CN110605892A

CN110605892A - Large-gram-weight liquid self-supporting bag packaging material and preparation method thereof

Info

Publication number: CN110605892A
Application number: CN201910920838.5A
Authority: CN
Inventors: 汪洋; 汪学文
Original assignee: Huangshan Novel Co Ltd
Current assignee: Huangshan Novel Co Ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2019-12-24

Abstract

The invention relates to a liquid self-standing bag packaging material with large gram weight and a preparation method thereof. The self-supporting bag packaging material comprises a first double-direction stretching nylon film, an aluminized polyester film, a second double-direction stretching nylon film and a polyethylene film; the polyethylene film comprises a corona layer, a middle layer and a heat sealing layer; the corona layer comprises a No. 2010HA metallocene polyethylene resin and a No. 5100G metallocene polyethylene resin; the middle layer comprises 2010HA metallocene polyethylene resin, 8656ML metallocene polyethylene resin and processing aid; the heat seal layer comprises a metallocene polyethylene resin with the brand number SP1520, a slipping agent and an opening agent. The self-standing bag packaging material is more excellent in compression resistance, drop resistance and barrier property compared with the existing packaging bag, and can meet the packaging requirement of a liquid washing product with a large gram weight of at least 3kg capacity.

Description

Large-gram-weight liquid self-supporting bag packaging material and preparation method thereof

Technical Field

The invention belongs to the field of packaging materials, and particularly relates to a large-gram-weight liquid self-standing bag packaging material and a preparation method thereof.

Background

The daily chemical industry of China develops to the present, a relatively complete product system is formed, and can be divided into detergents, surfactants, cosmetics, personal care products, toothpaste and the like, the product categories are complete day by day, and the market-oriented operation of the products is mature day by day. In recent years, the daily chemical industry of China always keeps a steady and rapid growth situation. The plastic flexible package occupies 80% of the daily chemical product packaging market, but in the field of liquid daily chemical product packaging of large-capacity laundry detergent, shampoo, shower gel and the like, particularly large gram weight packaging of more than 2kg, the main packaging form in the market is a PE blow-molded bottle, and a small part of the plastic flexible package is a common PET/BOPA/PE material self-supporting bag.

The PE blow molding bottle has high space occupancy rate and higher transportation and storage cost than bag packaging, and the PE blow molding bottle does not have the anti-falling performance of a soft plastic composite material due to being a single material and having no toughness, and has the risk of liquid leakage during transportation and shelf placement. On the other hand, bottle packaging often also requires re-labeling to display product information without the printed decorative flexibility of the composite film bag. Although the PET/BOPA/PE composite film self-supporting bag in the current market can partially overcome the risks, the structure has low moisture resistance and fragrance retention functions, and the problem of moisture and fragrance loss can be caused when the product is placed for a long time after being packaged and washed.

With the upgrading of life quality and consumption concept, daily chemical manufacturers hope that new packages bring cost saving, and meanwhile, the daily chemical manufacturers can fully keep the moisture and the fragrance of content products and have flexible printing and decorating functions to attract the eyes of consumers. Therefore, the color printing composite plastic soft package has wide application prospect in the application field of large-gram-weight liquid washing products.

Disclosure of Invention

In order to solve the technical problems, the invention provides a liquid self-standing bag packaging material with large gram weight. The self-standing bag packaging material is more excellent in compression resistance, drop resistance and barrier property compared with the existing packaging bag, and can meet the packaging requirement of a liquid washing product with a large gram weight of at least 3kg capacity.

In order to realize the purpose of the invention, the invention adopts the following technical scheme:

a liquid self-standing bag packaging material with large gram weight is characterized in that: the self-supporting bag packaging material comprises a first biaxially oriented nylon film, an aluminized polyester film, a second biaxially oriented nylon film and a polyethylene film which are sequentially subjected to dry compounding; the polyethylene film comprises a corona layer, a middle layer and a heat sealing layer;

the corona layer comprises a 2010HA metallocene polyethylene resin and a 5100G metallocene polyethylene resin in a mass ratio of (31-35) to (65-69); the intermediate layer comprises a 2010HA metallocene polyethylene resin with the mass ratio of (13-17) to (83-87) to (0.1-0.5), a 8656ML metallocene polyethylene resin with the mass ratio of (8656) and a processing aid; the heat sealing layer comprises (97-99) SP1520 metallocene polyethylene resin, 0.8-1.2) and (0.8-1.2) in mass ratio, slipping agent and opening agent.

