JPS60110645A - Manufacture of bag with blowing port valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a bag with an inlet valve, and more specifically, the present invention relates to a method for manufacturing a bag with an inlet valve, and more specifically, a bag with a V-shaped cross section on both sides and a bag with a gusset that is folded inward between the mouth and the sides. The present invention relates to a method of manufacturing a bag with an inlet valve.

Conventionally, such a bag with an inlet valve has been manufactured, for example, by the Utility Model Industry Co., Ltd.
Publication No. 20596, Publication No. 11871 of Utility Model Publication No. 11871, Publication No. 21887 of Utility Model Publication No. 57-21887 or Publication No. 428 of Utility Model Publication No. 57-428
This is well known as disclosed in Publication No. 27 and the like. However, these conventional bags with an inlet valve are constructed by sandwiching the edges of both the mouth and the bottom with reinforcing sheets, as shown in the above-mentioned Utility Model Publication No. 57-11871 (a representative example thereof). The bag was sealed by sewing with a sewing machine, and the method of sealing the mouth and bottom of this type of bag has basically remained unchanged to this day.

However, with conventional bags with inlet valves, the sealing of the mouth and bottom is done using a 4" sewing machine, which limits the manufacturing speed to the sewing machine speed, making it difficult to achieve high speed. Furthermore, the strength of the sealing part is also low. In particular, due to recent thinning, the problem has arisen that the desired strength is not achieved when the number of layers is reduced to about two.

This occurs when strong pressure is applied to the contents filled in one throat due to falling during stacking or handling, and as a result, the bag may tear from the seam at the mouth or bottom. It is easy to cause rupture, so the method of pasting the bottom in the usual shape is being adopted. However, the method of pasting the bottom in a normal shape requires changing the bottom pasting machine depending on the size, and is not as easy as using a sewing machine. As one means for this purpose, a method has been proposed in which a reinforcing sheet placed at the mouth and bottom of the bag is bent together with the edge of the bag and fixed with adhesive over the entire surface. Indeed, it has been proven that this method shortens the sealing time and significantly improves the strength.

However, this was not a method that could also solve the problem of bag reuse, which has become a hot topic in recent years in relation to resource conservation.

Therefore, an object of the present invention is to speed up the sealing work of the mouth and bottom of a bag with an inlet valve, thereby improving its productivity, increasing the strength of these parts, and furthermore, improving the sealing process of the bag after opening. It is an object of the present invention to provide a method for manufacturing a bag with an inlet valve that can be reused.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of manufacturing a bag with an inlet valve according to the present invention will be explained in more detail below based on preferred embodiments shown in the accompanying drawings.

As shown in FIG.
1 is cut to form a protrusion 12 having a width including a gusset at the upper part of one side, and has a cylindrical shape as shown by reference numeral 13 at a predetermined distance from the cut point 1g. The sheet is cut linearly across the sheet to sequentially form a cylinder 14 for each individual bag as shown in FIG. 1(b).

Next, in this cylindrical body 14, as shown in FIG.
5, the proximal end P of the protrusion 12 on the center side in the width direction of the cylinder body
While forming a folding line 15 at 45° with respect to the side edge, the protrusion 12 is unfolded into a substantially trapezoidal shape as shown in FIG. This is folded inward to form the inlet valve 16. As a result, a cylindrical body 14 having an inlet valve 16 at the upper part of one side is formed as shown in FIG. 4.

In such a cylinder 14, an upper edge, that is, a mouth end edge 17a, on which the inlet valve 16 is formed, and a lower edge, that is, a bottom end edge 17b.
As shown in FIG. 4, reinforcing sheets 18a and 18b having approximately the same length as the width of the cylindrical body are affixed to each of the reinforcing sheets 18a and 18b with a portion thereof protruding outward from each edge 17a and 17b. .

