Plastic Multi-cavity Milk Crate Mould

Plastic Multi-cavity Milk Crate Mould – high-speed production for dairy crates.
Valve-gated hot runner
BeCu cooling, precision steel (HDPE/PP)
Cycle time: 32–45s
From ZHONGYUE MOULD. OEM/ODM. Request DFM, MOQ, lead time & price list. Send RFQ for a quote today!

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Product Description

Plastic Multi-cavity Milk Crate Mould – High-Speed Dairy Turnover Box Injection Mold by ZHONGYUE MOULD

Milk crates (dairy turnover boxes) carry glass or PET bottles through filling, delivery, washing, and returns. Producing them at scale needs a Plastic Multi-cavity Milk Crate Mould – 2-cavity or more – that lasts long, cycles fast, and makes clean parts. Weld lines and trapped air in the handle area are common problems.

ZHONGYUE MOULD has built hundreds of turnover crate moulds – milk, cola, beer, foldable totes. Our milk crate moulds focus on three things: long tool life, high-speed cycling, and proper venting. Your line runs profitably for millions of shots.

Plastic Crate Mould specifications :

Crate sizes	Crate materials		Crate types
539X289X356 mm 532X354X290 mm 540X360X290 mm 400X300X155 mm 500X300X167 mm 400X300X255 mm 490X300X167 mm 500X360X190 mm	High density polyethylene (HDPE Polypropylene (PP) Recycled plastic		Turnover Box Plastic food crate Plastic vegetable crate Plastic bottle crate Plastic milk crate Folding crate Stackable Storage Crate
Mould Name		Plastic Multi-cavity Milk Crate Mould
Mold Meterial		P20,2738,718H,NAK80,2316,S136,H13,etc
Mold Base		Self-made,LKM,DME,ASSAB
Cavity		Single/multi
Runner		Cold runner and hot runner
Hot Runner Brand		Master, HUSKY,YUDO,etc.
Degsin Software		UG:Aoto CAD and so on
Mold Life		50-100 million Shots/ 5-6 years, Even in 10 years in good maintenance
T1 Time		45-60 days
Plastic Material		PP ABS
Gate Type		Pinpoint Gate, Edge Gate, Sub Gate, Film Gate, Valve Gate, Open Gate, etc.
Mould Surface Treatment		EDM, texture, high gloss polishing
Quality System		ISO9001
HS Code		8480719090
Origin		Huangyan Zhejiang China
Package		Wooden Case
Mould material		Hardness		Mould life
P20		HRC 28-33		>300,000 shots
718		HRC 33-36		>500,000 shots
H13		HRC >43		>800,000 shots
2344		HRC >48		>800,000 shots
S136		HRC 48-52		>1,000,000 shots

Make your next Plastic Crate Mould project brighten!

① How ZHONGYUE Builds a LONG-LIFE Multi-Cavity Crate Mould

Correct Steel Selection for Mold Base & Core/Cavity

For multi-cavity crate molds (especially 2×2 or 4-cavity layouts), we specify pre-hardened mold base steel with HRC ≥ 33 to resist deflection under high clamp forces. Core & cavity options:

P20 (HRC 28–33): Cost-effective for medium runs

718H / 2738 (HRC 33–38): Recommended for multi-cavity production

H13 (quenched & tempered, HRC 44–48) or S136: For 2M+ shot lifespan, especially when running regrind/recycled HDPE

Controlled Heat Treatment & Hardness

Each steel component receives precisely controlled hardening/tempering. Cavity and core hardness is balanced—hard enough for wear resistance but not over-hardened to avoid brittleness and micro-cracking during thermal cycling.

Precision-Machined Guide & Moving Systems

All guide pillars, bushes, angle pins, and slide rails are CNC/grinding machined to ±0.01mm tolerance. Hand-fitting or file-finishing on motion parts is strictly prohibited—this ensures smooth, repeatable multi-million-cycle operation without premature seizure.

Recycled Material Protection (Optional)

If your process uses recycled PP/HDPE (one-time-use or mixed crates) containing small metal fragments or grit:

We design filtered feed zone considerations and recommend extra-hardened cavity inserts (nitride or DLC-coated) to resist abrasion from embedded particles.

Strategic baffle/edge design helps prevent contaminants from embedding into cavity surfaces.

