Spot laminator with charging bar
AssigneeAF Machine Inc.
InventorEdward McCardell
Life of this patent
Estimating the term…
Abstract
A charging bar applies a static charge to a printed label as it is fed in to a grounded adhesive applicator roll. The charged label is drawn to the grounded roll, and thereby obtains even coating of adhesive on the underside of the label, while avoiding contamination of the printed surface of the label with adhesive. The adhesive coated label is carried by a transfer roll to a laminating nip where it is adhered to a corrugated substrate.
Claims8
In a laminator for attaching a label sheet having an upper side and a lower side to an underlying substrate sheet, the laminator comprising:
- a frame
- an adhesive fountain containing a quantity of liquid adhesive;
- a rotatable adhesive applicator roll mounted to the frame to receive adhesive from the fountain, the adhesive applicator roll having a surface which receives the adhesive;
- a label feed positioned to discharge label sheets to the adhesive applicator roll surface to apply adhesive to the lower side of each label sheet;
- a rotating transfer roll mounted to the frame to engage the upper side of each label sheet and receive each label sheet as it passes from the adhesive applicator roll;
- a laminating nip defined between two rolls;
- and
- a substrate feed positioned to advance substrate sheets to the laminating nip, the transfer roll discharging each adhesive coated label sheet such that the lower side of each label sheet engages a substrate sheet at the laminating nip, the label sheet being thus attached to the substrate sheet at the laminating nip, the improvement comprising:
- a charging bar spaced from the adhesive applicator roll to apply a static charge to the label sheet as it is discharged from the label feed prior to its engagement with the adhesive on the applicator roll surface, to thereby cause the label sheet to be attracted toward the adhesive applicator roll surface for the uniform application of adhesive to the lower side of the label sheet.
A laminator for attaching a label sheet having an upper side and a lower side to an underlying substrate sheet, the laminator comprising:
- a frame;
- a quantity of adhesive;
- a rotatable adhesive applicator roll mounted to the frame to receive adhesive from the quantity of adhesive, the adhesive applicator roll having a surface which receives the adhesive;
- a label feed positioned to discharge label sheets to the adhesive applicator roll surface;
- a charging bar spaced from the adhesive applicator roll to apply a static charge to the label sheet as it is discharged from the label feed prior to its engagement with the adhesive on the applicator roll, to thereby cause the label sheet to be attracted toward the adhesive applicator roll surface for the uniform application of adhesive to the lower side of the label sheet;
- a laminating nip positioned downstream of the adhesive applicator roll;
- a means for transferring the label sheet from the adhesive applicator roll to the laminating nip;
- and
- a substrate feed positioned to advance substrate sheets to the laminating nip to engage a substrate sheet with the lower side of each label sheet to thus attach each label sheet to the substrate sheet at the laminating nip.
Dependencies are inferred from the claim text.