Soft PVC Profile Sealing Strip Gasket Extrusion Line | PVC Gasket Making Machine | Chenxing

Product Positioning — What This Line Is and What It Solves

The Soft PVC Profile Sealing Strip / Gasket Extrusion Line is a complete profile extrusion line built around a conical twin-screw extruder (model SJSZ65) and dedicated to one of the most demanding profile jobs in the building-materials industry: soft PVC sealing strip and gasket, produced continuously, to dimension, with a clean surface.

A sealing strip is a small product with a big specification. It has to hold its cross-section after it leaves the die, stay flexible enough to compress into a frame groove, and look uniform along a run of hundreds of metres. None of that happens by accident — it comes from the sequence this line is built around: screw feeder → conical twin-screw extruder → T-die → vacuum calibration and cooling table → caterpillar haul-off → cutting machine → stacker.

What the line solves:

• Soft PVC is difficult to size. A soft profile has little rigidity of its own, so it needs vacuum calibration and a controlled cooling length rather than a simple water bath. This line is built with a calibration and cooling table from 4 m to 11.5 m with an independent operation panel for exactly that reason.

• Sealing strip is sold by the metre and judged by the metre. A wavy or dimensionally drifting strip is scrap. The vacuum and water pump set on the calibration table holds the section, and the caterpillar haul-off with abrasion-resistant rubber blocks pulls it at a high and stable speed so the profile does not stretch or wander.

• Clean cutting matters on a small profile. The cutting machine uses a precision cutter for flat, straight cuts at high speed and includes a powerful suction device that collects the waste scraps after cutting, so the cutter stays clear and cleaning is quick.

• Product diversity without buying a new line. The same line runs soft PVC, rigid PVC, soft-hard co-extrusion profile, foamed profile and multi-layer co-extrusion by changing the die head — a flexible platform rather than a single-purpose machine.

In short: the line exists so that a window and door manufacturer, a gasket converter or a profile producer can extrude its own soft PVC sealing strip and gasket in-house, in its own section, at its own width, instead of buying and re-selling an imported strip.

Specifications & Models — What Is Available and How to Choose

The tables below contain the machine specification figures of this line. Two tables are kept separate because they describe different things: the model table describes the size classes of the line, and the attribute table carries the general machine data.

Table A — Model Range and Technical Data

Table B — General Machine Attributes

Reading the tables together. Table A is the selection table: it tells you which width class of line to order for the strip you sell. Table B is the machine attribute data of the line as offered. One point is worth stating plainly: the attribute panel classifies the equipment as a profile extrusion molding machine with a single-screw listing, while the extruder specification and the machine details define a conical twin-screw unit (SJSZ65, and SJZ55/110, SJZ65/132 or SJZ80/156 according to model). Both are shown as given in the source data; the extruder actually supplied with the line is the conical twin-screw model shown in Table A, and the final configuration is confirmed in the quotation.

Compulsory Equipment List

Optional Equipment

How to Choose

• By strip width — YF180 for narrow sealing strip up to 180 mm, YF240 / YF300 for standard window and door gaskets, YF600 for wide profile and multi-track gasket sections

• By extruder — SJZ55/110 (22 kW) for the narrow class, SJZ65/132 (30 kW or 37 kW) for the mid range, SJZ80/156 (55 kW) for the widest profiles

• By utility capacity — cooling water 5 to 10 m³/h and compressed air 0.2 to 0.4 m³/min according to model, so plant utilities can be planned before delivery

• By material — the line is designed around PVC powder and runs soft PVC, rigid PVC, soft-hard co-extrusion, foamed profile and multi-layer co-extrusion

Related equipment for the same plant is described under Profile Extrusion Line, Profile Extrusion Line Solution, Extruder and Auxiliary Machines.

