Foldable magnetic attraction device for door curtain and production process of foldable magnetic attraction device

Abstract

A foldable magnetic device for a door curtain comprises a plastic magnet and an adhesive tape, and is characterized in that one side of the plastic magnet is adhered to the adhesive tape; two symmetrical surfaces of the plastic magnet are provided with grooves (112) which are symmetrical to each other; the production process is characterized by comprising the steps of manufacturing the plastic magnet and pasting the adhesive tape. The plastic magnet is manufactured in the mode that CPE and magnetic powder are mixed and vulcanized, and after vulcanization, the plastic magnet is manufactured through the manufacturing processes of tabletting, multi-layer laminating, cutting, magnetizing, notching and the like. The CPE is chlorinated polyethylene. The door curtain has the beneficial effects that the door curtain can be folded at will, is convenient to store, and can be repeatedly used for multiple times; environmental pollution and production resource waste caused by the fact that door curtains in the prior art cannot be reused are avoided, environmental pollution is reduced, and ecological development is promoted; the softness of the magnetic attraction edge of a curtain product can be improved, the magnetic attraction force is dispersed, the connection attraction force between curtains is moderate, and the service life of the door curtain is prolonged.

Description

Technical Field

[0001] The invention relates to a magnetic attraction device, in particular to a foldable magnetic attraction device for a door curtain and a production process thereof. Background Art

[0002] The magnetic device is used for the movable suction connection between the curtains of the door curtain. Due to the mutual suction effect between the magnetic devices, it is used for the suction connection between the door curtains, so that the door curtains can be opened and closed freely. After opening and closing, the door curtains can be naturally sucked together. It can also prevent the wind from blowing open the curtains when no one passes by, blocking mosquitoes from entering. It makes it convenient for people to enter and exit the room freely, prevents mosquitoes from entering the room, and has the effects of ventilation, air permeability, and light transmission.

[0003] Usually, door curtains are rolled up or folded and stored after autumn and will be used next year. However, when the door curtains are used next year, the magnetic suction device will be stiff, curled and not straight, so that the door curtains cannot be well attracted to each other, and there are folded and convex holes, which makes it easy for mosquitoes to enter the room, so that the door curtains lose their due protective function and are scrapped.

[0004] Every year, a number of door curtains are scrapped throughout the society. The discarded door curtains and plastic magnetic strips will cause environmental pollution and waste of production resources; they cause unnecessary waste to consumers and increase the burden on environmental governance.

[0005] For this reason, researching and manufacturing a foldable and reusable magnetic suction device for door curtain is a very meaningful undertaking.

[0006] In reality, the defects of the magnetic device of the door curtain are: 1. It is not convenient to fold and store, and it cannot be folded flat; it cannot be folded into shape; it cannot be restored to a straight line after artificial strong pressure, the suction does not match, there are gaps in the folding angle, it is irregular and easy to break when folded hard. 2. The door curtain and the magnetic device therein are easy to harden and stiff after strong rolling and hard folding, and cannot be straightened; when repeatedly used, they cannot be hung vertically in a straight line, so that the corresponding door curtains cannot be naturally sucked together, and large loopholes appear, thereby losing the function and performance of the door curtain's natural connection and closure, resulting in the loss of the connection, closing and closing function of the door curtain with the magnetic device installed, and thus being discarded. 3. Abandoned door curtains and plastic magnetic strips will cause environmental pollution and waste of production resources; increase environmental governance costs, bring unnecessary waste to consumers, and make production enterprises cost high and low efficiency. 4. In addition, due to the strong magnetic attraction of environmental governance and environmental governance, the strong force used when opening the door curtain will push the door curtain, thereby affecting the service life of the door curtain. Summary of the invention

[0007] The present invention provides a foldable magnetic attraction device for a door curtain and a production process thereof, which can solve the problems mentioned in the background technology and achieve the purpose of being able to be used repeatedly.

[0008] The technical solution of the present invention to solve the technical problem is: 1. A groove is provided on each of the two mutually symmetrical sides of the magnetic attraction device, and the groove enables the magnetic attraction device to be easily bent, and can be folded and stored multiple times and reused multiple times.

[0009] 2. On the two symmetrical sides of the magnetic device, there are two equally symmetrical grooves, that is, the grooves on one side and the grooves on the symmetrical side are equally symmetrical. The equally symmetrical grooves on the two symmetrical sides can make the plastic magnetic strip easy to bend, so as to achieve the purpose of folding the magnetic device at multiple angles and directions, and can improve the service life of the magnetic device.

[0010] 3. A groove structure is further provided, and the bottom angle of the groove is set to be an arc shape. The arc bottom angle can improve the bending performance and fatigue resistance of the magnetic attraction device, and can increase the service life and the bending angle.

[0011] 4. Further set the groove size. Through research, it is found that when the groove size is small, the bending angle range of the magnetic attraction device is small and it is easy to break; when the groove size is large, the magnetic attraction effect is reduced; according to the data of the research test, the optimal size of the groove is preferably set, which can make the bending angle range of the magnetic attraction device large and the magnetic attraction effect moderate. The straightness of the magnetic attraction device is easy to restore after bending, the performance is stable, and the service life is long.

