The present disclosure generally relates to improved steam pressing apparatuses, and more particularly to methods, devices, and apparatuses for use in the manufacture of products using steam pressing.
In certain industries, it is necessary to utilize pressing apparatuses such as in the manufacture of plastic, steel, and wood products, among others. These pressing apparatuses are generally employed to compress a working material during the manufacturing process to create a final product. For example, some known pressing apparatuses in the timber industry compress a charge of wood components to form a final wood product. In some cases, steam is used in the pressing process to supply heat for plasticizing the working material (e.g., strands of crushed wood or wood fibers) and for curing any bonding agent applied to the working material. In particular, U.S. Pat. No. 6,344,165, entitled “Manufacture of Reconsolidated Wood Products,” U.S. Pat. No. 7,537,031, entitled “A System and Method for the Manufacture of Reconsolidated or Reconstituted Wood Products,” and U.S. Pat. No. 7,537,669, entitled “Systems and Methods for the Production of Steam-Pressed Long Fiber Reconsolidated Wood Products,” all describe aspects of steam pressing and steam apparatuses in connection with manufacturing reconsolidated wood products.
Such conventional methods and apparatus, however, have significant drawbacks. For example, current pressing systems possess deficiencies in accuracy, timing, and precision during the manufacturing processes that impact the quality of the resultant product. Also, the structure of conventional apparatuses limits the manufacture of products of varying thickness and sizes. Additionally, previous technologies utilize a single entry point to the pressing enclosure where the working product is treated, which reduces production efficiency.
Further, conventional methods and apparatuses are prone to human errors and inaccuracies during the manufacturing process. During that process, apparatuses have traditionally used rudimentary platens which are inappropriate to produce wood products in curved shapes or other non-conventional patterns. Hydraulic cylinders that might move those platens have been generally placed inside of the enclosure where the working material is treated, which causes detrimental heat to the hydraulic oil. Furthermore, the apparatuses used during the manufacturing process are generally small, self-contained units inappropriate to enable scalability and modularity. Additionally, most prior apparatuses are unsuitable for introducing components (e.g., chemicals) to treat the working material at different stages of the manufacturing process.
Therefore, it is an aim of the present disclosure to provide methods and apparatuses that overcome and improve upon existing methods and devices for the forming of steam-pressed reconstituted or reconsolidated products, such as wood and timber products.
Aspects of the present disclosure generally relate to improved steam pressing apparatuses, and more particularly to methods, devices, and apparatuses for use in the manufacture of products using steam pressing.
According to one embodiment, aspects of the present steam pressing apparatus generally comprise a substantially rectangular or square-shaped inner chamber (such as an autoclave) and an outer, generally rectangular or square-shaped structure. In one embodiment, the steam pressing apparatus comprises a hydraulic system used to compress and treat a working material with high efficiency, timing, and precision. In one aspect, the steam pressing apparatus comprises a structure and system that allows modularity and scalability for manufacturing final products of varying dimensions. Further, in another aspect, the apparatus contains sliding doors arranged in such a way as to improve efficiency during the manufacturing process. Additionally, in one aspect, the apparatus comprises a platen with a non-conventional shape for manufacturing wood products of different shapes. Further, the steam pressing apparatus can be designed to respond to computerized instructions relating to the pressure to be applied, steam to be applied, vacuum parameters, timing of the press operation, thickness of the resultant working material, and other informational inputs.
These and other aspects, features, and benefits of the claimed disclosure(s) will become apparent from the following detailed written description of the preferred embodiments and aspects taken in conjunction with the following drawings, although variations and modifications thereto may be effected without departing from the spirit and scope of the novel concepts of the disclosure.
The accompanying drawings illustrate one or more embodiments and/or aspects of the disclosure and, together with the written description, serve to explain the principles of the disclosure. Wherever possible, the same reference numbers are used throughout the drawings to refer to the same or like elements of an embodiment, and wherein:
For the purpose of promoting an understanding of the principles of the present disclosure, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same. It will, nevertheless, be understood that no limitation of the scope of the disclosure is thereby intended; any alterations and further modifications of the described or illustrated embodiments, and any further applications of the principles of the disclosure as illustrated therein are contemplated as would normally occur to one skilled in the art to which the disclosure relates.
