Rotary bag making machine for drawstring bags
AssigneeCustom Machinery Design, Inc.
InventorPeter J. Gietman, Jr.
Life of this patent
Estimating the term…
Abstract
The rotary bag making machine of the present invention is adapted to make side seal bags having a plastic drawstring through a hem in the top of the bag. More specifically. The rotary bag machine of the present invention includes a two part, elongate sealing bar having sealing edges, the first part of which is heated to a first temperature for sealing two layers of plastic bag material and the second part of which is heated to a second higher temperature for sealing the six layers which are present when hems are formed with inserted drawstrings. The second part of the seal bar is not only designed to form the seal but to heat weld together the drawstring plastic so that it will not separate or tear apart when the bag is gathered and subsequently tied with the drawstring.
Claims9
An improved sealing bar for a bag making machine adapted to perform a heat sealing operation on plastic film material along a line and wherein the sealing temperature is preferably different at different locations along said line, said sealing bar being non-rotative and comprising an elongate member having first and second portions each portion respectively defining a hollow bore along its length and means disposed in the respective hollow bores for independently heating said portions of said bar, and control means for each of said heating means.
An improved sealing bar for a rotary bag machine adapted to perform side sealing operations on a film web which includes along one side a paid of folded hems containing drawstring plastic tape material, said sealing bar being non-rotative and having a first hollow end portion adapted to seal the folded hems and including first internally disposed means for heating said first end portion and a first control means for said heating means for providing a first temperature to said first end portion, a second hollow end portion comprising the remaining length of said sealing bar and including a second internally disposed means for heating said remaining length, and a second control means for providing a second lesser temperature to said remaining portion.
Dependencies are inferred from the claim text.