الصفحة الرئيسية / المدونة
Cooling time runs 4 seconds at a 1 mm wall and 36 at 3 mm, because it follows the square of thickness. A mould 20 degrees colder saves eight seconds a cycle and buys distortion, which is the trade nobody puts on the cycle sheet.
Cooling time runs 4 seconds at a 1 mm wall and 36 at 3 mm, because it follows the square of thickness. A mould 20 degrees colder saves eight seconds a cycle and buys distortion, which is the trade nobody puts on the cycle sheet.
A cold runner cuts runner waste from 22 percent of the shot to 5. It also puts the compound in a block held just below cure temperature, where ten degrees halves the working life: 72 hours at 10 C, four and a half at 30.
An epoxy tool costs 0.53 per part at five thousand parts and an aluminium tool costs 2.21, so epoxy never loses on price. It loses on life, at about five thousand parts, and aluminium is what you buy when the volume outlives the cheap tool.
Intrinsic viscosity loss runs 0.02 at 50 ppm moisture, 0.12 at 200 and 0.55 at 800. The drying specification is 50 ppm because 100 ppm is already at the limit, and crystallinity on the chill roll decides whether the sheet will form at all.
Cavity pressure demand runs from 25 to 57 MPa as the flow ratio goes from 50 to 250, and the tonnage follows. Flash width falls from 0.35 to 0.01 mm between 20 and 60 MPa of held pressure, which is why adding tonnage to fix flash usually makes a different problem.
Void content falls from 2.4 to 0.4 percent between 100 and 20 millibar, then to 0.08 at 5 millibar, where the gain is measured in hundredths. Thirty minutes of degassing consumes a third of the pot life, and the cure does not pause while you wait.
Heating is 22 seconds of a 45 second cycle and no robot can touch it. Handling cost falls from 9.5 to 2.7 cents a part as cavities go from one to six with a robot, but at one cavity the robot is 11.0 cents against 9.5 for a person.
Density falls from 0.75 to 0.42 g/cm3 as blowing agent goes from 0.4 to 1.2 phr, and each 0.2 phr buys less than the one before. Thermal conductivity bottoms out at 0.45 g/cm3, so the lightest board is not the best insulator and not the cheapest wall.
Fill pressure falls from 62 to 44 MPa as speed rises from 10 to 50 mm/s, then climbs back to 68 at 150. The floor is where freezing stops choking the flow, not where the machine is happiest, and the profile has to follow the geometry.
Six tenths of a phr of internal release cuts demoulding force from 180 to 75 newtons. At 1.5 phr it cuts it to 30 and takes secondary bond strength to 30 percent of control. Most of the release is in the first third of the dose, and all of the damage is in the last third.
Eight degrees of nesting removes 57 percent of stack height for a hundred parts. It also puts 429 newtons on the bottom part of a fifty-high stack, and a 1.2 mm wall at 60 C creeps under that in a trailer. The angle is a cost decision with a failure mode attached.
في Uplastech، نحن متخصصون في تقديم حلول تصنيع المنتجات البلاستيكية عالية الجودة والمخصصة والمصممة لتلبية الاحتياجات المتنوعة للصناعات في جميع أنحاء العالم.
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