Film winding internal stress self-adaptive mandrel
By using the adaptive mandrel of internal stress in film production equipment, the problem of blasting ribs caused by the inability to release internal stress during film rolling is solved, and the equilibrium state of the film roll is achieved, which improves production efficiency and reduces the loss of film scrapping.
Patent Information
- Application Number
- CN202420878019.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-25
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-04-25
AI Technical Summary
During the rolling process, the internal stress cannot be released due to roll compression, resulting in the film rolling of ribs, which will cause the entire roll of film to be scrapped.
It is provided with a film coiling internal stress adaptive mandrel, including a hollow shaft, a shaped deformation member such as an airbag and a flexible member, such as a flexible shell, which are the same center and are wrapped and arranged in sequence. The shaped deformation member and a flexible member are used to automatically adjust the stress in the film during the coiling process to maintain the balance state of the film coil.
By automatically adjusting the stress in the film, the chance of exploding ribs is reduced, the production efficiency is improved, and the losses caused by film scrapping are reduced.
Smart Images
Figure CN222683958U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of film production equipment, and in particular to a film winding internal stress adaptive mandrel. Background Art
[0002] At present, the film production equipment will slit the produced film mother roll and then rewind it into a film roll of specified width. The quality control index of the mother roll thickness during the film winding process is within the qualified range, and only a few points are thicker or thinner. The core shaft used for winding generally uses a paper hollow shaft. In order to avoid air being wrapped in the film roll during the large slitting and winding process, the film needs to be pressed on the winding film surface to apply pressure to drive out the air. When the film is wound, the film surface is always pressed by the roller, resulting in the internal stress of the film roll cannot be released. As the film is wound, the ribs produced in the thicker part feel harder and have higher protrusions; the ribs produced in the thinner part feel softer, and the ribs are often accompanied by film depressions. In severe cases, the internal stress of the film roll will be loose inside and tight outside. In this way, the entire roll of film can only be scrapped, causing serious losses to the company.
[0003] Therefore, there is an urgent need to provide a film winding internal stress adaptive mandrel to solve the above-mentioned technical problems. Utility Model Content
[0004] Based on this, a film winding internal stress adaptive core shaft is provided, which mainly solves the problem of film ribs being exposed due to the difference in the tightness of the film roll and the fact that in order to avoid air being wrapped in the film roll during the large-scale slitting and winding process, it is necessary to use a roller to press on the winding film surface to expel the air. The pressure applied by the roller causes the internal stress of the film to not be released during the winding process and the film roll to have different tightness, resulting in different film ribs.
[0005] On the one hand, a film winding internal stress adaptive core shaft is provided, which is used in film production equipment. The core shaft includes: a hollow shaft, a deformable part and a flexible part. The flexible part, the deformable part and the hollow shaft are cocentric and wrapped in sequence. When in use, the film roll is wound on the core shaft.
[0006] An optional solution is that the hollow shaft is configured as a nylon hollow shaft.
[0007] An optional solution is that the deformable member is configured as an airbag, and the airbag is inflatable.
[0008] An optional solution is that an inflation valve core is provided on the airbag.
[0009] An optional solution is that the airbag is configured as a rubber airbag.
[0010] An optional solution is that the flexible member includes a flexible shell, and the flexible shell wraps the deformable member so that the deformable member can be deformed between the hollow shaft and the flexible shell.
[0011] An optional solution is that the material of the flexible shell is set to be rubber material.
[0012] Beneficial effects:
[0013] The above-mentioned film winding internal stress adaptive mandrel, the film production equipment is started and operated. When the film winding internal stress adaptive mandrel is winding, the roller presses the outer film and generates pressure F1 on the inner film. At this time, the deformable part on the inner side of the mandrel is subjected to the pressure F1 transmitted by the film and exerts elastic force F2 on the film. F1 and F2 are equal in magnitude and opposite in direction. During the entire winding process, the film roll is always in a state of dynamic balance of internal stress. Compared with the traditional paper hollow shaft, it can automatically provide corresponding reaction force according to the internal stress of the film, so that the internal stress of the film is always in a balanced state during the winding process, which reduces the probability of film rib problems, improves production efficiency, and reduces the loss caused by film scrapping. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 A schematic diagram of a film winding internal stress adaptive mandrel in one embodiment;
[0015] Figure 2 for Figure 1 A magnified view of part A in FIG.
