Technical Specification for Mold Thickness Matching Table of Injection Molding Machines
General Matching Table Between Clamping Force of Horizontal Injection Molding Machine & Adaptable Mold Thickness (Unit: mm) & Supporting Instructions
| Clamping Force(T) | Min Mold Thickness(mm) | Max Mold Thickness(mm) | Safe Mold Thickness Range(mm) | Tie Bar Spacing(mm×mm) | Applicable Scenarios |
|---|---|---|---|---|---|
| 50 | 130 | 320 | 150~300 | 300×300 | Precision electronic inserts, small connector molds |
| 80 | 150 | 370 | 170~350 | 360×360 | Mobile phone decorative parts, small cosmetic housings |
| 120 | 175 | 450 | 195~430 | 460×460 | Daily plastic products, toy shells |
| 160 | 175 | 480 | 195~460 | 480×480 | Small home appliance panels, refrigerator internal structural parts |
| 220 | 200 | 550 | 220~530 | 560×560 | Washing machine decorative panels, miniature automotive plastic parts |
| 320 | 220 | 620 | 240~600 | 650×650 | Large household appliance shells, automotive interior trims |
| 400 | 230 | 720 | 250~700 | 720×720 | Refrigerator door panels, large home appliance appearance molds |
| 530 | 260 | 820 | 280~800 | 820×820 | Automotive instrument panels, large structural molds |
| 650 | 280 | 920 | 300~900 | 910×910 | Automotive bumpers, oversized appliance casings |
The actual overall thickness of a mold must be kept between the minimum and maximum mold thickness limits of the selected machine model. It is strictly forbidden to adopt a mold thickness smaller than the lower limit, which may lead to incomplete mold locking and permanent damage to toggle hinges caused by overstressed toggle mechanisms. If the mold thickness exceeds the upper limit, the mold plates cannot be fully closed, and forced clamping will stretch and deform tie bars. A 20mm safety allowance is recommended in actual production, namely the safe range listed in the attached table, to accommodate thermal expansion and mold adjustment allowance.
High-temperature PPS molds expand slightly when heated, so their mold thickness should be set near the middle-lower section of the safe range to prevent the heated mold thickness from exceeding the upper limit.
General specifications for vertical injection molding machines: the 35T vertical machine features a minimum mold thickness of 150mm and maximum mold thickness of 350mm; the 85T vertical machine has a minimum mold thickness of 200mm and maximum mold thickness of 450mm.
Two-plate large injection molding machines boast a wider adjustable range of mold thickness. Under the same clamping tonnage, their maximum allowable mold thickness is 80~150mm larger than that of toggle-type machines, making them suitable for large automotive molds.
The length and width of the mold shall not exceed the inner spacing between tie bars. A clearance of more than 15mm must be reserved between each side of the mold and the tie bars to avoid friction against tie bars during mold clamping.
Simple Model Selection Rules
Total closed mold thickness equals the sum of the front plate, cavity plate, rear plate and hot runner plate thickness. After calculation, select the injection molding machine of corresponding tonnage by referring to the matching table. Hot runner molds usually have larger overall thickness, so machines with larger maximum mold thickness should be prioritized during model selection.
