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Hello. Thanks for the question.
It sounds like you may be dealing with a foreign body obstruction. Plastic, as I'm sure you know, does not digest in the stomach or intestines. The vomiting may be due to one of 2 things. It's either because he has an obstruction or it's just irritation from the plastic in the stomach.
X-rays are needed to determine if there is an obstructive pattern in the small intestine. If so, then surgery will be needed to remove the obstruction. If the x-rays are normal, then I would treat with anti-nausea meds and fluids and allow him to pass any pieces still present. Usually once they start vomiting, it's due to an obstruction. There's a chance he won't need surgery, but I'd venture to guess that surgery is going to be in his future.
I hope this helps, let me know if you have any other questions.