Cutting unit, web of packaging material, and method for cutting preparation features into it

Patent metadata

Field	Value
Publication number	US-11338534-B2
Application number	US-201716302042-A
Country	US
Kind code	B2
Filing date	May 15, 2017
Priority date	May 16, 2016
Publication date	May 24, 2022
Grant date	May 24, 2022

Abstract

A cutting unit for cutting preparation features in a web of sheetlike material is provided. The cutting unit has a first part with a rigid base portion, at least one first cutting tool configured to cut a first preparation feature in the web of sheetlike material, and at least one second cutting tool configured to cut a second preparation feature in the web of sheetlike material. The at least one first and second cutting tools are attached to the base portion and located at a distance from each other, wherein at least one of the at least one first or second cutting tools is supported by a flexible support that is located in the rigid base portion of the first part.

First claim

The invention claimed is:

1. A cutting unit for cutting preparation features in a web of sheetlike material, said cutting unit comprising:
a first part with a rigid base portion,
at least one first cutting tool configured to cut a first preparation feature in the web of sheetlike material,
at least one second cutting tool configured to cut a second preparation feature in the web of sheetlike material;
the at least one first cutting tool and the at least one second cutting tool located at a distance from each other;
wherein the at least one first cutting tool and the at least one second cutting tool are supported by a first flexible support and a second flexible support respectively, the first flexible support and the second flexible support located in the rigid base portion of the first part and each having a surface configured to face toward a second part configured, in operation, to cooperate with the first part and the web of sheetlike material therebetween such that the first and second parts produce at least two preparation features on the web of sheetlike material;
wherein the at least one first cutting tool is disposed on the surface of the first flexible support and is configured to extend perpendicularly away from the surface of the first flexible support towards the second part such that a cutting surface of the at least one first cutting tool is disposed between the first flexible support and the second part; and
wherein the at least one second cutting tool is disposed on the surface of the second flexible support and is configured to extend perpendicularly away from the surface of the second flexible support towards the second part such that a cutting surface of the at least one second cutting tool is disposed between the second flexible support and the second part;
wherein a hardness of a material of the first flexible support is different than a hardness of a material of the second flexible support.

2. The cutting unit according to claim 1 , further comprising the second part with at least one first rigid base portion.

3. The cutting unit according to claim 2 , wherein the at least one first rigid base portion in the second part is supported by a flexible support different from the first flexible support and the second flexible support in the rigid base portion of the first part.

4. The cutting unit according to claim 1 , wherein the first part comprises at least one third cutting tool configured to cut a third preparation feature in the web of sheetlike material, wherein the third preparation feature is different from the first and second preparation features.

5. The cutting unit according to claim 4 , wherein the at least one third cutting tools is supported by a third flexible support and wherein a hardness of a material of the third flexible support is different than the hardness of the materials of the first and second flexible supports.

6. The cutting unit according to claim 1 , wherein the at least one first cutting tool comprises a cylindrical shape and protrudes from the rigid base portion.

7. The cutting unit according to claim 1 , wherein the at least one second cutting tool comprises a plurality of protrusions circularly or elliptically arranged at a distance from each other.

8. A web of sheetlike material comprising a plurality of crease lines along which the web of sheetlike material is configured to be folded into a container, the web of sheetlike material further comprising the first and the second preparation features aligned with each other, the first and second preparation features being applied by the cutting unit according to claim 1 .

9. A cutting unit for cutting preparation features in a web of sheetlike material, said cutting unit comprising:
a first part with a rigid base portion,
at least one first cutting tool configured to cut a first preparation feature in the web of sheetlike material,
at least one second cutting tool configured to cut a second preparation feature in the web of sheetlike material;
at least one third cutting tool configured to cut a third preparation feature in the web of sheetlike material;
the at least one first cutting tool, the at least one second cutting tool, and the at least one third cutting tool being attached to the rigid base portion of the first part, located at a distance from each other;
wherein the at least one first cutting tool, at least one second cutting tool, and the at least one third cutting tool are supported by a first flexible support, a second flexible support, and a third flexible support respectively, wherein the first flexible support, the second flexible support, and the third flexible support are located in the rigid base portion of the first part, and each having a surface configured to face toward a second part configured, in operation, to cooperate with the first part and the web of sheetlike material therebetween such that the first and second parts produce at least three preparation features on the web of sheetlike material;
wherein the at least one first cutting tool is disposed on the surface of the first flexible support and is configured to extend perpendicularly away from the surface of the first flexible support towards the second part such that a cutting surface of the at least one first cutting tool is disposed between the first flexible support and the second part;
wherein the at least one second cutting tool is disposed on the surface of the second flexible support and is configured to extend perpendicularly away from the surface of the second flexible support towards the second part such that a cutting surface of the at least one second cutting tool is disposed between the second flexible support and the second part;
wherein the at least one third cutting tool is disposed on the surface of the third flexible support and is configured to extend perpendicularly away from the surface of the third flexible support towards the second part such that a cutting surface of the at least one third cutting tool is disposed between the third flexible support and the second part; and
wherein a hardness of a material of the first flexible support, a hardness of a material of the second flexible support, and a hardness of a material of the third flexible support are different from each other.

10. A method of cutting preparation features in a web of sheetlike material, comprising:
receiving a web of sheetlike material at a cutting and/or creasing station;
passing the web of sheetlike material between a first and a second part of a cutting unit, located at a first and a second cutting and/or creasing roll, wherein the first part of the cutting unit comprises at least one first cutting tool and at least one second cutting tool, and wherein the second part of the cutting unit comprises an anvil against which the web of sheetlike material and the first part of the cutting unit is pressed;
pressing the first and second cutting and/or creasing rolls against the web of sheetlike material and against each other; and
producing at least one first preparation feature and at least one second preparation feature aligned with each other, wherein the at least one first cutting tool and the at least one second cutting tool are respectively disposed on a surface of a first flexible support configured to face toward the second part and on a surface of a second flexible support configured to face toward the second part, wherein the at least one first cutting tool is configured to extend perpendicularly away from the surface of the first flexible support towards the second part such that a cutting surface of the at least one first cutting tool is disposed between the first flexible support and the second part, wherein the at least one se

Assignees

• Tetra Laval Holdings & Finance

Inventors

• Hedberg Torbjörn

Classifications

• B26F1/384 Primary

  using rotating drums · CPC title

• B26F1/44

  Cutters therefor; Dies therefor · CPC title

• B31B2120/302

  collapsible into a flat condition · CPC title

• B26F1/18

  Perforating by slitting, i.e. forming cuts closed at their ends without removal of material · CPC title

• B26F1/08

  wherein the tools are carried by, and in operation move relative to, a rotative drum or similar support · CPC title