Soft through air dried tissue

Patent metadata

Field	Value
Publication number	US-2016289898-A1
Application number	US-201615182391-A
Country	US
Kind code	A1
Filing date	Jun 14, 2016
Priority date	Aug 3, 2012
Publication date	Oct 6, 2016
Grant date	—

Abstract

A process for manufacturing tissue including providing a first pulp mix, delivering a wet-end additive to the first pulp mix at a first point in the process, forming a tissue web comprising the first pulp mix after the first point in the process, monitoring the tissue web for breaks and preventing delivery of the wet-end additive to the first pulp mix at the first point in response to detecting a break in the monitoring step. In an exemplary embodiment, a switching valve is used to control delivery of the wet-end additive to the first pulp mix.

First claim

What is claimed is:

1 . A process for manufacturing tissue, comprising:
providing a first pulp mix; delivering a wet-end additive to the first pulp mix at a first point in the process; forming a tissue web comprising the first pulp mix after the first point in the process; monitoring the tissue web for breaks; and preventing delivery of the wet-end additive to the first pulp mix at the first point in response to detecting a break in the monitoring step.

2 . The method of claim 1 , wherein the monitoring step is performed by a sensor that detects a break in the tissue web.

3 . The method of claim 2 , wherein the preventing step is performed by a switching valve that is responsive to the sensor.

4 . The method of claim 3 , further comprising closing the switching valve when the sensor detects a break in the tissue web.

5 . The method of claim 4 , wherein:
the step of forming the tissue web comprises:
forming a first exterior layer comprising a second pulp mix;
forming a second exterior layer comprising a third pulp mix; and
forming an interior layer between the first exterior layer and the second exterior layer comprising the first pulp mix.

6 . The method of claim 4 , further comprising rewinding the tissue web after detecting the break.

7 . The method of claim 6 , further comprising opening the switching valve after rewinding the tissue web.

8 . The method of claim 1 , wherein the wet-end additive comprises a debonder.

9 . A method of manufacturing tissue, comprising:
providing a wet-end additive to a first pulp mix at a first point in the process; forming a tissue web comprising the first pulp mix after the first point in the process; drying the tissue web to form a basesheet tissue; transferring the basesheet tissue from a first roll to a second roll; and preventing delivery of the wet-end additive to the first pulp mix at the first point in response to the transferring step.

10 . The method of claim 9 , wherein the preventing step is performed by a switching valve.

11 . The method of claim 10 , further comprising closing the switching valve prior to the transfer of the tissue web.

12 . The method of claim 11 , further comprising opening the switching valve after the tissue web has begun winding on the second roll.

13 . The method of claim 12 , wherein the second roll comprises:
a first section of basesheet tissue located at the center of the second roll, wherein the first section does not include the wet-end additive; and a second section of basesheet tissue located on the outside of the first section, wherein the second section includes the wet-end additive.

14 . The method of claim 13 , wherein the second roll further comprises a third section of basesheet tissue located on the outside of the second section, wherein the third section does not include the wet-end additive.

15 . The method of claim 9 , wherein the wet-end additive comprises a debonder.

16 . A system for making tissue, comprising:
a mixing section that provides a pulp mix, the mixing section including a wet-end adding section that adds a wet-end additive to the pulp mix; a forming section that forms a wet web from the pulp mix provided by the mixing section; a drying section that dries the wet web into a basesheet of tissue; a winding section that winds the basesheet tissue onto a roll; and a sensor that detects a break in the basesheet tissue; wherein operation of the wet-end adding section is controlled by the sensor.

17 . The system of claim 16 , wherein the wet-end adding section comprises a switching valve that is coupled to the sensor and through which the wet-end additive is added to the pulp mix.

18 . The system of claim 17 , wherein the switching valve is responsive to the sensor.

19 . The system of claim 18 , wherein the switching valve is closed when the sensor detects a break in the tissue web.

20 . The system of claim 16 , wherein the wet-end additive comprises a debonder.

21 . The system of claim 16 , wherein the forming section comprises a three layer headbox and the pulp mix is formed into an interior layer of the wet web.

Assignees

• First Quality Tissue Llc

Inventors

• Ramaratnam Karthik
• Miller Iv Byrd Tyler
• Hayes Shane Ervin
• Sealey Ii James E

Classifications

• D21F11/145

  including a through-drying process · CPC title

• D21H11/04

  Kraft or sulfate pulp · CPC title

• D21H21/20

  Wet strength agents · CPC title

• D21H21/18

  Reinforcing agents · CPC title

• D21H27/005

  relating to physical or mechanical properties, e.g. tensile strength, stretch, softness · CPC title