JPS633960Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a pleated pinch bag with a filling opening.

[Conventional technology]

Conventionally, the mouth end of a cylindrical body having one or more layers of pleats made of a rigid material such as kraft paper is cut in a stepped manner to form a flap including a back wall, and the flap is folded along a fold line. Bags that are folded along the front wall of the bag and pasted to close the mouth end are commonly used as so-called pinch bags, and such pinch bags have a filling opening. As, Utility Model Publication No. 1891-1891 or Publication of Utility Model Publication No. 55-27682
A so-called Bates-type filling port, that is, a bag body in which a corner portion of one mouth end is folded into a substantially triangular shape inside a cylindrical body to form a filling port, has been proposed as disclosed in Japanese Patent Publication No. Furthermore, in Japanese Utility Model Publication No. 42-13617, an opening is provided in the trunk part of the pinch bag, a separate cylindrical valve serving as a filling port is inserted into the opening, and both ends of the valve are inserted into the bag and outside the bag. A bag body that protrudes from the top is disclosed.

[Problem that the invention aims to solve]

However, the pleated pinch bag made of a rigid material such as kraft paper and having the Bates type filling port, as typified by a cement bag, does not achieve a high degree of sealing of the filling port after filling the contents. This was considered difficult. In addition to this,
In order to form a Bates-type filling port, it is necessary to combine the bottoming process (usually performed with an automatic bottoming machine called a "pinch bottomer") with an automatic folding machine. The capacity of the automatic folding machine (approximately 45 bags per minute) is significantly lower than that of the pinch/bottomer (over 100 bags per minute). There was a problem in that the capacity of the pinch bottomer was limited by the capacity, reducing productivity and increasing costs.

Furthermore, in bags having an opening in the body lining of the above-mentioned pinch bag, it is difficult to position the body lining near the side edge of the bag body due to bag-making technology, and when trying to fill this type of bag with contents using an existing nozzle-type filling device, the bag will not inflate sufficiently unless the cylindrical valve extends close to the side edge of the bag body. Conversely, if the cylindrical valve is extended, there is a risk that it will break due to the weight of the contents during the filling operation. In addition, this bag has the disadvantage that the cylindrical valve must be inserted through the opening in the body lining during the bag-making process, making it unsuitable for production by automatic machines, so this type of filling port arrangement was considered undesirable in the industry.

The present invention was developed in view of the above-mentioned current situation, and its purpose is to solve the above-mentioned drawbacks, improve the sealing performance of the filling opening, and furthermore provide a bag with a filling opening shaped to allow automatic and highly efficient machine production. It is about providing.

[Means for solving problems]

The bag with a filling opening of the present invention which achieves the above object is made by cutting the mouth end of a cylinder made of a rigid material such as kraft paper and having one or more layers of pleats into a stepped shape, and then forming a back wall. In the bag body, the flap is folded along the bending line onto the front wall of the cylindrical body, and the flap is attached to the front wall of the cylindrical body to close the mouth end. A notch is provided perpendicular to and in contact with the bending line, and the width is equal to the distance between the lower end of the notch and the bending line, and the cut is made from the side edge of the cylinder on the filling port side. It consists of a cylindrical part of the flat body that forms a filling port having a length that reaches the end and reaches a dead end, and tongue pieces on both sides of the cylindrical part, and the tongue piece on the side of the notch is connected to the cylindrical part. A valve body is provided, the tongue on the filling port side is integral with the wall on the inside of the flat body of the cylindrical part, and the cylindrical part and the notch side of the valve body are integral with the wall on the outside of the flat body of the valve body. Attach the tongue piece to the outside of the front wall of the cylindrical body so that the side edge of the cylindrical part matches the notch, and apply hot-melt adhesive to the front wall side of the tongue piece on the filling port side. It is characterized by being coated with.

