In the run-up to the test, we defined practical requirements and the following test criteria:
- Punching power
- Functional scope
In order to be able to evaluate these criteria, we have defined several tests for the spiral binding machines. First, the scope of delivery and functions of the devices are checked. In the first test runs, we check whether the machines can punch 10 sheets at once.
The next step is to determine the maximum number of sheets the machines can punch at one time without losing quality. DIN A4 sheets are used for this purpose.
The cleanliness of the punched holes and the amount of force required are assessed. In further test runs, the procedure is carried out with DIN-A5 sheets.
During tying, it is also checked whether the devices are stable enough to be operated with one hand. Once the folders are bound, the turning of the pages, the cleanliness of the holes and the stability of the folder are assessed. Finally, it is checked how easy it is to empty the punching compartment.
In order to rule out errors and to ensure the load of everyday use, each test takes place in several rounds.
The test criteria receive percentages depending on their importance. The final score is then objectively calculated from the test criteria using an algorithm.
Our product selection is based on an observation of the current market. In addition to popular branded products, we also include insider tips in our selection. Criteria such as price and range of functions are an important factor for us. The test field is also determined by analysis and evaluation of customer reviews and external tests (e.g. Stiftung Warentest).
The devices are purchased anonymously or lent to us by the manufacturer. Dealers and manufacturers have no influence on the tests and our evaluation.
As soon as new relevant products come onto the market, our test field is extended by these. The new products go through the same test as the already tested devices.