Importance

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Abstract

A draw tape bag forming apparatus includes an edge folder for folding the edges of pliable plastic web to form a hem in the edge. A draw tape is fed into the open hem which is then heat sealed along the inner edge of the hem wall to form a tubular hem. The web is of an indefinite length and moves continuously through the machine. The heat sealed hem is an expanded air-filled type hem. An electrostatic generator unit is mounted downstream of the ballooned hem. The generator unit includes a charging bar mounted in spaced relation to reference ground plate to form a gap with the ballooned hem passing therebetween. The hem is aligned with the bar. A 120 volt power supply is connected to the charging bar and establishes a high voltage along the length of the bar. An electrostatic field is created across the gap and induces a charge in the walls of the hem the hem collapses against the ground plate to form a flat hem in the web for subsequent passing of the web through a bag making machine which seals and severs the web on longitudinally spaced lines to form the bags. The power supply may establish a negative voltage relative to the ground plate. The power supply may be directly connected to the bar and plate.

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First Claim