High-speed packaging material with gold sand effect and production process thereof

Abstract

The present invention belongs to the technical field of packaging materials, and in particular, relates to a high-speed packaging material with a gold sand effect and its production process. The packaging material comprises a PP gold sand film, a PET printed film, an aluminized PET film, and a PE film, which are sequentially connected from the outside to the inside. The PE film includes a corona layer, an intermediate layer, and a heat-sealing layer. The corona layer is connected to the non-aluminized surface of the aluminized film, which is connected to the printed surface of the PET printed film, and the non-printed surface of the PET printed film is connected to the non-gold sand surface of the PP gold sand film. The present invention uses PP as the surface layer of the gold sand film, which has a better gold sand effect and appearance, while also enhancing heat resistance. Furthermore, the inner layer formulation is designed to provide improved low-temperature sealing performance, significantly increasing the packaging speed of the film, enabling automatic high-speed packaging and significantly improving packaging efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging materials, in particular to a high-speed packaging material with a gold sand effect and a production process thereof. Background Art

[0002] As modern consumer goods become increasingly diverse and diverse, consumers are increasingly spoiled for choice. When choosing a product, first impressions are crucial. Modern consumers often prioritize product appearance and quality. Products with attractive appearance often offer potential added value, increasing the likelihood that consumers will choose them immediately.

[0003] In recent years, there has been an increasing number of products with metallic-effect appearances, primarily achieved through composite aluminum-coated films. However, with the passage of time, metallic-effect products have become visually tiring for consumers and are difficult to attract. Certain technical means are needed to enhance the appearance of the film to better attract consumers.

[0004] Currently, some of the products with dazzling appearances on the market are mostly made of paper and rigid plastic. In recent years, frosted gold-coated films have been used as surface materials for flexible packaging products. The current packaging materials with attractive appearances generally consist of frosted PE / PET / VMPET / PE. Their main disadvantages are: the frosted PE outer layer has a relatively low heat resistance, typically between 120-130°C, and the inner heat-sealing PE layer has a relatively high heat-sealing initiation temperature. When used in automated packaging equipment, this type of film can suffer from weak seals and air leaks at low heat-sealing temperatures. At higher temperatures, the less heat-resistant frosted film surface is prone to wrinkling and poor appearance. Therefore, to ensure film airtightness and appearance, the customer's packaging equipment must have a narrow heat-sealing zone and slow packaging speeds. For products cut to a length of 145mm, only about 20 packages can be packed per minute, failing to meet the 50-60 packages / minute required by automated packaging equipment for packages cut to a length of 140-160mm. Therefore, there is an urgent need for a high-speed packaging material with a gold sand effect and a production process thereof to solve the above problems. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a high-speed packaging material with gold sand effect and a production process thereof.

[0006] In order to achieve one of the purposes of the present invention, the present invention adopts the following technical solutions:

[0007] A high-speed packaging material with a gold sand effect comprises a PP gold sand film, a PET printing film, an aluminized PET film, and a PE film connected in sequence from outside to inside. The PE film comprises a corona layer, an intermediate layer, and a heat-sealing layer. The corona layer comprises 12.5-15% of a first low-density polyethylene and 85-87.5% of a linear low-density metallic polyethylene. The intermediate layer comprises 20-25% of the first low-density polyethylene, 50-55% of the linear low-density metallic polyethylene, and 20-30% of a high-density polyethylene. The heat-sealing layer comprises 20-25% of a first metallocene polyethylene, 40-45% of a second metallocene polyethylene, 27-37% of a second low-density polyethylene, 1.2-1.7% of an anti-blocking agent, 1-1.2% of a lubricant, and 0.3-0.6% of a fluorine-containing processing aid. The corona layer is connected to the non-aluminized surface of the aluminized film, the aluminized surface of the aluminized film is connected to the printed surface of the PET printing film, and the non-printed surface of the PET printing film is connected to the non-gold sand surface of the PP gold sand film.

