Nakata Invisible Tear Processing Machine.



The Challenge: For applications such as air bags in car doors and instrument panels, you need to create material that tears open under pressure, in an accurate, controlled and predictable way. Yet on its exposed side, the material’s tearable area should be “invisible” to the eye – and thus desirable for high-end interiors. Common existing machines can be costly to operate – and use technology that may introduce unwanted irregularity, deterioration or degradation of the material. So how do you make the parts you need, in the form you want, at the best possible cost?


The Nakata Cold Knife Solution for Soft Skins: For soft materials such as instrument panel skins, we developed our innovative Cold Knife Invisible Tear Processing Machine. The ultra-durable blade, guided by specialized displacement sensors, creates the desired groove depth and pattern in PVC, TPO, TPU or other material, yet without disturbing the thickness, texture or integrity of the surrounding area. And because the material is held stable by a vacuum during this operation, even grooves on complex forms can be made with speed and accuracy. The result: the precise air bag deployment performance you need, with the cosmetic “invisibility” you want. At an efficient cost, too.


The Features and Advantages:

Long-lasting cold blade performance (rated for 10,000+ cuts)! Nakata’s innovative technology conquers the main weakness of past cold blade equipment: edge durability. The result – increased efficiency and lower production cost.

Fast, easy – and infrequent – blade changes. When any abnormality or change in cut accuracy is detected, blade change-out is a quick and simple, keeping down time at a minimum.

Accurate “invisible” tear grooves, time after time – assured by continuous measurement by an outside 2-dimensional displacement sensor. This checks against data stored in the machine’s control computer.

Consistent surrounding material thickness is assured by a second 2-dimensional displacement sensor.

Complete stability for the most meticulous cuts – with a support stand that holds the skin in place with a vacuum during the procedure. This assures accuracy even on complex forms.



The Nakata End Mill Solution for Hard Substrates: When dealing with harder injection-molded substrate material, for items such as automotive door panels that hold air bag mechanisms, we recommend our End Mill Invisible Tear Processing Machine. This device uses a specially-shaped end mill to produce the exact groove shape and depth needed on the underside, leaving the cut invisible on the exposed side. Precision is assured in several ways: the material is held stable by a vacuum system, the processor stores up to 2,000 computerized command sequences to guide the end mill, while high-resolution photography checks cut accuracy, and a 2-D displacement sensor determines thickness of the surrounding residual material. All this gives you a uniform, cost-effective, and cosmetically invisible end product that allows proper air bag deployment.



High machining accuracy (+/-0.02mm) assured by high-resolution photography – an integrated high-res camera automatically checks the shape of the end mill and the cut (before and after) to ensure precision.

Early detection and warning of any cut variance – so that you can replace the end mill quickly and avoid defective or unusable parts.

Computer-controlled cuts (with storage of up to 2,000 commands) – with 2-dimensional displacement sensors to check the cut itself the residual thickness of surrounding material.

Complete stability for the part being cut – with a support stand and vacuum system to hold the part in place during the procedure. This assures accuracy even on complex forms.

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