Multi-coating long-acting thermo-sensitive paper

Abstract

The utility model relates to the technical field of thermo-sensitive paper, in particular to multi-coating long-acting thermo-sensitive paper, which comprises a base layer, a coating layer group is arranged on the base layer, a thermo-sensitive coating is arranged on the coating layer group, the coating layer group comprises a first bottom layer, a second bottom layer and a third bottom layer which are sequentially arranged on the base layer, a non-setting adhesive layer is arranged on the side, away from the coating layer set, of the base layer, a release paper layer is arranged on the side, away from the base layer, of the non-setting adhesive layer, base layer paper pits are filled with the first bottom layer, a smooth surface is provided, and non-setting adhesive micromolecule components obtained through permeation can be absorbed and adsorbed through the porous inorganic material; therefore, the protective property of the back surface of the thermo-sensitive paper is improved, the thermo-sensitive paper is favorably applied to adhesive coating compounding of non-setting adhesive, the long-term effect of the thermo-sensitive paper is ensured in the application, the second bottom layer further prevents non-setting adhesive micromolecule components from permeating, and the third bottom layer plays a heat insulation role and is favorable for improving the sensitivity of the heat-sensitive color development layer.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat sensitive paper technical field especially relates to a multi-coating long-acting heat sensitive paper. BACKGROUND

[0002] Heat sensitive paper has been widely used in people's daily life. Such as daily necessities and food labels, cash register receipts, POS bank card swipers, fax paper, logistics labels, etc. Supermarkets, especially express delivery, use a lot of adhesive heat sensitive paper (self-adhesive) labels. With the diversification of the use of heat sensitive paper, long-acting heat sensitive paper self-adhesive label requirements are increasing, and performance requirements are getting better and better.

[0003] The existing heat sensitive paper usually sets a waterproof layer to prevent mildew and deterioration in a humid environment, so that water cannot affect the entire release paper. For example, the Chinese patent No. CN222362311U discloses a "waterproof heat sensitive paper", which has a second waterproof layer to further improve the waterproof performance of the base paper. The wear-resistant layer not only improves the wear resistance of the heat sensitive paper, but also protects the second waterproof layer and prolongs the service life of the second waterproof layer. The first protective layer and the second waterproof layer are not easy to damage, which can improve the protective performance of the base paper and prevent the heat sensitive paper from being damaged during use, thereby prolonging the service life of the heat sensitive paper.

[0004] However, in actual use, small molecules in the self-adhesive component of heat sensitive paper, especially long-acting heat sensitive paper, have the opportunity to penetrate into the heat-sensitive color developing coating from the back, which makes the printing performance and storage performance of the heat sensitive paper deteriorate, and even the typical hot melt adhesive seeps oil and turns black. In practical applications, the label cannot identify the information on the label surface, which is mostly caused by the aging and decomposition of the self-adhesive, which causes the barcode and text to be blurred. UTILITY MODEL CONTENT

[0005] The utility model aims at solving the problem of small molecules in the self-adhesive component penetrating into the heat-sensitive color developing coating, which deteriorates the printing performance and storage performance of the heat sensitive paper, and proposes a multi-coating long-acting heat sensitive paper.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] A multi-coating long-acting heat sensitive paper is designed, which comprises a base layer, a coating layer group is arranged on the base layer, a heat sensitive coating layer is arranged on the coating layer group, the coating layer group comprises a first bottom layer, a second bottom layer and a third bottom layer arranged on the base layer in sequence, a self-adhesive layer is arranged on the side of the base layer away from the coating layer group, and a release paper layer is arranged on the side of the self-adhesive layer away from the base layer.

[0008] Further, a plurality of isolation strips are arranged on the side of the release paper layer away from the self-adhesive layer.

[0009] Further, the heat-sensitive coating is provided with a waterproof layer away from the coating layer group side, and the waterproof layer is provided with a protective layer away from the heat-sensitive coating side.

