A wrapping paper and a manufacturing process thereof

Abstract

This invention proposes a novel decorative wrapping paper and its manufacturing process, relating to the field of decorative wrapping paper manufacturing technology. The paper includes a base layer and a coating layer. The base layer is a pretreated plant fiber-based paper, and the coating layer covers at least one surface of the base layer. The novel decorative wrapping paper and its manufacturing process allow sodium carboxymethyl cellulose and chitosan in the coating layer to form a dense film structure, blocking moisture penetration. Testing shows that the decorative wrapping paper exhibits no significant penetration or damage after contact with water within 24 hours, demonstrating significantly better water resistance than ordinary decorative wrapping paper. Glycerin enhances the flexibility of the coating layer, preventing the paper from becoming brittle and breaking after coating. Furthermore, both sodium carboxymethyl cellulose and chitosan are biodegradable materials with no environmental burden, solving the environmental problems associated with polyethylene-coated decorative wrapping paper. The coating layer and base layer are tightly bonded after pretreatment, preventing peeling and improving overall paper strength, allowing the packaging to maintain its shape for a long time, making it suitable for long-distance transportation.

Description

Technical Field

[0001] This invention relates to the field of decorative paper manufacturing technology, and in particular to a decorative paper and its manufacturing process. Background Technology

[0002] Flower wrapping paper is a functional material specifically designed for flower packaging. Its core function is to protect flowers from external damage and reduce moisture loss during transportation, gifting, and display. It can also enhance the overall aesthetics of the bouquet through the matching of materials and colors, while helping to fix the shape of the bouquet and make the flowers present a more regular shape.

[0003] Most flower wrapping papers on the market are made from ordinary plant fiber base paper without specific water-resistant modification treatment. During packaging and transportation, the cut ends of flower stems continuously seep moisture, or small amounts of water need to be sprayed during preservation. This moisture easily penetrates the wrapping paper, causing the fiber structure to loosen, strength to decrease, and problems such as wrinkles and tears to occur. This not only affects the aesthetics of the flower packaging but may also lead to poor flower stability due to paper damage, increasing the risk of flowers falling off. Although some existing technologies attempt to improve water resistance by coating with polyethylene film, polyethylene is difficult to degrade, easily causing environmental burden, and the film is prone to peeling off during the lamination process, failing to simultaneously achieve water resistance, environmental friendliness, and stability in use. Summary of the Invention

[0004] Based on the technical problems existing in the background art, the present invention proposes a wrapping paper and its manufacturing process.

[0005] The present invention proposes a wrapping paper, comprising a base layer and a coating layer; the base layer is a pretreated plant fiber base paper, and the coating layer covers at least one surface of the base layer.

[0006] Preferably, the coating layer is formed by applying a coating liquid to the surface of the substrate and curing it. The raw materials of the coating liquid include, by weight, 5-8 parts sodium carboxymethyl cellulose, 2-4 parts chitosan, 1-3 parts glycerol, and 85-92 parts deionized water; the thickness of the coating layer is 5-10 μm.

[0007] Preferably, the moisture content of the base layer is 6-8%.

[0008] A manufacturing process for decorative wrapping paper includes the following steps:

[0009] Step 1, Substrate Pretreatment: Place the plant fiber base paper in a drying device at a temperature of 40-50℃ for 10-15 minutes to control the moisture content of the substrate at 6-8%;

[0010] Step 2, preparation of coating solution: Add deionized water to a mixing tank, and add sodium carboxymethyl cellulose and chitosan in sequence under the condition of stirring speed of 300-400 r / min. Stir for 20-30 minutes until completely dissolved, then add glycerol and continue stirring for 10-15 minutes to obtain the coating solution.

[0011] Step 3, Coating Operation: Using a scraper coating method, evenly apply the coating liquid to the pretreated substrate surface, controlling the coating amount to 8-12 g / m². 2 ;

[0012] Step 4, Drying and Shaping: Place the coated base layer in a drying device and dry it for 20-25 minutes at a temperature of 50-60℃;

[0013] Step 5: Rolling and Cutting: Roll up the dried paper and cut it to the preset size to obtain the wrapping paper.

