Clamshell Blog

As the synthetic material has superior performance, which was large in the field of packaging applications. The biggest advantages of plastic packaging materials, is easily adjusted through a variety of methods of material properties to meet various needs; also be made of composite thin films and multilayer plastic bottles, light weight, unbreakable, easy to transport and carry. Transparent plastic packaging materials, clean, smooth, easy printing and decoration style may beautify the appearance of goods, improve merchandise display performance.

    Most plastics can be used in beverage and food packaging, which is the largest amount of low-cost polyolefins. Commonly used plastic types are: polyethylene, polyvinyl chloride, polypropylene, polyester, polyvinylidene chloride, and polycarbonate.

    Polyethylene (PE)

    Polyethylene is the world’s largest output of synthetic resin, is the largest consumption of plastic packaging materials, about 30% of plastic packaging materials.

    Low density polyethylene (LDPE) better transparency, flexibility, elongation rate and large, impact resistance and low temperature resistance than HDPE as excellent, in all kinds of packaging consumption is still large, but as a food packaging material of its obvious shortcomings.

    High-density polyethylene (HDPE) with high crystallinity, allowing a higher temperature, its hardness, air tightness, mechanical degree of chemical resistance are better, it made extensive use of blow molding bottles and other hollow container. Because of its high resistance to mineral oils, widely used to contain milk, milk products, packaged natural fruit juice and jam like the food. However, Paul Hong HDPE, poor food and drink should not be loaded for long. However, it can be used with good sealing performance characteristics as the inner layer of composite film materials. Such as two-story, three composite materials, has a large number of used beverage packaging, the United States using cellophane / adhesive / PE compound containing lemon juice bottle special.

    Polyvinyl chloride (PVC)

    PVC plastic can be divided into hardware products, software products and three types of paste products. Hardware products generally less than 5% of plasticizer, the soft products in up to 20% or more plasticizers.

    Rigid PVC with plasticizer for free or very little, the finished product without plasticizer the smell, and excellent mechanical strength, light weight, chemical stability, so containers made of PVC is widely used in beverage packaging. Using injection stretch blow bottle production of the PVC seamless line, sidewall thickness and can be used to contain carbonated drinks such as Coca Cola and so on.

    PVC material has been the safety of people’s concern. PVC resin used in packaging of vinyl chloride content of not higher than 1 × 10-6, 1 kg of PVC resin that is only allowed with 1 mg of vinyl chloride monomer and PVC resin production in this bottle to drink, in food testing no vinyl chloride monomer.

    Polypropylene (PP)

    High crystalline polypropylene film structure, permeability to polyethylene 1 / 4 to 1 / 2, transparent, smooth, high processing performance, widely used to prepare the fibers, molding products, mainly plastic film.

    Currently, with the air tightness and thermal co-coating of polypropylene film and other film, cellophane, paper, aluminum foil composite mass production of composite materials are used PP composite materials can be used for beverage packaging containers.

    Various types of PP have a common characteristic of static electricity, to solve this problem, usually in thin film coating anti-static agent or the anti-static agent mixing in the film. Tightness in the film coating good PVDC resins can improve the oxidation resistance of PP polyester (PET or PETP)

    PET is a good crystal, colorless and transparent, extremely tough materials. Glass appearance, odorless, tasteless, non-toxic, flammable, burning yellow flame with blue edges, good air tightness.

    PET expansion coefficient, low mold shrinkage, only 0.2%, is one-tenth of polyolefins, PVC and nylon relatively small, it is dimensionally stable products. Mechanical strength are the most, the expansion degree of similarity with the aluminum film strength 9 times for the polyethylene, polycarbonate and nylon 3 times the impact strength of the film is generally 3 to 5 times. While the film there are moisture and protect Hong properties.

Although PET has the advantage, but the more expensive film, sealing problems, static electricity easily, so rarely used alone, mostly with the seal of the common good of the resin coating made of composite films.

    Two axis extends PET bottle blow molding method, can give full play to the characteristics of PET, which has good transparency, high gloss surface, showing glassy appearance, is the most suitable plastic instead of glass bottles.

    PET bottle production has developed rapidly in recent years, heat-resistant PET bottles are widely used in tea drinks, juice drinks, canned drinks need heat.

    Polyvinylidene chloride (PVDC)

    PVDC is characterized by soft and breathable with a very low permeability performance, prevent odor by, fresh aroma and good performance, suitable for long-term preservation of food; acid, alkali, chemicals, and excellent resistance to oil, has a good shrink nature, suitable for sealing packaging, shrink packaging material is good.

    PVDC drawback is too soft, poor operating performance; crystalline strong, easy to crack perforation, poor resistance to aging; the monomer is also toxic, it is mainly used for coating materials or manufacturing of composite materials.

