1. A method of making a bag in a continuous in-line process; the method comprising:
(a) continuously advancing a web including a first layer on top of a second layer of polymeric film along a processing line, and while the web is advancing:
(i) sealing a portion of the first layer and second layer together to result in a seal region having a seal region edge;
(ii) based on a predetermined time from the sealing step, applying a perforation line to the web adjacent to the seal region to result in a perforated line having a perforation edge;
(iii) taking an image of the seal region and perforated line;
(iv) using the image, counting pixels between the seal region edge and the perforation edge to result in an actual pixel count;
(v) calculating a pixel count error by subtracting the actual pixel count from a predetermined pixel count setpoint; and
(b) repeating steps (i)-(v) and adjusting the predetermined time of step (ii) based on the pixel count error.
2. A method according to claim 1 wherein the step of adjusting the predetermined time of step (ii) includes determining the polarity of the pixel count error and advancing or retarding the step of applying a perforation line based on the polarity.
3. A method according to claim 2 wherein the step of adjusting the predetermined time of step (ii) includes advancing or retarding the step of applying a perforation line based on the polarity and in proportion to a magnitude of the pixel count error.
4. A method according to claim 3 wherein the step of adjusting the predetermined time of step (ii) includes controlling a perforation knife motor with a servo drive based on the pixel count error.
5. A method according to claim 1 wherein the step of sealing further includes triggering the step of taking an image using a camera of a downstream seal region and perforated line.
6. A method according to claim 5 wherein the step of taking an image further includes activating a strobe lamp to provide light on the seal region and perforated line when the image is taken.
7. A method according to claim 6 wherein the camera includes a central processing unit; and the steps of triggering, activating a strobe lamp, counting pixels, calculating, and adjusting the predetermined time of step (ii) are each done by the central processing unit.
8. A method according to claim 1 wherein the step of sealing a portion of the first layer and second layer together is done by rotating a seal drum having at least one seal bar against the web.
9. A method according to claim 1 wherein the step of applying a perforation line to the web adjacent to the seal region includes applying the perforation line between a pair of seal regions.
10. A method according to claim 1 wherein the step of applying a perforation line to the web adjacent to the seal region includes applying the perforation line no greater than 3 mm from the seal region.
11. A method according to claim 1 wherein the step of sealing a portion of the first layer and second layer together results in a seal region having a width no greater than 3 mm.
12. A method according to claim 1 wherein the step of continuously advancing a web including a first layer on top of a second layer of polymeric film along a processing line includes advancing a continuous tube of polymeric film.
13. A bag made according to the process of claim 1 and having a length between the seal region edge and the perforation edge no greater than 3 mm.
14. An arrangement to make bags in an in-line process; the arrangement comprising:
(a) a central processing unit;
(b) a camera oriented to take an image of a bag in the in-line process based on a triggering signal received from the central processing unit and provide an image to the central processing unit;
(i) the central processing unit being programmed to process the image and calculate a timing signal based on the image;
(c) a cylindrical rotatable drum having at least one seal bar; the drum providing the triggering signal to the central processing unit; and
(d) a perforation knife controlled by a servo drive; the perforation knife being downstream of the drum; the servo drive receiving the timing signal for activating the perforation knife from the central processing unit.
15. An arrangement according to claim 14 further comprising a strobe lamp receiving the triggering signal from the central processing unit and activating based on the triggering signal.
16. An arrangement according to claim 14 wherein the drum includes at least 4 seal bars located 90\xb0 apart.
17. A process for making a bag in a continuous in-line process; the process comprising:
(a) continuously advancing a web including a first layer on top of a second layer of polymeric film along a processing line, and while the web is advancing:
(i) taking an image of a first seal region;
(ii) using the image, counting pixels from an edge of the first seal region to a fixed point to result in an actual pixel count;
(iii) calculating a pixel count error by subtracting the actual pixel count from a predetermined pixel count setpoint; and
(iv) applying a perforated line to the web based on the pixel count error.
18. A method according to claim 17 wherein the step of applying a perforated line includes determining the polarity of the pixel count error and advancing or retarding the step of applying a perforated line based on the polarity.
19. A method according to claim 18 wherein the step of advancing or retarding the step of applying a perforated line based on the polarity is based on a proportion to a magnitude of the pixel count error.
20. A method according to claim 17 wherein:
(a) the step of taking an image of a first seal region includes taking an image of a first seal region and a first perforated line;
(b) the step of counting pixels includes counting pixels from the first seal region edge to an edge of the first perforation line to result in the actual pixel count; and
(c) the step of applying a perforated line to the web based on the pixel count error includes applying a second perforated line to the web upstream of the first seal region.
21. A method according to claim 17 wherein:
(a) the step of taking an image of a first seal region includes taking an image of a first seal region devoid of a perforated line;
(b) the step of counting pixels includes counting pixels from a leading edge of the first seal region edge to result in the actual pixel count; and
(c) the step of applying a perforated line to the web based on the pixel count error includes applying a perforated line to the web downstream of the first seal region.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A system for detecting antenna coupling and for providing feedback cancellation to reduce or eliminate antenna coupling, the system comprising:
a signal receiver, configured to be coupled to a signal receiving antenna, for receiving signals;
a signal amplifier, coupled to a signal feedback cancellation circuit and to said signal receiver, and responsive to said received signals and to a feedback cancellation signal, for amplifying said received signals;
a signal transmitter, configured to be coupled to a signal transmitting antenna, for transmitting amplified signals from said signal amplifier; and
the signal feedback cancellation circuit, configured to be coupled between said signal receiver and said signal transmitter, and responsive to said received signals and said amplified signals, for detecting signal coupling being between said receiving antenna and said transmitting antenna, wherein said signal feedback cancellation circuit includes a time domain feedback cancellation circuit, wherein said time domain feedback cancellation circuit further includes a white noise generator generating a white noise signal, said time domain feedback cancellation circuit coupled to said signal feedback cancellation circuit and configured for cross-correlating the white noise signal to the received signal, for developing the coefficients of the feedback cancellation circuit, and for causing said signal feedback cancellation circuit to adjust for antenna coupling between said signal receiver and said signal transmitter, and responsive to said coupling, for providing a feedback cancellation signal to said signal amplifier having a signal magnitude and strength for canceling said antenna signal coupling.
2. The system of claim 1, wherein said received signals include communication signals.
3. The system of claim 2, wherein said communication signals include cell phone telecommunications signals.
4. The system of claim 3, wherein said communication signals include TCPIP signals.
5. The system of claim 1, wherein said signal feedback cancellation circuit includes a frequency domain feedback cancellation circuit.
6. The system of claim 1, wherein the white noise signal is not modulated and includes a band of frequencies that is not less than a passband width of the signal amplifier.