Apparatus and method for sealing box blanks

Details Apparatus and method for sealing box blanks Apparatus and method for sealing box blanks

1989-03-02

1990-12-25

Schmidt, Frederick R.

Manufacturing container or tube from paper; or other manufacturi

Container making

Rigid container

493 72, 493135, 493144, 493179, 493182, 493423, 493441, B31B 164

Patent

active

049799320

ABSTRACT:
A method and apparatus for the manufacture of folded paper boxes with a hemmed seal. One of two edges to be overlapped is skived and folded into a hem. After the edges are locally heated, blanks move individually and successfully along a conveyor for folding and sealing. Just before sealing, the hemmed edge passes between a hem holder and the conveyor to maintain the hemmed edge. The hem holder is heated to prevent the edges from cooling. In one embodiment hot air directed onto the hem from the hem holder forms an air cushion between the hem and the hem holder thereby to minimize any contact between the hem holder and the blank.

REFERENCES:
patent: 3416411 (1968-12-01), Hittenbrger
patent: 3572221 (1971-03-01), Baum
patent: 3850085 (1974-11-01), Klemm
patent: 4469542 (1984-09-01), Reil
patent: 4547183 (1985-10-01), Mowry
patent: 4708708 (1987-11-01), Fries, Jr.

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