② High-Speed Performance – Engineered for Short Cycle Times

Optimized Filling System – Valve-Gated Hot Runner

Durable milk crates are typically molded from low MFR HDPE (MFI = 4–6 g/10min), which has higher viscosity. Our multi-cavity Milk Crate Moulds employ balanced H-type hot runner manifolds with valve gates (YUDO / Synventive / Anole compatible) to:

Ensure simultaneous, pressure-balanced fill across all cavities

Minimize flow hesitation & reduce weld-line visibility in handle zones

Eliminate cold sprue waste → faster cycles & lower material cost

Superior Cooling with Mold-Max / BeCu Inserts

Cooling dominates 60%+ of the molding cycle. For high-duty crate molds:

Mold-Max (beryllium copper alloy) inserts are placed at thick rib intersections, handle bases, and bottom corners—areas prone to hot spots.

Cooling channels follow Moldflow-optimized layouts with parallel water routing to keep ΔT < 3–5°C between cavities.

Result: Typical cycle time 32–45 seconds for standard milk crates (even faster on stack molds).

For single-use/light-duty crates running tempered steel cores, we still implement full perimeter cooling circuits with baffles/bubblers for optimum heat extraction.

Synchronized Ejection for Faster Cycling

Our multi-cavity crate molds can be equipped with a mechanical early-ejection linkage that begins ejector plate movement during mold opening, or you can command your injection machine to run simultaneous open + eject hydraulic actions. This shaves 1–2 seconds per shot—critical in high-volume dairies.

Four-side actuated slides (hydraulic cylinders + angle lifters) handle undercut handles and side ribs with micron-precise guidance to prevent flash or drag marks.

Machine Recommendation

We recommend a high-speed injection molding machine with screw RPM ≥ 350 and an accumulator-assisted injection unit for rapid high-pressure fill of low-MFI HDPE—essential for multi-cavity crates to avoid short shots and excessive packing time.

③ Handle Area Venting – Critical for Crate Strength

The carry handle is the highest stress zone when a full milk crate is lifted. If air is trapped here → incomplete fusion/weld line → premature crack initiation.

ZHONGYUE'S solution:

Dedicated exhaust grooves (0.01–0.02mm depth) along parting lines at handle extremities

Venting inserts / porous steel vent plugs at last-fill positions in deep handle recesses

Moldflow analysis to verify air trap locations beforesteel cutting

This eliminates visible knit lines in the handle and dramatically reduces in-field handle breakage claims.

④ Stackable & Brand-Customizable Milk Crate Design

Positive Stacking Interlocks: Machined to ±0.1mm so full crates lock securely; empty crates nest tightly (return freight saving ~60%).

Food-Contact Safe Surface: High-polish cavity finish compatible with food-grade HDPE/PP—easy to wash, resists bacterial adhesion.

Custom Branding: Embossed/debossed dairy logos, QR/barcode zones, RFID tag pockets, serial number pits—all integrated into cavity design.

Euro-Standard Compatible: Optional 600×400mm or 400×300mm footprint per your regional dairy logistics.

Why ZHONGYUE MOULD for Your Milk Crate Mold Project?

Proven Multi-Cavity Experience – We have supplied 2-cavity and 4-cavity crate molds (including stack molds) to dairy & beverage processors worldwide, with documented cycle times as low as 32–42 seconds.

Full DFM & Moldflow Service – Before cutting steel we provide fill analysis, cooling simulation, and warpage prediction.

Transparent QC – In-process inspection reports + T0/T1 trial video & sample dimensional report prior to shipment.

Complete Spares & Support – Full set of wearing parts, maintenance manual, and remote troubleshooting.

Start Your Multi-Cavity Milk Crate Mould Today

Whether you need a single-cavity pilot mold or a high-output 4-cavity / stack mold for dairy crates, Zhongyue Mould delivers tooling engineered for longevity, speed, and crate integrity.

How we processing the project?

Plastic Multi-cavity Milk Crate Mould

About us

Driven by the philosophy:

“Quality Makes the Future, Focus Creates Professional”

Zhongyue Mould is a leading company in the plastic injection air conditioner Cover mould industry. Our highly experienced team of engineers and designers have many decades of combined experience in plastic air conditioner Cover mould design and manufacturing. We provide a comprehensive service, specializing in the production of high-quality and high-precision air conditioner Cover moulds. We have also assisted numerous customers in customizing various types of plastic air conditioner Cover moulding lines.

We can also offer comprehensive assistance in the management of your production process. The procurement department will purchase high-quality raw materials, while the technical department will select the appropriate plastic formula. In accordance with the parameters of the plastic air conditioner Cover mould life requirements and market positioning, we will select the most suitable plastic air conditioner Cover parameters, structure, etc. Our extensive production capacity allows us to deliver plastic air conditioner Covers promptly, at competitive prices and with guaranteed quality.

Plastic Multi-cavity Milk Crate Mould