A coating device and coating method for a board laying adhesive

Abstract

A kind of board laying adhesive coating device and coating method, including hopper, coating mechanism and platform mechanism, the bottom of hopper is closed, one side is provided with opening, coating mechanism has a coating frame with two open sides, coating frame is set in the bottom of hopper, and can be drawn out from the opening, platform mechanism is used to place the support part of board and is set in the side of hopper, board is connected with the lower edge of the opening of hopper, coating frame is located above board when being drawn out from hopper, and there is gap between the bottom of the end of coating frame away from hopper and the board, adhesive on board can be retained on board through the gap when coating frame is pushed back to hopper.The lower end of coating frame is open, adhesive can be dropped on board without obstruction when it is drawn out from hopper, and there is no plugging situation, which can be suitable for adhesive with large viscosity and poor fluidity.Coating efficiency can be effectively improved, and construction time can be saved.

Description

Technical Field

[0001] This invention relates to an auxiliary coating tool for adhesives used in building panel laying, specifically a panel laying adhesive coating device and coating method. Background Technology

[0002] In the field of building decoration, wall tiles, floor tiles, and other slabs typically require the application of cement mortar or other adhesives to their backing before installation. This application of cement mortar and other adhesives consumes a significant portion of the installation time. One existing auxiliary coating device uses a hopper with a narrow, elongated outlet at the bottom. As the hopper discharges material through the outlet, the slab moves horizontally relative to the hopper. During this movement, the adhesive is applied to the slab surface through material leakage. This structure provides some assistance in applying adhesives with good flowability. However, some adhesives used for slab installation have poor flowability, such as the cement mortar used for wall tiles, which has a high viscosity. During the hopper discharge process, bridging and blockage can easily occur at the outlet, resulting in discontinuous and uneven application of the adhesive on the slab surface. To improve the discharge effect, components such as mixing, vibrating, or extrusion devices are usually required inside the hopper, necessitating an additional power source. This leads to excessively large and heavy equipment, making it difficult to practically apply in general interior decoration. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the narrow feed inlet of the existing adhesive coating device, which is prone to clogging of adhesives with poor flowability, resulting in intermittent and uneven coating. The present invention provides a board laying adhesive coating device and coating method.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a board bonding adhesive coating device, comprising a hopper, a coating mechanism, and a platform mechanism. The hopper is used to contain the adhesive to be coated, and the bottom of the hopper is closed, with a laterally extending opening on one side of the lower end of the hopper. The coating mechanism has a coating frame, which is open on both the upper and lower sides. The coating frame is located at the bottom of the hopper and can be pulled out from the opening along with the adhesive that has entered the coating frame. The platform mechanism is used to place the board to be coated with adhesive, and a support part for supporting the board is located on one side of the hopper, so that the board can be in contact with the lower edge of the opening of the hopper, and the coating frame pulled out from the hopper is located above the board. There is a gap between the bottom of the end of the coating frame away from the hopper and the board, so that when the coating frame is pushed back into the hopper, the adhesive that falls onto the board can be retained on the board through the gap.

[0005] The coating mechanism further includes a baffle plate for preventing the adhesive material from falling to the bottom of the hopper after the coating frame is pulled out of the hopper. The baffle plate is connected to the upper edge of the end of the coating frame facing the inside of the hopper. The width of the baffle plate is the same as the width inside the hopper. A slit is provided on the hopper for the baffle plate to extend out of the hopper.

[0006] Below the slit of the hopper, there is a discharge port for discharging material leaking from below the baffle plate.

[0007] The coating frame is equipped with a scraper at the end away from the hopper, and there is a gap between the scraper and the plate placed on the platform mechanism for the adhesive to pass through.

[0008] The lower edge of the scraper has a toothed structure.

[0009] The scraper blade is height-adjustable on the coating frame via a height-adjustable structure.

[0010] The portion of the baffle plate extending out of the hopper is connected to a limiting mechanism. The limiting mechanism can be adjusted along the length of the baffle plate to limit the extent to which the coating frame is pulled out of the hopper through the cooperation between the limiting mechanism and the side wall of the hopper.

[0011] The limiting mechanism is a slider disposed on the edge of the baffle plate, and the slider is provided with locking screws for positioning it on the baffle plate.

