Blade coating device capable of reducing generation of bubbles

Abstract

The utility model discloses a blade coating device capable of reducing generation of bubbles, which is used for coating glue on a membrane material and comprises a back roller and a comma blade, and a gluing gap is arranged between the comma blade and the membrane material. The gluing device further comprises a glue supply component and an adjusting roller, and in the conveying direction of the film material, the adjusting roller is arranged at the position more upstream than the back roller so as to be suitable for adjusting the input angle of the film material input into the gluing gap. The glue supply box is arranged on the glue facing side of the back roller; wherein in the circumferential direction of the back roller, the distance between the contact position A of the glue supply box and the membrane material and the contact position B of the comma scraper and the membrane material is defined as a casting stroke, and the length of the casting stroke is 5-10 cm. According to the utility model, the distance formed by the casting stroke between the scraper and the coating liquid box is reduced, and the glue supply part is used for quantitatively controlling the glue liquid volume in the gluing space, so that the contact area of the coating liquid and the contact surface of the back roller is effectively reduced, and the air introduction and the generation of bubbles are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of coating equipment, in particular to a scraper coating device capable of reducing the generation of bubbles. Background Art

[0002] Coating machines are mainly used for surface coating production of films, papers, etc. This machine coats the rolled film with a layer of glue, paint or ink with specific functions, and rewinds it after drying. It uses a special multi-functional coating head and can achieve various forms of surface coating. At present, the comma blade coating method is widely used in the coating process of film materials because of its simple structure and easy operation, especially in the field of thicker coating and higher coating viscosity.

[0003] Existing Figure 1 The structural diagram of the scraper coating device in the prior art shown in the figure includes a scraper, a back roller and a glue coating groove, wherein the glue coating groove is arranged on the glue-facing side of the back roller, and a glue coating gap is formed between the scraper and the back roller, and the glue coating gap is arranged to allow film material and glue of set thickness to pass through; it includes a glue supply groove, and the coating method is that the film material is driven by the back roller to bring up the coating liquid, and the excess coating liquid is scraped off by the scraper wheel. Since the distance between the scraper and the glue coating groove is large, and there is no control device to control the glue volume in the glue coating groove, the glue supply groove contains more glue. During the transmission, air will be brought in to form bubbles, resulting in more bubbles on the coating surface. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a scraper coating device which can reduce the generation of bubbles. The utility model adopts the following technical solutions:

[0005] A scraper coating device capable of reducing bubble generation is used for coating glue on a film material, comprising a backing roller and a comma scraper, wherein a glue coating gap is provided between the comma scraper and the film material; the scraper coating device further comprises:

[0006] Glue supply component, used to control the glue volume in the glue supply box;

[0007] An adjustment roller, which is arranged at a position upstream of the backing roller in the conveying direction of the film material so as to be suitable for adjusting an input angle of the film material into the gluing gap; and

[0008] A glue supply box, which is arranged on the glue facing side of the back roller;

[0009] Wherein, in the circumferential direction of the back roller, the distance between the contact position A between the glue supply box and the film material and the contact position B between the comma scraper and the film material is defined as the casting stroke, and the length of the casting stroke is 5-10 cm.

[0010] Furthermore, a glue coating space for accommodating glue is formed between the glue supply box and the film material, and an angle between the two is greater than 120° to reduce the glue volume in the glue coating space.

[0011] Furthermore, the glue supply component includes a glue quantity detection sensor, and the glue quantity detection sensor is suitable for detecting the glue liquid stock in the glue supply box.

[0012] Furthermore, the glue supply box includes a bottom plate and two side plates, and the bottom plate, the side plates and the film material together form a glue coating space.

[0013] Furthermore, the side plate has a reflux component.

[0014] Furthermore, the end of the bottom plate has a chamfered surface.

[0015] Furthermore, the chamfered surface is configured to be inclined downward in the opposite direction of the film material transported by the coating device and to be in direct contact with the film material.

[0016] Furthermore, the glue liquid stored in the glue coating space contacts the backing roller through the film material.

[0017] Furthermore, the thickness of the glue coating gap is 0.05-0.5 mm.

[0018] Further, the bottom plate is configured to be inclined downward.

[0019] The beneficial effects of the utility model are:

[0020] (1) The utility model reduces the distance between the scraper and the coating liquid box during the casting stroke and quantitatively controls the glue volume in the coating space through the glue supply component, thereby effectively reducing the contact area between the coating liquid and the contact surface of the back roller, thereby reducing the entry of air and reducing the generation of bubbles.

[0021] (2) The utility model can coordinately control the angle between the glue supply box and the film material and the length of the casting stroke by adjusting the roller, thereby effectively reducing the amount of glue in the glue coating space, thereby reducing the entry of air and reducing the generation of bubbles.