[0012] The foldable magnetic attraction device for a door curtain of the present invention comprises a plastic magnet and an adhesive tape, one side of the plastic magnet is bonded to the adhesive tape; two mutually symmetrical sides of the plastic magnet are respectively provided with grooves.

[0013] The foldable magnetic attraction device for a door curtain of the present invention comprises a plastic magnet and an adhesive tape, one side of the plastic magnet is bonded to the adhesive tape; two mutually symmetrical sides of the plastic magnet are respectively provided with two equally symmetrical grooves.

[0014] The plastic magnet comprises a plastic magnet block, a plastic magnet rib and a groove; the number of the plastic magnet block, the number of the plastic magnet rib and the number of the groove are N; the plastic magnet block and the plastic magnet rib are connected to form a long chain structure; the two sides of the plastic magnet rib are grooves; the grooves are spaced apart from the plastic magnet block; the plastic magnet block is a rectangular strip-shaped block with a magnetic attraction surface A and a magnetic attraction surface B; the magnetic properties of the magnetic attraction surface A and the magnetic attraction surface B are N and S respectively; and there are a mutually symmetrical attachment surface A and an attachment surface B.

[0015] The plastic magnet comprises a plastic magnet block, a plastic magnet rib and a groove; the number of the plastic magnet block, the number of the plastic magnet rib and the number of the groove are N; the plastic magnet block and the plastic magnet rib are connected to form a long chain structure; the two sides of the plastic magnet rib are mutually symmetrical grooves; the grooves and the plastic magnet block are spaced apart; the plastic magnet block is a rectangular strip-shaped block with a magnetic attraction surface A and a magnetic attraction surface B; the magnetic properties of the magnetic attraction surface A and the magnetic attraction surface B are N and S respectively; and there are mutually symmetrical attachment surfaces A and B.

[0016] The groove comprises a groove bottom surface, a groove width, a groove bottom angle, a groove depth, and a groove opening angle; the groove is characterized in that the groove bottom surface is a plane, the groove bottom angle is an arc, and the groove opening angle is a right angle.

[0017] The arc-shaped bottom angle of the groove and the flat bottom surface of the groove facilitate the bending of the plastic magnet, and it is not easy to produce cracks due to bending movement. It will not break after repeated bending, so that the folding performance is flexible and the shape is easy to restore when flattened. It can meet the needs of frequent folding, long-term storage, and frequent restoration of flatness, and has a long service life.

[0018] The right angle of the notch is conducive to the attraction and fit of the plastic magnets and the small gap.

[0019] Furthermore, the depth of the groove is 0.3-0.48 times the width of the plastic magnet; the proper ratio of the groove depth to the plastic magnet width enables the plastic magnet to bend freely, not easily break, and have a certain magnetic attraction.

[0020] Furthermore, the depth of the groove is 1.5-15 mm; the width of the groove is 4-40 mm.

[0021] Furthermore, the groove width is 3-15 times the groove depth; its function is that the appropriate ratio of the groove width to the groove depth can make the bending angle of the plastic magnet moderate, flexible to bend, and not easy to break.

[0022] The production process of a foldable magnetic attraction device (1) for a door curtain comprises the production of a plastic magnet (11) and the pasting of an adhesive tape (12); the production process of the plastic magnet is as follows: the plastic magnet is vulcanized by mixing CPE and magnetic powder, and after vulcanization, it is produced by a manufacturing process such as sheet pressing, multi-layer lamination, cutting, grooving, pasting of adhesive tape, and magnetization; the CPE is chlorinated polyethylene.

[0023] The production process steps are as follows: process step 1, CPE and magnetic powder are mixed and vulcanized, the mass ratio of CPE and magnetic powder is: CPE 5-25 parts, magnetic powder 75-95 parts, vulcanization temperature 100-145 degrees; vulcanization time is 10-20 minutes, and the vulcanized magnetic plastic shape is a rectangular square sheet with a thickness of 2-10mm.

[0024] Process step 2: The vulcanized magnetic plastic rectangular sheet is pressed by a roller press, the roller press pressure is 3-10mp, the roller temperature is 40-80 degrees, the roller speed is 5-20 meters per minute, the ambient temperature is 5-30 degrees, and the thickness of the magnetic plastic rectangular sheet after rolling is 0.5-3mm.

[0025] Process step three: stack the rolled magnetic plastic rectangular sheet in multiple layers, with the number of stacking layers being 2-16 layers; the hydraulic press pressure is 5-15mp, the die temperature is 70-90 degrees, and the ambient temperature is 5-30 degrees; the thickness of the stacked magnetic plastic rectangular sheet is 2-15mm.

[0026] Process step 4: cutting the laminated magnetic plastic rectangular sheets into long strip-shaped plastic magnets, the width of the long strip-shaped plastic magnets is 3-30 mm; the thickness of the plastic magnets is 2-18 mm; the length of the plastic magnets is unlimited, and plastic magnets of any length can be made according to needs and uses.