[0012] The coating frame is provided with a partition extending along the direction of the coating frame extraction. The left and right sides of the partition are divided into different material storage areas. Each material storage area is equipped with a removable cover plate to select the number of material storage areas to be opened according to the size of different specifications of the board.

[0013] This invention also provides a method for applying adhesive to board panels. First, a coating frame is pushed into a hopper, and the hopper is filled with prepared adhesive for later use. When adhesive needs to be applied to the board panel, the board panel is placed on a platform mechanism, and the edge of the board panel is aligned with the lower edge of the opening on the hopper. Then, the coating frame is pulled out of the hopper, allowing the adhesive in the coating frame to fall onto the board panel. The pulling distance of the coating frame is approximately equal to the width of the board panel. After the coating frame is pulled out to the correct position, it is pushed back into the hopper. During the pushing process, a layer of adhesive is retained on the board panel through the gap between the end of the coating frame and the board panel, while excess adhesive is carried back to the hopper by the coating frame, thus completing the adhesive application for one board panel.

[0014] The beneficial effects of this invention are as follows: the adhesive material in the hopper is drawn out of the hopper by pulling out the coating frame, and the lower end of the coating frame is open. After it is pulled out of the hopper, the adhesive material can fall onto the board without obstruction, preventing clogging. This method is suitable for adhesive materials with high viscosity and poor flowability. Applying adhesive material to the board only requires pulling out the coating frame and then pushing it back, which effectively improves coating efficiency and saves construction time. The adhesive material applied to the board by this device is continuous and uniform, ensuring the consistency of coating on each board and improving construction quality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the first embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the hopper and coating mechanism in the first embodiment.

[0017] Figure 3 This is a schematic diagram of one way the scraper is set on the coating frame.

[0018] Figure 4 yes Figure 2 A magnified view of region A in the middle.

[0019] Figure 5 This is a schematic diagram of one type of coating frame structure.

[0020] Figure 6 This is a schematic diagram of an embodiment of a docking method between a hopper and a plate.

[0021] Figure 7 This is a schematic diagram of one type of platform organization structure.

[0022] Figure 8 This is a schematic diagram of the second embodiment of the present invention.

[0023] The markings in the diagram are: 1. Hopper, 101. Opening, 102. Slit, 103. Discharge port, 104. Positioning block, 105. Connecting strip, 2. Coating mechanism, 201. Coating frame, 2011. Partition, 2012. Storage area, 2013. Cover plate, 2014. Slot, 2015. Handle, 202. Baffle plate, 2021. Limiting mechanism, 2022. Locking screw, 2023. Scale line, 203. Scraper, 204. Secondary scraper, 3. Platform mechanism, 301. Support part, 302. Positioning plate, 303. Support positioning part, 4. Plate, 5. Gap. Detailed Implementation

[0024] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. The specific contents listed in the following embodiments are not limited to the technical features necessary to solve the technical problem described in the claims. Furthermore, the enumerations are merely a part of the present invention, and not all of the embodiments.

[0025] This invention Figure 1 and 2 The hopper 1 in the illustrated embodiment is a frontal cross-section view. The hopper 1 is essentially a container open at the top and closed at the bottom, its internal space used to hold the adhesive for coating. A coating mechanism 2 is installed in the hopper 1. This coating mechanism 2 has a coating frame 201 open on both the top and bottom, the width of which is approximately equal to the width of the internal space of the hopper 1. A laterally extending opening 101 is provided on one side of the lower end of the hopper 1. The coating frame 201 is located at the bottom of the hopper 1 and can be pulled out of the hopper 1 through the opening 101. Therefore, when the coating frame 201 is inside the hopper 1, the adhesive can enter the coating frame 201. When the coating frame 201 is pulled out of the hopper 1, the adhesive inside the coating frame 201 is carried out of the hopper 1 and leaks down from the open bottom of the coating frame 201.

[0026] A platform mechanism 3 is located below the hopper 1. A support portion 301 for placing the sheet material 4 is located on one side of the hopper 1. After the sheet material 4, coated with adhesive, is placed on this support portion 301, it connects with the lower edge of the opening 101 of the hopper 1 and is positioned below the coating frame 201 that has been withdrawn from the hopper 1. Adhesive material leaking from the bottom of the coating frame 201 falls onto the sheet material 4. The extent to which the coating frame 201 is withdrawn from the hopper 1 is approximately equal to the width of the sheet material 4, ensuring that the entire width of the sheet material 4 is covered with adhesive material.

