Hot melt adhesive coating head

Abstract

The utility model discloses a hot melt adhesive coating head which comprises an adhesive supply pipe, a first adhesive buffer area, a runner area, a second adhesive buffer area and a coating area, an outlet of the adhesive supply pipe is communicated with the first adhesive buffer area, the runner area is located between the first adhesive buffer area and the second adhesive buffer area, and the coating area is located on the side portion of the second adhesive buffer area. The runner area is provided with a plurality of glue solution runners, one end of each glue solution runner is communicated with the first glue solution buffer area, the other end of each glue solution runner is communicated with the second glue solution buffer area, and the glue solution runners are arranged in a crossed mode and communicated. According to the hot melt adhesive coating head provided by the utility model, adhesive liquid is uniformly conveyed and dispersed when the adhesive liquid runners which are mutually crossed and communicated are adopted, so that the problem of unstable weight of a coating sheet caused by non-uniform flowing of the adhesive liquid in the coating process is solved, the weight precision of the coating sheet is improved, and uniform, flat and neat appearance of a coated product is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to hot melt adhesive coating technical field, concretely relates to a hot melt adhesive coating head. BACKGROUND

[0002] Hot melt adhesive coating is to heat melt solid soluble polymer to flow liquid adhesive with certain viscosity, and then coat on the base material. Hot melt adhesive coating needs to use coating head. The glue end delivers glue liquid to the glue supply pipe behind the coating head. The glue supply pipe delivers glue liquid to the glue liquid buffer area, and then enters the flow channel area. After the glue liquid is divided in the flow channel area, it enters the subsequent glue liquid buffer area. When the glue liquid fills the subsequent glue liquid buffer area, it overflows to the coating area for coating. The glue liquid is scraped on the release film or release paper in the coating area, and continuous coating is realized by the continuous rotation of the coating roller.

[0003] However, this coating head has the following problems: the glue liquid channels in the flow channel area are arranged in parallel and perpendicular to the glue liquid buffer area, and each glue liquid channel is linearly arranged. The width of each glue liquid channel is about 10mm. This arrangement can cause uneven distribution of the delivery pressure when the glue liquid passes through each glue liquid channel, resulting in uneven thickness of the coated glue surface. The glue liquid passes through the flow channel at a low speed and is unevenly heated, causing the glue liquid to be differentially heated. Since hot melt adhesive is a high-viscosity material, when the glue liquid fills each buffer area, the glue liquid channel and the buffer area form a bridge, and the glue liquid is directly delivered to the coating area through the bridge, causing uneven thickness of the coated glue surface and obvious scratches on the coated product.

[0004] Therefore, the present application is proposed. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a hot melt adhesive coating head to solve the above technical problems.

[0006] The utility model realizes the following technical scheme:

[0007] A hot melt adhesive coating head comprises a glue supply pipe, a first glue liquid buffer area, a flow channel area, a second glue liquid buffer area, and a coating area. The outlet of the glue supply pipe is in communication with the first glue liquid buffer area. The flow channel area is located between the first glue liquid buffer area and the second glue liquid buffer area. The coating area is located at the side of the second glue liquid buffer area. The flow channel area is provided with a plurality of glue liquid channels. One end of each glue liquid channel is in communication with the first glue liquid buffer area, and the other end is in communication with the second glue liquid buffer area. Each glue liquid channel is crosswise arranged and in communication.

[0008] As a preferred design, the extension directions of the glue liquid channels are the same.

[0009] As a preferred design, the first glue liquid buffer zone, the flow channel zone, the second glue liquid buffer zone and the coating zone are arranged on the base, and each glue liquid flow channel is a groove flow channel formed in the base.

[0010] As a preferred design, the width of each glue liquid flow channel is 5-7mm.

[0011] As a preferred design, the first glue liquid buffer zone and the second glue liquid buffer zone are groove structures formed in the base.

[0012] As a preferred design, the glue supply pipe is inserted into the base and communicates with the first glue liquid buffer zone.

[0013] As a preferred design, a third glue liquid buffer zone is further arranged between the second glue liquid buffer zone and the coating zone, the third glue liquid buffer zone is a groove structure formed in the base, and the second glue liquid buffer zone and the third glue liquid buffer zone are arranged in abutment.

[0014] As a preferred design, the base is provided with a cover plate, and the cover plate covers each glue liquid buffer zone, coating zone and flow channel zone.

[0015] As a preferred design, a partition plate is arranged between the cover plate and the base, the partition plate is fixed on the base, and the partition plate is provided with an opening at the position of the coating zone.

[0016] As a preferred design, a plurality of mounting holes are arranged on the base, and the cover plate and the partition plate are fixedly connected with the base through the mounting holes.

