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Pad printing for glasses

Writer:JackySource:www.szrl.net Date:2013-07-30

                                               Pad printing for glasses
The reason why the printing for glasses adopt the method of pad printing is that printing pad could do the process of printing on the spherical and smooth products with spherical and smooth surface, while the laser printing will break the surface of glasses. Apart from that, in terms of cost, the price of laser printing machine is between 100-200 thousand yuan, while the price of pad printing machine is only around 15 thousand yuan, which has an big advantage. we should take the followings into consideration.
 

The selection of printing ink
The selection of printing ink occupies a very important position, which relates to the broad usage of pad printing. Because the spectacle frame is made of metal, which demand that the printing ink have a good adhesive force on the metal surface. The bi-component printing ink prevails nowadays and its drying method is usually stoving. The printing for glasses uses glass printing specialized ink, which is also bi-component and dried by stoving. The bi-component printing ink is featured with high hardness and good adhesive force when it gets cured, though its operation may be somewhat complex.
 

Printing pad
It is very crucial to select a appropriate printing pad. At first, the printing pad should printed in the designated spot of the product. Secondly, the printing pad need to be resilient enough in case of being deformed. Because the printing area of the spectacle frame is narrow, the printing pad should be somewhat cuspidal. According to experiment, A7 pad with the cross sectional area of 38mm² is appropriate.

Pad printing silicon of Hongye
 

Pad printing machine
Though printing area of spectacle frame is narrow, it is only used for the pattern of trademark, no complicated patterns involved. So selecting pad printing machine with monochrome and small size is just OK.
In the series of Hongye silicon rubber, there is printing pad silicone suitable for pad printing for glasses. please browse the following product performance parameter sheet:

 

 

 

Model

901

902

912

916

918

933

Color

white

white

white

white

white/

semitransparent

White/red

Vulcanization Type

Condensation

vulcanization

Condensation

vulcanization

Condensation

vulcanization

Condensation

vulcanization

Condensation

vulcanization

Addition cure vulcanization

Hardness( A°)

30±2

30±2

30±2

14±2

30±2

34±2

Mixing Ratio(A:B)

100:2-100:3

100:2-100:3

100:2-100:3

100:2-100:3

100:2-100:3

9:1

Viscosity(mPa)

32000±2000

35000±2000

32000±2000

36000±2000

33000±2000

18000±2000

Tensile Strengh (MPa)

3.8

4.0

4.0

3.5

4.2

3.0

Tear Strengh(kN/m)

22±2

24±2

25±2

25±2

27±2

8

Elongation(℅)

380

430

340

570

320

350

Operating Time(min)

30-40

30-40

30-40

30-40

30-40

10-20

Vulcanizing Time(h)

3-4

3-4

3-4

3-4

3-4

2-4

Linear Shrinkage(℅)

0.3

0.3

0.3

0.3

0.3

0.1

 

 

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TypeInfo: Other

Keywords for the information:pad printing for glasses  printing ink  printing pad  silicon rubber  pad printing machine