Penetrating hot air device for reducing the penetration of ambient air

Abstract

A through-air apparatus for drying or bonding a paper, tissue, or nonwoven web is provided. The apparatus includes a web support structure configured to move and a first component having at least one sealing element proximate to the web support structure, wherein the sealing element is configured to reduce infiltration of ambient air into the through-air apparatus. The apparatus also includes at least one channel configured to direct air to the sealing element to reduce infiltration of ambient air into the through-air apparatus. A method of operating a through-air apparatus for drying or bonding a paper, tissue, or nonwoven web is also provided. The method includes directing air to a sealing element to reduce infiltration of ambient air into the through-air apparatus.

Description

Technical Field

[0001] This invention relates in part to a through-air apparatus and method of use for manufacturing web products, which reduces the permeation of ambient air into the through-air apparatus. Background Technology

[0002] "Penetrating hot air technology" is a term used to describe systems and methods that allow air to flow through paper, tissue paper, or nonwoven fabric webs for the purpose of drying or bonding fibers or filaments. Examples include drying nonwoven products (such as tea bags and specialty paper); drying and curing of glass fiber mats, filter paper, and resin-treated nonwovens; thermal bonding and drying of spunbond nonwovens; drying of hydroentangled (steam-dried) webs; thermal bonding of geotextiles with or without bicomponent fibers; drying and curing of lining-grade products; and thermal bonding of absorbent cores with fusible bonding fibers. Drying tissue paper is another application of penetrating hot air technology.

[0003] Systems and methods related to through-flow hot air drying are typically referred to using the acronym "TAD". Systems and methods related to through-flow hot air bonding are typically referred to using the acronym "TAB".

[0004] Penetration-type hot air equipment generally comprises a rigid, breathable web support structure. The web is placed on the web support structure, and as the web support structure moves, a fan can blow air through the walls of the web support structure to process the web. The web support structure typically has multiple openings to allow air to pass through the structure. Summary of the Invention

[0005] In a first aspect, a through-flow hot air apparatus is provided for drying or bonding webs of paper, tissue paper, or nonwoven fabric. The apparatus includes: a web support structure configured to move; and a first component having at least one sealing element adjacent to the web support structure, wherein the at least one sealing element is configured to reduce the permeation of ambient air into the through-flow hot air apparatus. The apparatus also includes at least one channel configured to direct air to the at least one sealing element to further reduce the permeation of ambient air into the through-flow hot air apparatus.

[0006] In another aspect, a method of operating a through-flow hot air apparatus is provided for drying or bonding webs of paper, tissue paper, or nonwoven fabric. The method includes placing the web on a portion of a web support structure and moving the web support structure such that the web moves with it. The method also includes providing a first component having at least one sealing element adjacent to the web support structure, wherein the at least one sealing element on the first component is configured to reduce the permeation of ambient air into the through-flow hot air apparatus. The method further includes directing air to the at least one sealing element to reduce the permeation of ambient air into the through-flow hot air apparatus.

[0007] In another aspect, a through-flow hot air apparatus is provided for drying or bonding webs of paper, tissue paper, or nonwoven fabric. The apparatus includes a rotating web-bearing structure comprising a bearing surface having multiple openings to allow air passage, and a web wrap angle defining an angularly active and angularly inactive region of the web-bearing structure, creating active and inactive airflow regions for the through-flow hot air apparatus. The apparatus also includes a stationary structure relative to which the rotating web-bearing structure rotates, the stationary structure including one or more sealing elements configured to reduce the infiltration of ambient air into the active region of the through-flow hot air apparatus compared to a structure without said one or more sealing elements and otherwise identical. The apparatus also includes one or more channels for supplying recirculated air or other heated airflow to said one or more sealing elements, thereby further reducing the infiltration of ambient air into the active region of the through-flow hot air apparatus. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of a conventional through-type hot air equipment system;

[0009] Figure 2 This is a schematic diagram of a through-type hot air device system having recirculation of air from inside the device system, according to one embodiment.

[0010] Figure 3 This is a schematic diagram of a through-type hot air device system having recirculation of air from inside the device system, according to another embodiment.

[0011] Figure 4 This is a schematic diagram of a through-type hot air device system having recirculation of air from inside the device system, according to another embodiment.

[0012] Figure 5This is a schematic diagram of a penetrating hot air device system having air recirculation from an external air source, according to yet another embodiment.

[0013] Figure 6 This is a cross-sectional view of a through-type hot air device according to one embodiment;

[0014] Figure 7 yes Figure 6 The detailed sectional view of the circled area shown in the image;

[0015] Figure 8 This is a cross-sectional view of a through-type hot air device according to another embodiment;

[0016] Figure 9 yes Figure 8 The detailed sectional view of the circled area shown in the image;

[0017] Figure 10 This is a cross-sectional view of a through-type hot air device including a plenum according to another embodiment;

[0018] Figure 11 This is a cross-sectional side view of a through-type hot air device including an exhaust duct sealing element according to another embodiment;

[0019] Figure 12 yes Figure 11 The detailed sectional view of the circled area shown in the image;

[0020] Figure 13 This is a cross-sectional side view of a through-type hot air device including a radial exhaust duct sealing element according to another embodiment;

[0021] Figure 14 This is a cross-sectional view of a through-flow hot air device according to another embodiment, including an outward flow channel arrangement;

[0022] Figure 15 This is a cross-sectional view of a through-flow hot air device according to another embodiment, including an inwardly arranged flow channel; and

[0023] Figure 16 This is a cross-sectional view of a through-type hot air device including a flatbed configuration according to another embodiment. Detailed Implementation

[0024] This disclosure relates to a through-flow hot air apparatus configured for manufacturing various products, such as paper, tissue paper, and / or nonwoven webs. Those skilled in the art will recognize that, depending on the environment in which the apparatus is used, the through-flow hot air apparatus may be configured as a through-flow hot air dryer (TAD) and / or a through-flow hot air bonder (TAB). Those skilled in the art will also recognize that the through-flow hot air apparatus can be used to manufacture various web products that are wound in their final finished form. It should also be recognized that the products may not be wound and / or may be cut into final finished products. Furthermore, those skilled in the art will recognize that the through-flow hot air apparatus can be configured for manufacturing a variety of products, including but not limited to various films, fabrics, or other web types of materials, and that the apparatus can be used in a variety of processes that may include mass transfer, heat transfer, material displacement, web handling, and quality monitoring, including but not limited to drying, heat bonding, sheet transfer, water extraction, web tensioning, and porosity measurement.

