Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
  • D21J3/00—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
  • D21J3/00—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
  • D21J3/10—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds of hollow bodies

Definitions

• FIG. 2 illustrates a functional block diagram of one example of the computer shown in FIG. 1.
• FIGs. 4A and 4B illustrate example additive manufacturing apparatus with a recoating mechanism.
• FIGs. 5A through 5E illustrate different views of an example perforated structure or pressing structure manufactured using an additive manufacturing process that can be used in both of the first and second exemplary molding processes described above.
• FIG. 8 is a flowchart of an example process producing a molded product using a perforated structure and a pressing structure.
• Each of the plurality of perforations, including a first perforation 514 provide an opening into the body 518 of the perforated structure 500.
• a material mixture may be distributed onto the first side 510 of the perforated structure 500.
• a pressing structure 516 that is substantially conformal to the first side 510 may apply compress and mold the material mixture according to the shape of the first side 510.
• a surface 509 is provided on the second side 512 of the perforated structure 500 for contact with a heating plane, as discussed in more detail below.
• the support structures 580 may be located between channel openings in the second side 512 and may have a thickness defined by the density of perforations and/or channels that run through the body 518.
• Each of the support structures 580 may be characterized by a first end 581 and a second end 582, wherein the first end 581 may be narrower than the second end 582.
• Such a shape may provide for the previously discussed bottle shaped opening of one or more channels which provides an advantageous path for venting any heated liquid (e.g., steam) displaced from the material mixture out of the second side 512.
• negative space e.g., the first perforation 531, the first channel 532, the second perforation 541, the second channel 542, the channel exit 522, etc.
• positive space e.g., the support structures 580, the first end 581 and second end 582, body material 533, and body 518, of the perforated structure 500 provides support that maintains the integrity of the negative space during the printing process and also functions for transferring heat from the second side 512 to the first side 510.
• the first zone 632 is characterized by a circular area with a rim 636 separating the first zone 632 and the second zone 622.
• the second plurality of channels 630 are defined by a first cross-sectional area that is narrower than a second cross- sectional area, giving the channel an appearance of a bottle with a relatively thinner neck at the first side. While the transition from the first cross sectional area to the second cross sectional area is generally illustrated as a smooth bottleneck-like transition, it should be noted that any suitable transition between the cross section areas is contemplated, including angled transitions (e.g., step or sawtooth transitions).
• the bottle shaped channels are generally illustrated as round or circular, any suitable shape is also contemplated (e.g., triangular and rectangular shaped channels).
• the neck portion of channel the channel 630 is bent to accommodate different contours within the first region wherein a corresponding perforation is located on the contour.
• the rim 636 includes a continuous channel 638 that connects multiple perforations on the rim to other segments of channels within the body of the perforated structure.
• Perforations in the second zone 622 may provide access to multiple segments.
• a first perforation 624 provides access to a first segment 626a of a channel that has a perpendicular or angled connection to a second segment 626b of the channel.
• a perforation in the second zone 622 may provide access to the first segment 626a and the second segment 626b of the channel.
• a channel may comprise multiple branches and segments of different sizes and/or orientations that connect one or more perforations to the multiple segments.
• a channel may be accessed from one or more perforations from one or more zones of the first side.
• properties of heat transfer from the second side to the first side of a perforated structure may be by varying based on the number, size, shape, and/or density of openings.
• heat transfer may be varied across different zones in a perforated structure by varying the same properties of the openings.
• a support structure may provide a means for physical support of a portion of the perforated structure during the AM process.
• the support structure may provide a means for draining excess heat in layers during the AM process.
• a support structure may serve a first role of draining heat from the perforated structure while it is built, and a second role of transferring heat from the second side (e.g., second side 512 of FIGs. 5A-5E) to the first side (e.g., first side 510 of FIGs. 5A-5E) of the perforated structure when it is later used in a molding process.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)

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• 2021
  • 2021-03-26 EP EP21719488.5A patent/EP4127317A1/de active Pending
  • 2021-03-26 WO PCT/US2021/024409 patent/WO2021195527A1/en unknown

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