Device and method for top seal packaging
AssigneeIshida Co., Ltd.
InventorsToshio Oguri, Norio Kawanishi
Life of this patent
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Abstract
The present invention provides a wrapping device for welding a stretch film to a tray, and particularly a wrapping device that can provide a good appearance after the wrapping, and can suppress disadvantages in a transporting operation. A wrapping device 1 covers a top opening of a tray T with a stretch film Fm, welds the stretch film to the tray T, and thermally cuts it. The wrapping device 1 includes a stretch mechanism 9, a control portion and a film winding portion 53. The stretch mechanism 9 stretches the stretch film Fm. The control portion controls the stretch mechanism 9 to stretch the stretch film Fm at least before welding the stretch film Fm to the tray T. The film winding portion 53 winds up the stretch film Fm after the thermal cutting.
Claims22
A top-seal wrapping device for covering a top opening of a tray containing a wrapping target with a stretch film, welding said stretch film to a peripheral portion of said tray around said opening and thermally cutting said the stretch film, comprising:
- a stretch mechanism for stretching said stretch film;
- a control portion for controlling the stretching of said stretch film by operating said stretch mechanism at least before welding said stretch film to said tray;
- and
- a film winding portion for winding up said stretch film after the thermal cutting.
The top-seal wrapping device according to any one of the preceding claims, wherein
- said stretch mechanism is arranged between a supply position of said stretch film and an end of a position of said welding.
The top-seal wrapping device according to any one of the preceding claims, further comprising:
- detecting means for detecting an opening in said stretch film formed by the thermal cutting, wherein
- said control portion controls said stretch mechanism not to act on at least a portion of said stretch film including and neighboring to the opening detected by said detecting means.
The top-seal wrapping device according to any one of the preceding claims, wherein
- said stretch mechanism has a plurality of film holding portions for holding said stretch film.
The top-seal wrapping device according to any one of the preceding claims, wherein
- said stretch mechanism stretches said stretch film in at least one of the transporting direction of said stretch film or the width direction perpendicular to said transporting direction.
A top-seal wrapping method for covering a top opening of a tray containing a wrapping target with a stretch film, welding said stretch film to a peripheral portion of said tray around said opening and thermally cutting said stretch film, comprising:
- a film supply step for transporting said stretch film to a position above said tray;
- a stretch step for stretching said stretch film in a direction crossing said transporting direction at least before welding said stretch film to said tray;
- and
- a film winding step for winding said stretch film after the thermal cutting.
Dependencies are inferred from the claim text.