[0027] Process step five: putting the plastic magnet into a punching machine and a mold to punch a groove. The shape characteristics of the groove of the plastic magnet after punching are: the groove bottom surface is a plane, the groove bottom angle is an arc, and the groove opening angle is a right angle.

[0028] Process step six: placing the plastic magnet with the grooves punched into a magnetizer for magnetization, and the plastic magnet is manufactured.

[0029] The manufactured plastic magnet is in the shape of an elongated strip, the groove depth of the groove is 1.5-15 mm; the groove width of the groove of the plastic magnet is 4-40 mm; the spacing between the grooves on a single side of the plastic magnet is 1-30 times the groove width; the number of the grooves on a single side of the plastic magnet is N.

[0030] Process step seven: stick an adhesive tape on the attachment surface A of the manufactured plastic magnet, or stick an adhesive tape on the attachment surface B of the manufactured plastic magnet.

[0031] The plastic magnet attached with adhesive tape is a foldable magnetic attraction device for door curtain of the present invention.

[0032] The beneficial effects of the present invention are: when the door curtain is reused, it can be easily and naturally aligned vertically, and the door curtain can restore its original connection, closure and closing performance, so that the door curtain can be folded arbitrarily, is easy to store, and can be reused and reused many times; it avoids the environmental pollution and waste of resources caused by the disposal of the door curtain in the prior art due to non-reusability, can save expenses for consumers and families, increase competitive advantages for production enterprises, bring better economic benefits, reduce environmental pollution, and promote ecological development.

[0033] The present invention also has the beneficial effects of increasing the softness of the magnetic edge of the curtain, making it flexible to open and lower the curtain; dispersing the magnetic attraction force, making the connection attraction between the curtains moderate, making it easy to open the curtain without using great force, thus avoiding damage to the curtain due to excessive force, thereby increasing the service life of the curtain and the door curtain. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural diagram of the magnetic attraction device of the present invention, including its Z-direction top view.

[0035] Figure 2 for Figure 1 AA section view.

[0036] Figure 3 for Figure 1 BB section view.

[0037] Figure 4 This is a structural diagram of the plastic magnet of the magnetic attraction device, including its Z-direction top view.

[0038] Figure 5 for Figure 4 CC section view.

[0039] Figure 6 for Figure 4 DD section view.

[0040] Figure 7 for Figure 4 Enlarged view of part I.

[0041] Figure 8 This is a diagram of various groove structures of plastic magnets.

[0042] Fig. 9 for Figure 8 Enlarged view of part II.

[0043] Fig.10 It is a mutual magnetic attraction principle and bending schematic diagram of the magnetic attraction device, including an EE-direction cross-sectional view, an FF-direction cross-sectional view, and a bending virtual schematic diagram.

[0044] Fig.11 This is a schematic diagram of the application of the magnetic suction device on a single door curtain, including a cross-sectional view in the HH direction and a cross-sectional view in the LL direction.

[0045] Fig.12 This is a schematic diagram of the application of the magnetic device on the double door curtain, including a cross-sectional view in the GG direction and a cross-sectional view in the KK direction.

[0046] Fig.13 The present invention is a production process diagram of a foldable magnetic device for a door curtain. Fig.13 Attached is the abstract.

[0047] In the figure, 1. a foldable magnetic device for a door curtain; 11. a plastic magnet; 12. an adhesive tape; 112. a groove; 111. a plastic magnetic block; 111T. a plastic magnetic rib; 11b. a plastic magnetic strip width; N. magnetic N; S. magnetic S.

[0048] In the figure, 113A. Magnetic surface A; 113B. Magnetic surface B; 114A. Attachment surface A; 114B. Attachment surface B.

[0049] In the figure, 18. door curtain; 181. magnetic soft cover on the curtain edge; 182. curtain body.

[0050] In the figure, 112a is the bottom surface of the groove; 112b is the groove width; 112r is the bottom angle of the groove; 112d is the groove depth; 112Ak is the groove mouth angle.

[0051] In the figure, 112T. Flat-bottom right-angle groove; 112R. Full-arc angle groove; 112K. Oblique-bottom angle groove; 112X. Trapezoidal groove.

[0052] In the figure, 112Ra is the groove bottom surface R; 112Rb is the groove width R; 112Rr is the groove bottom angle R; 112Rd is the groove depth R; 112RAk is the groove mouth angle R.

[0053] In the figure, S1. bending direction is right; S2. bending direction is left. DETAILED DESCRIPTION

[0054] The present invention is further described below with reference to the accompanying drawings and embodiments.

[0055] Embodiment 1.

[0056] exist Figure 1 , Figure 2 , Figure 3 A foldable magnetic attraction device (1) for a door curtain comprises a plastic magnet (11) and an adhesive tape (12), wherein one side of the plastic magnet (11) is bonded to the adhesive tape (12); and two mutually symmetrical sides of the plastic magnet (11) are each provided with a groove (112).