[0017] Compared with the prior art, the advantages and beneficial effects of the hot melt adhesive coating head are as follows:

[0018] 1. When the hot melt adhesive coating head adopts the glue liquid flow channels arranged in mutual cross communication, the glue liquid conveying is dispersed uniformly, the problem of unstable coating piece weight caused by uneven glue liquid flow in the coating process is solved, the weight precision of the coating piece is improved, the problem of scratches caused by uneven coating in the coating process is solved, the appearance of the coated product is uniform, flat and neat, the problem of increase of related substances caused by poor glue liquid flowability of the coating head and long time heating is solved, the glue liquid flows uniformly, and the increase of related substances is avoided.

[0019] 2. The hot melt adhesive coating head sets the partition plate between the cover plate and the base, and the opening is formed in the partition plate at the position corresponding to the coating zone, the length of the opening can be changed to adjust the coating width, which is convenient and flexible, and solves the problem that the existing coating head cannot adjust the coating width. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the example embodiments of the present application, the drawings used in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained without creative labor on the premise that the drawings are not limited. In the drawings:

[0021] Figure 1 It is a structural schematic diagram of the existing coating head;

[0022] Figure 2 It is a structural schematic diagram of the coating head provided by the present application when the cover plate and the partition plate are removed;

[0023] Figure 3 It is a top view structural schematic diagram of the coating head provided by the present application;

[0024] Figure 4 It is a structural schematic diagram of the coating head provided by the present application when the partition plate is removed.

[0025] In the drawings:

[0026] 1-glue solution channel; 2-glue solution buffer zone A, 3-glue solution buffer zone B; 4-glue solution buffer zone C; 5-coating zone, 11-glue supply pipe, 12-first glue solution buffer zone, 13-flow channel zone, 1301-glue solution flow channel, 14-second glue solution buffer zone, 15-base, 16-third glue solution buffer zone, 17-cover plate, 18-partition plate, 19-aperture, 20-mounting hole. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present application more clear and apparent, the present application will be further described in detail below with examples and drawings, and the schematic embodiments of the present application and the description thereof are only used to explain the present application, and not as a limitation of the present application.

[0028] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without necessarily adopting these specific details. In other embodiments, in order to avoid obscuring the present application, well-known structures, circuits, materials or methods are not specifically described.

[0029] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] In the description of this utility model, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0031] like Figure 1 The diagram shows an existing hot melt adhesive applicator. Nine adhesive channels 1 are shown, each perpendicular to and connected to the adhesive buffer zones at both ends. Each adhesive channel 1 is a straight strip, linearly spaced, and approximately 10mm wide. When adhesive is added to adhesive buffer zone A2, it flows through the straight adhesive channels 1 to adhesive buffer zone B3, overflows, flows to adhesive buffer zone C4, and finally reaches the coating area 5. However, the arrangement of these linearly spaced, straight strip-shaped adhesive channels 1 results in uneven pressure distribution when the adhesive passes through each channel 1, leading to uneven coating thickness. The adhesive also flows at a lower speed and is heated unevenly in this channel, causing differences in the heat received by the adhesive. Furthermore, since hot melt adhesive is a high-viscosity material, when using this linearly spaced, vertically arranged strip-shaped channel, once the adhesive fills each buffer zone, the adhesive channel 1 and the buffer zone will form a bridge, causing the adhesive to flow directly from this bridge to the coating area 5 instead of overflowing from the adhesive buffer zone C 4. This results in uneven coating thickness and obvious scratches on the finished coating.

[0032] To address the above issues, this embodiment provides a hot melt adhesive coating head, including an adhesive supply tube 11, a first adhesive buffer zone 12, a flow channel zone 13, a second adhesive buffer zone 14, and a coating zone 5. The first adhesive buffer zone 12, the flow channel zone 13, the second adhesive buffer zone 14, and the coating zone 5 are all arranged on a base 15.

[0033] The glue supply pipe 11 penetrates through the base 15 to the first glue buffer area 12, and the glue supply end is rotated by the gear pump to deliver glue to the glue supply pipe 11, and the glue flows from the glue supply pipe to the first glue buffer area 12.

[0034] The flow channel area 13 is located between the first glue buffer area 12 and the second glue buffer area 14 to guide the glue from the flow channel area 13 to the second glue buffer area 14.

[0035] The coating area 5 is located at the side of the second glue buffer area 14, and the glue flowing into the second glue buffer area 14 flows from the second glue buffer area 14 to the coating area 5 through overflow.

[0036] A plurality of glue flow channels 1301 are arranged in the flow channel area 13, one end of each glue flow channel 1301 is communicated with the first glue buffer area 12, and the other end is communicated with the second glue buffer area 14, each glue flow channel 1301 is arranged in cross and communicated, and each cross glue flow channel 1301 is arranged in the entire flow channel area 13.

[0037] In this embodiment, because the cross glue flow channels 1301 are arranged, the flow channels for glue supply are more, and each glue flow channel 1301 is arranged in an inclined manner, and the path for delivering glue is correspondingly lengthened, so that the glue flowing out of each area of the first glue buffer area 12 can be dispersedly delivered through the cross glue flow channels 1301, without being concentrated in the strip-shaped channel for delivery, so that the delivery pressure can be dispersed, the uniformity of the coating thickness can be improved, the problem of unstable coating weight caused by uneven glue flow during coating process is solved, and the coating weight precision is improved; and because the dispersed delivery in the cross communicated flow channels can improve the delivery rate, the glue is uniformly heated, and the situation of related substances caused by poor glue flowability and long time heating of the glue is avoided; and the dispersed delivery also avoids the formation of a bridge between the glue flow channel 1301 and the first buffer area, further improves the uniformity of the coating thickness, and does not cause obvious scratch phenomenon, so that the appearance of the coating product is uniform, flat and neat.

