Containers , blow-molded

Hot-Fill Applications. A growing market for blow-molded containers is the so-called hot-fill market. This covers such items as tomato ketchup, pasteurized fmit juices, and salad dressings that are packaged while sti11 hot. The PET blow-molded bottie suffers from its relatively low T (70°C) which results in severe bottie distortion if the temperature of the contents approaches T (the maximum fill temperature is 60 65 C). A brief heat... 

Fig. 3-37 Example of an extrusion blow molded container with a living hinge.

Blow-molded containers, hot fill applications for, 20 50-52 Blow molded food packaging, 18 49-51 Blow-mold-fill-seal food packaging, 18 51 Blow molding, 10 179, 193-194 19 553-554 23 399 ABS, 1 427 HDPE, 20 171-172 LDPE, 20 237 LLDPE, 20 200... 

P.Y.212 is not recommended for exterior use, but provides an excellent value for interior applications such as packaging and household durables of all types. Pigment Yellow 212 is tinctorially quite strong as metallized azos go and exhibits very good dimensional stability, making it very useful in molded items such as blow molded containers. 

Blow molding (containers and lids, especially food bottles, auto gas tanks, motor oil bottles), 35% injection molding (pails, refrigerator food containers, toys, mixing bowls), 22% film, 17% pipe and conduit, 14% sheet, 6% wire and cable, 1% miscellaneous, 5%... 

Poly(butylene terephthalate) (PBT), because of the addition of two methylene units in the diol-derived portion, has a lower melting point than PET with a Eg of about 170°C (structure 4.49). Moldability of aryl polyesters has been improved through the use of PBT instead of PET or by use of blends of PET and PBT. These aryl polyesters are used for bicycle wheels, springs, and blow-molded containers. 

Nitrile rubber (NBR), a copolymer of 1,3-butadiene with 20-40% acrylonitrile, is noted for its oil resistance. More than 150 million pounds are produced annually in the United States. Applications include fuel tanks, gasoline hoses, and creamery equipment. Nitrile resin is made by copolymerizing acrylonitrile with about 20-30% styrene or methyl methacrylate in the presence of NBR or SBR rubber to yield a blend of the graft terpolymer and homocopolymer. Applications include extruded and blow-molded containers for household, automotive, and other products as well as some nonbeverage foods (spices, vitamins, candy). 

Packaging films (extruded, blown, and cast) are used in pressure-sensitive tapes and electrical applications and as replacements for cellophane and glassine films in liners for cereal boxes, wraps for snack foods, cigarettes, bread, and cheese. Blow-molded containers are used in applications where the higher use temperature of polypropene is needed (compared to HDPE), such as in packaging of syrups that are hot-filled. 

Ionomers are superior to ldpe in resistance to environmental stress cracking, but, because ionomers are more polar, they are not as useful as electric insulators. Blow-molded containers made from ionomers, unlike those made from lope or hope do not store static electricity and hence do not attract dust. 

Hot-Fill Applications. A growing market for blow-molded containers is the so-called hot-fill market. This covers such items as tomato... 

Extrusion. Sheet, film, and profiled articles are made by extrusion (20). The resin is melted and forced through a die plate or head. Variations include multilayer and blown film applications. In multilayer coextrusions, different combinations of plastics are separately but concurrently extruded to form layered sheet or film. In the packaging industry, specialty resins such as high barrier ethylene—vinyl alcohol copolymers are combined with heat- and impact-resistant thermoplastics for food packages. The properties of each resin layer are additive, as opposed to the "averaging of property" in blends. Multilayers are also used for blow-molded containers, films, and sheet products (see also Film AND sheeting materials). 

As expected, the largest portion of the cycle time is the cooling of the blow molded container in the mold cavity. Most machines work with multiple molds in order to increase production. Rotary molds are often used in conjunction with vertical or horizontal rotating tables (Fig. 3.59 [14]). 

C. J. S. Petrie and K. Ito, Prediction of Wall Thickness of Blow Molded Containers, Plast. Rubber Process., 5, 68-72 (1980). 

Other applications for THV are flexible liners (drop-in liners or bag liners), used in chemical process industries and other industries, and blow-molded containers, where it enhances the resistance to permeation when combined with a less expensive plastic (e.g., high-density polyethylene-HDPE), which provides the structural integrity.61 Optical clarity, excellent weatherability, and flexibility make THV suitable as a protection of solar cell surface in solar modules.63... 

Due to its particularly good polymer characteristics PVC has an enormously wide spectrum of applications. From the consumption of more than 5.5 x 106 t in Western Europe (1997), 60% is in the building field, with a tendency to rise. Blow molded containers for packaging liquid products (beverages, edible oils, detergents, cosmetics and pharmaceuticals) receive special consideration, as do dishes for fatty foods (highly... 

Defosse, M., Large Blow Molded Containers Take Off, MP, Apr. 2000. 

Other applications for THV are flexible liners (drop-in liners or bag liners), used in chemical process industries and other industries, and blow-molded containers. 

Level Control Filler. Plastic bottles can be manufactured clear thus for consumer appeal, they are filled to a level. This means the volume may vary but will appear to be equal due to the visually perceived common level in the containers. Flow is by gravity through a nozzle into a sealed container, whereas air equilibrates via a vent tube (Figure 8). When the rising liquid reaches the air vent port, flow stops. There is no overflow of product as in a pressure or pure vacuum filler. Aeration is at a minimum, perceived fill level is extremely accurate, and the filler is relatively simple and easy to maintain. Size consistency of the blow-molded container is critical to control, because this dictates the amount of product being sold. 

In comparison to sized molded containers from the blow-molded process, tubing process containers are made lighter in weight and provide more precisely controlled dimensions than blow-molded containers. The walls and bottom thickness are more uniform, and, hence, are more suited for use in automatic inspection systems. Clear and light-resistant glass compositions can be used in the tubing process. 

They may be extruded or blow molded. Parts may be thermally formed and heat or solvent welded. Some applications are blow-molded containers, pipe, ventilating ducts, and molded parts. 

PEEK), which has a glass transition temperature of 145°C and a heat deflection temperature for reinforced PEEK of 300OC. (31.)PEEK is being considered for use as blow molded containers for nuclear wastes, jet engine components, printed circuits, electrical applications and wire coatings. 

BLOW-MOLDED CONTAINERS. Initial evaluation of SELAR OH Plus in extruded blow molding containers was disappointing. Barrier improvements of only 30 to 401 were measured compared to the expected 300%.. The resolution of this discrepancy provided some valuable insights into the role of platelet orientation in barrier improvement and the effects of die swell in multilayer extrusion blow molding. 

Figure 3. Hydrocarbon (unleaded gasoline) permeability (weight loss, g) in blow molded containers from polyethylene (HDPE) and polyethylene/nylon blends. (Reprinted with permission from Ref. 1. Copyright 1984 Technical Association of Pulp and Paper Industry.)...

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