[0025] As described in more detail below, a penetrating hot air device includes a rigid, permeable web support structure configured to move relative to another part of the device. The web is placed on the web support structure, and as the web moves, a fan can blow air through the walls of the web support structure to process the web. The web support structure typically has multiple openings to allow air to pass through the structure. As discussed in more detail below... Figures 6 to 15 As shown, in some embodiments, the web support structure is a through-type hot air roller configured to rotate about a first axis. This will be discussed in more detail below. Figure 16 As shown in the diagram, in another embodiment, the web support structure is a flat strip configured to translate along a horizontal or inclined plane. It should be understood that the configuration described below can be included in various types of through-flow hot air equipment configurations employing web support structures configured for rotational and / or translational movement, and this disclosure is not limited in this respect.

[0026] In one embodiment, the web (i.e., the product) is typically in sheet form and is partially wound around the cylindrical housing of the through-flow hot air device (i.e., the through-flow hot air roller). The web is wound around a portion of the roller (ranging from, for example, 90° to 360°, and typically between 180° and 300°). The cylindrical wall of the through-flow hot air roller typically has multiple openings configured to allow air to pass through. A fan / blower is used to circulate air through the product, and the through-flow hot air roller is typically positioned within a hood to optimize airflow characteristics. As the product travels through the working area of ​​the device with the rotating housing, the fan / blower circulates air through the walls of the cylindrical housing to process the product. A heater may be provided so that heated air circulates through the through-flow hot air roller.

[0027] Figure 1 A schematic diagram of a conventional through-flow hot air device system is shown. As shown, the through-flow hot air device 100 includes a through-flow hot air roller 120 configured to rotate within a shroud 130. The system includes a main fan 140 that directs system air (also referred to as process air) through a duct 170 and into the shroud 130, then draws the air into the through-flow hot air roller 120. As shown, an air heater 150 may also be coupled to the duct 170 to direct heated air into the through-flow hot air roller 120. The system may also include an exhaust fan 160 to extract air through the duct 170 to the outside of the device 100 for venting into the atmosphere. Figure 1 As shown, there is a closed loop for system air, that is, system air flows from the main fan 140 into the shroud 130 through the duct 170, passes through the penetrating hot air roller 120, and is discharged from the exhaust pipe through the duct 170.

[0028] The through-flow hot air device 100 is typically a very large machine. For example, the through-flow hot air roller 120 may have a length between 1 foot and 30 feet and a diameter between 1 foot and 22 feet. The cylindrical walls of the roller 120 may be formed of an open, rigid structure to allow air to flow through it. In one embodiment, the through-flow hot air roller 120 may be a HONEYCOMB from Valmet, Inc.

[0029] As mentioned above, the penetrating hot air device 100 has an effective airflow area configured to receive system air for processing the web. Figure 1 As shown, the area of ​​airflow in this operation is partially defined by the configuration of the penetrating hot air roller 120 for receiving the web product. Also as... Figure 1 As shown, the through-flow hot air device also has a non-functional airflow area, which is partially defined by the portion of the through-flow hot air roller 120 not configured to receive the web product. As explained in more detail below, these functional and non-functional areas can vary depending on how the web is wound around the through-flow hot air roller 120.

[0030] The inventor recognized that... Figure 1 The problems associated with the conventional through-flow hot air device 100 shown are as follows. In particular, the inventors recognized that there is undesirable infiltration of ambient air into the through-flow hot air device 100. As described in more detail below, there is typically a space or gap between the web support structure and adjacent components of the through-flow hot air device 100 to allow movement of the web support structure. This gap is generally between about 0.06 inches and 0.375 inches. Figure 1In the specific embodiment shown, the web support structure is a rotating through-flow hot air roller 120. One or more sealing elements (discussed below) may be provided on these adjacent components to reduce the infiltration of ambient air. Nevertheless, the infiltration of ambient air into the through-flow hot air device can still occur at these locations. The inventors recognize that there are currently limitations on how small the sealing gap can be set due to various factors such as the size, width, operating vacuum, rotational speed, and load of the through-flow hot air roller. As described in more detail below, aspects of this disclosure are intended to reduce and control such infiltration of ambient air into the through-flow hot air device.

[0031] As described in more detail below, aspects of this disclosure include directing air to at least one sealing element on one or more components of a through-flow hot air device to reduce the infiltration of ambient air into the through-flow hot air device. As discussed below, the air directed to the sealing element can originate from a variety of locations, including but not limited to recirculated system air from another part of the through-flow hot air device system. In one embodiment, the air originates from the exhaust line of the through-flow hot air device. Other air sources are also conceivable and discussed below. For example, heated air sources and unheated air sources not specifically located within the through-flow hot air device system can also be used. As described below, at least one channel is provided in the through-flow hot air device to direct this air to the sealing element.

[0032] The inventors have considered various advantages of this disclosure. First, the concepts of this disclosure can be used to increase the energy efficiency of a permeable hot air device by recirculating exhaust air, minimizing internal heat loss, and / or reducing the infiltration of ambient air into the permeable hot air device. Second, the concepts discussed herein can be used to help regulate and / or control the system air humidity level within a permeable hot air device. Third, compared to conventional permeable hot air devices, the concepts of this disclosure allow for a larger gap or space between the sealing element and the web support structure.

[0033] Details of various embodiments are described below, but the one conceived by the inventors will be described first. Figures 2 to 5 The diagram shows a high-level overview of various penetrating hot air devices.