[0057] exist Figure 4 , Figure 5 , Figure 6 The plastic magnet (11) comprises a plastic magnet block (111), a plastic magnet rib (111T), and a groove (112); the plurality of plastic magnet blocks (111) and the plurality of plastic magnet ribs (111T) are connected at intervals to form a long chain; the two side surfaces of the plastic magnet rib (111T) are provided with grooves (112); the plastic magnet block (111) is a rectangular bar-shaped block, having a magnetic attraction surface A (113A) and a magnetic attraction surface B (113B); and having an attachment surface A (114A) and an attachment surface B (114B).

[0058] exist Figure 7 The groove (112) comprises a groove bottom surface (112a), a groove width (112b), a groove bottom angle (112r), a groove depth (112d), and a groove opening angle (112Ak); the groove (112) is characterized in that the groove bottom surface (112a) is a plane, the groove bottom angle (112r) is an arc, and the groove opening angle (112Ak) is a right angle; 11b is the width of the plastic magnet (11).

[0059] The arc-shaped groove bottom angle (112r) and the flat groove bottom surface (112a) facilitate the bending of the plastic magnet (11), and are not prone to cracks due to bending movements, and will not break after repeated bending, thereby making the folding performance flexible and the shape easy to restore when flattened, meeting the needs of frequent folding, long-term storage, and frequent restoration of flatness, and having a long service life.

[0060] The notch angle (112Ak) being a right angle has the effect of facilitating the plastic magnets (11) to fit together and to reduce the gap.

[0061] Furthermore, the groove depth (112d) is 0.3-0.48 times the width of the plastic magnet (11). The effect of the appropriate ratio of the groove depth to the plastic magnet width is that the appropriate ratio of the groove depth (112d) to the plastic magnet width (11) enables the plastic magnet (11) to bend freely, not easily broken, and still have a certain magnetic attraction.

[0062] Furthermore, the groove depth (112d) is 1.5-15 mm.

[0063] Furthermore, the groove width (112b) is 3-15 times the groove depth (112d); its function is that the appropriate size ratio of the groove width (112b) to the groove depth (112d) can make the bending angle of the plastic magnet (11) moderate, bend flexibly, and not easily break.

[0064] Furthermore, the groove width (112b) is 4-40 mm.

[0065] exist Fig.10In the invention, a foldable magnetic attraction device (1) for a door curtain and a foldable magnetic attraction device (1) for a door curtain are attracted together under the action of magnetic attraction. When S1 is bent, one of the foldable magnetic attraction devices (1) for a door curtain can be bent easily and arbitrarily due to the action of the grooves (112) on both sides. When S2 is bent to return to the original position, due to the action of the grooves (112) on both sides of the foldable magnetic attraction device (1), the foldable magnetic attraction device (1) for a door curtain can be easily and arbitrarily restored to a straight state and can be attracted to the other foldable magnetic attraction device (1) for a door curtain freely and closely without any attraction gap. Furthermore, due to the action of the adhesive tape (12), the foldable magnetic attraction device (1) for a door curtain can be repeatedly folded and straightened without breaking.

[0066] exist Fig.10 In the EE-direction cross-sectional view, two foldable magnetic devices for door curtains (1) are attracted together, and one side of the plastic magnetic rib (111T) of the plastic magnet (11) of the foldable magnetic device for door curtains (1) is connected to the adhesive tape (12); grooves (112) are respectively provided on both sides of the plastic magnetic rib (111T); due to the effect of the grooves (112) on both sides, the foldable magnetic device for door curtains (1) can be bent freely and restored to its original straight strip freely; the adhesive tape (12) plays an auxiliary role in enhancing the flexible connection effect and anti-fracture effect of the present invention (1), and can prevent fracture caused by repeated bending, thereby enhancing the yield strength of the present invention, enhancing the fatigue resistance of the present invention (1), and prolonging the bending service life of the present invention (1).

[0067] exist Fig.10 In the FF cross-sectional view, two foldable magnetic devices (1) for door curtains are attracted together, and one side of the plastic magnetic block (111) of the foldable magnetic device (1) for door curtains is connected to the adhesive tape (12); the plastic magnetic blocks (111) of the two foldable magnetic devices (1) for door curtains are magnetically connected to each other.

[0068] Said Fig.10In the invention, a foldable magnetic attraction device (1) for a door curtain and a foldable magnetic attraction device (1) for a door curtain are attracted together under the action of magnetic attraction, wherein the foldable magnetic attraction device (1) for a door curtain has N plastic magnetic blocks (111), N grooves (112), and N plastic magnetic ribs (111T); the plastic magnetic blocks (111) and the plastic magnetic ribs (111T) are distributed at intervals on an adhesive tape (12) of the foldable magnetic attraction device (1) for a door curtain, and due to the action of the grooves (112) on both sides of the plastic magnetic ribs (111T), the invention (1) has a flexible property that can be bent and straightened freely, so that when two inventions (1) are used in parallel, the mutual magnetic attraction force is good, and each can be bent freely, so that they can be attracted and fitted together in a mutually bent and parallel state, and can be easily separated and combined, which is very suitable for the needs of flexible suction connection between curtains.

