Impact type, roll folding type, knife type and fence type are four common folding principles in brochure printing, each of which has its own characteristics.

Impact folding principle

With the help of the vertical folding triangle, the folding is obtained along the longitudinal direction of the paper. The movable folding knife extends out of the folding roller to fold the paper and push the paper between the two continuously rotating folding rollers 4 to compact and transfer the folded sheet to the collection roller. A folding device that performs folding according to this principle is called an impact folding machine. The impact folding machine has a simple structure and is suitable for high-speed printing, but the folding accuracy is slightly lower.

Principle of Roll Folding

The paper that has been cut to be folded is on the folding roller 2 and the output roller 1, and is picked up and rotated by the pick pin 4. On the connecting line of the roller, the elastic folding knife 5 inserts the paper 3 into the gap of the roller 2, The clamping plates 6 and 7 clamp them along the fold line and are taken away by the roller 2, and the folding knife is withdrawn from the fold line. A device that uses the folding knife of one roller and the clamping plate of the other roller to complete the folding during relative rolling is called a roller folding machine.

The scroll folding machine has high folding accuracy and high speed, and is generally used on web book printing presses. According to the number of folds completed and the type of folds, different numbers of folding rollers and folding schemes are used.

Principle of Knife Folding

Knife folding uses a folding knife 1 to press the paper 4 between two relatively rotating folding rollers 2, and then sends it out by the folding rollers to complete a folding process. After the folding is completed, the paper is taken away by the conveyor belt and enters the second fold and the third fold.

Knife folding has high precision, the book signature is crease and compacted, and the folding speed is slow due to the inertia of the folding knife.

Principle of Fence Folding

The printed sheet 4 sent by the feeding device passes through two rotating folding rollers 2 and is transported to the folding fence. When it hits the fence baffle 5, the printed sheet is forced to bend in half and fold into the middle of the folding roller 3. , Complete the folding, and then move the folded signature to the next folding fence, and use the same method to perform the second and third folds. After being sent to the delivery table, the folding work of a sticker is completed.

Any printing needs, feel free to contact us at bookprintingchina.com. We will provide you with a good China printing service.