JPH02296653A - Envelope with wavy flap - Google Patents

Abstract

PURPOSE:To improve the workability and obtain a sufficient adhesion by using a single sheet of strippable paper in common for at least two envelopes and cutting the edge of envelope flap into a wavy form. CONSTITUTION:Envelopes are overlapped, one above another, with about 1/4 the average width of the flap 2 exposed and such exposed parts of the flaps are coated with an adhesive 3. The adhesive 3 is immediately covered with strippable paper 4 wider than the exposed area of envelopes 1, i.e., a number of the envelopes 1 are attached to a sheet of strippable paper 4 and, when the envelope is used, they are removed one after another starting with the endmost envelope 1a. Since the width (a) of the exposed part of the adhesive coated area 5 is narrow, even if a number of envelopes are attached to a single sheet of the strippable paper, the entire length of the overlapping envelopes can be confined within a moderate range.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bag in which the adhesive-applied portions of the sealing pieces of a large number of bags are protected by a single release sheet, and the tips of the sealing pieces are cut in a wave shape. The present invention is utilized for sealing pieces for sealing paper envelopes and for repeatedly sealing plastic bags.

[Conventional technology]

Conventionally, envelopes are sealed by applying adhesive or pressure-sensitive adhesive to the sealing piece extending from the opening, but in order to make the sealing process easier, adhesive is applied to the sealing piece in advance. There are products in which the adhesive is protected with release paper.

Regarding plastic bags, when it is desired to repeatedly reseal the bags, there are so-called zipper bags, which have male and female thick parts that fit into the bag openings on the front and back sides.

Alternatively, there is also a plastic bag which can be sealed by providing an adhesive and a release sheet on the extending sealing piece of the plastic bag.

[Problem to be solved by the invention]

However, envelopes with adhesive layout require time and effort to coat each envelope with adhesive and cover the adhesive with release paper, resulting in an expensive bag. There was an inconvenience that small release papers were scattered during use. The present applicant stacks two or more bags by shifting them so that the tip of the back side of the sealing piece is exposed, applies adhesive to the collective surface of the exposed part, and applies this adhesive once.
We proposed a method of protecting it with a sheet of release paper. Although this method solves the above problem, when a large number of bags are piled up compactly, the adhesive coating area per bag decreases, and the adhesiveness becomes unstable and there is a risk of peeling off after sealing.

Therefore, there has been a need for a technique that can achieve the same effect as applying adhesive to a wide area even though the area of the sealing piece coated with adhesive is small.

[Problem to be solved by the invention]

The present invention aims to solve the above-mentioned problems, and is configured to provide a bag in which an adhesive is applied to the back side of a sealing piece extending from an opening of the bag, and the adhesive is protected with a release sheet, The bag is characterized in that one release sheet is commonly used in the bag, and the tip of the sealing piece is cut into a wave shape.

The bag according to the present invention is used for a bag having a sealing piece such as an envelope. In addition to envelopes made of paper and plastic,
It is also used for bags with a seal that can be sealed repeatedly.

The tip of the sealing strip needs to be cut in a wavy shape.

Wavy means that the edge line has significant irregularities as shown in FIG. It is preferable that the peaks and valleys have a curved shape, but even if the peaks and valleys have a sharp sawtooth shape, the effect of the present invention can be obtained. In the wavy edge portion, the adhesive scattering width b (the sum of the wave height and the displacement width) is larger than the displacement width a (the width of the actual adhesive application surface) shown in FIG. 2, and b is at least 1 of a. .5 times is preferable.

The actual width of the surface to which the adhesive is applied is a, but since a is meandering, it has the same effect as if the adhesive was applied over a much wider width. That is, when the adhesive is applied to the width a, the upper adhesive portion apparently spreads across the width, and the adhesiveness becomes stable. Further, the wavy cut end portion is difficult to peel off and there is no risk that the attached sealing piece will be peeled off inadvertently.

As the adhesive, all adhesives and pressure-sensitive adhesives that are normally used for reprinting can be used. For bags that cannot be resealed, such as envelopes, a slightly stronger adhesive is preferred.

