GB 27934.1-2011Lamination process control and testing methods for paper prints -- Part 1: General requirements (English PDF)

4.1 Requirements film

4.1.1 coated with a film appearance should be consistent with Table 1.

Table 1 film appearance requirements

Item appearance requirements Fisheye, crystal points (white dots) <=1.5mm2 Fold during use can be flattened Allowing a slight scratch Violent muscle adjacent protrusions and lows difference <=2µm Film roll end surface uniformity <=2.0mm Tightness of the film roll moving, sliding between the filmless production Joints per 1000m more than one, and the need to use colored tape to mark 4.1.2 that is coated film should meet the physical and mechanical properties in Table 2.

Table 2 film that is coated mechanical performance requirements

project

Biaxially oriented polypropylene (BOPP) film Light film matte film Biaxially oriented polyester (BOPET) Light film Wetting Tension/mN/m surface treatment >=38 >=38 >=48 Haze /% <=2.0 >=70 <=8.0 Tensile strength/MPa Longitudinal >=120 >=100 >=170 Transverse >=200 >=160 >=170 Heat shrinkage /% Portrait <=4.5 <=4.5 <=3.0 Lateral <=3.0 <=3.0 <=3.0 4.1.3 precoat physical and mechanical properties shall conform to Table 3.

Table 3 precoat physical and mechanical performance requirements

project

Biaxially oriented polypropylene (BOPP) laminating film Light film matte film Biaxially oriented polyester (BOPET) light precoat Wetting Tension mN/m Coated surface >=38 >=38 >=38 Haze <=5.0 70 ± 10 <=10.0 Tensile Strength MPa Portrait >=70 >=60 >=70 Transverse >=130 >=100 >=70 Heat shrinkage Portrait <=4.0 <=4.0 <=2.0 Lateral <=2.0 <=2.0 <=1.0

4.2 Adhesive environmental requirements

The total content of the adhesive 4.2.1 benzene, toluene, xylene, should be less than 1000mg/kg, wherein the benzene content should be less than 100mg/kg.

4.2.2 Adhesive halogenated hydrocarbon content should be less than 1000mg/kg.

4.3 Paper print requirements

4.3.1 surface clean and smooth.

4.3.2 print moisture and Film humidity and temperature to adapt.

4.3.3 printing ink layer should be sufficiently dry before coating.

4.3.4 printed ink film before wetting tension of not less than 38mN/m.

5.1 Coating bond strength

One of the following conditions, namely that the bond strength Qualified.

a) When the film and print release, most or all of the ink transferred to the surface of the plastic film.

b) coated products after processing comply with the requirements of the bond strength.

5.2 Appearance requirements

5.2.1 graphic clarity, the surface clean, smooth, no curl.

5.2.2 wrinkles, scratches, stripping, loss of membrane blistering.

5.3 Color film

CIELABdeltaE * ab value color four-color solid ink coating shall meet the requirements of Table 4.

Table 4 film after four-color solid ink color CIELABdeltaE * ab value

Film type black magenta Qinghuang Light film <=3.0 <=3.0 <=3.0 <=3.0 Matt film <=10.0 <=7.0 <=7.0 <=7.0

5.4 Stability requirements

In film after film to match the environment and conditions placed 24h or more, shall comply with the requirements of this section 5.1,5.2,5.3.

5.5 Process requirements

As for the surface coated products after processing requirements (such as stamping, UV coating, embossing, etc.) should be done before the film sample test, meet Only after mass production requirements.

6.1 Sample conditioning and testing of the standard environment

Environmental standards by GB/T 2918 and predetermined tolerance range, a temperature of (23 ± 2) °C, relative humidity of (50 ± 10)%, Conditioning time less than 4h, and in this condition the test.

6.2 Detection physical and mechanical properties of thin films

6.2.1 haze detection method performed in GB/T 2410 standard.

6.2.2 Detection of tensile strength accordance with GB/T 1040.3 standard. Test speed and sampling methods, BOPP film in accordance with GB/T 10003-2008 5.6 execution, BOPET film accordance with GB/T 16958-2008 in 6.5.1.

6.2.3 wetting tension detection method in accordance with the implementation of GB/T 14216 standard.

Heat shrinkage detection methods 6.2.4 BOPP film GB/T 10003-2008 in accordance with 5.7, BOPET film according to GB/T 16958-2008 in 6.5.2 executed.

6.3 Laminating film detection

6.3.1 Haze detection method

According to former GB/T 2410 standards, the samples need to be processed. Approach is. the width of the transverse direction of the film roll specimen in Transversely homogeneous sample sequentially on the subject and cut 120mm × 120mm square sample 5, will cut a good specimen suspended in a special order the bracket (see Figure 1) placed 120 °C ~ 123 °C (BOPP laminating film), 150 °C ~ 153 °C (BOPET laminating film) drying box, each Sample spacing 25mm ~ 30mm, put a piece of 300mm × 300mm insulation panels in the following sample, to prevent local heating. test when not blowing heat removal immediately after the 30s, cooling to ambient temperature detection test. Not contaminate the sample surface and adhesion.

Millimeters

1 bracket

6.3.2 Detection of thermal shrinkage

Length direction and the width direction of the film roll, respectively longitudinal and transverse specimens. On the subject sample and cut transversely uniform sequentially 120mm × 120mm square sample 5, sample to be positive, should be parallel to each side of the square, perpendicular to the longitudinal direction of the film roll, marking vertical and horizontal direction to, in the middle of the vertical and horizontal specimen mark of 100mm (see Fig. 2), the sample was ordered suspended on a special bracket (see Figure 1), placed in 120 °C ~ 123 °C (BOPP laminating film), 150 °C ~ 153 °C (BOPET laminating film) drying box, each sample interval 25mm ~ 30mm, in the following sample put a 300mm × 300mm insulation panels, to prevent local heating. When the test is not blowing, heating 30s after Immediately removed, after cooling to ambient temperature the test, the vertical and horizontal lengths of the measurement mark (accurate to 0.5mm). According to the following formula calculates the aspect to heat shrinkage, taking the arithmetic average of five samples.

T = (L-L1)/L × 100%

Where.

T --- heat shrinkage of the sample, expressed in%;

--- Before heating L of mark length of the line, in millimeters (mm);

After heating Ll --- mark length of a line, in millimeters (mm).

Millimeters

2 a schematic diagram of the sample mark

6.3.3 Other inspection items with 6.2.

6.4 Adhesive Detection

In accordance with the relevant content HJ/T 220-2005 Appendix A for testing.

6.5 Detection of paper print

Wetting tension on coated paper is detected before the ink layer printed accordance with GB/T 14216.

6.6 Coating product quality testing

6.6.1 Visual inspection

For testing in accordance with the provisions CY/T 3's.

6.6.2 Color detection film

Before and after the paper printed color film is measured according to GB/T 18722 in the requirements and methods.