초록 ▼

A bulk bag or a liner for a bulk container is formed from a plurality of tubular blanks of flexible material so that each wall of the bag or liner has at least two layers of material. Desirably, many woven or plastic sheet materials suitable to make such bags or liners are available in elongate and

A bulk bag or a liner for a bulk container is formed from a plurality of tubular blanks of flexible material so that each wall of the bag or liner has at least two layers of material. Desirably, many woven or plastic sheet materials suitable to make such bags or liners are available in elongate and circumferentially continuous tubular webs such that a plurality of liners or bags may be formed connected in end to end relation on an elongate web. In one form, a pair of gusseted tubular blanks are disposed between and sealed to a pair of overlying flat tubular blanks to define a liner or bag having two layers of material in each wall. In another form, a pair of tubular blanks are folded so that each tubular blank defines one flat panel and one gusseted panel and the tubular blanks are heat sealed along a pair of side edges of the liner or bag to also define a liner or bag having two layers of material in each wall. In still another form, a gusseted tubular blank may be disposed inside or outside of either of the previous forms to provide a liner or bag having each wall formed of three plies or layers of material. In any form, a bag or liner is provided with each wall formed from multiple layers of material and with each layer of each wall properly positioned and without having to stuff one bag or liner into another bag or liner.

대표청구항 ▼

1. A method of forming a bulk bag comprising the steps of:a) providing at least two tubular blanks of material each having a pair of opposed side edges and a pair of opposed ends; b) arranging the tubular blanks to form a pair of gusseted panels disposed between a pair of generally flat panels with

1. A method of forming a bulk bag comprising the steps of:a) providing at least two tubular blanks of material each having a pair of opposed side edges and a pair of opposed ends; b) arranging the tubular blanks to form a pair of gusseted panels disposed between a pair of generally flat panels with each gusseted panel and each flat panel having at least two layers of material; c) connecting together the free edges of the tubular blanks to define four interconnected side walls of the bag with each side wall formed from at least two layers of material; and d) connecting together the flat blanks with adjacent portions of the gusseted blanks along inclined lines of connection from the side edges of the flat panels extending inwardly towards the center of the blank to form a pair of end walls interconnected to the side walls with one end wall at each of a pair of opposed ends of the side walls and each end wall formed from at least two layers of material.