[0008] Preferably, the corona layer comprises 12.5% ​​of the first low-density polyethylene and 87.5% of the linear low-density metallic polyethylene; the intermediate layer comprises 25% of the first low-density polyethylene, 55% of the linear low-density metallic polyethylene and 20% of the high-density polyethylene; the heat-sealing layer comprises 25% of the first metallocene polyethylene, 45% of the second metallocene polyethylene, 27% of the second low-density polyethylene, 1.7% of the opening agent, 1% of the slip agent and 0.3% of the fluorine-containing processing aid.

[0009] Preferably, the brand of the first low-density polyethylene is 2420 produced by Yangba Petrochemical Company; the brand of the linear low-density metallic polyethylene is 7042 produced by Yangzi Petrochemical Company; the brand of the high-density polyethylene is HMA025 produced by Exxon; the brand of the second low-density polyethylene is 100AC produced by ExxonMobil; the brand of the first metallocene polyethylene is 2012MA produced by Exxon; the brand of the second metallocene polyethylene is 1881 produced by Dow Chemical Company; the brand of the anti-blocking agent is AB-20LD produced by Beijing Yalun Zhilian Company; the brand of the lubricant is 10090-K; and the brand of the fluorine-containing processing aid is 100991-K.

[0010] Preferably, the PP gold sand film is the PP gold sand film produced by Shenzhen Goldsmith Company.

[0011] Preferably, the melting point of the PP gold sand film is 140-150°C.

[0012] Preferably, the thickness ratio of the corona layer, the intermediate layer and the heat-sealing layer is 3:4:3.

[0013] Preferably, the thickness of the corona layer, the thickness of the intermediate layer and the thickness of the heat-sealing layer are 9 μm, 12 μm and 9 μm respectively.

[0014] In order to achieve the second object of the present invention, the present invention provides a production process of a high-speed packaging material with a gold sand effect, which specifically comprises the following steps:

[0015] S1. Printing process: printing the inner surface of the PET film to obtain a PET printed film;

[0016] S2, aluminum plating process: the surface of the PET film is subjected to an aluminum plating process to obtain an aluminum-plated PET film;

[0017] S3, film blowing process: weighing the particles of each layer of PE film and subjecting it to film blowing process to obtain PE film;

[0018] S4. Composite process: PP gold sand film, PET printing film, aluminum-coated PET film and PE film are composited to produce packaging materials.

[0019] The order of the above steps S1-S3 is not fixed.

[0020] Preferably, the composite process in step S4 is a dry composite; the PET printed film is composited with the aluminum-coated PET film to obtain PET / VMPET, and the gluing amount is 2.5-3.2 g / ㎡, the first unwinding tension is 60 N, and the second unwinding tension is 70 N; the PP gold sand film is composited with PET / VMPET to obtain PP gold sand film / PET / VMPET, and the gluing amount is 3.8-4.2 g / ㎡, the first unwinding tension is 80 N, and the second unwinding tension is 70 N; the PE film is composited with the PP gold sand film / PET / VMPET to obtain the packaging material, and the gluing amount is 2.5-3.2 g / ㎡, the first unwinding tension is 60 N, and the second unwinding tension is 70 N.

[0021] Preferably, the corona value of the non-golden sand surface of the PP gold sand film is 30-35 dynes, the non-golden sand surface of the PP gold sand film is subjected to online corona treatment, and the power of the corona machine is set to 20Kw; the corona value of the gold sand surface of the PP gold sand film is 38 dynes.

[0022] The beneficial effects of the present invention compared to the prior art are:

[0023] 1) The present invention uses PP of gold sand film as the surface layer, which has better gold sand effect and appearance effect, and the heat resistance is also enhanced. At the same time, through the design of the inner layer formula, it has better low-temperature sealing performance, so that the packaging speed of the film is greatly improved, automatic high-speed packaging is achieved, and the packaging efficiency is greatly improved.

[0024] 2) The melting point of the selected outer PP film is 140-150°C, significantly improving the heat resistance of the surface material compared to commercially available samples, thus widening the heat-sealing range of the customer's equipment. The inner PE layer's heat-sealing properties have been optimized through design and formulation, resulting in excellent low-temperature sealing performance. This significantly increases the automated packaging speed for this type of product, reaching 50-60 packages / min while maintaining the product's sealing and appearance.