Line Stations in Detail — How the Line Runs

1. Material Charge and Conical Twin-Screw Extruder

The line starts with a screw feeder that meters PVC powder into a conical twin-screw extruder. The extruder is built with:

• Bimetallic screw and barrel for wear life on filled and pigmented PVC compounds

• A high-torque gearbox using NSK / SKF bearings

• A Siemens / WEG original motor with global after-sales support

• World-famous brand electrical components such as Siemens, Schneider and ABB

• An intelligent PLC control system with a human-friendly interface

• Vented (exhaust) barrel and deep screw channel design, with fan screw cooling

• 38CrMoAlA screw material and Omron electric heating

This is the section that determines whether a soft PVC melt arrives at the die in a homogeneous, uniformly plasticised state — which is the precondition for a stable strip dimension.

2. Extrusion Die Head and T-Die

The die head is made of 3Cr13 / 3Cr17 material and is supplied as a complete set together with the calibrator and cooling tank. It applies to soft PVC, rigid PVC, soft-hard co-extrusion profile, foamed profile and multi-layers co-extrusion. Because the die head and calibrator are made for your section, the strip profile — the tongue, the lip, the hollow chamber of a gasket — is formed here, and a thermo-controller for the die head is available as optional equipment for tighter temperature control across a wide die.

3. Calibration and Cooling Table (4 m to 11.5 m)

After the die, the profile enters the calibrating and cooling table, which includes a full set of vacuum and water pumps and is available in lengths from 4 m to 11.5 m. The table has an independent operation panel so it can be adjusted while the line runs. For soft PVC this is the critical station: vacuum holds the soft section against the calibrator while the water cooling sets it, and the length of the table decides how fast the line can run without the strip distorting.

4. Caterpillar Haul-Off Machine

The haul-off is a caterpillar type unit suitable for different profile sizes. The caterpillar blocks are made of abrasion-resistant rubber, which allows a high and stable hauling speed without marking or crushing a soft profile.

5. Saw Cutting Machine

The cutting machine uses a precision cutter to make flat, straight cuts at high speed, and a powerful suction device gathers up the waste scraps after cutting, which makes it easy for the operator to clean the cutter and keeps offcuts out of the product.

6. Stacker or Coiler

The finished strip is collected by a stacker of 6000 mm length or a coiler, depending on whether you sell straight lengths or coiled rolls — the coiler being the usual choice for flexible sealing strip.

Applications — Industries, Equipment and Working Conditions

Why this line is flexible rather than single-purpose. Because both the mould and the extruder are adjustable, the line can be customized to various shapes of plastic profile products according to customer requirements — you buy one line and change the die to change the product, which is what makes it economical for a producer who sells a family of gaskets rather than one section.

Working conditions: the line is installed as a set — feeder, conical twin-screw extruder, die head and calibrator, calibration / cooling table (4–11.5 m), haul-off, saw cutter and stacker — on a level industrial floor, with the table length and run-out length laid out to suit the cut length or coil you produce. Utilities required are cooling water (5 to 10 m³/h by model) and compressed air (0.2 to 0.4 m³/min by model), plus a three-phase power supply matched to the extruder power of the selected model.

Customization Scope — What Can and Cannot Be Changed

What Can Be Customized

• Strip section and die head — the extrusion die head, calibrator and cooling tank are made to your profile drawing

• Product width class — YF180 YF240 YF300 / YF600, covering up to 600 mm maximum product width

• Calibration table length — between 4 m and 11.5 m, matched to your line speed and profile thickness

• Take-off end — stacker with 6000 mm cut length, or coiler for coiled flexible strip

• Extruder model and power — SJZ55/110 (22 kW), SJZ65/132 (30 / 37 kW) or SJZ80/156 (55 kW)

• Material capability — soft PVC, rigid PVC, soft-hard co-extrusion, foamed profile and multi-layer co-extrusion by changing the die set

• Component brands — the electrical cabinet uses ABB, Omron, RKC and Schneider components, with other brands available

• Voltage and market requirements — the electrical design is adapted to your plant and market

• Optional stations — high-speed hot and cold mixer, crusher, industrial water chiller, air compressor and die-head thermo-controller can be added to the supply

• Process support — our engineers help with specifications and process settings for your compound and section

