Base paper silicone oil for preventing label warping and its preparation method

Abstract

The present invention discloses a base paper silicone oil for preventing label warping, commercial silicone oil, and ultra-fine sodium bicarbonate powder. Beneficial effects: The present invention adopts a mixed suspension silicone oil, which includes commercial silicone oil and ultra-fine sodium bicarbonate powder in a suspension state. During label production and coating, the mixed suspension silicone oil is directly coated on the surface of the base paper. At the initial stage of high-temperature curing, the mixed suspension silicone oil on the surface quickly cures and locks water, and the fibers in the base paper begin to lose water. With the continuous high temperature, the ultra-fine sodium bicarbonate powder in the mixed suspension silicone oil decomposes to form water. Since the surface layer of the mixed suspension silicone oil has cured, the water transfers to the inside of the base paper, thereby replenishing the water lost by the base paper, directly moisturizing the base paper, avoiding excessive water loss of the base paper and resulting in water absorption and deformation in the later stage, thus fundamentally solving the problem of label warping, having a good problem of preventing label warping, and improving the yield rate.

Description

Technical Field

[0001] The present invention relates to the technical field of label production, and more specifically, to a base paper silicone oil for preventing label warping and a preparation method thereof. Background Art

[0002] Label paper is a reprocessed product of paper, also known as "self-adhesive". With the development of society, labels are becoming increasingly closely related to people's daily lives. Labels can be seen everywhere on daily used washing products, cosmetics, medicines, clothing, household appliances, etc. The production process of label paper is called "coating", that is, a layer of silicone oil is coated on the surface of the base paper, and then it is heated in a drying oven to cure the silicone oil at high temperature. The base paper coated with silicone oil enters the gluing station, and the glue is coated on the silicone oil layer of the base paper. The base paper passes through the oven again for drying to evaporate the moisture in the glue. Subsequently, the base paper and the face material enter the laminator at the same time, and the base paper and the face material are bonded together under the action of two laminating rollers, transferring the glue on the base paper to the face material, and finally winding it into a finished product.

[0003] After retrieval, it is found that in the article "Reasons and Solutions for Label Paper and Label Roll Warping" published in the magazine "China Packaging" with the journal number CN11 - 1168 / TB, it is proposed that the main reason for warping in the CD direction of the label is the difference in water content between the base paper and the face material. The base paper loses water during the heat curing of the silicone oil and the drying of the glue, forming a difference in water content with the face material. When placed in the air, the relatively dry base paper absorbs water and deforms, causing warping. The conventional solution is to use a humidifying device for humidification to supplement the water content of the base paper before bonding with the face material so that it no longer absorbs water and deforms later. However, this type of humidification method requires strict control of the humidification humidity and pressure, and the degree of water absorption of the base paper still cannot be manually controlled, and the water replenishment efficiency is not high, easily leading to the phenomenon of insufficient or excessive water replenishment. Moreover, the water vapor formed by humidification will also adhere to or even enter the glue, resulting in a change in the water content of the glue, affecting the subsequent bonding with the face material, thus affecting the label flatness, and the control of label warping is not good, and further improvement can be made.

[0004] In view of the problems in the related art, no effective solution has been proposed yet. Summary of the Invention

[0005] (I) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the present invention provides a base paper silicone oil for preventing label warping and a preparation method thereof, which have the advantages of preventing warping, simplifying the production process, and being convenient for production, thereby solving the problems in the above background art.

[0007] (II) Technical Solutions

[0008] To achieve the above advantages of preventing label warping, simplifying the production process, and facilitating production, the specific technical solutions adopted in the present invention are as follows:

[0009] The base paper silicone oil for preventing label warping includes commercial silicone oil and ultrafine sodium bicarbonate powder. The ultrafine sodium bicarbonate powder is obtained by ultrafine pulverization of commercial sodium bicarbonate, and the particle size of the ultrafine sodium bicarbonate powder is less than 0.01 mm. The commercial silicone oil and sodium bicarbonate powder are mixed by a homogenizer to form a mixed suspension silicone oil, and the mixed suspension silicone oil is used to coat the label base paper instead of the commercial silicone oil. The addition amount of the ultrafine sodium bicarbonate powder is 10 - 15 times the water loss of the base paper.