[0069] Said Fig.11 In the door curtain (18), a foldable magnetic attraction device (1) for a door curtain is installed in the door curtain (18), and the door curtain (18) comprises a curtain edge magnetic soft cover (181), a curtain body (182), and a foldable magnetic attraction device (1) for a door curtain; the curtain edge magnetic soft cover (181) wraps the foldable magnetic attraction device (1) for a door curtain and is connected to the curtain body (182); one side of the curtain body (182) is connected to the magnetic soft cover (181); the magnetic soft cover (181) wraps the foldable magnetic attraction device (1) for a door curtain.

[0070] exist Fig.11 In the HH sectional view, the door curtain (18) comprises a curtain edge magnetic soft cover (181), a curtain body (182), and a foldable magnetic attraction device (1) for a door curtain; the foldable magnetic attraction device (1) for a door curtain comprises an adhesive tape (12), a plastic magnetic rib (111T) of a plastic magnet (11), one side of the plastic magnetic rib (111T) of the plastic magnet (11) is bonded to the adhesive tape (12); and grooves (112) are provided on both sides of the plastic magnetic rib (111T).

[0071] exist Fig.11 In the LL sectional view, the door curtain (18) comprises a curtain edge magnetic soft cover (181), a curtain body (182), and a foldable magnetic attraction device (1) for a door curtain; the foldable magnetic attraction device (1) for a door curtain comprises an adhesive tape (12), a plastic magnetic block (111) of a plastic magnet (11), and one side of the plastic magnetic block (111) of the plastic magnet (11) is connected to the adhesive tape (12). The magnetic soft cover (181) wraps the plastic magnetic block (111) of the plastic magnet (11) of the foldable magnetic attraction device (1) for a door curtain with the adhesive tape (12) and is connected to one side of the curtain body (182).

[0072] exist Fig.12In the embodiment, the two door curtains (18) are placed together and are closely connected by the magnetic attraction of a foldable magnetic attraction device (1) for a door curtain; the door curtain (18) comprises a curtain edge magnetic soft cover (181), a curtain body (182), and a foldable magnetic attraction device (1) for a door curtain; one side of the curtain body (182) is connected to the magnetic soft cover (181); the magnetic soft cover (181) contains a foldable magnetic attraction device (1) for a door curtain, and the symmetrical sides of the foldable magnetic attraction device (1) for a door curtain are Each of the two foldable magnetic devices (112) is provided with a groove (112). Due to the effect of the grooves (112) on both sides of the foldable magnetic device (1) for a door curtain, the door curtain (18) can be naturally vertical when hung for use, and can be freely attracted to each other and connected. When the curtain is lifted, it can be easily opened. When the curtain is put down, the door curtain (18) and the door curtain (18) can be quickly and naturally attracted to each other, and the seam is perfect without leakage. When the door curtain (18) is not used and is stored, it can be folded and bent freely. When the door curtain (18) is hung again for use, it can easily return to its original shape, be vertical freely, attract each other naturally to form a line, and be connected without leakage.

[0073] exist Fig.12 In the GG cross-sectional view, the two door curtains (18) are together, and are closely connected due to the magnetic attraction of the plastic magnetic block (111) of the plastic magnet (11) of a foldable magnetic attraction device (1) for the door curtain; the characteristic is that: the magnetic soft cover (181) wraps a foldable magnetic attraction device (1) for the door curtain around the curtain body (182), and one side of the plastic magnetic block (111) of the plastic magnet (11) of the foldable magnetic attraction device (1) for the door curtain is connected to the adhesive tape (12); the plastic magnetic blocks (111) in the magnetic soft cover (181) of the two door curtains (18) are magnetically attracted to each other, so as to play the role of movably connecting the door curtains (18) and the door curtains (18).

[0074] exist Fig.12In the KK sectional view, two door curtains (18) are put together, and the magnetic soft cover (181) of the door curtain (18) wraps the plastic magnetic ribs (111T) and adhesive tape (12) of the plastic magnet (11) of the foldable magnetic attraction device (1) for the door curtain and is connected to the curtain body (182); the characteristic is that grooves (112) are formed on both sides of the plastic magnetic ribs (111T) and the inner periphery of the magnetic soft cover (181); the grooves (112) play the role of spacing the magnetic attraction force and providing the plastic magnet (11) with a bending space. The function of the door curtain (18) is to make the suction force between the door curtains (18) moderate, so that the curtains can be opened easily and quickly, and the curtains can be bent naturally and smoothly when they are lifted, and can be easily restored to linear suction when they are put down; in particular, it is convenient for the door curtain (18) to be folded for storage and to be restored linearly when it is reused, which can improve the performance of the door curtain (18) and the value of repeated use, so that the present invention (1) has the beneficial effects of saving production resources, reducing environmental pollution, and improving the efficiency and value of the use of the door curtain (18).

[0075] exist Fig.13 In the invention, the production process of the foldable magnetic attraction device (1) for a door curtain comprises the production of a plastic magnet (11) and the attachment of an adhesive tape (12).

