Rubbing paper

Abstract

The rubbing paper comprises a matte film layer and a self-developing paper layer, developing microcapsules are arranged on the self-developing paper layer, the developing microcapsules are broken along with pressing and enable pigment wrapped in the developing microcapsules to be left on the self-developing paper layer, an adhesive layer is arranged between the matte film layer and the self-developing paper layer, and the rubbing paper further comprises an isolation layer, the isolation layer is located between the self-developing paper layer and the adhesive layer and used for isolating the self-developing paper layer from the adhesive layer, and the isolation layer and the matte film layer are connected through the adhesive layer. The utility model has the beneficial effects that the isolation layer is arranged between the self-developing paper layer and the adhesive layer, so that a physical isolation effect is realized, chemical components (such as an adhesive or a solvent) in the adhesive layer are effectively prevented from chemically reacting with pigments on the self-developing paper layer, and the problems of blurring and fading caused by degradation or color fading of the pigments are avoided.

Description

Technical Field

[0001] This utility model relates to a transfer material, and more particularly to a printing paper. Background Technology

[0002] Carbon copy paper, also known as carbonless copy paper, is widely used in commercial, legal, and everyday office settings, such as when filling out invoices, contracts, receipts, or forms, where multiple copies of the same content need to be generated quickly. Typical applications include express delivery slips, invoices, and bank documents. Users simply apply pressure to the upper writing paper, and the carbon copy paper is placed between the upper and lower receiving papers. Pen pressure causes the microcapsules in the self-developing paper to rupture, releasing a developer that reacts with the lower paper to form a visible trace, achieving carbonless copying. This process requires no external toner and is simple and efficient, making it particularly suitable for batch processing. Traditional carbon copy paper consists of a matte film, an adhesive layer, and a self-developing paper, bonded together using a lamination process to ensure even pressure distribution during printing, preventing tearing and ensuring clear color development. However, despite its convenience, existing manufacturing processes have an inherent drawback: the paper is prone to fading.

[0003] In existing technologies, the adhesive layer between the matte film and the developing paper (whether pre-coated on the developing paper or added later) is bonded through a lamination process. However, after the printing process, the adhesive layer reacts chemically with the ruptured developing capsule, causing the printed traces to gradually become blurred and difficult to identify over time. This fading problem severely affects the readability and durability of the carbon copies. Users often face the problem of fading records, making long-term preservation impossible, increasing the risk of errors and the burden of rework. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a rubbing paper that can slow down the fading speed of rubbings.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a printing paper comprising a matte film layer and a self-developing paper layer, wherein color-developing microcapsules are arranged on the self-developing paper layer and the color-developing microcapsules rupture upon pressure, leaving the pigment encapsulated inside on the self-developing paper layer; an adhesive layer is disposed between the matte film layer and the self-developing paper layer; and an insulating layer is also provided, wherein the insulating layer is located between the self-developing paper layer and the adhesive layer and is used to isolate the self-developing paper layer and the adhesive layer; the insulating layer and the matte film layer are connected by the adhesive layer.

[0006] The beneficial effects of this invention are as follows: By setting an insulating layer between the self-developing paper layer and the adhesive layer, a physical isolation effect is achieved, effectively preventing chemical components in the adhesive layer (such as adhesives or solvents) from reacting with the pigments on the self-developing paper layer, thereby avoiding the problem of blurred or faded traces caused by pigment degradation or fading. This not only improves the clarity and durability of the printed image but also ensures that the color vibrancy is maintained for a long time, making it suitable for repeated pressing applications. At the same time, this structure simplifies the interlayer bonding process, reduces complex processes in production, and helps improve the overall reliability and service life of the product. As a preferred method, the insulating layer can be made of thermoplastic polymer material (e.g., formed into a continuous film through a coating process). This film covers the surface of the self-developing paper layer, is uniform in thickness and dense, and can block the penetration of the adhesive layer. The working principle is that when the adhesive layer is applied, the insulating layer acts as a barrier to prevent chemical substances from migrating to the pigment area, so that the pigment remains only on the self-developing paper layer during the pressing process, avoiding reaction interference.

[0007] Furthermore, the insulating layer is formed by spraying plastic particles onto the self-developing paper layer through a coating process after hot melting.

[0008] The beneficial effects of this technical solution are as follows: the coating spraying process enables the barrier layer to form a uniform and continuous film covering the surface of the self-developing paper layer, avoiding local defects or gaps, thereby ensuring a stable and reliable barrier effect. This improves production efficiency and consistency while reducing material waste, because the coating process allows for precise control of thickness and distribution, preventing the risk of reaction caused by contact between the adhesive layer and pigments. Furthermore, this process is easy to scale up, helping to reduce the impact of environmental factors (such as humidity) on barrier performance, ensuring that the printing paper maintains high performance during storage and use. As a preferred method, plastic particles are sprayed through a high-pressure nozzle in a molten state to form a micron-sized film. The working principle is based on the rapid cooling and solidification of molten plastic to form a dense barrier layer, which can effectively block the diffusion of adhesive components; at the same time, the spraying angle and speed are adjustable to achieve full coverage of the self-developing paper layer surface, avoiding edge leakage problems.