[0016] Figure 3 A schematic cross-sectional view of a film winding internal stress adaptive mandrel in one embodiment;
[0017] Figure 4 Schematic diagram of the occurrence of ribs when rolling up a film on a traditional paper mandrel;
[0018] Figure 5 It is a schematic diagram of eliminating ribs when winding a film using a mandrel with self-adaptive internal stress in one embodiment of the film.
[0019] Figure numerals: 1. hollow shaft; 2. deformable part; 3. flexible part; 4. film roll. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0021] It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present application in a schematic manner, and therefore the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.
[0022] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which this application can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by this application, should still fall within the scope of the technical contents disclosed in this application.
[0023] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.
[0024] At present, the film production equipment cuts the film from the mother roll and then rewinds it into a film roll of specified width, and the core shaft used for winding is generally a paper hollow shaft. The main disadvantage of this structure is that when the film is wound, the roller always presses the film surface tightly, which causes the internal stress of the film roll to not be released, which easily leads to the phenomenon of ribs on the film roll. Once ribs occur, the whole roll of film can only be scrapped, causing serious losses to the company. There is also a method in the prior art to replace the traditional paper hollow shaft with a nylon hollow shaft coated with a layer of foam on the outside, using the elastic characteristics of the foam to provide a certain elastic force, and reduce the impact of excessive internal stress during the winding process. However, due to the limited elasticity of the foam and irregular deformation after deformation, the winding film surface will appear uneven, and the film surface will still have ribs.
[0025] The present application provides a film winding internal stress adaptive mandrel for use in film production equipment, mainly used to solve the problem of rib cracking during the film winding process.
[0026] The following is a detailed description of the film winding internal stress adaptive mandrel provided by the present application. Please refer to Figure 1-Figure 3As shown, it includes: a hollow shaft 1, a deformable member 2 and a flexible member 3, wherein the flexible member 3, the deformable member 2 and the hollow shaft 1 are cocentric and wrapped in sequence; when in use, the film roll 4 is rolled up on the core shaft.
[0027] In this embodiment, a structure consisting of a hollow shaft 1, a deformable part 2 and a flexible part 3 is adopted. During the film winding process, a film with an excessively thick thickness tolerance will compress the area so that the deformable part 2 on the inner side of the film winding internal stress adaptive core shaft will deform inward, and the roller pressing the outer film will generate pressure F1 on the inner film. The deformable part 2 is subjected to the pressure F1 transmitted from the film and exerts an elastic force F2 on the film at the same time. F1 and F2 are equal in magnitude and opposite in direction. Therefore, during the entire winding process, the film roll is always in a state of dynamic balance of internal stress, thereby solving the problem of rib bursting of the film roll.
[0028] In this embodiment, it should be noted that the hollow shaft 1 is configured as a nylon hollow shaft. The use of a nylon hollow shaft can reduce weight, is corrosion-resistant, has high tensile strength, and has a long service life.
[0029] Please continue to refer to Figure 1-Figure 3 As shown, in this embodiment, it should be noted that the deformable part 2 is configured as an airbag, and the airbag can be inflated and deflated. The airbag with inflation and deflation settings can be inflated to the corresponding air pressure according to the film of different thickness specifications, and then the pressure generated on the inner wall of the airbag is equal everywhere without considering the leakage amount. The same pressure is applied to the film through the deformation of the airbag itself to make the film roll surface flat. Preferably, an inflation valve core is provided on the airbag, and the inflation valve core is arranged at the end position of the airbag. Such a setting will not affect the film winding, and the inflation operation of the airbag is facilitated by the setting of the inflation valve core.
[0030] In one example, the airbag is configured as a rubber airbag. Since rubber is relatively soft, a film with an excessively thick thickness tolerance will compress the area and cause the rubber airbag to deform inwards, thereby keeping the film roll flat.
