Pouch Machine With Sealer

Abstract

A pouch machine includes an infeed section, a sealing section, and an outfeed section. The infeed section provides a pouch or laminate to the sealing section, and the outfeed section receives the sealed pouch from the infeed section. The sealing section includes at least one sealer that has a sealing fixture disposed to move in a first direction toward and away from a sealing position. A linear actuator is mounted to provide a controlled motion in a second direction, that is not the first direction. A linkage is connected between the linear actuator and the sealing fixture. The linkage translates the controlled motion of the actuator into controlled motion of the sealer. The linkage preferably multiplies force when the sealer is in the sealing position, and multiplies distance / velocity when the sealer is retracted. The sealing fixture preferably includes a die backing member and a sealing die. The die backing member has at least one clip mounted on it. The clip includes a hook end, and has a first relaxed position and a second tension position. The sealing die includes at least one receiver that receives the hook end. When the clip is in the tension position, the sealing die is held against the die backing member.

Description

FIELD OF THE INVENTIONThe present invention relates generally to the art of bag making. More specifically, it relates to pouch machines, and methods of making pouches.BACKGROUND OF THE INVENTIONThere are many known machines and methods known for making bags and pouches. Intermittent motions machines are often used to make some pouches, such as those used in the medical field. Typically such medical pouches are made from a laminate film or a mono film. Laminate film, as used herein, includes a film made up of two or more layers, such as an upper layer that is sealed in various locations to a lower layer. The layers can be comprised of different materials.Generally, the prior art provides for intermittently advancing the laminate film. When the film is stationary, a sealing platen, cross sealer, or longitudinal sealer is lowered into contact with the film. Through a combination of pressure, temperature and time, an upper layer of the laminate is sealed to a lower layer. The platen typ...

AI Technical Summary

Benefits of technology

"The invention is a pouch machine that includes an infeed section, a sealing section, and an outfeed section. The sealing section has a sealer that can move vertically towards and away from a sealing position. The machine has a linear actuator that provides a controlled horizontal motion, which is translated into the vertical motion of the sealing fixture using a linkage. The linkage translates a first horizontal distance into a lesser vertical distance. The invention also includes a sealing fixture that has a die backing member and a sealing die, which can be held against the die backing member using a clip. The linear actuator can be a screw drive or a pneumatic cylinder. The sealing section can have additional sealing fixtures. The invention provides a machine that can efficiently seal pouches or laminates."

Problems solved by technology

The linkages in such systems are subject to wear and maintenance, as well as causing looseness in the system which could result in improper sealing.

Also, such systems require a load cell to measure the force applied by the platen, and required loss motion to control the force.

However, because this prior art patent uses force as its main control parameter, it requires an add-on force transducer and cannot rely on already available servo motor feedback, which adds cost and complexity.

Also, it teaches the use of a single servo motor, which can result in an unbalanced platen (i.e., more force on one side than the other).

Moreover, it is primarily concerned with applying sufficient force and does not recognize that the force should be controlled to prevent fracturing of the laminate film.

This design avoids the linkages of the prior art using under mounted servo motors, However, it requires two actuators (which can be expensive) to obtain the desired force, and requires space above the machine for the actuator (which moves vertically) to be mounted, and cannot be mounted beneath the machine.

However, it is sometimes desirable to change the sealing die, due to wear or to provide a different sealing profile.

In such cases the entire sealer could be changed, but that can be costly and time consuming.

Unscrewing the sealing die from the die backing member requires a tool and is time consuming.

Such clips are expensive.

Accordingly, a pouch machine that moves a platen, cross sealer, or longitudinal sealer that avoids complex linkages, applies force evenly, and is not excessively expensive is desirable.

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