[0034] The inventors have developed a novel permeable hot air device configuration that reduces the infiltration of ambient air into the permeable hot air device. As described in more detail below, the device includes one or more channels for delivering air to one or more sealing elements. Figures 2 to 5 Various schematic diagrams of penetrating hot air equipment systems are shown, illustrating various air sources conceived by this disclosure. Figures 6 to 16 (Described below) Various channel configurations within a penetrating hot air device are shown for guiding air to sealing elements.

[0035] Figure 2 A schematic diagram of one embodiment of a penetration-type hot air device system is shown, wherein heated air is delivered to at least one sealing element via a booster fan 204. Figure 1 Similarly, the through-type hot air device 200 includes a through-type hot air roller 120 configured to rotate within a shroud 130. As shown, in one embodiment, the web support structure is the through-type hot air roller 120. This will be further explained in more detail below. Figure 16 As shown, in another embodiment, a non-rotational configuration is envisioned, and the web-bearing structure may include a flat strip configured for translational movement. As illustrated, a main fan 140 directs system air through duct 170 into the permeable hot air device 200, and an air heater 150 can be used to direct heated air into the permeable hot air device 200. Furthermore, an exhaust fan 160 can be used to extract air outside the device 200.

[0036] In particular, unlike Figure 1 The conventional equipment shown Figure 2 The permeable hot air device 200 shown also includes an additional duct 202, which includes an auxiliary fan 204. As described in more detail below, the duct 202 and the auxiliary fan 204 are configured to direct air to at least one sealing element in the permeable hot air device 200. Details regarding how the air is directed to the sealing element are provided below. Figures 6 to 16 This is shown in the text and described in detail below. For example... Figure 2 As shown, duct 202 and booster fan 204 are specifically used to guide exhaust air from duct 170 back to at least one sealing element in the permeable hot air device 200 to reduce the permeation of ambient air into the permeable hot air device 200.

[0037] Figure 3 A schematic system diagram of another embodiment of the penetrating hot air device 300 is shown. (In addition to alternatives) Figure 2 The duct 202 and booster fan 204 shown in the image are in... Figure 3 The embodiment shown illustrates the exterior of duct 302 (which is used to recirculate heated exhaust air to a sealing element in the permeable hot air device 300), Figure 3 and Figure 2 The same applies. As mentioned above, details regarding how air is specifically directed to the sealing element are in... Figures 6 to 16 As shown in the diagram and described in more detail below, in this embodiment, the duct 302 is positioned downstream of the exhaust fan 160, such that the exhaust fan 160 can be used to direct air to the sealing element. Therefore, in this specific embodiment, a separate booster fan 204 is not required.

[0038] This disclosure also envisions a configuration where the air directed to the sealing element does not specifically originate from an exhaust line. For example, as Figure 4 As shown in the schematic system diagram, in one embodiment, this disclosure contemplates a configuration in which air directed to a sealing element is delivered via a main fan 140. As illustrated, a duct 402 branching from a conventional duct 170 is provided between the main fan 140 and the air heater 150. As described in more detail below, duct 402 is configured to direct air to one or more sealing elements on the permeable hot air device 400. Also discussed in more detail below, duct 402 may include one or more flow control features (such as dampers 404) to control the amount of air flowing to the sealing element, enabling control or regulation of the humidity level of the system air.

[0039] Figure 5 A schematic diagram of another through-flow hot air device system according to yet another embodiment is shown. In this embodiment, air is delivered to a sealing element via a heated air source 510 located outside the system air of the through-flow hot air device system. Unheated air sources are also contemplated, and this disclosure is not limited thereto. As shown, a duct 502 is configured to guide heated air from the heated air source 510 to the sealing element of the through-flow hot air device 500. For example, in one embodiment, the air source 510 may include preheated ambient air, turbine exhaust air, Yankee hot air system exhaust air, vacuum pump exhaust air, other heated airflows in a paper machine or factory environment, or any other hot air source. Other embodiments may include unheated air sources, and this disclosure is not limited thereto.

[0040] like Figures 2 to 5 As shown, this disclosure envisions various configurations in which air is obtained from different sources (both sources located within the permeable hot air device system and external sources located outside the system air of the permeable hot air device), and then the air is directed into the permeable hot air device and directed to at least one sealing element.

[0041] Now go to Figures 6 to 16 Now, we will describe in more detail how air is specifically directed to one or more sealing elements in the permeable hot air equipment.

[0042] Figure 6A through-flow hot air device 600 is shown, comprising a through-flow hot air roller 610 (i.e., a rotating web support structure) configured to rotate about a first axis 602. As shown, a web 620 is wound around the roller 610. The through-flow hot air roller 610 has a support surface 612 with multiple openings to allow air passage. The device 600 may also include a roller 614 that assists in transferring the web 620 onto and off the roller. The web winding angle θ defines the angularly active and inactive areas of the web support structure. Figure 6 As shown, roller 614 is positioned such that the web winding angle θ in the non-operating area is approximately 110°, and therefore the web angle in the operating area is approximately 250°. Those skilled in the art will recognize that these angles can vary, and this disclosure is not limited in this respect.

[0043] Those skilled in the art will also recognize that these non-active and active areas of the web-bearing structure create corresponding active and non-active airflow areas for the through-flow hot air device. As mentioned above, the active airflow area of ​​the through-flow hot air device is the portion configured to receive system air for processing the web. The active airflow area of ​​the through-flow hot air device can be defined as including the area of ​​the web wound around the roller 610, and the area configured to pass through the duct 170 (see...). Figure 1 The area surrounding the receiving system air. Conversely, the non-operating airflow area of ​​a penetrating hot air device can be defined as the area excluding the web wound around the roller 610.

[0044] The penetrating hot air roller 610 can rotate relative to another component, such as the stationary structure of the penetrating hot air device. As described in more detail below, the stationary structure may include various components, such as, but not limited to, internal partitions, non-functional area baffles, exhaust ducts, air chambers, and / or hoods, and radial or transverse stationary skirts of the machine. Those skilled in the art will recognize that the stationary structure and its associated sealing elements can be made of various materials, such as, but not limited to, Teflon, metals, and plastics. As described in more detail below, in one embodiment, the sealing element is the end point and / or edge of the stationary structure.