[0010] Further, the first bottom layer is a mixed coating layer of a porous inorganic pigment, a promoter and a binder mixed and then coated on the base layer.

[0011] Further, the second bottom layer is a dense protective film layer.

[0012] Further, the third bottom layer is a heat-insulating coating layer.

[0013] The multi-coating long-acting heat-sensitive paper has the beneficial effects that:

[0014] In the utility model, the first bottom layer fills the pits and depressions of the base layer paper, provides a smooth surface, and the multi-hole inorganic material can absorb and adsorb the small molecule components of the adhesive that permeate, thereby improving the protective property of the back of the heat-sensitive paper, which is conducive to the application of the heat-sensitive paper in adhesive coating and composite, and ensures the long-acting property of the heat-sensitive paper in the application. The second bottom layer further prevents the penetration of the small molecule components of the adhesive, and the third bottom layer plays a heat-insulating role, which is conducive to improving the sensitivity of the heat-sensitive color layer.

[0015] Secondly, in the utility model, the release paper layer is arranged to protect the adhesive layer, prevent the mutual adhesion between the heat-sensitive papers, and the isolation strip is arranged on the release paper layer to separate the heat-sensitive papers stacked up and down to form gaps, so that the heat-sensitive papers are not too tightly attached to each other to increase the difficulty of taking, and the single heat-sensitive paper is convenient to take and paste. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 The utility model provides a kind of multi-coating long-acting heat-sensitive paper structure schematic diagram;

[0017] Fig. 2 The utility model release paper layer structure schematic diagram.

[0018] In the drawing: 1, base layer;11, adhesive layer;2, coating layer group;21, first bottom layer;22, second bottom layer;23, third bottom layer;3, heat-sensitive coating;31, waterproof layer;32, protective layer;4, release paper layer;41, isolation strip. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0020] Refer to Figs. 1-2The utility model provides a multi-coating long-acting heat sensitive paper, including base layer 1, be provided with coating layer group 2 on base layer 1, be provided with heat sensitive coating 3 on coating layer group 2, coating layer group 2 includes first bottom layer 21, second bottom layer 22 and third bottom layer 23 that are arranged on base layer 1 in turn, the side of base layer 1 away from coating layer group 2 is provided with adhesive layer 11, the side of adhesive layer 11 away from base layer 1 is provided with release paper layer 4.

[0021] In the utility model, the first bottom layer 21 fills the pits and depressions of the base layer 1, provides a smooth surface, absorbs and adsorbs the small molecule components of the adhesive that permeate, thereby improving the protective property of the back of the heat sensitive paper, which is conducive to the application of the heat sensitive paper in adhesive coating and composite, and ensures the long-acting property of the heat sensitive paper in application.

[0022] Further, in the embodiment, a plurality of isolation strips 41 are arranged at intervals on the side of the release paper layer 4 away from the adhesive layer 11, the release paper layer 4 is arranged to protect the adhesive layer 11, prevents the heat sensitive papers from adhering to each other, and the isolation strips 41 are arranged on the release paper layer 4 to separate the heat sensitive papers stacked above and below to form gaps, which avoids the heat sensitive papers from being too tightly adhered to each other and increases the difficulty of taking the heat sensitive papers, and facilitates the taking of the single heat sensitive paper for pasting.

[0023] Further, in the embodiment, the heat sensitive coating 3 is provided with a waterproof layer 31 on the side away from the coating layer group 2, and the waterproof layer 31 is provided with a protective layer 32 on the side away from the heat sensitive coating 3, which avoids the influence of a humid environment on the heat sensitive paper and prolongs the service life of the heat sensitive paper in the humid environment.

