Application of polypropylene in industrial design
In the discussion of the identification and application of polymers in industrial design, polypropylene plastic (Polypropylene) which is called PP for short, is considered as one of the most significant materials which, in addition to its wide application in product design, is also used in the field of packaging production. has been used.
Polypropylene Polypropylene belongs to the family of thermoplastic or thermoplastic plastics in the sense that it becomes softer by receiving heat; Therefore, at the time of injection into the mold, it is necessary to heat the body of the mold by heating elements so that the melt flows, and then by passing the cooling fluid in the body of the mold, the injected body hardens and finally separates from the mold. This plastic, as a rule, has the ability to withstand heat up to 110 degrees Celsius.
Among the characteristics that help to identify this polymer among other samples is the non-scratchability of its surface with nails and its resistance to crushing, although it will turn white due to excessive force of bending tolerance. hit
Among the general characteristics of polypropylene plastic, the following can be listed:
● High resistance to acids, bases and fats;
● Reasonable price;
Ease of molding for injection production and acceptable fluidity in the mold;
● The ability to mix with fillers such as sawdust and create composites;
● relative non-toxicity and suitability for making toys and accessories for children;
● product availability and non-strategic;
● production of raw material by domestic factories;
● Excellent coloring by different masterbatches;
● thermal welding capability;
● thermal welding capability;
● Can be combined with core and metal bushings during injection.
Polypropylene is usually used in one of the following ways in industrial design:
A- Structured and non-transparent (matte or glossy);
B- Structured and semi-transparent (usually gray and non-glossy);
C- BOPP film;
d- OPP or CPP film.
Polypropylene, in addition to granules and sheets, can also be used in film form. Film, in general, is a very thin layer of fluid or solid, for example, oil film between bearing balls, or cellulose acetate film for recording and replaying cinematic images; And what is meant by polypropylene film is a thin layer of it that has a solid state. Polypropylene film is produced in two general forms, BOPP and OPP or CPP.
The first type, which is called BOPP or biaxially oriented polypropylene, means that during production, in addition to the layer being extruded in a cascade manner, it is also stretched from the sides, which is dimensionally stable compared to the second type, OPP or CPP. and has more heat during printing and packaging. The main application of polypropylene films is in the production of flexible packaging, such as chips, snacks, biscuits, ice cream, pasta, etc., which can be laminated, single-layer, metallized, etc. are used
The best and most practical way to identify this plastic among other samples is to remember the visual, audio and sound characteristics of a product made with this material, for this purpose, a list of products made with polypropylene is given below. to be:
Lego brand toy modular construction parts, threaded caps of pharmaceutical and sanitary wide opening plastic containers whose body is made of polyethylene (HDPE), magic body, automatic cap, tetrapack packaging cap, bottle cap, etc. Mineral water bottle, the body of these bottles is PET (Polyethylene Triphthalate), car battery body, Cartonplast brand extruded layers, and CD packaging cylindrical boxes.