[0010] The preparation method of the base paper silicone oil for preventing label warping includes commercial silicone oil and ultrafine sodium bicarbonate powder. The specific steps are as follows:

[0011] S1. Preparation of ultrafine sodium bicarbonate powder: Take commercial sodium bicarbonate and add it to an ultrafine pulverizer to obtain ultrafine sodium bicarbonate powder with a particle size less than 0.01 mm, and store it in a container.

[0012] S2. Preparation of mixed suspension silicone oil: Take the ultrafine sodium bicarbonate powder prepared in S1 and enter it into a homogenizer through a powder feeder, and inject commercial silicone oil into the homogenizer together. Turn on the homogenizer for homogenization to obtain mixed suspension silicone oil.

[0013] S3. Storage of mixed suspension silicone oil: After S2 is completed, transfer the mixed suspension silicone oil to a container and store it at room temperature.

[0014] Furthermore, liquid nitrogen intensive cooling is required when the ultrafine pulverizer in S1 is working, and the liquid nitrogen intensive cooling includes a liquid nitrogen intensive cooling system.

[0015] Furthermore, the liquid ammonia intensive cooling system includes a liquid nitrogen storage tank, an axial flow fan, and a diversion pipeline. The axial flow fan is installed inside the diversion pipeline, and one end of the diversion pipeline is connected to the liquid nitrogen storage tank, and the other end is suspended above the feed inlet of the ultrafine pulverizer.

[0016] Furthermore, the containers mentioned in S1 and S3 are sealed moisture-proof tanks.

[0017] Furthermore, the homogenization time of the homogenizer is not less than 5 min and not more than 10 min.

[0018] Furthermore, the homogenizer is installed in a dry workshop, and the working humidity is not more than 10%.

[0019] Furthermore, the ultrafine pulverizer is installed in a dry workshop, and the working humidity is not more than 10%.

[0020] Furthermore, the working temperatures of S1, S2, and S3 are not more than 25 °C.

[0021] Furthermore, the purity of the commercial sodium bicarbonate is not less than 90%.

[0022] (III) Beneficial Effects

[0023] Compared with the prior art, the present invention provides a base paper silicone oil for preventing label warping and its preparation method, which has the following beneficial effects:

[0024] (1) The present invention adopts a mixed suspension silicone oil, which includes commercial silicone oil and ultrafine sodium bicarbonate powder in a suspended state. During the label production coating process, the mixed suspension silicone oil is directly coated on the surface of the base paper. In the initial stage of high-temperature curing, the mixed suspension silicone oil on the surface quickly cures and locks water, and the fibers in the base paper begin to lose water. With the continuous high temperature, the ultrafine sodium bicarbonate powder in the mixed suspension silicone oil decomposes to form water. Since the surface layer of the mixed suspension silicone oil has been cured, the water transfers to the inside of the base paper, thus replenishing the water lost by the base paper, directly moisturizing the base paper, avoiding excessive water loss of the base paper and resulting in water absorption and deformation in the later stage, and fundamentally solving the problem of label curling, having a good effect of preventing label warping and improving the yield rate.

[0025] (2) The present invention replenishes water to the base paper by the decomposition of the ultrafine sodium bicarbonate powder contained in the mixed suspension silicone oil at high temperature, avoiding the trouble of humidification and water replenishment in the later stage, simplifying the later label paper production process, simplifying the process, improving the production efficiency and the convenience of use. At the same time, it also avoids the influence of humidification on the glue and the problem of unstable bonding between the glue and the face material, further improving the yield rate.

[0026] (3) The present invention adopts an ultrafine pulverizer and a homogenizer, both of which are existing industrial equipment. There is no need to extensively modify the production equipment, it is simple to use and convenient to produce. Moreover, the commercial sodium bicarbonate is low in cost and small in addition amount, the total cost is significantly reduced, and the production method is simple and efficient. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 is a flowchart of a base paper silicone oil for preventing label warping and its preparation method according to an embodiment of the present invention. Detailed Embodiments

[0029] To further illustrate the embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0030] According to an embodiment of the present invention, there is provided a base paper silicone oil for preventing label warping and its preparation method.

