JP4351133B2 - Banding tape - Google Patents

Description

The present invention relates to a wide film-shaped banding tape mainly used for stacking packaging such as catalogs, invoices, books, postcards, cards, and small articles.

JP, 2002-178433, A Conventionally, what laminated polyethylene terephthalate (PET) on the front and back as a banding tape was known as a base. This banding tape composed of a plurality of layers of synthetic resin was wound around an object to be sealed, and then the end portions of the tape were overlapped, and the overlapped portions were thermally welded and bound.

Further, there has been known a band paper in which a paper such as kraft paper as described in JP-A No. 2002-178433 is used as a base, PE is laminated on the surface, and an adhesive layer is further formed thereon.

However, in the banding tape in which PE is laminated on the front and back of PET, there is a problem that the tape is not stretched and soft because there is no PET because the PET is used as the substrate when wound on the object to be sealed. Further, since the multilayer is formed by bonding or coextrusion, there is a problem that the process is complicated and the cost is increased. Furthermore, there are problems that the tensile strength is insufficient when the object to be sealed is a large article, and that the banding tape is weak and difficult to use on a large banding machine.

In addition, in a paper strip having a paper base as described in JP-A-2002-178433, the contents can be visually recognized when used for a printed matter such as a catalog or a book, although it is preferably used for binding banknotes. There was a problem that it was difficult.

Accordingly, the present inventor has provided a banding tape that has a soft feeling and is excellent in tensile strength and compatibility with a banding machine as a result of intensive studies in view of the conventional drawbacks.

This onset Ming bundling tape, a bundling tape consisting of a single synthetic resin layer in the width 20~80mm and thickness 0.08～0.25Mm, the synthetic resin is polypropylene (PP), the PP is The block copolymer PP is 50% or more and the metallocene random copolymer PP is 10% or more, and the synthetic resin layer made of the synthetic resin is uniaxially stretched at a stretch ratio of 3 to 8 times. It is characterized by being easy to manufacture and excellent in tensile strength and compatibility with banding machines.

In this onset Ming bundling tape and may be a synthetic resin layer made of PP is uniaxially stretched stretch ratio 5-7.

Since the banding tape of the present invention is composed of a single synthetic resin layer, it is easy to manufacture and has excellent tensile strength and compatibility with a banding machine. If the synthetic resin is PP, the surface of the object to be sealed is easily visible because of excellent transparency.

Hereinafter, an example of an embodiment of the present invention and an example in which the composition of PP is changed will be described.
As shown in Table 1, banding tapes with different PP blends were produced and evaluated for longitudinal cracking resistance, bending, and irregularities after winding. Moreover, the result of having measured the shrinkage | contraction rate of the bandage tape in each compounding is shown.

Vertical cracking resistance was evaluated by folding it in half in the width direction by hand. The fragile item is likely to cause trouble when used with a banding machine.

Folding is a measurement of the bending of the banding tape in the longitudinal direction, measured after leaving it in a room temperature environment for 24 hours after winding, and measuring the length of the banding tape of 2 m away from the most straight line. The following were marked with o, and those with a diameter of 35 mm or less were marked with x.

When the banding tape is traverse-wrapped, the unevenness after winding has a part where the upper and lower tapes do not overlap at the turn part, and a step can be formed on the edge of the tape by the thickness of the tape. Unevenness occurs due to shrinkage after winding of the wound tape. The presence or absence of this unevenness was visually confirmed and evaluated. The reason for traverse winding the product is that the winding length can be increased.

The shrinkage rate was measured by measuring the shrinkage rate before and after leaving the banding tape in an environment of 60 ° C. for 24 hours.

The surface of the banding tape of the present invention may be a smooth surface, but embossing the front and back surfaces reduces the frictional resistance within the arch of the banding machine, and is more preferable. Further, by embossing the front and back surfaces, the shrinkage after winding is alleviated, and the unevenness after winding is reduced. Further, if embossing is provided only on the front surface or the back surface, curling is eased and the design is excellent.

Claims (2)

A band sealing tape comprising a single synthetic resin layer having a width of 20 to 80 mm and a thickness of 0.08 to 0.25 mm ,
The synthetic resin is polypropylene (PP), and the PP contains 50% or more of a block copolymer PP and 10% or more of a metallocene random copolymer PP,
And the banding tape characterized by the synthetic resin layer which consists of said synthetic resin being uniaxially stretched by 3-8 times of draw ratio . The banding tape according to claim 1, wherein the synthetic resin layer made of PP is uniaxially stretched at a stretch ratio of 5 to 7 times.