Inventory: the terminology you must know in the plastics industry is here
Weld mark / water mark / line / clip
In the process of injection molding, when the two streams meet, the traces caused by the incomplete fusion of the world surface.
Shrink/shrink
When the plastic parts are cooled and solidified in the cavity, the plastic parts are recessed due to uneven wall thickness, insufficient injection pressure, insufficient cooling time, and the like.
Gas pattern
Due to the injection mold structure, molding process and materials, etc., the plastic is affected by the pressure and the flow velocity in the cavity and the flow traces are generated on the surface of the plastic part.
Flower / flower
Silver-white stripes formed on the surface of plastic parts by low molecular weight volatiles, moisture, etc.
White/white/white/white/high
The plastic part is partially subjected to external pressure, causing some molecular structures to be rearranged or broken, causing partial whitening of the surface of the plastic part.
Surface protrusion / top height / convex height / drag height
The plastic part is partially raised due to the out-of-mold or the ejector pin and the top plate acting on the surface of the plastic part.
Cracking/explosion/broken/pull
A crack in a plastic part that is locally affected by pressure, external force, or environment.
Mottled dots / black dots / spots / grams / stamp
Because the raw material is mixed with foreign matter or the local temperature is too high during the molding process, the rubber is carbonized, so that the plastic part forms a spot on the surface after molding.
Mold mark / mold flower / stamp / mold injury
Due to the scratches and bumps on the surface of the injection mold, the marks left on the production during molding.
Flash/blind
During the injection molding process, the plastic overflows into the joint surface of the injection mold and the joint between the inserts, and remains on the plastic parts after cooling.
Bad glue / lack of glue
The plastic parts were partially dissatisfied and did not meet the design requirements.
Color unevenness/color mixing
Defects in uneven color on the surface of plastic parts.
Warpage/deformation
Partial or overall deformation of the plastic part caused by internal stress.
Layering/peeling
Defects in separation between layers.
Hole plug / plug hole / blind hole
The hole position of the plastic part is blocked by the hole or broken needle, and the hole is more than 50% blocked.
Bubble/bubble/bubble
A bubble-like defect formed in the interior or surface of a plastic part due to residual air or other gas.
Color does not match / color difference / color depth / color light / gloss difference
The color and gloss of the plastic parts do not match the standard board.
Multi-glue
Due to the lack of molding surface of the injection mold, etc., the plastic parts are partially glued out.
Charred / burnt yellow / burnt black
Due to the poor high temperature of the injection mold, the local high temperature is generated, and the plastic material is degraded to form a burnt shape; or the shear rate of the rubber material during the flow is too high to cause degradation and form a burnt shape.
Fish-scale pattern
A fish scale pattern formed on a plastic part due to the low mold temperature and low speed of the gel.
Rubber/offset
Due to the high temperature of the nozzle and the large back pressure, the wire-like rubber is pulled out during the mold release, and is attached to the cavity, and the wire is formed on the surface of the product during the production of the beer.
Sticker/adhesive
Due to the large injection pressure and small drafting angle, the plastic part is partially broken and left in the injection mold when the mold is released.
Leak watermark
Due to leakage of the injection mold water channel, water droplets and water marks are not removed in the injection mold, and traces are formed on the surface of the plastic part when the beer is produced.
Ghosting
Due to the low injection temperature, unsaturated plastic parts, product deformation, etc., the phenomenon of light and shadow overlap occurs during the light transmission test.
Break
Refers to the unevenness of the surface after the fittings are matched, and the height difference formed.
Separation
Refers to the distance between the fittings after the fitting (excluding the design process tank).
White/white mark
White spots or white marks formed on the surface of the plastic part due to poor quality of the toner, the film left in the thimble being ejected, and the metal in the raw material.
Large size / long size
Due to the short injection time, the inconsistent shrinkage rate of raw materials, etc., the size of the plastic parts is larger than the required size.
Small size / short size
Due to the small pressure of the injection glue, the short holding time and the inconsistent shrinkage rate of the raw materials, the size ratio of the plastic parts is required.
Poor assembly / trial tight / trial loose / buckle tight / buckle loose / noisy
Among the components that cooperate with each other, there are problems of large size and small size, which causes problems such as tightness, looseness, and noise during trial assembly. Such problems are collectively referred to as poor assembly.
Pillar explosion
The studs burst or become violent when the screws are screwed.
Sliding teeth
Do not press the screw when the torque is specified.
Dragging
A matte, non-depth impression of the surface of the plastic part due to slight mechanical friction.
Plastic performance term
density
The ratio of the mass of a plastic to its volume is called density. Common units are g/cm3 or l/m3. Sometimes the ratio of the mass of plastic at 20 ° C to the mass of the same volume of water at 4 ° C is called the relative density of plastic, or specific gravity.