[0045] Figures 6 to 7 The specific embodiments disclosed herein illustrate a configuration of a stationary structure including a non-functional area baffle 630. As shown, the non-functional baffle 630 is coupled to a partition 650, and the baffle 630 is configured to cover the non-functional area of ​​the penetrating hot air roller 610 to prevent the infiltration of ambient air. As shown, the non-functional baffle 630 may be a curved member that matches the profile of the penetrating hot air roller 610. In another embodiment, the baffle may be a flat member.

[0046] exist Figures 6 to 7 In the illustrated embodiment, the baffle 630 includes at least one sealing element. In this specific exemplary embodiment, it has a first sealing element 632 located at one end of the non-operating area and a second sealing element 634 located at the other end of the non-operating area. Those skilled in the art will recognize that, relative to a structure without sealing elements but otherwise identical, the first sealing element 632 and the second sealing element 634 are configured to reduce the infiltration of ambient air into the operating area of ​​the penetrating hot air device. Furthermore, additional sealing elements (not shown) may be provided around the circumference of the baffle 630. Figures 6 to 7 As shown, in one embodiment, sealing elements 632 and 634 are the end points and / or edges of the baffle 630. In another embodiment, the sealing elements may include other parts of the stationary structure, and it is also contemplated that the sealing elements are not integrally formed with the stationary structure. Figure 6 As shown, and as Figure 7 As shown in the detailed view, one or more channels 640 are provided for delivering recirculated air or other airflow to at least one sealing element 632, 634, thereby further reducing the infiltration of ambient air into the area of ​​action of the through-flow hot air device 600. As shown, in one embodiment, the channel 640 is inside the through-flow hot air roller 610. As described below, in another embodiment, at least a portion of the channel 640 configured to guide air to one or more sealing elements may be located outside the through-flow hot air roller 610.

[0047] like Figures 6 to 7 As shown, at least one channel 640 extends radially outward from the first axis 602 toward the outer periphery of the through-type hot air roller 610. As shown, the first channel 640 extends outward toward the first sealing element 632, and the second channel 640 extends outward toward the second sealing element 634. In another embodiment, a continuous channel 640 may be provided. In one embodiment, at least a portion of the channel 640 may extend along the first axis 602 (i.e., the axis of rotation of the through-type hot air roller 610). It is conceivable that exhaust air or some other system air from the through-type hot air device circulates along axis 602 through the channel, then exits the channel radially and reaches the sealing elements 632, 634. Figures 6 to 7As indicated by the arrow path, air can be guided radially outward toward the rotating through-type hot air roller 610. As shown, some air can also be guided substantially parallel to the inner surface of the baffle 630 and can be configured to distribute air evenly along the perimeter of the baffle 630. The channel 640 can be designed with dampers or other known flow control devices to allow for uniform distribution of recirculated air to the edges of the baffle sealing elements 632, 634.

[0048] This disclosure also envisions configurations, for example, having a third and a fourth sealing element and one or more additional channels 640 extending into additional sealing elements, thereby further reducing the infiltration of ambient air into the area of ​​action of the penetrating hot air device. It should be understood that, in one embodiment, the baffle 630 is rectangular in shape and has a sealing element associated with each of its four sides. One or more channels 640 may be configured to deliver recirculated air or other airflow to the sealing elements.

[0049] Figures 8 to 9 Another embodiment of the penetrating hot air device is shown in the figure. Figures 8 to 9 Some of the components in the middle are related to the discussion above. Figures 6 to 7 The components in the embodiments shown are similar and therefore have the same reference numerals. Figures 8 to 9 A through-flow hot air device 700 is shown, comprising a through-flow hot air roller 610 (i.e., a rotating web support structure) configured to rotate about a first axis 602. As shown, a web 620 is wound around the roller 610. The through-flow hot air roller 610 has a support surface 612 with multiple openings to allow air to pass through. The device 700 may also include a roller 614 that assists in transferring the web 620 onto and off the roller 610. The through-flow hot air roller 610 rotates relative to a stationary structure of the through-flow hot air device. Figures 8 to 9 The specific embodiments disclosed herein illustrate a configuration of a static structure including an internal partition 750. Note that in this embodiment, there may or may not be as described above. Figures 6 to 7 The non-functional area blocking plate 630 shown.

[0050] exist Figures 8 to 9In the illustrated embodiment, the partition 750 includes at least a first partition sealing element 732 and a second partition sealing element 734. In the illustrative embodiment, the first sealing element 732 is positioned at one end of the non-operating area, while the second sealing element is positioned at the other end of the non-operating area. Those skilled in the art will recognize that, relative to a partition structure that is otherwise identical but without sealing elements, the first sealing element 732 and the second sealing element 734 are configured to reduce the infiltration of ambient air into the operating area of ​​the permeable hot air device. Figure 8 As shown, and as Figure 9 As shown in the detailed view, one or more channels 740 are provided for delivering recirculated air or other airflow to at least one sealing element 732, 734, thereby further reducing the infiltration of ambient air into the effective area of ​​the penetrating hot air device 700. As shown, in one embodiment, the channel 740 is located inside the penetrating hot air roller 610. Figures 8 to 9 As shown, at least one channel 740 extends radially outward from the first axis 602 toward the outer periphery of the through-type hot air roller 610. As shown, the first channel 740 extends outward toward the first sealing element 732, and the second channel 740 extends outward toward the second sealing element 734. In one embodiment, at least a portion of the channel 740 may extend along the first axis 602 (i.e., the axis of rotation of the through-type hot air roller 610). It is envisioned that exhaust air or some other system air from the through-type hot air device may circulate along axis 602 through the channel and then circulate radially outward to reach the sealing elements 732 and 734.