[0022] (3) The end of the bottom plate of the utility model has a beveled surface, and the beveled surface is closely attached to the back roller, which can effectively support the glue in the glue coating space and prevent the glue from leaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a diagram of the internal structure of a blade coating device in the prior art.

[0024] Figure 2 It is a structural diagram of the utility model.

[0025] Figure 3This is the internal structure diagram of the utility model.

[0026] Figure 4 It is an internal side view of the utility model.

[0027] In the figure, 1 is a back roller; 2 is a comma scraper; 3 is a glue coating gap; 4 is a glue supply box; 41 is a bottom plate; 411 is a beveled surface; 42 is a side plate; 5 is an adjustment roller; 6 is a film material; 7 is a glue coating space; 8 is a glue liquid; 9 is a reflow tank; and 10 is a glue supply component. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various configurations. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0029] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Unless otherwise defined, the technical terms or scientific terms used in this patent document should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second" and similar words used in the patent specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantitative limitations, but indicate the existence of at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" cover the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are only used to indicate relative position relationships. When the absolute position of the described object changes, the relative position relationship may also change accordingly. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on this application.

[0030] like Figure 1-4As shown, the utility model discloses a scraper coating device capable of reducing the generation of bubbles, which is used for coating glue 8 on a film material 6, and comprises a backing roller 1 and a comma scraper 2, wherein a glue coating gap 3 is provided between the blade of the comma scraper 2 and the film material 6, and the glue coating gap 3 determines the thickness of the glue coated on the film material 6. The glue coating gap is provided to allow the film material 6 and the glue 8 of a set thickness to pass through, and in the present embodiment, the thickness of the glue coating gap is 0.2 mm. After the film material 6 passes through the glue coating gap, the glue 8 adheres to the film material 6. The scraper coating device also comprises: a glue supply box 4, which is provided on the glue-facing side of the backing roller 1. And an adjustment roller 5, which is provided in the conveying direction of the film material 6, and the adjustment roller 5 is arranged at a position more upstream than the backing roller 1, so as to be suitable for adjusting the size of the input angle of the film material input into the glue coating gap. A glue coating space 7 for containing glue liquid 8 is formed between the glue supply box 4 and the film material 6. The glue liquid 8 stored in the glue coating space 7 contacts the backing roller 1 through the film material 6. Figure 4 As shown, the angle α between the two is greater than 120° to reduce the capacity of the glue 8 in the glue coating space 7. In this embodiment, the angle α between the glue supply box 4 and the film material 6 is 150°. By setting different positions of the adjustment roller 5, the angle between the glue supply box 4 and the film material 6 can be effectively changed to reduce the storage amount of the glue 8 in the glue coating space 7. The scraper coating device also includes a glue supply component 10. In this embodiment, the glue supply component 10 includes a pump and a glue amount detection sensor. The glue amount detection sensor is suitable for detecting the amount of glue 8 in the glue supply box. The glue supply component 10 adopts intelligent control, which senses the amount of glue in the glue supply box 4 through the glue amount detection sensor, and controls the amount of glue delivered to the glue supply box 4 through the pump, so as to control the amount of glue in the glue supply box 4 within an appropriate range. In this embodiment, the larger the angle between the glue supply box 4 and the film material 6, the less the storage amount of the glue 8 in the glue coating space 7 will be, thereby more effectively reducing the air entry and reducing the generation of bubbles.

[0031] like Figure 4 As shown in the figure, the stroke between the glue supply box 4 and the film material 6 starting from the contact position between the glue supply box 4 and the film material and extending along the outer peripheral surface of the back roller 1 to the contact position between the comma scraper 2 and the film material 6 is defined as the casting stroke for the coating glue to be cast under the action of gravity. Figure 4In the figure, the circumferential length extending from point a along the outer circumference of the back roller 1 to point b is the casting stroke. The casting stroke is formed on the glue-facing side of the back roller, and its length is 5-10 cm. In the present embodiment, the length of the casting stroke is 8 cm. It should be noted that the glue-facing side refers to the side of the back roller 1 facing the glue supply box 4, and the film 6 is attached to the back roller 1 on the glue-facing side and coated with glue 8. The casting stroke specifically starts from the contact position between the glue supply box 4 and the back roller 1 and ends at the combination position between the comma scraper 2 and the back roller 1. The distance extending along the outer circumference of the back roller 1 refers to the distance extending in the circumferential direction of the back roller 1. After the glue 8 in the glue supply box 4 adheres to the film 6, it moves upward with the film 6 under the rotation of the back roller 1. During the movement, due to the action of gravity, the glue 8 attached to the film 6 will be cast along the film 6. Different viscosities of glue have different casting properties. The lower the viscosity of the glue, the better the casting property. The thinner and more uniform the thickness of the glue reaching the comma scraper 2 is, and no bubbles will be generated after passing through the comma scraper 2. However, for glue with higher viscosity, the casting property is poor. If the bubbles in the glue are not eliminated in time, streaks will easily be generated on the film material 6 after passing through the comma scraper 2, resulting in defective products. Reducing the casting distance between the glue supply box 4 and the comma scraper 2 can reduce the influence of the glue 8 driven by the back roller 1, and effectively avoid the generation of bubbles on the film material 6.