[0014] Preferably, the basis weight of the plant fiber base paper in step 1 is 30-50 g / m³. 2 .

[0015] Preferably, the sodium carboxymethyl cellulose in step 2 is food-grade sodium carboxymethyl cellulose.

[0016] Preferably, in step 2, chitosan is extracted from shrimp and crab shells.

[0017] Preferably, in step 3, the distance between the scraper and the substrate in the scraper coating method is 0.1-0.3 mm.

[0018] Preferably, the drying equipment in step 4 is a hot air drying equipment, and the air velocity inside the equipment during the drying process is 1-2 m / s.

[0019] Preferably, the preset size in step 5 is 25-40cm × 30-50cm.

[0020] The decorative paper and its manufacturing process proposed in this invention have the following beneficial effects: improved water resistance: sodium carboxymethyl cellulose and chitosan in the coating layer can form a dense film structure to block water penetration. After testing, the decorative paper showed no obvious penetration or damage within 24 hours after contact with water, and its water resistance was significantly better than that of ordinary decorative paper.

[0021] Ensuring flexibility and environmental friendliness: Glycerin can enhance the flexibility of the coating layer, preventing the paper from becoming brittle and breaking after coating; and sodium carboxymethyl cellulose and chitosan are both biodegradable materials with no environmental burden, solving the environmental problems of polyethylene coated paper.

[0022] Improved stability: The coating layer and the base layer are tightly bonded after pretreatment, making it less prone to peeling. The overall paper strength is also improved, allowing it to maintain its packaging shape for a long time, making it suitable for long-distance transportation. Attached Figure Description

[0023] Figure 1 This is a flowchart illustrating the manufacturing process of a decorative paper according to the present invention. Detailed Implementation

[0024] Reference Figure 1 This invention proposes a wrapping paper, which has a double-layer composite structure, including a base layer and a coating layer:

[0025] For base layers: use a dosage of 30-50g / m³. 2 The plant fiber base paper has a moisture content of 6-8% in the base layer, and possesses basic stiffness and flexibility.

[0026] Coating layer: Covers at least one surface of the substrate (single-sided or double-sided coating can be selected according to requirements), with a coating thickness of 5-10 μm. The raw materials include, by weight: 5-8 parts of food-grade sodium carboxymethyl cellulose (degree of substitution 0.6-0.8), 2-4 parts of chitosan extracted from shrimp and crab shells (molecular weight 50,000-100,000 Da), 1-3 parts of food-grade glycerin, and 85-92 parts of deionized water. (The coating layer covers at least one surface of the substrate, with a coating thickness of 5-10 μm. The coating layer is formed by curing the coating liquid. The 180° peel strength between the coating layer and the substrate is ≥0.5 N / cm. It can withstand 50 repeated folds at 180° without cracking. The coating layer has an antibacterial rate of ≥80% against Escherichia coli and shows no obvious penetration or damage within 24 hours of contact with water.)

[0027] The manufacturing process of wrapping paper:

[0028] Includes the following steps:

[0029] Step 1, Substrate pretreatment: Prepare a substrate with a dosage of 30-50 g / m³. 2 The plant fiber base paper is placed in a hot air drying device at a temperature of 40-50℃ for 10-15 minutes for pretreatment, so that the moisture content of the base layer is controlled at 6-8%.

[0030] Step 2, Preparation of coating solution: Add 85-92 parts by weight of deionized water to a mixing tank. While stirring at 300-400 r / min, add 5-8 parts by weight of food-grade sodium carboxymethyl cellulose and 2-4 parts by weight of chitosan extracted from shrimp and crab shells. Stir for 20-30 minutes until completely dissolved. Then add 1-3 parts by weight of food-grade glycerol and continue stirring for 10-15 minutes to obtain the coating solution. The degree of substitution of food-grade sodium carboxymethyl cellulose is 0.6-0.8, and the molecular weight of chitosan extracted from shrimp and crab shells is 50,000-100,000 Da.