Throughout this specification, the term “comprise” or variations such as “comprising” or “comprises” will be understood to imply the inclusion of a stated integer (or component) or group of integers (or components), but not the exclusion of any integer (or component) or group of integers (or components). The singular forms “a”, “an”, and “the” include the plurals unless the context clearly dictates otherwise.
Aspects of the present disclosure generally relate to improved steam pressing apparatuses, and more particularly to methods, devices, and apparatuses for use in the manufacture of products using steam pressing.
According to one embodiment, aspects of the present steam pressing apparatus generally comprise a substantially rectangular or square-shaped inner chamber (such as an autoclave) and an outer, generally rectangular or square-shaped structure. In one embodiment, the steam pressing apparatus comprises a hydraulic system used to compress and treat a working material with high efficiency, timing, and precision. In one aspect, the steam pressing apparatus comprises a structure and system that allows modularity and scalability for manufacturing final products of varying dimensions. Further, in another aspect, the apparatus contains sliding doors arranged in such a way as to improve efficiency during the manufacturing process. Additionally, in one aspect, the apparatus comprises a platen with a non-conventional shape for manufacturing wood products of different shapes. Further, the steam pressing apparatus can be designed to respond to computerized instructions relating to the pressure to be applied, steam to be applied, vacuum parameters, timing of the press operation, thickness of the resultant working material, and other informational inputs.
Referring now to the drawings, in which like numerals illustrate like elements throughout several drawing figures,
In one embodiment, one or more aperture or sealing arrangements 112 are located on the top surface of the autoclave 103 to accommodate driving rods 115. In another embodiment, one or more driving rods 115 are received through aperture or sealing arrangements 112 for axial movement therethrough. A generally rectangular heated top platen 118 is connected to the innermost end of the driving rods 115 for movement in accordance with the corresponding movement of the driving rods 115. When in operation, the autoclave 103 is sealed, and the driving rods 115 are operated to lower the top platen 118 to contact the upper surface of the working material located inside of the autoclave 103. In one aspect, steam is introduced before or at the same time that the working material is compressed into a mat. In another aspect, steam is introduced into the autoclave 103 through steam inlets and conduits before and/or after the charge of wood components has been compressed to the desired thickness. A bonding agent is generally applied to the working material and may contain chemicals for treating the working material (e.g., preservatives, chemical repellants, etc.). Generally, the working material (e.g., reconsolidated wood product) is compressed on top of a heated bottom platen 148.
In one embodiment, a hydraulic system is used to compress the working material with high efficiency, timing, and precision. In one aspect, side plates 106, 109 comprise two identical plates positioned parallel to the sides of the autoclave 103, where each side plate or wall 106, 109 generally rests in proximity to opposite sides of the autoclave 103. As illustrated in
In one aspect illustrated in
In other embodiments, such as those shown in
In one embodiment, the supporting structure 142 consists of a modular system of rigid members around the autoclave 103 attached to each other to provide stability and a point of attachment to the elements of the steam pressing apparatus 100. Generally, the supporting structure 142 comprises vertical members that transfer the mass of the apparatus 100 to the ground, where the members rest on a base plate or a plurality of horizontal members. In another embodiment, additional horizontal members connect between the vertical members, which hold the vertical members in place and provide support for the entire apparatus 100. In one aspect, the supporting structure contains horizontal members that support the driving rods 115 and are received through sealing arrangements 112 in the horizontal members for axial movement therethrough. In one aspect, the autoclave 103 is secured to the supporting structure 142.
In one embodiment, the autoclave contains at least one mechanical system 200 for stopping the vertical movement of the top platen 118. In one aspect illustrated in
In one embodiment, each rigid rod 203 extends vertically parallel to the driving rods 115, and each rod 203 is attached to the top platen 118. Generally, the annular body with the smaller outer diameter in the mechanical stops 209 has an opening 212 that completely penetrates the annular body through the center of its peripheral walls. The rods 203 have one or more openings 215 along their peripheral surface in accordance with the openings in the mechanical stops 209. The mechanical elements 209 can slide along the longitude of the rods; however, the mechanical elements 209 are generally placed so that a rigid body such as a pin or screw can be received through the openings in the mechanical stops 209 and the rods 203 as a means to temporarily restrict the vertical sliding movement of the mechanical stops 209.
