High-tearability CTP plate backing paper and preparation method thereof

A technology of tearing degree and backing paper, which is applied in the field of papermaking, can solve the problems affecting the formation of the wire part, damage, poor evenness of the backing paper, etc., and achieve the effect of improving the tearing degree and increasing the tearing degree in all directions

Active Publication Date: 2020-09-22
XIANHE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The starch reinforcing agent is used as a dry strengthening agent in the CTP plate liner, which can increase the tearing degree of the liner paper, but the problem of molecular chain entanglement or even flocculation is likely to occur due to the addition of too much starch reinforcing agent, which affects its function , it will also affect the subsequent wire forming, resulting in poor evenness of the prepared lining paper, so the amount of cationic starch added should not be too large, so the effect of enhancing the tearing degree of the lining paper is limited
The use of the CTP version of the backing paper has higher requirements for its tearing degree. The low tearing degree will not only cause the problem of paper breakage on the high-speed production line, affect the production efficiency, but also be easily damaged during transportation and use. The cracks will wear the photosensitive coating of the CTP plate

Method used

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  • High-tearability CTP plate backing paper and preparation method thereof
  • High-tearability CTP plate backing paper and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] A CTP plate backing paper, comprising the following raw materials: coniferous wood pulp, hardwood pulp, serinol-methyl acrylate-bis(2-hydroxyethyl)amino(trimethylol)methane copolymer, vinyl acetic acid; The mass ratio of described coniferous wood pulp and hardwood pulp is 5:1; The addition amount of described serinol-methyl acrylate-bis(2-hydroxyethyl)amino(trimethylol)methane copolymer is 2.0% of the total dry weight of leaf wood pulp and hardwood pulp; the addition of the vinyl acetic acid is 0.5% of the total dry weight of softwood pulp and hardwood pulp.

[0063] Prepare the above-mentioned CTP plate backing paper by the following steps:

[0064] (1) Preparation of serinol-methyl acrylate-bis(2-hydroxyethyl)amino(trimethylol)methane copolymer:

[0065] (1.1) Under nitrogen protection and a temperature of 25° C., a mixed solution of methyl acrylate and methanol was added dropwise to a methanol solution of serinol, and reacted for 4 hours; then methanol and unreacted...

Embodiment 2

[0077] A CTP plate backing paper, comprising the following raw materials: coniferous wood pulp, hardwood pulp, serinol-methyl acrylate-bis(2-hydroxyethyl)amino(trimethylol)methane copolymer, vinyl acetic acid; The mass ratio of described coniferous wood pulp and hardwood pulp is 6.5:1; The addition amount of described serinol-methyl acrylate-bis(2-hydroxyethyl)amino(trimethylol)methane copolymer is 2.3% of the total dry weight of leaf wood pulp and hardwood pulp; the addition of the vinyl acetic acid is 0.6% of the total dry weight of softwood pulp and hardwood pulp.

[0078] Prepare the above-mentioned CTP plate backing paper by the following steps:

[0079] (1) Preparation of serinol-methyl acrylate-bis(2-hydroxyethyl)amino(trimethylol)methane copolymer:

[0080](1.1) Under nitrogen protection and a temperature of 27°C, add the mixed solution of methyl acrylate and methanol dropwise to the methanol solution of serinol and react for 3.5 hours; then distill under reduced pres...

Embodiment 3

[0092] A CTP plate backing paper, comprising the following raw materials: coniferous wood pulp, hardwood pulp, serinol-methyl acrylate-bis(2-hydroxyethyl)amino(trimethylol)methane copolymer, vinyl acetic acid; The mass ratio of described coniferous wood pulp and hardwood pulp is 8:1; The addition amount of described serinol-methyl acrylate-bis(2-hydroxyethyl)amino(trimethylol)methane copolymer is 2.5% of the total dry weight of leaf wood pulp and hardwood pulp; the addition of the vinyl acetic acid is 0.8% of the total dry weight of softwood pulp and hardwood pulp.

[0093] Prepare the above-mentioned CTP plate backing paper by the following steps:

[0094] (1) Preparation of serinol-methyl acrylate-bis(2-hydroxyethyl)amino(trimethylol)methane copolymer:

[0095] (1.1) Under nitrogen protection and a temperature of 30° C., a mixed solution of methyl acrylate and methanol was added dropwise to a methanol solution of serinol, and reacted for 3 h; then methanol and unreacted met...

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Abstract

The invention relates to the technical field of papermaking, and discloses high-tearability CTP plate backing paper and a preparation method thereof. The CTP plate backing paper is prepared from the following raw materials: softwood pulp, hardwood pulp, serinol-methyl acrylate-bis(2-hydroxyethyl)amino(trismethylol)methane copolymer and vinylacetic acid, wherein the mass ratio of the softwood pulpto the hardwood pulp is 5-8: 1; the dosage of the serinol-methyl acrylate-bis(2-hydroxyethyl)amino(trismethylol)methane copolymer is 2.0-2.5% of the total dry weight of the softwood pulp and the hardwood pulp; the dosage of the vinylacetic acid is 0.5-0.8% of the total dry weight of the softwood pulp and the hardwood pulp. According to the CTP backing paper, the serinol-methyl acrylate-bis(2-hydroxyethyl)amino(trismethylol)methane copolymer is added into the CTP backing paper, and the surface of the CTP backing paper is grafted with the vinylacetic acid, so that the tearing strength in all directions is effectively improved.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a high-tear CTP plate backing paper and a preparation method thereof. Background technique [0002] Computer to plate (CTP) technology refers to the direct imaging of digital pages in a computer system to a printing plate through an imaging device independent of a printing press (ie, a direct plate-making machine). This technology marks the complete digitalization of the pre-press workflow. It does not require complex operations such as imposition, copying, and printing, nor does it need to use silver salt photosensitive film and corresponding equipment and consumables, which greatly improves the efficiency and quality of plate making and saves The human resources in the corresponding links have lower comprehensive costs and can produce higher economic benefits. In the CTP system, the CTP plate is an extremely important component of the system, and it is the basis for ensuri...

Claims

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Application Information

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IPC IPC(8): D21H11/00D21H17/06D21H17/14D21H17/53D21H17/67C08G63/685C08G63/91C08J7/18
CPCD21H11/00D21H17/675D21H17/06D21H17/14D21H17/53C08G63/91C08G63/685C08J7/18C08J2301/02
Inventor 董金雨毛学米王义兵郑慧娟于振中杨奎占
Owner XIANHE CO LTD
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