[0031] Step 3, Coating Operation: Use a scraper to apply the coating liquid evenly to the pretreated substrate surface, adjusting the distance between the scraper and the substrate to 0.1-0.3 mm. The coating amount should be controlled at 8-12 g / m². 2 The coating operation can be selected as single-sided coating or double-sided coating. When double-sided coating, the time interval between the two coatings is 5-8 minutes.

[0032] Step 4, Drying and Shaping: Place the coated base layer into a hot air drying device, control the temperature at 50-60℃ and the air speed at 1-2m / s, and dry for 20-25 minutes; the drying process adopts a gradient heating method, with the initial temperature at 40℃, and the temperature increasing by 5℃ every 5 minutes until it reaches 50-60℃ and is maintained until the drying is completed;

[0033] Step 5: Rolling and Cutting: Roll up the dried paper with a tension of 5-8N and cut it into the preset size of 25-40cm×30-50cm to obtain the wrapping paper.

[0034] Example 1

[0035] Process steps

[0036] Primary pretreatment

[0037] The selected dosage is 40g / m 2 Commercial-grade plant fiber base paper was placed in a laboratory hot air drying device (model HG-101) and pre-treated for 12 minutes at a temperature of 45℃ (the standard pre-treatment temperature for plant fiber paper to avoid fiber embrittlement). The final test showed that the moisture content of the base layer was 7%, which kept the surface fibers of the base layer in a "dry and slightly rough" state. This reduced the dilution of the coating liquid by the moisture inside the base layer and increased the contact area between the base layer and the coating liquid, thus preventing the coating layer from bubbling and peeling off.

[0038] Preparation of coating solution

[0039] Add 270g of deionized water to a 500mL stainless steel mixing vessel and start the stirrer at 350r / min (the standard stirring speed for dissolving food-grade polymer materials). First, add 15g of food-grade sodium carboxymethyl cellulose and stir for 25 minutes until completely dissolved. Then, add 9g of chitosan extracted from shrimp and crab shells (molecular weight 80,000 Da) and continue stirring for 25 minutes. Finally, add 6g of food-grade glycerol and stir for 12 minutes to obtain a uniform coating solution without precipitation. The carboxyl groups of sodium carboxymethyl cellulose form hydrogen bonds with the amino groups of chitosan, improving the stability of the system and forming a dense network structure after film formation. The chitosan molecular chains interweave to fill the gaps and synergistically block water penetration. Glycerol acts as a plasticizer, lowering the glass transition temperature of the coating layer and weakening the internal hydrogen bond density, preventing the coating layer from becoming brittle after curing.

[0040] Coating operation

[0041] Using a laboratory-grade blade coater (models such as YT-200 and QT-300), adjust the distance between the blade and the substrate to 0.2mm (the standard adjustment range for laboratory blade coaters is 0.05-0.5mm). Apply the coating liquid evenly to the pretreated substrate surface at a coating weight of 10g / m². 2 The final coating thickness was 7μm. The blade spacing and coating amount were precisely controlled to ensure uniform coating thickness. The coating was neither too thin, resulting in insufficient water resistance and antibacterial properties, nor too thick, affecting the flexibility of the base layer. At the same time, the coating liquid was allowed to fully penetrate the base layer fibers.

[0042] Drying and setting

[0043] The coated substrate is placed back into the hot air drying equipment and a gradient heating method is adopted. The initial temperature is 40℃, and the temperature is increased by 5℃ every 5 minutes, and finally maintained at 55℃ with a wind speed of 1.5m / s for 22 minutes. The gradient heating and uniform ventilation allow the moisture in the coating liquid to evaporate slowly, avoiding rapid drying that could cause cracks in the coating layer. During the drying process, the components of the coating liquid form physical adsorption (van der Waals forces) and chemical bonding (hydrogen bonds) with the substrate fibers, further enhancing the bonding strength.

[0044] Rolling and cutting

[0045] The paper is wound at a constant speed with a tension of 6N using a small laboratory winding machine to prevent stretching and deformation. It is then cut into 30cm×40cm sizes using a cutting machine to obtain the finished flower wrapping paper. The paper is kept flat with stable winding tension to prevent wrinkles during subsequent use. The preset size is suitable for mainstream bouquet packaging needs.

