# The Efficiency of Edge Banding Module in a Mass Customized Line for Wooden Doors Production
## 2 Materials and Methods  
The edge banding module, which is crucial to the performance of the entire TechnoPORTA line was selected for testing. During the production process, each door leaf passes through this module at least three times (up to six times) to process three edges (two sides and one top). Therefore in order to produce one door leaf, the module must perform from three to six working cycles. In this process, subsequent machining units perform the following actions:  
1. Feeding door leaves for production (feeding portal);
2. Reference edge milling (reference milling machine);
3. Edge processing (the edge with a rebate processing machine);
4. Stacking and transfer to the further processing of door leaves (two-way stacking portal). The arrangement diagram and the most important machine units are shown in Figures 1 and 2. Figure 1: The arrangement diagram and the most important machine units of the edge banding module. The research process consisted of two stages. In the first stage, machining data were collected from 14 September to 5 December 2020. Then, the data obtained from the IT system controlling the operation of the line were in the form of *.csv files. These data were analyzed in MS Excel software to determine the efficiency of the edge banding module. A sample layout of machine data in a *.csv file is shown in Figure 3.  
First, the data were sorted based on the \"CYCLE\" column (Figure 4). When the value in the column changed from \"1\" to \"3\", for example, it means that an entire pallet of one type of door leaf has gone through the machine tools to machine one edge, and then the machines are retooled to another type of door leaves ready on the next pallet. Using the \"IF(C1 <> C2; 1; 1; 0)\" function, the data from the \"CYCLE\" column can be used to determine the moment when the machine retooling occurs. Passing through the first door leaf after retooling, it is marked with the number 1 in the \"L\" column. Then, in the \"M\" column, based on the \"L\" column, each series of processed door leaves is sequentially numbered thanks to the formula \"=L2 + M1\". Figure 2: The units of the edge banding module: (**A**) feeding portal, (**B**) reference milling machine, (**C**) edge processing machine, (**D**) two-way stacking portal. Based on the obtained data in column F (Date), the start and end time of the work shift could be determined. Based on these times, the production time for each day of door leaves production was calculated. From column B (Production Barcode ID), it was possible to count the number of working cycles performed on the door leaves produced each production day. These two parameters are very important for the main parameter characterizing production (i.e., the number of cycles performed per minute). Column J shows the times of a working cycle for the production of door leaves. From these data, it was possible to calculate the average production time per working cycle using the function \"=AVERAGE(Jxjy)\". Using the function \"=MODESNGL(Jxjy)\" it was possible to find the most frequently occurring working cycle time, and using the function \"=COUNTIF(Jxjy;most frequent time)\", we could count how many times this time was reached during production. Figure 4: An example of the machine data sorted by the column “CYCLE”. Figure 3: An example of the machine report. Column K shows the retooling time. Using the filter, it was possible to extract and display only those rows containing times when retooling occurred. From the data displayed in this way, it was possible to calculate the average time for retooling for individual production days \"=AVERAGE(Kx;Ky)\" and the number of retooling occurred \"=COUNT(Kx;Ky)\". All of these parameters (mean time of production per one working cycle, mean time of retooling, number of retooling, number of door leaves leaving in a series, most frequent time of series) were summarized in a sheet (Figure 5) and then processed in the form of graphs.