초록 ▼

The top end of a side gusset of a reclosable sack is securely closed as by means of spots of adhesive on and between the infolded gusset walls, leaving the bag walls free to spread relative to the gusset, and leaving the remainder of the gusset to its opposite end free to expand. A method and appara

The top end of a side gusset of a reclosable sack is securely closed as by means of spots of adhesive on and between the infolded gusset walls, leaving the bag walls free to spread relative to the gusset, and leaving the remainder of the gusset to its opposite end free to expand. A method and apparatus are provided for making the sacks.

대표청구항 ▼

In apparatus for making sacks having openable tops for access into the sacks, and each sack adapted to carry separable closure means across its top: means for transporting along a given path sack blanks each having an expansion gusset on at least one side and with an end of the gusset adjacent to a

In apparatus for making sacks having openable tops for access into the sacks, and each sack adapted to carry separable closure means across its top: means for transporting along a given path sack blanks each having an expansion gusset on at least one side and with an end of the gusset adjacent to a bag top end of the sack blank; and means located along said path for applying securing means selectively to said gusset end of each sack blank but leaving the remainder of the gusset of each sack blank freely expansible and leaving the openable top of each sack blank free for opening, and comprising means for spreading the gusset to facilitate application of adhesive to the inside of the gusset, an adhesive applicator selectively operable for applying respective spots of adhesive to limited portions at the inside walls of the gusset adjacent to said end and with the spot of adhesive on one wall being tansversely offset from the spot of adhesive on the other wall so that when the gusset walls are pressed back together the adhesive spots will engage adhesive-free areas of the respective opposing walls, and means downstream from said applicator for pressing the gusset walls together for assuring adhesion of the gusset walls to one another by means of the offset spots of adhesive.