Japanese to English Tech/Engineering Food & Drink patent relating to 3-layer confection

I came across the term or terms つまり不良 in a patent relating to equipment for making a 3-layer confection. I don’t know if this all one word or if it is 2 words. i.e., つまり and 不良. However, the same sentence contained the term でつまり停止, which again could be one or two words, depending on the author’s intent. Here is the sentence:
本実施例においては，図2に示すような3段サイジングのリングカッター方式を採用した。従来の包装工程で使用するガムスラブの厚みにするための圧延ローラーにおいては，幅広ガムシートが流れてくると，この工程でつまり不良が発生するか，後工程（包装）でつまり停止，稼働率低下の要因となっていた.
I would tentatively translate this as:
In this embodiment, the 3-stage sizing ring cutter shown in Fig. 2 was used. In the prior art, when a wide gum sheet was being processed in the roller used to adjust the thickness during the packaging process, either a filling defect [?] occurred or, in the next process (packaging), a jam [?] occurred, causing a drop in productivity.
Both terms are unclear to me.
I would appreciate any help with these. I was thinking maybe the "tsumari" part was from tsumaru, to fill.