Plastic PP DN1000 Manhole Extension Mould

Plastic Plastic PP DN1000 Manhole Extension Mould – Inspection Chamber L=1000mm Injection Mold by ZHONGYUE MOULD

In modern municipal drainage systems, Plastic Inspection Chambers replace traditional brick-and-concrete manholes with lightweight, corrosion-resistant, and easy-to-install modular components. A complete chamber consists of:

Base (Bottom / Benched Base) – with inlet/outlet sockets

Extension Shaft(s) / Riser Rings– adjust chamber depth to ground level

Cone / Reduction Section

Cover Frame & Grate

The Plastic PP DN1000 Manhole Extension Mould (L=1000mm) is the precision injection tool that produces a smooth-wall or vertically-ribbed cylindrical riser with internal Ø1000mm, matching socket/spigot joints with EPDM rubber seal grooves at top & bottom. At ZHONGYUE MOULD (Huangyan, Taizhou, China), we specialize in manhole chamber mold systems — including base, shaft (250/500/750/1000mm heights), cone, and cover frame — engineered for PP material (shrinkage 1.6–1.8%), deep-cavity cooling, and split-cavity (haunched) demolding.

Plastic Manhole Mould specifications :

Typical Technical Specifications – DN1000 Manhole Extension Shaft Mould (L=1000mm)

Make your next Plastic Manhole Mould project brighten!

What is a PP DN1000 Manhole Extension Shaft (L=1000mm)?

Rib Design: Optional external vertical reinforcing ribs for added buckling resistance in deep burial.

Standards: Conforms to EN 13598-2 / DIN 19534 / GB/T 19472 (depending on market).

How ZHONGYUE Engineers a High-Quality Manhole Shaft Mould

① Split Cavity (Haunched / Two-Half Mold) for Safe Demolding

A Ø1000mm × L1000mm deep-draw thin-wall barrel cannot be stripped from a solid core without excessive draft → requires split cavity design (哈夫模 / split mold):

Cavity splits into 2 or 3 segments (halves / petals) operated by hydraulic cylinders or angled pins for lateral opening.

Core (inner mandrel) is stationary or retractable; product released by opening split cavity.

Precision-machined parting line with minimal flash; mating surfaces ground & fitted.

Draft angle on inner core typically 1°–1.5° (slightly more on outer split cavity) for smooth release.

② Deep-Cavity Cooling – Inner Core & Outer Shell Separation

Cooling dominates cycle time (typically 90–150 sec for L=1000mm shafts):

Inner Core: Deep-drilled baffle + bubbler tube reaching full depth → uniform cooling from inside out.

Outer Split Cavity: Series or parallel water lines spaced 20–25mm from molding surface; BeCu (Beryllium Copper) inserts at thick rib/shaft ends.

Independent temperature control for core vs cavity to manage differential shrink and prevent ovality.

③ PP Shrinkage Compensation & Seal Groove Accuracy

Mold designed with PP shrinkage factor 1.6–1.8% isotropically compensated, verified by Moldflow if needed.

Upper & lower socket seal grooves (for Ø-ring EPDM gasket) machined to ±0.05mm tolerance to ensure watertight joint with adjacent shaft/base/cone.

Internal surface can be smooth (Ra ≤ 0.8μm) or with light texture if ribbed.

④ Steel Selection – Balance Wear & Cost

⑤ Gating & Venting

Typically side fan gate or multiple overlap gates at one end (bottom or top depending on orientation) to fill from socket end upward, minimizing air entrapment in deep cavity.

Parting line vents along barrel length to evacuate air — critical in deep thin-wall PP molding to avoid burn marks.

Cold runner standard; hot nozzle optional for high-volume dedicated lines.

Typical Applications

Municipal Storm & Sanitary Sewers: Adjustable-depth inspection chambers for residential/commercial developments

Roadside Drainage: With heavy-duty cover adapters (D400/F900 rated)

Rainwater Harvesting / Soakaways: As riser to bring access to surface

Modular System: Stackable with push-fit rubber ring joints — can combine multiple 250/500/1000mm shafts to achieve any burial depth

Compatible with EN 13598-2, DIN 19534, GB/T 19472 standard chambers when produced with certified PP.

Why ZHONGYUE MOULD for Your Manhole Shaft Mold?

Complete Chamber System Capability – We make molds for Base + Shaft (multiple heights) + Cone + Cover Frame — one-stop for chamber system suppliers.

Deep-Draw Cooling Expertise – Baffled core bubbler + zoned cavity cooling to minimize warp and cycle time on L=1000mm shafts.

Precision Split-Cavity Machining – Ground parting faces, minimal flash, hydraulic interlock safety.

Full QC Package – CMM inspection, steel certs, T0 trial video & sample dimensional report before shipment.

Spare Parts & Support – Extra seals, wear plates, heater bands (if hot nozzle), remote troubleshooting.

Start Your Manhole Extension Shaft Mould Project

Whether you need a DN1000 PP Manhole Shaft Mould L=1000mm (or 500/750mm variants), or a full inspection chamber mold set (base + shafts + cone + cover), our engineering team is ready.

How we processing the project?

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.