Description

The sheet venting screw is a key component used in sheet production during extrusion or injection molding. Its design features a special structure (such as a dual venting section) to remove gas and moisture from the raw material, improving sheet quality and simplifying the process. The following are relevant technical points and application information:

Structural Design

Dual-venting screw: Designed specifically for materials such as polycarbonate, it comprises a feed section, compression section, mixing section, and dual venting section. The venting section features deeper screw grooves and a finer flight pitch, effectively removing moisture and eliminating the traditional drying step.

Aspect Ratio: Typically 30-42:1, ensuring adequate melting and venting.

 Applications

 PE sheet. PE sheet. PP sheet. PP sheet. PVC sheets, PVC sheets, etc. (packaging, chemicals, electricity, engineering, machinery)
 PS foam boards, PS boards, ABS boards, etc. (insulation boards, decoration, home appliance shelves, luggage, toys, electronic product consumables)
 PMMA sheets, PC sheets, PETG sheets, etc. (chemicals, culture and education, automotive, shipbuilding, aircraft manufacturing; optical lighting, etc.)
 Large lampshades, explosion-proof lamps, automotive and aircraft window glass
 PA sheets, PEEK sheets, PTFE sheets, PVDF sheets

Specification:

Main Base materials	1.38CrMoAlA (SACM645)	Main Alloy Materials	1. Ni-based alloy/Deloro alloy
	2. SKD-61 (Special Tool Steel)		2. Tungsten carbide/Wolfram carbide
	3. 42CrMo (Ultrahigh StrengthSteel)		3. NiCo-based alloy
	4. DC53 (Cold WorkDie Steel)		4. Fe-based alloy
	5. W6Mo5Cr4V2 (High-SpeedToolSteel)		5. Co-based alloy
Processing Technics	1. Heat treatment	Technical parameters	Nitriding layer depth:0.5-0.8mm
	2. Quenching		Nitrided hardness:900-1000HV
	3. Nitriding treatment		Bimetallic layer depth:3 mm
	4. Bimetallic alloy welding for screw		Bimetallic hardness:57~69HRC
	5. Bimetallic alloy centrifugal casting for barrel		Hard-chrome plating hardness after nitriding:≥950HV
	6. Hard-chrome electroplating		Chrome-plating layer depth:0.03-0.09mm
	7. Linearity of screw:0.015mm		Surface roughness:Ra 0.4

Specification

Screw diameter (mm)	L/D	Screw speed	Output(kg/h) for RPVC	Output(kg/h) for SPVC	Motor power (kw)	Heating zones of barrel	Heating power of barrel	Centrel height
30	15, 20, 25	20-120	2-5	3-8	2.2	3	4, 5	1000
45	15, 20, 25	17-102	6-15	9-22	5.5	3	6, 8	1000
65	15, 20, 25	15-90	15-37	22-55	15	3	12, 16	1000
90	15, 20, 25	12-72	32-64	40-100	24	3, 4	24, 30	1000
120	15, 20, 25	8-48	65-130	84-190	55	4, 5	40, 45	1100
150	15, 20, 25	7-42	90-180	120-280	75	5, 6	60, 72	1100
200	15, 20, 25	5-30	140-280	180-430	100	6, 7	100, 125	1100

Our Benefits
1. Precision Melt Control and Mixing
Injection molding machine screw barrels ensure precise melt control and thorough mixing of additives, colorants, and fillers into the polymer melt. This results in uniform melt quality and enhanced part aesthetics.
2. Extended Service Life and Durability
Our screw barrels are manufactured from high-quality materials, including nitrided steel, bimetallic alloys, and tungsten carbide coatings, to withstand abrasive wear and corrosion. This ensures extended service life and reduced maintenance downtime.
3. Optimized Injection Molding Parameters
By optimizing screw design and material selection, our screw barrels enhance injection molding parameters such as cycle time, shot size consistency, and part dimensional stability. This improves overall production efficiency and reduces scrap rates.
4. Customization Options
We offer customization options to meet specific customer requirements, including screw diameter, length-to-diameter ratio (L/D), flight geometry, material composition, and surface treatments. Our engineering expertise ensures that each injection molding machine screw barrel is optimized for maximum performance and reliability.