A closer look at Human – Ketchup interaction

From a technical perspective, the human interaction with single-use condiment sachets can be broken down into several stages:

1. Picking up the sachet:
   This initial stage involves grasping the sachet between the thumb and index finger, often with a gentle pinch to ensure a secure hold. The size and shape of the sachet can affect this process, with smaller sachets potentially being more difficult to grasp.

2. Orienting the sachet:
   As the user prepares to open the sachet, they must orient it in their hand to locate the opening mechanism, typically a small notch or tear line. This requires visual attention and fine motor skills to adjust the sachet's position.

3. Opening the sachet:
   The user must apply gentle pressure to tear along the designated line or notch, which can be challenging due to varying levels of adhesive strength or material thickness. In some cases, users may need to use their teeth or other objects to assist in opening.

4. Dispensing contents:
   Once opened, users must carefully pour or squeeze out the desired amount of condiment onto their food. This stage requires precision and control to avoid spills or over-dispensing.

Technical challenges that arise during these stages include:

• Dexterity requirements:
  Users with limited dexterity or arthritis may struggle with grasping, orienting, and opening small sachets.

• Visual attention:
  Users may need to devote significant visual attention to locating and manipulating small openings or notches on the sachet.

• Fine motor control:
  Dispensing contents requires precise control over pressure and flow rate, which can be difficult for users with tremors or limited hand function.

• Adhesive variability:
  Sachets with inconsistent adhesive strength can lead to difficulties in opening or unexpected tearing.