[Effect]

As shown in the above configuration, the present invention includes a flat tubular part having the above-mentioned specific width and length in the notch provided perpendicularly to the bending line of the flap including the back wall, and a cylindrical part integrally formed therewith. A cylindrical valve is provided by attaching a valve body having a tongue piece to the outside of the front wall of the bag so as to match the valve body, so that the filling port of the cylindrical valve is on the side end of the bag, so that the filling port is The nozzle can be easily inserted, and the sealing performance and strength of the cylindrical valve are improved by bending and pasting the flap. Furthermore, by bending and pasting the tongue on the filling opening side onto the flap after filling, the sealing performance and moisture-proofing properties of the filling opening can be improved.

〔Example〕

Next, one specific example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partial perspective view of the mouth end of the pinch bag with the filling opening of the present invention, showing the state before the valve body is attached;
FIG. 2 is a perspective view of the valve body viewed from the attachment surface, and FIG. 3 is a partial perspective view showing a state in which the valve body is adhered and the mouth end is closed. In the figure, 1 is the cylindrical body, 1' is the front wall of the cylindrical body, 1'' is the back wall, 2 and 2' are the side edges of the cylindrical body, and 3
is a bending line, 4 is a flap, 5 is a notch provided in the front wall 1', 6 is an application area for adhesive for attaching a valve body, 7
is the valve body.

As shown in FIGS. 1 and 2, the valve body 7 consists of a flat cylindrical portion 7' and tongue pieces 7'' on both sides thereof.The tongue piece 7'' on the notch side The tongue piece 7'' on the filling port side is integral with the wall inside the flat body of the cylindrical part, and the tongue piece 7''
Apply hot-melt adhesive to the front wall of the
The width w of the valve body 7 is equal to the distance between the lower end of the notch 5 and the bending line 3, and the length l of the cylindrical part 7' is equal to the distance from the side edge 2 of the cylindrical body on the filling port side. Equal to the length up to part 5. Then, the valve body 7 is placed so that the upper edge of the valve body 7 coincides with the bending line 3 and the side edge of the cylindrical part 7' coincides with the notch 5 at the application part 6 of the valve body sticking adhesive. When attached to the outside of the front wall 1' as shown, the tongue piece 7
The cylindrical valve formed by the cylindrical portion 7' reaches the notch 5 from the side edge 2 of the cylindrical body and becomes a dead end. Therefore, the contents sent out from the packer reach the notch 5 through the filling port,
From there it is filled into bags.

According to the present invention, as shown in FIG. 1, a bending line 3 is attached to the front wall 1' of the mouth end of one of the cylindrical bodies 1 constituting a normal pinch bag, which is cut into a step shape. A notch 5 is provided perpendicularly beyond the notch 5, and then an adhesive is applied to the part 6, and the valve body 7 is pasted thereon. Next, in the same way as closing the mouth end of a normal pinch bag, apply adhesive, for example, hot melt adhesive, to the part closer to the mouth end than the fold line 3, that is, the flap 4, and attach this part to the fold line 3. Fold and paste along the front wall 1' and close as shown in FIG. In addition, the bottom end is cut according to its cutting shape.
For example, if a staircase is cut, it is closed using a pinch method, and if a straight line is cut, it is closed by sewing using a sewing machine.

After filling the contents, as shown in FIG. 3, bend the tongue 7'' of the valve body 7 that protrudes outward from the side edge 2 of the bag toward the front wall, and then attach it to the front of the bag. The filling opening can be sealed by pasting it on top of the flap 4 that is pasted on the wall 1'.
That is, since a heat-melting adhesive is applied to the front wall side of the tongue piece 7'' of the valve body 7, after filling the content, the tongue piece 7'' portion is heated with hot air or the like to melt it. In addition to reactivating the adhesive,
As described above, by bending the tongue piece 7'' onto the flap 4 attached to the front wall 1' of the bag body, the filling port can be easily sealed, and the filling port can be easily sealed. It can prevent moisture from entering.

