JPS5852893B2 - How to pack large items - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method suitable for packing architectural boards such as several layers of plywood, furniture such as bathtubs, multiple pillars, and various other large articles. It is something.

Conventionally, in order to pack such large items, a method has been adopted in which a small or medium sized plastic band made of polypropylene or the like is wrapped around the band and the appropriate tightening is performed using a machine.

However, according to this method, there is not much problem when the item to be packed is made of hard material such as steel, but for other items, when the band is tightened or the band is gripped, the item to be packed may be packed. When lifting an object, the band may bite into the object to be packed, causing damage or damage to the object.

In order to prevent this, as shown in Figure 2, a protective plate or cushioning material is placed on the part of the packaged object C around which the band a is wrapped, or a protective corner b with a wide cross-section of an angular shape or a U-shape is installed. Although it is used, it is not only time-consuming to pack it, but also the amount of materials used increases the packaging cost, and if it is not tightened sufficiently, the band a will come loose if it is carried by gripping it. It was necessary to handle with care as it could cause injury and cuts to the hands.

On the other hand, it is well known that shrinkable films have been widely used as shrink packaging, but in the generally known shrink wrapping, the items to be packed are wrapped in shrinkable film with an appropriate margin, and then For example, the film is heated through a shrink tunnel to shrink the film and tightly wrap the object from all sides.

Accordingly, this packaging method is attracting attention from the point of view of packaging rationalization because even irregularly shaped items can be packaged neatly and easily.

However, when such shrink packaging is applied to large items, although it has the advantage of eliminating the need for auxiliary materials such as protective plates, it requires a large amount of shrinkable film, making it uneconomical and Because of this, it is difficult to hold and lift the whole package, and it is not possible to hold and transport a part as in band packaging, which makes handling and unpacking more inconvenient. .

The present invention uses a strip-shaped shrinkable film with different vertical and horizontal shrinkage rates for packaging such large items, and makes the direction of the high shrinkage rate of the film coincide with the direction of the tightening of the packaged object, thereby achieving the above-mentioned effect. The present invention provides a method for packaging large items that improves various drawbacks of band packaging and film packaging.

Next, the present invention will be explained with reference to the drawings showing one embodiment thereof.

Item A to be packaged has a size of 910rItjTLX1820m
This is made by stacking a plurality of plywood boards 1, and the vicinity of both ends and the center of the object A to be packaged are bound in the width direction with a wide belt-shaped heat-shrinkable film 2.

As the heat-shrinkable film 2, a uniaxially stretchable polyethylene film was used, but by heat treatment of vinyl chloride, polyprolene, vinylidene chloride, polystyrene, polyethylene terephthalate, or nylon, the belt-like film becomes thick (shrinkable) in the length direction. It can be used if it is possible.

Generally, the shrinkable film used for shrink packaging is a biaxially stretched film, and the amount of shrinkage in the vertical and horizontal directions is approximately equal.

The reason for this is that stretched film, which has equal shrinkage rates in the vertical and horizontal directions, not only has good physical properties such as strength and impact resistance, but also shrink packaging is intended to cover the entire surface of the product. This is because films with different shrinkage rates in the vertical and horizontal directions not only have many fine wrinkles and undulations when they are heat-shrinked, which not only makes them look unsightly, but also makes it difficult to print on them. .

On the other hand, when a strip-shaped shrinkable film is used for a large article as in the present invention, the shrinkage in the width direction cannot be controlled if the film has the same amount of shrinkage in the vertical and horizontal directions, so the strip width becomes narrower than a general band. This would produce similar results to unity.

Therefore, the strip-shaped shrinkable film used in the present invention may be a uniaxially stretched film that shrinks only in the length direction and hardly shrinks in the width direction so as to maintain a predetermined width even after shrinking, or a uniaxially stretched film that shrinks only in the length direction and hardly shrinks in the width direction. A biaxially stretched film whose shrinkage is much smaller in the longitudinal direction is suitable.

Further, the shrinkable film used is preferably one that has high elasticity against tensile force in the state after shrinkage, and such a film can be obtained by changing the composition, blending, polymerization method, etc. of the resin.

This elastic belt-shaped shrinkable film is particularly suitable for packaging heavy items.