[0027] like Figure 1 and 3 As shown, a gap 5 exists between the bottom of the coating frame 201 at the end furthest from the hopper 1 (i.e., the end further out after being pulled out of the hopper 1) and the plate 4. This gap 5 can be formed by slotting the lower part of the frame of the coating frame 201. When the coating frame 201 is pushed back into the hopper 1, the frame at this end can flatten the adhesive on the plate 4, making the adhesive evenly spread. The height of the gap 5 determines the thickness of the adhesive coating on the plate 4. The adhesive of the predetermined coating thickness can be retained on the plate 4 through the gap 5, while excess adhesive is pushed back into the hopper 1.

[0028] The depth of the coating frame 201 can be appropriately greater than the thickness of the adhesive to be coated on the board 4, ensuring that sufficient adhesive falls onto the board 4 for even spreading. However, the depth of the coating frame 201 should not be too large, otherwise excess adhesive will easily accumulate when pushed back into the hopper 1, exceeding the height of the opening 101 on the hopper 1. The depth of the coating frame 201 can be set to 1.5-2 times the average coating thickness of the adhesive sheets on various boards 4. This avoids the accumulation of excess adhesive when pushing it back into the hopper 1, and also allows for adjustment margins for different adhesive coating thickness requirements.

[0029] exist Figure 1 and 3 In the illustrated embodiment, a scraper 203 is also provided at the end of the coating frame 201 away from the hopper 1, with a gap 5 between the lower end face of the scraper 203 and the plate 4 for the adhesive to pass through. The lower edge of the scraper 203 can have a toothed structure, so that the adhesive coated on the plate 4 forms staggered stripes to facilitate laying. The scraper 203 can be set on the coating frame 202 by a height adjustment structure, making its height adjustable so as to adjust the size of the gap 5 as needed, thereby adjusting the thickness of the adhesive coated on the plate 4. The height adjustment structure can take the form of, for example, setting a vertical guide groove on the edge of the coating frame 202, with the scraper 203 connected to the guide groove by a slider on its back, and fixed in place by a locking screw after adjustment. Alternatively, the height can be adjusted by connecting the scraper 203 to the edge of the coating frame 202 by a vertical lead screw.

[0030] Figure 6 The diagram illustrates an embodiment where the plate 4 and the lower edge of the opening 101 of the hopper 1 are joined. A flexible joining strip 105 is provided at the lower edge of the opening 101. This joining strip 105 ensures a close fit with the plate 4 during joining, preventing material leakage. Furthermore, when the height of the plate 4 is not perfectly matched to the lower edge of the opening 101, but slightly lower, the joining strip 105, when pressed by the plate, forms a transition slope between the plate 4 and the bottom surface of the hopper 1, facilitating the pushing of the adhesive material back into the hopper 1. Moreover, in its free state, the joining strip 105 can have an upwardly curved upper surface, slightly higher than the bottom surface of the hopper 1. The outwardly extending end of the joining strip 105 extends obliquely downwards towards the plate 4. When the plate 4 presses against the joining strip 105, the joining strip 105 is pressed down, lowering its upper surface to facilitate the passage of the adhesive material. When the plate 4 is removed, the connecting strip 105 returns to its original state, and its slightly raised upper surface can delay the outflow of the adhesive material in the hopper 1.

[0031] like Figure 1 and 2As shown, the coating mechanism 2 also includes a baffle plate 202. One end of the baffle plate 202 is connected to the upper edge of the end of the coating frame 201 facing the inside of the hopper 1 (i.e., the end that remains inside the hopper 1 after being pulled out), and the other end extends in the opposite direction to the direction in which the coating frame 201 is pulled out, extending from a slit 102 provided on the hopper 1 to the outside of the hopper 1. The width of the baffle plate 202 is the same as the width inside the hopper 1, and its length allows it to always extend from the slit 102, thereby preventing the adhesive material from falling to the bottom of the hopper 1 after the coating frame 201 is pulled out of the hopper 1. The baffle plate 202 reduces the resistance when the coating frame 201 is pushed back into the hopper 1, and also limits the extent to which the coating frame 201 is pulled out of the hopper 1. For example... Figure 2 and 4 As shown, a limiting mechanism 2021 is connected to the portion of the baffle plate 202 extending out of the hopper 1. The limiting mechanism 2021 is detachably mounted on the baffle plate 202 and its connection position is adjustable along the length of the baffle plate 202. When the coating frame 201 is pulled out of the hopper 1, the baffle plate 202 correspondingly enters the hopper 1. When the baffle plate 202, along with the limiting mechanism 2021, reaches the outer wall of the hopper 1, it is blocked. The engagement of the limiting mechanism 2021 with the side wall of the hopper 1 limits the extent to which the coating frame 201 is pulled out of the hopper 1.

