5 points that must be paid attention to in composite film bag making

 

Bag making is the last step in the production of composite packaging bags. After the previous printing and compounding, most of the possible problems have passed, so it is often taken lightly during the bag making step. In fact, this step of making bags is also critical, and there are still many things to pay attention to.

 

1. Selection of tooling

The compound film bag making tool includes specification board, heat sealing knife, punching device, special cutting knife, etc. Before production, it is necessary to clarify the specific form of the composite film bag, and then select the appropriate tooling, and ensure the feasibility of the tooling, which is very necessary. Tooling is generally specified according to the size of the product.

For example, the specification board can be selected according to the width of the forming bag; the heat sealing knife is selected according to the heat sealing size, and different forms of heat sealing knife are selected according to the heat sealing width and material, so as to receive the best heat sealing effect; According to the shape of the hole, the puncher chooses whether to punch the bag directly with the composite film or to process it after punching.

 

2. Sealing position and cutter position

The position of the cutter of the sealing machine seems to be a very simple matter, but it is often caused by the loss of bulk products because of taking it for granted, which is more common in flexible packaging factories.

Therefore, you must carefully review the production order before starting up, and clarify the bag sealing position and the cutter position. Products with patterns or cursors generally determine the sealing and cutter positions according to the pattern or cursor, such as sealing the sky or the back cover, under the cursor, or on the cursor, etc. ; For products with irregular patterns, it can be clarified according to the important signs in the graphics. Generally, the position of the seal and the cutter are closely connected, but sometimes it is not completely unified. Some special products must be reviewed carefully to avoid cutting errors.

 

3. Location and form of easy tear and vent holes

The easy tear and vent holes are an additional way to the packaging bag for the convenience of packaging. Different manufacturers have different requirements on the two. There are many forms of easy tearing, such as: laser method, U-shaped or V-shaped punching method. Laser easy tearing has a good anti-counterfeiting function, which is convenient to use, but the equipment is more expensive. At present, it is more commonly used to punch holes on the edge of the edge. This method is simple to operate and direct to use.

There are many kinds of vent holes, such as pinholes and round holes, and the location and number of different products are also different. For example, the pocket vents for powder solid packaging can be equally spaced along the longitudinal or horizontal direction of the bag or Several pinholes are arranged at unequal intervals. In this way, it is easy to exhaust the contents and reduce the damage during transportation and storage. Therefore, according to customer requirements and product use, it is important to clarify the easy tearing and punching methods of the product.

 

4. Cutter form

The cutter generally has a straight line shape, a tooth shape, etc., and the tooth shape has a straight edge tooth shape, an arc tooth shape, etc. Straight edge cutters are the most common form of composite film bags. When using a toothed cutter, you must pay attention to the consistency of the upper and lower blades. For bags with different upper and lower sides, you must pay attention to the direction of the material or the installation position of the upper and lower cutters. To avoid the opposite of the upper and lower tooth shapes.

 

5. The sealing position of the back seal bag

The position of the back seal is determined according to the pattern design. The unsealing position is usually located at the center of the bag surface, but sometimes the beauty, continuity and integrity of the pattern are considered. The back-sealing position of the back seal deviates from the center line with the design pattern, and different products will be different.

When the operator is operating, sometimes the position of the pattern is not obvious, and this point is often ignored, and the operation is performed according to the back sealing line, which causes errors. Therefore, before starting the production, the production order should be carefully reviewed to avoid errors.

 

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