China SK-780U 780Ton Two-Platen Injection Molding Machine from Trusted Suppliers and Factory
Product Introduction
The Strategic Bridge: Elevating Mid-Range to Large-Scale Production
Engineered to seamlessly bridge the gap between mid-range and large-scale manufacturing, the SUCCESSOR SK-780U Two-Platen Injection Molding Machine takes the core strengths of the SK-U series and elevates them with enhanced rigidity and unparalleled operational flexibility. This machine is designed for producers who are scaling up and require a solution that can handle larger volumes without compromising on the precision and reliability that define the series. Its high-rigidity clamping unit, perfectly paired with advanced precision guidance systems, ensures stable platen movement with a guaranteed accuracy of ±0.05mm. This level of precision is critical for achieving consistent part quality, especially when running complex or large-format production runs where tight tolerances are non-negotiable.
To maximize yield and minimize errors, the SK-780U is equipped with a three-rod, single-cylinder braking system. This configuration guarantees precise synchronization across all mold operations, from opening to closing and ejection, eliminating timing errors and significantly boosting product yield. Performance is further enhanced by an instantaneous response system, coupled with high-response dual proportional valves, which deliver rapid, reliable performance and rock-solid control over the entire process. The machine's thoughtful design extends to its adaptability; the independent high-pressure cylinder allows for easy tie-bar extraction, seamlessly adapting to low-headroom workshops and maximizing space utilization. Durability is a cornerstone, achieved through uniform-stress guide posts that are specially treated for superior wear and corrosion resistance, ensuring over 99% force uniformity to prevent eccentric loading and maximize the machine's service life. The reinforced platen provides exceptional mold-closing stability, while the extended stroke accommodates deep-cavity molds, offering a more cost-effective alternative to bulkier three-plate machines. The streamlined architecture simplifies maintenance, particularly for the movable platen and brake components, and its automated parameter setup enables quick and efficient mold changes, dramatically improving operational efficiency. Ideal for automotive interior parts, large packaging containers, and critical industrial components, the SK-780U is a versatile and robust solution, combining precision, durability, and energy efficiency for high-demand mid-to-large volume production.
Core Engineering Highlights
A buffered mechanism ensures rapid, reliable clamping with zero impact.
Facilitates controlled, slow high-pressure opening and enables easy tie-bar extraction for low-headroom facilities.
An L-shaped rail on a robust frame guarantees ±0.05mm accuracy, ensuring rapid and stable platen movement.
Specially treated for rigidity and wear/corrosion resistance, these posts achieve over 99% force uniformity to prevent eccentric loading and maximize service life.

Achieves a repeatable mold opening accuracy of ±0.2mm—a fivefold improvement over standard three-plate machines. (Verified by internal 1200-ton testing).

SK-U series machines' intelligent deceleration control provides unparalleled sensitivity, achieving the "A4 paper rebound" standard. It can stop on the slightest obstruction, ensuring your valuable molds are protected with maximum reliability.

Experience significantly faster dry cycles. Our optimized system delivers rapid mold opening and clamping, translating directly into enhanced productivity and greater output. (Verified by 1200-ton internal testing).
Partial Product
Machine Specifications
MODEL |
SK-780U |
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Description |
Item |
Unit |
A |
B |
C |
INJECTION UNIT |
Screw Diameter |
MM |
95 |
100 |
105 |
Screw L/D Ratio |
L/D |
21.2 |
20.1 |
19.1 |
|
Shot Size (Theoretical) |
CM³ |
2977 |
3300 |
3636 |
|
Injection Weight (PS) |
G |
2709 |
3003 |
3309 |
|
Injection Rate |
G/S |
562 |
623 |
686 |
|
Plasticizing Capacity |
G/S |
72 |
85 |
95 |
|
Injection Pressure |
MPA |
158 |
143 |
130 |
|
Screw Speed |
RPM |
0 - 130 |
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CLAMPING UNIT |
Clamp Tonnage |
KN |
7800 |
||
Space Between Tie Bars |
MM |
1070×940 |
|||
Opening Stroke |
MM |
1700/1000 |
|||
Max. Mold Height |
MM |
1100 |
|||
Min. Mold Height |
MM |
400 |
|||
Max. Daylight |
MM |
2100 |
|||
Ejector Stroke |
MM |
300 |
|||
Ejector Tonnage |
KN |
150 |
|||
Ejector Number |
PCS |
17 |
|||
OTHERS |
Max. Pump Pressure |
MPA |
17.5/21 |
||
Pump Motor Power |
KW |
48+48+13 |
|||
Heater Power |
KW |
46.45 |
|||
Machine Dimension (LxWxH) |
M |
8.5×2.7×2.5 |
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Machine Weight |
T |
30 |
|||
Oil Tank Capacity |
L |
1000 |
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Certifications









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Frequently Asked Questions
The SK-780U delivers a clamping force of 7800 KN (780 tons), making it well-suited for mid-to-large scale production of automotive interior parts, large packaging containers, and industrial components.
The SK-780U features a high-rigidity clamping unit with an L-shaped precision guidance rail, guaranteeing stable platen movement with an accuracy of ±0.05mm. Its mold opening position repeatability reaches ±0.2mm — five times better than standard three-plate machines.
Yes. The SK-780U is equipped with an independent high-pressure cylinder that enables easy tie-bar extraction, allowing the machine to adapt seamlessly to low-headroom facilities and maximizing space utilization without compromising performance.
The SK-U series incorporates intelligent deceleration control with ultra-sensitive mold protection, achieving the "A4 paper rebound" standard. The system can detect and stop on the slightest obstruction, ensuring maximum protection for valuable molds and preventing costly damage.
The SK-780U offers three screw configurations (95mm, 100mm, 105mm diameter). The theoretical shot size ranges from 2977 to 3636 cm³, injection weight (PS) from 2709 to 3309 g, injection rate from 562 to 686 g/s, and injection pressure from 130 to 158 MPa. Screw speed is adjustable from 0 to 130 RPM.
The SK-780U is ideal for automotive interior parts, large packaging containers, and critical industrial components. Its combination of high clamping force, precision guidance, extended stroke for deep-cavity molds, and energy-efficient design makes it a versatile solution for high-demand mid-to-large volume production environments.