In one aspect illustrated in
Still referring to the embodiment illustrated in
In one embodiment illustrated in
In one aspect, the rectangular stops 326 are sized so that the outermost sides of the rectangular stops 326a-326f generally abut the sides of the autoclave 103. In another aspect, the rectangular stops 326a-326f are moved horizontally until the innermost side of each rectangular stop 326a-326f are adjacent to the horizontal dimensions of of the top platen 118. Still referring to
As illustrated in
In one embodiment illustrated in
In one aspect illustrated in
In one embodiment, a modular autoclave and apparatus architecture is employed to provide scalability and flexibility to the steam pressing apparatus 100. In one embodiment, the steam pressing apparatus 100 comprises a modular autoclave 503 constructed in sections such that each section is coupled to a previous section, and all sections are encapsulated by the supporting structure 142. In an exemplary embodiment shown in
In the embodiment shown in
In one embodiment illustrated in
In one aspect, the steam ports can be used for the introduction of one or more chemicals, preservatives, or other treatments to the working material before compressing them into the mat 206. In another aspect, the steam and chemicals are introduced through systems with separate valves. Therefore, this system allows introducing harmful chemicals after the working material is placed in the autoclave 103 isolated from unprotected personnel that may be working with the working material.
In one embodiment, the top platen of the autoclave 103 comprises a non-conventional shape for manufacturing wood products of different shapes. In an exemplary embodiment shown in
In one embodiment, the steam pressing apparatus 100 is designed to respond to computerized instructions relating to the pressure to be applied, steam to be applied, vacuum parameters, timing of the press operation, thickness of the resultant working material, and other informational inputs. In one aspect, the hydraulic system moving the driving rods 115, the side hydraulic cylinders 145, the steam injection system and the vacuum system comprise electronic actuators or similar devices connected to a central computer system, such as a central embedded microprocessor with an external memory or a central microcontroller. In one embodiment, the hydraulic system moving the driving rods 115 and the side hydraulic cylinders 145 operates via hydraulic fluid at a predetermined pressure to move the various components. In one embodiment, the central computer system is a programmable logic controller (PLC) designed for multiple input and output arrangements, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact during the manufacturing process. In one embodiment, the central computer system has digital and analog inputs for communication with the pressure and temperature sensors located inside of the autoclave 103. The sensors can be either digital or analog, and communicate with the embedded computer via an analog-to-digital converter or a digital communication protocol such as I2C or SPI.
In one aspect, the temperature and pressure sensors are connected to an embedded microcontroller or similar computer system, which is connected to a transceiver and an antenna. In one aspect, each sensor is connected to an independent computer system. The embedded microprocessor or microprocessors command the sensors to determine the temperature and pressure in the autoclave 103, and the temperature and pressure values are transmitted wirelessly to a central computer system such as a central embedded microcontroller also connected to a transceiver and an antenna. In one aspect, the sensors and the central computer system communicate using a wireless sensor protocol, where the central computer and the sensors form a wireless sensor network. A system to detect motion comprising one or more devices such as encoders, infrared transceivers, or inertial measurement units is placed inside of the autoclave 103 to track the movement of the top platen 118 and the side plates 106, 109. In one embodiment, the system to detect motion communicates with the central computer system in a similar fashion as the temperature and pressure sensors. In one aspect, the central computer system stores pressure, temperature, timing, size and any other informational data required for the manufacture of different types of wood products. In one aspect, the central computer system is operated to create an open-loop or closed-loop feedback system among the sensors, the motion detection system and the actuators in the steam pressing apparatus 100. The actuators respond and move the parts of the steam pressing apparatus 100 according to the manufacture requirements of the different working materials stored in the memory of the computer system.
As previously described, an exemplary automation system operates the steam pressing apparatus according to a predetermined hydraulic pressure that moves the platens within the steam pressing apparatus 100 and controls the steam according to various predetermined parameters to successfully operate the steam pressing apparatus 100.