[0032] Figure 4 In the illustrated embodiment, the limiting mechanism 2021 is a slider disposed on the edge of the baffle plate 202. It can be disposed on one side of the baffle plate 202 or on both sides. The edge of the baffle plate 202 has corresponding scale lines, which can be used to indicate the extent to which the coating frame 201 withdraws from the hopper 1. After the slider is adjusted to the correct position, the locking screw 2022 disposed on the slider is used to position the slider on the baffle plate 202.

[0033] During the movement of the coating frame 201, to prevent the adhesive material from leaking through the seams and falling below the baffle plate due to poor fit between the components, thus hindering the coating frame 201 from returning to the hopper 1, it can be done as follows: Figure 2 As shown, a discharge port 103 is provided below the slit 102 of the hopper 1. During the process of the coating frame 201 pushing back the hopper 1, the adhesive material that has leaked below the baffle plate can be pushed out through the discharge port 103.

[0034] Figure 5The diagram shows an embodiment of the coating frame 201. In this embodiment, the coating frame 201 has two partitions 2011 extending along the extraction direction of the coating frame, dividing the internal space of the coating frame 201 into three different material storage areas 2012. Each material storage area 2012 is equipped with a removable cover plate 2013. When the size of the board 4 to be coated with adhesive is small, the cover plate 2013 can be used to close part of the material storage area 2012. For example, the width of one of the material storage areas (the one shown open in the figure) is set to 30cm, which can be used to coat a board 30cm wide. The width of the other adjacent material storage area (the one shown with the cover plate cut open in the figure) is set to a total width of 50cm (including the partition between the two), which can be used to coat a board 50cm wide. Adding a third material storage area allows for coating of even wider boards. The number and size of the partitions 2011 and the storage areas 2012 are not limited to the above embodiments. The number of storage areas to be opened can be selected according to the size of the sheet material of different specifications. Corresponding slots 2014 can be provided on the edges of the partitions 2011 and the coating frame 201 to allow the cover plate 2013 to be embedded therein without protruding above the upper surface of the coating frame 201. A slot or other structure can be provided on the cover plate 2013 to facilitate its removal.

[0035] The present invention, through the division of the material storage area in the coating frame 201 and the limiting of the withdrawal range of the coating frame 201 by the upper limit mechanism 2021 of the baffle plate 202, can be matched with different specifications of board length and width, and can be applied to a variety of different specifications of boards, thus having higher applicability.

[0036] The platform mechanism 3 can be fixedly connected to the hopper 1 as a whole, or it can be a separate structure. Figure 7 The diagram shows a schematic of a platform mechanism 3 with an independent structure. The support portion 301 on the platform mechanism 3 for placing the sheet material 4 takes the form of multiple spaced support beams, or spaced support rollers. Excess adhesive material can fall through the gaps, reducing the amount of adhesive material falling onto the support portion 301 and thus preventing soiling of the side of the sheet material that does not require coating when placing it. The platform mechanism 3 can be provided with a support positioning part 303 for positioning the hopper 1 at its assembly position; this can be a groove or other similar structure. At the bottom of the hopper 1, as shown... Figure 2The positioning block 104 is matched with the above. A positioning plate 302 for positioning the plate 4 can also be provided on the platform mechanism 3. The position of the positioning plate 302 corresponds to one side of the coating frame 201, ensuring that one edge of the plate 4 placed on the platform mechanism 3 is opposite to or slightly protrudes from one side of the inner cavity of the coating frame 201, thus defining the coating position on the plate 4 after the coating frame 201 is removed. Support legs can be provided below the platform mechanism 3 as needed to provide a suitable operating height. A receiving box is provided below the platform mechanism 3 to collect fallen adhesive material for easy cleaning and recycling.