[0032] like Figure 2 As shown, the glue supply box 4 also includes a bottom plate 41 and two side plates 42. The bottom plate 41, the side plates 42 and the film material 6 together form a glue coating space 7. The material of the bottom plate 41 and the side plates 42 is plastic material to avoid damaging the film material 6. In this embodiment, the material of the bottom plate 41 and the side plates 42 is Teflon. The bottom plate 41 and the side plates 42 are both fitted with the back roller 1. It should be emphasized that, according to the description in the previous part, the fitting setting does not mean that there is no gap, as long as it can ensure that the glue 8 in the glue supply box 4 does not leak out. In addition, the width of the bottom plate between the two side plates 42 can also be adjusted to accommodate film materials 6 of different widths. In order to effectively spread the glue, the bottom plate 41 is configured to be tilted downward and the angle of the bottom plate tilting downward is greater than 20°. As a preferred mode of this embodiment, the two side plates 42 may be provided with a relative reflux component, which can cooperate with the pump to control the glue volume in the glue supply box. If there is too much glue in the glue supply box, the reflux component can be used to adjust the glue volume in the glue coating space. The reflux component is a valve that opens when the reflux groove 9 reaches a threshold.

[0033] like Figure 4As shown, the end of the bottom plate 41 has a chamfered surface 411, which is arranged on the cut surface of the backing roller 1, and the chamfered surface 411 is inclined downward in the opposite direction of the film material 6 transported by the coating device. In this embodiment, the film material 6 is transported in a tensioned state during transportation, and the chamfered surface 411 is closely fitted with the backing roller 1, which can prevent the glue 8 in the glue supply box 4 from leaking from between the film material 6 and the chamfered surface 411. Since the glue 8 has a certain viscosity, it prevents the end of the glue supply box 4 from damaging the film material 6 to be coated.

[0034] It should be noted that the scraper coating device in the present invention is only a component of the coating machine, and other components such as the frame and other devices can adopt the existing technology, which will not be described in detail here.

[0035] The above are only preferred embodiments of the present invention. The protection scope of the present invention shall be based on the scope defined by the claims. Several improvements and modifications made by those skilled in the art without departing from the spirit and scope of the present invention shall also be regarded as the protection scope of the present invention.

Claims

1. A scraper coating device capable of reducing bubble generation, used for coating glue on a film material, comprising a backing roller and a comma scraper, wherein a glue coating gap is provided between the comma scraper and the film material; characterized in that: The blade coating device also includes: Glue supply component, used to control the glue volume in the glue supply box; An adjustment roller, which is arranged at a position upstream of the backing roller in the conveying direction of the film material so as to be suitable for adjusting an input angle of the film material into the gluing gap; and A glue supply box, which is arranged on the glue facing side of the back roller; Wherein, in the circumferential direction of the back roller, the distance between the contact position A between the glue supply box and the film material and the contact position B between the comma scraper and the film material is defined as the casting stroke, and the length of the casting stroke is 5-10 cm.

2. The blade coating device capable of reducing bubble generation according to claim 1, characterized in that: A glue coating space for accommodating glue is formed between the glue supply box and the film material, and an included angle between the two is greater than 120° to reduce the glue volume in the glue coating space.

3. The blade coating device capable of reducing bubble generation according to claim 1 or 2, characterized in that: The glue supply component includes a glue quantity detection sensor, and the glue quantity detection sensor is suitable for detecting the glue liquid stock in the glue supply box.

4. The blade coating device capable of reducing bubble generation according to claim 2, characterized in that: The glue supply box comprises a bottom plate and two side plates, and the bottom plate, the side plates and the film material together form a glue coating space.

5. The blade coating device capable of reducing bubble generation according to claim 4, characterized in that: The side plate has a return flow component.

6. The blade coating device capable of reducing bubble generation according to claim 4, characterized in that: The end of the bottom plate has a chamfered surface.

7. The blade coating device capable of reducing bubble generation according to claim 6, characterized in that: The chamfered surface is configured to be inclined downward in the opposite direction of the film material being transported by the coating device and to be in direct contact with the film material.

8. The blade coating device capable of reducing bubble generation according to claim 2, characterized in that: The glue liquid stored in the glue coating space contacts the backing roller through the film material.

9. The blade coating device capable of reducing bubble generation according to claim 1, characterized in that: The thickness of the glue coating gap is 0.05-0.5 mm.

10. The blade coating device capable of reducing bubble generation according to claim 4, characterized in that: The bottom plate is configured to be inclined downward.

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