阅读说明：本技术 一种抗冻处理剂及其应用方法 (Anti-freezing treatment agent and application method thereof ) 是由 高继东 周松涛 于 2020-07-03 设计创作，主要内容包括：本发明提供了一种抗冻处理剂及其应用方法。本发明提供的抗冻处理剂,按质量百分比计,包括以下组分：甘油30～65％,抗冻肽0.2～0.6％,D-山梨糖醇1～3％、乙醇5～10％,余量为水。本发明技术方案通过添加抗冻肽改善食品包装纸在长期低温冷冻状态和/或温差变化较大的情况下的物理性质,使其维持良好的纸张性能,防止包装纸发生脆性变性而破裂,从而保证了包装内容物的品质稳定性。(The invention provides an anti-freezing treatment agent and an application method thereof. The antifreeze treating agent provided by the invention comprises the following components in percentage by mass: 30-65% of glycerol, 0.2-0.6% of antifreeze peptide, 1-3% of D-sorbitol, 5-10% of ethanol and the balance of water. According to the technical scheme, the antifreeze peptide is added to improve the physical properties of the food packaging paper under the condition of long-term low-temperature freezing state and/or large temperature difference change, so that the food packaging paper maintains good paper performance, and the packaging paper is prevented from being broken due to brittle degeneration, and the quality stability of the packaged contents is ensured.)

1. The antifreeze treatment agent is characterized by comprising the following components in percentage by mass:

30-65% of glycerol, 0.2-0.6% of antifreeze peptide, 1-3% of D-sorbitol, 5-10% of ethanol and the balance of water.

2. The antifreeze treatment of claim 1, wherein said antifreeze treatment comprises the following components in percent by mass:

50-65% of glycerol, 0.3-0.5% of antifreeze peptide, 1-2% of D-sorbitol, 5-8% of ethanol and the balance of water.

3. An application method of the antifreeze treating agent, which comprises the antifreeze treating agent as claimed in any one of claims 1 to 5, and is characterized in that the antifreeze treating agent is applied to the preparation of low-temperature frozen food outer packaging paper.

4. The use of the anti-freeze treatment agent according to claim 3, wherein the storage temperature of the low temperature frozen food outer wrapper is-0 to-40 ℃.

5. The method for applying the anti-freezing treatment agent as claimed in claim 3, wherein the preparation method of the low-temperature frozen food outer packaging paper comprises the following steps:

step (1): immersing a packaging paper base layer into the anti-freezing treatment agent through a winding roller at a speed of 100-150 m/min;

step (2): drying the paper substrate after drying, coating a gloss oil layer on the upper surface of the paper substrate, coating a wax layer on the lower surface of the paper substrate, and cutting to obtain the low-temperature frozen food outer packaging paper.

6. The method of claim 5, wherein the packaging paper substrate in step (1) comprises: one of long fiber enhanced leaf pulp base paper and broad leaf pulp base paper.

7. The method of claim 5, wherein the moisture content of the paper substrate after drying in step (2) is 6.5-7.5%.

Technical Field

The invention relates to the technical field of food packaging, in particular to an anti-freezing treatment agent and an application method thereof.

Background

The food package is a large household in the packaging industry, and accounts for about 70 percent of the whole packaging industry. The food wrapping paper is a packaging product which takes paper pulp and paper board as main raw materials, and the paper for packaging food needs to meet the requirements of no toxicity, oil resistance, water resistance, moisture resistance, sealing and the like and meet the food packaging safety requirement. The food wrapping paper has the basic requirements that the food wrapping paper is in direct contact with food and most of the wrapping paper is directly eaten by people, so that the food wrapping paper has the essential requirements of meeting the requirements of food sanitation and meeting the related technical standards according to different use requirements of the food wrapping paper.

Due to the introduction of the cold chain, on one hand, the preservation date of the low-temperature frozen products such as the frozen sucker is prolonged, and on the other hand, the preservation date of the low-temperature frozen products is prolonged, so that higher requirements are put on food packaging paper for packaging the low-temperature frozen products such as the frozen sucker. The stability of the food packaging paper is seriously influenced by the problem of the growth and recrystallization of ice crystals caused by the processes of low-temperature freezing, storage, transportation and freeze thawing of the food packaging paper, so that the food packaging paper needs to maintain good paper properties such as the water content and the mechanical strength of the packaging paper under the condition of long-term low-temperature conditions and/or large temperature difference change, and the food packaging paper is prevented from being subjected to brittle degeneration, so that the packaging paper is broken, and the quality of the packaging contents is influenced.

