JPS587544B2 - Shrink resin film packaging - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to resin film packaging suitable for products such as spools, bobbins, reels, etc., especially steel wires for carbon dioxide arc welding wound around spools, and more specifically, the present invention relates to resin film packaging suitable for products such as steel wires for carbon dioxide arc welding wound around spools, etc. The present invention relates to a hermetically sealed shrink resin package that can be easily opened.

Various methods and mechanisms have been proposed for making packaging using resin films easier to open.

For example, perforations can be made in the packaging film for opening, cutouts can be made in the edge of the packaging film for tearing, or a thin tear tape can be pasted on the back of the packaging film or on the surface of the object to be packaged. Packaging methods have already been put into practice in which a portion of the film is left exposed and the film is torn from that portion by tearing the end.

However, these methods are suitable or unsuitable depending on the size, shape, etc. of the object to be packaged, and are therefore not suitable for packaging welding wire, etc. using Subur.

The present invention provides moisture-proofing, rust-proofing, and
To provide a shrink resin film packaging which is effective in preventing dust, etc., is easy to tear when opened, and has packaging cost as low as possible.

EMBODIMENT OF THE INVENTION Hereinafter, an example in which the present invention is applied to a package of a spool-wound steel wire for carbon dioxide arc welding will be illustrated and explained in detail based on this.

FIG. 1 shows an example of the above-mentioned embodiment in a perspective view, and 3a and 3b which cover between the flanges 2 and 2 of the spool 1 and cover the entire periphery of the spool are heat-shrinkable resin films for packaging.

These packaging resin films 3a and 3b have different thicknesses, and 3
For example, a is a polyethylene film with a thickness of 60 μm, and 3b is a polyethylene film with a thickness of, for example, 80 μm.

Reference numeral 4 in the figure is a seam line where the films 3a and 3b are joined together, and as will be described later, the package is designed to be opened along this seam line.

Symmetrically with the seam line of the films 3a and 3b having different thicknesses, there is a seam line 42 on the opposite side between both flanges, but it is not shown in FIG.

The resin films 3a and 3b, which are spliced into a ring shape and cover the periphery of the spool, shrink after the heat shrinking process, so that both edges of the film come into close contact with both flanges 2, 2 of the spool, and the film between the flanges 2, 2 is pulled due to contraction, becomes taut in the hollow around the spool, and both flanges 2
, 2 (indicated by a broken line 5).
Seal and isolate from moisture, dust, etc.

As mentioned above, the feature of the present invention is that at least two resin films of different thickness are thermally seamed to the covering film so that no pinholes or the like occur, and at least one part of the seam line is
The film is packaged by shrinking the entire film, including the seam part, by heating in a space where the part does not come into close contact with the temporarily packaged object, for example, in FIG. be.

With this configuration, distortion due to the combination of different shrinkage forces due to the difference in thickness of resin films having different thicknesses during shrink processing concentrates on the seam line portion.

Therefore, when attempting to open the film, by intentionally applying an external force to this portion, the film can be torn and opened more easily along the seam line than other film portions.

The thickness of the packaging resin film used should be selected in terms of strength depending on the weight, size, etc. of the packaged object, and the thickness of the films to be spliced does not need to be extremely different; If the difference is too large, there is a risk that the film on the thinner side will tear during shrink processing.

For shrink packaging of the above-mentioned products made of spool-wound steel wire for carbon dioxide gas arc welding, polyethylene films with a thickness of 60μ or 80μ are sufficient for strength, and unless external force is applied to the seams to intentionally open the package. There have been no incidents of accidental tearing due to shock or contact during handling, storage, or transportation.

In the example shown in FIG. 1, two seam lines are provided in the transverse direction between the flanges 2, but the direction of the seam and the type of resin film used can be selected as required.