As will be generally understood and in one embodiment, at time equals zero or before the steam pressing apparatus 100 begins operating, the steam pressure 803 and the hydraulic pressure 801 are typically at zero. In certain embodiments, the hydraulic pressure and/or the steam pressure are at a particular pressure prior to time equals zero or when the steam pressing apparatus begins operating. Upon receiving an indication at the computerized system to operate the steam pressing apparatus 100, the steam pressure 803 increases to approximately 600 kPa in approximately 60 seconds, as shown at inflection point 805. According to one aspect of the present embodiment, 600 kPa is a set point for initiating operation of the hydraulic system 820. In another aspect, the set point for initiating operation of the hydraulic system 820 is 60 seconds of lapsed time from receiving an indication to operate the steam pressing apparatus 100. As shown at time 820, the hydraulic system initiates operation according to a predetermined parameter and the hydraulic pressure reaches 17 kPa, wherein at 17 kPa the door of the steam pressing apparatus 100 begins closing and the platens begin to press the wood (or other working material) within the steam press apparatus.
As shown in
Upon receiving an indication to operate the steam press apparatus 100, the steam pressure 903 increases to approximately 600 kPa in approximately 60 seconds, as shown at time 905. According to one aspect of the present embodiment, 600 kPa is a set point for initiating operation of the hydraulic system 920. In another aspect, the set point for initiating operation of the hydraulic system 920 is 60 seconds of lapsed time from receiving an indication to operate the steam pressing apparatus 100. As shown at time 920, the hydraulic system initiates operation according to a predetermined parameter and thereafter the hydraulic pressure increases to 17.5 kPa, wherein at 17.5 kPa the doors within the steam pressing apparatus 100 begin closing and the platens begin pressing the wood (or other working material) within the steam press apparatus.
As shown in
The foregoing description of the exemplary embodiments has been presented only for the purposes of illustration and description and is not intended to be exhaustive or to limit the inventions to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. Further, the foregoing times, steam pressures, hydraulic pressures, and other parameters were for exemplary purposes only and were not intended to limit the spirit or the scope of the present disclosure. As will be generally understood by one of ordinary skill in the art, various steam pressures, times, hydraulic pressures, and other parameters may be utilized to press a charge of wood into a resultant product.
In view of the foregoing detailed description of preferred embodiments of the present disclosure, it readily will be understood by those persons skilled in the art that the present disclosure is susceptible to broad utility and application. While various aspects have been described in the context of a preferred embodiment, additional aspects, features, and methodologies of the present disclosure will be readily discernible from the description herein, by those of ordinary skill in the art. Many embodiments and adaptations of the present disclosure other than those herein described, as well as many variations, modifications, and equivalent arrangements and methodologies, will be apparent from or reasonably suggested by the present disclosure and the foregoing description thereof, without departing from the substance or scope of the present disclosure. Furthermore, any sequence(s) and/or temporal order of steps of various processes described and claimed herein are those considered to be the best mode contemplated for carrying out the present disclosure. It should also be understood that, although steps of various processes may be shown and described as being in a preferred sequence or temporal order, the steps of any such processes are not limited to being carried out in any particular sequence or order, absent a specific indication of such to achieve a particular intended result. In most cases, the steps of such processes may be carried out in a variety of different sequences and orders, while still falling within the scope of the present disclosures. In addition, some steps may be carried out simultaneously.
The embodiments were chosen and described in order to explain the principles of the disclosures and their practical application so as to enable others skilled in the art to utilize the disclosures and various embodiments and with various modifications as are suited to the particular use contemplated. Alternative embodiments will become apparent to those skilled in the art to which the present disclosures pertain without departing from their spirit and scope. Accordingly, the scope of the present disclosures is defined by the appended claims rather than the foregoing description and the exemplary embodiments described therein.
This application claims benefit under 35 U.S.C. §119(e) and priority to U.S. Provisional Patent Application No. 61/858,415, filed Jul. 25, 2013 and entitled “Improved Steam Pressing Apparatus”, which is incorporated herein by reference as if set forth herein in its entirety.
Number | Date | Country | |
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61858415 | Jul 2013 | US |