[0046] Performance testing

[0047] Water resistance test: Referring to GB / T460-2002 "Determination of water absorption of paper and paperboard - Koebner method", 5mL of room temperature water was dropped on the surface of the finished product. After standing for 24 hours, the amount of water seepage was only 0.3mL. There was no penetration or damage, and only slight surface dampness. After the water was poured off, it returned to flatness within 1 hour, which meets the requirements of flower stem seepage and freshness preservation spraying scenarios.

[0048] Combined with stability testing: referring to GB / T2792-2014 "Test Method for 180° Peel Strength of Pressure Sensitive Adhesive Tape", the 180° peel strength was tested to be 0.6 N / cm. There is no coating layer peeling off during daily rubbing and handling, solving the problem of film peeling off traditional coated paper.

[0049] Flexibility test: Refer to the appendix method of GB / T1539-2007 "Determination of Stiffness of Paperboard" for a test result of no cracks after 60 repeated 180° folds and no creases after bending, making it suitable for complex packaging folding operations.

[0050] Antibacterial properties test: Referring to GB / T20944.2-2007 "Evaluation of antibacterial properties of textiles - Part 2: Absorption method", the antibacterial rate against Escherichia coli was 85%, and the antibacterial rate against Bacillus subtilis was 83%. It inhibits bacterial growth at the cut of flower stems and extends the freshness of flowers by 2.5 days compared with ordinary wrapping paper, achieving the effect of antibacterial preservation.

[0051] Environmental verification: Referring to GB / T27761-2011 "Definition, classification, marking and degradation performance requirements of degradable plastics", the finished product was buried in the soil. After 3 months, the degradation rate reached 82%, with no environmental pollution. All raw materials are natural degradable materials.

[0052] Safety testing: Referring to GB4806.1-2016 "National Food Safety Standard for Food Contact Materials and Products - General Safety Requirements", the finished product does not release any toxic or harmful substances and can directly contact flowers.

[0053] Example 2

[0054] Process steps

[0055] Base layer pretreatment: 30 g / m³ was selected. 2 The commercial-grade plant fiber base paper is dried with hot air at 40℃ for 15 minutes, with the moisture content controlled at 6%. Working principle: The low basis weight base extends the drying time and lowers the temperature to avoid over-drying and causing fiber embrittlement. The low moisture content of 6% reduces the amount of coating liquid absorbed, making it suitable for low coating weight designs.

[0056] Preparation of coating solution: Add 255g of deionized water and stir at 300r / min; add 12g of food-grade sodium carboxymethyl cellulose and stir for 20 minutes; add 6g of shrimp and crab shell extracted chitosan (molecular weight 50000Da) and stir for 20 minutes; add 3g of glycerol and stir for 10 minutes; Working principle: Low-concentration coating solution reduces raw material costs, and low-substituted sodium carboxymethyl cellulose and low-molecular-weight chitosan have better solubility and are suitable for low stirring speed.

[0057] Coating procedure: 0.1mm blade spacing (lower limit of standard adjustment for laboratory coating machines), coating amount 8g / m³ 2 The coating thickness is 5μm. Working principle: The low blade spacing and coating amount prevent the low basis weight substrate from being soaked by the coating liquid, ensuring the water-resistant film structure of the base layer.

[0058] Drying and setting: Gradually increase the temperature to 50℃, maintain a wind speed of 1m / s, and dry for 25 minutes. Working principle: For low-volume coatings, the drying time needs to be extended to ensure sufficient moisture evaporation and prevent poor adhesion.

[0059] Rewinding and Cutting: 5N tension rewinding, cut to 25cm×30cm size. Working principle: Low tension rewinding protects low basis weight paper, and the small size is suitable for packaging single flowers or small bouquets, reducing waste of scraps.

[0060] Performance testing

[0061] Water resistance: According to GB / T460-2002, the water seepage rate is 0.5mL in 24 hours without damage, which meets the basic water resistance requirements for short-distance transportation of small bouquets.

[0062] Bonding stability: Referring to GB / T2792-2014, the peel strength at 180° is 0.5 N / cm, with no coating layer peeling, achieving low cost and stability.

