Bag body and manufacturing process thereof and knapsack with bag body

Abstract

The invention relates to a bag body and a manufacturing process thereof and a backpack with the bag body. The bag body comprises a cylindrical bag body with openings at the upper and lower ends and abag bottom connected to the opening at the lower end of the bag body; the inner side surface of the bag body is a waterproof layer; the outer side surface of the bag body is a cloth layer; an openingat the upper end of the bag body is used for taking and placing articles, the lower end of the bag body is used as a bag bottom, a flange overhanging into the bag body is integrally arranged at the edge of the bag body close to the bag bottom, an annular connecting piece is sewn on the outer side surface of the flange, and the outer side surface of the connecting piece is a waterproof layer, namely the flange and the connecting piece form an annular connecting part; the bag bottom comprises an inner bottom layer and an outer bottom layer, the inner bottom layer and the outer bottom layer are located on the upper side and the lower side of the connecting piece respectively and abut against each other, the two opposite side faces of the inner bottom layer and the outer bottom layer are waterproof layers, and the inner bottom layer, the connecting piece and the outer bottom layer are welded. Through the outer bottom layer, the bottom of the bag body is high in flatness and good in attractiveness, and meanwhile burrs at the bottom can be avoided.

Description

technical field [0001] The invention relates to the technical field of backpacks, in particular to a bag body with waterproof function, a manufacturing process of the bag body and a backpack with the bag body. Background technique [0002] A bag that has one or more compartments for storing items and has an openable or closed connection structure at the opening of the bag. Common connection structures are zippers, drawstring systems, snap buttons, Velcro, etc. . Existing bags are various, have different shapes and different materials according to different purposes, and are convenient for people to use on different occasions. [0003] For example, when encountering rainy days outdoors or outdoor sports such as camping or water sports, the bag needs to be designed as a sealed and easy-to-carry structure, so that it is convenient for people to use when raining, rafting, rowing, and swimming. . [0004] Existing common bag body fabrics with waterproof function use PVC waterp...

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned existing technical solutions have the following defects: the existing bag body is generally a cylindrical body, and when the end edge of the cylindrical body is turned inward, there will be multiple overlapping folded parts. When the folded part at the end is welded, it will make the overlapping folded part uneven after welding, that is, the joint is not smooth, and the outer surface of the bottom layer is a waterproof layer, which is inconsistent with the outer surface fabric of the bag body, which has an unsightly effect. During the use of the bottom of the bag body, because the edge of the inversion at the bottom of the bag body is exposed to the outside, there will be burrs on the edge after a long time of use

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