JPH07291310A - Easily openable packaging bag and its manufacture - Google Patents

Abstract

PURPOSE:To easily close the opening when a take-out work is interrupted by a method wherein a reinforcing film is joined and laminated on the outer layer side in the vicinity of an end part of a base film including an opening, to form a packaging bag from which a content is taken out by cutting the end of the packaging bag. CONSTITUTION:An easily openable packaging bag 1 which is suitable for the packaging of a gel-form or highly viscous food such as fermented soybeans or mayonnaise, etc., is formed of a base film 2 using a multi-layer film wherein a heat-resistant layer 21 is applied for the outermost layer, and a sealant layer 22 is applied for the innermost layer. Then, a reinforcing film 3 is joined and laminated on the outer layer side in the vicinity of the end part of the base film 2, including an opening. When a content is taken out, an opening is formed by cutting the end part of the bag 1 wherein the reinforcing film 3 is joined and laminated, along a cutting line 5. Also, when a take-out work is interrupted, the opening is closed by the elasticity of the reinforcing film 3 in the vicinity of the opening by lightly pinching the opening.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a case where the opening is easily opened when the contents such as natto, mayonnaise, ketchup, gel-like or high-viscosity food such as fresh cream are taken out, and the taking out work is interrupted. The present invention relates to a packaging bag whose opening is closed to prevent the contents from leaking and a method for manufacturing the same.

[0002]

2. Description of the Related Art Gel-like or high-viscosity foods such as natto, mayonnaise, ketchup, and fresh cream are often provided in flexible synthetic resin bags. The contents put in such a flexible synthetic resin bag can be taken out by cutting the end of the bag, forming an opening and squeezing it out, so you can easily keep the contents clean. You can take things out. However, since the opening of such a bag is flexible and lacks elasticity, the opening remains open when the take-out work is interrupted, and the contents adhere to or leak around the take-out port. There was an occasion.

In order to solve such a problem, there has been proposed a synthetic resin bag in which a reinforcing film is adhesively laminated on the inner layer side only near the end of the bag forming the opening. In this case, the elasticity near the opening formed by cutting off the end is high, and the other parts are flexible as in the conventional case, so that the contents can be taken out easily, and if the taking out is interrupted, the opening will be a film. The above problem can be solved because it closes due to its elasticity.

However, since the reinforcing film is adhesively laminated on the inner layer side of the bag, there is a step due to the reinforcing film in the vicinity of the opening, so that the contents tend to stay at this step. was there. Further, due to this retention, stress is easily applied to the adhesive portion, and when the adhesive strength between the base film and the reinforcing film is not sufficient, the reinforcing film is partially peeled off to close the opening,
In some cases, the contents could not be taken out.

[0005]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to provide a packaging bag which does not hinder the taking out of the contents and which can easily close the opening when the taking out work is interrupted, and a manufacturing method thereof. Is to provide.

[0006]

According to the present invention, the packaging bag is formed in such a manner that the end portion of the packaging bag is cut off to form an opening, and the contents are taken out from the opening and used. Provided is an easily openable packaging bag in which a reinforcing film is adhesively laminated on the outer layer side around the end portion including the opening of the base film, and further, the base film is provided with the easy-to-open packaging bag. Apply a heat-sealing agent parallel to the sides, and then overlay a reinforcing film of approximately the same width as the applied heat-sealing agent and heat seal to partially bond the reinforcing film. And a reinforcing film portion of the film are formed so that the reinforcing film portion of the film is on the outer side of the end portion of the packaging bag, the method for producing the easy-open packaging bag is provided. Apply heat sealant After that, the reinforcing film is laminated on the base film so as to be parallel to the side portions of the base film and heat-sealed to form a film in which the reinforcing film is partially adhered and laminated. There is provided a method for producing the easy-open packaging bag, characterized in that the film portion is formed so as to come to the end outer layer side of the packaging bag, and the base film has a heat seal layer as the innermost layer. The heat-sealing agent is a low-temperature type heat-sealing agent that is effective at a temperature lower by 5 ° C. or more than the melting point of the heat-sealing layer. Further provided is a use of the easily openable packaging bag for packaging gelled or highly viscous foods such as natto, mayonnaise, ketchup, and fresh cream.

That is, the packaging bag in which the reinforcing film is adhesively laminated on the outer layer side around the opening has no step inside the bag and the entire bag has flexibility, so that the contents can be taken out very easily. It is also possible that such a packaging bag can be easily and continuously manufactured with a conventional bag-making machine by using a film obtained by heat-sealing a base film and a reinforcing film via a heat-sealing agent. The present invention has been found.

