Linerless label

Patent metadata

Field	Value
Publication number	US-12325207-B2
Application number	US-202118023780-A
Country	US
Kind code	B2
Filing date	Sep 28, 2021
Priority date	Sep 29, 2020
Publication date	Jun 10, 2025
Grant date	Jun 10, 2025

Abstract

This invention relates to a method for manufacturing a direct thermal linerless label web ( 100 ), the direct thermal linerless label web ( 100 ) comprising a face ( 110 ) having a multilayer structure comprising at least three layers, the face comprising a base layer ( 113 ), a direct thermal printable coating ( 115 ), and an intermediate layer ( 114 ) disposed between the base layer and the direct thermal printable coating, wherein the intermediate layer has a grammage in a range between 0.9 g/m 2 and 7 g/m 2 , total amount of mineral pigments in the intermediate layer is equal to or less than 4 g/m 2 , and a mineral pigment content of the intermediate layer is less than 85 wt. %, preferably equal to or less than 75 wt. %, calculated from total dry weight of the intermediate layer, wherein the method comprises: supplying the face ( 110 ), applying a water-based acrylic adhesive coating ( 121 ), and the thermally drying the adhesive coating ( 121 ) into a pressure sensitive adhesive coating ( 120 ), wherein the water-based acrylic adhesive coating ( 121 ) is applied onto the face, or the water-based acrylic adhesive coating ( 121 ) is applied on to a carrier material, and the method further comprises: transferring the pressure sensitive adhesive coating from the carrier material on to the face. This invention further relates to a direct thermal linerless label web ( 100 ), and a use of a direct thermal linerless label ( 100 ) in on-demand printing.

First claim

The invention claimed is:

1. A method for manufacturing a direct thermal linerless label web, the direct thermal linerless label web comprising a face having a multilayer structure comprising at least three layers, the face comprising
a base layer,
a direct thermal printable coating, and
an intermediate layer disposed between the base layer and the direct thermal printable coating,
wherein
the intermediate layer has a grammage in a range between 0.9 g/m 2 and 7 g/m 2 ,
the intermediate layer comprises
a binder, and
at least one pigment selected from a group consisting of a mineral pigment and a non-mineral pigment,

total amount of the mineral pigments in the intermediate layer is between 0 and 4 g/m 2 , and
a mineral pigment content of the intermediate layer is between 0 wt. % and less than 85 wt. %, calculated from total dry weight of the intermediate layer,
a total mineral content of the direct thermal linerless label web is in a range between 0 and 20 wt. %, calculated from total dry weight of the direct thermal linerless label web, and
wherein the method comprises
supplying the face,
applying a water-based acrylic adhesive coating, and
thermally drying the adhesive coating into a pressure sensitive adhesive coating, wherein
the water-based acrylic adhesive coating is applied on to the face, or
the water-based acrylic adhesive coating is applied on to a carrier material, and the method further comprises:
transferring the pressure sensitive adhesive coating from the carrier material on to the face.

2. The method according to claim 1 , wherein the base layer is an uncoated base paper having
a grammage in a range between 38 g/m 2 and 82 g/m 2 , and/or
a mineral pigment content of equal to or less than 18 wt. %.

3. The method according to claim 1 , wherein the adhesive coating comprises
an emulsified silicone additive, the amount of the emulsified silicone additive being in a range between 1 wt. % and 6 wt. %, calculated from the total dry weight of the adhesive coating.

4. The method according to claim 1 , wherein the intermediate layer has a grammage in a range between 1 g/m 2 and 5 g/m 2 .

5. The method according to claim 1 , wherein the total amount of mineral pigments in the intermediate layer is equal to or less than 2 g/m 2 .

6. The method according to claim 1 , wherein the mineral pigment content of the intermediate layer is equal to or less than 60 wt. %, calculated from total dry weight of the intermediate layer.

7. The method according to claim 1 , wherein a binder content of the intermediate layer is equal to or more than 20 wt. %, calculated from total dry weight of the intermediate layer.

8. The method according to claim 1 , wherein the adhesive coating has a coat weight in a range between 10 g/m 2 and 25 g/m 2 , calculated as total dry weight of the adhesive coating.

