CPP + PE composite packaging film and preparation method thereof

Abstract

The invention discloses a CPP + PE composite packaging film and a preparation method thereof. The CPP + PE composite packaging film is prepared from the following raw materials in parts by weight: white E8201V, an antistatic agent, polyethylene, high-density polyethylene, metallocene PE, linear low-density polyethylene (LLDPE) and low-density polyethylene (LDPE). According to the CPP + PE composite packaging film and the preparation method thereof, the CPP + PE composite packaging film with stable performance is prepared by optimizing key links such as raw material mixing, equipment selection and temperature control, the uniformity of raw material mixing is improved, the stability of the performance of a film material is ensured, proper film preparation equipment is selected, the temperature is accurately controlled, the quality and the performance of the film material are improved, and the production cost is reduced. By adding the nanoscale inorganic filler, the barrier property and the heat sealing property of the film material are further improved. By means of the technical effects, the packaging box has wide application prospects and practical value in the packaging industry.

Description

Technical Field

[0001] The invention relates to the technical field of packaging materials, in particular to a CPP+PE composite packaging film and a preparation method thereof. Background Art

[0002] With the development of the packaging industry, the performance requirements for packaging materials are getting higher and higher. CPP+PE composite materials combine the advantages of CPP and PE, and have good deformation resistance, tensile strength, barrier properties and heat sealing properties. However, the existing CPP+PE composite packaging film still has some problems in the preparation process, such as uneven raw material mixing, improper film making equipment selection, inaccurate temperature control, etc. These problems affect the performance and stability of the packaging film.

[0003] CPP film has good heat sealing properties but poor impact resistance, while PE film has good flexibility but poor barrier properties. Therefore, how to organically combine the advantages of different materials to develop a composite material with better comprehensive performance. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a CPP+PE composite packaging film and a preparation method thereof, which solves the problems of unstable performance caused by uneven mixing of raw materials, poor film material quality caused by improper selection of film making equipment, and decreased film material performance caused by inaccurate temperature control.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a CPP+PE composite packaging film, comprising the following raw materials in weight proportions: white E8201V, weight 7-9kg; antistatic agent, weight 0.3-0.5kg; polyethylene, weight 0.5-0.7kg; high-density polyethylene, weight 0.2kg; metallocene PE, weight 15kg; linear low-density polyethylene (LLDPE), weight 67.20kg; low-density polyethylene (LDPE), weight 9.6kg.

[0008] Preferably, the raw materials also include 2% of nano silicon dioxide filler and transparent zinc oxide.

[0009] Preferably, the raw materials also include nano fillers, such as nano montmorillonite and nano silicon dioxide.

[0010] Preferably, a method for preparing a CPP+PE composite packaging film comprises the following steps:

[0011] S1: The above raw materials are accurately weighed with an electronic scale and poured into a sealed mixing tank for at least 30 minutes of stirring and mixing to make them uniform for use;

[0012] S2: Select film-making equipment with smooth and undamaged die, and control the ratio of the die diameter of the equipment to the diameter of the pre-made film after blowing to be between 1:2.5-3;

[0013] S3: The temperature of each zone of the film-making equipment is preset within the range of 120-180 degrees Celsius and powered on for heating. After the highest temperature zone reaches the preset temperature and is kept warm for no less than 15 minutes, the equipment is turned on for film production;

[0014] S4: Slowly start the equipment, start the cooling fan after the material is discharged from the die, open the inflation valve to pull the film material upward, and then pass through the rollers and reel it up according to the film material route designed by the equipment to obtain CPP+PE composite packaging film.

[0015] Preferably, in S1, a stirring paddle is provided in the sealed mixing tank to improve the uniformity of the raw material mixing, and the mixing time is extended to 45 minutes to ensure that the raw materials are fully mixed.

[0016] Preferably, the ratio of the diameter of the die in S4 to the diameter of the prefabricated film after inflation is controlled to be between 1:2.5-3, thereby improving the tensile strength and elongation of the film material.

[0017] Preferably, a PID temperature control system is used in the preparation process to accurately control the temperature of each zone of the film-making equipment to ensure that the temperature fluctuation range is within ±2 degrees Celsius, thereby improving the performance stability of the film material.