[0031] Now, the present invention will be further described in conjunction with the accompanying drawings and specific implementation manners. As Figure 1 shown, the base paper silicone oil for preventing label warping according to an embodiment of the present invention includes commercial silicone oil and ultrafine sodium bicarbonate powder. The ultrafine sodium bicarbonate powder is obtained by ultrafine pulverization of commercial sodium bicarbonate, and the particle size of the ultrafine sodium bicarbonate powder is less than 0.01 mm, which does not affect the coating process, will not cause clogging, and is more easily decomposed by heat to form water. The commercial silicone oil and sodium bicarbonate powder are mixed by a homogenizer to form a mixed suspension silicone oil, and the mixed suspension silicone oil is used to coat the label base paper instead of the commercial silicone oil. The addition amount of the ultrafine sodium bicarbonate powder is 10 - 15 times the water loss of the base paper, and the water loss of the base paper is about 3% - 4%. Since each gram of sodium bicarbonate can decompose to produce 0.1 gram of water, it is necessary to supplement the ultrafine sodium bicarbonate powder with a weight of 10 - 15 times the water loss of the base paper to ensure the water supply.

[0032] The preparation method of the base paper silicone oil for preventing label warping includes commercial silicone oil and ultrafine sodium bicarbonate powder. The specific steps are as follows:

[0033] S1. Preparation of ultrafine sodium bicarbonate powder: Take commercial sodium bicarbonate and add it to an ultrafine pulverizer to obtain ultrafine sodium bicarbonate powder with a particle size less than 0.01 mm, and store it in a container. The ultrafine pulverizer can be purchased on the market.

[0034] S2. Preparation of mixed suspension silicone oil: Take the ultrafine sodium bicarbonate powder prepared in S1 and enter it into a homogenizer through a powder feeder, and inject commercial silicone oil into the homogenizer together. Turn on the homogenizer for homogenization to obtain a mixed suspension silicone oil. The homogenizer can be purchased on the market.

[0035] S3. Storage of mixed suspension silicone oil: After S2 is completed, transfer the mixed suspension silicone oil to a container for storage at room temperature. Sodium bicarbonate is insoluble in silicone oil, and the silicone oil isolates the outside air and water, so it can be stored at room temperature.

[0036] In one embodiment, liquid nitrogen intensive cooling is required when the ultrafine pulverizer in S1 is working, and the liquid nitrogen intensive cooling includes a liquid nitrogen intensive cooling system.

[0037] In one embodiment, the liquid ammonia intensive cooling system includes a liquid nitrogen storage tank, an axial flow fan, and a diversion pipeline. The axial flow fan is installed inside the diversion pipeline. One end of the diversion pipeline is connected to the liquid nitrogen storage tank, and the other end is suspended above the feed inlet of the ultrafine grinder. The low-temperature nitrogen gas generated by the volatilization of liquid nitrogen is transported by the axial flow fan along the diversion pipeline and the feed inlet of the ultrafine grinder into the ultrafine grinder, forcibly cooling the ultrafine grinder and commercial sodium bicarbonate, and preventing the premature decomposition of commercial sodium bicarbonate due to high temperature generated during pulverization.

[0038] In one embodiment, the containers mentioned in S1 and S3 are sealed moisture-proof tanks to prevent the ultrafine powder of sodium bicarbonate from deliquescing.

[0039] In one embodiment, the homogenization time of the homogenizer is not less than 5 min and not more than 10 min to avoid overmixing and insufficient homogenization.

[0040] In one embodiment, the homogenizer is installed in a dry workshop with a working humidity not greater than 10% to prevent moisture in the air from participating in homogenization and causing premature deliquescence of the ultrafine powder of sodium bicarbonate.

[0041] In one embodiment, the ultrafine grinder is installed in a dry workshop with a working humidity not greater than 10% to prevent moisture in the air from participating in pulverization and causing premature deliquescence of the ultrafine powder of sodium bicarbonate.

[0042] In one embodiment, the working temperatures of S1, S2, and S3 are not greater than 25 °C, which is a common working temperature.

[0043] In one embodiment, the purity of commercial sodium bicarbonate is not less than 90% to prevent excessive impurities from affecting the proportioning and weighing.

[0044] Working principle:

[0045] The mixed suspension silicone oil includes commercial silicone oil and ultrafine powder of sodium bicarbonate in a suspended state. During label production and coating, the mixed suspension silicone oil is directly coated on the surface of the base paper. In the initial stage of high-temperature curing, the mixed suspension silicone oil on the surface quickly cures and locks water, and the fibers in the base paper begin to lose water. As the high temperature continues, the ultrafine powder of sodium bicarbonate in the mixed suspension silicone oil decomposes to form water. Since the surface layer of the mixed suspension silicone oil has cured, the water transfers into the base paper, thus replenishing the water lost by the base paper, directly moisturizing the base paper, preventing the base paper from losing too much water and causing deformation due to water absorption later, fundamentally solving the problem of label curling, having a good problem of preventing label curling, and improving the yield rate.

