Why is the corner block set at 16 mm?

Answer: That step lets the corner crush first and the shell load later, absorbing the first stage of impact.

How is the 30/45 kg/m3 gradient layered?

Answer: The 45 kg/m3 layer sits against the shell and the 30 kg/m3 layer against the load, with thickness split by cavity depth and ribs holding them in place, joining the two stiffness stages into one falling curve.

How is the 42 g peak read?

Answer: The six are judged separately with no merged mean, and two consecutive orientations under 42 g count as stable.

What does the -25 C retest check?

Answer: Whether lid pressure drop stays within 0.25 kPa / 10 min, read at the end of the 10 min window; temperature is the only change between rounds, with gasket and latches left alone.

How is a drop-proof batch closed out?

Answer: Take the thinnest block whose two peaks both sit under 42 g and drop anything thinner; samples come from the batch ends and a mid interval, and a crossing sends the mould back.

Industrial sensor drop-proof portable case

Quick answer: An Industrial sensor drop-proof portable case pairs a 16 mm corner block with a 30/45 kg/m3 foam gradient to hold peaks under 42 g.

Corner block thickness of an Industrial sensor drop-proof portable case
Density gradient of the foam liner
Acceleration readings after face-by-face drops
Lid pressure drop retested at low temperature
Block-thickness convergence for drop-proof batches
FAQ

1. Corner block thickness of an Industrial sensor drop-proof portable case

Drop energy lands on a corner first, then passes through the block into the liner, and a stiffness mismatch between the two stages amplifies the peak instead of cutting it. The Industrial sensor drop-proof portable case fits one block into each of four corners at 16 mm, so the first part of the impact is absorbed by corner deflection before it reaches the liner. Corners touch the deck first among the six faces, which makes block thickness the lever on that first energy split.

The outer envelope is 480 x 360 x 190 mm, the inner cavity 420 x 300 x 130 mm, wall thickness 3.8 mm, 4.2 kg empty and 8 kg loaded on the drop rig. Sizing fixes the four corner blocks before the cavity depth, and the block seats stay off the lid line so lid foam never bears on a seat.

Thicker blocks do not keep improving the result. A longer rebound raises the reading on the second deck contact.

Block-thickness step	Comparison value	Corner deflection state
Thin step	under 16 mm	corner touches first, deflection short
Nominal step	16 mm	block crushes first, shell loads later
Thick step	over 16 mm	rebound slow, second-contact reading rises

2. Density gradient of the foam liner

The liner uses a 30/45 kg/m3 density gradient, high against the shell and low against the load, so the impact decays in stages after the block. The Industrial sensor drop-proof portable case stacks two foam layers without glue, held by ribs on the cavity wall so the layers do not shift on impact.

Industrial sensor drop-proof portable case line close view, black latch parts and kraft bags in front, workers along the belt, blue bin and fan

The rig drops each of six faces from 1.5 m and records every orientation separately rather than folding them into a mean. The Industrial sensor drop-proof portable case keeps the same foam and ribs through all six, so differences between orientations reflect block thickness and gradient only, with no assembly variable mixed in.

3. Acceleration readings after face-by-face drops

An accelerometer on the inner shell wall takes the peak after six drops from 1.5 m, with the accept line at 42 g; each orientation of the Industrial sensor drop-proof portable case is judged on its own, not on a six-face average. Readings are filed by drop orientation, and two consecutive orientations under 42 g count as a stable stretch.

Drop orientation	Rig setting	Acceleration value
Corner drop	one of 1.5 m / 6 faces	highest peak, under 42 g
Edge drop	one of 1.5 m / 6 faces	middle peak, under 42 g
Face drop	one of 1.5 m / 6 faces	lowest peak, under 42 g

Where the sensor sits matters more than the peak it reports. The peak is the maximum over each full contact, not the initial spike, and the sensor stays at one fixed spot on the inner wall for all six orientations. The Industrial sensor drop-proof portable case lines up contact order, peak and rebound for each orientation on one card, recalled by orientation number at retest. A crossing orientation is not re-dropped to replace the number; the original reading is filed and the crossing is noted. The gap between orientations gets its own column marked against 42 g, with numeric and qualitative notes kept apart rather than merged. After all six faces, corner blocks are checked for cracks and ribs for looseness, and only once the liner has not shifted are the six readings filed.

4. Lid pressure drop retested at low temperature

After soaking at -25 C, the Industrial sensor drop-proof portable case must hold lid pressure drop within 0.25 kPa / 10 min, with one gasket ring at 17 percent compression, two latches at 330 N each, and an IP65 comparison by air-tightness method after 3800 open-close cycles.

Industrial sensor drop-proof portable case black empty case open on a pale tabletop, textured flat foam lid, dark base foam pad, red handle accents

The retest connects the case to a pressure rig, charges it, closes the valve and reads the 10 min decay curve at its end. The case is not charged straight out of the cold box; the mouth is brought back to a measurable state first, then the latches are closed to the same torque.

The cold round moves the seal reading only; the block-thickness convergence value stands.

5. Block-thickness convergence for drop-proof batches

The convergence value is the thinnest step where acceleration stays under 42 g for two consecutive orientations, and anything thinner is excluded. Each drop-proof batch of the Industrial sensor drop-proof portable case is checked corner by corner against this value, and a shell thinner than it stays out of the accepted lot.

Acceleration value	Orientation	Filing method
under 42 g	two consecutive orientations	enters the accepted lot
first reach of 42 g	trace the convergence value	starts the reject review
readings past the line	trend only	kept out of acceptance

With the convergence value fixed, the 17 percent compression of one gasket, two latches at 330 N each, the 3800-cycle record and the IP65 pressure-drop comparison are checked as a set. JUNZHIJIA files corner readings by corner number and sets the batch convergence value from the pressure curves.

Conclusion

The Industrial sensor drop-proof portable case is judged by how its corner blocks meet the foam gradient. A 16 mm block with a 30/45 kg/m3 gradient maps to a peak under 42 g after six-face drops at 1.5 m, and a -25 C round adds a lid pressure drop within 0.25 kPa / 10 min. JUNZHIJIA keeps corner readings and pressure curves on one card and issues a block-thickness convergence value per lot.