{"id":5039,"date":"2026-07-04T08:02:28","date_gmt":"2026-07-04T08:02:28","guid":{"rendered":"https:\/\/wolorin.com\/?p=5039"},"modified":"2026-07-04T08:02:28","modified_gmt":"2026-07-04T08:02:28","slug":"film-breaking-slitting-rewinding","status":"publish","type":"post","link":"https:\/\/wolorin.com\/es\/blog\/film-breaking-slitting-rewinding\/","title":{"rendered":"\u00bfPor qu\u00e9 se rompe la pel\u00edcula al cortarla o rebobinarla?"},"content":{"rendered":"
\n\t\t\t\t
\n\t\t\t\t\t
\n\t\t
\n\t\t
\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

\u00bfPor qu\u00e9 se rompe la pel\u00edcula al cortarla o rebobinarla?<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t
\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

Film may run normally and then break during acceleration. It may repeatedly tear from the same edge, fail in one narrow slit strip, or break near the same roller position. Changing the overall tension is rarely the best first step. A better starting point is to record where the tear began, when it happened, whether it followed the same knife, joint, strip, or roller position, and what changed immediately before the break.<\/p>

These details usually show whether the problem started with the film, the cutting edge, a film joint, a short tension change, or contact with a roller. Rubber-covered rollers often pull the film, transfer speed, and keep contact stable during slitting and rewinding. A dirty surface, weak grip, sudden grabbing, or bearing resistance can therefore be part of the same break event and should be checked together with the material, knives, tension, and machine movement.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"Transparent\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t
\r\n
\r\n\r\n
\r\n

First Find Where the Tear Started<\/h2>\r\n\r\n

The place where the broken film is found may not be where the tear began. A small cut can start at one edge, continue across the film, and travel through several roller positions before the machine stops.<\/p>\r\n\r\n

When it is safe to do so, keep the broken section and place the two ends together. Look for the first small notch, hole, scratch, fold, damaged slit edge, hard joint area, or mark left by adhesive or dirt. Mark the machine direction and strip number on the sample before restarting.<\/p>\r\n\r\n

\r\n
\r\n \r\n \r\n \r\n \r\n <\/colgroup>\r\n\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n
Where the tear starts<\/th>\r\n What to check first<\/th>\r\n <\/tr>\r\n <\/thead>\r\n\r\n
One film edge<\/td>\r\n Incoming edge damage, knife damage, side contact, or trim interference<\/td>\r\n <\/tr>\r\n\r\n
The same narrow strip<\/td>\r\n Damage from one knife, a weak slit edge, or uneven winding load<\/td>\r\n <\/tr>\r\n\r\n
Film center<\/td>\r\n A hole, thin area, coating defect, scratch, or trapped particle<\/td>\r\n <\/tr>\r\n\r\n
Cutting section<\/td>\r\n Blade damage, buildup, unstable cutting, or a loose knife holder<\/td>\r\n <\/tr>\r\n\r\n
After the same roller<\/td>\r\n Surface damage, dirt, turning resistance, weak grip, or sudden grabbing<\/td>\r\n <\/tr>\r\n\r\n
Film joint<\/td>\r\n Weak joining, hard tape edge, adhesive contamination, or poor alignment<\/td>\r\n <\/tr>\r\n <\/tbody>\r\n <\/table>\r\n <\/div>\r\n <\/div>\r\n\r\n

The tear shape can add another clue. A long diagonal tear usually begins at one side. A small hole that opens into a larger tear normally points to local film damage. A sudden break across most of the width is more likely to follow a quick change in pulling force.<\/p>\r\n\r\n

Narrow slit strips are more sensitive to edge damage because the remaining material has less width to carry the load. A small notch that causes little trouble on a wide web can become a serious weak point after the film is divided into narrow strips.<\/p>\r\n <\/section>\r\n\r\n

\r\n

Check When the Break Happens<\/h2>\r\n\r\n

The timing of the break helps separate a continuous problem from a short machine event.<\/p>\r\n\r\n

