Produce Packing House Hygiene Equipment: A Guide to the Crate Loop

Blog Post - Industry News | Publish date: 2026-10-20

Introduction

A packing house moves a different load than a meat plant. What arrives from the field is sand, soil, leaf matter and moisture, carried on thousands of crates that go out clean, come back dirty, and must be clean again before the next load of produce touches them.

That cycle, not the building, is what decides the hygiene layout. This article follows the crate loop through five stops - return, wash, dry, personnel entry and the wheeled items around it - with the published parameters for each.

Why Crates Behave Differently Here

In a meat or poultry plant, crate residue is largely protein and fat. In a packing house it is abrasive: grit and sand scratch surfaces and blunt spray impact, so a pre-wash stage that removes loose material before the main wash matters more than raw pressure.

Volume also arrives in bursts. A facility that runs steadily for most of the year can double or triple its daily crate count for a few weeks at harvest, which makes peak, rather than average, the number worth specifying against.

Stop 1 - Crates Returning From the Field

Returned crates carry the heaviest soil load of any container in the building, and they usually arrive stacked in towers that hold grit against the plastic surface. Counting them matters: whatever the line washes must match what the field sends back in a day.

Published systems for this duty are the HE-3600 and HE-4800 crate washing machines, which handle plastic baskets, crates, trays, boxes, pallets and egg trays up to 650 x 350 mm in width and height. The conveyor uses adjustable guide rails, so mixed crate fleets run on the same line.

Stop 2 - The Wash Stage

The two models differ in stages and tanks, which is the decision that matters when specifying.

Construction is SUS304 stainless steel for frame, water tanks, conveyor chains and nozzles, with quick-release nozzles positioned for full coverage and dual-track loop chain conveying to keep crates stable under pressure. Heating is steam, with water temperature published up to 85°C.

The filtration boxes are worth attention in a packing house specifically. Multi-stage screens collect grit before it reaches the pumps, and because grit arrives continuously, cleaning those screens is a daily task rather than a weekly one.

Keeping Soil on the Wet Side

The most useful line in a packing house drawing is not the wall, it is the wet and dry split. Wash room, crate return and boot washing belong on one side; grading, packing and finished pallets on the other. Crates cross the split only through a washer.

The split also settles the drainage question early. Everything on the wet side needs floor falls and a drain route sized for continuous washdown, which is far cheaper to build in than to add once equipment is standing on the slab.

Finally it keeps clean and dirty traffic apart. Field crews returning bins should not pass through the packing hall, which means the wet side usually needs its own door - a detail easier to draw now than to cut into a finished building later.

Stop 3 - Drying Before Stacking

Wet crates that are stacked while damp hold moisture between surfaces overnight, which is how odour and film build up in a crate store. The published answer is an optional air drying tunnel fitted after the wash line.

Where an air drying module is not fitted, planning drainage and airflow around the stacking area becomes part of the wash room layout instead. Either way, drying belongs in the loop, not after it.

Stop 4 - Personnel and Pack Line Entry

Packing halls mix two populations: crews coming in from field work with boots carrying soil, and pack line staff working with product that will not be washed again. Those flows should not use the same door without an hygiene step between them.

Footwear is the heavier half. A boot washer placed on the route from the yard handles soil at the source; units with sanitation dosing cover the disinfection step in the same pass.

Where floor space cannot take a full station, a different instrument fits: the HE-HCDS22 floor-fixed hand disinfection and access control unit occupies a 930 x 370 mm footprint at 1,200 mm height, in 304 stainless at 2.0 mm plate, and unlocks the gate only after disinfection. It cleans hands, not boots - the two steps stay separate.

For hand washing at scale, touchless hand wash and disinfection stations run one to five positions. Ready-to-eat salad and fresh-cut lines usually add an air shower at the high-care boundary, since washed, cut product receives no further treatment. Layering these steps along one route is how the Complete Dressing Room Hygiene Solution is specified for pack houses with mixed field and pack line crews.

