Comparison of Performance of Several Laser Photographic Films at Home and Abroad

First, the domestic laser photo film factory recommended performance

Laser photo-discharge film and other photosensitive materials, photographic performance mainly refers to the fog density, gamma, sensitivity and the highest density. Due to the differences in the test methods of the plants, these recommended performances are for reference only (see Table 1).

Table 1 Recommended Performance of Domestic Laser Photographic Tablets

Second, several domestic and foreign laser photo film performance test

1. Photographic performance test

In order to compare the performance of several laser photolithography films at home and abroad, we used the following conditions to test the photographic performance of the three films. The processing technology is shown in Table 2.

Exposure conditions: color temperature 2859°K

Color filter: Kodak Leiden 29

Exposure time: 1/50 second

Table 2 Processing technology

The photographic properties of the three films measured by the above method are shown in Table 3. Their characteristic curves are shown in Figure 1.

Figure 1 Characteristic Curves of Three Films

Table 3 Measured photographic performance of several laser photolithography films

The above related data was obtained after testing according to the methods prescribed by industry standards. The flushing method is manual. In the practical use of laser photolithography, most users use machine washing. Our factory had asked the user to rinse the machine with the Shanghai brand HN laser photo-discharge film and then measured its photographic performance. See Table 4 for data.

Table 4 Machine wash performance of Shanghai brand HN laser photo

According to our measured photographic performance, we have the following conclusions:

1 The photographic performance of Huaguang Brand and Shanghai Brand is basically the same, while the sensitivity of Shanghai Brand is fast. This is beneficial to the user. According to the concept of film sensitivity, the faster the sensitivity, the less exposure is required to produce the same density. Under our testing conditions, the Shanghai brand can reduce the exposure by 70% compared to the Huaguang brand, while the Fujifilm brand has 2 times more exposure than the Shanghai film.

2 The gamma of the three types of film is highest in Fujifilm. The higher the gamma ratio, the greater the ability of the film to record contrast between light and shade. As for the comparison between light and shade, the difference between large and bright looks bright, commonly known as the tone is hard. For printed films, the higher the contrast, the better.

3 The fog density of the three films is basically the same. Fog density refers to the density of the film that is produced by exposure without exposure. In the process of preparation or processing of various photosensitive materials, a certain amount of silver halide grains are more or less always generated silver dots, and are reduced to silver without exposure, so that after the development, there are different degrees of fog. Film fog conference affects sharpness.

The fog of these three films is now within the standard. In this regard, their quality is the same.

4 The highest density of two kinds of domestic films has exceeded 4.0, and the density of Fujifilm is also close to 4.0. Since they do not require such a high density in actual use, they all meet the requirements for use.

2. Physical and chemical performance test

For laser photolithography, the closely related physical and chemical properties mainly refer to the resolution force, the color sensing range and the coating thickness. In addition, the silver content of the film is also useful to users, and we also tested it. The physicochemical properties of the three films are shown in Table 5, and the photosensitivity spectra are shown in Figure 2, Figure 3 and Figure 4, respectively.

Table 5 Physicochemical properties of several laser photolithography films

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