Package making – Apparatus for forming or partially forming receptacle and... – Forming by opening or setting up collapsed receptacle
Patent
1995-12-11
1997-07-01
Coan, James F.
Package making
Apparatus for forming or partially forming receptacle and...
Forming by opening or setting up collapsed receptacle
53DIG2, 1565802, B65B 4326
Patent
active
056426062
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a sealing apparatus for packaging containers.
BACKGROUND ART
Conventionally, various types of packaging containers having different shapes have been used for liquid foods such as soft drinks and milk. One such packaging container is a gable-top type packaging container which has a roof-shaped top. When the gable-top type packaging container is used, a carton blank is first formed into a square tubular carton by a filling machine, and a spout is then attached to the carton. The bottom end of the carton is then sealed by mandrels to make a bottom. A liquid food is then placed in the carton having a bottom through the top opening thereof.
After the liquid food has been placed in the carton, the top portion of the carton is folded along predetermined pleat lines, and is then sealed.
FIG. 1 is a side view of a square tubular carton which is used for forming a gable-top type packaging container, FIG. 2 is a side view of a packaging container, and FIG. 3 is a perspective view of a packaging container.
In these drawings, numeral 11 denotes a square tubular carton made of a packaging material, and numeral 12 denotes a spout attached to a predetermined position of the carton 11.
A plurality of pleat lines a through f are formed on the square tubular carton 11. The carton is folded along the pleat lines a through f to form a triangular panel 15, folding panels 16, inner sealing fins 17, outer sealing fins 18, and slanting roof panels 19. After the carton is folded along the pleat lines a through f, each pair of sealant layers of the inner sealing fins 17 facing each other is fused while each pair of sealant layers of the outer sealing fins 18 facing each other is also fused, thereby forming a packaging container 13.
An object of the present invention is to solve the above-mentioned problems in the conventional sealing apparatus for packaging containers and to provide an improved sealing apparatus for packaging containers which does not produce dust from an end surface of a paper substrate, which dust would otherwise fly around.
DISCLOSURE OF THE INVENTION
To achieve the above object, a sealing apparatus for packaging containers according to the present invention can be applied to production of a gable-top type packaging container in which a square tubular carton is folded along pleat lines, and each pair of sealant layers of a sealing fin portion facing each other is fused for sealing, whereby the gable-top type packaging container is formed.
The sealing apparatus according to the present invention includes an anvil for supporting a sealing fin portion, a horn composed of a columnar portion and a converging portion, and means for pressing the sealing fin portion against the anvil through the tip of the horn and for transmitting ultrasonic vibration to the sealing fin portion. The horn transmits the ultrasonic vibration to the packaging material, thereby fusing each pair of sealant layers of the sealing fin portion to effect sealing.
In addition, there is provided ultrasonic vibration absorbing means between the tip of the horn and the edge portion of the sealing fin portion for absorbing ultrasonic vibration.
When ultrasonic vibration is transmitted to the sealing fin portion, the sealing fin portion 21 is excited to transmit the vibration toward the edge portion. However, since the vibration is absorbed by the ultrasonic vibration absorbing means, the vibration does not reach the edge portion. Accordingly, it is possible to prevent the generation of dust from an end surface of the paper substrate which is exposed to the outside at the edge portion of the sealing fin portion.
In another sealing apparatus for packaging containers according to the present invention, the ultrasonic vibration absorbing means is a projection which is formed on the anvil for holding a packaging material in cooperation with the tip of the horn. In this case, since ultrasonic vibration is absorbed by the anvil through the projection, the ultrasonic vibration is not transmitted to the ed
REFERENCES:
patent: 3468731 (1969-09-01), Obeda
patent: 4159220 (1979-06-01), Bosche et al.
patent: 4241560 (1980-12-01), Deimel et al.
patent: 4251303 (1981-02-01), Deimel et al.
patent: 4403465 (1983-09-01), Bachner
patent: 4534818 (1985-08-01), Kreager et al.
patent: 4581873 (1986-04-01), Knuppertz et al.
Coan James F.
Kim Gene L.
Tetra Laval Holdings & Finance S.A.
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