[0051] like Figures 8 to 9 As shown, sealing elements 732, 734 may include at least one of a perforated plate, channel, nozzle, or slot, configured to create an air curtain to reduce the permeation of ambient air into the penetrating hot air device 700. In this embodiment, sealing elements 732, 734 are configured to create an air curtain extending radially outward toward the rotating penetrating hot air roller 610. Figures 8 to 9 In this context, these features on the sealing elements 732, 734 are indicated by four parallel arrows extending outward from the sealing elements 732, 734 toward the rotating through-type hot air roller 610. In other words, the sealing elements 732, 734 may include channel sections 742 (i.e., channel portions) in gas communication with one or more channels 740 for conveying recirculated air or other airflows. Figures 8 to 9As shown, the channel section 742 may have a rectangular cross-section and a perforated surface 744 substantially parallel to the adjacent bearing surface 612 of the penetrating hot air roller 610 (i.e., the rotating web bearing structure). Air is conveyed through these perforations 746 to further reduce the infiltration of ambient air into the working area of ​​the penetrating hot air device 700. The perforations 746 are intended to broadly include perforated plates, channels, nozzles, slots, and / or other configurations known to those skilled in the art for creating an air curtain at the sealing elements 732, 734. It should be understood that the perforations 746 may be profiled in the machine direction or transverse direction to accommodate varying pressure or airflow requirements at various points along the sealing area. In other words, the perforations 746 may be oriented differently to achieve the desired effect. Furthermore, it should be understood that this disclosure contemplates one or more sealing elements 732, 734 positioned along either side of the periphery of the partition 750.

[0052] Turn now Figure 10 The accompanying drawing shows a cross-sectional view of a through-flow hot air device 800 according to another embodiment, which includes an air chamber 810 located outside a through-flow hot air roller 610. As mentioned above, the through-flow hot air roller 610 (i.e., the rotating web-bearing structure) is configured to rotate about its central axis. As shown, a web 620 is wound around the roller 610, and the device 800 also includes a roller 614 that assists in transferring the web 620 onto and off the roller 610. Figure 10 In the specific embodiment shown, the penetrating hot air roller 610 rotates relative to a stationary structure of the penetrating hot air device 800, which includes an air chamber 810 positioned to cover the non-operating area of ​​the device 800. For simplicity, in Figure 10 Additional components located inside the through-flow hot air roller 610 of the through-flow hot air device 800 are not shown. As indicated by multiple arrows, the air chamber includes one or more channels 840 for conveying recirculated air or other airflow to one or more air chamber sealing elements 832. In one embodiment, the sealed air chamber 810 has a perforated plate 844, one surface of which faces the exterior of the web support structure (i.e., the through-flow hot air roller 610) occupying the non-operating area of ​​the through-flow hot air device 800 in a spaced-apart relationship. The sealed air chamber 810 is connected to one or more channels (such as...) for conveying recirculated air or other airflow. Figures 6 to 8The channels 640, 740 shown are gas-connected, thereby delivering air through the perforated plate 844 to the non-operating area to further reduce the infiltration of ambient air into the operating area of ​​the penetrating hot air device 800. As mentioned above, the term perforated plate 844 is intended to broadly include perforated plates, channels, nozzles, slots, and / or other configurations known to those skilled in the art to create an air curtain at the sealing element 832. It should be understood that the perforations may be oriented in different configurations relative to the adjacent rotating penetrating hot air roller 610 to provide different airflow conditions along the sealing area.

[0053] Figures 11 to 12 An embodiment of a through-flow hot air device 900 is shown, which includes a plurality of exhaust duct sealing elements 932, 934. In this embodiment, a through-flow hot air roller 610 rotates relative to one or more exhaust ducts 910. The exhaust ducts 910 are typically located at one end of the device 900 and configured such that system air inside the through-flow hot air roller 610 is drawn out of the device 900 and then into a duct or conduit 170. Figure 11 A cross-sectional side view of a through-flow hot air device 900 is shown, wherein two exhaust duct sealing elements 932, 934 are positioned at one end of the device 900. In one embodiment, the exhaust duct sealing elements 932, 934 may have a circular shape (i.e., a donut shape). In another embodiment, these exhaust duct sealing elements 932, 934 may have different geometries and may include, for example, curved portions and / or straight portions. As shown, the same exhaust duct sealing elements 932, 934 may be positioned at the other end of the device 900. As mentioned above, there may be a space / gap between the rotating through-flow hot air roller 610 and the exhaust duct 910. The exhaust duct sealing elements 932, 934 are configured to reduce the permeation of ambient air into the through-flow hot air device 900.

[0054] For simplicity, the additional components located inside the through-flow hot air roller 610 of the through-flow hot air device 900 are not shown. Exhaust duct sealing elements 932, 934 may be in gas communication with one or more channels for delivering air (from any of the aforementioned sources) to the exhaust duct sealing elements 932, 934 to reduce the permeation of ambient air into the through-flow hot air device 900. As indicated by the arrows, one or more channels exist for delivering recirculated air or other airflow to one or more exhaust duct sealing elements 932, 934. It should be recognized that, in Figures 11 to 12 In the embodiment shown, sealing elements 932 and 934 are located outside roller 610, and these channels may also be located outside roller 610. This is consistent with... Figures 6 to 8The channels 640 and 740 shown are located inside the roller and form a contrast.

[0055] It should be understood that the aforementioned perforations can also be provided on the exhaust duct sealing elements 932, 934 to further reduce the infiltration of ambient air into the penetrating hot air device 900. As mentioned above, the term "perforation" is intended to broadly include perforated plates, channels, nozzles, slots, and / or other configurations known to those skilled in the art to create an air curtain at the sealing elements 932, 934.

[0056] Figure 13 This is a cross-sectional side view of a through-type hot air device 1000 according to yet another embodiment of the present disclosure, the through-type hot air device including a plurality of radial exhaust duct sealing elements 932, 934. In this embodiment, a through-type hot air roller 610 rotates relative to one or more exhaust ducts 910. Figure 11 The embodiment shown differs from the one in which the end cap of the through-type hot air roller 610 is closed. As shown, the exhaust duct 910 is typically located at one end of the device 1000 and is configured such that system air passes through the web support structure (as indicated by the arrows along the length of the through-type hot air roller 610), is drawn from the through-type hot air roller 610 and enters the exhaust duct 910 (as indicated by the arrows adjacent to the exhaust duct 910), and then enters the duct or conduit 170 (as shown). Figures 1 to 5 (as shown in the image). Figure 13 Two exhaust duct sealing elements 932, 934 are shown positioned at one end of device 1000. In one embodiment, the radial exhaust duct sealing elements 932, 934 may have a circular shape (i.e., a donut shape), but other shapes and geometries are also contemplated as discussed above. As mentioned above, there may be space / gap between the rotating through-flow hot air roller 610 and the exhaust duct 910. The radial exhaust duct sealing elements 932, 934 are configured to reduce the permeation of ambient air into the through-flow hot air device 1000.

