CTP aluminum substrate | PS aluminum substrate-Henan Mingtai AL. Industrial Co., Ltd.

What is Aluminum CTP sustrate?

CTP technology is mainly used in the digital printing industry. Generally speaking, CTP contains four meanings:

Computer to plate:directly from the computer to the printing plate, that is, offline direct plate making. Originally developed by photographic direct plate, all computer controlled laser scanning images were developed, but printed by developing, fixing, and other processes. This technique eliminates the medium of film, which transforms text and images into numbers, and reduces the quality loss and material loss in the intermediate process. Usually, CTP is this type.

Computer to Press:directly from computer to printing machine, that is, machine direct plate making. The computer controlled laser beam outputs the graphic information directly to the printing plate, and the printing plate is mounted on the cylinder. This kind of printing plate can only be used once, and the graphic information can be recorded.

The Computer to Paper/Print:computer goes directly to paper or printing, that is, direct printing technology.

Computer to Proof:a computer direct proofs, namely color digital proofing.

Specification of PS CTP Aluminum Substrate:

PS CTP sheet metal with aluminium substrate including quantitative indicators of aluminium substrate chemical composition, temperature and baking plate mechanical properties, thickness and width accuracy, surface roughness of aluminum substrate, burr and plate, these indexes in different degrees in relation to the PS CTP Substrate and board material production quantity.

Chemical composition of PS CTP Substrate:

The CTP board base uses the aluminum plate base alloy has 1050, 1060, 1070 and so on, at present the most commonly used is 1050 alloy, its chemical composition standard follows:

Alloy		Al	Si	Fe	Cu	Mn	Mg	Cr	Zn	Ti	The others
1050	Min	99.5	0.05	0.2
1050	Max		0.2	0.4	0.03	0.03	0.03	0.05	0.02	0.03	0.03
1060	Min	99.6
1060	Max		0.25	0.35	0.03	0.03	0.03		0.05	0.03	0.03
1070	Min	99.7
1070	Max		0.20	0.25	0.03	0.03	0.03		0.07	0.03	0.03

PS CTP board of the electrolytic sand to be more detailed and uniform, two factors are very important:

1. the internal components of PS CTP Substrate, that is, with the production of CTP board of the aluminum alloy containing trace metal elements and the content of the species. The market is the best use of PS CTP Substrate on 1050, added mass percentage of 0.15%--0.3% active elements magnesium, special metal content after adjusting the proportion of the more reasonable, the PS CTP Substrate has good mechanical properties and can significantly improve the electrolytic adaptability, improve the response sensitivity of sand to electrolysis no, strengthening treatment can form a fine layer of uniform sand.

2.The process control of the aluminum alloy base processing project, the special metal elements added are more evenly distributed in the aluminum body, so as to make the electrolytic sand fine and uniform. In this regard, the CTP board of the aluminum plate used for hot rolling of square ingot, first homogenization heat treatment.

The quality tracking of the chemical composition of the aluminum PS CTP Substrate is one of the important parameters to ensure the quality of the raw material. The common test method is the correction curve method of ICP atomic emission spectrometry.

Physical and mechanical properties of PS CTP Aluminum Substrate

CTP plates are available manually, semi automatically, fully automatic, and automatic positioning and punching devices, which require a certain stiffness of the plate. If the plate base is too soft and the stiffness is poor, it is easy to bend and affect the use of the upper plate. The PS CTP Aluminum Substrate is too hard and it is not easy to be leveled. Therefore, the aluminum plate used in the CTP plate must have good mechanical properties.

Alloy Temper	Direction	Room Temperature			Baking Temperature (280℃,4min)			Baking Temperature (280℃,10min)
Alloy Temper	Direction	Yield Strength Rp 0.2 (Mpa)	Tention Strength	Elongation A50%	Yield Strength Rp 0.2 (Mpa)	Tention Strength Rp 0.2 (Mpa)	Elongation A50%	Yield Strength Rp 0.2 (Mpa)	Tention Strength Rp 0.2 (Mpa)	Elongation A50%
				Rp 0.2 (Mpa)
1A25 H18	Horizontal	150-190	170-205	2.0-2.5	130-178	140-190	2.0-3.0	154	163	2.7
1A25 H18	longitudinal	155-205	170-205	1.5-5.5	140-170	160-180	2.0-4.0	148	1544	2.7
1060 H18	Horizontal	160-190	170-200	2.5-3.0	130-135	140-150	2.0-2.5	150	164	2.2
1060 H18	longitudinal	170-195	180-200	2.5-3.0	130-145	145-150	2.5-3.0	145	162	2.7
1050 H18	Horizontal	170-190	180-205	2.0-2.5	165-180	170-190	3.0-3.5	166	185	2.7
1050 H18	longitudinal	170-180	180-190	2.0-2.5	145-165	150-180	3.0-3.5	162	170	3.2

Geometric properties of PS CTP Aluminum Substrate

The main indexes of the geometric properties of the aluminum sheet base are the width, thickness, ratio, arrogance, roughness and edge burr of the plate base, and the specific control range is shown in the table:

Width/mm		Thickness/mm		Roughness
Size	400--1030	1031---1650	≤0.35	0.35	Frant	Both sides
Tolerance	±0.3	±0.5	±0.005	±0.007	±0.2±0.1	≤20

At present, there are two main types of PS CTP plate making machine market, which are drum type laser scanning method, plate making process and inner drum laser scanning method. The outer drum laser scanning method is to make the plate fixed outside the roller, when making plate with the drum at the same time high speed rotating, heat sensitive CTP board is used outside drum laser scanning way plate making. The inner drum laser scanning method is to place the plate on the inside of the drum. When the plate is made, the plate is stationary and the laser head is scanned at high speed. The laser CTP plate making machine adopts the inner drum laser scanning method. Plate making mechanism version of the speed, cut automatic version, automatic positioning, drilling, so the CTP board of the geometric requirements are very strict. Therefore, the dimensional quality of the aluminum base must be ensured, including the thickness of the plate base, the width of the aluminum roll and the uniformity of the plate base.

The thickness of the aluminum sheet used for CTP plates is commonly found in 0.15mm, 0.30mm, 0.40mm, and the thickness of 0.20mm and 0.24mm is the most used in japan. The control range of thickness is generally divided into two steps, namely a thickness of less than or equal to 0.35mm, the range of error allowed is +/-0.005mm; the thickness is more than 0.35mm, the range of error allowed is +/-0.0075mm, the longitudinal and transverse thickness tolerance and aluminium substrate should be less than or equal to +/-0.005mm. is the most commonly used 0.275mm. thick aluminum plate base plate, the stiffness will be better that is not easy to crease. But in order to reduce costs, the thickness of the aluminum sheet base will be controlled at the lower limit of the index.
The CTP board on board width, length and squareness of requirements is very high, because it directly affects the use of the customer, if the size deviation is too large, on the one hand, will lead to unacceptable and rejected platemaker; on the other hand, the effect of color, blurred print patterns. In addition, from the cost considerations, China plate production and some do not install the on-line cutting plate device, so the width tolerance less than +/-0.5mm aluminum coil, the best without tolerance, in order to avoid online piece adjusting and cutting edges are not allowed to question.

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CTP/ PS aluminum substrate