Fundamentals of flexographic printing double sided tape

Flexographic plate pasting double-sided tape is simply the link between fixing the printing plate and fixing the printing plate roller. With the vigorous development of flexographic printing, the industry has higher and higher requirements for double-sided adhesive tape. In order to meet the needs of printing enterprises, tape manufacturers have increasingly subdivided tape density, tape viscosity and tape thickness. Therefore, the reasonable selection of double-sided tape can not only improve the printing quality, but also improve the printing efficiency.

First, let's take a look at the structure of double-sided tape. The complete product structure is:

The three key layers adhesive tapeare:

Glue stabilized film layer: its function is to stabilize the tape foam layer, provide a stable tape thickness, prevent stretching and twisting during plate pasting, and ensure accurate overprint of printed matter.

PE foam closed cell layer: foam is the core of flexographic double-sided tape substrate. In order to achieve high-quality printing, the selection of foam must have three basic characteristics: foam structure, foam hardness and foam resilience, which will affect the performance of the tape respectively.

Open surface glue layer: opening the glue layer will determine the viscosity of the tape. At present, there is no unified standard for viscosity in the industry. Users can choose their own adhesive tape according to their own product characteristics.

Next, let's look at the classification of adhesive tape. According to different characteristics and properties, we can classify double-sided tapes from several aspects:

1、 Classification by tape thickness: common thicknesses are 0.38 and 0.5 mm. Here's one

The concept must be clear. The original (finished) thickness of the tape is 0.43 and

0.55mm, but when applied, the tape is subject to a certain imprinting effect, and the thickness is low when working

The actual is 0.38 and 0.5 mm. So we often say that the thickness of tape refers to the working thickness

Thickness. In addition to 0.38 and 0.5 mm, there are some tapes with special thickness

(e.g. 1.5mm), occasionally used.

2、 Classification by tape density: usually divided into high density, medium density and low density.

High density tape has high hardness and is usually suitable for large-area field layout

Improve the field printing effect, improve the coverage rate (reduce pinholes and white exposure). For exampleFor white backed prints, high-density tape will have better performance.Medium density tape is the tape with medium hardness and medium performance, which can not only meet the actual requirementsGround printing can also take into account dot printing, which is often used in practical Cao work.As the name suggests, low-density adhesive tape is low hardness tape. Its main function isPrinting dot layout can better restore dot and effectively avoid dot printingPaste version, block version and reduce the frequency of dirty version.In fact, in order to meet more and more diverse needs, the density classification of tape has been improvedFar more than these three, there are also different characteristics such as medium hard, medium soft and so onThe user can choose the tape according to the actual needs.