Tensile strength and elongation at break
The plastic sample is stretched at a certain speed, and the maximum tension required when the sample is broken is called the breaking force. At this time, the tensile breaking force on the cross-sectional area of ​​the sample is called the tensile strength. The unit is Pa. In the past, the commonly used unit was kgf/mm2, and the percentage (%) of the length increase when the sample was broken was called elongation at break, which is called elongation.
Glass transition temperature
The temperature at which the plastic changes from a highly elastic state to a glassy state. The unit is °C. There are usually no very fixed values, depending on the method and conditions of the splatter. Above this temperature. The plastic is elastic; below this temperature it is brittle.
Softening temperature
The temperature at which the plastic begins to soften when heated. The unit is °C. It is related to the molecular weight, structure and composition of the plastic. The measurement methods are different and the results are different.
Crosslinking degree
The process of turning a plastic linear structure molecule into a molecule having a bridge structure is called cross-linking. The physical quantity indicating the degree of crosslinking is called the degree of crosslinking.
The melt flow rate
MFR, also known as melt index MI. The number of grams of molten plastic extruded from a certain cavity every 10 minutes at a certain temperature and pressure. The unit is g/10min.
Volume resistivity
Under the action of an electric field, the volume of a 1 m3 cube of plastic relative to the volume between the two faces is the resistance generated by the leakage current. The commonly used symbol Ï is in Ω. m. used in the past Ω. Cm is a unit of volume resistivity and the conversion relationship is 1 Ω. m = 100 Ω. Cm. The higher the volume resistivity, the better the insulation performance.
Surface resistivity
Under the action of an electric field, the surface area is a resistance of the leakage current generated by a square of 1 m2 square plastic relative to the surface of the two sides. Commonly used symbol Ïs, the unit is Ω. Cm. The higher the surface resistivity, the better the insulation performance.
Relative permittivity
The ratio of the capacitance of a plastic as a dielectric to a vacuum in the same capacitor indicates the relative ability of the plastic to store electrostatic energy in an electric field. Commonly used symbol εr. In engineering, the relative dielectric is often referred to as "dielectric constant", which is dimensionless.
Dielectric loss
The energy loss caused by plastic under the action of an alternating electric field. The smaller the dielectric loss, the better the insulation performance. Usually measured by the dielectric loss tangent, the symbol tg δ. The smaller the value, the smaller the dielectric loss. Close to the rate of inclination.
Breakdown field strength
The breakdown field strength is an abbreviation for the arc of the breakdown electric field. A voltage is applied to the plastic. When a certain value is reached, the plastic loses its insulating properties and is broken down. This value is called the breakdown voltage of the plastic. The ratio of the breakdown voltage to the thickness of the plastic is called the breakdown field strength. Common symbol E, unit MV/m. The higher the breakdown field strength, the better the insulation performance.
Leakage resistance
The phenomenon that the plastic surface is charred due to the leakage current is called a leakage trace. The ability of plastics to resist the effects of leakage marks is called leakage tracking.
Corona resistance
In a region where the electric field strength is high in a non-uniform electric field, the phenomenon that the surface of the charged body causes partial discharge of the gaseous medium is called corona. In this case, plastics can cause cracking and deteriorate physical and mechanical properties and electrical insulation properties due to the impact of ions and ozone, heat, etc. The ability of plastics to resist corona is called corona resistance.
Oxygen Index
The minimum oxygen concentration required to maintain the flaming combustion of the plastic is indicated by the volume percent concentration of oxygen. Symbol OI or LOI. The higher the oxygen index, the harder it is to burn plastic. Plastics with an oxygen index of less than 21 are flammable materials.
Flash point, ignition point and spontaneous ignition point
The temperature at which the plastic is thermally decomposed to generate a flash of flammable gas in contact with an open flame is called a flashing temperature, which is simply referred to as a flash point. The temperature at which a plastic is thermally decomposed to generate a flammable gas and can be ignited by a fire is called a fire temperature, which is simply referred to as a ignition point or a fire point. The temperature at which the plastic spontaneously ignites is called the auto-ignition temperature, referred to as the auto-ignition point. The burning point of plastic is higher than the flash point and the self-ignition point is higher.
Smoky
Suspended air in the plastic due to decomposition
OTIS Elevator Components, Thyssen Elevator Components, KONE Elevator Components, GiantKONE Elevator Components, ThyssenKrupp Elevator Components, Schindler Elevator Components, XJ Schindler Elevator Components, Xizi OTIS Elevator Components, Mitsubishi Elevator Components, Shanghai Mitsubishi Elevator Components, Fujitec Elevator Components, Hitachi Elevator Components, Toshiba Elevator Components, Hyundai Elevator Components, LG Elevator Components, Sigma Elevator Components, Express Elevator Components, GUANGRI Elevator Components, FUJI Elevator Components, BLT Elevator Components, CANNY Elevator Components, SJEC Elevator Components, KOYO Elevator Components, IFE Elevator Components
Elevator Components, Lift Components,Elevator Push Button Component
CEP Elevator Products ( China ) Co., Ltd. , https://www.zjelevatortravelingcable.com