The Production Requirements of Positive Thermal CTP Plate
The production process of the Positive thermal CTP plate is not much different from the PS version, but there are many differences between pieces and quality requirements in the specific process strip.
(1) The request for the roughness of the sand of the Positive thermal CTP
A positive thermal CTP plate requires meticulous and uniform sand. When the tape is used, the screen resolution is generally under 175LPI, and when the CTP version is made, its output resolution can reach 1000 to 4000dpi (output resolution: network screen resolution 14: 1). The roughness of the sandy mandarin affects the quality of the imaging. The roughness (RA value) of the Positive thermal CTP plate, already has industry standards. The H [IRA value is 0.4 to 0.6 m. Two different versions of the roughness of the sand are made the PS plate and the Positive thermal CTP version. Different exposure methods will have different results. The sandy eyes of the base are one of the key indicators that affect the quality of the CTP version.
(2) The request for the aluminum plate of the heating ctp of Positive
Positive thermal CTP plate has higher requirements than aluminum plates. Because the exposure parameters during laser scanning are all set. If there are many surface defects on the version of the base, the energy obtained when exposure will be uneven, resulting in unqualified quality of the layout; The requirements of the aluminum plates, black and white stripes, and grain size are also stricter than PS vessels; in addition, the roughness of the basic body of the aluminum plate is also large for the production of Positive thermal CTP plate. The influence, the RA value of some aluminum plates have reached 0-3 ITI, in this aluminum to make the RA value on the plate base of only 0.4 to 0.6 ITI, its uniformity will definitely be worse. Therefore, the RA value of the aluminum base for producing the thermal CTP of the yang map is best not to exceed 0 .25m.
(3) The requirements of the Positive thermal CTP version of the sensitive light layer
The sensitivity of the photosensitive layer to thermal energy is an important indicator for examining the quality of Positive thermal CTP. The higher the sensitivity CTP version of the Positive, the smaller the energy required when making the version. More prints. Although the HG / T3804-2005 Positive thermal CTP plate material is required to be 120 ~ 150mj / cm, in fact, its sensitivity should it's better to be higher. The light layer thickness of the Positive thermal CTP version is also different from the PS version. The technology of Positive thermal CTP $ 1 does not require film technology, and the restoration of the outlets can reach L % to 99 %, and the outlets are more real. Practice explanation The light layer is slightly thinner for the formation of Positive thermal CTP layout outlets, so the requirements of HG / T3804-2005 Positive thermal CTP layer for the quality of the unit area of the sensitive layer are (1.40 ± 0. 2O) G / m, while the quality of the unit area of the PS layout light layer is 1.6 ～ 2.5g / m.
(4) Special requirements of Positive thermal CTP layout for post-base processing
When manufacturing Positive thermal CTP conversion materials, the plates need to be seized with the base. Therefore, the Positive thermal CTP plate will be greatly improved in terms of resolution, printing resistance, and other properties. For example, in order to improve the performance of the thermal CTP layout of the Positive, it is often applied to a special bottom layer under its sensitivity to ensure that the thermal CTP plate in Positive can smoothly complete the exposure and development operations.
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