The stretch film machine is divided into pre-stretch type and resistance stretch type according to the stretching of the stretch film. Pre-stretching means that the packaging film is pre-stretched by a pre-stretching mechanism, and the pre-stretching mechanism is not stretched. It can only rely on the goods to rotate and stretch the film. The differences between the two will be explained in detail below.
Stretch film machines are divided into pre-stretch type and stretch-stretch type according to the stretching of the stretch film. Pre-stretching refers to the pre-stretching of the stretch film through a pre-stretching mechanism, and the stretching is not a pre-stretching mechanism. The film can only be stretched by the rotation of the goods. You can choose which stretching method to use according to the characteristics of the product. Two stretching methods are described in detail below:
The pre-stretching film machine refers to the pre-stretching of the film through the pre-stretching film frame mechanism according to the preset stretching ratio. The operator only needs to set the number of winding layers and the height of the top, put the items into the turntable, start the equipment, the film frame motor, turntable, and pre-pulling motor will automatically run, which can realize the whole roll packaging of the goods.
The resistance stretching winding machine refers to the friction damping of the resistance stretching mechanism, so that the speed of the wrapping film is relatively slower than the rotation speed of the pallet cargo, and the wrapping film is pulled apart by its own weight. goods. The resistance stretching method requires the cargo to have a larger dead weight. Generally, more than 1 ton is required. If the weight is too light, the goods may not be able to pull the film, and may be pulled by the stretch film, resulting in inability to pack properly.
The resistance type stretch winding machine can adjust the damping to zero, that is, no stretching is required. Therefore, this machine has lower requirements for stretch film, and general stretch film can meet the requirements. The disadvantage is that lighter and taller goods cannot achieve stable packaging.