[0046] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "setting", "connection", "fixation", "swivel connection" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Anti-label warping base paper silicone oil, It is characterized in that, It is composed of commercial silicone oil and ultra-fine sodium bicarbonate powder. The ultra-fine sodium bicarbonate powder is obtained by ultra-fine pulverization of commercial sodium bicarbonate, and the particle size of the ultra-fine sodium bicarbonate powder is less than 0.01 mm. The commercial silicone oil and the ultra-fine sodium bicarbonate powder are mixed by a homogenizer to form a mixed suspension silicone oil, and the mixed suspension silicone oil is used to coat the label base paper instead of the commercial silicone oil. The addition amount of the ultra-fine sodium bicarbonate powder is 10-15 times the water loss of the base paper, The anti-label warping base paper silicone oil is prepared by the following method: S1. Preparation of ultra-fine sodium bicarbonate powder: Take commercial sodium bicarbonate and add it to an ultra-fine pulverizer to obtain ultra-fine sodium bicarbonate powder with a particle size less than 0.01 mm, and store it in a container; S2. Preparation of mixed suspension silicone oil: Take the ultra-fine sodium bicarbonate powder prepared in S1 and enter it into a homogenizer through a powder feeder, and inject commercial silicone oil into the homogenizer together. Turn on the homogenizer for homogenization to obtain mixed suspension silicone oil; S3. Storage of mixed suspension silicone oil: After S2 is completed, transfer the mixed suspension silicone oil to a container and store it at room temperature; During the operation of the ultra-fine pulverizer in S1, liquid nitrogen strong cooling is carried out, and a liquid nitrogen strong cooling system is used for liquid nitrogen strong cooling; The containers mentioned in S1 and S3 are airtight and moisture-proof tanks; The homogenizer is installed in a dry workshop, and the working humidity is not more than 10%; The ultra-fine pulverizer is installed in a dry workshop, and the working humidity is not more than 10%; The working temperature of S1, S2 and S3 is not more than 25 °C.

2. A preparation method of the anti-label warping base paper silicone oil as claimed in claim 1, It is characterized in that, It is prepared by the following method: S1. Preparation of ultra-fine sodium bicarbonate powder: Take commercial sodium bicarbonate and add it to an ultra-fine pulverizer to obtain ultra-fine sodium bicarbonate powder with a particle size less than 0.01 mm, and store it in a container; S2. Preparation of mixed suspension silicone oil: Take the ultra-fine sodium bicarbonate powder prepared in S1 and enter it into a homogenizer through a powder feeder, and inject commercial silicone oil into the homogenizer together. Turn on the homogenizer for homogenization to obtain mixed suspension silicone oil; S3. Storage of mixed suspension silicone oil: After S2 is completed, transfer the mixed suspension silicone oil to a container and store it at room temperature; During the operation of the ultra-fine pulverizer in S1, liquid nitrogen strong cooling is carried out, and a liquid nitrogen strong cooling system is used for liquid nitrogen strong cooling; The containers mentioned in S1 and S3 are airtight and moisture-proof tanks; The homogenizer is installed in a dry workshop, and the working humidity is not more than 10%; The ultra-fine pulverizer is installed in a dry workshop, and the working humidity is not more than 10%; The working temperature of S1, S2 and S3 is not more than 25 °C.

3. According to the preparation method of the anti-label warping base paper silicone oil as claimed in claim 2, It is characterized in that, The liquid nitrogen strong cooling system includes a liquid nitrogen storage tank, an axial flow fan and a diversion pipeline, and the axial flow fan is installed inside the diversion pipeline, and one end of the diversion pipeline is connected to the liquid nitrogen storage tank, and the other end hangs above the feed inlet of the ultra-fine pulverizer.

4. According to the preparation method of the anti-label warping base paper silicone oil as claimed in claim 2, It is characterized in that, The homogenization time of the homogenizer is not less than 5 minutes and not more than 10 minutes.

5. The preparation method of the base paper silicone oil for preventing label warping according to claim 2, characterized in that, The purity of the commercial sodium bicarbonate is not less than 90%.

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