Soft through air dried tissue
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.
1. A system for making tissue, comprising:
a mixing section that provides a pulp mix, the mixing section including a wet-end adding section that delivers a wet-end additive to the pulp mix at a first point in a process for manufacturing tissue;
a forming section that forms after the first point in the process 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 so that delivery of the wet-end additive to the pulp mix is prevented at the first point in response to the sensor detecting a break in the basesheet tissue.
2. The system of claim 1 , 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.
3. The system of claim 2 , wherein the switching valve is responsive to the sensor.
4. The system of claim 3 , wherein the switching valve is closed when the sensor detects a break in the tissue web.
5. The system of claim 1 , wherein the wet-end additive comprises a debonder.
6. The system of claim 1 , wherein the forming section comprises a three layer headbox and the pulp mix is formed into an interior layer of the wet web.