Huntsman Packaging Corporation

Bruce R Wilkes

Gordon F Pickering

A wicketless pack of thermoplastic bags includes a stack of a number of individual thermoplastic bags. Each of the bags has a bottom edge, upper and lower walls, a pair of side edges, and an open top end. A lip segment is provided adjacent the open end of each individual bag. The lip portion is an extension of the material forming the lower wall of a respective bag and includes at least one locating hole. A perforated tear line is formed between the open end of the bag and the lip portion. The lip segments of the stack are bonded together with ultrasonic vibratory energy to form a welded pad of lips as part of the bag pack. The welded pad is formed by moving at least one shaped ultrasonic horn downward through the stack of consecutive lips while activating the shaped horn with ultrasonic vibratory energy to form a continuous tapered weld through the stack of lip portions.

Wicketless plastic bag pack with tapered weld hole

A wicketless saddle pack of thermoplastic bags includes a first and second stack of a number of individual thermoplastic bags oppositely opposed over a common welded pad segment. Each of the bags has a bottom edge, upper and lower walls, a pair of side edges, and an open top end. A lip segment is provided adjacent the open end of each individual bag. The lip portion is an extension of the material forming the lower wall of a respective bag and includes at least one locating hole. A perforated tear line is formed between the open end of the bag and the lip portion. The lip segments of the two stacks are bonded together with ultrasonic vibratory energy to form the welded pad of lips. The welded pad is formed by moving at least one shaped ultrasonic horn downward through the stack of consecutive lips while activating the shaped horn with ultrasonic vibratory energy to from a continuous tapered weld through the stack of lip portions.

Growing community of inventors

Mendon, NY, United States of America

Bruce R Wilkes