Electric heating – Heating devices – Combined with pressure application means
Reexamination Certificate
2003-07-28
2004-11-16
Jeffery, John A. (Department: 3742)
Electric heating
Heating devices
Combined with pressure application means
C156S515000, C156S251000, C156S583100, C219S521000
Reexamination Certificate
active
06818863
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to an electric heat sealing apparatus packaging articles with plastic films, and more especially to an electric heat sealing apparatus which proceeds a cutting process together with a sealing process, thereby a neat and airtight package effect is achieved.
2. The Related Art
Electric heat sealing apparatuses have an extensive application in the field of plastic packaging. Most often an electric heating wire is employed in a traditional electric heat sealing apparatus to seal articles with plastic film. However, the traditional electric heat sealing apparatus has two serious drawbacks. Firstly, after sealing process, remains of the package material can't be cut simultaneously. Secondly, although the electric heating wire can be bent into multi-shapes to meet different sealing shape demands, there always remains an unsealed gap along the seal as the bent electric heating wire isn't able to form a complete airtight configuration.
Another traditional electric heat sealing apparatus makes an improved design in order to overcome the drawbacks above mentioned. The traditional electric heat sealing apparatus provides a sealing member with an electric heating tube therein. A heating ring is formed in a rim of the sealing member, and a cutting ring extends downwardly from an exterior edge of the heating ring. On the course of packing, the plastic film is sealed by the heating ring and cut simultaneously by the cutting ring. The second traditional electric heat sealing apparatus also has several drawbacks. Due to plastic contractibility, the package appearance tends to wrinkle and leakage may occur from the seal. Meanwhile, because the plastic films at the seal and the cut are heated together, a temperature of the plastic film at the cut maybe so high that an excessive deformation of the plastic film will result. With the result that it is very difficult to cut the plastic film smoothly, even more seriously, the plastic film adheres to the cutting ring.
SUMMARY OF THE INVENTION
Thus, an objection of the present invention is to provide an electric heat sealing apparatus which has a seal-cut portion. The seal-cut portion has a sealing portion and a cutting portion which form a narrow groove therebetween. On the course of packing, the seal-cut portion seals and cuts the plastic films simultaneously thereby a neat and airtight package effect may be achieved.
To attain the above object, the present invention provides an electric heat sealing apparatus which comprises a lower support board, an upper support board and a lateral board. The upper support board is arranged above the lower support board. The lateral board is located between the lower and the upper support board with a moving space formed therebetween. A receiving board is fixed on a top face of the lower support board. The receiving board forms a receiving hole. A tray is received in the receiving hole. A lower driver is fixed on a bottom face of the lower support board, passing through the lower support board and engaging with the tray so as to drive the tray moving up and down. A sealing plate is arranged in the moving space. A seal-cut portion extends downwardly from a rim of the sealing plate which forms an opened recess surrounded by the seal-cut portion. The seal-cut portion comprises a sealing portion and a cutting portion which define a narrow groove therebetween. An upper driver is fixed on a top face of the upper support board, passing through the upper support board and engaging with the sealing plate in order to drive the sealing plate moving up and down in the moving space.
In packaging, the sealing plate is heated to arrive at a predetermined temperature by an exterior power source. The heated sealing plate is then driven by the upper driver to move downwardly to press on the article placed on the tray and then the plastic film covered on the article is sealed by the sealing portion and cut simultaneously by the cutting portion.
As mentioned above, the electric heat sealing apparatus of the present invention takes an improved configuration which provides a sealing portion, a cutting portion and a narrow groove therebetween. Thereby, the plastic films can be cut smoothly together with tightly seated process. Further a neat and airtight package effect is achieved, and a convenient and secure operation is provided by the present invention.
REFERENCES:
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patent: 3144372 (1964-08-01), Peterson et al.
patent: 3346435 (1967-10-01), Beck
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patent: 3520755 (1970-07-01), Raffaelli et al.
patent: 3657055 (1972-04-01), Nichols
patent: 3682748 (1972-08-01), Kimball
patent: 5997684 (1999-12-01), Kusz
patent: 6254707 (2001-07-01), Sfikas et al.
Huang Ming
Tang Ai-Ming
Cheng Uei Precision Industry Co. Ltd.
Jeffery John A.
Rosenberg , Klein & Lee
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