Design automatic carton box openener

[Barts5]

Hi guys!
Since a few months I work at plant where they make rice.
Now I have to design an automatic carton box opener, but I don't know how to start.
Afther the carton box is filled, it has to be re-openend if there is any quality issue with the rice.
The machine has to cut (or something else) the box to open it and afther that, the machine has to empty the carton box so the plastic bags come out.
All the boxes have the same width but not the same height and length.
One of the targets is also that it should empty 600 boxes/hour but this isn't the main goal.
So if there is a design that could empty less then 600 boxes / hour it's still fine.

I hope you guys can help me,

In the attachment you find a file with the carton box with the platic bags in it.

http://files.engineering.com/getfil...7512-4bd1-aff3-d6b938afedba&file=P1050724.JPG

 

[Barts5]

My boss doesn't want to use a knife because he's afraid that it will influence the quality of the rice.
Weaken the box by humidify also isn't an option becaus of quality issues.
Now I'm more looking for an option to open the box at the top, where the box gets closed.

 

[IRstuff]

"My boss doesn't want to use a knife because he's afraid that it will influence the quality of the rice."

This seems like an important requirement. Please clarify how it's supposed to "influence" the quality of the rice.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

faq731-376 forum1529

 

[Barts5]

It will influence the quality of the rice, because it generates to much dust.
A static knife could well be an option, because it generates just a small amount of dust which can be filtered.

 

[JNieman]

I don't understand why your boss cares about influencing the quality of rice once it has already failed quality checks.

 

[IRstuff]

You stated the rice was in plastic bags?

How can a knife generate more dust than what amounts to a saw?

A failed box requires extra handling anyway, to sort out good rice from bad, so dust would seem to be a minor issue.

Moreover, at the heart of the problem is the adage that you should find and fix faults BEFORE you have to take things apart to repair or replace them; that means that your company should be looking at how to eliminate boxing bad rice in the first place, which would therefore eliminate the need for a specialized piece of hardware for re-opening them. Your stated design goal of 600 (bad) boxes/hr is insanely ludicrous; how many boxes are expected to pass? If the percentage of failures is not less than 0.1%, then there's something seriously wrong in your manufacturing process.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

faq731-376 forum1529 Entire Forum list

http://www.eng-tips.com/forumlist.cfm

 

[Barts5]

@JNieman there are little holes in the plastic bags, I think that's the reason why. I also don't really understand why it's not an option because like you said it already failed the quality control.

@IRstuff I think a saw generates more dust because it makes an back-and forth motion. It is pretty hard to fix the faults who generates the bad boxe because they are the result of human faults.

It's possible to open the box at the bottom or top side with a static knife. The next part is to seperate the ricebags from the box. Is there a possibilty with a twisted belt so the ricebags slide out of the box?