阅读说明：本技术 一种对烟用原纸提高耐折度性能的前期改良工艺 (Early-stage improvement process for improving folding resistance of base paper for cigarettes ) 是由 朱小利 朱红艳 贾伟萍 刘冬 吴胜军 吴凯 褚玮 柳长红 陈思思 茹意 孙鹏 于 2019-10-25 设计创作，主要内容包括：本发明属于卷烟纸制备工艺技术领域,尤其涉及一种对烟用原纸提高耐折度性能的前期改良工艺。本发明通过配制耐折增强剂、涂覆粘结剂、涂覆耐折增强剂以及加热烘干定型的方式,达到对烟用原纸耐折性能有效提升的效果。本发明具有改良工艺简单有效,粘结剂加增强剂的组合形式效果好,烟用原纸耐折性能提升明显,以及涂覆层稳定性好、不易脱落的优点。(The invention belongs to the technical field of cigarette paper preparation processes, and particularly relates to an early-stage improvement process for improving folding resistance of base paper for cigarettes. The invention achieves the effect of effectively improving the folding resistance of the base paper for cigarettes by preparing the folding resistance reinforcing agent, coating the binder, coating the folding resistance reinforcing agent and heating, drying and shaping. The invention has the advantages of simple and effective improvement process, good combination form effect of the binder and the reinforcing agent, obvious improvement on the folding resistance of the base paper for the cigarettes, good stability of the coating layer and difficult falling.)

1. An early-stage improvement process for improving the folding endurance performance of base paper for cigarettes is characterized by sequentially comprising the following steps of:

s1, preparing a folding endurance reinforcing agent;

s2, coating the surface of the base paper for the cigarette and forming a bonding layer;

s3, coating the folding-resistant reinforcing agent on the surface of the bonding layer to obtain a semi-finished product paper;

s4, heating and drying the semi-finished paper to obtain the final base paper for the cigarette with improved folding endurance,

the folding-resistant reinforcing agent comprises glycerol, sorbitol, phthalate, polyvinyl acetate, hydroxypropyl methylcellulose and an auxiliary agent, and the bonding layer comprises vinyl acetate polymer, gelatin and chitin.

2. The earlier improvement process for improving folding endurance of base paper for cigarette as claimed in claim 1, wherein in step S1, the folding endurance enhancer comprises the following components by weight: 15-22 parts of glycerol, 5-7 parts of sorbitol, 0.5-1.5 parts of phthalate, 5-9 parts of polyvinyl acetate, 1-3 parts of hydroxypropyl methylcellulose and 1-7 parts of an auxiliary agent.

3. The previous improvement process for improving folding endurance of raw paper for cigarette according to claim 1 or 2, wherein in step S1, the auxiliary agent comprises the following components by weight: 15-20% of dimethyl sulfoxide, 45-55% of urea-formaldehyde resin and the rest of maleic anhydride graft polymer.

4. The earlier-stage improvement process for improving folding endurance of base paper for cigarettes according to claim 2, wherein in step S1, the preparation method of the folding endurance enhancer sequentially comprises the following steps:

s1, adding sorbitol, phthalate and polyvinyl acetate into a stirring kettle, heating to 65-68 ℃, stirring at the speed of 150-;

s2, adding glycerol and hydroxypropyl methylcellulose into the product obtained in the step S1, heating to 85-89 ℃, and keeping the temperature for 2-3 min;

and S3, cooling the product obtained in the step S2 to room temperature, adding the auxiliary agent at the stirring speed of 15-25r/min, and continuously stirring for 15-45min to obtain the final folding endurance enhancer.

5. The early-stage improvement process for improving the folding endurance performance of the base paper for cigarettes according to claim 1, which is characterized in that: in step S2, the weight of the chitin accounts for 55-75% of the total weight of the binder.