[0018] (III) Beneficial effects

[0019] Compared with the prior art, the present invention provides a CPP+PE composite packaging film and a preparation method thereof, which has the following beneficial effects:

[0020] 1. The CPP+PE composite packaging film and its preparation method prepare a CPP+PE composite packaging film with stable performance by optimizing key links such as raw material mixing, equipment selection and temperature control, thereby improving the uniformity of raw material mixing, ensuring the stability of film material performance, selecting suitable film-making equipment and accurately controlling temperature, and improving the quality and performance of the film material.

[0021] 2. The CPP+PE composite packaging film and its preparation method further improve the barrier properties and heat sealing properties of the film material by adding nano-scale inorganic fillers. These technical effects make the present invention have broad application prospects and practical value in the packaging industry. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Embodiment 1:

[0024] A CPP+PE composite packaging film comprises the following raw materials in proportion by weight: white E8201V, weighing 7kg; antistatic agent, weighing 0.4kg; polyethylene, weighing 0.6kg; high-density polyethylene, weighing 0.2kg; metallocene PE, weighing 15kg; linear low-density polyethylene (LLDPE), weighing 67.20kg; and low-density polyethylene (LDPE), weighing 9.6kg.

[0025] A method for preparing a CPP+PE composite packaging film comprises the following steps:

[0026] S1: The above raw materials are accurately weighed with an electronic scale and poured into a sealed mixing tank for at least 30 minutes of stirring and mixing to make them uniform for use;

[0027] S2: Select film-making equipment with smooth and undamaged die, and control the ratio of the die diameter of the equipment to the diameter of the pre-made film after blowing to be between 1:2.5-3;

[0028] S3: The temperature of each zone of the film-making equipment is preset within the range of 120-180 degrees Celsius and powered on for heating. After the highest temperature zone reaches the preset temperature and is kept warm for no less than 15 minutes, the equipment is turned on for film production;

[0029] S4: Slowly start the equipment, start the cooling fan after the material is discharged from the die, open the inflation valve to pull the film material upward, and then pass through the rollers and reel it up according to the film material route designed by the equipment to obtain CPP+PE composite packaging film.

[0030] In S1, a stirring paddle is provided in the sealed mixing tank to improve the uniformity of the raw material mixing and at the same time extend the mixing time to 45 minutes to ensure that the raw materials are fully mixed.

[0031] According to the composition and preparation method of this embodiment, a CPP+PE composite packaging film was prepared. After testing, the film material had good deformation resistance, tensile resistance, barrier properties and heat sealing properties.

[0032] The test results are shown in the following table:

[0033] Test items 0.055 thick 0.06 thick Heat seal strength (N / 15mm) 15.04 14.29 Transverse tensile strength (MPa) 24.56 24.44 Transverse elongation at break (%) 788.67 875 Longitudinal tensile strength (MPa) 45.13 41.63 Longitudinal elongation at break (%) 558.16 641.04

[0034] Embodiment 2:

[0035] A CPP+PE composite packaging film comprises the following raw materials in proportion by weight: white E8201V, weighing 8kg; antistatic agent, weighing 0.45kg; polyethylene, weighing 0.65kg, high-density polyethylene, weighing 0.2kg; metallocene PE, weighing 15kg; linear low-density polyethylene (LLDPE), weighing 67.20kg; and low-density polyethylene (LDPE), weighing 9.6kg.

[0036] The raw materials also include 2% nano-silicon dioxide filler. In order to enhance the barrier and heat-sealing properties of CPP+PE composite packaging film, it is possible to consider adding nano-scale inorganic fillers, such as nano-silicon dioxide, which can fill the tiny pores in the film material and improve the barrier properties; at the same time, they can also increase the roughness of the film material surface and improve the heat-sealing properties.