According to a further technical scheme, the thickness of the first biaxially oriented nylon film is 15 micrometers, the thickness of the aluminized polyester film is 12 micrometers, the thickness of the second biaxially oriented nylon film is 15 micrometers, and the thickness of the polyethylene film is 170 micrometers; the thickness ratio of the corona layer to the intermediate layer to the heat-seal layer is 3:4: 3.

In the further technical scheme, the processing aid in the middle layer is 100991-K; the grade of the slipping agent in the heat sealing layer is 10090-K, and the grade of the opening agent in the heat sealing layer is AB20 LD.

Another object of the present invention is to provide a method for preparing the self-standing pouch packaging material, comprising the steps of:

step 1, primary compounding: printing a first biaxially oriented nylon film, and then performing dry compounding on the first biaxially oriented nylon film and the aluminized polyester film to form BOPA/VMPET with a composite structure;

step 2, secondary compounding: carrying out dry compounding on the BOPA/VMPET with the composite structure and the second biaxially oriented nylon film to form the BOPA/VMPET/BOPA with the composite structure;

step 3, compounding for three times: carrying out dry compounding on the BOPA/VMPET/BOPA with composite structure and polyethylene film to form the BOPA/VMPET/BOPA/PE with composite structure, namely the self-supporting bag packaging material;

the preparation process of the aluminized polyester film comprises the following steps:

step A, unwinding a polyester base film;

and B, performing evaporation treatment under a vacuum condition:

step B-1, plasma treatment: carrying out plasma treatment on the surface of the polyester base film by using a radio frequency plasma system, wherein the power of the radio frequency plasma system is 2-20kW, the magnetic field intensity is 20-80 gauss, and the frequency is 50-120 HZ; argon is used as plasma gas, and the introduction amount of the argon is 250 sccm;

step B-2, ionization oxidation deposition: heating the evaporation boat to 1400-1600 ℃, then sending the aluminum wire to the surface of the evaporation boat, and introducing oxygen with the purity of more than 99.9 percent into the upper part of the evaporation area; a microwave plasma system for ionizing oxygen and aluminum vapor is arranged above the evaporation zone, so that aluminum oxide is deposited on the surface of the polyester base film to form a bonding enhancement reaction layer; the oxygen input is 0.5-51/min, and the evaporation rate of aluminum is 3-10 g/min; the power of the microwave plasma system is 1.5-5kW, and the microwave working frequency is 2450 +/-50 MHz; then stopping introducing oxygen into the evaporation area, and depositing aluminum vapor on the surface of the enhanced bonding reaction layer to form an aluminum coating;

and step C, cooling and rolling to obtain the aluminized polyester film.

The invention has the beneficial effects that:

(1) the polyethylene film of the invention has the following innovation points:

the No. 2010HA metallocene PE resin in the corona layer is 6-carbon metallocene PE film blowing resin produced by Exxon company, and the blend of the resin and other particles can provide good processing performance; the 5100G metallocene PE resin in the corona layer is 8-carbon metallocene PE film blowing resin, and has the characteristics or the function of improving the impact strength of the film, so that the risk of bag breakage caused by dropping of a liquid-washed bag is reduced.

The grade 8656ML metallocene PE resin in the intermediate layer is a new generation 6-carbon metallocene PE resin of Exon company, and can provide excellent mechanical properties for the film;

the brand SP1520 metallocene polyethylene resin in the heat-sealing layer is low-temperature heat-sealing metallocene PE resin of Mitsui company, so that customers can obtain higher heat-sealing strength at lower heat-sealing temperature or at the risk of package pollution.

