The purpose of this document is to provide quality standards and serve as a guideline to insure proper application of these standards to all adjusting rings manufactured for LADTECH, Inc. LADTECH quality technicians will also adhere to these standards.MATERIALS
The Ladtech adjustment rings are manufactured from 100 percent-recycled plastic. Raw material for processing into moldable plastic flake is selected and purchased based on certification provided and the supplier's reputation for providing consistent containment-free raw materials. The predominant source product for our raw plastic is post-consumer, blow-molded milk jugs and detergent bottles. These products are initially manufactured from High Density Polyethylene as identified and verified by American Engineering Testing, Inc. completed in 1996, to be compatible before integration into the process.INITIAL SORTING
The reclaimed material is first shredded to a uniform size and then goes through a series of wash cycles to clean and float off any labels or foreign materials. The cleaned plastic is then dried, sized to a moldable flake and all fines and dust are removed by aspiration. The selected materials are blended utilizing a 900-pound capacity conical blender. The blended material is then stored in poly bags inside gaylord containers. The melt value of each batch is verified. Each batch is assigned an identification number and identified by date blended and actual melt value. The containers are tagged as to batch number. This information is kept on file for any subsequent tracing needs. This material is now ready to be injection molded. The material batch number is then recorded on the job sheet when production run is made.THE RECYCLING PROCESS
The reclaimed material is first shredded to a uniform size and then goes through a series of wash cycles to clean and float off any labels or foreign materials. The cleaned plastic is then dried, sized to a moldable flake and all fines and dust are removed by aspiration. The reclaimed material is then stored in poly bags inside gaylord containers weighing approximately 750 pounds when filled. These containers are identified and logged by date, source, and reclaim line process parameters (line speed, wash and dry cycle times and water temperature). Any stored gaylord will only contain material of a similar melt flow index and density value. This material is now ready to be injection molded.PROPERTY TESTING OF RECLAIMED PLASTIC TOOLING
All reclaimed material will be tested on a procurement/production batch basis as necessary to verify the following property values:
|Property||Test Method||Acceptable Value|
|Melt Flow Index||ASTM D-4976||4.0 to 10.0 g/10 min.|
|Density||ASTM D-792||.941 to .965 g/cm2|
|Tensile Strength, yield||ASTM D-638||2.0 to 5.0 103lb/in2|
If a blend formula is changed by more than 5% it will be retested to assure compliance with above. When blending is done, processing characteristics necessary to produce a quality part must be maintained. This will be verified by the static compressive testing done on the production parts.TOOLING
All molding will be done on quality production type injection molding tooling. This tooling will be consistent with current manufacturing and safety standards. It will be designed to consistently produce a quality product capable of meeting and exceeding our established quality and performance standards.THE INJECTION MOLDING PROCESS
The LADTECH rings will be injection molded using good manufacturing practices consistent with current technology and the type of injection molding machine being utilized. Product requirements, materials being molded and ultimately, the safety of the operator and any personnel in the immediate vicinity will guide the process.A MASTER SETUP SHEET
Will be established for each part number. This sheet will identify the mold, the injection-molding machine of preference and list all the machine processing parameters that have been established for the run start-up. It will also contain operator instructions pertinent to size gauging, visual inspection requirements and testing requirements, along with any known quality alerts.
A JOB SHEET will be maintained for each production run and become a permanent part of the manufacture's records. This job sheet will be assigned an identification number and will list:
PALLETIZING AND STORAGE
TRUCK LOADING AND SHIPMENTS
1 .250 MAXIMUM allowable deviation from flat (dish or bow)
2 .250 MAXIMUM allowable vertical ribbon effect (convolution) As measured around the outer edge with the part turned top down on a known flat surface
3 .125 MAXIMUM allowable horizontal ribbon effect (bulging between ribs) As measured at the largest outside point and compared to the point where the outer wall intersects the rib sections
1 ± .125 on diameter of length dimensions as shown on part control drawings
2 ± .063 on height dimensions as shown on part drawings for parts to 2" in height
3 ± .125 on height dimension as shown on part drawings for parts over 4" in height
1 Part to be completely filled - on voided areas.
2 No cracks or separations at knit lines.
3 No cracks or tears from part ejection hang-ups.
4 No protrusions from broken ejector pins.
5 Ripples or sags on vertical walls to cover no more than 10% of the surface.
6 Color to be consistent dark gray or black (Derived from the addition of 2% carbon black and any residual color from the recycled materials).
DATE: January 1, 2001 - Replaces any previously issued specifications.
DESPOSITION OF ANY PRODUCT NOT MEETING STANDARDS
Any rings found not meeting quality standards will be reground and reprocessed into quality product. The cause of this quality deviation will be identified and remedied immediately.
PRODUCT PERFORMANCE STANDARDS
The Ladtech HDPE adjustment rings shall meet and exceed the static load requirements of ASSHTO Highway Bridge Specifications HS-25 (21,280 Pounds). The Ladtech HDPE adjustment rings must withstand 1,000,000 plus full load cycles of 10 seconds or less duration. The Ladtech HDPE adjustment rings must perform without failure to a minimum of 150 percent of these load values.
|Melt Index||D 4976||.49||G/10 min.|
|Density||*Estimated||.94 - .96||G/cm2|
|Tensil Strength @yeild||D 638||3,453||PSI|
|Elongation @yeild||D 638||122||%|
|Flexural Modulus||D 790||147,771||PSI|
|Izod Impact Strength||D 256||7.12||Ft-lb/in|
|Hardness (shore D)||D 2240||63.1||--|
|Head Deflection Temp||D 648||174°F||@66 PSI|
|The above data is representative of LADTECH primary-use blend polyethylene. This blend is produced from 100% recycled polyethylene. The predominate source product for the raw plastic is curbside collected, post-consumer, blow molded milk jugs, detergent bottles and injection molded thin-wall containers. The material is shredded, washed, dried, and sized to LADTECH specifications.|
Designs and Specifications
24", 27", 30" 32" & 34" Diameter Rings
24" x 24" and 24" x 36" Catch Basin
THICKNESS/HEIGHT OPTIONS AVAILABLE: (dependent upon diameter as follows)