[0037] Based on the coating apparatus described above, the present invention employs the following method for applying adhesive when laying boards. First, the coating frame 201 is pushed into the hopper 1, and the hopper 1 is filled with prepared adhesive, such as cement mortar. After filling, it is set aside. When adhesive needs to be applied to the board, the withdrawal range of the coating frame 201 and the number of openings of the material storage areas 2012 within the coating frame 201 are adjusted according to the size of the board 4. The board 4 is placed on the support portion 301 of the platform mechanism 3, with the edge of the board 4 contacting and aligning with the lower edge of the opening 101 on the hopper 1, and one side of the board 4 facing one side of the coating frame 201. Then, the coating frame 201 is withdrawn from the hopper 1, and the adhesive in the coating frame 201 falls onto the board 4. The withdrawal range of the coating frame 201 is limited by the limiting mechanism 2021, making it approximately equal to the width of the board 4. After the coating frame 201 is withdrawn to its final position, it is pushed back into the hopper 1. During the push-back process, a layer of adhesive is retained on the plate 4 through the gap 5 between the end of the coating frame 201 and the plate 4, while the excess adhesive is carried back to the hopper 1 by the coating frame 201, thus completing the adhesive coating of a plate.

[0038] In architectural decoration, there are some special types of boards that are narrow in width but very long in length. Designing a coating device according to their length would result in an oversized device. To meet the usage requirements in such special cases, this invention also provides... Figure 8 The embodiment shown. In this embodiment, in addition to the structure described above, a structure similar to the protruding end of the coating frame 201, allowing the adhesive to pass through, is also provided on one side of the coating frame 201 located in the extraction direction. For example, a secondary scraper 204 is provided on this side, with a structure similar to the scraper 203, except that the secondary scraper 204 is located inside the side of the coating frame 201. In this embodiment, the platform mechanism 3 does not have a structure similar to the one described above. Figure 7The positioning plate 302 is shown. When applying adhesive to this long plate, the extension of the coating frame 201 is set to the width of the plate 4. The length direction of the plate 4 is perpendicular to the withdrawal direction of the coating frame 201. One end of the plate 4 corresponds to one side of the coating frame 201, and the side edge is in contact with the lower edge of the opening 101 of the hopper 1. The coating frame 201 is withdrawn, allowing the adhesive inside the coating frame 201 to fall onto the plate 4. After the coating frame 201 is withdrawn into place, the plate 4 is pushed along the length direction of the plate, so that the part of the plate 4 outside the coating frame 201 enters below the coating frame 201 until the outer end of the plate 4 is aligned with the side edge of the coating frame 201. During this process, the part of the plate 4 that was originally covered with adhesive inside the coating frame 201 passes under the secondary scraper 204, allowing the adhesive to be spread out and retain a predetermined thickness. The part of the plate 4 that was originally outside the coating frame 201 enters the coating frame 201 and is covered with adhesive. Once the end of the board 4, which was originally outside the coating frame 201, is aligned with the coating frame 201, the coating frame 201 is pushed back into the hopper 1. The scraper 203 spreads the adhesive material remaining on the surface of the board 4 inside the coating frame 201 to a predetermined thickness, thus completing the adhesive coating of the long board.

