Nadelgreifer bei SMC

Gripping Technology in use during Hot Pressing of SMC

When processing SMC (sheet molding compound), corresponding cut pieces of the semi-finished product are cut out from the raw material on the cutting table (1). The long fibers with a length less than 50 mm, which are embedded into the duroplastic matrix, are randomly oriented. A gripper picks up the tough, pasty and tacky cut piece and places layer by layer on a weighing table (2). To get to the correct quantity of material, multiple layers of the material are stacked on top of each other. A gripper, which is usually a special needle gripper with a high penetration force, picks up the stack of individual layers and positions it in the press (3).

The SMC material already contains all of the components (resin and reinforcing fibers) required for production. Under high temperatures, the semi-finished product is plastified and pressed into the desired shape (4).

The finished part is removed with vacuum suction cups that are ideally "non-marking" and resistant to heat (5).


Schmalz (Shanghai) Co., Ltd.
No. 1 Chunquan Road
Pudong, Shanghai, China
ZIP: 201210

T: +86 21 510999 33
F: +86 21 503988 82
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Requirements for Gripping Technology

Tackiness of the workpiece
A feature of SMC materials is their tacky surface due to their composition of reactive resins and reinforcing fibers. It is a challenge for the gripper to ensure that the cut piece does not remain stuck on the gripper during the handling process.

Resistance of the material
The rubbery, pasty material can only be handled with difficulty using conventional grippers. Due to its high level of resistance, the material is very difficult to penetrate and requires a high insertion force.

Products for Use in Hot Pressing of SMC

SNG-V 6 1.5 V-HP-25
Needle gripper "SNG-V", particularly robust version
Number of needles: 6
Needle diameter: 1.5 mm
Additional function:
Variable stroke, high force
Needle stroke Z(NA): 25 mm
Pressure range (operating pressure):
3.0 ... 7.0 bar