[0025] 3) The thickness uniformity of PP film is generally poor, with a thickness difference of about 5μm between the thick and thin parts. This results in uneven coating of the adhesive in the thinner areas during the lamination process, which can easily cause composite pitting and bubbles. To solve this problem, the present invention reasonably sets the unwinding tension and glue amount of the PP film. Sufficient unwinding tension ensures the tightness of the PP film, and sufficient glue amount ensures that the adhesive can be evenly coated on the PP film, avoiding the generation of pitting and bubbles.

[0026] The corona value of the gold-sand surface of PP gold-sand film is approximately 38 dynes, while the corona value of the smooth composite surface (non-gold-sand surface) is approximately 32 dynes. If the smooth composite surface (32 dynes) is used for lamination, the composite fastness is generally only 0.2N / 15mm, which is relatively low. To improve this situation, the present invention performs an online corona treatment on the 32 dynes side of the PP gold-sand film during lamination. The corona treatment machine power is set to 20kW. This can achieve a dyne value of approximately 38 on the film surface, thereby improving the composite fastness to approximately 0.7N / 15mm.

[0027] 4) The corona layer of the PE film uses linear low-density polyethylene, which gives it good composite properties and can form good composite strength with VMPET. The middle layer is added with high-density polyethylene (brand HMA025 produced by Exxon) to give the film better stiffness. The heat seal layer uses Dow Chemical's metallocene PE1881, which is an ethylene-octene copolymer with a Vicat softening point of 86°C and a melting point of 100°C. It can greatly reduce the heat sealing temperature of the PE inner layer and improve the low-temperature heat sealing performance of the film. The addition of Exxon's metallocene polyethylene PE2012MA provides the film with good hot adhesive strength. However, the melting points of these two resins are low and difficult to process. The addition of a second low-density polyethylene (brand 100AC produced by ExxonMobil) has the advantage of greatly improving the processing performance of the PE film and ensuring the stability of the film during processing.

[0028] 5) This product utilizes Shenzhen Jinjiang's PP gold sand film. By combining the gold sand effect of the film with the customer's printed graphics and the metallic effect of VMPET, the product's appearance is even more dazzling and eye-catching. Upon close contact, the product feels soft and velvety, making the product appear more upscale and increasing customer satisfaction. Furthermore, the heat resistance of this PP gold sand film is significantly improved compared to commercially available PE gold sand film.

[0029] 6) The present invention enhances the impact resistance and pressure resistance of the air-filled packaging through the design of a reasonable composite structure, special inner layer materials and optimization of the composite process, shortens the packaging sealing time, improves the product forming rate and packaging efficiency, reduces or avoids package breakage and leakage caused by adverse factors during packaging, transportation and storage, and overcomes the serious shortcomings of low packaging efficiency caused by insufficient bonding strength and long bonding time in previous air-filled packaging. At the same time, due to the unique design of the pressure difference resistance function, the packaging scrap rate is greatly reduced, and the one-time qualified rate of the packaged product can be effectively guaranteed even under conditions of extrusion and collision. It not only saves packaging costs and reduces economic losses, but also effectively protects the contents of the package. Due to its excellent compressive resistance, it is not only used in food, but also widely used in the packaging of cosmetics, fine instruments, electronic components, and precision spare parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic flow diagram of the present invention. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0032] Example 1

[0033] A high-speed packaging material with a gold sand effect, which is composed of PP gold sand film, PET printing film (printed PET film), aluminized PET film (aluminized PET film, i.e., VMPET) and PE film from the outside to the inside; the PE film includes a corona layer, an intermediate layer and a heat sealing layer.

[0034] The formula of PE film is as follows:

[0035] The polyethylene layer includes a corona layer (9 μm), an intermediate layer (12 μm) and a heat seal layer (9 μm) in sequence.

