The bulging out of the center of the holder is called "diaphraming" and it is a common problem in certain types of holders that are sonically sealed. It can be seen quite often on NGC holders but the one pictured is a more extreme example of it. The early NGC holders (prior to addition of the cross bar to strengthen the holder) also diaphramed or bulged outward. The cross bar was probably an attempt to prevent this from occurring as well as secure the gasket.
盒子中心鼓起的情況被稱為“膜片現象”，這在某幾類聲波封裝的盒子中是一個常見的問題。NGC的盒子上也經常發(fā)現，不過圖片所展示的一枚屬于很極端的例子。
早期NGC盒子（在其添加十字桿來加強盒子之前）也有發(fā)現鼓起，十字桿可能也是作為防止鼓起的一種嘗試，同時也是為了固定墊圈。
NGC does have a very good holder but it is not without some "issues" that other services don't have. These flaws are common and usually the designer of the holder and the makers of the sealing machine tools work together to correct or improve design flaws and prevent these issues from occurring. Apparently, that didn't happen during tooling for production of the last couple of generations of NGC holders.
NGC確實擁有一個非常良好的盒子，但是也未能避免一些小問題。這些缺陷是常見的，通常都是由盒子設計者和封裝機器的生產者一起糾正或者改進設計缺陷，并避免再次發(fā)生這些問題。顯而易見的，在最近幾代的NGC盒子上并沒有發(fā)現同類問題了。
The center bulge is one of the holders most noticeable problems as is "Flashing". Flashing is the melted plastic that is extruded at the edge of the holder along the seam. This is the result of the top and bottom being uneven when set in the sealing machine and/or from the weld settings being a bit too high and too long. It is also a common problem in sonic welding.
中心鼓起是這些盒子其中一種最容易被注意到的外觀問題，同樣的，flashing 溢出是另一種很明顯的外觀問題。溢出是指溶解的塑料被擠出到盒子邊緣的接合處，這是由于封裝的時候盒子上半部和下半部凹凸不平和/或熔接的設定（溫度）過高和（時間）過長。這也是聲波熔接時常見的問題。
Less noticeable is the compacting of the raised edge on the face and back of the holder. This problem is also caused by the sealing machines settings applying too much pressure and for too long causing the horn impair the case during welding. While the raised edge on the edge of the face and back of the holder allow for stacking of the holders, they actually make the piece harder to weld. To compensate for this, weld pressure and time may be increased to ensure a proper seal.
較不為大家所注意的是盒子正面和背后的突出邊緣被壓平了，這個問題同樣是由于封裝機器設定時給予了太多的壓力和太長的時間，以致熔接時盒子被損傷了。
盒子的正反面的外圍突出邊緣是為了方便疊起多個盒子，這種設計實際令熔接更加困難。作為補償，熔接壓力和時間都需要相應增加以保證合適的熔接。
If you look at other holders such as PCGS, which is sealed in much the same was as NGC's holders, you will notice their design is significantly different and don't have these problems as a result. The raised rim is sectional on the PCGS holder and as a result it doesn't interfere with the weld in the same way.
如果你看一下其他品牌盒子如PCGS，他們以前和NGC盒子的封裝非常類似，但是現在你會發(fā)現他們的設計已經明顯不同，因此他們的盒子并沒有出現這些問題了。PCGS盒子的突出邊緣現在是局部段落的，因此熔接時可以不再受到類似的困擾。
Despite how the bulge and flashing may look, it doesn't mean the holder isn't sealed well. On the contrary, NGC has one of the best seals or weld of any of the holders currently in production, it just isn't always the cleanest looking.
鼓起和溢出的情況除了外觀不是很美觀以外，其實都不代表這些盒子沒有封裝好，相反，NGC擁有目前市場上最好的一種封裝或熔接盒子，只是有時候外觀看上去不那么整潔而已。
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