However, the seam lines 41 and 42 are
, 2, it is effective to avoid unnecessary impact to this part and the risk of tearing due to contact, and if necessary, a tongue piece for opening is provided on the side of the 2 parts of the flange. 11 to further facilitate the opening operation, and as described below, the packaging of the present invention can be carried out efficiently by using a well-known shrink wrapper device as it is without much modification. There are advantages that can be achieved.

FIG. 2 is an explanatory view schematically showing an embodiment of the method of the present invention, in which 6 is a wrapper and 10 is a tunnel furnace for shrink processing.

The wrapper 6 has a pair of packaging film reels 7 and 8, the reel 7 being loaded with a polyethylene film 3a having a thickness of, for example, 60μ, and the film reel 8 being loaded with a polyethylene film 3b having a thickness of, for example, 80μ.

Films 3a and 3 pulled out from both film reels
The tips of b have already been thermally butted and seamed by the sealers 9, 9, forming a seam line 41 and being joined together.

A spool 1 wound with welding wire is placed on a suitable frame (not shown) that moves on a plane G perpendicular to the spliced film surface, so that the film reel is parallel to the plane G. It is placed and fixed so that it moves along arrow A (see A in the same figure).

Next, the spool 1 with the wire wound thereon is attached to both flanges 2.
, 2 front edge side contacts the both edges of the films 3a, 3b and their widths, leaving an appropriate wrapping margin, and as the spool advances, the films 3a, 3b are pulled out from both film reels 7 and 8, respectively, and the periphery of the spool is is coated.

The films 3a and 3b are brought together again at the rear edges of the flanges 2 and 2 of the spool 1 by sealers 9 and 9, and are thermally seamed in a ring shape surrounding the spool 1, forming a seam line there.

The seam line is cut from the center, leaving the seam line on both the side of the film already wound around the spool 1 and the side of the film being pulled out from the film reels 7 and 8; Side seam line is 41
Next comes the spool wrapped with wrapping wire (see the opening in the same figure).

The Subur-wound wire, which has been cut off and covered with a resin film, then enters the tunnel furnace 10 and undergoes shrink processing to complete the packaging (FIG. 3(c)).

The shrink packaging of the present invention can be opened extremely easily.

That is, as shown in FIG. 3A, when the tongue piece 11 at the end of the seam line 4 on the flange surface 2 of the spool is peeled off, the tearing of the film progresses in the direction of arrow B along the seam line. The entire coated film is easily removed from the spool by peeling the film away from the opening in the direction of arrow C.

Note that the tongue piece 11 does not necessarily need to be provided; for example, in the case of packaging as shown in FIG.
By applying a slightly strong external force to a part of the seam line 4 that crosses between the seams, the resin film under tension is torn from that part along the seam line. and then peel off the film.

As mentioned above, the shrink packaging of the present invention can be carried out efficiently at extremely low cost, for example by using existing shrink wrapper equipment, and can be packaged in sealed packages ranging from small to quite large. This shrink resin film packaging can be applied to the previous products by simply selecting the thickness of the packaging film, and has various features of shrink resin film packaging that can be easily opened.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of shrink packaging according to the present invention. FIGS. 2A, 2B and 2C are explanatory diagrams illustrating an example of the packaging method of the present invention. FIGS. 3A and 3C are explanatory diagrams illustrating the method of opening the package of the present invention. 1... Spool, 2... Spunil flange, 3a
... Heat-shrinkable resin film, 3b, 3a and heat-shrinkable resin film with different thicknesses, 4... Seam lines 41, 4,
, 5... Welding wire, 6... Trumpet, I, 8...
・Packaging resin film reel, 9... Latsupar seal bar, 10... Tunnel furnace, 11... Tongue piece, G...
- Spool movement plane.

Claims (1)

[Claims] 1 At least two pieces of heat-shrinkable films of different thicknesses are spliced together so that the seam line appears transversely between the flanges of the spool, bobbin, and reel. Shrink resin film packaging, characterized in that the film portion between the two flanges is tightened by shrink processing to seal the outer peripheral surface and can be opened easily from the seam line.