A film compounding mechanism

Abstract

The present disclosure relates to the technical field of film compounding, and particularly relates to a film compounding mechanism, which comprises a base material guide roller and a compounding guide roller, further comprises a pressure device, the pressure device comprises at least one pressure unit, the pressure unit is arranged at a film deformation position corresponding to a compounding position of the base material and the film, and the pressure unit is used for cooperating with the compounding guide roller to apply pressure to the film deformation position. The film compounding mechanism provided by the present disclosure realizes flattening of the film deformation position in the film compounding process through the pressure unit capable of cooperating with the compounding guide roller to apply pressure to the film deformation position, improves the product yield, and does not cause product curling.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of film compounding, and particularly relates to a film compounding mechanism. BACKGROUND

[0002] The heat-sensitive paper is a special consumable material for digital integrated speed printing machine, and the production technology of the heat-sensitive paper mainly comprises a compounding process of a glue material, a compounding process of a base material and a film, a coating and drying process, and a slitting process.

[0003] At present, the compounding process of the heat-sensitive paper production is a wet natural compounding technology on a passive guide roller, as shown in Figure 1 The base material 1 and the coated film 2 are pulled down under the traction force and are naturally coincided and bonded together on a passive rotating compounding guide roller 3 without the action of other external pressure.

[0004] Since the coated film 2 is a very thin PET film, generally only about 1.5 microns thick, it is very difficult to achieve very flat flattening quality, and some positions inevitably have deformation phenomena of loose or tight, and these deformation positions of the coated film 2 may have wrinkle defects after compounding.

[0005] In the current heat-sensitive paper compounding technology, in order to solve the above-mentioned wrinkle problem, the way of increasing or decreasing the tension of the coated film 2 is generally adopted, which is effective for some slight deformation, but cannot avoid the wrinkle defect for the slightly serious deformation, so that the yield cannot be guaranteed, and the way of increasing the compounding film tension may also cause the curling phenomenon of the heat-sensitive paper. SUMMARY

[0006] In order to solve the above-mentioned problems, the present disclosure provides a film compounding mechanism.

[0007] Specifically, the technical scheme of the present disclosure is:

[0008] The film compounding mechanism comprises a base material guide roller and a compounding guide roller, and further comprises a pressure device, the pressure device comprises at least one pressure unit, the pressure unit is arranged corresponding to the film deformation position at the compounding position of the base material and the film, and the pressure unit is used for cooperating with the compounding guide roller to apply pressure to the film deformation position.

[0009] In an embodiment, the pressure unit comprises a pressure head, the pressure head is used for directly pressing on the surface of the film deformation position to flatten the film deformation position during compounding.

[0010] In an embodiment, the pressure head is a metal pressure roller, and the axial direction of the pressure head is arranged in parallel with the axial direction of the compounding guide roller.

[0011] In an embodiment, the pressure device further comprises a support, and the pressure unit further comprises a connecting rod, one end of the connecting rod being rotatably connected with the pressure head so that the pressure head is rotatable about the pressure head axis, and the other end of the connecting rod being movably connected with the support along the composite guide roller axis.

[0012] In an embodiment, the support is grounded, and the pressure head, the connecting rod and the support constitute a grounding passage for the electric charge.

[0013] In an embodiment, the pressure head is a cloth bundle.

[0014] In an embodiment, the pressure head is a pressure roller made of a mixture of plastic and anti-static material, and the pressure head axis is parallel to the composite guide roller axis.

[0015] The beneficial technical effects of the present disclosure are as follows:

[0016] The film composite mechanism provided by the present disclosure can exert pressure on the film deformation by the pressure unit capable of cooperating with the composite guide roller, thereby flattening the film deformation during the film composite process, improving the product yield, and avoiding product curling. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic diagram of an existing film composite mechanism;

[0018] Figure 2 FIG. 2 is a structural schematic diagram of a film composite mechanism according to an embodiment of the present disclosure;

[0019] Figure 3 FIG. 3 is a structural schematic diagram of the film composite mechanism shown in FIG. 2; Figure 1 FIG. 4 is a side schematic diagram of the film composite mechanism shown in FIG. 2. DETAILED DESCRIPTION

[0020] The present disclosure will be further described in detail below in conjunction with the drawings and specific embodiments. The following specific embodiments relate to the composite technology of thermal sensitive paper, i.e. the composite of thermal sensitive paper substrate 1 and adhesive film 2. In other embodiments, the film composite mechanism of the present disclosure can also be used to realize the composite of other product substrates and films.

[0021] In a specific embodiment, as shown in FIG. 3, the pressure device comprises a pressure unit 3 and a support 4, and the pressure unit 3 is rotatably connected with the support 4. Figure 2 and 3As shown, the film lamination mechanism provided in this disclosure includes a substrate guide roller 4 and a lamination guide roller 3. Furthermore, compared to existing film lamination mechanisms, this disclosure adds a pressure device, which includes at least one pressure unit 5. The pressure unit 5 is positioned at the film deformation point where the substrate 1 and the coated film 2 are laminated. The pressure unit 5 cooperates with the lamination guide roller 3 to apply pressure to the film deformation point, thereby causing the tension at the deformation point to change and flatten it. The size of the pressure unit 5 is designed to suit the product size. For thermal paper products, the product width is typically between 800cm and 1000cm, and the width of the pressure unit 5 is preferably set between 15cm and 25cm. Three to four pressure units 5 can be prepared to handle situations where the film has multiple deformation points; the number of pressure units 5 can be increased or decreased during the lamination process according to the number of film deformation points.