In common flexible packaging film materials, a biaxially oriented nylon film (BOPA) is a polar material, can meet the printing requirement, has higher toughness and can provide mechanical property guarantee; the VMPET film formed by vacuum aluminizing of PET has excellent moisture resistance and oxygen resistance; the polyethylene film (PE) designed by a special formula can provide the required heat sealing and mechanical property support.

The invention utilizes the advantages of the 3 film materials, combines the film materials into a composite material in a dry compounding way, and processes the composite material into a self-supporting bag, thereby meeting the liquid packaging requirement with the weight of more than 3kg and large gram.

(2) The thickness ratio of the corona layer to the intermediate layer to the heat-sealing layer of the PE film prepared by the invention is 3:4:3, and the PE film has the advantages that the composite performance of the corona layer, the mechanical performance of the intermediate layer and the heat-sealing performance of the heat-sealing layer can be balanced, and the mechanical and heat-sealing performances of the composite packaging bag are guaranteed.

(3) The general VMPET aluminized film has low aluminum layer adhesion, and has a delamination risk caused by aluminum layer transfer after being compounded with a BOPA film in a dry mode. The aluminum plating process adopted in the invention is a special aluminum plating process, the traditional aluminum plating process is to melt and evaporate an aluminum wire onto a PET (polyethylene terephthalate) substrate under the condition of vacuumizing to form a common VMPET film, the special aluminum plating process used in the invention is a new aluminum plating process developed forever in Huangshan, namely, the evaporation condition is not complete vacuumizing, but the oxygen flux is controlled to form an aluminum oxide ceramic coating on the PET substrate firstly, and then an aluminum layer is evaporated on the aluminum oxide coating, and the aluminum layer adhesion force can be improved to 6.5N/15mm from 2.5N/15mm of common VMPET by the technology. With the obvious improvement of the adhesive force of the aluminum layer, the peeling strength of the BOPA and the VMPET can be improved from 1.0N/15mm to 2.0N/15mm, so that stable mechanical properties are provided for the whole composite material, the self-standing bag packaging material is more excellent in compression resistance, drop resistance and barrier property compared with the existing packaging bag, and the packaging requirement of a liquid washing product with a large gram weight of at least 3kg capacity can be met.

Drawings

FIG. 1 is a schematic flow chart of the preparation method of the present invention.

Detailed Description

The technical scheme of the invention is more specifically explained by combining the following embodiments:

the source of the raw materials in the examples is shown in table 1 below:

TABLE 1

The preparation process of the polyethylene film comprises the following steps:

step 1, high-temperature plasticization: respectively adding the resins and the auxiliaries of the heat-sealing layer, the middle layer and the corona layer into corresponding hoppers according to the formula requirements, sequentially passing through a machine barrel and a die head of an extruder by an automatic feeding system, and heating and plasticizing at high temperature to obtain melts;

the high temperature plasticizing process parameters are shown in table 2:

TABLE 2

Step 2, extruding and film blowing: the melt is extruded from the die head to form a molten film after passing through the screen changer and the flange by the driving force generated by the screw threads when the screw rod of the extruder rotates and the traction force of the traction roller, and the molten film is blown out from the die opening;

extrusion parameters: the extrusion amount is 470 +/-50 kg/h, the traction speed is 15 +/-10 m/min, and the heating temperatures of the heat sealing layer, the middle layer and the corona layer in a die head area are all set to be 190 +/-5 ℃;

step 3, cooling and shaping: the film bubble is blown up to the herringbone clamping roller under the action of the traction roller, the film bubble is cooled through the internal and external air inlet of the air ring, and the film is cooled and shaped under the actions of bubble extinguishing and rotary traction of the herringbone clamping roller.

Cooling and setting parameters: the temperature of external cold air inlet is 21 +/-5 ℃, the temperature of internal cold air inlet is 19 +/-5 ℃, and the rotary traction convolution time is 18 +/-3 min;

step 4, measuring the thickness; the thickness limit deviation is 170 +/-8 mu m;

step 5, corona treatment; the corona power is 10 +/-0.5 Kw;

step 6, trimming and rolling: the rolling tension is 80 +/-10N.

