How many kinds of packaging bag materials are there for packaged food? What s the difference?

The materials are generally PE and PP.

The softness and mechanical properties of PE are worse than those of PP, and the representative products are shopping bags, plastic wrap, garbage bags and so on. PP is harder, anisotropic, has good mechanical properties, and has better high-temperature performance than PE, which is represented by bread bags.

Development History:1The commoditization of packaging itself is becoming more and more significant, and it has become a special product that is no longer dependent on commodity production, and a product that is widely used without all commodities.

2.Chinese scientists have developed an environmentally friendly plastic bag made of electrolyte, which can not only be harmlessly decomposed, but also dissolved in water.

3.According to scientists, it takes hundreds of years for products made of common polymer plastic materials in life to be completely decomposed, and will exist on the earth for hundreds of years. According to the actual figures, 80% of the used plastic bags are eventually transported to the garbage dump area for disposal like general garbage, and only 7% of the plastic is recycled.

This new eco-friendly plastic bag does not release harmful substances during the decomposition process, and can even be decomposed into natural substances that insects love, which greatly contributes to the protection of the natural environment.

The classification of packaging materials includes paper packaging materials, plastic packaging materials, composite flexible packaging materials, metal packaging materials, etc.

Packaging materials occupy an important position in the entire packaging industry, and are the basis for developing packaging technology, improving packaging quality and reducing packaging costs. Therefore, it is of great significance to understand the performance, application scope and development trend of packaging materials, to reasonably select packaging materials, expand packaging materials, adopt new packaging and processing technologies, create new packaging and packaging technologies, and improve the level of packaging technology and management.

Development prospects of packaging materials:

With the rapid development of China's economy and the improvement of people's quality of life, the demand for convenience foods such as microwave food, snack food and frozen food will continue to increase, which will directly drive the demand for related food packaging, and China's food and packaging machinery industry will maintain positive growth for a long time in the future.

By product classification, China's output of paper packaging products will reach 36 million tons by 2015, 9.46 million tons of plastic packaging products, 4.91 million tons of metal packaging products, 15.5 million tons of glass packaging products, and 1.2 million sets of packaging machinery. It is expected that in the future, the circular economy will become the main mode of development of the packaging industry, the utilization of packaging waste resources will be industrialized, and green packaging materials will be vigorously developed and developed.

The above content reference:

The specific classification of packaging materials is as follows: 1. Paper packaging materials: packaging paper honeycomb paper, paper bag paper, desiccant packaging paper, honeycomb cardboard, kraft paper industrial cardboard, honeycomb paper core; 2. Plastic packaging materials:

PP packing tape, PET packing tape, tear film, stretch film, sealing tape, heat shrinkable film, plastic film, hollow board; 3. Composite flexible packaging materials: flexible packaging, aluminized film, iron core wire, aluminum foil composite film, vacuum aluminized paper, composite film, composite paper, BOPP; Metal packaging materials: tinplate aluminum foil, barrel hoop, steel belt, packing buckle, blister aluminum, PTP aluminum foil, aluminum plate, steel buckle; 4. Ceramic packaging materials:

ceramic bottles, ceramic jars, ceramic jars, ceramic pots; 5. Glass packaging materials: glass bottles, glass jars, glass boxes; 6. Wood packaging materials: packaging made of wood products and artificial wood boards (such as plywood and fiberboard), such as wooden boxes, barrels, wooden boxes, wooden plywood, fiberboard boxes, plywood boxes and wooden pallets;

Other packaging materials Accessories: 1. Hot stamping materials: hot stamping materials, laser film, anodized aluminum hot stamping paper, hot stamping film, hot stamping film, hot stamping foil, hot stamping foil, color foil; 2. Adhesives and coatings

adhesives, adhesives, composite adhesives, reinforcing agents, starch adhesives, sealing adhesives, latex, resins, self-adhesives;

Packaging auxiliary materials: cap glove machine, mold, gasket, handle, liner nozzle, sealing cap, packaging film.

1. Paper packaging materials.

2. Plastic packaging materials:

3. Composite flexible packaging materials.

4. Iron packaging materials.

5. Ceramic packaging materials.

6. Wood packaging materials.

The materials used in common food packaging bags are divided into six categories:

1. Material: BOPP LLDPE two-layer composite.

Characteristics: moisture-proof, cold-resistant, low-temperature heat sealing tensile force.

Uses: instant noodles, snacks, frozen snacks, powder packaging, etc.

2. Material: BOPP CPP two-layer composite.

Characteristics: moisture-proof, oil-resistant, high transparency, good stiffness.

Uses: instant noodles, biscuits, candies, all kinds of light food.

3. Material: BOPP VMCPP composite.

Characteristics: moisture-proof, oil-resistant, oxygen insulation, shading, good stiffness.

Composite bags. Uses: all kinds of dry food, fried food, potato chips.

4. Material: BOPP VMPET LLDPE three-layer composite.

Characteristics: moisture-proof, oxygen-insulation, shading.

Uses: all kinds of food, rice snacks, snacks, tea.

5. Material: PET CPP two-layer composite.

Characteristics: moisture-proof, oxygen-insulation, fragrance retention, high temperature resistance.

Uses: Steaming, alcoholic food, aromatic food.

6. Material: PET PET CPP three-layer composite.

Characteristics: moisture-proof, high-temperature resistant, easy sealing.

Usage: powder packaging, soy sauce, liquid, shampoo.

Food packaging bag function:

Physical protection. Food stored in packaging bags should be protected from crushing, impact, vibration, temperature differences, etc.

Enclosure protection. The outer shell can keep the food out of oxygen, water vapor, stains, etc., and leakage prevention is also a necessary factor in the packaging design. Some packages include desiccant or oxygen absorber to extend shelf life.

Vacuum packaging or removing air from the pouch is also the main food packaging method. Preserving food clean, fresh, and safe during its shelf life is the primary function of the bag.

Same package. Tucking the same kind of small items into one package is a great way to save volume. Powders and granular objects need to be encapsulated.

Get the message across. Packaging and labels tell people how the packaging or food is used, transported, or handled.

Marketing. Marketing: Box labels are often used to encourage potential buyers to make a purchase. Packaging design has been a pivotal and ever-changing phenomenon for decades. Marketing communications and graphic design are applied to the outer box and (for some reasons) the highlights of the sales display.

Safe. Packaging can play an important role in reducing transport safety risks. Bags can also prevent food from being grouped into other products.

Food packaging also reduces the likelihood of food being stolen. Some food packaging is strong and has anti-counterfeiting markings, which are used to protect the interests of merchants from loss. The packaging bag can have laser logo, special color, SMS authentication and other labels.

In addition, in order to prevent theft, retailers affix electronic monitoring labels on food packaging bags, and wait for consumers to take them to the outlet of the store for demagnetization.

Convenient. Packaging may be available for easy addition, handling, stacking, display, sale, opening, reloading, use and reuse.

Partial control. Individual packages help you get a precise picture of the situation. For example, when salt is put into the package, you can know how much it is in stock. It's also easy to calculate sales, such as dairy company deliveries, milk bottles, rather than having consumers fill their own bottles.