## 1 Introduction  
The growth of the inkjet printing market poses many different challenges. Printing on various polymers can cause adhesion problems due to their low surface energy and adhesion strength. To solve these issues, there are many treatments available to improve surface energy and enhance adhesion. They can all be divided into three main types: mechanical treatment, affecting mainly the surface topography (e.g., grit blasting, peel ply); chemical treatment using chemicals (e.g., solvent cleaning, primers, ultrasonic cleaning); and energetic treatments aimed primarily at surface free energy (e.g., plasma, corona, flame, UV/ozone), according to [PERSON] and [PERSON] [1].  
It was observed that UV/ozone, corona discharge and low-pressure plasma treatment methods did not significantly change the surface roughness of many polymers, [PERSON] et al. [2]. It is very important to preserve the previous view of the surface for printing on them. A solid surface is defined as a material that is rigid and resistant to stress. In inkjet printing, the roughness of the substrate significantly affects the diameter of the printed droplets, according to [PERSON] et al. [3]. The influence of the surface roughness factor impact was considered by [PERSON] et al. [4]. A solid surface can be characterized by its surface free energy and surface roughness which affect the adhesion strength.  
One of the main surfaces treatment methods for polymers is an economically affordable flame. Changes caused by the surface of the polypropylene homopolymer after flame treatment were investigated by [PERSON] et al. [5]. Adhesion between flame treated polypropylene and paint film was assessed using a composite butt test and the measured bond strength was found to be much higher than that obtained by solvent wiping or chlorinated polyolefin primers. The most important flame treatment properties can be profitably used to improve the wettability and adhesion properties of polyolefin surfaces without altering the optical internal parts of the surface, [PERSON] et al. [6]. [PERSON] and [PERSON] observed the adhesion of polyethylene and polypropylene [7]. They observed that these polymers with poor adhesive properties have a complex subject that requires an understanding of the excellent performance after some pre-treatment and the changes that result from this pre-treatment. Another example is atmospheric plasma treatment, which is relatively inexpensive and easier to integrate and operate on production lines. Plasma is produced by excitation of gas with electrical energy to make it highly reactive. This method is very effective in activating polymeric surfaces, [PERSON] et al. [8], [PERSON] et al. [9]. The effect of the treatment can last from 48 h to 7 days, as stated by [PERSON] et al. [10]. Atmospheric plasma treatment improved adhesion strength in different ways. The results show that in order to fully understand the mechanism of activation of this atmospheric pressure plasma flow system, it is necessary to take into account not only the reactions of the plasma surface, but also the post-plasma processes with the ambient gas atmosphere, see [PERSON] et al. [11] and [PERSON] et al. [12]. A vacuum plasma system with different frequency power was investigated to modify polyimide substrates to improve the surface treatment efficiency with respect to adhesive strength, [PERSON] et al. [13].  
Previous studies have shown that various pre-treatment methods have improved the adhesion strength of polyethylene (PE), polyethylene terephthalate (PET), polypropylene (PP), and high-density polyethylene (HDPE). In this work, research is related to increasing surface energy for inkjet printing. However, the effectiveness of the presented experiment still depends on the properties of materials, time, ink parameters, processing, and research conditions.