Example 1

Polyethylene films and aluminized polyester films were prepared in advance, and the first biaxially stretched nylon film and the second biaxially stretched nylon film were purchased.

The polyethylene films were prepared according to the formulation of table 3 below in combination with the process sheets of table 2:

TABLE 3

Film layer	Formulation of	Thickness/mum
			Corona layer	2010HA:5100G＝33:67	51
Intermediate layer	2010HA 8656ML processing aid 15:85:0.3	68
			Heat-sealing layer	SP1520, slipping agent, and opening agent 98:1	51

The preparation process of the aluminized polyester film is as follows:

step A, unwinding a polyester base film;

and B, performing evaporation treatment under a vacuum condition:

step B-1, plasma treatment: carrying out plasma treatment on the surface of the polyester base film by using a radio frequency plasma system, wherein the power of the radio frequency plasma system is 10kW, the magnetic field intensity is 50 gauss, and the frequency is 80 HZ; argon is used as plasma gas, and the introduction amount of the argon is 250 sccm;

step B-2, ionization oxidation deposition: heating the evaporation boat to 1500 ℃, then conveying an aluminum wire to the surface of the evaporation boat, and introducing oxygen with the purity of more than 99.9% above an evaporation area; a microwave plasma system for ionizing oxygen and aluminum vapor is arranged above the evaporation zone, so that aluminum oxide is deposited on the surface of the polyester base film to form a bonding enhancement reaction layer; the oxygen input is 25/min, and the evaporation rate of the aluminum is 5 g/min; the power of the microwave plasma system is 3kW, and the microwave working frequency is 2450 MHz; then stopping introducing oxygen into the evaporation area, and depositing aluminum vapor on the surface of the enhanced bonding reaction layer to form an aluminum coating;

and step C, cooling and rolling to obtain the aluminized polyester film.

The free-standing pouch packaging material of the present invention was prepared as follows:

step 3, compounding for three times: and carrying out dry compounding on the BOPA/VMPET/BOPA with the polyethylene film to form the BOPA/VMPET/BOPA/PE with the composite structure, namely the self-standing bag packaging material.

Example 2

Polyethylene films and aluminized polyester films were prepared in advance, and the first biaxially stretched nylon film and the second biaxially stretched nylon film were also purchased.

The polyethylene films were prepared according to the formulation of table 4 below in combination with the process sheets of table 2:

TABLE 4

Film layer	Formulation of	Thickness/mum
			Corona layer	2010HA:5100G＝31:69	51
Intermediate layer	2010HA 8656ML processing aid 13:83:0.5	68
			Heat-sealing layer	SP1520, slipping agent, and opening agent 99:0.8:1.2	51

The preparation process of the aluminized polyester film is as follows:

step A, unwinding a polyester base film;

and B, performing evaporation treatment under a vacuum condition:

step B-1, plasma treatment: carrying out plasma treatment on the surface of the polyester base film by utilizing a radio frequency plasma system, wherein the power of the radio frequency plasma system is 2kW, the magnetic field intensity is 20 gauss, and the frequency is 50 HZ; argon is used as plasma gas, and the introduction amount of the argon is 250 sccm;

step B-2, ionization oxidation deposition: heating the evaporation boat to 1400 ℃, then conveying an aluminum wire to the surface of the evaporation boat, and introducing oxygen with the purity of more than 99.9% above an evaporation area; a microwave plasma system for ionizing oxygen and aluminum vapor is arranged above the evaporation zone, so that aluminum oxide is deposited on the surface of the polyester base film to form a bonding enhancement reaction layer; the oxygen introduction amount is 0.5/min, and the evaporation rate of aluminum is 3 g/min; the power of the microwave plasma system is 1.5kW, and the microwave working frequency is 2400 MHz; then stopping introducing oxygen into the evaporation area, and depositing aluminum vapor on the surface of the enhanced bonding reaction layer to form an aluminum coating;

and step C, cooling and rolling to obtain the aluminized polyester film.