Since it is sufficient that the upper edge of the valve body 7 coincides with the bending line 3, the notch 5 is provided from the mouth edge of the front wall as shown in FIG. A dimension equal to the width of the w may be provided.

Further, as shown in FIG. 4, after closing the mouth end of the cylinder body 1, an auxiliary piece 8 is pasted on at least the part where the valve body 7 is pasted, so that it can be removed from the bending line 3. The distance to the tip of the flap 4 can be made shorter than the width of the valve body 7. In particular, bend the supplementary piece 8 at line 3.
That is, by pasting it across the mouth edge of the bag after the mouth end is closed, the filling opening portion can be reinforced.

The present invention can be implemented not only as a single-layer bag but also as a multi-layer bag. In the case of a multi-layer bag, as shown in FIG. 5, immediately below the notch 5 of the cylinder 1, over substantially the entire width of the bag on the front wall 1', between each layer constituting the cylinder,
For example, gluing can be carried out using adhesive-applied parts 9 in a horizontal gluing device of a step-up bar to prevent the bag wall from tearing at the score line 5, for example, in the event of an impact during transport.

[Effect of idea]

As is clear from the above structure of the present invention, the filling opening of the bag of the present invention has sealing performance and strength by bending and pasting the tongue piece integrated with the flap and the cylindrical valve body. Are better. Furthermore, when manufacturing the bag body of the present invention, the cut portion can be formed in the same step as step cutting in the bag making process (usually using a step cutting type cylinder making machine called a "step tube"). , and to attach the valve body,
By installing a known cylindrical valve pasting device having a perforation mechanism and a cylindrical forming mechanism, the bottom pasting process can be carried out simultaneously, so the manufacturing method is automatic and can be applied to highly efficient mechanical production. ,
Its practical effects are extremely large.

[Brief explanation of the drawing]

Fig. 1 is a partial perspective view of the mouth end of a pinch bag, which is a specific example of the present invention, before the valve body is attached, Fig. 2 is a perspective view of the valve body, and Fig. 3 1 is a partial perspective view of the mouth end showing the state in which the pinch bag is closed after the valve body is attached to it, and FIG. 4 is a partial perspective view of the pinch bag shown in FIG. Partial perspective view of the end of the mouth showing the attached state, No. 5
The figure is a partial perspective view of the mouth end of the multilayer pinch bag of the present invention, showing a state in which the layers are bonded together. In the figure, 1...Cylinder body, 1'...Front wall, 1''...Back wall, 2, 2'...Side edge of cylinder body, 3...Bending line, 4...Flap, 5... ...Notch part, 6...Application part of adhesive for attaching the valve body, 7...Valve body, 7'...Cylindrical part of the valve body, 7'', 7...Tang piece of the valve body, 8...
Supplementary piece, 9...The part where adhesive was applied.

Claims (1)

[Scope of utility model registration request] A flap including a back wall is formed by cutting the mouth end of a cylinder having one or more layers of pleats made of a rigid material such as kraft paper in a stepped manner, and the flap is aligned along the bending line. In a bag whose mouth end is closed by folding and pasting it onto the front wall of the cylinder, a cut is made perpendicular to the bending line and in contact with the front wall of the mouth end. It has a width equal to the distance between the lower end of the notch and the bending line, and a length that reaches the notch from the side edge of the cylinder on the filling port side and reaches a dead end. It consists of a cylindrical part of the flat body forming the filling port and tongue pieces on both sides of the cylindrical part, and the tongue piece on the notch side is integral with the wall on the outside of the flat body of the cylindrical part, and the filling port is The side tongue piece is provided with a valve body that is integral with the inner wall of the flat body of the cylindrical part, and the side end of the cylindrical part is connected to the tongue piece on the side of the cylindrical part and the notch part. 1. A bag having a filling opening, characterized in that the tongue piece is attached to the outside of the front wall of the cylindrical body so as to match the filling opening, and a hot-melt adhesive is applied to the front wall side of the tongue piece on one filling opening side.