    PVDC often associated with paper, aluminum foil and other plastic film made of composite material or PVDC coating material. Obtained by solvent viscosity legitimate good combination. These composite materials have excellent moisture and oxygen barrier, sealing performance, but also easy to heat sealing, water suitable for packaging food.

    Polycarbonate (PC)

    PC is a colorless, transparent, bright and clean and plastic. As the PC non-toxic, no odor, prevent the ultraviolet through the performance and the performance is good aroma and moisture, temperature and a wide range of non-brittle fracture under the -180 ℃, 130 ℃ environment in the long-term use, it is an ideal food packaging materials.

    Using PC good impact resistance, easy molding characteristics, can be manufactured into bottles, cans and various forms of containers for packaging beverages, wine, milk and other liquid substances.

    PC biggest drawback is the stress cracking. In addition to use in production of high purity raw materials, strict control of various processing conditions, the use of internal stress of the resin modification, such as the small amount of polyolefin, nylon, polyester and other melt blending, can significantly improve the resistance to stress cracking resistance, water resistance .

Plastics are synthetic or natural polymer resin as the main material. After adding various additives, to a certain temperature and pressure with a scalable, can be fixed after cooling the shape of a class of materials. Natural or synthetic polymer resin molecules in the molten state, and around the uniform distribution of additive molecules in a process called plastination, having already achieved this process has been called plastination, and has not yet reached, is considered not plasticized.
Plastics according to their own performance to hours can be divided into: You can repeatedly melt forming can maintain their identity and the underlying thermoplastic and can only carry out a fusion of the thermosetting plastic two broad categories. According to their purpose for the use of a wide range of points can be divided into low prices, better overall performance of General Plastics, such as PE, PP, PVC, PS, and amino plastics have good physical and mechanical strength, it may replace the metal used in construction machinery engineering plastics, such as: ABS, nylon, polyester, POM, TPX-1 and so on. As well as in a fine performance, particularly a class of engineering plastics, such as: sex with a particularly good resistance to radiation, temperature, etc. The specialty plastics, such as: poly aryl sulfone, liquid crystal polymers. Thermoplastic resin according to the size of molecular crystal points, can be divided into amorphous thermoplastic polymers and two types of crystalline polymers.
The main characteristics of plastics are: first, the density of small, high specific strength, get a higher yield of the packaging that “the quality of the packaging unit of volume or package size. Second, most of the plastics chemical resistance is good, there are Good acid and alkali resistance, various types of organic-Rong agents, long-term placement, oxidation does not occur. Third, forming easy to consume less power than required for forming steel and other metal materials. Fourth, with good transparency, easy coloring nature. Fifth, has good strength, unit weight of the intensity of high-performance, impact resistance, easy modification. Sixth, the low processing costs. Seventh, excellent insulation.

The most basic material for the forming web is PVC or Polyvinyl Chloride. The principal advantages of PVC are the low cost and the ease of thermoforming. The main disadvantages are the poor barrier against moisture ingress and oxygen ingress; moreover PVC has a negative environmental connotation due to its chlorine content. In the case of blister packaging the PVC sheet does not contain any plasticizer and is sometimes referred to as Rigid PVC or RPVC. In the absence of plasticizers, PVC blisters offer structural rigidity and physical protection for the pharmaceutical dosage form. On the other hand, the blister cavity must remain accessible by the push-through effect and the formed web may not be too hard to collapse when pressed upon; for this reason the PVC sheet thickness is typically chosen between 200µ to 300µ depending on the cavity size and shape. Most PVC sheets for pharmaceutical blisters are 250µ or 0.250 mm in thickness. Typical values for the Water Vapor Transmission Rate (WVTR or MVTR) of a 250µ PVC film are around 3.0 g/m2/day measured at 38°C/90%RH and the Oxygen Transmission Rate (OTR) is around 20 cc/m2/day. In order to overcome the lack of barrier properties of PVC film, it can be coated with PVDC or laminated to PCTFE or COC to increase the protective properties. Multi-layer blister films based on PVC are often used for pharmaceutical blister packaging, whereby the PVC serves as the thermoformable backbone of the structure. Also, the PVC layer can be colored with pigments and/or UV filters. The European Pharmacopoeia (EP) references the requirements for PVC blister packs for pharmaceutical primary packaging in the monograph EP 3.1.11 “MATERIALS BASED ON NON-PLASTICISED POLY(VINYL CHLORIDE) FOR CONTAINERS FOR DRY DOSAGE FORMS FOR ORAL ADMINISTRATION”. In order to be suitable for pharmaceutical blister packs, the PVC formulation also needs to comply with the US Pharmacopoeia <661>; EU food legislation; US 21.CFR and Japanese food contact requirements.
Our products :Tri fold clamshell,Hardware Packaging & more is made by PVC