TWI538855B - A seamless bag and a method for manufacturing the same - Google Patents

Description

Seamless line packaging bag and manufacturing method thereof

The present invention relates to a packaging bag and a method of manufacturing the same, and more particularly to a seamless line packaging bag and a method of manufacturing the same.

As shown in Figures 1 and 2, the conventional woven bag 100 is often used to package a large amount of flour, salt, sugar, culture soil, plastic raw materials, cement and the like. When packaging, the existing woven bag 100 usually uses at least one suture 10, and then sewn a lower opening 11 at the bottom, and reserves an upper opening 12 to fill the contents, and finally sutures the upper woven bag 100. The opening 12 is used to complete the packaging operation. However, the sewing process generates a plurality of pinholes passing through the woven bag 100, which not only damages the structure of the woven bag 100 but may affect the support strength, and also facilitates the accumulation of water on the ground via the position of the suture 10 and the pinhole. Moisture and dust intrude into the woven bag 100, causing problems such as moisture, deterioration, and contamination of the contents, and the storage period is also shortened. Further, although the lower opening 11 is sewn through the suture 10, the degree of adhesion is still unsatisfactory.

In addition, as seen from FIG. 2, the above-described sewing method allows the woven bag 100 to be loaded with articles, and the area of the bottom load bearing weight is close to a line rather than a flat shape, and thus the bearing capacity is poor.

Accordingly, it is an object of the present invention to provide a packaging bag and a method of manufacturing the same that can improve the sealing property and the bearing capacity.

Thus, the method for manufacturing a seamless line package of the present invention comprises a preparation step, a cutting step, a crimping step, and an adhesive step. The preparation step is to prepare a seamless bag body, the bag body surrounds an accommodating space, and two bag mouths that communicate with the accommodating space, wherein the bag body has a symmetrical first body portion And a second piece body, and two pleats respectively connecting the first piece body portion and the second piece body portion to the accommodating space, and the bag body can be a polyethylene braid Film bag, polypropylene braided film bag, polypropylene bi-directional stretch film braided film bag, or polyethylene/polypropylene paper-plastic composite bag.

The cutting step is that two pockets are respectively cut along the boundary between the first sheet body and the two pleats, and the two slits define the first sheet body to define an adhesive area. The folding step is to fold the second body portion and the two pleating portions outwardly and upwardly according to the length of the two slits to form a laminated layer, and the first body portion is exposed to the adhesive region. And then folding the laminated layer downward and coating an adhesive layer on a region of the second body portion above the laminated layer. The adhesive step is to fold the adhesive region of the first body portion and the laminate layer at the same time, so that the adhesive region is adhered to the adhesive layer, so that the first body portion and the second sheet body The department is closely integrated and forms a seamless line of bags.

The effect of the invention is that no suture is used to avoid damaging the bag structure, and when the bag body is opened by the above manufacturing method, the bottom of the bag body is substantially rectangular and overlaps with the overlapping layer to improve the weight. Endurance.

21‧‧‧Preparation steps

22‧‧‧Cutting steps

23‧‧‧Folding steps

24‧‧‧Adhesive steps

3‧‧‧ bag body

301‧‧‧ accommodating space

302‧‧‧ bag mouth

31‧‧‧The first body

311‧‧‧adhesive area

32‧‧‧Second body

33‧‧‧ pleats

34‧‧‧ slotting

35‧‧‧Multilayer

36‧‧‧Adhesive layer

4‧‧‧Package

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a perspective view showing a conventional woven bag structure; FIG. 2 is a partial cross-sectional view, and FIG. 3 is a flow chart illustrating an embodiment of a method for manufacturing a seamless line packaging bag of the present invention; FIG. 4 is a perspective view for assisting a description of one cutting step of FIG. 3; FIG. 5 and FIG. 6 are partial cross-sectional views, respectively Figure 3 is a partial cross-sectional view; Figure 7 is a partial cross-sectional view to assist in explaining one of the pasting steps of Figure 3; and Figure 8 is a perspective view showing the aspect of the package of the present invention.

Referring to FIG. 3, an embodiment of a method of manufacturing a seamless line package 4 of the present invention includes a preparation step 21, a cutting step 22, a crimping step 23, and an pasting step 24.

