Product features of plastic processing machinery
In plastic processing machinery, plastic processing fault often encounter all sorts of these faults, in terms of what in the plastics machinery industry in the expression is more accurate, here we have to analyze the terminology about plastic processing fault.UnderinjectionIn plastic processing, because the cavity filling is not satisfied, it leads to incomplete and incomplete appearance of the plastic parts.molding flashIn the plastic molding process, it spills into the gap between the die and the die surface and leaves the remaining material on the plastic parts.
As a result of pigment dispersion or poor mixing and other reasons, the plastic surface produces mica flake dark spot defects.Orange peelAn appearance defect such as an orange peel produced on the surface of a piece of plastic.Bubble streakFoam layer in a foam plastic that is distinguished from its natural pore structure.Black spotsIn the plastic molding process, the melt is decomposed at high temperature and high pressure, resulting in black carbide spots on the surface of the plastic parts.White spot or bright spotIn transparent or semi transparent plastic films, sheets or plastic parts, the particles are not fully plasticized and white dots are visible when light is transmitted. This is called a fish eye". If the material is opaque or colored, this particle is called a white spot or bright spot.
Weld LinesA linear trace plastic surface, by injection or extrusion of stream material in the desert with diversion confluence, melt at the interface is not completely fused each other, can not be fused into a whole, thus causing the fusion imprinting, affecting the appearance quality and the mechanical properties of plastic parts.Wave markBecause of the improper flow of the melt in the mold cavity, the surface of the plastic part has the defects of endless wave shape, spiral shape or cloud shape.Surface opacityA crack in the surface of a piece of plastic and the resulting breakage. For a long time or repeatedly applied stress is lower than the plastic mechanical properties of plastic parts caused by external or internal crack phenomenon called stress cracking; due to the constant load of plastic parts subjected to a certain time at a certain temperature and sudden end phenomenon known as the rupture rupture stress; some thermoplastic period pieces excessive exposure of crack under high temperature and cracking called thermal stress cracking.
fractureA visible crack in a laminated plastic over an outer layer or a few layers of reinforcing material through a surface covering resin layer.RufflingA defect in the surface of a laminated plastic that breaks and is markedly separated.FoldIn plastic processing, the appearance of creases or wrinkles on one or more layers of plastic surface.Chap albinoThe obvious micro cracks on the surface of the plastic parts are called cracks, and the fine micro cracks, similar to those of cracks, are called whitening, cracks and whitening are fine cracks without cracks. When a plastic part is exposed to a chemical environment or under stress conditions, environmental stress cracking occurs.Sliver MarksThe needle like silvery white of the surface of the plastic piece along the direction of the material flow, such as the downy fine lines.stripeA linear stripe defect in the surface or interior of a plastic part.
