BLOW MOULDING

BLOW MOULDING. SLIDE REPORT AMMMAR HIDAYAT B MOHD NAWAWI 06DTP20F1016 PN.MAYA SOFA ISMAIL.

INTRODUCTION. manufacturing process for forming and joining together hollow plastic parts. It is also used for forming glass bottles or other hollow shapes. The blow molding process In general, there are three main types of blow molding: extrusion blow molding, injection blow molding, and injection stretch blow molding. The blow molding process begins with softening plastic, by heating, and forming it into a parison or, in the case of injection and injection stretch blow molding (ISB), a preform. The parison is a tube-like piece of plastic with a hole in one end through which compressed air can pass. The parison is then clamped into a mold and air is blown into it. The air pressure then pushes the plastic out to match the mold. Once the plastic has cooled and hardened the mold opens and the part is ejected. Water channels within the mold assist cooling..

ADVANTAGES OF BLOW MOULDING PROCESS. LOW TOOL AND DIE COST.

DISADVANTAGE OF BLOW MOULDING PROCESS. LIMITED TO HOLLOW PARTS.

DIFFERENCE BETWEEN BLOW MOULDING AND INJECTION MOULDING PROCESS.

MATERIAL. The materials used for blow moulding include Polyethylene (High Density, Low Density and Linear Low Density), Polypropylene, Polyethylene-Terephthalate (PET), and PVC . HDPE was created in the 1930s and used in high-frequency radar cables during World War II. It was introduced to the market commercially soon after. While its higher density versions yield a more rigid result, HDPE can vary in flexibility. Low-density grades of the thermoplastic are less stiff and the high-density grades have equally high crystallinity . Low-Density Polyethylene (LDPE) uses majorly revolve around manufacturing containers, dispensing bottles, wash bottles, tubing, plastic bags for computer components, and various molded laboratory equipments . The most popular application of low-density polyethylene is plastic bags ..