6. The early-stage improvement process for improving the folding endurance performance of the base paper for cigarettes according to claim 1, which is characterized in that: in step S2, the coating weight of the bonding layer is 1.5-2.2g/m²And in step S3, the coating weight of the folding endurance enhancing agent is 3.0-5.0g/m²。

7. The early-stage improvement process for improving the folding endurance performance of the base paper for cigarettes according to claim 1, which is characterized in that: in step S3, the folding endurance enhancer is coated at an ambient temperature of 28-32 ℃, an ambient humidity of 45-60% and a coating pressure of 2.5-2.8kg, and the folding endurance enhancer is coated within 5-8h after the adhesive layer is coated.

8. The early-stage improvement process for improving the folding endurance performance of the base paper for cigarettes according to claim 1, which is characterized in that: in step S4, the heating and drying operation is performed by medium-temperature preheating, high-temperature main drying, and low-temperature auxiliary drying.

9. The earlier stage improvement process for improving the folding endurance performance of the base paper for cigarettes according to claim 8, which is characterized in that: in step S4, the medium temperature preheating temperature is 85-89 ℃, and the duration time is 15-18 min; the temperature of the high-temperature main drying is 110-; the temperature of the low-temperature auxiliary drying is 60-62 ℃, and the duration time is 25-35 min.

10. The earlier stage improvement process for improving the folding endurance performance of the base paper for cigarettes according to claim 9, which is characterized in that: in step S4, the raw paper for cigarette is subjected to position switching operation in the medium-temperature preheating, high-temperature main drying and low-temperature auxiliary drying areas in a full-page rotation manner.

Technical Field

The invention belongs to the technical field of cigarette paper preparation processes, and particularly relates to an early-stage improvement process for improving folding resistance of base paper for cigarettes.

Background

The preparation process of the cigarette paper mainly comprises the steps of pretreatment of the base paper for the cigarette, coating of a functional coating, drying and shaping and subsequent conventional treatment, wherein additives are required to be coated on the base paper for the cigarette during pretreatment so as to improve the physical and chemical properties of the base paper for the cigarette. In the existing pretreatment step, an improved process for pertinently improving the folding endurance performance of the base paper for the cigarettes is lacked.

The Chinese patent with patent publication No. CN105586805A and publication No. 2016.05.18 discloses a preparation method of a folding endurance enhancer for paper, which comprises the following steps: 1. mixing starch, water, hydroxide, hypochlorite or persulfate and a cationic etherifying agent for reaction to prepare amphoteric starch; 2. mixing the resin and amphoteric starch, and reacting at 70-95 ℃ for 30-60 minutes; 3. and (3) mixing the product obtained in the step (2) with polyacrylamide, and reacting for 30-120 minutes at the temperature of 60-80 ℃ to obtain the folding endurance enhancer.

However, the folding endurance enhancer of the patent of the invention has a problem that the reinforcing effect is not obvious.

Disclosure of Invention

The invention aims to provide an early-stage improvement process for improving the folding resistance of base paper for cigarettes, which can achieve the effect of effectively improving the folding resistance of the base paper for cigarettes by preparing a folding resistance reinforcing agent, coating a binder, coating the folding resistance reinforcing agent and heating, drying and shaping. The invention has the advantages of simple and effective improvement process, good combination form effect of the binder and the reinforcing agent, obvious improvement on the folding resistance of the base paper for the cigarettes, good stability of the coating layer and difficult falling.

The technical scheme adopted by the invention for solving the problems is as follows: an early-stage improvement process for improving the folding endurance performance of base paper for cigarettes sequentially comprises the following steps:

s1, preparing a folding endurance reinforcing agent;

s2, coating the surface of the base paper for the cigarette and forming a bonding layer;

s3, coating the folding-resistant reinforcing agent on the surface of the bonding layer to obtain a semi-finished product paper;

s4, heating and drying the semi-finished paper to obtain the final base paper for the cigarette with improved folding endurance,

the folding-resistant reinforcing agent comprises glycerol, sorbitol, phthalate, polyvinyl acetate, hydroxypropyl methylcellulose and an auxiliary agent, and the bonding layer comprises vinyl acetate polymer, gelatin and chitin.