[0031] Please continue to refer to Figure 1-Figure 3 As shown, in this embodiment, it should be noted that the flexible member 3 includes a flexible shell, and the flexible shell wraps the deformable member 2 so that the deformable member 2 can be deformed between the hollow shaft 1 and the flexible shell. On the one hand, the deformable member 2 can be wrapped by the setting of the flexible shell to prevent the deformable member 2 from directly contacting the outside and from being damaged due to bumps during use. On the other hand, the deformable member 2 can only be deformed between the hollow shaft 1 and the flexible shell, ensuring the cylindricality of the film winding internal stress adaptive core shaft.
[0032] In one example, the material of the flexible shell is set to rubber material. Similarly, rubber material is relatively soft, and a film with too thick a thickness tolerance will compress the corresponding area of the flexible shell to deform the rubber airbag inwards and then keep the film roll flat.
[0033] Please refer to Figure 4 , Figure 5 As shown in the figure, the winding state of the film with too thick or too thin film tolerance on the traditional paper hollow shaft and the film internal stress adaptive mandrel is compared. Figure 4 It can be seen that the wall of the traditional paper hollow shaft is relatively hard and will not deform significantly. The film with too thick thickness tolerance will be deformed here ( Figure 4 The phenomenon of ribs being exposed is formed at a point in the figure; Figure 5 It can be seen that the film internal stress adaptive mandrel is a structure composed of a nylon hollow shaft 1, a deformable part 2 such as a rubber airbag and a flexible part 3 such as a flexible shell. Since the rubber material is relatively soft, a film with a thickness tolerance that is too thick will compress this area ( Figure 5 b in the figure) causes the rubber airbag to deform inwards and thus keep the film roll flat. Therefore, compared with the traditional paper hollow shaft, the film winding internal stress adaptive core shaft can automatically provide corresponding reaction force according to the internal stress of the film, so that the internal stress of the film is always in a balanced state during the winding process, reducing the probability of film rib problems, improving production efficiency, and reducing the losses caused by film scrapping.
[0034] The implementation principle of this embodiment is as follows: first, before installing and using the film winding internal stress adaptive mandrel, the inner layer deformable part 2 such as a rubber airbag needs to be inflated to the corresponding air pressure according to the films of different thickness specifications. After installing the film internal stress adaptive mandrel, the film production equipment is started and operated. When the film winding internal stress adaptive mandrel is winding, the outer film is pressed by the roller surface, which will generate pressure F1 on the inner film. The rubber airbag is subjected to the pressure F1 transmitted by the film and exerts an elastic force F2 on the film at the same time. F1 and F2 are equal in magnitude and opposite in direction. During the entire winding process, the film roll is always in a state of dynamic balance of internal stress, which reduces the probability of film rib problems, improves production efficiency, and reduces losses caused by film scrapping.
[0035] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0036] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.
Claims
1. A film winding internal stress adaptive mandrel, characterized in that: Used in a film production device, the core shaft comprises: a hollow shaft (1), a deformable member (2) and a flexible member (3), wherein the flexible member (3), the deformable member (2) and the hollow shaft (1) are cocentric and arranged in sequence; When in use, the film roll (4) is rolled up on the core shaft.
2. The film winding internal stress adaptive mandrel according to claim 1, characterized in that: The hollow shaft (1) is configured as a nylon hollow shaft.
3. The film winding internal stress adaptive mandrel according to claim 1, characterized in that: The deformable member (2) is configured as an airbag, and the airbag can be inflated.
4. The film winding internal stress adaptive mandrel according to claim 3, characterized in that: The air bag is provided with an inflation valve core.
5. The film winding internal stress adaptive mandrel according to claim 3 or 4, characterized in that: The airbag is configured as a rubber airbag.
6. The film winding internal stress adaptive mandrel according to claim 1, characterized in that: The flexible member (3) comprises a flexible shell, wherein the flexible shell wraps the deformable member (2) so that the deformable member (2) is deformed between the hollow shaft (1) and the flexible shell.
7. The film winding internal stress adaptive mandrel according to claim 6, characterized in that: The material of the flexible shell is set to be rubber material.