Company Name: Linyi Yongfeng Plastic Knitting Factory
Contact: Ms. Zhou / Mr. Wang
Address: No. 17, Row 7, Plastic Market, Lanshan District, Linyi City, Shandong Province
Functional characteristics of plastic packaging materials
▶ Physical machine functions well
▶ Good isolation
▶ Excellent chemical resistance
▶ Excellent processing adaptability
不 Not as strong as steel
不 Heat resistant metal and glass
部门 Sector plastics contain toxic monomers
▷ Easy to carry static electricity
艰 Difficult disposal of waste
Packaging rarely used plastics and their functions
1.Low density polyethylene (LDPE, LLDPE)
Polyethylene is a red waxy solid, semi-transparent, almost odorless and non-toxic. The large molecular chain of polyethylene is good and easy to crystallize. At room temperature, polyethylene is composed of departmental crystals and departmental amorphous bodies with high elasticity. Plastic woven cloth
Low density polyethylene has good processing performance and good transparency, but has poor air tightness, low tensile strength, low heat resistance temperature, chemical resistance and solvent resistance. Easily receives swelling of fats and makes the finished product sticky.
Blow-moulded bottles and extruded hoses are used for packaging of condiments and medicines; container accessories such as bottle caps and stoppers; various packaging films, containers and foam plastics.
Impact strength, stress cracking resistance are adjacent to high density polyethylene, while lightness, hardness and processing performance are between high density and low density polyethylene. Elongation and puncture resistance are the best among various polyethylenes.
It is particularly suitable as a packaging film. Its thickness can be reduced by 20% compared with low density polyethylene. It is a promising plastic packaging material.
2.High density polyethylene (HDPE)
Good strength and heat resistance, the lowest temperature can reach 120 ° C, poor transparency, elasticity and processing performance, poor gas barrier properties, low radiance, and need to be handled outside before printing.
Containers, pallets, large barrels are used for re-packaging of fresh milk and chemical products, bottles are packaged with yogurt, washing liquid bleach, bottle caps, stoppers and other container accessories.
3. Foamed polyethylene—EPE (commonly known as pearl cotton)
Divided into sheet, plate, pipe, rod and its sliced appearance.
It is generally practical to pack any shape of goods, especially anti-static buffer packaging for electronic products such as computers, televisions, stereos, speakers and other electrical appliances. EPE is environmentally friendly, featuring good elasticity and toughness. Can also be made of floating clothes, floating boards, travel bags, caps and so on.
4, polypropylene (PP) polypropylene
Polypropylene is the lightest one among general plastics. Its heat resistance is the highest among general plastics. It can be used for a long time at 100 ℃ ～ 120 ℃. High crystallinity, tensile strength and hardness are better than polyethylene, moisture resistance, water resistance and permeability to avoid odor are better, can be heat sealed. Excellent resistance to tortuous fatigue. This feature is used at 80 ° C for acids, alkalis, salts and most inorganic solvents such as polypropylene boxes.
Poor cold resistance, aging resistance, poor air tightness, unsuitable for low temperature applications, and easily affected by light and oxygen. It must be handled outside before bonding or printing.
Commonly used in the manufacture of turnover boxes for food, chemical products, cosmetics, food and beverages, beer, etc. Blow-molded bottles are used for packaging such as shampoo, cosmetics, ribbed bottle caps or buttons, woven bags and packaging films, Straps and foam cushioning materials.
Colorless and bright, tasteless and non-toxic, good coloring and printability, low water absorption, good dimensional stability, rigid and non-ductility. Resistant to inorganic acids, alkalis, salts, primary alcohols and their aqueous solutions, low impact strength, low hardness outside, easy to scratch and brush; poor moisture resistance and heat resistance, easy to be affected by many hydrocarbons, ketones, high-grade fatty acids Friends divided and hardened.
It is widely used in the manufacture of small packaging containers such as food, pharmaceuticals and daily necessities, such as boxes, cups, etc., and films for food packaging. In addition, it is also used in large quantities for the manufacture of cushioning materials for foam plastics, etc., and for cushioning and shock-proof packaging for instruments, meters, and electrical products.