In the invention, the folding-resistant reinforcing agent ensures the effective folding-resistant performance improvement effect on the raw paper for cigarettes by a mode of mixing materials with plasticizing, dry strength, toughening and other performances in the components, and the binder of the bonding layer is used for assisting the coating and curing stability of the reinforcing agent coating to prevent the reinforcing agent coating from falling off easily.

In step S1, the folding endurance enhancer comprises the following components by weight: 15-22 parts of glycerol, 5-7 parts of sorbitol, 0.5-1.5 parts of phthalate, 5-9 parts of polyvinyl acetate, 1-3 parts of hydroxypropyl methylcellulose and 1-7 parts of an auxiliary agent.

In step S1, the further preferred technical solution is that the auxiliary agent includes the following components by weight: 15-20% of dimethyl sulfoxide, 45-55% of urea-formaldehyde resin and the rest of maleic anhydride graft polymer.

In a further preferred embodiment, in step S1, the method for preparing the folding endurance enhancer sequentially comprises the following steps:

s1, adding sorbitol, phthalate and polyvinyl acetate into a stirring kettle, heating to 65-68 ℃, stirring at the speed of 150-;

s2, adding glycerol and hydroxypropyl methylcellulose into the product obtained in the step S1, heating to 85-89 ℃, and keeping the temperature for 2-3 min;

and S3, cooling the product obtained in the step S2 to room temperature, adding the auxiliary agent at the stirring speed of 15-25r/min, and continuously stirring for 15-45min to obtain the final folding endurance enhancer.

In the invention, because of poor compatibility, the glycerol and the hydroxypropyl methylcellulose are added later, and the sorbitol, the phthalate and the polyvinyl acetate are used for ensuring that the mixing uniformity is further improved, and in addition, the addition of the auxiliary agent consisting of the dimethyl sulfoxide, the urea-formaldehyde resin and the maleic anhydride graft polymer is also used for improving the mixing compatibility of the main components of the folding and strengthening agent and ensuring that the mixing uniformity is stable.

The further preferred technical scheme is as follows: in step S2, the weight of the chitin accounts for 55-75% of the total weight of the binder.

The further preferred technical scheme is as follows: in step S2, the coating weight of the bonding layer is 1.5-2.2g/m²And in step S3, the coating weight of the folding endurance enhancing agent is 3.0-5.0g/m²。

The further preferred technical scheme is as follows: in step S3, the folding endurance enhancer is coated at an ambient temperature of 28-32 ℃, an ambient humidity of 45-60% and a coating pressure of 2.5-2.8kg, and the folding endurance enhancer is coated within 5-8h after the adhesive layer is coated.

The further preferred technical scheme is as follows: in step S4, the heating and drying operation is performed by medium-temperature preheating, high-temperature main drying, and low-temperature auxiliary drying.

The further preferred technical scheme is as follows: in step S4, the medium temperature preheating temperature is 85-89 ℃, and the duration time is 15-18 min; the temperature of the high-temperature main drying is 110-; the temperature of the low-temperature auxiliary drying is 60-62 ℃, and the duration time is 25-35 min.

The further preferred technical scheme is as follows: in step S4, the raw paper for cigarette is subjected to position switching operation in the medium-temperature preheating, high-temperature main drying and low-temperature auxiliary drying areas in a full-page rotation manner.

In the invention, the three-step heating and drying operation has the advantages of preheating paper at medium temperature, ensuring the basic curing operation of a bottom layer, performing high-temperature main drying and forming, ensuring the curing and forming effect of the main body in the reinforcing agent, and performing low-temperature auxiliary drying to consolidate the coating forming effect through relatively low temperature, thereby avoiding the problem of coating chapping caused by overheating.

The invention achieves the effect of effectively improving the folding resistance of the base paper for cigarettes by preparing the folding resistance reinforcing agent, coating the binder, coating the folding resistance reinforcing agent and heating, drying and shaping. The invention has the advantages of simple and effective improvement process, good combination form effect of the binder and the reinforcing agent, obvious improvement on the folding resistance of the base paper for the cigarettes, good stability of the coating layer and difficult falling.

Detailed Description

The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.