羞羞视频

We see various containers on roads and streets every day. Have you ever wondered why container surfaces are corrugated instead of smooth? Is it just for appearance? No! The official name of these corrugations is "corrugated bulkhead," and its core function is to "achieve the maximum effect with the minimum material."

Think about it: the steel plates used for containers are only about 1.5mm thick, thinner than a coin. But when pressed into corrugations, they are like adding an "invisible skeleton" to the thin steel plates — the effective cross-sectional thickness increases significantly, and the bending and compression resistance capabilities are maximized. Even when hit by strong winds and waves at sea, or when the inner walls are bulging from fully loaded cargo, the container can stand firm without deformation. Moreover, this design reduces the weight of the container body. These corrugations are both the "protective armor" of the container and a "cost-saving tool" for the industry. No wonder they have been a standard feature since containers were invented in 1956.

Of course, the corrugations are not designed arbitrarily. The International Organization for Standardization (ISO) has strict restrictions on the corrugation parameters of ordinary containers, such as a wave height of 25-30mm and a spacing of 50-60mm.

Speaking of this, let’s test you: some refrigerated containers for fresh produce and special containers for heavy machinery seem to have wider corrugation spacing than ordinary containers. Do you know why?

First, for refrigerated containers: the wider corrugation spacing is essentially to make room for the refrigeration system and ensure smooth circulation of cold air. Refrigerated containers need to install evaporators and lay air ducts; too dense corrugations will block equipment installation and hinder cold air circulation like "small fences." Additionally, wider corrugations reduce the contact between the container wall and the insulation layer, slowing down the loss of cold air through the metal wall and keeping fresh produce in a low-temperature "fresh-keeping cabin."

Second, for special containers for heavy machinery: the wider corrugations are to withstand heavy pressure without collapsing and facilitate fixing without damaging the cargo. Heavy machinery often weighs several tons, and its contact area with the container wall is small, which easily deforms the wall. Wider corrugations can distribute the pressure to the "peaks" and "valleys" of the corrugations, like adding thicker "load-bearing beams" to the wall. At the same time, the flatter surface of wider corrugations will not scratch the machinery shell and can easily install fixing brackets, keeping heavy equipment "stationary" during transportation.