The present invention will be described in detail below with reference to the drawings. FIG. 1 shows an easily openable packaging bag 1 according to an embodiment of the present invention.
The schematic top view and sectional drawing at the time of packing the contents 8 in are shown. Further, FIG. 2 shows a schematic plan view and a cross-sectional view showing a state during (A) taking out the contents 8 from the easily-closed packaging bag 1 shown in FIG. 1 and (B) when the taking-out work is interrupted.

In the base film 2 forming the easily openable packaging bag 1 of the present invention, a reinforcing film 3 is adhesively laminated on the outer layer side around the end including the opening 7. As the base film 2, the heat-resistant layer 21 is the outermost layer and the sealant layer 2 is the innermost layer.
It is preferable that it is a multilayer film having at least two layers having 2 or more from the viewpoint of bag-making properties, and if necessary, an intermediate layer such as a gas barrier layer or an adhesive resin layer between the heat resistant layer 21 and the sealant layer 22. May have. Heat resistant layer 21
Examples of the resin that constitutes the resin include polyethylene terephthalate resin, nylon resin, polypropylene resin, and the like, and as the resin that constitutes the sealant layer 22, a linear low-density polyethylene resin, a low-density polyethylene resin,
Examples include high-density polyethylene resin and ethylene-propylene copolymer. These substrate films 2 can be manufactured by a common method such as a coextrusion molding method using a plurality of extruders, a dry laminating method, or an extrusion laminating method.

The reinforcing film 3 adhesively laminated on the base film 2 is preferably made of a film having high elasticity and high rigidity for the purpose of facilitating opening and closing of the opening 7. As those satisfying such conditions, biaxially stretched polyethylene terephthalate film, polypropylene film, nylon film and the like,
It is preferable to use one having a thickness equal to or larger than that of the base film.

Next, a method of manufacturing the easily openable packaging bag 1 of the present invention will be described. A feature of the present invention is that a reinforcing film is adhesively laminated on the outer layer side of the bag. In the film in which the reinforcing film 3 is partially adhesively laminated on the base film 2 suitable for manufacturing the packaging bag 1, the surface (outermost layer) of the base film 2 is the heat-resistant layer 21 as described above. However, since the reinforcing film 3 is also a film which is difficult to be heat-sealed, it is almost impossible to manufacture it by the usual heat sealing method. Therefore,
In order to produce such a film, it is desirable to apply a heat sealing agent 4 and heat seal.

Taking into consideration that the base film 2 preferably has the sealant layer 22 as the innermost layer as the heat seal agent 4, the sealant layer 22 is melted or deformed during heat fusion. It is preferable to use a low-temperature type one that exerts an effect at a temperature of 5 ° C. or more lower than the melting point of the sealant layer, which is not present. A solution of chlorinated polypropylene or the like is exemplified as the low temperature type heat sealing agent. The heat sealing agent 4 can be applied to either side of the base film 2 or the reinforcing film 3, but it is preferably applied to the side of the base film when productivity is taken into consideration.

Further, it is necessary that the reinforcing film 3 has a tape-like shape and is adhesively laminated so as to be parallel to the side portions of the base film 2. The number and position of the reinforcing films 3 to be adhesively bonded may be appropriately determined according to the convenience of manufacturing the packaging bag 1 of the present invention. For example, in the case of bending one film to make one bag at a time. Can be formed by adhesively laminating reinforcing films 3 on both sides (total of 2 places), and when two films are superposed and supplied, and one bag is made one by one, one side The reinforcing film 3 may be adhesively laminated on the above. Further, when two or more packaging bags 1 are made at the same time, the required number of reinforcing films 3 may be adhesively laminated.

FIG. 3 shows an example of a concrete manufacturing procedure. (1) The heat-sealing agent 4 (chlorinated polypropylene) is applied along both sides while supplying the heat-resistant layer 21 of the base film 2 including the heat-resistant layer 21 and the sealant layer 22 so as to face upward (FIG. 3). (A)). (2) Next, the base film 2 is folded in half so that the sealant layer 22 becomes the innermost layer, and then the reinforcing films 3 are respectively supplied from above and below so as to overlap with the applied heat seal agent 4, and then on top of that. Is heat-sealed at a low temperature of about 80 ° C. to obtain a film in which the reinforcing film 3 is partially adhered and laminated (FIG. 3B). (3) After that, the three sides including the portion where the reinforcing film 3 is adhesively laminated are heat-sealed so as to form a bag shape (FIG. 3C). The seal portion at this time is indicated by. (4) The packaging bag 1 of the present invention is obtained by cutting unnecessary portions at the same time as or after the heat sealing (FIG. 3).
(D)).

