JP-7856298-B2 - Shrink wrapping machine

JP7856298B2JP 7856298 B2JP7856298 B2JP 7856298B2JP-7856298-B2

Inventors

西田博之
宮崎敦郎

Assignees

株式会社フォーネット社

Dates

Publication Date: 20260511
Application Date: 20220525

Claims (3)

A shrink packaging apparatus comprising: an article supply unit for supplying articles having a hexahedral shape; a film supply unit for supplying heat-shrinkable shrink film; an article storage unit for storing the articles in a storage unit made of shrink film to form an article storage bag before heat shrinking; and a heating unit for shrink-packaging the stored articles by heating the formed article storage bag to heat-shrink the shrink film, wherein The film supply unit is equipped with a perforation forming device for forming perforations along the supply direction of the shrink film, thereby providing an easy-tear line on one side of the hexahedral shrink-packaged article after shrink packaging. The perforation forming device includes a disc-shaped round knife equipped with a plurality of protruding cutter blades arranged at intervals in the circumferential direction, wherein the plurality of protruding cutter blades are arranged in a continuous manner only in a portion of the circumferential direction on a hypothetical straight line traversing one surface of the shrink-wrapped article, and the plurality of unit perforations constituting the perforation are formed in a continuous manner at intervals of 1.0 to 7.0 mm, with a length of 0.5 to 1.5 mm, at 5 to 22 locations . The round knife of the perforation forming apparatus is configured to form the perforations with a plurality of protruding cutter blades while rotating, with the shrink film sandwiched between it and a rotating roller around which the shrink film is wound. The perforation forming apparatus is a shrink packaging apparatus that includes a reciprocating mechanism for moving the round knife forward and backward relative to the rotating roller .
The shrink wrapping apparatus according to claim 1, wherein multiple protruding cutter blades are arranged in a continuous manner only on a portion of the circumferential direction, so that multiple unit perforations constituting the perforations are formed in a continuous manner at 6 to 15 locations with a length of 0.5 to 1.0 mm and at intervals of 3.0 to 6.5 mm.
The shrink-wrapping apparatus according to claim 1 or 2, wherein the article having the hexahedral shape is a booklet formed by laminating multiple printed sheets having a rectangular planar shape to a predetermined thickness.

Description

This invention relates to a shrink-wrapping apparatus for shrink-wrapping articles having a hexahedral shape, such as booklets, using heat-shrinkable shrink film. Conventionally, shrink packaging using shrink film, a heat-shrinkable synthetic resin film, has been known as a method for packaging various items, such as instant noodles. Shrink packaging involves forming a tubular shape from shrink film with pinholes on its surface, placing the item inside the formed tubular shrink film, and sealing both ends. The resulting item-containing bag is then heated by passing it through a heating element, causing the shrink film to shrink and allowing the item to be packaged in a tightly sealed state. Various packaging devices for implementing this type of shrink packaging have been developed (see, for example, Patent Document 1). The shrink packaging apparatus described in Patent Document 1 includes an article supply unit for supplying articles, a film supply unit for supplying shrink film, an article storage unit for placing articles in shrink film bags to form article storage bags, and a heating unit for heating the formed article storage bags. When the article storage bags pass through the heating unit, the shrink film is heated. Through the synergistic effect of the shrink film's contraction and the subsequent expansion of air inside the article storage bags before being expelled through pinholes, a shrink-packaged article is obtained in which the shrink film is tightly pressed against the surface of the article. Japanese Patent Publication No. 2007-99356 This is a schematic side view illustrating the configuration of a shrink packaging apparatus according to a preferred embodiment of the present invention.This is an enlarged view of section A in Figure 1, illustrating the process of forming perforations in shrink film using a perforation forming device.(a) is a front view illustrating a round knife, and (b) is a cross-sectional view of (a) taken along line B-B.(a) is a schematic perspective view illustrating a shrink-film packaged article formed by a shrink-wrapping device, and (b) is a front view of the shrink-film packaged article.This is an enlarged schematic side view illustrating the first heating tunnel that constitutes the heating section.This is an enlarged schematic side view illustrating the second heating tunnel that constitutes the heating section.This is an enlarged schematic side view illustrating the goods supply section. The shrink-wrapping apparatus 10 shown in Figure 1, according to a preferred embodiment of the present invention, is used to form a hexahedral shrink-film-packaged article 50 (see Figure 4) by covering a booklet 50', which is formed by laminating multiple printed sheets of paper having a rectangular planar shape to a predetermined thickness, with a shrink-wrapping film 20. The shrink-wrapping apparatus 10 of this embodiment easily forms perforations 52, which serve as easy-tear lines 54, on the shrink-wrapping film 20 covering, for example, one side of the hexahedral shrink-film-packaged article 50 (booklet 50'), in a manner that prevents tearing during heating, while also making it easy to tear when removing the booklet 50'. This ensures that the resulting shrink-film-packaged article 50 (booklet 50') is distributed and sold in a stable packaging form, and allows for smooth removal of the booklet 50' during use. Furthermore, the shrink packaging apparatus 10 of this embodiment comprises an article supply unit 11 that supplies a booklet 50' before packaging, which is an article having a hexahedral shape; a film supply unit 12 that supplies a heat-shrinkable shrink film 20; an article storage unit 13 that houses the booklet 50' in a storage unit made of shrink film 20 to form an article storage bag 51 before heat shrinking; and a heating unit 14 that heats the formed article storage bag 51 to heat shrink the shrink film 20, thereby shrink-packaging the housed booklet 50' to form a shrink-film-packaged article 50. The film supply unit 12 is equipped with a perforation forming device 15 for forming perforations 52 (see Figure 4) along the supply direction of the shrink film 20, thereby providing an easy-tear line 54 on one side of the hexahedral-shaped shrink-packaged article 50 after shrink packaging. As shown in Figures 2 and 3(a) and (b), the perforation forming device 15 includes a disc-shaped round knife 16 equipped with multiple protruding cutter blades 16a arranged at intervals in the circumferential direction. The round knife 16 has multiple protruding cutter blades 16a arranged in a continuous manner only in a portion of a hypothetical straight line 53 (see Figure 4) crossing one surface of the shrink-wrapped article 50. These perforations 52a are formed in a continuous manner at intervals S of 1.0 to 7.0 mm and with a length L of 0.5 to 1.5 mm, at 5 to 22 locations. (See Figure 3(a)) Furthermore, in this embodiment, the circular knife 16 of the perforation forming device 1