[0009] Furthermore, the plastic particles are made of polyethylene resin.

[0010] Furthermore, the plastic particles are made of low-density polyethylene resin.

[0011] The beneficial effects of this technical solution are as follows: Polyethylene resin (LDPE resin can be selected) has excellent flexibility, chemical inertness, and thermal stability, which can effectively resist the erosion of common chemicals in the adhesive layer (such as solvents or plasticizers), thereby strengthening the protective effect of the barrier layer. This avoids the deterioration of pigments due to chemical reactions, ensuring that the printed marks are long-lasting and vibrant; at the same time, the low-temperature processing performance of LDPE polyethylene resin reduces production energy consumption, reduces thermal stress damage to the self-developing paper layer, and improves the overall product's durability and environmental adaptability. As a preferred approach, LDPE polyethylene resin achieves high barrier properties through molecular chain structure design (such as linear low-density variants). The working principle lies in its non-polar properties forming a tight network that blocks the penetration of polar solvents; simultaneously, the addition of antioxidants to the resin enhances stability, ensuring that no degradation occurs during the coating process and maintaining the integrity of the barrier layer. Another preferred approach is to select LDPE particles with a specific melt index (e.g., 2-10 g / 10 min). This index controls the melt flowability, forming a uniform film during coating spraying and avoiding bubbles or cracks. The working principle is based on the crystallization behavior of the melt during cooling, forming a continuous barrier layer.

[0012] Furthermore, the coating spraying rate is 12-15 g / ㎡.

[0013] The beneficial effects of this technical solution are as follows: controlling the spraying amount within the range of 12-15 g / ㎡ ensures that the barrier layer has sufficient thickness to provide effective isolation, while avoiding increased costs or reduced flexibility due to excessive thickness. This optimizes resource utilization, improves the stability of barrier performance, and prevents localized failures caused by uneven spraying, thereby ensuring that the pigment in the printing paper does not become blurred or faded due to the reaction of the adhesive layer during the pressing process. In addition, this range is compatible with common production equipment, reducing the difficulty of process adjustment and facilitating quality control in mass production. As a preferred method, the spraying amount is achieved through a precision metering pump, which dynamically adjusts the flow rate according to the area of ​​the self-developing paper layer. The working principle is based on fluid dynamics to ensure uniform distribution; at the same time, an online thickness monitoring system can be used to feedback and control the spraying parameters to avoid over- or under-spraying, achieving efficient isolation. Another preferred method is to combine a cooling and curing process, which cures the barrier layer immediately after spraying, ensuring that the spraying amount is accurately converted into film density. The working principle involves a self-cooling circulation system to accelerate the curing of the plastic, forming a dense, non-porous structure.

[0014] Furthermore, after the insulating layer is formed on the self-developing paper layer, the matte film layer, the adhesive layer, and the insulating layer are bonded together by a film coating.

[0015] The beneficial effects of this technical solution are as follows: the lamination bonding process achieves a high-strength integrated bond between the matte film layer, adhesive layer, and release layer, avoiding interlayer peeling or bubble problems, thereby improving the overall structural integrity and durability of the printing paper. This ensures that the release layer remains stable in position during long-term use, effectively isolating the adhesive layer from the pigment and preventing the marks from fading; at the same time, the lamination process simplifies the assembly steps, reduces production costs, and enhances resistance to environmental stresses (such as temperature changes). As a preferred method, lamination uses a hot-press lamination device, which uses heating and pressure to evenly distribute the adhesive layer between the release layer and the matte film layer. The working principle is based on the flow of thermally activated adhesive to fill micro-gaps, forming a seamless bond; at the same time, the equipment parameters (such as temperature and pressure) are adjustable to adapt to different material properties and ensure strong adhesion. Another preferred method is to design the adhesive layer as a double-sided coating structure, in which the adhesive layer is pre-coated on the matte film layer and then pressed with the release layer. The working principle involves the wetting effect of the adhesive to achieve rapid curing and bonding.

[0016] Furthermore, it also includes a tear-resistant layer and an adhesive layer, wherein the tear-resistant layer and the insulating layer are respectively disposed on both sides of the self-developing paper layer, and the adhesive layer and the self-developing paper layer are respectively disposed on both sides of the tear-resistant layer, and the adhesive layer is used to adhere to the recording medium.