The shape of the easily openable packaging bag 1 of the present invention is not particularly limited, but the opening 7 formed by cutting off the end portion takes out the contents 8 having a high viscosity. The smaller the better, while the larger the filling port 6 for filling the contents 8 is. Therefore, the shape shown in FIG. 1 is most preferable.

The method of using the easily openable packaging bag 1 of the present invention will be described below. First, as in the case of an ordinary three-side sealed bag, after filling the content 8 from the filling port 6 which is the unheated sealed portion of the bag 1, the filling port 6 is heat-sealed and sealed to be supplied as a product. To do. Next, the consumer who purchases this product cuts the end portion of the bag 1 on which the reinforcing film 3 is adhesively laminated, along the cut line 5, to form the opening 7. At this time, it is necessary to cut out a part of the reinforcing film 3 so as to remain around the opening 7.
Next, if the contents 8 are squeezed out toward the opening 7, the outlet 7 is opened by the internal pressure, and the contents 8 can be easily taken out. Moreover, the opening 7 can be easily and surely closed by the elasticity of the reinforcing film 3 around the opening 7 by releasing the squeezing force or by slightly pinching the opening 7 in some cases.

[0017]

In the easily openable packaging bag 1 of the present invention, since the elasticity around the opening 7 is enhanced by the reinforcing film 3, the opening 7 can be easily closed, so that the removal work is interrupted. Even if it does, the contents 8 do not leak and the area around the opening 7 is not soiled.

Further, since the reinforcing film 3 is present on the outer layer side of the bag 1 including the opening portion 7, there is a problem that the contents 8 stay or the reinforcing film 3 is peeled off and the contents 8 cannot be taken out. Can be prevented.

Therefore, it is very suitable for packaging gel-like or highly viscous foods such as natto, mayonnaise, ketchup and fresh cream.

[Brief description of drawings]

FIG. 1 shows a schematic plan view and a cross-sectional view of a case in which contents 8 are packed in an easily openable packaging bag 1 which is an example of the present invention.

FIG. 2 shows the contents 8 from the easily closed packaging bag 1 of FIG. 1 (A).
A schematic plan view and a cross-sectional view showing a state when (B) the removal work is interrupted during the removal.

FIG. 3 is an explanatory view showing an example of a method for manufacturing the easily openable packaging bag 1 of the present invention.

[Simple explanation of symbols]

 1 Easy Opening / Closing Bag 2 Base Film 21 Heat Resistant Layer 22 Sealant Layer 3 Reinforcing Film 4 Heat Sealing Agent 5 Cut Line 6 Filling Port 7 Opening 8 Contents Heat Sealing Part

Claims (5)

[Claims] 1. An end portion of a packaging bag is cut off to form an opening,
In a packaging bag for taking out contents from the opening for use, a reinforcing film is adhesively laminated on the outer layer side around the end portion including the opening of the base film forming the packaging bag. Easy opening and closing packaging bag. 2. A base film is coated with a heat-sealing agent in parallel with a side portion of the base film, and then a reinforcing film having a width substantially the same as the width of the heat-sealing agent applied is laminated thereon. The heat-sealing is performed to form a film in which a reinforcing film is partially adhered and laminated, and the bag is formed so that the reinforcing film portion of the film is located on the outer side of the end portion of the packaging bag. Of the easy-opening and closing packaging bag. 3. A reinforcing film is applied with a heat-sealing agent, and then the reinforcing film is heat-sealed on a base film in parallel with the side portions of the base film to heat-seal the film. 2. The method for producing an easily openable packaging bag according to claim 1, wherein the bag is formed as an adhesively laminated film, and the reinforcing film portion of the film is formed so as to come to the end outer layer side of the packaging bag. 4. A low-temperature type heat seal in which the base film has a heat seal layer as the innermost layer, and the heat seal agent is effective at a temperature of 5 ° C. or more lower than the melting point of the heat seal layer. It is an agent, The manufacturing method of the easy opening / closing packaging bag of Claim 2 or 3 characterized by the above-mentioned. 5. Use of the easily openable packaging bag according to claim 1 for packaging gel-like or highly viscous foods such as natto, mayonnaise, ketchup and fresh cream.