[0076] The manufacturing process of the plastic magnet (11) is as follows: the plastic magnet (11) is vulcanized by mixing CPE and magnetic powder, and after vulcanization, it is manufactured through manufacturing processes such as sheet pressing, multi-layer lamination, cutting, grooving, pasting adhesive tape (12), and magnetization; the CPE is chlorinated polyethylene.

[0077] The production process steps of the foldable magnetic attraction device (1) for door curtains are as follows: process step 1, CPE and magnetic powder are mixed and vulcanized, the mass ratio of CPE and magnetic powder is: CPE 5-25 parts, magnetic powder 75-95 parts, vulcanization temperature is 100-145 degrees; vulcanization time is 10-20 minutes, and the vulcanized magnetic plastic shape is a rectangular square sheet with a thickness of 2-10mm.

[0078] Process step 2: The vulcanized magnetic plastic rectangular sheet is pressed by a roller press, the roller press pressure is 3-10mp, the roller temperature is 40-80 degrees, the roller speed is 5-20 meters per minute, the ambient temperature is 5-30 degrees, and the thickness of the magnetic plastic rectangular sheet after rolling is 0.5-3mm.

[0079] Process step three: stack the rolled magnetic plastic rectangular sheet in multiple layers, with the number of stacking layers being 2-12 layers; the die temperature is 70-90 degrees, and the ambient temperature is 5-30 degrees; the thickness of the stacked magnetic plastic rectangular sheet is 2-15mm.

[0080] Process step 4: cutting the laminated magnetic plastic rectangular sheet into long strip-shaped plastic magnets, wherein the width of the long strip-shaped plastic magnets is 3-30 mm; the thickness of the long strip-shaped plastic magnets is 2-15 mm; the length of the plastic magnets (11) is unlimited, and long strip-shaped plastic magnets of any length can be produced according to needs and uses.

[0081] Process step five: placing the cut long strip plastic magnet into a punching machine and a mold to punch out a plastic magnet (11) with a groove (112), wherein the characteristics after punching are as follows: the plastic magnet (11) has grooves (112) on two symmetrical sides, the groove bottom surface (112a) of the groove (112) is a plane, the groove bottom angle (112r) is an arc, and the groove opening angle (112Ak) is a right angle; the groove depth of the groove (112) is 1.5-15 mm; the groove width of the groove (112) of the plastic magnet (11) is 4-40 mm; the spacing between the grooves (112) on one side of the plastic magnet (11) is 1-30 times the size of the groove width (112b); and the number of the grooves (112) on one side of the plastic magnet (11) is N.

[0082] Process step six: placing the plastic magnet (11) punched with the groove (112) into a magnetizer for magnetization.

[0083] Process step seven: affixing an adhesive tape (12) to the attachment surface A (114A) of the magnetized plastic magnet (11); that is, affixing the adhesive tape (12) to one side of the manufactured plastic magnet (11); the adhesive tape (12) is preferably a cloth-based tape.

[0084] The plastic magnet (11) is attached with an adhesive tape (12), thus forming a foldable magnetic attraction device (1) for a door curtain of the present invention.

[0085] The foldable magnetic device (1) for a door curtain produced by the production process is used for the magnetic movable connection of a door curtain.

[0086] Embodiment 2.

[0087] exist Figure 1 , Figure 2 , Figure 3 A foldable magnetic attraction device (1) for a door curtain comprises a plastic magnet (11) and an adhesive tape (12), wherein one side of the plastic magnet (11) is bonded to the adhesive tape (12); and mutually symmetrical grooves (112) are provided on two mutually symmetrical sides of the plastic magnet (11).

[0088] exist Figure 4 , Figure 5 , Figure 6The plastic magnet (11) comprises a plastic magnet block (111), a plastic magnet rib (111T), and a groove (112); the plurality of plastic magnet blocks (111) and the plurality of plastic magnet ribs (111T) are connected at intervals to form a long chain; the two side surfaces of the plastic magnet rib (111T) are provided with grooves (112) that are symmetrical to each other; the plastic magnet block (111) is a rectangular bar-shaped block, having a magnetic attraction surface A (113A) and a magnetic attraction surface B (113B); and having an attachment surface A (114A) and an attachment surface B (114B).

[0089] exist Figure 7 The groove (112) comprises a groove bottom surface (112a), a groove width (112b), a groove bottom angle (112r), a groove depth (112d), and a groove opening angle (112Ak); the groove (112) is characterized in that the groove bottom surface (112a) is a plane, the groove bottom angle (112r) is an arc, and the groove opening angle (112Ak) is a right angle; 11b is the width of the plastic magnet (11).

[0090] The arc-shaped groove bottom angle (112r) and the flat groove bottom surface (112a) facilitate the bending of the plastic magnet (11), and are not prone to cracks due to bending movements, and will not break after repeated bending, thereby making the folding performance flexible and the shape easy to restore when flattened, meeting the needs of frequent folding, long-term storage, and frequent restoration of flatness, and having a long service life.

