Electric heating – Metal heating – By arc
Patent
1998-10-28
2000-11-14
Heinrich, Samuel M.
Electric heating
Metal heating
By arc
2191217, 131281, B23K 2600, B23K 2610, A24C 514, A24D 302
Patent
active
061473197
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a perforating device for forming a web material with pores at regular intervals in the longitudinal direction of the web material, in particular to a perforating device adapted to the formation of pores in a tip paper web used in the manufacture of filter cigarettes.
BACKGROUND ART
A perforating device of this type is disclosed in Jpn. Pat. Appln. KOKAI Publication No. 5-138381, for example. The device of this publication includes a source of laser generation. The source of laser generation emits a laser beam continuously. The emitted laser beam is applied to a polygonal mirror in a rotating state. As the polygonal mirror rotates, it cyclically deflects the applied laser beam and converts it into a pulse laser beam. The pulse laser beam is divided into a plurality of beam segments through an optical system, and these beam segments are applied to a tip paper web for use as a web material. While this is done, the tip paper web is traveling, so that the beam segments form a plurality of rows of pores in the tip paper web. Thereafter, the tip paper web is cut to provide a tip paper piece with a given length in a filter attachment, and the tip paper piece is used to connect two cigarettes and a filter plug, whereby a double filter cigarette is manufactured. The double filter cigarette is cut in the center of the tip paper piece, whereupon individual filter cigarettes are obtained.
The perforating device described above has an advantage in being able to form a plurality of rows of pores in the tip paper web by using only the single source of laser generation.
However, the perforating device cannot easily cope with change of the type of the tip paper web. More specifically, the types of tip paper webs used in the manufacture of filter cigarettes, that is, the numbers and positions of rows of pores, vary depending on the brands of the filter cigarettes to be manufactured. The optical system should be changed in order to form tip paper webs with pores that vary in row number and row position. Changing the optical system requires adjustment of paths through which the beam segments are to pass. The replacement of the optical system and the adjustment of the paths. take much labor and time.
More specifically, the optical system of the disclosed perforating device includes a bisecting mirror. The bisecting mirror divides the pulse laser beam into two beam segments, and these beam segments form a row of pores on each of the left- and right-hand side portions of a tip paper web. It is very difficult, however, to make adjustment to guide the beam segments, divided by the bisecting mirror, to the tip paper web with the respective generation cycles and intensities of the beam segments kept equal. Therefore, the pores in each row are subject to variations in size and intervals, so that target air permeability cannot be given accurately to the tip paper web. In consequence, the quality of the filter cigarettes cannot be maintained with high accuracy.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a perforating device, in which the number and position of rows of pores to be formed in a web material can be changed with ease, and the air permeability of the web material can be maintained with high accuracy.
A perforating device for web material according to the present invention comprises running means for running a web material at a constant speed along a predetermined path of travel, and laser beam generating means for emitting a plurality of pulse laser beams toward the web material on the path of travel, thereby forming a plurality of rows of pores in the web material. The laser beam generating means includes a plurality of laser heads for emitting the pulse laser beams, and moving means for moving each laser head independently in the width direction of the web material.
According to the perforating device of the invention, the laser heads to be used are selected in accordance with the number of rows of pores to be formed in the web material.
REFERENCES:
patent: 3226527 (1965-12-01), Harding
patent: 4121595 (1978-10-01), Heitmann et al.
patent: 4297559 (1981-10-01), Whitman, III
patent: 4507535 (1985-03-01), Bennett et al.
patent: 4672168 (1987-06-01), Saunders et al.
patent: 5092350 (1992-03-01), Arthur et al.
patent: 5259401 (1993-11-01), Lange et al.
patent: 5341824 (1994-08-01), Fletcher et al.
patent: 5367144 (1994-11-01), Matsumura et al.
patent: 5595196 (1997-01-01), Salonen et al.
Fukuchi Junichi
Imai Kiyoshi
Takatsu Michiaki
Heinrich Samuel M.
Japan Tobacco Inc.
LandOfFree
Hole making device for web material does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hole making device for web material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hole making device for web material will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2067218