Granco Clark

Stretchers

Stretching is one of the most critical post-quenching operations in the extrusion process: Performing that function correctly often makes the difference between usable product and scrap. An overstretched profile will be out of tolerance: a profile that is not stretched to its yield point will snap back unstraightened. Both are destined to become scrap.

GRANCO CLARK stretchers deliver precise, accurate stretching, which enhances profile quality and keeps scrap to a minimum. And used in conjunction with our belt systems, our stretchers straighten and batch profiles for efficient downstream operations. Increasing throughput as well. 

 

Versatility to Meet Any Operational Challenge

GRANCO CLARK stretchers accommodate a broad range of requirements. Our stretchers are available in cam-style, diagonal “uni-slide,” and controlled vertical crush jaw designs. One, two, or no-man operational modes offer labor savings and give you the flexibility you need to meet operational challenges.

 

Superior Safety Features

The safety of GRANCO CLARK stretchers is unsurpassed in the industry. Three safety mats are positioned around the perimeter of the power-head end; any intrusion into this area immediately stops the stretcher. At both ends of the stretcher, light curtains protect the operator from injury by releasing the jaw if the curtain is penetrated. Two hands—one to activate, the other to confirm—are required to operate the stretcher jaws, insuring that both of the operator’s hands are out of harm’s way. If you prefer, an additional light curtain may replace the perimeter safety mats.

 

Maximum Gripping, Minimum Distortion

Precise control of gripping pressure prevents the stretcher both from excessively distorting the cross-section of profiles and from allowing slippage of the extrusion. The GRANCO CLARK Controlled Vertical Crush Stretcher (CVCS) delivers that kind of precision.

GRANCO CLARK’s approach to CVCS technology is unique. Our design uses a pivoting upper jaw that can be set to any closing dimension, minimizing the distortion that can be caused by traditional jaw designs and significantly decreasing scrap.

When maximum gripping is required, as when stretching solid bar stock, the upper jaw can beset to pivot fully until the desired pressure is reached. This ensures that maximum crushing force is exerted, thereby preventing slippage.

The CVCS’s vertical motion prevents the extrusion from getting “hung up” in the teeth of the jaw. This eliminates operational delays and reduces the need for manual intervention.

 

Features

  • Efficient, accurate stretching
  • State-of-the-art safety features, including safety mats, light curtains,and two-handed safety controls
  • Various jaw designs—cam-style, diagonal “uni-slide,” controlled vertical crush
  • One, two, or no-man operational modes
  • Controlled crush distance and pressure (CVCS model)

Benefits

  • Increased usable product
  • Maximum operator safety
  • Accommodate various operational needs
  • Labor savings
  • Flexibility to meet varying operational challenges
  • Preservation of profile surface quality and dimensional integrity
  • Elimination of slippage