[0039] The above description of specific embodiments is only for the purpose of helping to understand the technical concept and core idea of ​​the present invention. Although specific preferred embodiments have been used to describe and illustrate the technical solutions, they should not be construed as limiting the present invention itself. Those skilled in the art can make various changes in form and detail without departing from the technical concept of the present invention. These easily conceived changes or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A device for applying adhesive to board substrates, characterized in that: The system includes a hopper (1), a coating mechanism (2), and a platform mechanism (3). The hopper (1) is used to hold the adhesive to be coated. The bottom of the hopper (1) is closed, and a laterally extending opening (101) is provided on one side of the lower end of the hopper (1). The coating mechanism (2) has a coating frame (201), which is open on both the upper and lower sides. The coating frame (201) is located at the bottom of the hopper (1) and can be pulled out from the opening (101) with the adhesive that has entered the coating frame (201). The platform mechanism (3) is used to place the adhesive to be coated. The receiving plate (4) has a support part (301) for supporting the plate (4) located on one side of the hopper (1), so that the plate (4) can be connected to the lower edge of the opening (101) of the hopper (1), and the coating frame (201) pulled out from the hopper (1) is located above the plate (4); there is a gap (5) between the bottom of the end of the coating frame (201) away from the hopper (1) and the plate (4), so that when the coating frame (201) is pushed back into the hopper (1), the adhesive material falling onto the plate (4) can be retained on the plate (4) through the gap (5); A flexible connecting strip (105) is provided on the lower edge of the opening (101). The connecting strip (105) has an upward-curving upper surface in its free state, which is slightly higher than the bottom surface of the hopper (1). The outward extension end of the connecting strip (105) extends obliquely downward in the direction of the plate (4). When the plate (4) squeezes the connecting strip (105), the connecting strip (105) will be pressed down to lower its upper surface, which is conducive to the passage of the adhesive. When the plate (4) is removed, the connecting strip (105) returns to its original state, and its slightly higher upper surface can delay the flow of adhesive in the hopper (1).

2. The adhesive coating device for board laying as described in claim 1, characterized in that: The coating mechanism (2) further includes a baffle plate (202) for preventing the adhesive material from falling to the bottom of the hopper (1) after the coating frame (201) is pulled out. The baffle plate (202) is connected to the upper edge of the end of the coating frame (201) facing the inside of the hopper (1). The width of the baffle plate (202) is the same as the width inside the hopper (1). A slit (102) is provided on the hopper (1) for the baffle plate (202) to extend out of the hopper.

3. The adhesive coating device for board laying as described in claim 2, characterized in that: Below the slit (102) of the hopper (1), there is a discharge port (103) for discharging material leaking below the baffle plate.

4. The adhesive coating device for board laying as described in claim 1, characterized in that: The coating frame (201) is provided with a scraper (203) at one end away from the hopper (1), and there is a gap (5) between the scraper (203) and the plate (4) placed on the platform mechanism (3) for the adhesive to pass through.

5. The adhesive coating device for board laying as described in claim 4, characterized in that: The lower edge of the scraper (203) has a toothed structure.

6. The adhesive coating device for board laying as described in claim 4, characterized in that: The scraper (203) is set on the coating frame (201) with adjustable height via a height adjustment structure.

7. The adhesive coating device for board laying as described in claim 2, characterized in that: The portion of the baffle plate (202) extending out of the hopper (1) is connected to a limiting mechanism (2021). The limiting mechanism (2021) can be adjusted along the length of the baffle plate (202) to limit the extent to which the coating frame (201) is pulled out of the hopper (1) by the cooperation between the limiting mechanism (2021) and the side wall of the hopper (1).

8. The adhesive coating device for board laying as described in claim 7, characterized in that: The limiting mechanism (2021) is a slider provided on the edge of the baffle plate (202), and the slider is provided with a locking screw (2022) for positioning it on the baffle plate (202).

9. The adhesive coating device for board laying as described in claim 1, characterized in that: The coating frame (201) is provided with a partition (2011) extending along the coating frame extraction direction. The left and right sides of the partition (2011) are divided into different storage areas (2012). Each storage area (2012) is provided with a removable cover plate (2013) to select the number of storage areas to be opened according to the size of different specifications of the board.

10. A coating method using the adhesive coating apparatus for board laying as described in claim 1, characterized in that: First, push the coating frame (201) into the hopper (1) and fill the hopper (1) with the prepared adhesive material for later use. When the adhesive material needs to be coated on the board, place the board (4) on the platform mechanism (3) and align the edge of the board (4) with the lower edge of the opening (101) on the hopper (1). Then, pull the coating frame (201) out of the hopper (1) so that the adhesive material in the coating frame (201) falls onto the board (4). The pulling range of the coating frame (201) is equivalent to the width of the board (4). After the coating frame (201) is pulled out to the position, push it back into the hopper (1). During the pushing back process, a layer of adhesive material is retained on the board (4) through the gap (5) between the end of the coating frame (201) and the board (4), while the excess adhesive material is carried back to the hopper (1) by the coating frame (201), thus completing the adhesive material coating of a board.

Images