JPS5826902Y2 - packaging bag - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a packaging bag.

Two pieces of thermoplastic film, a front piece and a back piece, are polymerized and both edges are heat-welded and sealed, and a lid piece extending from the front piece is bent to the back side and releasably adhered to the back piece. Bags are widely used in automatic packaging of clothing, food, and the like.

In this case, the bottom of the bag remains open before packaging, and after inserting clothing and the like, the bag is welded and the excess portion is removed by cutting.

However, in the bag making process, the side edges of the front and back pieces are sealed with the lid piece folded back, so these three
There was a problem in that the pieces were welded together, making it impossible or extremely difficult to open the lid.

As a solution to this problem, it has been proposed to provide thermal sealing means between the edges of both sides of the lid piece and the back piece, but this means is made of printing ink, etc., and has a defect that requires a printing process. was.

Therefore, the present invention provides a packaging bag characterized by providing tear lines near the inner side of both side edges of the lid piece, which can be carved at the same time when the both side edges are sealed by heat welding, and which is pressure-sensitive. The purpose of the present invention is to provide an adhesive that is free from the possibility of damaging the removability of the lid piece due to adhesive or the like.

The above-mentioned separation line may be a perforation, a slit, etc., as long as it can be easily separated when opening the lid, and the angle between the side edge of the lid piece and the separation line may be parallel or at an angle similar to that of an envelope lid, or The opposite angle may be used.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a view of the bag of the present invention from the back side, and its cross-sections along line AA and line B-B are as shown in FIGS. 2 and 3, respectively.

The lid piece 2 extending from the front piece 1 of the thermoplastic film is folded back toward the back piece 3 of the thermoplastic film, and each of these pieces is heat-welded 4, 4 at its side edges, and the lid piece 2 has a Separation lines 5, 5 starting from both side edges and reaching the upper end 2a are carved slightly inward.

In this example, the tear line 5.5 is a perforation through the thickness of the thermoplastic film.

Note that the reference numeral 1a in the figure is an extension of the front piece 1 that extends further downward from the lower end of the back piece 3 to facilitate holding the bag during packaging or inserting items (in the direction of arrow C in Figure 2). Department.

Further, reference numeral 6 is a pressure-sensitive adhesive that releasably adheres the back piece and the lid piece 2.

Next, how to use the above bag will be explained.

The article is inserted as shown by the arrow C in FIG. 2, the front piece 1 and the back piece 3 are heat-welded, for example, as shown by the chain line F in FIG. 1, and the portion below them is removed.

The thus packaged item can be removed from the bag by separating the lid piece 2 along the tear lines 5, 5 and lifting it upward as shown by the chain line G in FIG. 1 and the chain line in FIG. 2 to open the bag.

At this time, the heat welded parts 4, 4 on both sides of the lid piece 2 and the separated parts 5,
Although the triangular portions 2b, 2b surrounded by 5 remain attached to the mounting body, this does not pose any problem.

Of course, even if the front piece is read as a sleeve piece and the back piece is read as a front piece in the above, the structure of the present invention can be interpreted as having the same meaning.

According to the present invention, a lid piece is releasably glued to the opening of the bag, and tear lines are carved on the inside of both side edges of the lid piece, so that thermal sealing means can be printed during the bag making process. This eliminates the need for complicated operations such as opening and closing the lid, and it can also be applied to bags that have been sealed in advance at line F in Figure 1 and items are inserted through the lid during packaging. The practical effects of this invention are enormous.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, and Fig. 1 is a plan view seen from the back side, and Figs. 2 and 3 are A of Fig. 1.
- It is a sectional view about the A line and the BB line. 1...Front piece, 2...Lid piece, 3...
...Back piece, 4... Heat welded part, 5...
...Separation line.

Claims (1)

[Scope of utility model registration request] A cover piece 2 extending from a front piece 1 of a thermoplastic film is releasably adhered to a back piece 3 of a thermoplastic film, and both edges of the front piece and the back piece are heat-welded 4, 4. A packaging bag characterized in that tear lines 5, 5 are carved on the inside near both side edges of the lid piece 2.