Disclosure of Invention

The invention mainly aims to provide an anti-freezing treatment agent and an application method thereof, and aims to solve the problem that the paper performance of food packaging paper is reduced under long-term low-temperature conditions and/or large temperature difference change.

In order to achieve the aim, the invention provides an antifreeze treatment agent which comprises the following components in percentage by mass:

30-65% of glycerol, 0.2-0.6% of antifreeze peptide, 1-3% of D-sorbitol, 5-10% of ethanol and the balance of water.

The sugar (alcohol) antifreeze mainly comprises disaccharide such as sucrose, sorbitol, trehalose and lactitol and alcohol compounds thereof, sugar alcohol indirectly plays an antifreeze role by changing the state and the property of internal bound water, and the action size of the sugar alcohol is related to hydroxyl coordination. Although sugar alcohols reduce the formation of ice crystal particles during refrigeration, temperature fluctuations during cold chain cause small ice crystals to recrystallize, and ice crystal particle enlargement also causes changes in the mechanical properties of the paper.

It should be noted that although the glycerin and the water can be mixed in any proportion, the glycerin can absorb water in humid air, and crystal blocks can be separated out when the glycerin is cooled for a long time, so that the invention needs to consider that the antifreeze does not have crystallization phenomenon under a low-temperature freezing state for a long time.

The technical scheme of the invention adopts the antifreeze peptide as the antifreeze additive, and the antifreeze peptide can be adsorbed on the surface of the ice crystal to restrict the growth of the ice crystal, inhibit the recrystallization of the ice crystal and change the form of the ice crystal. The antifreeze protein with specific amino acid length and structure in the antifreeze peptide can be combined with an ice layer through a hydrogen bond, and then the formation of ice crystals is inhibited through the synergy of hydrophobic interaction, so that the freezing point of the system can be reduced, namely the system is still kept from crystallization under the condition of increasing the addition amount of glycerol.

Preferably, the anti-freezing treatment agent comprises the following components in percentage by mass:

50-65% of glycerol, 0.3-0.5% of antifreeze peptide, 1-2% of D-sorbitol, 5-8% of ethanol and the balance of water.

Because glycerine self property is thick, when the proportion of addition is higher, the phenomenon that mobility reduces can appear, consequently, adjust the viscosity of antifreeze agent through adding right amount ethanol in the system in this application, reduce the viscosity of glycerine, increase the mobility of antifreeze agent to make its better entering and disperse in wrapping paper basic unit body, obtain good infiltration effect.

In order to achieve the purpose, the invention also provides an application method of the anti-freezing treatment agent, which comprises the anti-freezing treatment agent and is applied to preparing the outer packaging paper of the low-temperature frozen food.

Preferably, the storage temperature of the low-temperature frozen food outer packaging paper is-0 to-40 ℃.

Preferably, the preparation method of the low-temperature frozen food outer wrapper comprises the following steps:

step (1): immersing a packaging paper base layer into the anti-freezing treatment agent through a winding roller at a speed of 100-150 m/min;

step (2): drying the paper substrate after drying, coating a gloss oil layer on the upper surface of the paper substrate, coating a wax layer on the lower surface of the paper substrate, and cutting to obtain the low-temperature frozen food outer packaging paper.

Preferably, the wrapping paper base layer in step (1) comprises: one of long fiber enhanced leaf pulp base paper and broad leaf pulp base paper.

Preferably, the water content of the paper base layer after drying in the step (2) is 6.5-7.5%.

According to the technical scheme, on one hand, the antifreeze peptide is added to improve the physical properties of the food packaging paper under the condition of long-term low-temperature freezing state and/or large temperature difference change, so that the food packaging paper maintains good paper performance, and the packaging paper is prevented from being broken due to brittle denaturation, thereby ensuring the quality stability of the packaged contents. On the other hand, by increasing the proportion of the glycerol in the antifreeze agent, the glycerol has good water retention performance, so that the wrapping paper can maintain the self water content even if the temperature is changed or in a high-temperature environment, and the mechanical property of the paper is prevented from being reduced due to dehydration.

Detailed Description

The technical solutions in the embodiments of the present invention are described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.