[0057] For simplicity, the additional components located inside the through-flow hot air roller 610 of the through-flow hot air device 1000 are not shown. Radial exhaust duct sealing elements 932, 934 may be in gas communication with one or more channels for delivering air (from any of the aforementioned sources) to the radial exhaust duct sealing elements 932, 934 to reduce the permeation of ambient air into the through-flow hot air device 1000. As indicated by the arrows inside the sealing elements 932, 934, there are one or more channels for delivering recirculated air or other airflow to one or more radial exhaust duct sealing elements 932, 934. It should be recognized that, in Figure 13In the embodiment shown, sealing elements 932, 934 are located outside roller 610, and these channels may also be located outside roller 610.

[0058] This disclosure also envisions embodiments of a through-type hot air device including a flow-through roller. Figure 14 This is a cross-sectional view of a through-type hot air device 1100 according to one embodiment, including an outward flow channel arrangement. Figure 15 This is a cross-sectional view of a through-flow hot air device 1200 according to another embodiment, including an inwardly arranged flow channel.

[0059] Figure 14 The outward flow channel arrangement shown includes a through-flow hot air device 1100, which includes a through-flow hot air roller 610, an exhaust chamber 1150, and a shroud 1130 extending around the through-flow hot air roller 610 and the web 620 in an angular wrap. As discussed above, the through-flow hot air roller 610 (i.e., the rotating web support structure) is configured to rotate about its central axis. Figure 10 Similar to the disclosed embodiments, the web 620 is wound around the roller 610, and the device 1100 also includes a roller 614 that assists in transferring the web 620 onto and off the roller 610. Figure 14 In this specific embodiment shown, the through-type hot air roller 610 rotates relative to another structure of the through-type hot air device 1100 (which includes a stationary exhaust chamber 1150, a rotating roller 614, and a shroud 1130). For simplicity, the additional components of the through-type hot air device 1100 located inside the through-type hot air roller 610 are not shown. Figure 14 It is displayed in the middle.

[0060] exist Figure 14 The path of the system air is shown by an open arrow. As shown, the system air extends downward through the air chamber 1150 positioned between the two rollers 614 and enters the penetrating hot air roller 610. Once inside the penetrating hot air roller 610, the system air flows outward through the web support structure of the penetrating hot air roller 610.

[0061] As discussed above, this disclosure aims to include at least one channel configured to direct air to at least one sealing element in a permeable hot air device to reduce the infiltration of ambient air into the permeable hot air device. In this specific embodiment, the permeable hot air device 1100 includes an exhaust chamber sealing element 1132 positioned adjacent to roller 614 at the upper portion of air chamber 1150. The paths of these channels directing air to at least one sealing element are as follows: Figure 14The term is indicated by a closed arrow. For example, as shown, there may be a channel inside the exhaust chamber sealing element 1132 to reduce the permeation of ambient air into the penetration hot air device 1100. As indicated by the arrow, these channels may be angled toward the roller 614. In one embodiment, these channels extend laterally in the machine. Figure 14 As shown, there may also be a channel inside the exhaust chamber 1150, and there may also be a channel inside the shroud 1130 positioned around the periphery of the penetrating hot air roller 610.

[0062] As indicated by multiple closed arrows, exhaust chamber 1150 and shroud 1130 include one or more channels for conveying recirculated air or other airflow to one or more chamber sealing elements 1132, 1134. As discussed above, exhaust chamber 1150 and shroud 1130 are in gas communication with one or more channels for conveying recirculated air or other airflow, thereby allowing air to be conveyed through the channels to reduce the infiltration of ambient air into the penetration hot air device 1100. It should be recognized that, in Figure 14 In the embodiment shown, the air chamber sealing elements 1132 and 1134 are located outside the roller 610, and these channels may also be located outside the roller 610.

[0063] Figure 15 The inward flow channel arrangement shown includes a penetrating hot air device 1200, which includes components relative to those described above. Figure 14 The components shown in the embodiment are basically the same as those marked. The difference is that the airflow direction in the system is opposite. In particular, in Figure 15 The path of the system air is indicated by open arrows. As shown, the system air extends through the penetrating hot air roller 610 and rises into the exhaust chamber 1150 positioned between the rollers 614. In some aspects, Figure 15 The embodiments shown are similar to Figure 10 The air chamber configuration shown is similar.

[0064] exist Figure 15 As indicated by multiple closed arrows, exhaust chamber 1150 includes one or more channels for conveying recirculated air or other airflow to one or more exhaust chamber sealing elements 1132, 1134. Exhaust chamber 1150 is in gas communication with one or more channels for conveying recirculated air or other airflow, thereby allowing air to be conveyed through the channels to reduce the infiltration of ambient air into the penetration hot air device 1200. It should be recognized that, in Figure 15 In the embodiment shown, sealing elements 1132 and 1134 are located outside roller 610, and these channels may also be located outside roller 610. This is consistent with... Figures 6 to 8The channels 640 and 740 shown are located inside the roller and form a contrast.