[0022] Figure 2 The state of setting up two pressure units 5 is shown; see [link / reference]. Figure 2 The pressure unit 5 includes a pressure head 51, which is used to directly press against the surface of the deformed part of the membrane to flatten the deformed part of the membrane during lamination. The material and structure of the pressure head 51 can be selected in various ways. For example, the material can be plastic, metal or cloth, and the structure can be cylindrical or lumpy, depending on the product requirements.

[0023] In this embodiment, the pressure head 51 is a metal roller, which has relatively low friction with the coating film 2, and the static electricity generated by friction is easily discharged. The axial direction of the pressure head 51 is parallel to the axial direction of the composite guide roller 3. The pressure device also includes a support 6, and the pressure unit 5 also includes a connecting rod 52. One end of the connecting rod 52 is rotatably connected to the pressure head 51, allowing the pressure head 51 to rotate around its axis. The other end of the connecting rod 52 is movably connected to the support 6 along the axial direction of the composite guide roller 3. The support 6 is grounded, and the pressure head 51, the connecting rod 52, and the support 6 form a grounding path for charge to pass through. Static electricity generated by the contact friction between the pressure head 51 and the coating film 2 can be discharged through this grounding path, preventing static electricity accumulation and potential safety hazards. The specific structure of the rotatable connection between the pressure head 51 and the connecting rod 52 can be as follows: Figure 2 As shown, other structural forms are also possible; for example, the pressure head 51 may only have one end connected to the connecting rod 52. The structure of the support 6 can be as follows: Figure 2 The diagram shows a rod portion on which a connecting rod 52 is fitted. By appropriately setting the tightness of the fit between the connecting rod 52 and the rod portion, the connecting rod 52 can be prevented from moving axially along the rod portion without additional external force. Furthermore, by appropriately designing the mating structure between the connecting rod 52 and the rod portion, circumferential displacement of the connecting rod 52 relative to the rod portion can be prevented. For example, the rod portion can be designed with an axially limiting protrusion, and the connecting rod 52 can be provided with a corresponding limiting groove. Alternatively, the connecting rod 52 can be locked to the support 6 by a fastener; only after the fastener is released can the connecting rod 52 move relative to the support 6.

[0024] Figure 2 The structure shown is only one of many pressure device structures, and it is difficult to list them all here. The main feature of the pressure device is that it includes at least one pressure unit 5 for applying pressure to the deformed part of the membrane. The structure of the pressure unit 5 is not limited to the several mentioned in this disclosure. The main feature of the pressure unit 5 is that it includes a pressure head 51, which should have the function of flattening the deformed part of the membrane, and should not have sharp parts that would scratch the product.

[0025] In other embodiments, the pressure head 51 can also be a bundle of cloth or a pressure roller made of a mixture of plastic and antistatic materials. When the pressure head 51 is a tightly bundled cloth, it has a very good effect on reducing or avoiding composite wrinkles in thermal paper. However, due to the large surface friction between the cloth and the thermal paper, insufficient reinforcement of the substrate may cause the thermal paper to fuzz, and it will also increase paper fiber residue and scaling, thus requiring more frequent maintenance of the integrated high-speed printer. When the pressure head 51 is a regular plastic pressure roller, it can achieve the effect of reducing or avoiding composite wrinkles in thermal paper. However, when the pressure roller presses on the composite guide roller and is driven to rotate together by the thermal paper, it is easy to generate a lot of static electricity, which may affect safety. Therefore, the pressure roller material needs to incorporate a certain amount of antistatic material to reduce static electricity generation.

[0026] When the pressure head 51 is a metal pressure roller, simply grounding the pressure head 51 using certain methods can greatly reduce static electricity generation. The surface of the metal pressure roller is smooth and will not increase the surface fuzzing of the thermal paper, thus achieving a good effect of reducing or avoiding composite wrinkles in the thermal paper.

[0027] Figure 2 and 3 The thin and thick arrows indicate the rotation direction of the guide roller and the reverse direction of product conveying, respectively. The pressure head 51 is driven to rotate by the friction between itself and the product. Multiple pressure units 5 are installed above the substrate and film lamination area for backup. These units are not needed when the film is flat and undeformed. When film deformation occurs, the pressure units 5 are immediately moved to the corresponding positions to press down, thereby reducing and avoiding lamination wrinkles at these locations, thus improving the yield rate. This disclosure specifically and locally treats film deformation areas, effectively avoiding the problem of product curling caused by excessive film tension in the aforementioned prior art.

[0028] The above description is merely a preferred embodiment of this disclosure and is not intended to limit the scope of this disclosure. It should be noted that any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art within the spirit and principles of this disclosure after reading this specification should be included within the protection scope of this disclosure.

Claims

1. A film laminating mechanism comprising a substrate guide roll and a laminating guide roll for laminating a substrate of a thermal sensitive sheet and a gum film, characterized in that: The pressure device comprises a plurality of pressure units for standby, which are arranged at the film deformation positions corresponding to the composite positions of the base material and the film, and are used to apply pressure to the film deformation positions in cooperation with the composite guide roller; When there is local film deformation, one or more of the pressure units are moved to the corresponding film deformation position to press it down to avoid the film deformation from preventing it from being flattened; The pressure device further comprises a support, which is arranged to be grounded; the pressure unit comprises a pressing head and a connecting rod; the pressing head is a metal roller, and the pressing head, the connecting rod and the support form a grounding path for electricity.

2. The film complexing mechanism of claim 1, wherein: The pressing head is used to directly press against the surface of the film deformation position to flatten the film deformation position during the composite.

3. The film composite of claim 2, wherein: The axial direction of the pressing head is arranged in parallel with the axial direction of the composite guide roller.

4. The film composite of claim 2, wherein: One end of the connecting rod is rotationally connected with the pressing head, so that the pressing head can rotate around the axis of the pressing head; the other end of the connecting rod is movably connected with the support along the axial direction of the composite guide roller.

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