[0063] Flexibility: It can withstand 180° repeated folding 50 times without cracking, making it suitable for simple folding and packaging of small bouquets. It ensures that the flexibility of the wrapping paper meets basic needs.

[0064] Antibacterial properties: According to GB / T20944.2-2007, the antibacterial rate against Escherichia coli is 80%, and the shelf life is extended by 2 days, which can ensure basic preservation and meet daily needs.

[0065] Environmental friendliness: According to GB / T27761-2011, the soil degradation rate is 80%, which meets the environmental protection requirements and has a high cost-performance ratio.

[0066] Cost Analysis: Compared with Example 1, the raw material cost is reduced by 30% and the production efficiency is increased by 15%, making it suitable for small and medium-sized enterprises to scale up the production of basic decorative paper.

[0067] Example 3

[0068] Process steps

[0069] Base layer pretreatment: 50g / m³ was selected. 2 The commercial-grade plant fiber base paper is dried with hot air at 50℃ for 10 minutes, with the moisture content controlled at 8%. Working principle: The high basis weight base retains an appropriate amount of moisture to avoid the surface being too smooth and affecting the adhesion of the coating liquid. The 50℃ high temperature quickly removes free moisture, improving the pretreatment efficiency.

[0070] Coating solution preparation: Add 276g of deionized water and stir at 400 rpm (standard stirring speed for high-concentration systems); add 24g of food-grade sodium carboxymethyl cellulose (substitution degree 0.8) and stir for 30 minutes; add 12g of shrimp and crab shell-derived chitosan (molecular weight 100,000 Da) and stir for 30 minutes; add 9g of glycerol and stir for 15 minutes. Working principle: High-substitution sodium carboxymethyl cellulose forms a denser film; high-molecular-weight chitosan has stronger antibacterial properties; high stirring speed ensures uniformity in the high-concentration system; and increased glycerol dosage offsets the risk of embrittlement associated with high coating weight.

[0071] Coating procedure: 0.3mm blade spacing (upper limit of standard adjustment for laboratory coating machines), coating amount 12g / m³ 2 The coating thickness is 10μm. Working principle: The high blade spacing and coating amount form a thicker and denser film layer, which improves water resistance and antibacterial properties. The high basis weight base layer can support a thicker coating layer without affecting flexibility.

[0072] Drying and setting: Gradual heating to 60℃, air velocity 2m / s, drying for 20 minutes. Working principle: High temperature and high air velocity quickly remove moisture from the high-volume coating liquid, preventing the film from becoming too thick and causing cracking, thus improving production efficiency.

[0073] Rewinding and Cutting: 8N tension rewinding (the upper limit of the standard tension for rewinding machines), cut to 40cm×50cm size. Working principle: High-tension rewinding makes high-basis-weight paper smoother, and the large size is suitable for packaging large gift bouquets or floral arrangements, enhancing the sense of luxury.

[0074] Performance testing

[0075] Water resistance: According to GB / T460-2002, the water seepage rate is 0.2mL in 24 hours, with no penetration. It is suitable for long-distance transportation or high-moisture preservation scenarios and has excellent water resistance.

[0076] Bonding stability: According to GB / T2792-2014, the peel strength at 180° is 0.7N / cm, with strong abrasion resistance and tearing ability, and the wrapping paper has the ultimate stability in use.

[0077] Flexibility: It can withstand 180° repeated folding 55 times without cracking, making it suitable for complex and high-end bouquet packaging designs, ensuring the flexibility and performance of the wrapping paper.

[0078] Antibacterial properties: According to GB / T20944.2-2007, the antibacterial rate against Escherichia coli is 90%, and the shelf life is extended by 3 days, making the antibacterial and preservation effect of the wrapping paper outstanding.

[0079] Environmental friendliness: According to GB / T27761-2011, the soil degradation rate is 78%, which still meets the environmental protection requirements, thus satisfying both high-end and environmental protection needs.

[0080] Appearance and texture: The coating layer is uniform and glossy, without bubbles or cracks, enhancing the premium feel of the bouquet packaging and ensuring the unity of decoration and functionality of the wrapping paper.

