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Cutting film is so important, the quality couldn't get on what is the problem?
In the production of composite membrane was cutting quality of the roller is very important. Each operation personnel should not only master quality influential factors of cutting film, but also can eliminate these problems as soon as possible. Also know cutting film thickness tolerance, film winding condition, all have important influence on cutting.
Eight major factors affecting the quality of cutting and membrane
1. The film membrane of relaxation
All horizontal length, thin film membrane picture is not the same, if the change is greater than the width of the membrane, and the tension strain, make a lot of film immediately after slitting and relax, and because the tension and stiffness of the small and the lack of traction, then the entire membrane shift happens.
2. The film after a scroll of gravity
Because of viscose and electrostatic interaction, must use force to the film from put off on the reel. If you have any change, viscous force and electrostatic effect is too strong, or will directly lead to scroll wrapped and tracking problems.
3. The rollers skew shift
Even if the film length is smaller than the tension, may also cause tracking problem. Scroll compared commonly easy tension membrane, skew and traction changes will cause film roll shift.
4. Rewinding accumulation caused by the relaxation
Latches winding is very sensitive to reel diameter change, because not differential rewinding, put the rotation speed of the scroll can be in different operation, the thinner film, scroll, the smaller the diameter of drum membrane accumulation is less, the result leads to film membrane volume relaxation and shift.
The axial displacement of the longitudinal cutting knife
Sometimes points at the start of the film cutting, cutting and crooked, but that does not belong to trace fault, a solution to this situation is that the dial indicator to measure the longitudinal cutting knife in the rotation and the lateral shift when charging, then can grasp the slitting width change by it, but all the cutting knife to run is consistent, can ensure the cutting each roller absolutely consistent.
6. Put the scrolls and scrolls diameter change tracking
Downstream scrolls of cylindricity can make film with large diameter walked, and complex scroll not cylinder profile, but also can have the same effect. To pull the roller to big diameter, laminated and clearance scroll also could avoid such problems.
7. Put a scroll or rewinding correction
Usually feed rules, limits on the film into the downstream scroll, it is with the vertical axis of rotation direction, by the same token, if error correction, deviating from the center or complex scroll will change again, roller transverse location. After master these process operating principle, can avoid the above problems, so as to reduce waste.
Line 8. The longitudinal cutting and challenge
Homogeneous wide material cutting into narrow volume, is relatively easy. But if you want to cut the material points in linear or stripes, the scale of the trimming is very strict, will feel very difficult. But may have some skilled operators, there are some high precision slitting and experience, slitting width tolerance can be controlled within + / - 0.003 in.
To pay special attention to is: cutting and positioning specifications than the width of more than 10 times higher than that of high precision slitting. In normal production, resulting in the difficulty of cutting and processing, because tolerance and high precision slitting itself is not easy, also must face the problem of three influential to tolerance, namely, tension, flatness and the location of the cutting blade. For high precision cutting and processing, as well as some tolerance problems need to be solved.
Measures to ensure the quality of cutting products
1. To have a stable tension
Stable tension can provide continuous narrow neck for cutting knife, keep the width of the original disappeared in tension. In addition, the tension can also affect the tracking and correction.
2. The membrane of flatness
Membrane picture before entering the shear knife must look very flat. Good points and cutting machine, including membrane stretching device, can be transverse tension membrane. Therefore, must keep the membrane formation.
3. To know what the absolute tool setting and performance
Cutter spacing is decided slitting width. Tool positioning didn't stop at set time. Shift, shaking, deflection, and other conditions are likely to lead to tangent point and set up in the right position.
4. According to the requirements of process control feeding process
Membrane of incoming material must have a uniform width and spacing. The thickness of the thin film material must also have a unified, coefficient and stitching. Feed put scroll cannot exceed the scope of the membrane of the corrector or speed. But any uneven film on the picture should be resumed under the tension of usually is flat and level. There are many types of feed is the most difficult, because usually cannot control quality.
5. Make sure the sensor work
Sensors must constantly test article cutting edge. Any error in testing or blind area will directly led to the cutting of the error.
6. The accuracy of the corrector
Corrector must be strictly controlled and respond at any time, scope and impact velocity must match the quality and speed of the feed volume.
In cutting and normal production, don't think the precise positioning of the film will help to automatic correction of the blade position. In production many times from the correction to the cutting knife track link make mistakes, but as long as the guarantee of short film, the tension of ideal standard cylindrical spool, qualified traction and put a scroll position correction will help reduce the tracking error in the membrane process.