Method of forming a cutting auxiliary line

Abstract

A method for drawing a cutting aid line is provided in which a cutting aid line can be drawn on a film regardless of the thickness of the film, the cutting aid line rendering the film cuttable along a given line.  The method for drawing a cutting aid line comprises: sandwiching a film which is either a food-packaging material or a component of the packaging material between a horn to which an ultrasonic wave is propagated and a pedestal; and propagating an ultrasonic wave to the horn, with the film thus sandwiched, thereby melting the film and drawing a groove-shaped cutting aid line on the film.  The pedestal has an end part for sandwiching the film between the end part and the horn, the end part being tapered in at least one direction.  While the film sandwiched between the horn and the pedestal is tensed in the direction perpendicular to the width direction of the end part of the pedestal, an ultrasonic wave is propagated to the horn, thereby drawing on the film a cutting aid line extending in the direction perpendicular to the width direction of the end part of the pedestal.

Description

technical field [0001] The present invention relates to a cutting auxiliary line forming method for forming a cutting auxiliary line for cutting (cutting) the film on a packaging material for packaging food or on a film as a structure of the packaging material. Background technique [0002] Until now, as packaging materials for food such as rice balls, sushi, etc., breads such as sandwiches, sweet breads, and home-cooked bread, and pastries, various types of packaging materials have been provided according to the packaging method. As one of them , the whole or part of the packaging material is made of a resin film. [0003] Such a packaging material is generally formed by providing a line-shaped or strip-shaped cutting auxiliary unit on a film constituting the packaging material, and the film is cut by the cutting auxiliary unit to enable opening. [0004] Here, if the packaging material for packaging rice balls is described, such a packaging material has: an outer film com...

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Problems solved by technology

[0007] However, in any packaging method so far, a cutting tape has been used as the mainstream of the cutting auxiliary unit. However, since the cutting tape is bonded to the film through an adhesive or the like, when the food is heated by a microwave oven, etc., there is a risk of adhesion. Possibility of the adhesive softening and the dicing tape detaching from the film, or the adhesive melting

[0008] In order to solve such a problem, it is proposed to provide a seam line as a cutting auxiliary unit on the film, but the seam line is obtained by continuously (dotted line) setting cuts on the film, so each cut connects the inside and the outside, thereby It is unsatisfactory hygienically. For this reason, when a seam line is used as a cutting auxiliary unit, the blocking film that blocks the seam line (each incision) is pasted on the structural packaging material with an adhesive or heat seal. on the film

Therefore, when the seam line is used as the cutting auxiliary unit of the cutting film, it becomes difficult to open the seal due to the presence of the blocking film. In addition, as in the case of the cutting tape, in the case of heating food such as in a microwave oven, it may be difficult to open the seal. Possibility of the adhesive softening to release the dicing tape from the film, or the adhesive melting

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