[0065] Turn now Figure 16 This illustrates one embodiment of a through-flow hot air device, which includes a web support structure configured for translational movement. In particular, Figure 16 This is a cross-sectional view of one embodiment of a through-flow hot air device 1300, which includes a flat plate configuration that can be configured as a through-flow hot air dryer (TAD) or a through-flow hot air adhesive (TAB). The general principle is the same as the embodiments described above, except that... Figures 6 to 15 The configuration of the web support structure involved is different from that of a rotating, penetrating hot air roller. Figure 16 The web support structure disclosed in the embodiments is a flat strip 1310. In one embodiment, the flat strip 1310 is a mesh / sieve-like material, which may be made of metal or synthetic strands. Figure 16 In the embodiment shown, the flat belt 1310 is configured to translate along a horizontal plane. In another embodiment, it is envisioned that the flat belt 1310 be configured to translate along an inclined plane. Web materials are placed on the flat belt 1310, and the flat belt 1310 moves similarly to a conveyor or transport belt. Figure 16 As shown, components adjacent to the permeable hot air device 1300, such as the upper air chamber 1330, include at least one sealing element 1332 configured to reduce the permeation of ambient air into the permeable hot air device 1300. Furthermore, as by Figure 16 As indicated by the arrow, at least one channel is provided, which is configured to guide air to at least one sealing element 1332 to reduce the permeation of ambient air into the penetration hot air device 1300.

[0066] It should also be recognized that although many of the aforementioned through-flow hot air equipment components with sealing elements can be discussed as stationary relative to the moving web support structure, the above concept also applies to through-flow hot air equipment components with sealing elements that can be movable (configured for rotational and / or translational movement), and this disclosure is not limited in this respect. There is a possibility of ambient air infiltration into a through-flow hot air equipment with two movable parts; therefore, this disclosure aims to include sealing elements in both the stationary and movable parts.

[0067] Furthermore, as discussed above, components of a penetrating hot air device with sealing elements can be positioned within the web support structure (such as...). Figures 6 to 9As shown, within the penetrating hot air roller 610, the penetrating hot air equipment components having baffle sealing elements 632, 634 and partition sealing elements 732, 734) and / or having sealing elements can be positioned outside the web support structure (such as... Figures 10 to 12 As shown, the outside of the through-type hot air roller 610 has an air chamber sealing element 832 and an exhaust pipe sealing element 932, 934.

[0068] Furthermore, those skilled in the art will recognize that, in one embodiment, the above-described through-flow hot air device can be used on a through-flow hot air dryer, while in another embodiment, the above-described through-flow hot air device can be used on a through-flow hot air bonding machine, and this disclosure is not limited thereto.

[0069] Various aspects of this disclosure relate to a method of operating a through-flow hot air device. The method includes placing a web on a portion of a web support structure and moving the web support structure such that the web moves with the web support structure. The method also includes providing a first component having at least one sealing element adjacent to the web support structure, wherein the at least one sealing element on the first component is configured to reduce the permeation of ambient air into the through-flow hot air device and to direct air to the at least one sealing element to reduce the permeation of ambient air into the through-flow hot air device. In one embodiment, directing the air includes directing heated air to the at least one sealing element to reduce the permeation of ambient air into the through-flow hot air device. In another embodiment, a non-heated airflow may be directed to the at least one sealing element.

[0070] In one embodiment, the web support structure is a through-type hot air roller, and the method includes wrapping the web around an angular portion of the through-type hot air roller to create an active airflow area and a non-active airflow area of ​​the through-type hot air device, and rotating the through-type hot air roller about a first axis, thereby causing the web to rotate with the through-type hot air roller. In another embodiment, the web support structure is a flat belt configured to translate along a horizontal or inclined plane.

[0071] In one embodiment, the first component includes an exhaust duct and an exhaust duct sealing element, and air is directed to the exhaust duct sealing element to reduce the permeation of ambient air into the penetration hot air device.

[0072] In another embodiment, the first component includes an internal partition and a non-operating area baffle, and air is directed to the baffle sealing element to reduce the infiltration of ambient air into the permeable hot air device.

[0073] In yet another embodiment, the first component includes an air chamber, and air is guided through the air chamber to at least one sealing element to reduce the permeation of ambient air into the permeable hot air device.

[0074] It should be understood that this disclosure also envisions the presence of second and third components with additional sealing elements in the permeable hot air device, wherein air is directed to these additional sealing elements to reduce the infiltration of ambient air into the permeable hot air device.

[0075] It should also be recognized that, in one embodiment, the air directed to one or more sealing elements may be recirculated system air from another part of the permeable hot air device. In another embodiment, the air directed to one or more sealing elements may originate from at least one of a Yankee hot air system exhaust air stream, a vacuum pump exhaust air stream, a turbine exhaust air stream, or any other heated air stream. And in yet another embodiment, the air directed to one or more sealing elements may be supplied from an unheated air source.

[0076] Furthermore, it should be recognized that the above concepts can be used to control and regulate the humidity level of the system air within a penetrating hot air device.

[0077] Although several embodiments of the invention have been described and illustrated herein, those skilled in the art will readily conceive of various other methods and / or structures for performing the functions described herein and / or obtaining the results and / or one or more advantages described herein, and each of these variations and / or modifications is considered to fall within the scope of the invention. Those skilled in the art will recognize or use many equivalents that can determine the specific embodiments of the invention described herein through conventional experimentation. Therefore, it should be understood that the foregoing embodiments are presented by way of example only, and the invention can be practiced in ways other than those specifically described and claimed within the scope of the appended claims and their equivalents. The invention relates to each individual feature, system, article, material, and / or method described herein. Furthermore, any combination of two or more of the stated features, systems, articles, materials, and / or methods is also included within the scope of the invention if the stated features, systems, articles, materials, and / or methods do not contradict each other.

[0078] All definitions used and defined herein should be understood as controlling over dictionary definitions, definitions in files merged by reference, and / or the general meaning of the defined terms.

[0079] The indefinite articles “a” and “an” used in the specification and claims herein shall be understood to mean “at least one” unless expressly stated to the contrary.

[0080] The phrase “and / or” as used herein in the specification and claims should be understood as “any or both” of the combined elements, meaning that the elements are present together in some cases and not together in others. In addition to the elements specifically indicated by the “and / or” clause, other elements may optionally be present, whether or not they are related to the specifically indicated elements, unless expressly stated to the contrary.

[0081] All references, patents and patent applications and publications cited or mentioned in this application are incorporated herein by reference in their entirety.