What Is Fixed by the Platform

• The extrusion sequence — feeder, conical twin-screw extruder, die head, vacuum calibration and cooling table, caterpillar haul-off, saw cutter, stacker or coiler

• The vacuum calibration principle — a soft PVC profile requires vacuum sizing and controlled cooling, not a plain water bath

• Screw and barrel construction — bimetallic screw and barrel in 38CrMoAlA

• The caterpillar haul-off with abrasion-resistant rubber blocks

• The cut-off suction device — scrap collection at the cutter is part of the machine design

Equipment that pairs with this line includes the High-Speed Mixing Unit, Crushing Material Suction Machine, Powder Suction Machine, Continuous Powder Suction Machine, SMF Series Grinding Machine, Plastic Agglomerator, Two Stage Recycling Machine, Plastic Pelletizing Line, Automatic Compounding System and the Automatic Compounding System Solution.

Quality & Certification — Tests, Standards and Proof

• Brand-name electrical components throughout — Siemens, Schneider and ABB components, Omron electric heating and an electrical cabinet built with ABB, Omron, RKC and Schneider devices

• Gearbox and bearings — a high-torque gearbox using NSK / SKF bearings, selected for continuous operation on a profile line

• Motor — Siemens / WEG original motor, with global after-sales service coverage for the drive

• Screw and barrel — bimetallic construction with 38CrMoAlA screw material and a deep screw channel, for wear life on PVC powder

• Control system — an intelligent PLC control system with a human-friendly interface, on an automatic, computerized line

• Standard — CE and ISO 9001, with the electrical system built to your market's requirements

• Project and specification experience — we have extensive experience making projects and specifications for clients, backed by a fixed service system, so the line is not delivered as a standalone machine but as a specified process

• Factory capability — in-house technical team and in-house manufacture of the machines, with a production capacity of about 100 lines per month, so an order can be scheduled without long waiting

• Service response — a fixed after-sales system with trained engineers for installation, testing and operator training

Compounding, recycling and ancillary capabilities are described under board / sheet extrusion line, plastic recycling line solution, washing and recycling production line and the advanced material processing EPC project service.

Delivery Terms — MOQ, Lead Time, Packing, Trade Terms

• MOQ — 1 set

• Scope of supply per set — material charge, conical twin-screw extruder, extrusion die head with calibrator and cooling tank, calibrating and cooling table (1 set or several sets), caterpillar haul-off, saw cutting machine, stacker (6000 mm) or coiler, electrical cabinet and one set of spare parts

• Payment terms — 30% prepayment by T/T and 70% balance by T/T, or L/C acceptable

• Lead time — 60 days after receipt of the prepayment

• Packing method — wooden cases / pallets with stretching film, with the machine surfaces protected

• Shipping — sea freight in multiple cases according to the loading plan; freight and estimated delivery time are quoted on request

• Warranty — 18 months for mechanical parts and 12 months for electrical parts

• Installation and training — we send 1 to 2 engineers to your factory to help install and test the machine and to train your workers. This service is chargeable; the rate and duration are agreed in the quotation

• Documentation — the line is supplied with its manual and electrical documentation, and technical files are collected under Downloads; application articles are posted on Company News

Frequently Asked Questions

1. What exactly can this line produce?

Soft PVC sealing strip and gasket are the primary products, and the same line runs soft PVC, rigid PVC, soft-hard co-extrusion profile, foamed profile and multi-layer co-extrusion profile. It also produces building profiles such as PVC window frames, door frames, wall corners, floors, ceilings and partition boards, plus PVC / PE drainage pipes, cable conduits and irrigation pipe in the appropriate die configuration.

2. Which model should I choose for my sealing strip?

Choose by maximum product width: YF180 (up to 180 mm), YF240 (240 mm), YF300 (300 mm), YF600 (600 mm). The extruder scales with the model — SJZ55/110 at 22 kW, SJZ65/132 at 30 / 37 kW, SJZ80/156 at 55 kW.