9. The method according to claim 1 , wherein the pressure sensitive adhesive coating is on a second side of the face and a total coverage of the adhesive coating is in a range between 10% and 90%, calculated from the total area of the second side.

10. The method according to claim 1 , wherein the direct thermal printable coating has a grammage in a range between 1 g/m 2 and 5 g/m 2 .

11. The method according to claim 1 , wherein the face further comprises a top coating on the direct thermal printable coating, wherein the top coating has a grammage in a range between 0.5 g/m 2 and 3 g/m 2 .

12. A direct thermal linerless label web obtainable by a method according to claim 1 .

13. A direct thermal linerless label web comprising
a face, and
a water-based acrylic pressure sensitive adhesive coating on the face, wherein the face comprises:
a base layer,
a direct thermal printable coating, and
an intermediate layer disposed between the base layer and the direct thermal printable coating,
wherein
the intermediate layer has a grammage in a range between 0.9 g/m 2 and 7 g/m 2 ,
the intermediate layer comprises
a binder, and
at least one pigment selected from a group consisting of a mineral pigment and a non-mineral pigment,

a total amount of the mineral pigments in the intermediate layer is between 0 and 4 g/m 2 , and
a mineral pigment content of the intermediate layer is between 0 wt. % and less than 85 wt. %, calculated from total dry weight of the intermediate layer, and
a total mineral content of the direct thermal linerless label web is in a range between 0 and 20 wt. %, calculated from total dry weight of the direct thermal linerless label web.

14. The direct thermal linerless label web according to claim 13 , wherein the base layer is an uncoated base paper having
a grammage in a range between 38 g/m 2 and 82 g/m 2 , and/or
a mineral pigment content of equal to or less than 18 wt. %.

15. The direct thermal linerless label web according to claim 13 , wherein the pressure sensitive adhesive coating comprises
an emulsified silicone additive, the amount of the emulsified silicone additive being in a range between 1 wt. % and 6 wt. %, calculated from the total dry weight of the adhesive coating.

16. The direct thermal linerless label web according to claim 13 , wherein the intermediate layer has a grammage in a range between 1 g/m 2 and 5 g/m 2 .

17. The direct thermal linerless label web according to claim 13 , wherein the total amount of mineral pigments in the intermediate layer is equal to or less than 2 g/m 2 .

18. The direct thermal linerless label web according to claim 13 , wherein the mineral pigment content of the intermediate layer is equal to or less than 60 wt. %, calculated from total dry weight of the intermediate layer.

19. The direct thermal linerless label web according to claim 13 , wherein a binder content of the intermediate layer is equal to or more than 20 wt. %, calculated from total dry weight of the intermediate layer.

20. The direct thermal linerless label web according to claim 13 , wherein the adhesive coating has a coat weight in a range between 10 g/m 2 and 25 g/m 2 , calculated as total dry weight of the adhesive coating.

21. The direct thermal linerless label web according to claim 13 , wherein the pressure sensitive adhesive coating is on a second side of the face and a total coverage of the adhesive coating is in a range between 10% and 90%, calculated from the total area of the second side.

22. The direct thermal linerless label web according to claim 13 , wherein the direct thermal printable coating has a grammage in a range between 1 g/m 2 and 5 g/m 2 .

23. The direct thermal linerless label web according to claim 13 , wherein the face further comprises a top coating on the direct thermal printable coating, wherein the top coating has a grammage in a range between 0.5 g/m 2 and 3 g/m 2 .

24. A method of using a direct thermal linerless label web according to claim 13 in on-demand printing.

Assignees

• Upm Raflatac Oy

Inventors

• Kivimaki Juha

Classifications

• G09F2003/026

  without silicon backing · CPC title

• G09F2003/0211

  Transfer or thermo-sensitive · CPC title

• B31D1/026

  Cutting or perforating (B31D1/022 takes precedence) · CPC title

• B31D1/027

  involving, marking, printing or coding · CPC title

• B31D1/021 Primary

  Making adhesive labels having a multilayered structure, e.g. provided on carrier webs · CPC title