[0017] The beneficial effects of this technical solution are as follows: the tear-resistant layer enhances the mechanical strength of the printing paper, preventing damage to the self-developing paper layer due to tearing during use or transportation, and ensuring the integrity of the color-developing microcapsules; the adhesive layer facilitates users in fixing the printing paper to various recording media (such as paper or sheet metal surfaces), improving ease of use and applicability. This expands the product's application scenarios, such as maintaining reliability in outdoor or frequently operated environments, while avoiding pigment leakage or functional failure due to tearing. As a preferred approach, the tear-resistant layer uses a high-toughness polymer film (such as polyester), whose interwoven fiber structure disperses stress, and its working principle is based on the tensile modulus of the film absorbing impact energy; the adhesive layer is designed as a removable adhesive coating, achieving instant adhesion and removal through an adhesive surface, and its working principle involves intermolecular forces to ensure a balance between cohesive and adhesive forces. Another preferred approach is to pre-composite the tear-resistant layer and the self-developing paper layer with hot melt adhesive to form a buffer interface, reducing stress concentration, while adding a UV curing agent to the adhesive layer to enhance environmental stability.

[0018] Furthermore, the tear-resistant layer is a PET film, a second adhesive layer is coated on the tear-resistant layer, and the tear-resistant layer is connected to the self-displaying paper layer through a film coating.

[0019] The beneficial effects of this technical solution are as follows: PET film (polyethylene terephthalate) possesses high strength, abrasion resistance, and dimensional stability, effectively preventing the printing paper from tearing during pressing or handling, thus extending its service life; simultaneously, the lamination ensures strong interface adhesion, avoiding delamination issues. This enhances product durability and safety, reduces the risk of failure due to mechanical damage, and is suitable for high-load application environments. A preferred method is to perform corona treatment on the PET film surface to increase surface energy and improve adhesion to the self-developing paper layer; the working principle involves surface modification to enhance chemical bonding.

[0020] Furthermore, it also includes a carrier layer, which and the tear-resistant layer are respectively disposed on both sides of the adhesive layer, and the carrier layer is used to prevent the adhesiveness of the adhesive layer from decreasing.

[0021] The beneficial effects of this technical solution are as follows: the carrier layer protects the adhesive layer from environmental factors (such as dust, moisture, or oxidation), preventing a decrease or failure of adhesion and ensuring that the printing paper maintains good adhesion performance before use; at the same time, it facilitates storage and transportation, reducing waste. This improves the product's shelf life and user convenience, avoiding inconvenience caused by adhesive layer contamination. As a preferred approach, the carrier layer uses silicone paper, whose silicone coating forms a low surface energy barrier, working on the principle that silicone oil molecules repel contaminants and moisture; simultaneously, the carrier layer can be designed as a peelable structure, allowing for easy removal through a weak adhesive interface. Another preferred approach is to add an antistatic agent to the carrier layer to reduce dust adsorption, working on the principle of maintaining the cleanliness of the adhesive layer through a charge neutralization mechanism. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the rubbing paper according to an embodiment of the present invention;

[0023] Figure 2 This is the initial state of the embodiment of this utility model and the state after rubbing with conventional rubbing paper;

[0024] Figure 3 These are images showing the state of the present invention and conventional printing paper after a 12-hour constant temperature and humidity test.

[0025] Figure 4 The images show the state of this utility model embodiment and conventional printing paper after a 24-hour constant temperature and humidity test. Detailed Implementation

[0026] This utility model embodiment provides a type of rubbing paper, such as... Figure 1As shown: The printing paper 1 comprises multiple functional layers to achieve efficient printing effects and durability. The self-developing paper layer 11 serves as the core layer, on which color-developing microcapsules (not shown) are uniformly arranged. These microcapsules rupture under external pressure, releasing the pigment they contain and leaving it on the surface of the self-developing paper layer 11, forming a clear pattern. The self-developing paper layer 11 typically uses existing self-developing paper materials to ensure stable distribution of the microcapsules. An isolation layer 12 is disposed above the self-developing paper layer 11 to physically isolate the adhesive layer 13 from the self-developing paper layer 11, preventing the components in the adhesive layer 13 from reacting with the pigment and causing the mark to fade. The isolation layer 12 is formed through a coating process, specifically by hot-melting plastic particles and spraying them onto the self-developing paper layer 11. The plastic particles are selected from low-density polyethylene resin to provide good isolation and flexibility. The coating spraying amount is controlled at 12-15 g / m² to ensure uniform layer thickness and not affect overall performance. The adhesive layer 13 is located above the barrier layer 12 and is used for bonding; the matte film layer 14 is disposed above the adhesive layer 13 to provide a matte surface to reduce reflection and facilitate printing operations; the matte film layer 14, the adhesive layer 13 and the barrier layer 12 are bonded by a lamination process, that is, after the barrier layer 12 is formed, the adhesive layer 13 is sandwiched between the matte film layer 14 and the barrier layer 12, and a firm bond is achieved by hot pressing or cold pressing lamination.