3. Why is vacuum calibration necessary for soft PVC?

Because a soft profile has little rigidity of its own. The calibrating and cooling table includes a full set of vacuum and water pumps that hold the soft section to dimension while the water cooling sets it. The table is available from 4 m to 11.5 m with an independent operation panel, and its length determines the line speed you can reach without distortion.

4. How does the line avoid stretching or marking the strip?

The caterpillar haul-off machine pulls the profile with abrasion-resistant rubber caterpillar blocks, giving a high and stable hauling speed without crushing or marking a soft section.

5. How is the strip cut, and is cutting clean?

A saw cutting machine with a precision cutter makes flat, straight cuts at high speed, and a powerful suction device collects the waste scraps after cutting so the cutter stays clean and the product stays free of offcuts.

6. Can I change the profile later without buying a new line?

Yes. Both the mould and the extruder are adjustable, so the line can be customized to different shapes of plastic profile products. A new section normally means a new die head, calibrator and cooling tank — the 3Cr13 / 3Cr17 die set is made to your drawing.

7. What are the payment terms and the delivery time?

30% prepayment by T/T with 70% balance by T/T, or L/C. Delivery is 60 days after receipt of the prepayment.

8. What is the warranty?

18 months for mechanical parts and 12 months for electrical parts.

9. Do you provide installation and training?

Yes. We send 1 to 2 engineers to your factory to help install and test the machine and train your workers. This service is chargeable, and the rate is stated in the quotation.

10. What utilities and floor space does the line need?

Cooling water of 5 7 7 10 m³/h and compressed air of 0.2 0.3 0.3 0.4 m³/min according to model, plus three-phase power matched to the extruder power. Floor space must accommodate the extruder line plus the calibration table of 4–11.5 m and the run-out for your cut length or coiler.

11. Which component brands are used, and can they be changed?

Siemens WEG motors, ABB, Omron, RKC and Schneider electrical components, Omron electric heating, NSK SKF gearbox bearings, and a PLC control system with a human-friendly interface. Component brands can be discussed to suit your preference and local service support.

12. How is the machine packed for shipping?

Wooden cases or pallets with stretching film, with surfaces protected for sea transport. For other questions, see the general FAQ list.

Inquiry Entry — What to Send and What You Get Back

Please include the following with your inquiry so that the quotation is accurate on the first reply:

1. Product to be produced — soft PVC sealing strip, gasket, rigid PVC profile, co-extrusion profile or foamed profile

2. Section drawing — the cross-section of the strip or gasket, with dimensions

3. Maximum product width — 180 240 300 / 600 mm class, or your own figure

4. Compound — the PVC formulation you will run (powder), including filler and pigment loading

5. Output target — the kilograms or metres per hour you need, so the extruder can be matched

6. Take-off preference — straight lengths on a 6000 mm stacker, or coiled on a coiler

7. Calibration table length — 4 m to 11.5 m according to line speed and profile thickness

8. Power supply — voltage, frequency and phase at your plant

9. Utilities — available cooling water flow and compressed air capacity

10. Commercial terms — Incoterm, destination port, payment method (T/T or L/C) and required documents

11. Certification requirements — whether CE marking or additional documentation is required for your market

What you get back: a written quotation covering the complete line — material charge, conical twin-screw extruder, extrusion die head with calibrator and cooling tank, calibrating and cooling table, caterpillar haul-off, saw cutting machine with suction unit, stacker or coiler, electrical cabinet and spare parts — with the model, die-head price, lead time, packing plan and payment terms stated, plus our engineers' comments on the strip section design for your application. For a photographic reference of a comparable line layout, you can view more machine details.

Build Your Soft PVC Sealing Strip Line with Chenxing

Send us your gasket or sealing strip section, your target output and your destination port, and we will confirm the model, the extruder and the complete scope of supply in a written quotation. Company background is on About Us; application cases are collected under Application Cases, the catalogue under Products and the full range under Solutions.

Talk to Nicole Today

Nicole — Email: ceo@cxsljx.com | Tel WeChat WhatsApp: +86 159 5118 7228

Send your section drawing and destination port, and we will reply within 24 hours.