[0037] A method for preparing a CPP+PE composite packaging film comprises the following steps:

[0038] S1: The above raw materials are accurately weighed with an electronic scale and poured into a sealed mixing tank for at least 30 minutes of stirring and mixing to make them uniform for use;

[0039] S2: Select film-making equipment with smooth and undamaged die, and control the ratio of the die diameter of the equipment to the diameter of the pre-made film after blowing to be between 1:2.5-3;

[0040] S3: The temperature of each zone of the film-making equipment is preset within the range of 120-180 degrees Celsius and powered on for heating. After the highest temperature zone reaches the preset temperature and is kept warm for no less than 15 minutes, the equipment is turned on for film production;

[0041] S4: Slowly start the equipment, start the cooling fan after the material is discharged from the die, open the inflation valve to pull the film material upward, and then pass through the rollers and reel it up according to the film material route designed by the equipment to obtain CPP+PE composite packaging film.

[0042] In S1, a stirring paddle is provided in the sealed mixing tank to improve the uniformity of the raw material mixing and at the same time extend the mixing time to 45 minutes to ensure that the raw materials are fully mixed.

[0043] According to the composition and preparation method of this embodiment, a CPP+PE composite packaging film was prepared. In this embodiment, through comparative testing, the performance stability of the film material was significantly better than that of the film material prepared by the basic scheme.

[0044] Embodiment three:

[0045] A CPP+PE composite packaging film comprises the following raw materials in proportion by weight: white E8201V, weighing 8kg; antistatic agent, weighing 0.45kg; polyethylene, weighing 0.65kg; high-density polyethylene, weighing 0.2kg; metallocene PE, weighing 15kg; linear low-density polyethylene (LLDPE), weighing 67.20kg; and low-density polyethylene (LDPE), weighing 9.6kg.

[0046] The raw materials also include 2% nano-silicon dioxide filler. In order to enhance the barrier and heat-sealing properties of CPP+PE composite packaging film, it is possible to consider adding nano-scale inorganic fillers, such as nano-silicon dioxide, which can fill the tiny pores in the film material and improve the barrier properties; at the same time, they can also increase the roughness of the film material surface and improve the heat-sealing properties.

[0047] The raw materials also include 0.5 kg of nano-montmorillonite as a nano-filler to improve the barrier performance of the composite material.

[0048] A method for preparing a CPP+PE composite packaging film comprises the following steps:

[0049] S1: The above raw materials are accurately weighed with an electronic scale and poured into a sealed mixing tank for at least 30 minutes of stirring and mixing to make them uniform for use;

[0050] S2: Select film-making equipment with smooth and undamaged die, and control the ratio of the die diameter of the equipment to the diameter of the pre-made film after blowing to be between 1:2.5-3;

[0051] S3: The temperature of each zone of the film-making equipment is preset within the range of 120-180 degrees Celsius and powered on for heating. After the highest temperature zone reaches the preset temperature and is kept warm for no less than 15 minutes, the equipment is turned on for film production;

[0052] S4: Slowly start the equipment, start the cooling fan after the material is discharged from the die, open the inflation valve to pull the film material upward, and then pass through the rollers and reel it up according to the film material route designed by the equipment to obtain CPP+PE composite packaging film.

[0053] In S1, a stirring paddle is provided in the sealed mixing tank to improve the uniformity of the raw material mixing and at the same time extend the mixing time to 45 minutes to ensure that the raw materials are fully mixed.

[0054] The ratio of the die diameter in S4 to the diameter of the prefabricated film after blowing is controlled between 1:2.5-3, thereby improving the tensile strength and elongation of the film material.

[0055] In this embodiment, it is found through testing that the barrier properties and heat sealing properties of the film material are significantly improved.

[0056] Embodiment 4:

[0057] A CPP+PE composite packaging film comprises the following raw materials in proportion by weight: white E8201V, weighing 5kg; transparent zinc oxide 2.5kg; antistatic agent, weighing 0.4kg; polyethylene, weighing 0.6kg; high-density polyethylene, weighing 0.2kg; metallocene PE, weighing 15kg; linear low-density polyethylene (LLDPE), weighing 67.20kg; and low-density polyethylene (LDPE), weighing 9.6kg.

[0058] The raw materials also include 2% nano-silicon dioxide filler. In order to enhance the barrier and heat-sealing properties of CPP+PE composite packaging film, it is possible to consider adding nano-scale inorganic fillers, such as nano-silicon dioxide, which can fill the tiny pores in the film material and improve the barrier properties; at the same time, they can also increase the roughness of the film material surface and improve the heat-sealing properties. Transparent zinc oxide can improve the transparency of the composite material.