[0036] The corona layer comprises: 12.5% ​​of a first low-density polyethylene and 87.5% of a linear low-density metallic polyethylene;

[0037] The middle layer comprises: 25% of the first low-density polyethylene, 55% of the linear low-density metallic polyethylene, and 20% of the high-density polyethylene;

[0038] The heat sealing layer comprises: 25% of the first metallocene polyethylene, 45% of the second metallocene polyethylene, 27% of the second low-density polyethylene, 1.7% of the anti-blocking agent, 1% of the slip agent and 0.3% of the fluorine-containing processing aid;

[0039] The first low-density polyethylene in the corona layer is BA-YPC 2420, and the linear low-density metallic polyethylene is 7042 from Yangzi Petrochemical; the first low-density polyethylene in the middle layer is BA-YPC 2420, the linear low-density metallic polyethylene is 7042 from Yangzi Petrochemical, and the high-density polyethylene is Exxon HMA025; the second low-density polyethylene in the heat-sealing layer is ExxonMobil 100AC, the first metallocene polyethylene is Exxon's 2012MA, and the second metallocene polyethylene is Dow's 1881. The anti-blocking agent is Beijing Aaron Zhilian AB-20LD, the lubricant is 10090-K, and the fluorine-containing processing aid is 100991-K.

[0040] The brand of PP gold sand film is the PP gold sand film produced by Shenzhen Jinjiang Company; the PET film in the PET printing film and the PET film in the aluminized PET film can be purchased on the market.

[0041] like Figure 1 As shown, a production process of a high-speed packaging material with a gold sand effect specifically includes the following steps:

[0042] S1. Printing process: printing on the surface of the PET film to obtain a PET printed film;

[0043] S2, aluminum plating process: the surface of the PET film is subjected to an aluminum plating process to obtain an aluminum-plated PET film;

[0044] S3, film blowing process: weighing the particles of each layer of PE film and subjecting it to film blowing process to obtain PE film;

[0045] S4. Composite process: PP gold sand film, PET printing film, aluminum-coated PET film and PE film are composited to produce packaging materials.

[0046] The performance and process parameters of the packaging materials are shown in Table 1 below:

[0047] Table 1

[0048]

[0049]

[0050] Comparative Example 1

[0051] Frosted PE / PET / VMPET / ordinary PE (When using this type of material, the packaging speed needs to be reduced to about 20 packs per minute)

[0052] The packaging materials prepared in Example 1 and Comparative Example 1 were subjected to performance tests, and the results are shown in Table 2 below:

[0053] Table 2

[0054]

[0055] As can be seen from Table 2 above, the heat sealing temperature range of the packaging material obtained in Example 1 of the present invention is between 105-145°C, the heat sealing area is wider, and the heat sealing strength is better. At the same time, this is closer to the melting point of PP gold sand film (generally 140-150°C), so that the appearance of the packaging material after packaging is better, and problems such as poor packaging appearance and false sealing will not occur. However, the heat sealing area of ​​the packaging material of Comparative Example 1 is narrow (110-130°C), which cannot meet customer needs. The packaging material prepared in Example 1 can achieve a packaging speed of up to 60 packages / min, which can meet the high-speed packaging requirements of customer equipment, while the packaging material of Comparative Example 1 has a packaging speed of only 20 packages / min, which cannot meet the high-speed packaging requirements.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-speed packaging material with a gold sand effect, characterized by: The packaging material is composed of a PP gold sand film, a PET printing film, an aluminized PET film and a PE film connected in sequence from the outside to the inside; the PE film comprises a corona layer, an intermediate layer and a heat-sealing layer, the corona layer comprises 12.5-15% of a first low-density polyethylene and 85-87.5% of a linear low-density metallic polyethylene, the intermediate layer comprises 20-25% of a first low-density polyethylene, 50-55% of a linear low-density metallic polyethylene and 20-30% of a high-density polyethylene, the heat-sealing layer comprises 20 -25% of a first metallocene polyethylene, 40-45% of a second metallocene polyethylene, 27-37% of a second low-density polyethylene, 1.2-1.7% of an anti-blocking agent, 1-1.2% of a slip agent, and 0.3-0.6% of a fluorine-containing processing aid; the corona layer is connected to the non-aluminum-plated surface of the aluminized film, the aluminized surface of the aluminized film is connected to the printing surface of the PET printed film, and the non-printing surface of the PET printed film is connected to the non-gold-sand surface of the PP gold sand film; the melting point of the PP gold sand film is 140-150°C.

