The definition, performance and use of ten commonly used materials for flexible packaging such as BOPP, BOPA, BOPET and PVC are summarized. Newcomers to the flexible packaging industry can use it as a learning reference.
1. BOPP
Biaxially oriented polypropylene, with a density of 0.92 / cm3, is flammable. The flame is blue in the lower part and yellow in the upper part when burning, with a small amount of black smoke and oily smell.
Main performance:
1. Colorless and high transparency.
2. Excellent tensile strength, impact strength and stiffness.
3. Excellent cold resistance and heat resistance: -40 ~ 120 ℃.
4. The steam barrier performance is very good, and the oxygen barrier performance is poor.
5. It is generally used as printing material for highly transparent wild bags and composite bags.
use:
BOPP is the most commonly used packaging surface material, especially when the packaging requirements are not very high. The commonly used thickness is 18 ~ 48μm. Due to its superior vapor barrier properties, it is suitable for light packaging such as biscuits and snacks that easily absorb moisture.
Second, BOPA
After biaxially stretched nylon film, the density is 1.15g / cm3, flammable, and the smell of burning nails and wool when burning.
Main performance:
1. Resistant to oil and organic solvents, non-toxic, odorless, colorless and transparent.
2. Good printability, good tensile strength, abrasion resistance and needle stick resistance.
3. Large compressive strength.
4. It has good oxygen barrier performance, excellent cold resistance and heat resistance, and good oil resistance.
5. It is easy to absorb moisture, has greater air permeability, weak stiffness, and easy to wrinkle.
6. Good heat resistance and cold resistance (-60 ~ 140 ℃).
The main purpose:
It is used for packaging oil-fried food, frozen food, vacuum packaging, cooking and sterilization food, and dairy products. Commonly used for heavy packaging of puncture-resistant and frozen food.
3. BOPET
Biaxially oriented polyester film, density 1.4 g / cm3, flammable, there is a lot of black smoke when burning, and it will produce black fragments and smell of benzene.
Main performance:
1. High mechanical strength, strong strength and good impact resistance.
2. Good heat resistance and cold resistance, high temperature 240 ℃ is still stable.
3. Good oil resistance, excellent acid resistance and poor alkali resistance.
4. The oxygen and water vapor transmission rate is small, and the fragrance retention performance is excellent.
5. Good transparency to prevent poor UV transmission.
The main purpose:
Commonly used for making cooking bags and vacuum aluminum plating substrates, packaging light and heavy packaging such as broth, frozen food, rice cakes or tea.
4. PVC
Polyvinyl chloride film, density 1.39 g / cm3, transparent, flame-retardant, extinguishes immediately after fire, with pungent hydrochloric acid smell. It is divided into three categories: hard, semi-hard, and soft, which are distinguished by the content of plasticizer in the material. At present, most of them are kinked PVC and shrinkable PVC.
Main performance:
1. Good oil resistance.
2. Good transparency and surface gloss.
3. Good ink adhesion.
The main purpose:
Tablecloths, handbags, raincoats, sugar paper, bottle stickers, bottle envelopes and other packaging.
Five, extinction OPP
Bidirectionally stretched polypropylene matting film is a film with matting effect produced by coextrusion of matting material and polypropylene and bidirectional stretching.
Main performance:
It is a new type of packaging material with low reflectivity and translucent shape.
The main purpose:
Light packaging such as high-grade paper reshaping, gift bags, food packaging composite bags, etc.
Six, POPP
Bidirectionally stretched polypropylene pearlescent film, with a density of 0.7 g / cm3, is a film made of polypropylene by adding a certain amount of special pearlescent masterbatch and bidirectional stretching.
Main performance:
1. It has light-shielding properties to prevent food from ultraviolet rays.
2. Has a beautiful pearlescent luster.
The main purpose:
It is used for decorative light packaging such as biscuits, chocolates, ice cream and daily necessities.
Seven, KOP
Biaxially oriented polypropylene coated film with a density of 0.91 g / cm3. KOP is coated with polyvinylidene chloride (PVDC) on the surface of BOPP with a thickness of 1 ~ 2μm.
