Induction heat sealing device and a method for transversally seal a tube of packaging material

Patent metadata

Field	Value
Publication number	US-12240643-B2
Application number	US-202318364361-A
Country	US
Kind code	B2
Filing date	Aug 2, 2023
Priority date	Feb 5, 2019
Publication date	Mar 4, 2025
Grant date	Mar 4, 2025

Abstract

An induction heat sealing device for providing a transversal sealing of a tube of packaging material, said induction heat sealing device comprising a main body comprising a first and a second sealing surface arranged to face the packaging material during a sealing state, a recess provided in the main body for receiving a knife during a cutting state, wherein the first and second sealing surface are placed on opposite sides of the recess, and an electric conductor arrangement in the main body, for inducing eddy currents in the packaging material during the sealing state, wherein at least part of the first and second sealing surface are inclined and provided with a first and a second top section, respectively, such that particles in a product inside the tube are pushed away from a sealing band of the tube as the sealing band is pressed towards the first and second top section.

First claim

The invention claimed is:

1. An induction heat sealing device for providing a transversal sealing of a tube of packaging material, the induction heat sealing device comprising:
a main body comprising a first sealing surface, a second sealing surface, and a recess, the recess configured to receive a knife;
at least one electric conductor arrangement in the main body, the at least one electric conductor arrangement configured to induce eddy currents in the packaging material; and
a counter-pressure arrangement opposite the main body, wherein the counter-pressure arrangement comprises convex-shaped pad surfaces,
wherein the first and second sealing surface are on opposite sides of the recess, wherein the first sealing surface extends from the recess to a first end of the main body, and the second sealing surface extends from the recess to a second end of the main body opposite the first end, wherein the first sealing surface is inclined across the entire first sealing surface and the second sealing surface is inclined across the entire second sealing surface.

2. The induction heat sealing device according to claim 1 , wherein the first sealing surface and the second sealing surface slope downward away from the recess.

3. The induction heat sealing device according to claim 1 , wherein the first sealing surface and the second sealing surface are symmetrical with respect to the recess.

4. An induction heat sealing device for providing a transversal sealing of a tube packaging material, the induction heat sealing device comprising:
a main body comprising a first sealing surface, a second sealing surface, and a recess, the recess configured to receive a knife;
at least one electric conductor arrangement in the main body, the at least one electric conductor arrangement configured to induce eddy currents in the packaging material; and
a counter-pressure arrangement opposite the main body, wherein the counter-pressure arrangement comprises convex-shaped pad surfaces,
wherein the first sealing surface and the second sealing surface are on opposite sides of the recess, and wherein the first sealing surface comprises a first portion inclined at a first slope, and a second portion inclined at a second slope comprising a different slope angle from the first slope wherein the first portion extends from the recess to the second portion and the second portion extends from the first portion to a first end of the main body.

5. The induction heat sealing device according to claim 4 , wherein the second sealing surface comprises a third slope, a fourth slope comprising a different slope angle from the third slope, and a second top portion between the third slope and the fourth slope.

6. The induction heat sealing device according to claim 4 , wherein the first sealing surface and the second sealing surface are symmetrical with respect to the recess.

7. The induction heat sealing device according to claim 1 , wherein the main body is configured to move a direction of the tube packaging material while providing the transversal sealing.

8. The induction heat sealing device according to claim 4 , wherein the main body is configured to move a direction of the tube packaging material while providing the transversal sealing.

Assignees

• Tetra Laval Holdings & Finance

Inventors

• Karlsson Per
• Palmquist Patrik
• Lindvall Magnus
• Melin Max
• Andersson Håkan
• Israelsson Karl

Classifications

• B65B9/08

  in a web folded and sealed transversely to form pockets which are subsequently filled and then closed by sealing · CPC title

• B65B51/227

  by induction welding · CPC title

• B29C66/849

  Packaging machines · CPC title

• B29C66/4312

  for making flat seams in tubular or hollow articles, e.g. transversal seams · CPC title

• B29C66/1122

  Single lap to lap joints, i.e. overlap joints (B29C66/45, B29C66/472, B29C66/52272 take precedence) · CPC title