In other words, when the object to be packed is lifted by gripping the strip of film after packing, the stretch of the film caused by the weight of the object may remain as slack, which loosens the packing and makes retransportation difficult. If the film is elastic, this difficulty can be overcome.

A shrinkable film having similar properties is wrapped around the outer periphery of the object to be packed in such a way that the direction of the film's high shrinkage rate matches the direction of the tightening of the object to be packed. The films are heat-sealed and simultaneously cut at the surrounding edges, and then the object to be packaged is passed through, for example, a shrink tunnel and heated, and the film is shrunk and packaged by this heating.

Note that instead of using a shrink tunnel, the film can also be heated and shrunk by spraying heated gas onto the film.

In this case, the long strip-shaped film may surround the object to be packaged in a single layer, or in two or three layers.

In addition, for such large items, it is recommended to wrap a film around the item to be packed due to its workability, and even when wrapping the item in two or three layers, it is recommended to wrap a ring-shaped film around the item to be packed. This makes the work easier compared to fitting it on.

Furthermore, heat-sealing the edges of the film surrounding the object to be packaged is a necessary step for packaging.

This is because if the surrounding edges are not heat-sealed when the film is shrunk and packed, the edges will be free and cannot be packed even if the film shrinks.

In particular, when surrounding films in multiple layers, the films located inside need to be heat-sealed to each other each time they go around. Therefore, if the films are wrapped too many times, the inner films may not be heat-sealed to each other. The thickness of the film and the number of layers to be wrapped must be determined depending on the packaged item.

Furthermore, in the present invention, two film drawers wound in a roll are stretched vertically with the ends of each film joined, and the objects to be packed are fed into the stretched portion. After surrounding an object with a film, the edges of the surrounding area may be heat-sealed, or the film may be arranged on the left and right sides, packed in the same manner, and heat-sealed.

As described above, the present invention provides a long belt-shaped shrinkable film having different vertical and horizontal shrinkage rates at an appropriate position on the outer circumference of an object to be packaged, which is a large article. This relates to a method for packaging large items, which is characterized by enclosing the packaging film in the same direction, heat-sealing the films together at the edges of the encirclement, and then shrinking the packaging film by heating. Not only can large products with a large planar area or a large cross-sectional area, such as commercial plates or furniture, be easily wrapped with a long strip-shaped film, but also the long strip-shaped film can be wrapped around the outer circumference of the large product. After that, the surrounding edges are heat-sealed and cut at the same time, so regardless of the number of large items such as plywood or the size of the furniture, it can be packed reliably and smoothly, and the packing process is also easy. This can be done continuously, and depending on the weight of the item to be packaged, it is also possible to wrap the film in two or three layers.

In addition, even if the items to be packed are easily deformed or damaged, the strip-shaped shrinkable film will not dig into the items to be packed, eliminating the need for auxiliary materials such as protective plates, and making the items easier to pack. Because the strip-shaped shrinkable film is used only partially for the object, packaging costs can be greatly reduced, and the shrinkable film also shrinks greatly in the length direction, making it strong while maintaining the specified width. It is possible to carry out sufficient packing by closely contacting the object to be packed, and furthermore, the obtained packaged object can be transported by gripping the film portion without injuring one's hand.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an article packed by the method of the present invention;
FIG. 2 is a perspective view of an article packed using a conventional packing method. A: Item to be packaged, 2: Band-shaped shrinkable film.

Claims (1)

[Scope of Claims] 1. A long belt-shaped shrinkable film with different vertical and horizontal shrinkage rates is placed at an appropriate position on the outer periphery of an object to be packaged, which is a large article, and the object is tightened in the direction of the high shrinkage rate of the film. 1. A method for packaging large-sized articles, comprising: enclosing the packaging film in the same direction, heat-sealing the films together at the edges of the enclosing part, and then shrinking the packaging film by heating. 2. The method for packaging large articles according to claim 1, wherein the strip-shaped shrinkable film is a uniaxially stretched film made of vinyl chloride, polyethylene, polypropylene, or other synthetic resin. 3. The method for packing large-sized articles according to claim 1, wherein the strip-shaped shrinkable film is a biaxially stretched film with different stretching ratios in the longitudinal and lateral directions. 4. The method for packing large-sized articles according to claims 1 to 3, wherein the strip-like shrinkable film is a shrinkable film that maintains high elasticity after shrinkage.