6.Polyvinyl chloride (PVC)
Rigidity and hardness are good, heat resistance is poor, and the brightness can reach 76% to 82%. Machine strength, wear resistance, pressure resistance are excellent, moisture resistance, water resistance and tightness are excellent, can be heat sealed. Excellent printing performance and flame resistance. Resistant to strong acids, strong bases and non-polar solvents, easy to be corroded by polar inorganic solvents, contains toxic vinyl chloride monomers, and most of the plasticizers, stabilizers and other toxic materials are used for food and medicine Non-toxic auxiliaries shall be adopted for the product packaging of polyvinyl chloride, and the content of vinyl chloride monomer shall not exceed 1 ppm.
Manufacture of rigid packaging containers, transparent sheets and flexible packaging films. Polyvinyl chloride transparent tablets are thermoformed into various packaging containers, which are used in large quantities for food and pharmaceutical packaging. In addition, polyethylene can also be made into foam and cushioning materials.
7.Polyethylene terephthalate (PET)
Machine strength is exceptionally good, with good hardness, abrasion resistance and folding resistance, good heat resistance and cold resistance, with good moisture resistance, air tightness and excellent odor permeability prevention, weak acid and alkali And most solvents, good oil resistance, suitable for printing, not resistant to strong alkalis, strong acids, chlorinated hydrocarbons, etc. It also has a corrosive effect on it; it is easy to be electrostatic, and there is no proper way to avoid static electricity. The price is expensive.
It is important for the manufacture of packaging containers and films. Because of its superior air tightness, heat resistance and cold resistance, polyester films are practically used for packaging frozen foods and cooked foods. Polyester bottles are used in bulk for beverage packaging.
8.Polyvinylidene chloride (PVDC)
Slightly light brown toughness data, strong crystallinity, exceptionally good air tightness and moisture resistance to water vapor and gas transmission. Polyvinylidene chloride has good machine strength, strong acid, strong alkali and inorganic solvent, excellent oil resistance, self-adhesive, difficult to extinguish and have self-ignitability, poor aging resistance, easily affected by ultraviolet rays, easy to differentiate into hydrogen, Its monomers are also toxic. Therefore, the quality standards for food packaging should be strictly controlled.
Hard, not very clear horny material, tasteless and non-toxic, when burnt, there is a charred breath of wool.
Strong crystallinity, high melting point, oil resistance, resistance to common solvents, excellent machine performance. Expanded strength and impact resistance are significantly better than ordinary plastics, with good abrasion resistance, self-lubrication, and high resistance to tortuous fatigue, superior low temperature resistance, but poor low temperature stability. The air tightness is better than polyethylene and polypropylene, alkali resistance and dilute acid resistance, no static electricity, superior printing performance. Strong water absorption, high moisture permeability, poor dimensional stability at low temperatures, air tightness decreases sharply after water absorption, nylon is not resistant to formic acid, phenol and alcohols, and concentrated alkali can also corrode it.
It is important for soft packaging of food, especially for light food packaging. Nylon containers are also rarely used for packaging such as chemical reagents.
10.Polyvinyl alcohol (PVA)
It usually does not have water resistance, but it can be made water-resistant by heat treatment, aldehyde treatment, or adopting appropriate inorganic substances to crosslink molecular chains. With superior transparency and toughness, tasteless and non-toxic, excellent air tightness and fragrance retention, good machine strength, excellent stress cracking resistance, chemical resistance and oil resistance, without static electricity, printing Good performance and heat sealing. High water absorption, high moisture permeability, and easy to be corroded by solvents such as alcohols and esters. Plastic woven cloth
For food packaging, water-based polyvinyl alcohol can be used for measuring packaging of chemicals.
11.Ethylene-vinyl acetate copolymer (EVA)
Stress crack resistance, cold resistance, aging resistance and low temperature heat sealing are better than polyethylene, strong alkali, weak acid corrosion, film slippery and brittle, easy to adhere; low moisture resistance and low density polyethylene, and airtight Poor performance; poor heat resistance; susceptible to corrosion by strong acids and other inorganic solvents; soluble in aromatic or substituted hydrocarbons; poor oil resistance.
It is used in the manufacture of packaging films. Because of its good elasticity, it is actually used for wrapping and wrapping of pallets. Due to its excellent low-temperature heat-sealing properties, it is rarely used as a sealing layer for composite films and also used for manufacturing pharmaceutical and food packaging containers.