By the way, these reinforcing sheets 18a and 18b are each obtained from a long sheet wound into a roll, and the width thereof is such that it covers the end surface of the bag which becomes square when the bag is filled with contents. It is. A thermoplastic adhesive 19 is applied to the elongated sheet for one of the reinforcing sheets 18a at predetermined intervals during supply, and the sheet is cooled. The adhesive 19 is applied to the reinforcing sheet 18a at the opening edge 17a as described above.
K arrangement and the part corresponding to the death inlet, that is, Fig.
) As shown in FIG.
The vocal range is defined as the point where the line and the edge of the mouth almost intersect. The adhesive 19 is applied at predetermined intervals and fed while being cooled, and as described above, the long sheets are sequentially cut to have a length t that is approximately the same as the width of the cylinder 14, and the reinforcing sheet 18a is manufactured. be done.

As shown in FIG. 5(b), the reinforcing sheet 18b attached to the bottom edge 17b of the cylindrical body 14 is placed in the central region in the same flow direction when the long sheet is fed. The opening ya, 22 are placed and pasted continuously.

Then, the long sheets are sequentially cut to have a length t that is approximately the same as the width of the cylindrical body 14, thereby manufacturing the reinforcing sheet 18b.

Each reinforcing seam) 18a thus manufactured.

18b as described above, each edge 1.7a of the cylinder 14
.

17b.

Thereafter, the mouth end edge 17a and the bottom end edge 17b of this cylinder 14, along with the respective reinforcing sheets 18a and 18b, are partially aligned with the folding lines 23a and 23b in FIG.
The light is reflected around the center. As shown in FIG. 6, each reinforcing seam), 18a.

The portion 18b protruding from the end edge of the cylinder is adhered to the bent side surface of the cylinder 14, thereby completing a bag with an inlet valve in which the mouth and bottom of the cylinder 14 are sealed.

Note that the adhesive applied to the reinforcing sheet 18a is a thermoplastic adhesive 19 in the portion corresponding to the inlet valve, but it is better to use a water-soluble or heat-resistant adhesive in the other portions. The reason for this is that, as mentioned above, the problem occurs after the contents are filled into the bag from the inlet.

This is to prevent other adhesives from melting and peeling off when heat is applied to the adhesive 19 to close the air inlet.

With a bag with an inlet valve configured like this, the sealing of the mouth and bottom of the cylinder can be changed from conventional sewing machine sewing to gluing a reinforcing sheet, which can significantly shorten the work time. Since there is no seam at the bottom and each edge of the cylindrical body is also folded back together with the reinforcing sheet, the strength of the mouth and bottom is significantly increased. The inlet part of this bag filled with contents is shown in FIG. 8, and when opening the bag, the bag is overturned and the opening string 22 on the bottom side is connected to a reinforcing sheet. Grasp the reinforcing seam 18b using the notch 20 made in the edge and pull it upward. As shown in FIG. 6, the folded bottom edge 17b of the cylindrical body 14 is wrapped in the central portion of the reinforcing sheet 18b to which adhesive is not applied, so that the reinforcing sheet 18b is unsealed. After tearing with the string 22, as shown in Fig. 7, the folded part can be pulled out from the clamped state of the reinforcing seam 18b and easily returned to its original state, thereby opening the bottom of the p cylinder. I can do it.

The bag whose contents have been removed by opening the bottom of the cylinder in this manner can be reused very effectively. That is, as is clear from the above explanation, the remaining pieces of the reinforcing sheet 18b, which were torn from approximately the center, remain attached to both surfaces of the bottom of the cylinder, as shown in Figure 7. ing. As a result, the contents are filled again from the bottom of the cylinder, and this time, the bottom edge 17b of the cylinder is closed together with the remaining reinforcing sheet pieces on both sides by sewing, as shown by chain lines 24 in FIG. As a result, the reinforcing sheet for sealing the bottom of the cylinder that was originally used can be used as a reinforcing piece again when reusing it, making it possible to reuse it efficiently and effectively without having to place another reinforcing paper. can be done.

Furthermore, when the bag is reused, the bottom edge of the cylinder becomes the open end again, so the internal volume of the bag can be sufficiently secured without being particularly reduced. Therefore, the usage efficiency of this bag with an inlet valve is further improved, and the cost can be substantially reduced.

As explained above, according to the method of manufacturing a bag with an inlet valve of the present invention, the mouth and bottom of the cylinder can be sealed extremely quickly and efficiently, and the mouth and bottom can be sealed in the same manner as in the past. Since there are no perforations, the strength is high, and the reinforcing sheet can be used effectively for reusing the packaging body after opening, so the packaging body can be sealed without replenishing another piece of paper. This has excellent effects such as maintaining the strength of the parts and making it possible to reuse them at low cost.

