JPS6219521Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to defining the relationship between the rotational peripheral speeds of each feed roller provided in a three-way seal packaging device for feeding a film.

The three-sided seal packaging device will be explained based on the drawings. Reference numeral 1 denotes a packaging film wound onto a reel, and this film 1 is supplied from feed rollers 2 and 3 to a bag making machine 5 via a guide roller 4. On the other hand, the object to be packaged 6 is pushed into the bag making machine 5 by the chain blade 8 of the entrance conveyor 7. after that,
The packaging film 1 is fed by tension rollers 9 and 10 with the object to be wrapped 6 contained therein. Further, the film 1 is fed by vertical sealing rollers 11 and 12, and since these rollers 11 and 12 are heated by heaters, the edges 1A of the film are continuously vertically sealed when passing through the rollers. Ru. A lead conveyor 13 feeds the packaged object 6 while being guided, and the end sealer 1
4 and 15, horizontal sealing and cutting are performed, and the product W is made into a single unit and sent to the exit conveyor 16.
Submitted by.

The present invention aims to obtain a good seal by regulating the peripheral speeds of the delivery roller, tension roller, and vertical seal roller of this three-sided seal packaging device.

The three-sided seal packaging device includes a feed roller 2,
A bag making machine 5 is provided between the bag making machine 3 and tension rollers 9 and 10. In order for the film 1 to be reliably made into a bag by the bag making machine 5, the film must always be stretched. For example, approximately 700 for CPP25μ
~2000g, for laminated film
If a tension of 1,000 to 5,000 grams is applied, the film will be transferred through the bag making machine without meandering. However, the optimum film feeding speed varies depending on the film material, film width, and ambient temperature. To this end, the tension roller is equipped with a speed change mechanism, and the roller is equipped with a structure that allows it to slip.

Next, the tension of the film between the tension rollers 9, 10 and the vertical seal rollers 11, 12 is as follows:
Assuming that the above upper limit value is set, film 1
If it is stretched too much by the vertical seal rollers 11 and 12, a seal with excellent airtightness cannot be obtained.

The present invention aims to regulate the rotational peripheral speed of each roller within a predetermined range, and in particular to provide sufficient tension between the feed roller and the tension roller, and to set the tension between the tension roller and the vertical seal roller to an extent that does not impede the flow of the film. The aim is to improve sealing performance by adjusting the Specifically, the circumferential speed of the tension rollers 9 and 10 is made faster than the circumferential speed of the delivery roller. For example, if a 2Kg tension is applied to a CPP25μ width 200mm film, the film will elongate by approximately 2%, and if a laminate film is applied a 5Kg tension, it will elongate by 1%.
% elongation occurs. Since the tensile stress of each film is 20Kg and 50Kg, these values must not be exceeded.

The inventors of the present invention conducted experiments using various films and found that the circumferential speed of the roller rotated within the range of delivery roller: tension roller of 1:1.05 to 1.10, and vertical seal roller: tension roller of 1:1.003 to 1.03. In other words, the circumferential speed of the tension roller is 1000
When the circumferential speed of the vertical seal roller is 970~
997, If the rotational speed of each roller is set so that the relationship between 909 and 952 is satisfied for the circumferential speed of the delivery roller,
It was found that the running properties and sealing properties of the film were further improved.

To summarize this relationship, a good seal can be obtained by regulating the rotational speed of each roller so that the circumferential speed of the film feed roller in a three-way seal packaging device is in the relationship of tension roller > vertical seal roller > delivery roller. As a result of experiments, it was found that

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of the three-sided seal packaging device, and FIG. 2 is a side view of the tension roller. In the drawings, 1 is a film, 2 and 3 are film delivery rollers, 4 is a guide roller, 5 is a bag making device, 6 is an object to be packaged, 7 is an entrance conveyor, 9 and 10
is a tension roller, and 11 and 12 are vertical seal rollers.

Claims (1)

[Scope of utility model registration request] In a three-way seal packaging device that has a delivery roller, a tension roller, and a vertical seal roller for feeding the packaging film, and a bag forming device is disposed between the delivery roller and the tension roller, the circumferential speed of these rollers is A three-way seal packaging device characterized in that the feed roller: tension roller rotates in a ratio of 1:1.05 to 1.10, and the vertical seal roller: tension roller rotates in a ratio of 1:1.003 to 1.03 to feed a packaging film.