It is colorless, with a brightness of 80% to 90% and a refractive index of about 1.59. It is suitable for optical data. It has good moisture resistance and compactness, excellent fragrance retention, heat resistance, cold resistance, and convexity. Impact toughness, notch impact strength is the highest in thermoplastics guess. Small molding shrinkage, low water absorption, good dimensional stability, no static electricity, excellent insulation, dilute acid, oxidant, reducing agent, salt, aliphatic hydrocarbon, etc., excellent oil resistance. Signs of stress cracking easily; Poor resistance to tortuous fatigue; Poor heat sealability; Not resistant to alkalis, ketones, aromatic hydrocarbons, swell in many inorganic solvents and cause stress cracking.
It is mainly used for electrical insulation materials. It is important for packaging of food. It has excellent abrasion resistance and is suitable for packaging of hardware and pointed items.
Excellent elasticity, meeting the required density, softness, elongation and tightening strength, good chemical stability, resistance to many solvents and oils, abrasion resistance 20 times greater than natural sponge, excellent thermal insulation, sound insulation, shock resistance and Bonding, the price is higher.
Shock-resistant packaging or cushioning materials for precision instruments, precious items, crafts, etc.
14.Phenolic plastic (PF)
High machine strength, abrasion resistance and excellent electrical insulation performance, high temperature resistance, not easily deformed, resistance to some dilute acids, good oil resistance, poor elasticity, large brittleness, dark finished products, mostly black Or brown, colorless finished product, strong alkali and oxidizing acid can make it differentiate, with slight toxicity.
It is widely used as electrical insulation materials. Its use on packaging is heavy if it is used to make acid-resistant containers for bottle caps, boxes and glamour chemical products. Bottle caps made of phenolic plastic can withstand the torque of the capping machine and can remain sealed for a long time without loosening.
15.Urea-formaldehyde plastic (UF)
It has high hardness on the outside, has excellent light and suitable semi-brightness, and has good coloring properties. It can be made into various finished products with excellent surfaces and beautiful colors. It does not easily absorb dust. It has excellent electrical insulation and stable chemical properties. Sensitized with any inorganic solvent, excellent grease resistance, poor water resistance, easy water absorption and deformation, sterilization with steam, resistance to impact strength is slightly inadequate, alkali and strong acid corrosion resistance.
Used in the manufacture of elegant packaging boxes, cosmetic containers and bottle caps. Free toxic materials formaldehyde precipitate when immersed in acetic acid or 100 ° C rolling water, so it is not suitable for packaging food.
16.Melamine plastic (MF)
High strength, not easy to deform, smooth and firm on the outside, ceramic-like surface, tasteless and non-toxic, good colorability, can be made into various colorful finished products. Good heat and water resistance, good resistance to boiling water, acid, alkali and grease.
The price is better, it is mostly used to make food containers, and it can also be used to make exquisite food packaging containers.
17, PVC heat-shrinkable film
PVC heat shrinkable film, divided into two kinds of popular packaging film, color printing film.
Popular packaging film: practically used for various product outer packaging and combination packaging. The product features: good brightness, strong tightening rate, and easy to operate.
The packaged product can be sealed against moisture, insulation, light, firm and elegant. Color printing film, in addition to a variety of color printing labels, but also used for product bottles, boxes and packaging of the rotary seal heat sealing.
18.POF heat shrink film
POF shrink bags are environmentally friendly, and the consequences of vertical and horizontal tightening are good. They are mainly used for shrink packaging of gifts, stationery, and small hardware.
19.PET heat-shrinkable film
Adopting "polyester resin chips" is a domestically recognized "environment-friendly" heat-shrinkable packaging material. Its technical indicators, physical functions, utilization scale and application methods are close to the "PVC" heat-shrinkable film.
With the improvement of people's awareness of environmental protection, domestic products are slowly moving towards the needs of the domestic market. At present, "PET" heat-shrinkable film is the most ideal packaging material to replace "PVC". Plastic woven cloth
20.PE heat shrink film
PE heat-shrinkable film is divided into two types: hardcover type and single-piece type. It is practically used for automatic packaging of various products. The characteristics of this product: good toughness, not easy to destroy, can replace carton packaging.