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Can’t the girl really unscrew the bottle cap?
Feb 11, 2018

It's true that women can't unscrew the caps on their own strength, and that's not the quality of bottled drinks.

Usually, they can't unscrew the bottle, such as the PET plastic bottle shown in the figure above, the bottle cap of the usual size is 28mm, 30mm, 38mm. This plastic bottle, combined with a plastic spiral bottle cap, is the most widely used packaging method in the beverage market.

The national standard GB/T 17876-2010 container - plastic anti-theft caps

Is there any difference regardless of the size and shape, this kind of cap must meet two functions: one is to ensure that the seal, the second is "security".

Seal is easy to understand, the meaning of "security" is to inform consumers, has never been open this bottle of drinks.It is on the cover body and anti-theft ring between the bridge, drink bottled drinks in a look at the chart will be able to understand, once the cap has been opened, broken bridge cannot be recovered

Means to unscrew a bottle of drink, in addition to deal with the combination of cap and screw thread bottle friction, still have to wring cap at the bottom of the bridge.

And loosen screw combination, or wring even bridge that is really "turned on" cap and the "strength", are measured by a specific indicator, is called a "torque".This concept refers to the open packaging security caps, the maximum torque, unit of cattle meters (N, m).

Used to measure the torque wrench

Under the same conditions, the smaller torque, bottle caps, the easier it is turned on to consumers more friendly, but the manufacturer is not unlimited reduce torque, the reason is simple: a teenager is caused by untight seal bottle sealing torque, which is the risk of even at one over ten thousand, is better than 30% consumer hard to unscrew it more serious consequences.

Because the provisions of the national standard of cap sealing torque is broad, and drink factory will be according to own actual production, a specific torque range, no leakage, and at the same time most convenient to open.

The torque range is generally not made public, but some researchers to 1.2 N·m bottles with standard of sealing, the samples from 20, leakage phenomenon are observed.Therefore, beverage manufacturers set torque limit may be more than 1.2 N·m.

Hot filling sealing machine torque less than 1.2 N·m

What does it mean to the torque limit for women?

In 2008, the two researchers of human body engineering of wuhan, a sampling survey.They collected from five provinces in 150 adult female screw cap torque, in order to rule out regional differences bring strength of female growth.

Table "percentile" refers to "strength" is more than X % women cap open ability, such as P5 = 0.81, meaning there is 5% less than 0.81 N·m torque

According to their published data, if the seal the lower limit torque 1.2 N·m, have at least 10% of te adult women cannot be unscrewed the cap.

At the same time, they also measured the common 28 mm beverage bottle cap torque on market situation.

According to its maximum "loosen the moment", ensure open Coca-Cola need torque is 1.32 N·m, close to the women's 50 points a 1.32 N·m torque that is to say, nearly half of adult women may encounter "won't unscrew the Coca-Cola" problem.

If women consider more juice preferences, they will be more likely to encounter difficulties, such as minute maid citrus juice bottle enough baffled most adult women.

In addition, the study of the sampling data based on 16 to 55 years old women, thinking of children and the elderly, the proportion of failure will be higher.

Above is 28 mm cap, and in general, bottle caps, unscrew the difficulty also increases, so frustrated at 30 mm and 38 mm cap will be more women.

It can't solve this problem?

Of course not.In fact, drink factory has been trying to solve, change the bottle shape, make it more good twist design also emerge in endlessly.

Design other shapes of bottle caps, or add a cover, use lever principle can make drinks are easier to open.

But at least in the short term, they are doomed to not put so much effort on this issue.The reason is simple: they must consider the cost.And the winner of the Chinese beverage market, has always been that on the basis of guarantee the quality of basic, do everything possible to lower prices, improve the efficiency of the shop goods enterprises.Holding the note in the this is the vast majority of Chinese consumers choose to answer.

In fact, all the Chinese people also have been enjoying this answer.In 500 ml bottles of Coca-Cola, for example, China's retail price of 3 yuan, more than 50% lower than almost all countries, those countries with China similar degree of development, such as South Africa, Russia, Turkey, whether or not the average price is low, want to drink Coca Cola, are required to take two or three times the price of China.

Cheap price, mainly from China's beverage market benefits from the scale of production and sales.

But it also illustrates the difficulty of it is to be a product upgrade, even if all companies at the same time the women won't unscrew cap as a big problem to solve, social phenomena, the corresponding mold, production line, and a number of packaging related quality standards have changed accordingly, pay a heavy price, also probably because the technology stability problems and cannot meet the original production.

However, we also have another solution: men, please understand, really have a lot of women cannot unscrewed the cap and they are not playing, more not ulterior motives, natural and unrestrained, this just help a little busy.