Package making – Closing packages and filled receptacles – Including provision for pleat of cover overhang
Patent
1995-06-23
1999-08-10
Coan, James F.
Package making
Closing packages and filled receptacles
Including provision for pleat of cover overhang
53DIG2, 533746, 83956, B65B 5110
Patent
active
059340436
DESCRIPTION:
BRIEF SUMMARY
This invention relates to web cutting apparatus, particularly but not exclusively as employed for severing webs in packaging or wrapping processes.
According to one aspect of the invention apparatus for making successive longitudinally spaced cuts in a web comprises means for moving the web, means for periodically bringing a cutter into the region of the web, and means for producing high frequency relative vibration between the cutter and the web, so that the cutter makes at least one cut, having at least a portion extending in a transverse direction of the web. The vibration may have a primary amplitude transverse to the web, either in its thickness direction or across its width, or its primary direction may be longitudinal relative to the web. Preferably the cutter cooperates with an anvil (which term is used herein to include any counter surface) and the vibration producing means produces relative vibration between the cutter and the anvil. Preferably the vibration producing means comprises an ultrasound generator. In a preferred arrangement the anvil is subjected to ultrasound vibration, although the cutter itself may be vibrated, either in a direction across the web width (i.e. in a sawing action) or in a direction parallel to the thickness of the web (in a crush-cut action).
The cutter is preferably moved with the web, (e.g. by being mounted on a roller), although it need not move at the same speed as the web. The anvil may be stationary (apart from the generated vibration) or may move with the web or the cutter, although again not necessarily at the same speed. The device may be arranged to sever portions of the web from the remainder of the web, e.g. by severing successive leading portions. Where the anvil is a movable member, e.g. a rotary drum, sections severed from the web may be subsequently conveyed on the anvil. Alternatively, where the cutter is mounted on a movable member the severed sections could be subsequently conveyed on the member.
In one application the invention is embodied in a machine for producing packages containing tea or other infusible material. Thus, a double ply web containing spaced portions of infusible material may be subjected to cutting by a device according to the invention in which the cutter has a cutting edge which surrounds the portion of infusible material and cuts it out from the web. The cutting edge may thus define the shape of the package containing infusible material produced from the web. It will be understood that the edges of any such package have to be sealed to prevent the infusible material escaping. Sealing may be carried out by rollers or other suitable means arranged upstream of the cutting device and synchronised with it so that the web is cut in a region such that the cut edge or edges of the packet are separated from the infusible material by a sealed portion of web.
As an alternative to providing such separate sealing means, and in accordance with another aspect of the invention, a cutting device (which may be, but is not necessarily, constructed in accordance with said one aspect of the invention) comprises means for performing a sealing operation on an adjacent portion of the web substantially simultaneously with the cutting operation. In this case, the device preferably performs sealing and cutting with the assistance of ultrasound. A suitable cutting and sealing element, which could be carried by a rotary drum for cooperation with a stationary ultrasonically-vibrated anvil comprises a relatively flat portion for sealing and a relatively narrow edge portion e.g. abutting the flat portion, for cutting. Preferably the sealing portion is arranged to contact a downstream portion of the web relative to the cutting edge. Where sealing and cutting are carried out in separate processes with the sealing operation performed on the web upstream of the cutting operation, in order to provide adequate tolerance for registration at the cutting operation the sealing width may need to be wider than strictly necessary to provide an adequate seal. By combining
REFERENCES:
patent: 3272682 (1966-09-01), Balamulth
patent: 3308003 (1967-03-01), Reans
patent: 3312134 (1967-04-01), Roney
patent: 3438295 (1969-04-01), Heinz et al.
patent: 3939033 (1976-02-01), Grgach et al.
patent: 4043094 (1977-08-01), Bohannon, Jr.
patent: 4517780 (1985-05-01), Kreager
patent: 4713132 (1987-12-01), Abel et al.
patent: 4765118 (1988-08-01), Akutsu
Aindow Alan Michael
Bird Stephen William
Cleall Andrew John
Haddow Philip Gordon
Seaward David Robert
Coan James F.
Kim Gene L.
Molins PLC
LandOfFree
Web cutting apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Web cutting apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Web cutting apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1108173