Why fix slot pitch at 12 mm instead of dividing the cavity evenly?

Answer: 395 x 285 x 115 mm measures the shell cavity, and once 14 slots go in, wall thickness and end radii come out of the usable width. Three groups at 12 mm leave a 3.0 mm margin at every rib of the Film focus puller & accessories safety case, while an even split would cut the 25 mm EVA wall too thin.

Is the 1.5 kN applied to the lid or to the divider?

Answer: A platen spreads it evenly over the whole lid, so it is a distributed lid load. The Film focus puller & accessories safety case reads lateral divider-top movement under that condition with a 1 mm acceptance line; a point load would no longer represent the whole liner.

What is the gap between the lid press frame and the slot mouths for?

Answer: It lets the frame gather only the upper length of a slim part while the slot walls carry vertical load. Too little gap sends 1.5 kN into the slot base and too much leaves room to shift, so the Film focus puller & accessories safety case grades the gap by slot depth.

Which items are retested after 4000 open-close cycles?

Answer: The difference between clear mouth width and its initial reading, the 12 mm centre distance, and any collapsed edge or EVA delamination all have to pass together on the Film focus puller & accessories safety case.

How is slot-wall collapse judged after the 1.0 m drop?

Answer: Run a feeler gauge over the mouth gaps, then check with a calliper that the centre distance across 14 slots still holds at 12 mm, and log any collapsed edge or EVA delamination separately.

Film focus puller & accessories safety case

Quick answer: Film focus puller & accessories safety case sets a 12 mm slot pitch so 1.5 kN of lid load keeps divider travel within 1 mm on a 3.0 mm wall.

Vertical slot pitch design of the Film focus puller & accessories safety case
Lid press frame and slot-mouth clearance
Divider deflection under distributed lid load
EVA rebound and slot-wall support
Slot measurement after drop recheck
FAQ

1. Vertical slot pitch design of the Film focus puller & accessories safety case

Slot pitch starts at 12 mm, with 14 slots laid out in three groups inside a 395 x 285 x 115 mm cavity. The Film focus puller & accessories safety case does not divide the cavity evenly: long slots hug the long shell wall while short ones sit near the handle, so an upright slim part is gripped at its mid-section and the closing lid cannot press on a single rib.

12 mm sits between two limits, since widened pitch thins the divider bearing face and tightened pitch cuts the 25 mm EVA wall too thin, and spread across 14 slots it still leaves a 3.0 mm margin at every rib.

Slot group	Centre distance	Wall method
Long-side group	12 mm	Rib and wall as one rib
Handle-side group	12 mm	Clear of the 280 N handle seat
Lid-frame group	12 mm	Chamfered slot mouth
End group	12 mm	Same 25 mm EVA gauge

All four centre distances come from one liner, with no second sample pulled in.

2. Lid press frame and slot-mouth clearance

A lid press frame is a raised ring bearing down over the slot mouths, and the Film focus puller & accessories safety case leaves a specified gap between it and the rib tops rather than seating it hard.

Film focus puller & accessories safety case three white closed boxes stacked on a steel rack, one open beside them holding coiled black cable

The gap is graded by slot depth, wider near the lid and narrower near the base, so 1.5 kN of distributed lid load meets the tallest row of mouths first and spreads row by row. Two latches rated 310 N each pull lid to shell, and only under that clamp line does the IP65 barrier keep its compression reserve.

3. Divider deflection under distributed lid load

A platen spreads 1.5 kN evenly across the whole lid, and the Film focus puller & accessories safety case measures lateral divider-top movement with a 1 mm acceptance line.

A divider that drifts one way at a single slot usually means an EVA density off from the batch or a mouth chamfer cut off-centre; thickening the frame only hides the problem.

Load-bearing area	Load share	Deflection reading
Long-side rib	1.5 kN spread	1 mm max
Handle-side rib	1.5 kN spread	1 mm max
Lower frame edge	1.5 kN spread	Gap not zeroed
Lid diagonal	310 N per latch	No warp

4. EVA rebound and slot-wall support

The 25 mm EVA slot wall is there to rebound after repeated compression, and the Film focus puller & accessories safety case checks that rebound against a 4000-cycle open-close life.

Film focus puller & accessories safety case closed black shell front view, red-grip folded handle, two red-button latches and a round pressure valve

Rebound is logged on one and the same slot across the run: after 4000 cycles the difference between clear mouth width and the initial reading must still sit inside the design band, with no collapsed edge or permanent dent.

Clearance value	Related area	Recheck action
Slot-mouth gap	Lid press frame	Feeler gauge over 14 slots
12 mm centre distance	Slot groups	Retest after 4000 cycles
25 mm slot depth	EVA slot wall	Height before and after rebound
1 mm	Divider top	Residual after 1.5 kN unload

5. Slot measurement after drop recheck

The drop is set at 1.0 m, once on each of the six shell faces, and the recheck accepts only one outcome: slot walls intact and pitch unchanged. The Film focus puller & accessories safety case sets the upright insertion direction off the main impact axis, so the landing energy is taken by the shell and corners first instead of travelling down a rib into the slot base.

Slot measurement uses the same feeler gauge and calliper as the platen rig, so both conditions share one baseline. The gauge walks all 14 slots, logging mouth gap first, then rib-to-rib centre distance, then flagging the largest offset.

Two drop rounds are fixed before the Film focus puller & accessories safety case leaves the factory, empty at 2.9 kg and loaded at 5.5 kg, the first watching slot-wall rebound and the second watching whether the lid frame has been driven into the mouths. A 440 x 330 x 160 mm outer shell may not show lid misalignment in either round.

Conclusion

A 12 mm upright slot pitch, a lid-frame clearance and divider deflection within 1 mm under 1.5 kN of lid load are the three columns on the recheck sheet for the Film focus puller & accessories safety case. Centre distance across 14 slots, 25 mm EVA rebound and no collapsed slots after a 1.0 m drop fill those columns. JUNZHIJIA files these box liners per unit, and Kexin New Materials (Guangdong) Co., Ltd. keeps measurements rather than description on record.