Claims

1. A through-type hot air device for drying or bonding paper, tissue paper, or nonwoven fabric webs, the device comprising: A web support structure, wherein the web support structure is configured to be movable; A first component has at least one sealing element adjacent to the web support structure, wherein the at least one sealing element is configured to reduce the permeation of ambient air into the penetrating hot air device; as well as At least one first channel, the at least one first channel being configured to direct air to the at least one sealing element to reduce the permeation of ambient air into the permeable hot air device, wherein the at least one first channel is located within the web support structure and is configured to direct air out of the web support structure to reduce the permeation of ambient air into the permeable hot air device.

2. The device according to claim 1, wherein, The first component is configured to be stationary, and the web support structure is movable relative to the stationary first component.

3. The device according to claim 1, wherein, The web support structure is a through-type hot air roller configured to rotate about a first axis, wherein the at least one first channel is configured to guide air radially outward from the through-type hot air roller.

4. The device according to claim 3, wherein, The first component and the at least one sealing element are positioned within the penetrating hot air roller.

5. The device according to claim 1, wherein, The first component includes one or more exhaust pipes, and the at least one sealing element includes at least one exhaust pipe sealing element. The at least one first channel is configured to direct air to the at least one exhaust duct sealing element to reduce the infiltration of ambient air into the penetrating hot air device.

6. The device according to claim 3, wherein, The penetrating hot air device includes an active area and a non-active area, wherein the first component includes an internal partition and a non-active area baffle, the non-active area baffle being positioned in the non-active area of ​​the penetrating hot air device, and the at least one sealing element includes at least one baffle sealing element; and The at least one first channel is configured to direct air to the at least one baffle sealing element to reduce the infiltration of ambient air through the non-functional area into the penetrating hot air device.

7. The device according to claim 6, further comprising: A second component having at least one sealing element adjacent to the penetrating hot air roller, wherein the at least one sealing element of the second component is configured to reduce the permeation of ambient air into the penetrating hot air device; as well as At least one second channel, the at least one second channel being configured to direct air to at least one sealing element of the second component to reduce the permeation of ambient air into the penetrating hot air device; The second component includes one or more exhaust pipes, and at least one sealing element of the second component includes at least one exhaust pipe sealing element. The at least one second channel is configured to direct air to the at least one exhaust duct sealing element to reduce the infiltration of ambient air into the penetrating hot air device.

8. The device according to claim 1, wherein, The at least one first channel is configured to recirculate system air from another part of the permeable hot air device to the at least one sealing element.

9. The device according to claim 1, wherein, The at least one first channel is configured to direct heated air from at least one of the Yankee hot air system exhaust air flow, vacuum pump exhaust air flow, turbine exhaust air flow, or any other heated air flow to the at least one sealing element.

10. The device according to claim 3, wherein, The penetrating hot air device includes an active area and a non-active area, wherein the first component includes an air chamber configured to cover the non-active area of ​​the penetrating hot air device; and The at least one first channel is configured to guide air through the air chamber and to the at least one sealing element to reduce the infiltration of ambient air into the penetrating hot air device.

11. The device according to claim 1, wherein, The first component includes at least one of a perforated plate, a nozzle, a channel, and a slot for distributing air to the at least one sealing element.

12. The device according to claim 1, wherein, Airflow through the channels can be controlled by adjusting fan speed, damper position, or variable flow restriction within the at least one first channel or within the at least one sealing element itself, or by other means, to allow for uniform distribution of air to the at least one sealing element.

13. The device according to claim 3, wherein, At least a portion of the at least one first channel extends within the penetrating hot air roller and along the first axis.

14. The device of claim 1, further comprising a fan configured to pump air to the at least one sealing element.

15. The device according to claim 1, wherein, The web support structure is a flat strip, which is configured to translate along a horizontal or inclined plane.

16. A method of operating a penetrating hot air device, the penetrating hot air device being used to dry or bond paper, tissue paper, or nonwoven fabric webs, the method comprising: Place the web portion on a part of the web-supporting structure; Move the web support structure so that the web moves together with the web support structure; The process air is guided through the web support structure, wherein the process air leaves the web support structure and enters the exhaust duct of the penetrating hot air equipment; A first component is provided, the first component having at least one sealing element adjacent to the web support structure, wherein the at least one sealing element on the first component is configured to reduce the permeation of ambient air into the penetrating hot air device; and Heated air is directed to the at least one sealing element to reduce the permeation of ambient air into the penetrating hot air device, wherein the heated air directed to the at least one sealing element originates from a location different from the exhaust duct of the penetrating hot air device, and wherein the heated air is used to reduce the permeation of ambient air into the penetrating hot air device.

17. The method according to claim 16, wherein, The heated air originates from at least one of the following: preheated ambient air, turbine exhaust air, Yankee hot air system exhaust air, vacuum pump exhaust air, or other heated airflow in the paper machine or factory environment, or any other source of hot air.

18. The method of claim 16, wherein the amount of heated air flowing to the at least one sealing element is controlled by adjusting the fan speed, damper position, or variable flow restriction.

19. A through-type hot air device for drying or bonding paper, tissue paper, or nonwoven fabric webs, said device comprising: a) A rotating web support structure, the rotating web support structure comprising: a support surface having a plurality of openings to allow air to pass through; and a web winding angle defining an active and inactive area of ​​the web support structure and creating an active and inactive airflow area of ​​the penetrating hot air device; b) A stationary structure, wherein the rotating web-bearing structure rotates relative to the stationary structure, wherein the stationary structure is positioned to cover the non-operating area of ​​the penetrating hot air device, the stationary structure including one or more sealing elements configured to reduce the infiltration of ambient air into the operating area of ​​the penetrating hot air device relative to a structure without the one or more sealing elements but otherwise identical; and c) One or more channels in the stationary structure for delivering recirculated air or other heated airflow to the one or more of the sealing elements, thereby further reducing the infiltration of ambient air into the working area of ​​the penetrating hot air device, and wherein one or more channels in the air chamber of the stationary structure cover the non-working area to guide air through a portion of the web-bearing structure not including the web.

20. The device according to claim 19, wherein, The heated airflow originates from at least one of the following: preheated ambient air, turbine exhaust air, Yankee hot air system exhaust air, vacuum pump exhaust air, or other heated airflow in the paper machine or factory environment, or any other source of hot air.

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