Performance test of the hottest composite surface

Performance test of composite surface material

self adhesive material is a kind of composite material, which is composed of surface material, adhesive, silicone oil coating and backing paper

the die cutting of self-adhesive materials is different from traditional printing materials, such as paper die cutting, which cuts through the material as a whole; The die cutting of self-adhesive materials is only to cut through the surface material and adhesive layer, retain the base paper and the silicone oil coating on its surface, and finally keep the die-cutting formed label on the base paper

the die cutting quality of self-adhesive materials is related to many factors, such as the die cutting mode, the precision of the die cutting device, the precision of the die cutting plate, and the matching of the die cutting blade with the material. In addition, the die cutting quality is also related to the characteristics of self-adhesive materials, such as the performance of face paper, adhesive and backing paper is different, and the die cutting characteristics of various self-adhesive materials are also different

the influence of the surface material, adhesive and backing paper of self-adhesive materials on the die cutting quality will be briefly introduced below

influence of surface material on die cutting

the factors that affect the quality of die cutting are the type, strength and thickness of surface material

1. Types of surface materials

surface materials can be basically divided into two categories: paper and film

the cutting principle of ordinary paper is different from that of thin-film materials with slight evaporation. The function of the condenser is to use the evaporator with low-pressure circulation as the condenser with high-pressure circulation. 2. The transmission system of the electronic universal experimental machine is different. Although in theory, the surface material and adhesive must be cut through during die-cutting, in fact, die-cutting paper materials are the combined result of tool cutting and paper stress fracture, that is, when the blade cuts downward, it also squeezes the paper to both sides. Therefore, relatively speaking, the die-cutting accuracy of paper materials is not very high. When analyzing samples, we often see that some labels have rough edges, which is caused by the natural fracture of the coarse material fibers

based on the die-cutting characteristics of paper materials and considering the wear of the blade, the angle of the flat die-cutting blade is usually set at 52. If the angle is large and the level of extensive and intensive management is improved, the extrusion deformation of the material will be large, that is, the separation force in the horizontal direction will aggravate the phenomenon of material fracture and separation

die cutting of thin film materials is simply the process of complete cutting. Because most of the film materials are ductile and will not fracture naturally, it is not suitable to cut through two-thirds of them. They must be completely cut through or cut through four fifths of the thickness, otherwise they will be stripped together with the label when discharged

therefore, the blade of die-cutting film materials should be sharp and have high hardness. A small angle die-cutting blade should be used, and the blade angle is usually 30 ~ 42. If a large angle die-cutting knife is used, it will not only be difficult to cut, but also if the blade is not sharp, the surface material will not be cut through, the bottom paper will be broken, or the edge of the finished label will be flanged, resulting in glue seepage. In short, the precision of die-cutting film is higher than that of paper materials, so die-cutting film materials have certain requirements for the accuracy of equipment, the accuracy of die-cutting plate and base paper

2. Strength of surface material

the strength of surface material is related to the thickness of surface material, fiber (polymer) structure and its own humidity. In the die-cutting process of self-adhesive materials, the biggest factor related to surface materials is the waste discharge speed. The higher the environmental humidity is, the weaker the strength of the material after being damped, so it is easy to break and even cannot be discharged

when designing the layout, we should reasonably arrange the waste size and speed of the label through experiments according to the strength of the material, which can not only improve the production efficiency, but also reduce the waste of materials

3. The thickness of the surface material

the thickness of the material directly affects the depth of die cutting. The thicker the material, the easier it is to die cut. Because the thicker the material, the greater the tolerance of die cutting, and the smaller the probability of cutting through the backing paper. Relatively speaking, the material is thin, and it is easy to cut through the bottom paper. For example, 80g/m2 and 60g/m2 surface materials with the same base paper are die cut on the same flat label die-cutting machine. The results show that: 80g/m I believe you have a definite understanding of this after reading it. 2. The waste discharge of material die cutting is normal, but when replacing 60g/m2 material, the waste discharge fracture, bottom paper cutting through and mark dropping often occur during die cutting, which requires frequent shutdown and pad, which is a great waste. There are many reasons for this kind of situation. This phenomenon can be reduced or avoided if the circular pressing die-cutting method is used or the die-cutting area is reduced, and the equipment with high precision is used

therefore, when cutting thin profile materials, it must be carried out on high-precision equipment, try to reduce the die-cutting area (especially small labels), use the die-cutting plates of professional die-cutting plate manufacturers, and pay attention to the accuracy of the pad

the thickness of the surface material is directly proportional to the strength, which directly affects the waste discharge speed. 80g/m2 and 60g/m2 materials can be used for waste discharge comparison test respectively; The result is that the production efficiency of the former is 20% - 30% higher than that of the latter