2. The high-speed packaging material with a gold sand effect according to claim 1, characterized in that: The corona layer comprises 12.5% ​​of a first low-density polyethylene and 87.5% of a linear low-density metallic polyethylene; the middle layer comprises 25% of a first low-density polyethylene, 55% of a linear low-density metallic polyethylene and 20% of a high-density polyethylene; the heat-sealing layer comprises 25% of a first metallocene polyethylene, 45% of a second metallocene polyethylene, 27% of a second low-density polyethylene, 1.7% of an opening agent, 1% of a slip agent and 0.3% of a fluorine-containing processing aid.

3. The high-speed packaging material with a gold sand effect according to claim 1, characterized in that: The brand of the first low-density polyethylene is 2420 produced by BASF-YPC; the brand of the linear low-density metallic polyethylene is 7042 produced by Yangzi Petrochemical; the brand of the high-density polyethylene is HMA025 produced by Exxon; the brand of the second low-density polyethylene is 100AC produced by ExxonMobil; the brand of the first metallocene polyethylene is 2012MA produced by Exxon; the brand of the second metallocene polyethylene is 1881 produced by Dow Chemical Company; the brand of the anti-blocking agent is AB-20LD produced by Beijing Yalun Zhilian Co., Ltd.; the brand of the lubricant is 10090-K; and the brand of the fluorine-containing processing aid is 100991-K.

4. The high-speed packaging material with a gold sand effect according to claim 1, characterized in that: The PP gold sand film is produced by Shenzhen Jinjiang Company.

5. The high-speed packaging material with gold sand effect according to claim 1, characterized in that: The thickness ratio of the corona layer, the middle layer and the heat sealing layer is 3:4:

3.

6. The high-speed packaging material with gold sand effect according to claim 5, characterized in that: The thickness of the corona layer, the thickness of the intermediate layer and the thickness of the heat-sealing layer are 9 μm, 12 μm and 9 μm respectively.

7. A process for producing a high-speed packaging material with a gold sand effect according to any one of claims 1 to 6, characterized in that: The specific steps include: S1. Printing process: printing the inner surface of the PET film to obtain a PET printed film; S2, aluminum plating process: the surface of the PET film is subjected to an aluminum plating process to obtain an aluminum-plated PET film; S3, film blowing process: weighing the particles of each layer of PE film and subjecting it to film blowing process to obtain PE film; S4. Composite process: PP gold sand film, PET printing film, aluminum-coated PET film and PE film are composited to produce packaging materials.

8. The production process of a high-speed packaging material with a gold sand effect according to claim 7, characterized in that: The composite process in step S4 is a dry composite; after the PET printed film is composited with the aluminum-coated PET film, PET / VMPET is obtained, and the gluing amount is 2.5-3.2 g / ㎡, the first unwinding tension is 60 N, and the second unwinding tension is 70 N; after the PP gold sand film is composited with PET / VMPET, PP gold sand film / PET / VMPET is obtained, and the gluing amount is 3.8-4.2 g / ㎡, the first unwinding tension is 80 N, and the second unwinding tension is 70 N; after the PE film is composited with the PP gold sand film / PET / VMPET, the packaging material is obtained, and the gluing amount is 2.5-3.2 g / ㎡, the first unwinding tension is 60 N, and the second unwinding tension is 70 N.

9. The production process of a high-speed packaging material with a gold sand effect according to claim 7, characterized in that: The corona value of the non-golden sand surface of the PP gold sand film is 30-35 dynes. The non-golden sand surface of the PP gold sand film is subjected to online corona treatment, and the power of the corona machine is set to 20Kw; the corona value of the gold sand surface of the PP gold sand film is 38 dynes.

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