Example 3

The polyethylene films were prepared according to the formulation of table 5 below in combination with the process sheets of table 2:

TABLE 5

Film layer	Formulation of	Thickness/mum
			Corona layer	2010HA:5100G＝35:65	51
Intermediate layer	2010HA 8656ML processing aid 17:87:0.1	68
			Heat-sealing layer	SP1520, slipping agent, and opening agent 99:1.2:0.8	51

The preparation process of the aluminized polyester film is as follows:

step A, unwinding a polyester base film;

and B, performing evaporation treatment under a vacuum condition:

step B-1, plasma treatment: carrying out plasma treatment on the surface of the polyester base film by using a radio frequency plasma system, wherein the radio frequency plasma system has the power of 20kW, the magnetic field intensity of 80 gauss and the frequency of 120 HZ; argon is used as plasma gas, and the introduction amount of the argon is 250 sccm;

step B-2, ionization oxidation deposition: heating the evaporation boat to 1600 ℃, then conveying an aluminum wire to the surface of the evaporation boat, and introducing oxygen with the purity of more than 99.9% above an evaporation area; a microwave plasma system for ionizing oxygen and aluminum vapor is arranged above the evaporation zone, so that aluminum oxide is deposited on the surface of the polyester base film to form a bonding enhancement reaction layer; the oxygen input is 51/min, and the evaporation rate of the aluminum is 10 g/min; the power of the microwave plasma system is 5kW, and the microwave working frequency is 2500 MHz; then stopping introducing oxygen into the evaporation area, and depositing aluminum vapor on the surface of the enhanced bonding reaction layer to form an aluminum coating;

and step C, cooling and rolling to obtain the aluminized polyester film.

The technical specifications of the free-standing pouch packaging material prepared in the above examples are shown in table 6 below:

TABLE 6

The current wrapping bag of the liquid washing product of daily use chemicals in the existing market, because material structural design limits, its withstand voltage and resistant performance is not enough, can often lead to the liquid washing product to take place the weeping problem at the in-process of packing transportation and storage, and the capacity is big more, and the risk is big more, and this has seriously influenced consumer to daily use chemicals manufacturer's brand image. The reasonable composite structure of the product, the special VMPET aluminum plating technology and the design of the PE formula of the product solve the liquid leakage risk of the existing packaging bag, and can also improve the barrier property of the packaging bag and prolong the quality guarantee period of the product. The invention can fill the application blank of the flexible packaging self-standing bag in the large-gram-weight liquid washing packaging market of more than 3 kg.

Claims

1. A liquid self-standing bag packaging material with large gram weight is characterized in that: the self-supporting bag packaging material comprises a first biaxially oriented nylon film, an aluminized polyester film, a second biaxially oriented nylon film and a polyethylene film which are sequentially subjected to dry compounding; the polyethylene film comprises a corona layer, a middle layer and a heat sealing layer;

2. A free-standing pouch packaging material as claimed in claim 1, wherein: the thickness of the first biaxially oriented nylon film is 15 micrometers, the thickness of the aluminized polyester film is 12 micrometers, the thickness of the second biaxially oriented nylon film is 15 micrometers, and the thickness of the polyethylene film is 170 micrometers; the thickness ratio of the corona layer to the intermediate layer to the heat-seal layer is 3:4: 3.

3. A free-standing pouch packaging material as claimed in claim 1, wherein: the processing aid in the middle layer is 100991-K; the grade of the slipping agent in the heat sealing layer is 10090-K, and the grade of the opening agent in the heat sealing layer is AB20 LD.

4. A method of making a free-standing pouch packaging material as claimed in any one of claims 1-3, comprising the steps of:

step A, unwinding a polyester base film;

and B, performing evaporation treatment under a vacuum condition:

and step C, cooling and rolling to obtain the aluminized polyester film.