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Thermoforming Design Guidelines

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Thermoforming Design Guidelines Associated Thermoforming THERMOFORMING DESIGN Inc. GUIDELINES Vacuum and pressure thermoforming for the purpose of this discussion is to be consid- ered a single sheet of “heavy gauge” (>.060” thickness) thermoplastic, which is held in a rectangular or square platen, heated in a oven to an optimum forming temperature, then formed over a single sided tool. This tool is usually aluminum for production runs and would include vacuum holes and enclosure to facilitate pulling the part down on the tool. Pressure may be applied to the side opposite the tool, possibly along with a plug assist to enhance certain features for cosmetic, close tolerance parts. Rough layout of the part should be square or rectangular to minimize scrap. ATI also has the capability to produce twin sheet parts, but those design considerations will be addressed elsewhere. As thermoforming is a done with a single sided tool, the critical surface of the part should always face the tool as this is the “controlled” surface with the best tolerances and surface treatment. Features formed on the controlled side of the part will telegraph through to the back side and vise versa. General guidelines for part design are as follows, although ATI is often capable of bending these rules in certain circumstances. 1) DRAFT: Draft is the degree of taper of a vertical sidewall to facilitate removal of the part from the tool. Always provide the maximum draft possible for any given vertical feature, as this can help minimize de-molding problems and may help reduce part cost. 1.5-2º of draft is a minimum on a female feature, and a deep texture will require more. For male features, minimums are in the 4-6º range. The deeper the feature or rougher the surface texture, the more draft is required. • It is possible, given certain geometries, to have 0º draft on female vertical walls. 2) RADII: The greater the radii the better from the perspective of material distribution (and therefore cost). Tight radii in the range of .015” can be attained in a female pressure-formed part. Over a male feature, the thickness of the material plus .030-.060” is desirable. Related to radii is the intersection of adjoining surfaces. 3) DRAW RATIO: The draw ratio expresses the relationship between the beginning surface area of the unformed sheet which covers the opening of a feature, and the ending surface area of the interior of the feature once formed. A 3 to 1 ratio is generally a maximum draw ratio. Avoid multiple tall features too close to each other. Generally, the distance between two features, like ribs or cooling vents, needs to be no less than 2x the material thickness. A caution about corners: Avoid intersections of walls that are >90º, as it can be very difficult to get material to flow into that feature. 4) UNDER CUTS: Undercuts are features protruding from or into the tool surface, which would prevent removal of the part from the tool. Such features are possible with the use of movable “cores-pulls” in the tool, which are often automatic. These cores are used to form the feature, then are retracted to allow the part to be removed. Under cuts are generally not to exceed 5/8” in depth. 5) REFERENCE POINTS: Reference points should be designed into a part, which allows a measurement from a controlled (molded) surface or point to a critical feature of the part, such as drilled hole centers, cutouts, or other features. 6) RIBS AND BOSSES: Ribs may be formed into the part according to the parameters above. Ribs are used to support a flat surface. Ribs or other reinforcement may also be machined independently and glued in at added cost. Internal bosses may also be independently machined and glued in, roughly at a cost of $1 per boss. 7) TEXTURE: Texture may be incorporated into a given part either by using a textured raw material or by texturing the face of the tool. Texturing is of course an added expense and requires increased draft. More than one texture can be done on a part, as can areas of no texture. 8) JOINING LINES: Two parts may be joined together such as a front and back case. The preferred joint is a lap joint, which would form an under cut in one of the parts adding expense to the tool. The joint should also require a witness line of about .060” to accommodate tolerance variation of the joint. 9) TRIM, HOLES, CUT-OUTS, VENTS: Trimming dimensions need to be referenced from the molded side of the part. Vents, or openings may be molded in by the use of a male feature, and then machined off from the back to give a finished outside edge where hardware or electronics are mounted from the inside to show through to the exterior. 10) HARDWARE: All manner of hardware can be attached in secondary operations. And oftentimes hardware can be “insert-molded” into the part. 11) STRUCTURAL PARTS: Twin-sheet thermoforming (link) creates structural parts that are three-dimensional, light and can be quite rigid. There are many things that can be done with twin-sheet that can’t be done in the traditional single-sheet process: • Parts can be foam-filled for additional stiffness • Parts can have vertical parting lines which essentially make them “invisible” • The two sheets can be different resins, colors, or thicknesses One of the limitations is the twin-sheet process is that certain deep-draw features cannot be attained as there is no opportunity to mechanically “help” move the material into those features as there is in the traditional single-sheet process. 12) TOLERANCES: Tolerances are a variable, which ranges from the thickness and surface of the extruded stock, through tooling, trim and precision routing. Always provide the greatest tolerance possible to reduce costs and lead-time. • Formed details are +/-.030” up to 12”, plus .002” per inch ; • Drilled hole centers are +/-.015” up to 12”, plus .001” per inch above 12”; Please note, exceptions to the above • Trim dimensions are+/-.030” up to 12” plus .002” per inch above 12” guidelines can always be entertained. MATERIALS Almost any thermoplastic can be thermoformed. There is a great many resins and combinations of resins (alloys or capped sheet) available to meet almost any application’s requirements, and more are being developed every year. The table below lists the major categories of resins that ATI has extensive experience with. “Key properties” is a brief description of the more salient characteristics, but each resin type is quite diverse in the range of properties and properties that can be “tuned” to a purpose. The “Notes” section below indicate some of the range of modified properties available for the different resin families. MATERIAL KEY PROPERTIES TYPICAL APPLICATIONS APPLICATIONS AT ATI ABS (1,2,3,4,5,6) Stiff, tough, general purpose Instrument enclosures, Vending displays, ice dispensers, functioning parts medical enclosures Acrylic Very clear, excellent weatherability, brittle Skylights, windows Light diffuser Styrene (3,5) Stiff, low impact, inexpensive Food containers, Large Disposable medical trays point-of-purchase displays Polyethylene (2,5, 7) Somewhat flexible, chemical resistance, Bottles, truck-bed liners Bowling pin dispenser, SUV trunk tough even at low temperatures, inexpensive Polycarbonate (1) Very tough, good heat resistance, good weatherability Bullet-proof windows, Hot-dog cooker covers water bottles Polypropylene (7) Very tough, very flexible, chemical resistance, “Living hinge” Surgical helmet, automotive roof supports low heat distortion PETG (5) Clear, tough, notch sensitive Mannequins, chemical trays TPO Very tough, excellent cold resistance, low thermal Automotive skirts and fenders Bowling pin setter housing (thermo-plastic olefin) expansion, excellent UV resistance TPU Extremely tough, flexible, outstanding cold impact Ski boots shells Cushioning products (thermo-plastic urethane) Noryl Flame resistant, god chemical resistant, good Electrical enclosures Medical enclosure electrical properties PVC Flexible, chemical resistant, flame resistant Medical packaging NOTES: 3) May be modified to offer higher impact resistance 6) May be modified to satisfy FDA/NSF food grade requirements 1) May be modified or alloyed to offer flame resistance and/or low smoke toxicity 4) May be modified to resist high heat distortion 7) May be modified to have higher stiffness 2) May be modified or alloyed to offer good Ultra Violet resistance 5) May be modified to offer good conductivity and/or static dissipation address 765 2nd Street, Berthoud, Colorado 80513 phone 970-532-2000 toll free 800-466-MOLD fax 970-532-2942 web site www.ThermoformS.com email [email protected].
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