Key Points of The Sealing And Cutting Process for Transparent Film Three-dimensional Packaging Machines

Analysis of Key Points of the Sealing and Cutting Process for Transparent Film Three-dimensional Packaging Machines

The sealing and cutting process of the transparent film three-dimensional packaging machine directly affects the packaging quality, efficiency and product aesthetics. The following analysis is carried out from four aspects: process flow, key parameters, operation skills and precautions:

First, the core links of the process flow

Sealing preheating and shaping

The sealing area needs to be preheated to the set temperature (such as 150-190℃) in advance to ensure that the heat-sealing layer melts.

The packaging film wraps the product through a forming mold to form a three-dimensional structure. During this process, it is necessary to keep the tension of the film material uniform to avoid wrinkles or offset.

Heat sealing and cooling setting

The heat sealing knife contacts the film material at a constant pressure (such as 0.3-0.5MPa) to complete the longitudinal and transverse sealing.

After sealing, rapid cooling is required (such as through air cooling or water cooling) to prevent deformation of the membrane material or rebound of the seal.

Cutting and waste disposal

After the sealing is completed, the cutting knife should precisely cut the membrane material, and the cut should be smooth without burrs.

Waste materials are recycled through winding or crushing devices to avoid polluting the production line.

Second, key points for controlling critical parameters

Temperature control

The sealing temperature needs to be adjusted according to the thickness of the membrane material (such as 20-50μm) and the material (such as BOPP, PVC). If the temperature is too low, it may cause the sealing to be loose; if it is too high, it may burn through the membrane material.

The sealing temperature for BOPP film is usually 160-180℃, while for PVC film, it can be appropriately reduced to 150-170℃.

Pressure and Time

The pressure should be evenly distributed to avoid local overpressure causing damage to the membrane material.

The heat sealing time should be matched with the melting characteristics of the membrane material, usually ranging from 0.5 to 2 seconds. If it is too short, the seal will not be firm; if it is too long, it may affect the production efficiency.

Membrane material tension

During the conveying process, the tension of the membrane material should be stable, and the deviation should be controlled within ±5%. Excessive tension will cause the membrane material to stretch and deform, while insufficient tension is prone to wrinkling.

Third, operational skills and solutions to common problems

Investigation of poor sealing

If there is a false weld or air leakage at the seal, it is necessary to check whether the temperature, pressure and time are matched, or whether there is oil stain or dust on the surface of the membrane material.

For example, if there are bubbles at the seal, it might be due to excessively high temperature or moisture in the membrane material. In such cases, the temperature should be adjusted or the membrane material should be replaced with a dry one.

Adjustment of cutting offset

The position of the cutting knife should be aligned with the sealing line, and the deviation should be less than 0.5mm. It can be corrected by adjusting the position of the tool rest or sensor.

Regularly check the wear of the cutting knife and replace it in time to ensure the quality of the cut.

Prevention of membrane material deviation

Install guide rollers and deviation correction devices to ensure that the membrane material maintains linear movement during the conveying process.

If the membrane material shifts to one side, the Angle of the guide roller can be adjusted or counterweights can be added.

Fourth, Precautions and Safety regulations

Equipment maintenance

Regularly clean the heat sealing knife and the cutting knife to prevent residual glue or foreign objects from affecting the sealing and cutting quality.

Check the heating elements and temperature control system to ensure that the temperature display is accurate.

Safe operation

Protective covers should be set up in the sealing and cutting areas to prevent operators from coming into contact with high-temperature components.

During the operation of the equipment, it is strictly prohibited to adjust parameters or clean up waste materials. Operations must be carried out after the machine has been shut down.

Membrane material compatibility

Different types of film materials (such as single-layer films and composite films) need to adjust the sealing and cutting parameters accordingly.

For composite films, the melting point differences of each layer of materials need to be taken into account to avoid local overheating.

Summary

The sealing and cutting process of the transparent film three-dimensional packaging machine needs to be precisely controlled by parameters such as temperature, pressure, time and tension, combined with equipment debugging and operation skills, in order to achieve efficient and stable packaging effects. During production, close attention should be paid to the sealing quality, cutting accuracy and the operating status of the film material. Problems should be promptly identified and the process optimized.