Stop 5 - Wheeled Carts, Cull Bins and Field Bins

Crates rarely travel alone. Field harvest carts, wheeled trolleys carrying packed boxes, and bins holding culled or waste product all need washing, and they are usually the items forgotten in the first layout drawing.

Wheeled items are handled by the published 200L meat trolley washer, a dual-chamber machine rated at 60 carts per hour with a rotating spray arm, sized for 200-litre carts of the type used across food plants.

Field bins and waste containers are covered by the tunnel-type bin washing machine, published for 120 L and 240 L bins and larger containers. Keeping this queue out of the crate line protects the throughput of the whole loop.

The Five Stops at a Glance

Three Things Pack Houses Get Wrong

First, specifying for the average day. A line matched to the annual mean runs flat out for six weeks and idles for the rest of the year. Peak crates per wash hour is the number that belongs in the enquiry.

Second, washing everything through the crate line. Trolleys, wheeled carts and cull bins either do not fit the conveyor or slow it down, and their soil load is different again. Giving them their own machine keeps both rates honest.

Third, forgetting that field crews and pack line staff are two populations. A single door serving both, with one hygiene step, is the layout most often flagged during review - and the most expensive to fix once concrete is poured.

All three are specification issues rather than equipment issues, and all three are cheap to solve on a drawing. They get expensive only after floor slabs and services are set.

Sizing for the Peak

Specify against the busiest week of the season, not the annual average. Take the daily crate count at peak, divide by the usable wash hours, and compare that figure with 300-600 or 600-1,000 crates per hour before deciding between the two models.

Then match the surrounding steps to the same number: if the crate line is sized for peak, the Tools Washing Solution approach sizes carts and bins from the same peak day rather than from whatever space is left over.

Where peak work is seasonal, leaving installation space and services for a second line is often cheaper than specifying one machine for a load that arrives eight weeks a year.

FAQ

Q1: Which crate washer fits a medium packing house?

The HE-3600 runs three stages at 300-600 crates per hour in 3,600 x 1,700 x 1,600 mm with two water tanks. The HE-4800 adds a rinsing stage and a third tank, reaching 600-1,000 crates per hour in 4,800 mm of line length. Choose on peak crates per wash hour.

Q2: What crate sizes will the line accept?

Both models accept containers up to 650 mm wide and 350 mm high, with adjustable guide rails on the conveyor, so mixed fleets of baskets, trays, boxes and egg trays can run without change parts.

Q3: Do we need the air drying module?

It depends on what happens to crates after washing. If they are stacked wet overnight, moisture held between surfaces leads to odour and film. The optional air drying tunnel avoids that; otherwise plan drainage and airflow around the stacking area.

Q4: Can one unit handle both crates and wheeled field carts?

Not usually. Crates run through a tunnel washer on a chain conveyor, while 200-litre carts need a chamber machine with a rotating spray arm rated at 60 carts per hour. Specify them as separate items on the same wash room floor.

Q5: We have no room for a full entry station - what are the options?

A slim floor-fixed unit is the usual answer: the HE-HCDS22 needs 930 x 370 mm of floor at 1,200 mm height and combines hand disinfection with gate release. It does not wash boots, so footwear still needs its own step where field crews enter.

About Henger

Henger Manufacturing (Shandong) Machinery Technology Co., Ltd. was founded in 2018 and holds more than 60 invention patents, with an engineering team averaging more than 15 years of experience. The company supplies food hygiene and washing equipment factory-direct, with production carried out under CE and ISO 9001 certified processes, and serves domestic and overseas markets.

Closing Call to Action

Count your crates at peak season, note the widest container you run, and send both with a sketch of the wash room: inquire now, email info3@hengerchina.com, or message WhatsApp +86 188 5430 1052 - our engineering team will return a free layout drawing and quotation.