Main performance:
1. Has excellent moisture resistance and air tightness.
2. It has good chemical resistance, and is resistant to common organic solvents, acids, alkalis and salts.
3. Good odor transmission resistance.
4. Has heat shrinkage.
5. It can withstand boiling water at 100 ℃, and can be used to make sterilized food packaging bags.
The main purpose:
KOP has both the performance of OPP and the advantages of PVDC, excellent oxygen barrier and moisture barrier, and good chemical resistance. It has good permeability to prevent odors, and is often used for packaging light-weight packaging such as ham, sausage, fish and other foods containing protein and fat, and moon cakes.
8. PT
Cellophane, or cellulose film, also known as hydrated cellulose film, is a non-thermoplastic film. It is divided into three categories: ordinary cellophane, moisture-proof cellophane and plastic-coated cellophane.
Specific categories:
1. PT, ordinary cellophane (untreated, transparent)
2. WST, double-sided moisture-proof cellophane.
3. MT, moisture-proof on both sides, no heat-sealing cellophane.
4. MOT, single-sided moisture-proof cellophane.
5. MOST, single-sided moisture-proof, heat-sealing cellophane.
6. CPT, colored cellophane.
7. LPT, low moisture proof cellophane.
8. JPT, flame-resistant cellophane.
Main performance:
1. The printability is good, without any processing before printing.
2. It has extremely high transparency and glossiness, and the color after printing is extremely bright and eye-catching.
3. Non-toxic and tasteless, it is the best material for traditional candy packaging.
4. It has a certain stiffness, which can increase the appearance of the packaging.
5. Degradable materials can be degraded after being buried in the soil for four months.
6. The transverse and longitudinal tearing performance is very good.
The main purpose:
It is used for packaging light packaging such as candy, food, shirts, cigarettes, cosmetics and medicines.
Nine, PE
Polyethylene film, a film produced by blown film and casting process. Polyethylene prints have the common advantages of gravure prints, such as: excellent color reproduction, higher production efficiency, higher durability and relatively low processing costs; but surface printing films are not as bright as inline printing. Beautiful, bright colors, no fading, no fading, moisture-proof and wear-resistant, firm and practical, long shelf life, no adhesion, no cracking; and because the film ink printed on the inside is printed on the inside of the film (after compounding, the ink layer is sandwiched between Between two layers of film), it will not contaminate the packaging, and it is more in line with food hygiene requirements. Therefore, the film packaging with higher hygiene requirements is mostly used in India.
Main performance:
1. Surface treatment strength, PE surface tension is extremely low, it needs to be corona treated before printing, so the corona treatment strength is the key indicator of film printing.
2. Excellent mechanical properties, such as vertical and horizontal tensile strength, fracture productivity, etc., PE film has excellent tensile properties, easy to stretch deformation.
3. Various resistances, such as friction resistance, light resistance and solvent resistance.
4. Pay attention to the solvent residual characteristics of the films with high hygienic requirements.
The main purpose:
Used in flexible packaging, such as the packaging of hygiene products and cosmetics.
Ten, aluminum foil
Aluminum foil is foil paper made by rolling aluminum. Aluminum foil has metallic luster, good light shielding, and high reflectivity to heat and light. Metallic luster and reflection ability can improve the brightness of printed colors; good isolation, strong protection, air-impermeable body and water vapor, prevent the contents from absorbing moisture and vaporization, and not easy to be attacked by bacteria and insects; good shape stability, not subject to Effects of humidity changes. Easy to process, printing, embossing and surface coating on aluminum foil. However, aluminum foil can not be stressed, there is no sealing property, there are pinholes and easy to wrinkle, etc., so it is generally not used alone, usually processed into a composite material with paper and plastic film, which overcomes the shortcomings of no sealing property and isolates Sex and other advantages have also been fully utilized.
Aluminum foil has strong barrier property and poor absorption. The pressure makes the printing plate and aluminum foil surface contact with the largest area and force the ink to adhere. The ink is required to have strong adhesion and fast drying speed. Before selecting the ink on the machine, you must make small samples to check whether the hue and dryness meet the requirements.
Among the current packaging substrates, aluminum foil has the best barrier properties. In addition to pharmaceutical packaging, it is also used for trademarks and some high-end food packaging such as beer top labels and chocolate packaging. Compared with paper and plastic, aluminum foil has the characteristics of thin, brittle, and wrinkle-prone, and has higher requirements for printing equipment. It should pass through guide rollers as little as possible during the printing process.
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