General Plastex Inc.
Contact: Dave Mantyla
35 Stuver Pl.
Barberton
Barberton, OH 44203-2417
U.S.
Phone: 800-777-4719, 330-74
Fax: 330-745-6939
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General Plastex designs and manufacturers a range of major injection molding, extrusion, and blow molding components for the plastic and rubber industries. Included are screws and barrels (single and twin), valve, ballchecks, and end caps. Our engineering department custom designs screws to meet production specifications and the plasticizing requirements of specific resins.
NEW SCREWS
General Plastex can manufacture new screws ranging in size from 14mm up to 12" in diameter, 40' in length.
- Materials available - General Plastex can suggest and supply the correct material to withstand today's most abrasive or corrosive resins.
* 4140HT flame hardened and chrome plated
* Nitralloy 135M and nitrided
* 4140HT with hardfacing and chrome plated
* Stainless steel with hardfacing
* Tool steel - D2, H-13, CPM-9V
Note: All General Plastex hardfacing is fully encapsulated to flight tops using a computer controlled plasma transfer arc welding system.
- Engineering - General Plastex can manufacture screws to your specifications, your resin suppliers
recommendations, or let our engineering department custom design a screw to meet your special needs.
- Delivery - New screws can range from 1 to 6 weeks depending on size and design (call: 1-800-777-4719 for available delivery).
SCREW REBUILDING
All screws are rebuilt to meet or exceed O.E.M. specifications. Screws are rebuilt to conform to the
GUARDIAN® REMANUFACTURING SYSTEM, and are warranted the same as our new screws.
- Hardfacing is applied in the same PLASMA transfer arc welding system that is used on our new screws. Each flight top is fully encapsulated with proprietary materials specifically designed for General Plastex, or any commercially available hardfacing such as:
* Colmonoy® #56 - #83
* Stellite #6 - #12 - #1
* Stainless - 420
- "J" wrapped flights - hardfacing material is encapsulated on flight top, and then additional hardfacing is applied to encapsulate the pusher side of the flight to prevent abrasion from undercutting flight top hardfacing which promotes extended screw life.
- A variety of treatments may be applied to the root area of screws to withstand today's most abrasive and corrosive resins.
* Industrial hard-chrome plating
* Nitriding
* Union carbide coating
* Nickel plating
NEW BARRELS
General Plastex can manufacture new barrels ranging in size from 1" up to 12" in diameter, with 40:1 L/Ds
-Barrels are available in the following materials :
Nitralloy 135 - Nitrided
Tool Steels
D-2
CPM-10V
CPMT-440V
Iron Boron (Bimetallic)
Carbide (Bimetallic)
Nickel (Bimetallic)
BARREL RELINING
Our relining service can save up to 40% off the price of a new barrel.
- We offer both partial and full length relining in your choice of bimetallic or tool steel.
- All relined barrels carry a same as new guarantee.
COMPONENTS
Quality components such as non-return valves and end caps are manufactured to our most demanding standards.
ENGINEERING
Let the General become part of your management team. We can offer the right designs to improve your products.
- Screw design
- Upsizing
- Downsizing
- Hardfacing selections
- Valve Design
General Plastex is a privately held company that has served the polymer industry since 1985. Our main focus is manufacturing and re-manufacturing both screws and barrels for the plastic and rubber industries. Its commitment to quality, delivery and service has led the company to expand and offer non-return valves and end caps to complement its product line. In addition, General Plastex also services the pet food and consumer food market.
In January 1995, General Plastex moved into its new 53,000 square foot facility. This move was facilitated because of the need to house an expanding work force which grew from a modest number of 5 to over 50 at this time. The additional 40,000 square feet also allowed General Plastex to add a new state-of-the-art computer-controlled screw mill and plasma welding machines.
This dedication to expansion has allowed General Plastex to exceed its initial sales forecasts by 750%.
Announcing the Guardian Screw Remanufacturing system -
available only from General Plastex! This unique, 23-step program
allows us to remanufacture feed and injection screws to meet
or exceed OEM specifications - and at a savings of up to 40%
less than the cost of a new screw!
The 23-step Guardian System...High Quality at a Sensible Price!
1. Drive shank is fully inspected for torque cracks, then it is rekeyed or resplined.
2. Shank bearing is rebuilt and hardsurfaced.
3. Root channels are rebuilt to OEM specifications (if required).
4. Critical feed flight geometry is maintained.
5. Screw flights are encapsulated with the best hardsurfacing material for your particular application.
6. Exact L/D is maintained or corrected to OEM specifications
7. Entire screw is acid-dipped to reveal cracks and other defects in the metal.
8. Feed length is checked to assure the proper feed and compression ratio.
9. Transitional root taper is checked for proper material feed.
10. Minimum flight width is maintained for maximum productions and proper shear rate.
11. Cracks are removed before hardsurfacing.
12. The entire flight section is ground to virgin steel.
13. A corrosion-resistant layer is applied between the virgin steel and the hardsurfacing material.
14. Critical metering of the root diameter is maintained for compression, melt and production.
15. All flights are electronically checked for RC hardness.
16. Proper hardsurfacing materials are selected based on the application of the screw.
17. Feed transition and metering areas of the screw are reinspected.
18. In thermoset applications, the wind-down tip is rebuilt and precision ground to OEM specifications.
19. Flight OAL is maintained to assure proper melt flow.
20. OAL of screw is held to close tolerances to prevent damage to valve or end cap.
21. The screw is straightened at four different critical times to prevent barrel wear.
22. The screw is plated with chrome or another selected coating and is polished to a high micro finish.
23. Finally, the entire screw is inspected to Guardian Spec I-SB2001 to meet or exceed OEM specifications.
PLASMA TRANSFER ARC HARDSURFACING
PTA hardsurfacing offers many advantages over Manual TIG hardsurfacing:
1. Less dilution of the base material into the weld.
2. Higher hardness and better corrosion resistance of the hardsurfacing material.
3. Better control of welding parameters provides improved consistency of the weld deposit throughout the screw.