[0024] It should be noted that, in the embodiment, the first bottom layer 21 is a mixed coating layer formed by uniformly coating a mixture of porous inorganic pigments, accelerators and adhesives on the base layer 1, the inorganic pigments are at least one of aluminum hydroxide, zinc oxide, zinc hydroxide, titanium dioxide, clay, talc, heavy calcium carbonate and silicon dioxide, and the amount is in the range of 50wt% to 80wt%, preferably 65wt% to 70wt%; the adhesives such as polyvinyl alcohol and modified resin thereof, starch and its derivatives, cellulose derivatives and water-soluble acrylic resin are used to bond the porous inorganic pigments and the adhesion accelerators to form a uniform coating layer, and the amount is generally in the range of 20wt% to 30wt%. The coating amount of the first bottom layer after drying is preferably 3 to 5g / m2, which is determined according to the roughness of the back of the paper.

[0025] Also, in the embodiment, the second bottom layer 22 is a dense protective film layer, which further prevents the penetration of the small molecular components of the aging adhesive, and the dry adhesion of the second bottom layer is in the range of 1.0±0.2 g / m2, which is optimized according to the test of the best effect of the back coating of vegetable oil after printing and color development. The second bottom layer 22 can be coated and dried to form a dense protective film layer by mixing 50±5 parts of a styrene-acrylic emulsion, 20±2 parts of polyvinyl alcohol, 8±2 parts of a crosslinking agent, 20±2 parts of water, and 1-3 parts of a leveling agent and defoaming agent mixture.

[0026] More specifically, in the embodiment, the third bottom layer 23 is a heat insulation coating layer, and the bottom layer components include a hollow material with high void ratio and a binder. The amount of the hollow material is in the range of 30wt%-40wt%, and the amount of the polyvinyl alcohol binder is in the range of 50wt%-70wt%. The amount of the binder is more preferably 58wt%-62wt%, and the dry adhesion of the third bottom layer is in the range of 1.5±0.5 g / m2, preferably 1.6 / m2.

[0027] In the description of the present specification, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the technical solutions of the present patent and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present patent application.

[0028] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present patent application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0029] In the present specification, unless specifically defined and limited otherwise, the terms "mounting", "connection", "connecting", "fixed", and the like should be construed broadly and, for example, can be a fixed connection, or a detachable connection, or integral; can be a mechanical connection, or an electrical connection; can be a direct connection, or an indirect connection through an intermediate medium; can be an internal connection of two elements, or an interaction relationship between two elements, unless specifically defined otherwise. For those skilled in the art, the specific meanings of the above terms in the present specification can be understood according to the specific circumstances.

[0030] In the present specification, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0031] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, those skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

Claims

1. A multi-coated long-lasting thermal paper, comprising a base layer (1), characterized in that, A coating layer group (2) is provided on the base layer (1), and a heat-sensitive coating layer (3) is provided on the coating layer group (2). The coating layer group (2) includes a first bottom layer (21), a second bottom layer (22) and a third bottom layer (23) sequentially disposed on the base layer (1). A self-adhesive layer (11) is provided on the side of the base layer (1) away from the coating layer group (2), and a release paper layer (4) is provided on the side of the self-adhesive layer (11) away from the base layer (1).

2. The multi-coated long-lasting thermal paper according to claim 1, characterized in that: The release paper layer (4) is provided with multiple isolation strips (41) at intervals on the side away from the self-adhesive layer (11).

3. The multi-coated long-lasting thermal paper according to claim 1, characterized in that: A waterproof layer (31) is provided on the side of the thermal coating (3) away from the coating layer group (2), and a protective layer (32) is provided on the side of the waterproof layer (31) away from the thermal coating (3).

4. The multi-coated long-lasting thermal paper according to claim 1, characterized in that: The first base layer (21) is a mixed coating of porous inorganic pigments, accelerators and binders, which is then applied evenly to the base layer (1).

5. The multi-coated long-lasting thermal paper according to claim 1, characterized in that: The second bottom layer (22) is a dense protective film layer.

6. The multi-coated long-lasting thermal paper according to claim 1, characterized in that: The third bottom layer (23) is a heat-insulating coating.

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