On the other hand, for bags that are intended to be reopened or resealed, such as plastic film bags with a needle seal, a pressure-sensitive weak adhesive is preferable.

Any release sheet can be used as long as its affinity for the adhesive is greater than its affinity for the bag material.In addition to so-called release paper coated with silicone resin, simple plastic sheets such as polyester, nylon, and polypropylene can also be used. can. This type of release sheet needs to be shared by two or more bags, so the tips of the sealing pieces of multiple bags are stacked with the edges shifted, adhesive is applied to the shifted areas, and then one release sheet is placed on top of the adhesive. It is sufficient to cover them all together with a sheet.

[Effect]

The present invention involves cutting a sealing piece extending from the opening of a bag into a wave shape, stacking a plurality of bags by shifting the bag so that the tip of the back side of the sealing piece is exposed, and applying an adhesive to the wavy cut surface to form a single sheet. The adhesive is protected by a release sheet. As a result, the areas where adhesive is actually applied are as shown in Figure 2.
Although a corresponds to the shift width of each sealing piece, since a meandered, the same effect was obtained as if the adhesive had been applied over a much wider width. That is, when the adhesive is applied to the width a, the upper adhesive portion apparently spreads across the entire width, which, combined with the wavy shape of the cut portion, makes it difficult for the sealing piece to peel off during adhesion.

Furthermore, since many bags are attached to one release sheet, there is no risk of the bags coming apart, and the hassle of attaching a small release paper to each bag can be saved, reducing manufacturing work. Efficiency has improved significantly.

〔Example〕

FIG. 1 is a perspective view of the present invention applied to a envelope. 1 is an envelope, and 2 is a sealing piece, the tip of which was cut into a wave shape. In this example, the sealing pieces were overlapped so that about 1/4 of the average width was exposed, and the adhesive 3 was applied to the exposed area. Immediately, the adhesive 3 was covered using a release sheet 4 that was wider than the exposed area of the envelope 1. As a result, one release sheet (
・A large number of envelopes 1 are now stuck to 4. When using the envelopes, the envelopes 1a may be peeled off sequentially starting from the endmost envelope 1a.

If the seal is sealed, the situation will be as shown in Figure 2, and it will be difficult to separate.

FIG. 3 is an enlarged explanatory view of the adhesive application site on the sealing piece of one bag. 5 is a pressure-sensitive adhesive application site, and the shift width is a. Since the width a is narrow, even if a large number of envelopes are attached to one release sheet, the overall length will remain within an appropriate range. However, since the adhesive is applied in a meandering manner, the adhesive is dispersed over a range equal to the sum of the wave height and the shift width, resulting in stable adhesion and, combined with the wavy shape of the edge line, causing peeling during application. It's difficult.

〔effect〕

The present invention, in which the tip of the bag sealing piece is cut into a wave shape, the adhesive-applied area is shifted and exposed, and the adhesive is applied to this area, and then the release sheet is attached all at once, greatly improves work efficiency. , the supply of adhesive-backed bags has become even easier. Moreover, even if many bags are attached to a single release sheet, the size of the entire bag remains at an appropriate size, and the sealing piece is difficult to peel off and has sufficient adhesive strength.

[Brief explanation of drawings]

Figure 1 is a perspective view of the present invention applied to a paper envelope;
The figure is a plan view of the back side of a sealed envelope, and FIG. 3 is an enlarged explanatory view of the adhesive application site on the sealing piece of one bag. In the drawings, 1 is the envelope, 2 is the sealing piece, 3 is the adhesive, 4 is the release sheet, 5 is the adhesive application area, a is the offset width,
b is the sum of the wave height and the shift width.

Claims (1)

[Claims] A bag in which an adhesive is applied to the back side of a sealing piece extending from an opening of the bag, and the adhesive is protected by a release sheet, and one release sheet is shared by two or more bags, and An adhesive-backed bag characterized by the tip of the sealing piece being cut into a wavy shape.