What is the reason for the discoloration of
injection molded parts ? Let's take a look at the following Jiuzhi Plastics Network:
Equipment aspect
(1) The equipment is not clean. Dust or other dust deposits on the hopper to contaminate the material.
(2) Temperature control failure due to thermocouple, temperature controller or heating system imbalance.
(3) There are obstacles in the barrel, which tends to promote the degradation of plastics; metal foreign objects are stuck in the barrel or the screw groove, and the plastic is continuously ground to discolor the plastic.
Mold aspect
(1) The mold is poorly exhausted, the plastic is adiabatically compressed, reacts with oxygen at high temperature and high pressure, and burns the plastic.
(2) The mold gate is too small.
(3) Too much lubricant or mold release agent in the material or in the mold. If necessary, the cylinder should be cleaned regularly to remove additives such as antistatic properties that are inferior to the heat resistance of plastics.
(4) The size of the nozzle hole, the main flow path and the branch passage are too small.
Process aspect
(1) The screw speed is too high and the pre-plastic back pressure is too large.
(2) The temperature of the barrel and nozzle is too high.
(3) The injection pressure is too high, the time is too long, and the injection speed is too fast to cause discoloration of the product.
Raw material
(1) The material is contaminated.
(2) High moisture and volatile matter content.
(3) Decomposition of coloring agents and additives.
Spirit Level
Mini Steel Tape Measure With Spirit Level
Product Description:
Mini steel tape measure with spirit level features the compact design that is easy to hold and carry in hand. Despite of the small size, the product is made of carefully selected material to improve the durability and precision of the tape. The custom tape measure supplier, Wintape, provides steel tape measure of this kind in various patterns and colors. The mini steel tape measure with spirit level is a good choice as a present.
Specification:
|
Brand
|
Wintape
|
|
Model
|
STM-16
|
|
Material
|
ABS case, 65Mn steel
|
|
Case Size
|
42mm*42mm*9mm
|
|
Tape Size
|
1m/3ft*6mm
|
|
Case Color
|
Pink or customized
|
|
Tape Color
|
White tape with black scale
|
|
Scale
|
Cm on one side
|
|
Logo
|
Customized
|
|
Package
|
1pcs/poly bag; 50pcs/inner box; 500pcs/carton; Carton:36*23*28cm; GW/NW:13/14kg
|
Spirit Level Bubble,Smll Spirit Level Bubble,Steel Tape Measure Small Spirit Level Bubble
Wintape Measuring Tape Company , https://www.wintapetape.com