[0027] The lamination and manufacturing steps of the printing paper 1 are as follows: First, a self-developing paper layer 11 is prepared, and plastic particles are sprayed onto its surface to form an insulating layer 12, with the spraying amount controlled at 12-15 g / m². Subsequently, an adhesive layer 13 is coated on the lower surface of a matte film layer 14, and then covered onto the insulating layer 12. Pressure and temperature are applied using a laminating device to bond the matte film layer 14, adhesive layer 13, and insulating layer 12 together. A tear-resistant layer 15 is disposed below the self-developing paper layer 11 to increase the toughness and tear resistance of the printing paper 1. The tear-resistant layer 15 is preferably a PET film, and a second adhesive layer 18 is coated on it and connected to the self-developing paper layer 11 through a laminating process. An adhesive layer 16 is disposed below the tear-resistant layer 15 to adhere the printing paper 1 to a recording medium such as paper or sheet metal. A carrier layer 17 is disposed below the adhesive layer 16, usually silicone paper, to protect the adhesiveness of the adhesive layer 16 and prevent it from decreasing before use.

[0028] To verify the difference in fading speed between this embodiment and conventional printing paper (i.e., ordinary printing paper without an insulating layer), this embodiment also provides a verification method such as... Figure 2-4 As shown (where A and B refer to conventional rubbing paper, and C and D refer to rubbing paper 1 in this embodiment): after rubbing paper 1 in this embodiment and conventional rubbing paper are respectively rubbed, they are placed in the same constant temperature and humidity chamber, and the experimental environment is set to constant temperature of 60°C and constant humidity of 95%.

[0029] In this embodiment, the initial conditions of the rubbing paper 1 and the conventional rubbing paper are as follows: Figure 2 As shown; after placing the rubbing paper 1 and the conventional rubbing paper under the above experimental environment for 12 hours, the surface fading is as follows. Figure 3 As shown; after the rubbing paper 1 and conventional rubbing paper were placed under the above experimental environment for 24 hours, the surface fading was as follows. Figure 4 As shown. This demonstrates that, compared to conventional rubbing paper in the prior art, the rubbing paper with added insulating layer 12 in this embodiment fades more slowly and the rubbing has a longer durability.

[0030] The above embodiments are merely one preferred embodiment of the present utility model. Ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model's technical solution are all included within the protection scope of the present utility model.

Claims

1. A printing paper, comprising a matte film layer and a self-developing paper layer, wherein color-developing microcapsules are arranged on the self-developing paper layer and the color-developing microcapsules rupture upon pressure, leaving the pigment encapsulated inside on the self-developing paper layer, and an adhesive layer is disposed between the matte film layer and the self-developing paper layer, characterized in that: It also includes an insulating layer located between the self-developing paper layer and the adhesive layer and used to isolate the self-developing paper layer and the adhesive layer. The insulating layer and the matte film layer are connected by the adhesive layer.

2. The rubbing paper according to claim 1, characterized in that: The insulating layer is formed by spraying plastic particles onto the self-developing paper layer through a coating process after hot melting.

3. The rubbing paper according to claim 2, characterized in that: The plastic particles are made of polyethylene resin.

4. The rubbing paper according to claim 3, characterized in that: The plastic particles are made of low-density polyethylene resin.

5. A printing paper according to claim 2 or 3, characterized in that: The spraying rate for membrane coating is 12-15 g / ㎡.

6. A printing paper according to any one of claims 1-4, characterized in that: After the insulating layer is formed on the self-developing paper layer, the matte film layer, the adhesive layer and the insulating layer are bonded together by a film coating.

7. A printing paper according to any one of claims 1-4, characterized in that: It also includes a tear-resistant layer and an adhesive layer, wherein the tear-resistant layer and the insulating layer are respectively disposed on both sides of the self-developing paper layer, and the adhesive layer and the self-developing paper layer are respectively disposed on both sides of the tear-resistant layer, and the adhesive layer is used to adhere to the recording medium.

8. The rubbing paper according to claim 7, characterized in that: The tear-resistant layer is a PET film, and a second adhesive layer is coated on the tear-resistant layer. The tear-resistant layer is connected to the self-displaying paper layer through a film coating.

9. The rubbing paper according to claim 7, characterized in that: It also includes a carrier layer, which and a tear-resistant layer are respectively disposed on both sides of the adhesive layer, and the carrier layer is used to prevent the adhesiveness of the adhesive layer from decreasing.

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