[0038] Further, in an optional embodiment, each glue flow channel 1301 with the same extension direction is connected end to end, so that each glue flow channel 1301 is communicated with each other, and more channels are provided for the flow of glue. Each glue flow channel 1301 is a groove channel arranged on the base 15. The first glue buffer area 12 and the second glue buffer area 14 are both groove structures arranged on the base 15. The width of each glue flow channel 1301 is 5-7mm, which reduces the width of the single glue flow channel 1301 and reduces the delivery pressure.

[0039] A third glue liquid buffer area 16 is further arranged between the second glue liquid buffer area 14 and the coating area 5, the third glue liquid buffer area 16 is a groove structure arranged on the base 15, and the second glue liquid buffer area 14 and the third glue liquid buffer area 16 are arranged at intervals. The glue liquid overflowing from the second glue liquid buffer area 14 enters the third glue liquid buffer area 16 and then overflows to the coating area 5.

[0040] In another optional embodiment, as shown in Figure 3 The base 15 is provided with a cover plate 17, which covers the glue liquid buffer areas, the coating area 5 and the flow channel area 13. A partition plate 18 is arranged between the cover plate 17 and the base 15, and the cover plate 17 and the partition plate 18 are both fixed on the base 15. A plurality of mounting holes 20 are arranged on the base 15, and the cover plate 17 and the partition plate 18 are both mounted on the base 15 through the mounting holes 20. The partition plate 18 is provided with an opening 19 at the position of the coating area 5, and the width of the coating can be adjusted by adjusting the length of the opening 19. Compared with the prior art, the width of the coating cannot be adjusted, and the coating head must be replaced when the width of the coating is adjusted. In the embodiment, the width of the coating can be adjusted, and the adjustment is convenient and flexible.

[0041] The above detailed description is further used to explain the purpose, technical scheme and advantages of the utility model, and it should be understood that the above is only a specific embodiment of the utility model, and is not used to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A hot melt adhesive applicator, characterized in that, It includes a glue supply tube (11), a first glue buffer zone (12), a flow channel zone (13), a second glue buffer zone (14), and a coating zone (5). The outlet of the glue supply tube (11) is connected to the first glue buffer zone (12). The flow channel zone (13) is located between the first glue buffer zone (12) and the second glue buffer zone (14). The coating zone (5) is located on the side of the second glue buffer zone (14). The flow channel zone (13) is provided with multiple glue flow channels (1301). One end of each glue flow channel (1301) is connected to the first glue buffer zone (12), and the other end is connected to the second glue buffer zone (14). The glue flow channels (1301) are arranged crosswise and connected.

2. The hot melt adhesive coating head according to claim 1, characterized in that, Each adhesive flow channel (1301) with the same extension direction is connected end to end.

3. The hot melt adhesive coating head according to claim 1, characterized in that, The first adhesive buffer zone (12), the flow channel zone (13), the second adhesive buffer zone (14), and the coating zone (5) are all arranged on the base (15), and each of the adhesive flow channels (1301) is a groove flow channel opened on the base (15).

4. A hot melt adhesive coating head according to claim 3, characterized in that, The width of each adhesive flow channel (1301) is 5-7 mm.

5. A hot melt adhesive coating head according to claim 3, characterized in that, The first adhesive buffer zone (12) and the second adhesive buffer zone (14) are both groove structures opened on the base (15).

6. A hot melt adhesive coating head according to claim 3, characterized in that, The glue supply tube (11) is inserted into the base (15) and connected to the first glue buffer zone (12).

7. A hot melt adhesive coating head according to claim 3, characterized in that, A third adhesive buffer zone (16) is provided between the second adhesive buffer zone (14) and the coating zone (5). The third adhesive buffer zone (16) is a groove structure opened on the base (15). The second adhesive buffer zone (14) and the third adhesive buffer zone (16) are arranged in close contact.

8. A hot melt adhesive coating head according to any one of claims 3 to 7, characterized in that, A cover plate (17) is fixedly provided on the base (15), and the cover plate (17) covers each adhesive buffer zone, coating zone (5) and flow channel zone (13).

9. A hot melt adhesive coating head according to claim 8, characterized in that, A partition (18) is provided between the cover plate (17) and the base (15). The partition (18) is fixed on the base (15). The partition (18) has a notch (19) at the coating area (5).

10. A hot melt adhesive coating head according to claim 9, characterized in that, The base (15) is provided with a plurality of mounting holes (20), and the cover plate (17) and the partition plate (18) are all fixedly connected to the base (15) through the mounting holes (20).

Images