Cutting die for rotary die-cutting of label laminates

Patent metadata

Field	Value
Publication number	US-11020868-B2
Application number	US-201816186869-A
Country	US
Kind code	B2
Filing date	Nov 12, 2018
Priority date	Nov 14, 2017
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

A cutting die for rotary die-cutting of a label laminates is described herein. The cutting tools of the die include at least one of the following cutting edge parameters: effective height, shape and bevel angle arranged to be different in a first direction when compared to a second direction of the cutting die. The use of the cutting die, a method for designing a cutting die and a method for die-cutting a label laminate are also described.

First claim

The invention claimed is:

1. A cutting die for rotary die-cutting of a label laminate comprising cutting tools having cutting edges projecting out from a base surface of the cutting die and arranged at least in a first direction and a second direction along the base surface, wherein at least one of the following parameters of the cutting edges
effective height,
shape and
bevel angle

is arranged to be different in the first direction when compared to the second direction, wherein the cutting edges are arranged separately in the first direction and in the second direction along the base surface of the cutting die based on:
a determined difference in the die-cutting properties of the label laminate, and
number and shape of the labels to be aligned along the first direction and the second direction of the label laminate;
wherein the cutting die is a sheet, and wherein the sheet comprises a further material layer on the surface opposite to the base surface so as to provide difference of the effective height between the cutting edges in the first direction and in the second direction.

2. A cutting die according to claim 1 , wherein the difference of the effective height between the cutting edges in the first direction and in the second direction is between 5 and 15 μm.

3. A cutting die according to claim 1 , wherein the difference of the bevel angle between the cutting edges in the first direction and in the second direction is between 5 to 25°.

4. A cutting die according to claim 1 , wherein the first direction is a transverse direction of the cutting die and the second direction is perpendicular to the first direction.

5. A cutting die according to claim 1 , wherein a transverse direction of the cutting die is parallel to a transverse direction of the label laminate to be cut.

6. A method of cutting labels, including providing the cutting die according to claim 1 , and further comprising a step of providing a cutting roll for rotary die-cutting of a label laminate web so as to form individual labels attached on a release liner.

7. A cutting die according to claim 1 , wherein the determined difference in the die-cutting properties of the label laminate involves die-cutting force in the first direction corresponding to a transverse direction and in the second direction corresponding to a machine direction of the label laminate.

8. A cutting die according to claim 1 , wherein the cutting edges being arranged separately for the cutting edges arranged in the first direction and in the second direction is based on predetermined cutting pressure, the measured die-cutting forces, and the determined maximum and minimum contact lengths of the cutting edges of the cutting tools contacting the label laminate surface in a nip line.

9. A method for die-cutting a label laminate, wherein the method comprises
providing the cutting die of the rotary die-cutting machine according to claim 1 , arranging the label laminate between an anvil roll and a cutting roll comprising the cutting die spaced from the anvil roll;
providing a cutting pressure so as to provide a cutting force cutting a facestock layer and an adhesive layer of the label laminate by the cutting edges of the cutting tools of the cutting die in a nip line.

10. A method according to claim 9 , wherein the label laminate has a plastic facestock layer having asymmetry based on different orientation ratio in a machine direction in comparison to a transverse direction of the facestock layer.

11. A method according to claim 10 , wherein the plastic facestock layer is uniaxially oriented in the machine direction.

12. A method according to claim 11 , wherein the plastic facestock layer has the die-cutting force in the transverse direction higher than in the machine direction.

13. A method according to claim 9 , wherein the method comprises adjusting the cutting pressure so as to enable higher die-cutting force in a transverse direction when compared to a machine direction of the label laminate through providing difference in at least one of height, shape and bevel angle of the cutting edges in the first direction when compared to the cutting edges in the second direction for diminishing the difference in the die-cutting force.

Assignees

• Upm Raflatac Oy

Inventors

• Laurikainen Eliisa

Classifications

• B26F2001/4472

  Cutting edge section features · CPC title

• B26F2001/4481

  having special lateral or edge outlines or special surface shapes, e.g. apertures · CPC title

• B26F2001/4463

  Methods and devices for rule setting, fixation, preparing cutting dies · CPC title

• B26F1/44

  Cutters therefor; Dies therefor · CPC title

• B26D5/00

  Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting · CPC title