[0081] Example 4

[0082] Process steps

[0083] Base layer pretreatment: 40 g / m³ was selected. 2The commercial-grade plant fiber base paper is dried with hot air at 45℃ for 12 minutes, resulting in a moisture content of 7%, providing a uniform and stable base layer for double-sided coating. Working principle: Uniform moisture content ensures consistent wetting of the coating liquid on both sides, avoiding insufficient adhesion on one side.

[0084] Coating solution preparation: The formula is the same as in Example 1, with consistent stirring parameters to ensure the stability of the coating solution and meet the consistency requirements of double-sided coating. Working principle: A unified formula avoids performance differences between the two sides, ensuring overall performance balance.

[0085] Coating operation: First, perform a single-sided coating (parameters are the same as in Example 1: blade spacing 0.2 mm, coating amount 10 g / m²). 2 After standing for 6 minutes, apply a second coat to the other side, with the parameters for both coats being exactly the same. Working principle: The 6-minute interval allows the liquid film from the first coat to initially wet and cure, preventing the two liquid films from mixing and ensuring that the thickness of the double-sided coating is uniform (both 7μm), allowing each layer of coating liquid to fully bond with the substrate.

[0086] Drying and setting: Gradually increase the temperature to 55℃, maintain an air velocity of 1.5m / s, and dry for 22 minutes. During the intermediate stage (minutes 10-15), maintain a stable temperature to ensure that both coating layers are fully cured. Working principle: Extending the intermediate heat preservation time is necessary for double-sided coating to prevent the inner layer from failing to evaporate moisture, which could lead to delamination and bubbles.

[0087] Rewinding and Cutting: Rewound with 7N tension and cut to 35cm x 45cm size, suitable for use in high humidity environments. Working Principle: Medium tension balances flatness and flexibility, preventing deformation of double-sided coated paper due to excessive tension.

[0088] Performance testing

[0089] Water resistance: According to GB / T460-2002, 5mL of room temperature water is dropped on both sides and no penetration or damage is observed after 24 hours. The water penetration amount is 0.3mL on both sides. It is suitable for high humidity environments such as the plum rain season in the south, achieving double-sided water resistance without dead corners.

[0090] Bonding stability: Referring to GB / T2792-2014, the 180° peel strength of both the double-sided coating layer and the substrate is 0.65 N / cm, with no peeling or delamination, achieving stable and balanced double-sided coating.

[0091] Flexibility: It can withstand 58 repeated 180° folds without cracking, adapting to complex packaging folding requirements, and maintaining flexibility even with double-sided coating.

[0092] Antibacterial properties: According to GB / T20944.2-2007, the antibacterial rate on both sides is 87%, which comprehensively inhibits the growth of bacteria and ensures that there are no dead ends in antibacterial treatment.

[0093] Moisture resistance: After being placed in an environment with a relative humidity of 85% for 7 days, the paper did not become damp or deformed, demonstrating excellent moisture resistance.

[0094] Example 5

[0095] Process steps

[0096] Base layer pretreatment: 45 g / m³ was selected. 2 Commercial-grade plant fiber base paper, dried with hot air at 48℃ for 11 minutes, with a moisture content of 7.5%. Working principle: The slightly higher moisture content improves the paper's flexibility in low-temperature environments, preventing it from becoming brittle when frozen.

[0097] Coating solution preparation: 273g deionized water, stirring speed 380r / min; 21g sodium carboxymethyl cellulose, degree of substitution 0.75; 10.5g chitosan, molecular weight 85000Da; 7.5g glycerol, stirring time extended to 35 minutes. Working principle: Increasing the amount of glycerol further improves the low-temperature flexibility of the coating layer, preventing cracking at low temperatures.

[0098] Coating procedure: blade spacing 0.25mm, coating amount 11g / m² 2 The coating thickness is 8.5μm. Working principle: The slightly thicker coating layer forms a thicker insulation and protective film, suitable for low-temperature environments.

[0099] Drying and setting: Gradual temperature increase to 58℃, air velocity 1.8m / s, drying for 21 minutes, followed by a 5-minute holding period at 50℃ during the later stages of drying. Working principle: The subsequent cooling and holding reduces the difference in thermal expansion and contraction between the coating layer and the substrate, preventing peeling under low-temperature conditions.

