JPH0481494B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application of the Invention The present invention relates to packaging using a packaging film to which a tear tape is crimped.The present invention relates to packaging using a packaging film to which tear tape is crimped. It can be used for overwrapping products that require a beautiful appearance, such as foods, cigarettes, and cassette tapes. In addition, a wide range of other packaging materials can be used as long as the packaging uses a film with tear tape.

Conventional technology and problems Conventionally, a heat deformable packaging film 1, for example,
Tear tape 2 made of OPP, PET, etc., which is a film such as OPP, KOP, PET, KPET, or cellophane coated with a thermal adhesive such as hot melt or one whose main component is PVC-PVC-acetate copolymer. When heating and crimping the tear tape, the tear tape and the packaging film were simultaneously sandwiched between the heater block 15 and the presser guide 20 as shown in Figure 2, so extra heat was applied to the packaging film near the tear tape, and as a result, the tear tape The packaging film in the vicinity was thermally deformed, and combined with the difference in degree of thermal deformation from the tear tape, wrinkles formed in the form of pleats, detracting from the beauty of the package.

Furthermore, in the conventional technology, since the wrapping film and tear tape are simultaneously held between the heater block and the presser guide and pulled by the film pull-out roller 18, the wrapping film, which has been softened by heating, is temporarily stretched while applying frictional resistance. After cooling, the packaging film shrank, which had a synergistic effect on the occurrence of wrinkles.

Means for Solving the Problems Therefore, the inventor of the present invention developed an innovative method for preventing the packaging film from wrinkling, as shown in FIG. The pressure bonding means (first
In the figure, by pressing the packaging film unwound from the packaging film roll 4 with a pressure roller 6 and a film receiving roller 7), the degree to which the heat for melting the thermal adhesive of the tear tape is transmitted to the packaging film is greatly reduced. , found that the wrinkles in the packaging film were almost completely eliminated,
This invention was perfected through repeated tests.

The crimping means here refers to a means of crimping and adhering a tear tape in which thermal adhesive has been heated and melted to an unheated packaging film. For example, by bringing two rollers 6 and 7 into close contact with each other, A mechanism that smoothly sends out the wrapping film and tear tape while pressing them appropriately as the wrapping film and the tear tape are sandwiched together as the film rotates (Fig. This refers to a method in which a crimping angle α is set using the roller as a fulcrum in the ingress and ejection directions of the film and tear tape. In the method shown in FIG. 3, it is necessary to apply appropriate tension to both materials before and after the fulcrum for crimping, but a known method can be used. In either method, unlike conventional methods, the wrapping film and tear tape are not pulled while applying strong pressing friction to them, and therefore the cause of wrinkles caused by stretching can be largely eliminated.

Effects of the Invention According to the present invention, it is possible to not only obtain the appearance effect of simply preventing the packaging film from wrinkling;
It is possible to reduce the manufacturing cost of packaging films with tear tape. In other words, with conventional methods and devices, the deformation and curling of the packaging film caused a reduction in the operating rate of the packaging machine and material loss, but with the present invention, the operating rate increases, the material loss rate decreases, and the sealing performance is improved. This improves the moisture resistance of the overwrapping package.

Machine used in the examples: An overwrapping machine equipped with a heater that preheats only the tear tape and a pressure roller that does not heat as shown in Figure 1, or a heater block that preheats only the tear tape and a wrapping film that heats the wrapping film as shown in Figure 3. An overwrapping machine with a film receiving roller for crimping tear tape.

Rotation speed: 105 RPM Packaging film: OPP film Tear tape: PET 21μ plus thermal adhesive Heater temperature: 93℃ As a result of continuous packaging tests under the above conditions, no deformation was observed when the tear tape and packaging film were crimped, and the wrapping film did not curl. The operating rate of packaging machines increased by approximately 5%, and the material loss rate decreased by 1%.

[Brief explanation of the drawing]

FIG. 1 is a partial view of an embodiment according to the present invention, FIG. 2 is an embodiment according to a conventional method, and FIG. 3 is a partial view of another embodiment of the present invention. 1...Packaging film, 2...Tear tape, 3
... Tear tape roll, 4 ... Packaging film roll, 5, 15 ... Heater block, 6 ... Pressure roller, 7 ... Film receiving roller, 8,
18... Film drawer roller, 19... Heater block front roller, 20... Presser guide,
α...Film crimping angle.

Claims (1)

[Scope of Claims] 1. In a method in which a packaging film 1 and a tear tape 2 coated with a thermal adhesive are fed out from respective take-up rolls 4 and 3, and are continuously overlapped and pressed together, the tear tape 2 coated with a thermal adhesive is A method for crimping a tear tape onto a packaging film, which comprises heating it with a heater block 5 to melt the thermal adhesive and then crimping it onto the packaging film using a crimping means.