[Brief explanation of drawings]

Figure ta+ is a plan view showing a cylindrical elongated sheet, which is the first step in the manufacturing method of a bag with an inlet valve according to the present invention, and Fig. 1 tbt is a plan view showing a cylindrical long sheet for a bag body from the long sheet. FIG. 2 is a perspective view showing a state in which the protrusion of the cylindrical body which becomes the inlet valve is opened in a trapezoidal shape, and FIG. 3 is a view inward from the opened state in FIG. A perspective view showing a folded state;
Figure 4 is a plan view showing the reinforcing sheet being applied to the mouth and bottom of the cylindrical body formed as shown in Figure 3 to seal it. A plan view showing the reinforcing sheets applied to the mouth and bottom of the cylinder with adhesive applied or an opening cord arranged, and Figure 6 is a schematic view of the main body with the mouth and bottom of the cylinder sealed. FIG. 7 is a cross-sectional view schematically showing the state of the bottom of the packaging body when the bottom is opened with an opening string, and FIG. It is a perspective view showing the inlet part of the inlet valve-equipped bag filled with contents. 10a, 10b...gusset part, 11...cylindrical long sheet, 12...・Protrusion, 14... Cylindrical body, 16... Inlet valve, 17a... Mouth edge, 17b... Bottom edge, 1.8a. isb... Reinforcement sheet, 22...・Opening string, 23a
. 23b...Folding line. Patent Applicant Showa Seifuku Kogyo Co., Ltd. Figure 1 (CI) (b) Figure 2 Figure 3 Figure 4 +7b 18b Figure 5 Figure 6 Figure 7 Figure 8 Procedural Amendment July 1980 - 9th Japan Patent Office Commissioner Gakudon Shiga1, Indication of the case 1982 Patent Application No. 2091962, Name of the invention Method for manufacturing a bag with an inlet valve 3, Person making the amendment Relationship with the case Patent Applicant Showa Seifuku Kogyo Co., Ltd. 4, Agent 5, Date of amendment order Showa, month, day (voluntary) (1)
"It is for the purpose of..." written on page 7, line 20 of the present application m1 is replaced with "It is for the purpose of..." Reinforcement sheet 18a
Since different types of adhesives are applied to the material, the method described in FIG. 5 may be time-consuming. Therefore, a piece of paper coated with a thermoplastic adhesive 19 and cooled in advance and a piece of paper coated with a water-soluble adhesive are formed separately, and these are bonded to each other at the edge margins and reinforced to a predetermined length l. A sheet may also be formed. ” will be corrected.

Claims (1)

[Claims] A long cylindrical sheet with gussets with a V-shaped cross section formed on both sides is cut so as to form a protrusion with a width including the gussets on the - side opening, and then cut at a predetermined distance from the cutting position. The cylindrical sheet is cut in a straight line at positions spaced apart from each other to form a cylindrical body for each bag, and the protrusion on the side opening of one side of the cylindrical body is The valve is opened into a substantially trapezoidal shape around the valley line of the cylinder and folded inward to form an inlet valve, and then the inlet is covered with the end of the mouth of the cylinder after being filled with the contents. Apply thermoplastic adhesive to the reinforcing sheet of the required width on the inlet side and the gap part, cool it, then cut it to a length that is approximately the same as the width of the cylinder, and extend it outward from the edge of the mouth. The reinforcing sheet is pasted in a protruding state, and the center part of the reinforcing sheet is attached to a reinforcing sheet having a width necessary to cover the bottom and edges of the cylindrical body in the same flow direction as the reinforcing sheet. A string for opening is arranged in the region, cut to have a length approximately the same as the width of the cylinder, and pasted so as to protrude outward from the bottom edge of the cylinder, and then attached to the opening. The reinforcing sheet is bent together with the end edge and a part of the bottom edge, and the parts of the reinforcing sheet protruding from each end edge of the cylindrical body are adhered to the folded side surface of the cylindrical body to form a mouth and a portion of the reinforcing sheet. A method for manufacturing a bag with an inlet valve, the method comprising sealing the bottom.