[0100] Rewinding and Cutting: Rewound with 6.5N tension and cut to 32cm×42cm size, suitable for northern winters or low-temperature transportation scenarios. Working Principle: Balances stability and practicality in low-temperature environments with moderate tension and size.

[0101] Performance testing

[0102] Low-temperature water resistance: Referring to GB / T460-2002, when 5mL of room temperature water is added in an environment of -5℃, there is no penetration or damage after 24 hours, which shows that the water resistance is stable in a low-temperature environment.

[0103] Low-temperature flexibility: According to the method in Appendix GB / T1539-2007, it can be repeatedly folded 180° 45 times in a -10℃ environment without cracking or brittleness, making it suitable for outdoor packaging in northern winters and achieving the effect of low-temperature flexibility without brittleness.

[0104] Bonding stability: According to GB / T2792-2014, the peel strength remains at 0.62 N / cm during temperature cycling from -10℃ to 25℃, with no peeling, ensuring stability and reliability in temperature-differential environments.

[0105] Antibacterial properties: According to GB / T20944.2-2007, the antibacterial rate against Escherichia coli is 84% ​​in an environment of 0-5℃, and the shelf life is extended by 2.8 days, achieving the effect of low-temperature antibacterial preservation.

[0106] Weather resistance: After being placed in an environment with a temperature range of -10℃ to 30℃ and a humidity range of 40% to 80% for 15 days, the paper showed no deformation, cracking, or mold growth, demonstrating its strong weather resistance.

[0107] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A type of decorative wrapping paper, characterized in that, It includes a base layer and a coating layer; the base layer is a pretreated plant fiber base paper, and the coating layer covers at least one surface of the base layer; The coating layer is formed by applying a coating liquid to the surface of the substrate and curing it. The raw materials of the coating liquid include, by weight, 5-8 parts sodium carboxymethyl cellulose, 2-4 parts chitosan, 1-3 parts glycerol, and 85-92 parts deionized water. The quantitative amount will be 30-50g / m³ 2 The plant fiber base paper is placed in a hot air drying device at a temperature of 40-50℃ for 10-15 minutes for pretreatment, so that the moisture content of the base layer is controlled at 6-8%. The thickness of the coating layer is 5-10 μm.

2. A manufacturing process for decorative wrapping paper, used to manufacture the decorative wrapping paper of claim 1, characterized in that, Includes the following steps: Step 1, Substrate Pretreatment: Place the plant fiber base paper in a drying equipment at a temperature of 40-50℃ for 10-15 minutes to control the moisture content of the substrate at 6-8%; Step 2, preparation of coating solution: Add deionized water to a mixing tank, and add sodium carboxymethyl cellulose and chitosan in sequence under the condition of stirring speed of 300-400 r / min. Stir for 20-30 minutes until completely dissolved, then add glycerol and continue stirring for 10-15 minutes to obtain the coating solution. Step 3, Coating Operation: Using a scraper coating method, evenly apply the coating liquid to the pretreated substrate surface, controlling the coating amount to 8-12 g / m². 2 ; Step 4, Drying and Shaping: Place the coated base layer in a hot air drying device and dry it for 20-25 minutes at a temperature of 50-60℃; Step 5: Rolling and Cutting: Roll up the dried paper and cut it to the preset size to obtain the wrapping paper.

3. A manufacturing process for wrapping paper according to claim 2, characterized in that, In step 2, the sodium carboxymethyl cellulose is food-grade sodium carboxymethyl cellulose.

4. A manufacturing process for wrapping paper according to claim 2, characterized in that, In step 2, chitosan is extracted from shrimp and crab shells.

5. A manufacturing process for wrapping paper according to claim 2, characterized in that, In step 3, the distance between the scraper and the substrate in the scraper coating method is 0.1-0.3mm.

6. A manufacturing process for wrapping paper according to claim 2, characterized in that, In step 4, the air velocity inside the hot air drying equipment during the drying process is 1-2 m / s.

7. A manufacturing process for wrapping paper according to claim 2, characterized in that, The preset size in step 5 is 25-40cm × 30-50cm.

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