[0091] The notch angle (112Ak) being a right angle has the effect of facilitating the plastic magnets (11) to fit together and to reduce the gap.

[0092] Furthermore, the groove depth (112d) is 0.3-0.48 times the width of the plastic magnet (11). The effect of the appropriate ratio of the groove depth to the plastic magnet width is that the appropriate ratio of the groove depth (112d) to the plastic magnet width (11) enables the plastic magnet (11) to bend freely, not easily broken, and still have a certain magnetic attraction.

[0093] Furthermore, the groove depth (112d) is 1.5-15 mm.

[0094] Furthermore, the groove width (112b) is 3-15 times the groove depth (112d); its function is that the appropriate size ratio of the groove width (112b) to the groove depth (112d) can make the bending angle of the plastic magnet (11) moderate, bend flexibly, and not easily break.

[0095] Furthermore, the groove width (112b) is 4-40 mm.

[0096] exist Fig.10In the invention, a foldable magnetic attraction device (1) for a door curtain and a foldable magnetic attraction device (1) for a door curtain are attracted together under the action of magnetic attraction. When S1 is bent, one of the foldable magnetic attraction devices (1) for a door curtain can be bent easily and arbitrarily due to the action of the mutually equilateral grooves (112) on both sides. When S2 is bent in the reset direction, due to the action of the mutually equilateral grooves (112) on both sides of the foldable magnetic attraction device (1), the foldable magnetic attraction device (1) for a door curtain can be easily and arbitrarily restored to a straight state and can be attracted to the other foldable magnetic attraction device (1) for a door curtain freely and closely without any attraction gap. Furthermore, due to the action of the adhesive tape (12), the foldable magnetic attraction device (1) for a door curtain can be repeatedly folded and straightened without breaking.

[0097] exist Fig.10 In the EE-direction cross-sectional view, two foldable magnetic devices for door curtains (1) are attracted together, and one side of the plastic magnetic rib (111T) of the plastic magnet (11) of the foldable magnetic device for door curtains (1) is connected to the adhesive tape (12); the two sides of the plastic magnetic rib (111T) are respectively provided with mutually symmetrical grooves (112); due to the effect of the symmetrical grooves (112) on both sides, the foldable magnetic device for door curtains (1) can be bent freely and restored to its original straight strip freely, and the adhesive tape (12) plays an auxiliary role in enhancing the flexible connection effect and anti-fracture effect of the foldable magnetic device for door curtains (1), and can prevent fracture caused by repeated bending, thereby enhancing the yield strength of the present invention (1), enhancing the fatigue resistance of the present invention (1), and prolonging the bending service life of the present invention (1).

[0098] exist Fig.10 In the FF cross-sectional view, two foldable magnetic devices (1) for door curtains are attracted together, and one side of the plastic magnetic block (111) of the foldable magnetic device (1) for door curtains is connected to the adhesive tape (12); the plastic magnetic blocks (111) of the two foldable magnetic devices (1) for door curtains are magnetically connected to each other.

[0099] Said Fig.10In the invention, a foldable magnetic attraction device (1) for a door curtain and a foldable magnetic attraction device (1) for a door curtain are attracted together under the action of magnetic attraction, wherein the foldable magnetic attraction device (1) for a door curtain has N plastic magnetic blocks (111), N grooves (112), and N plastic magnetic ribs (111T); the plastic magnetic blocks (111) and the plastic magnetic ribs (111T) are distributed at intervals on an adhesive tape (12) of the foldable magnetic attraction device (1) for a door curtain, and due to the action of the grooves (112) on both sides of the plastic magnetic ribs (111T), the foldable magnetic attraction device (1) for a door curtain has a flexible property that can be bent and straightened freely, so that when the two foldable magnetic attraction devices (1) for a door curtain are used in parallel, the mutual magnetic attraction force is good, and each can be bent freely, so that they can be attracted and fitted together in a mutually bent and parallel state, and can be easily separated and combined, which is very suitable for the needs of flexible suction connection between curtains.

[0100] Said Fig.11 In the door curtain (18), a foldable magnetic attraction device (1) for a door curtain is installed in the door curtain (18), and the door curtain (18) comprises a curtain edge magnetic soft cover (181), a curtain body (182), and a foldable magnetic attraction device (1) for a door curtain; the curtain edge magnetic soft cover (181) wraps the foldable magnetic attraction device (1) for a door curtain and is connected to the curtain body (182); one side of the curtain body (182) is connected to the magnetic soft cover (181); the magnetic soft cover (181) wraps the foldable magnetic attraction device (1) for a door curtain.

[0101] exist Fig.11 In the HH sectional view, the door curtain (18) comprises a curtain edge magnetic soft cover (181), a curtain body (182), and a foldable magnetic attraction device (1) for the door curtain; the foldable magnetic attraction device (1) for the door curtain comprises an adhesive tape (12), a plastic magnetic rib (111T) of a plastic magnet (11), one side of the plastic magnetic rib (111T) of the plastic magnet (11) is bonded to the adhesive tape (12); and the two sides of the plastic magnetic rib (111T) are provided with mutually symmetrical grooves (112).

