film is reduced and the cost can be reduced. In addition, neck down does not occur even at a high elongation rate (stretch rate). Further, since the film is oriented due to the large stretching to increase the film strength, it is possible to prevent the corner of the package from being damaged and the film from being cut even though a strong binding force can be secured.

[0010]

However, in the film packaging, the film is adhered and laid over the entire side surface of the package while partially overlapping the film. Therefore, even in the pre-stretch film packaging in which the amount of the film used is relatively small, several times as many films as the total side area (total exposed area) of one package are required.

Then, a large amount of film becomes unnecessary after use. Since the film is made of plastic polymer,
Even if you bury it in the soil, you can not expect to destroy the nature and return to the soil,
The film is incinerated. However, if incinerated,
A bad smell is generated and the environment is destroyed, and the incinerator is easily damaged. Furthermore, the incinerated powder is not disposed of easily, and incineration is not easy.

It is an object of the present invention to provide a pre-stretch band packaging method which is easier to dispose of than a conventional one.

[0013]

In order to achieve this object, the present invention pays attention to a plastic band such as a polypropylene band used in a packing machine (band hanging machine), and instead of a stretch film, the plastic band is used. Are using.

The plastic band is pre-stretched beyond the yield point by utilizing the difference in rotation speed of a pair of rollers adjacent to the band reel, and the stretched plastic band is sent to a packing machine, It is tightly wrapped around the package.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, according to the pre-stretch band packing method of the present invention, a pair of plastic bands 12 such as a polypropylene band (PP band) and a polyester band wound around a band reel 11 are provided. Roller 1
It is stretched in advance between 4 and 16 and then sent to a packing machine (banding machine) 18 for banding.

The pair of rollers 14 and 16 have different rotational speeds,
The rotational speed of the downstream roller 16 is set to be three times the rotational speed of the upstream roller 14, for example. In the embodiment, the rollers 14 and 16 have the same diameter, and when the downstream roller 16 makes three revolutions, the upstream roller 14 makes one revolution while applying a brake.

As described above, by changing the rotational speeds of the upper and lower rollers 14 and 16, the plastic band 12
Is stretched beyond its yield point as it passes between rollers 14 and 16.

It is preferable that a large frictional resistance against the pulling due to the rotation of the downstream roller 16 is generated in the upstream roller 14, for example, the upstream roller 14 is made of a hard urethane resin having a large frictional resistance. It is molded into a shape with multiple protrusions. On the other hand, the roller 16 on the downstream side is formed of metal into a smooth surface shape, and has a low frictional resistance.

In the embodiment, an idler having a large frictional resistance is used.
20 is provided between the pair of rollers 14 and 16, and the idler 20
Like, for example, the roller 14, is molded from a hard urethane resin into a shape with multiple projections and is non-rotatable.

As described above, not only the upstream roller 14,
A large frictional resistance is provided downstream of the idler 20.
In the configuration in which the roller 16 downstream is rotated at a higher speed than the roller 14 upstream, the plastic band 12 is easily stretched until the yield point is exceeded. it can.

The plastic band 12 stretched beyond the yield point is sent from the roller 16 to a pair of guide rollers 22 and is fed to a packing machine 18 via a feeder roller 24 and placed on a pallet 26. It is hung on many packages 28.

Although the packing machine 18 is not an essential part of the present invention, it will not be described in detail, but basically, a known packing machine with an arch can be used. Plastic band 12 is the packing machine's arch 18
It travels in a and passes around the package 28 passing between the upper and lower deck boards of the pallet 26.

Then, when the flap of the arch 18a is opened, the plastic band 12 drops and is tightly attached to the packaged article 28 and the pallet 26. Then, when the plastic band 12 is cut and welded, the package 28 is packed in the vertical plane integrally with the pallet 26 by the plastic band.

In the present invention, the plastic band 12 is pre-stretched and a large tensile force is exerted on the plastic band, so that the flap of the arch 18a remains in its closed position against this tensile force. The arch flaps have a strong structure.

The pre-stretched plastic band 12 is
After packing, it shrinks a certain amount and firmly adheres to the packaged item, so the plastic band is securely prevented from loosening.

In the embodiment, the package 28 and the pallet 26 are integrally packaged. But turntable palette
The package 28 may be placed on 26, and the plastic band 12 may be hung on the package while rotating the turntable to package the packages together.

Further, in the embodiment, the packages are packed on the vertical surface, but the packages can be integrally packed on the horizontal surface.

The above-mentioned embodiments are intended to explain the present invention, and do not limit the present invention at all, and all modifications and alterations made within the technical scope of the present invention are also included in the present invention. It goes without saying that it will be done.

[0030]

As described above, according to the pre-stretch band packaging method of the present invention, in comparison with the amount of film required in the known pre-stretch film packaging method,
The same packaging can be made with a much smaller amount of bands. Therefore, the amount of unnecessary bands after use is small,
Disposal is easier than before.

Since the consumption of the plastic band is small, the cost can be reduced.

Compared with a film, a plastic band is less likely to cause neck down and can be reliably stretched.

The plastic band is far superior in strength to the film, and even if it comes into contact with an acute-angled corner, the plastic band is less likely to be cut, and the package can be packed tightly.

The yield point of the plastic band is much higher than that of the film, and a strong binding force is obtained within the range where the corner is not deformed or damaged, and the collapse of the load can be surely prevented.

Since the pre-stretched plastic band is packed and then contracted by a certain amount to firmly adhere to the packaged product, the plastic band is securely prevented from loosening.

[Brief description of drawings]

FIG. 1 is a schematic view of an apparatus for carrying out the pre-stretch band packing method of the present invention.

[Explanation of symbols]

 11 Band reel 12 Plastic band 14, 16 Roller 18 Packing machine 20 Idler 22 Guide roller 24 Feeder roller 26 Pallet 28 Packed items

Claims (2)

[Claims] 1. A plastic band is stretched in advance until it exceeds a yield point, and in a process separated from the stretching process, the stretched plastic band is hung on a large number of packages on a pallet to integrally package the packages. Pre-stretch band packaging method. 2. A plastic band is pre-stretched until it exceeds the yield point, and in a process separated from the stretching process, the stretched plastic band is hung on a large number of packages on a pallet in a horizontal plane to package the packages together. In addition to the pallet, wrap the plastic band even in the vertical plane, including the pallet,
A pre-stretch band wrapping method that packs the packaged items together.