Referring to FIG. 3 and FIG. 4 , the preparation step 21 is to prepare a seamless bag body 3 , the bag body 3 surrounds an accommodating space 301 , and two bag openings 302 that communicate with the accommodating space 301 . The bag body 3 has a first body portion 31 and a second body portion 32, and two of the first body portion 31 and the second body portion 32 are connected to each other. The pleated portion 33 is recessed in the space 301. In the embodiment, the bag body 3 can be a polyethylene (PE) woven laminating bag, a polypropylene (PP) woven laminating bag, a polypropylene biaxially stretched film (BOPP) woven laminating bag, or a polyethylene/poly. Acrylic paper-plastic composite bag. The cutting Step 22 is that two pockets 34 are respectively cut along the boundary between the first sheet body portion 31 and the two fold portions 33, and the two slits 34 define the first sheet portion 31. An adhesive area 311 is produced.

Referring to FIG. 3 to FIG. 5 , the folding step 23 is to fold the second body portion 32 and the two pleats 33 outwardly and upwardly according to the length of the two slits 34 to form a laminated layer 35 , and The first body portion 31 is exposed to the adhesive region 311. Then, as shown in FIG. 6, the laminated layer 35 is folded in half, and an adhesive layer 36 is applied to a region of the second body portion 32 above the laminated layer 35.

Referring to FIG. 3 and FIG. 7 , the pasting step 24 is to fold the adhesive layer 311 of the first body portion 31 and the overlapping layer 35 upward, so that the adhesive region 311 is adhered to the adhesive layer 36. The first sheet body portion 31 and the second sheet portion 32 are tightly joined, and the tightness of the bonding is ensured by rolling, thereby forming a seamless line of the packaging bag 4. As shown in FIG. 8, when the package 4 is opened, its bottom portion is substantially rectangular and overlaps the laminated layer 35.

Through the above steps, the present invention cooperates with the bonding step 24, except that the suture is not used to avoid damaging the structure of the bag body 3. The first piece body 31 is covered, which not only avoids the possibility of leakage of the contents, but also makes the bottom of the bag body 3 not see obvious crease marks and improves the appearance. In addition, when the packaging bag 4 is opened, the bottom portion thereof has a substantially rectangular shape and overlaps with the overlapping layer 35, thereby increasing the weight bearing area and the thickness of the bottom portion of the packaging bag 4, thereby further improving the weight bearing capacity and Durability.

Durability.

In summary, the manufacturing method of the present invention does not use sutures to avoid damaging the structure of the bag body 3, and when the bag body 3 is opened by the above manufacturing method, the bottom portion thereof is substantially rectangular and overlaps with the same. The layers 35 are overlapped to increase the bearing capacity, so that the object of the present invention can be achieved.

However, the above is only the embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and the patent specification of the present invention are still It is within the scope of the patent of the present invention.

21‧‧‧Preparation steps

22‧‧‧Cutting steps

23‧‧‧Folding steps

24‧‧‧Adhesive steps

Claims (3)

A manufacturing method of a seamless line packaging bag, comprising: a preparation step of preparing a seamless bag body, the bag body surrounding an accommodating space, and two bag mouths connecting the accommodating spaces, wherein The bag body has a first piece body portion and a second piece body portion, and two pleats respectively connecting the first piece body portion and the second piece body portion and recessing the receiving space The joint body, and the bag body can be a polyethylene braided film bag, a polypropylene braided film bag, a polypropylene bidirectional stretch film braided film bag, or a polyethylene/polypropylene paper-plastic composite bag; a cutting step, wherein a bag opening respectively cuts two slots along the boundary between the first body portion and the two pleats, the two slots defining the first body portion with an adhesive region; a crimping step The second body portion and the two pleat portions are folded outward and upward according to the length of the two slits to form a laminated layer, and the first body portion is exposed to the adhesive region, and the overlapping portion is further laminated. The layer is folded down in half, and an adhesive layer is coated on a region of the second body portion above the laminated layer; and an adhesive step And the adhesive layer of the first body portion and the overlapping layer are folded upward at the same time, so that the adhesive region is adhered to the adhesive layer, so that the first body portion and the second body portion are tightly coupled. And formed a seamless line of bags. The method for manufacturing a seamless line packaging bag according to claim 1, wherein in the pasting step, the adhesive region of the first sheet portion is closely adhered to the adhesive layer. The seamless line packaging bag produced according to the manufacturing method of claim 1, comprising a seamless bag body surrounding the receiving space and having a symmetrical first body portion and a a second body portion and two pleat portions respectively connecting the first body portion and the second body portion to the accommodating space, the second body portion and the two pleat portions Folding upwards to form a laminated layer, the first body portion covers the laminated layer and closely adheres to the second body portion, and when the package is opened, the bottom portion thereof is substantially rectangular and overlaps with the stack The layers overlap.