\r\n
\r\n \r\n \r\n \r\n \r\n <\/colgroup>\r\n\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n
When the film breaks<\/th>\r\n More likely direction<\/th>\r\n <\/tr>\r\n <\/thead>\r\n\r\n
During steady running<\/td>\r\n Material weakness, knife damage, continuous roller resistance, or fixed surface damage<\/td>\r\n <\/tr>\r\n\r\n
During acceleration<\/td>\r\n A roller or roll cannot speed up smoothly, grip becomes unstable, or a weak edge is pulled harder<\/td>\r\n <\/tr>\r\n\r\n
During deceleration<\/td>\r\n Brake response, sudden tightening, or temporary loss of grip<\/td>\r\n <\/tr>\r\n\r\n
Immediately after restart<\/td>\r\n Film sticking, static cling, a stiff joint, or poor release from a roller surface<\/td>\r\n <\/tr>\r\n\r\n
At a similar roll size<\/td>\r\n A change in roll weight, motor load, or winding condition<\/td>\r\n <\/tr>\r\n <\/tbody>\r\n <\/table>\r\n <\/div>\r\n <\/div>\r\n\r\n

If reducing acceleration lowers the number of breaks, the line probably contains a position that cannot follow the speed change smoothly. The next step is to compare the unwind, rewind, brakes, motors, free-turning rollers, tension arms, and any rubber roller where the film appears to slide.<\/p>\r\n\r\n

The tension value shown on the screen may still look normal. A very short rise can happen too quickly to appear clearly, or it may occur between the sensor and the actual break point. For this reason, the break time should be compared with line speed, tension movement, motor load, and the size of the unwind and rewind rolls.<\/p>\r\n\r\n

When breaks repeatedly follow acceleration, deceleration, or changing roll diameter, the related tension control roller positions<\/a> should be checked together with the drive and brake response.<\/p>\r\n <\/section>\r\n\r\n

\r\n

Check the Film Before Changing Machine Settings<\/h2>\r\n\r\n

La pel\u00edcula puede volverse m\u00e1s fr\u00e1gil tras el recubrimiento, laminaci\u00f3n, secado, curado, enfriamiento o almacenamiento. El nombre del material y el espesor nominal por s\u00ed solos no indican si una zona se ha debilitado m\u00e1s que las dem\u00e1s.<\/p>\r\n\r\n

Compare the current roll with a roll that ran normally. Check untreated film against coated or laminated film, center material against edge material, and the broken strip against the strips beside it. If the break rate changes after curing, cooling, or storage, that process history should stay in the investigation.<\/p>\r\n\r\n

Uneven coating, local overheating, poor drying, adhesive contamination, weak bonding between layers, or a local thin area can all create a starting point for the tear. A wide film may run successfully before slitting and still fail afterward because narrow strips expose small edge cuts and weak areas more clearly.<\/p>\r\n\r\n

For wider thin-film contact and handling requirements, see rodillos de conversi\u00f3n de pel\u00edcula<\/a>. For the current break event, however, the retained sample and its production history are the better starting points.<\/p>\r\n <\/section>\r\n\r\n

\r\n

Check the Cutting Knives and Film Joints<\/h2>\r\n\r\n

A knife can damage the film even when the cut edge does not look obviously rough. A small chipped section, a worn blade, adhesive buildup, particles around the cutting point, unstable blade contact, or movement in the knife holder can create an intermittent weak edge.<\/p>\r\n\r\n

Compare the broken strip with a neighboring strip cut by another knife. If the break moves when the knife position is changed, the cutting setup becomes the stronger lead. If it remains on the same physical side of the parent roll, the damage may already exist before the knife.<\/p>\r\n\r\n

When the starting point moves sideways as the film moves sideways, the related web tracking problem<\/a> should be checked. For this break investigation, the useful question is where that sideways movement first damages the film edge.<\/p>\r\n\r\n

Film joints should be checked in the same practical way. Look at whether the two film ends are aligned, whether the tape is too thick or too hard, whether adhesive has squeezed outside the joint, and whether the joint catches a guide edge or narrow opening. The joint may fail directly, or it may remain intact but create a short pulling or contact change when it reaches a driven roller or pressure point.<\/p>\r\n <\/section>\r\n\r\n <\/div>\r\n<\/section>\r\n\r\n