[0059] A method for preparing a CPP+PE composite packaging film comprises the following steps:

[0060] S1: The above raw materials are accurately weighed with an electronic scale and poured into a sealed mixing tank for at least 30 minutes of stirring and mixing to make them uniform for use;

[0061] S2: Select film-making equipment with smooth and undamaged die, and control the ratio of the die diameter of the equipment to the diameter of the pre-made film after blowing to be between 1:2.5-3;

[0062] S3: The temperature of each zone of the film-making equipment is preset within the range of 120-180 degrees Celsius and powered on for heating. After the highest temperature zone reaches the preset temperature and is kept warm for no less than 15 minutes, the equipment is turned on for film production;

[0063] S4: Slowly start the equipment, start the cooling fan after the material is discharged from the die, open the inflation valve to pull the film material upward, and then pass through the rollers and reel it up according to the film material route designed by the equipment to obtain CPP+PE composite packaging film.

[0064] In S1, a stirring paddle is provided in the sealed mixing tank to improve the uniformity of the raw material mixing and at the same time extend the mixing time to 45 minutes to ensure that the raw materials are fully mixed.

[0065] The ratio of the die diameter in S4 to the diameter of the prefabricated film after blowing is controlled between 1:2.5-3, thereby improving the tensile strength and elongation of the film material.

[0066] During the preparation process, a PID temperature control system is used to accurately control the temperature of each zone of the film-making equipment to ensure that the temperature fluctuation range is within ±2 degrees Celsius, thereby improving the performance stability of the film material.

[0067] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A CPP+PE composite packaging film, characterized in that: The invention comprises the following raw materials in proportion by weight: white E8201V, weighing 7-9kg; antistatic agent, weighing 0.3-0.5kg; polyethylene, weighing 0.5-0.7kg; high-density polyethylene, weighing 0.2kg; metallocene PE, weighing 15kg; linear low-density polyethylene (LLDPE), weighing 67.20kg; and low-density polyethylene (LDPE), weighing 9.6kg.

2. The CPP+PE composite packaging film according to claim 1, characterized in that: The raw materials also include 2% of nano silicon dioxide filler and transparent zinc oxide.

3. The CPP+PE composite packaging film according to claim 1, characterized in that: The raw materials also include nano fillers, such as nano montmorillonite and nano silicon dioxide.

4. The method for preparing a CPP+PE composite packaging film according to claim 1, characterized in that: The following steps are involved: S1: The above raw materials are accurately weighed with an electronic scale and poured into a sealed mixing tank for at least 30 minutes of stirring and mixing to make them uniform for use; S2: Select film-making equipment with smooth and undamaged die, and control the ratio of the die diameter of the equipment to the diameter of the pre-made film after blowing to be between 1:2.5-3; S3: The temperature of each zone of the film-making equipment is preset within the range of 120-180 degrees Celsius and powered on for heating. After the highest temperature zone reaches the preset temperature and is kept warm for no less than 15 minutes, the equipment is turned on for film production; S4: Slowly start the equipment, start the cooling fan after the material is discharged from the die, open the inflation valve to pull the film material upward, and then pass through the rollers and reel it up according to the film material route designed by the equipment to obtain CPP+PE composite packaging film.

5. The method for preparing a CPP+PE composite packaging film according to claim 4, characterized in that: In the S1, a stirring paddle is arranged in the sealed mixing tank to improve the uniformity of the raw material mixing and at the same time extend the mixing time to 45 minutes to ensure that the raw materials are fully mixed.

6. The method for preparing a CPP+PE composite packaging film according to claim 4, characterized in that: The ratio of the diameter of the die in S4 to the diameter of the prefabricated film after inflation is controlled to be between 1:2.5-3, thereby improving the tensile strength and elongation of the film material.

7. The method for preparing a CPP+PE composite packaging film according to claim 4, characterized in that: The PID temperature control system is used in the preparation process to accurately control the temperature of each zone of the film-making equipment to ensure that the temperature fluctuation range is within ±2 degrees Celsius, thereby improving the performance stability of the film material.