[0102] exist Fig.11 In the LL sectional view, the door curtain (18) comprises a curtain edge magnetic soft cover (181), a curtain body (182), and a foldable magnetic attraction device (1) for a door curtain; the foldable magnetic attraction device (1) for a door curtain comprises an adhesive tape (12), a plastic magnetic block (111) of a plastic magnet (11), and one side of the plastic magnetic block (111) of the plastic magnet (11) is connected to the adhesive tape (12). The magnetic soft cover (181) wraps the plastic magnetic block (111) of the plastic magnet (11) of the foldable magnetic attraction device (1) for a door curtain with the adhesive tape (12) and is connected to one side of the curtain body (182).

[0103] exist Fig.12In the embodiment, the two door curtains (18) are placed together and are closely connected by the magnetic attraction of a foldable magnetic attraction device (1) for a door curtain; the door curtain (18) comprises a curtain edge magnetic soft cover (181), a curtain body (182), and a foldable magnetic attraction device (1) for a door curtain; one side of the curtain body (182) is connected to the magnetic soft cover (181); the magnetic soft cover (181) contains a foldable magnetic attraction device (1) for a door curtain, and the foldable magnetic attraction device (1) for a door curtain has two mutually symmetrical sides provided with The grooves (112) are symmetrical to each other. Due to the symmetrical grooves (112) on both sides of the foldable magnetic device (1) for a door curtain, the door curtain (18) can be naturally vertical when hung and used, and can be attracted to each other freely and connected. When the curtain is lifted, it can be easily opened. When the curtain is put down, the door curtain (18) can be quickly and naturally attracted to each other, and the seam is perfect without leakage. When the door curtain (18) is not used and is stored, it can be folded freely. When the door curtain (18) is hung again for use, it can return to its original shape, be vertical freely, attract each other naturally to form a line, and be connected without leakage.

[0104] exist Fig.12 In the GG cross-sectional view, the two door curtains (18) are together, and are closely connected due to the magnetic attraction of the plastic magnetic block (111) of the plastic magnet (11) of a foldable magnetic attraction device (1) for the door curtain; the characteristic is that: the magnetic soft cover (181) wraps a foldable magnetic attraction device (1) for the door curtain around the curtain body (182), and one side of the plastic magnetic block (111) of the plastic magnet (11) of the foldable magnetic attraction device (1) for the door curtain is connected to the adhesive tape (12); the plastic magnetic blocks (111) in the magnetic soft cover (181) of the two door curtains (18) are magnetically attracted to each other, so as to play the role of movably connecting the door curtains (18) and the door curtains (18).

[0105] exist Fig.12In the KK sectional view, two door curtains (18) are put together, and the magnetic soft cover (181) of the door curtain (18) wraps the plastic magnetic ribs (111T) and adhesive tape (12) of the plastic magnet (11) of the foldable magnetic attraction device (1) for the door curtain and is connected to the curtain body (182); the characteristic is that: mutually symmetrical grooves (112) are provided on both sides of the plastic magnetic ribs (111T) and the inner periphery of the magnetic soft cover (181); the mutually symmetrical grooves (112) play the role of spacing the magnetic attraction force and providing the plastic magnet ( 11) The function of the bending space; thus, the suction force between the door curtains (18) and the door curtains (18) is moderate, so that the curtains can be opened easily and quickly, and the bending is natural and smooth when the curtains are lifted, and the linear suction can be easily restored when the curtains are put down; in particular, it is convenient for the door curtains (18) to be folded for storage and to be restored linearly when they are reused, which can improve the performance of the door curtains (18) and the value of repeated use, so that the present invention can save production resources, reduce environmental pollution, and improve the efficiency and value of the use of the door curtains (18).

[0106] exist Fig.13 In the invention, the production process of the foldable magnetic attraction device (1) for a door curtain comprises the production of a plastic magnet (11) and the attachment of an adhesive tape (12).

[0107] The manufacturing process of the plastic magnet (11) is as follows: The plastic magnet (11) is made by vulcanizing a mixture of CPE and magnetic powder, and then undergoing manufacturing processes such as sheet pressing, multi-layer lamination, cutting, magnetizing, and slotting after vulcanization; the CPE is chlorinated polyethylene.

[0108] The production process steps of the foldable magnetic attraction device (1) for door curtains are as follows: process step 1, CPE and magnetic powder are mixed and vulcanized, the mass ratio of CPE and magnetic powder is: CPE 5-25 parts, magnetic powder 75-95 parts, vulcanization temperature is 100-145 degrees; vulcanization time is 10-20 minutes, and the vulcanized magnetic plastic shape is a rectangular square sheet with a thickness of 2-10mm.

[0109] Process step 2: The vulcanized magnetic plastic rectangular sheet is pressed by a roller press, the roller press pressure is 3-10mp, the roller temperature is 40-80 degrees, the roller speed is 5-20 meters per minute, the ambient temperature is 5-30 degrees, and the thickness of the magnetic plastic rectangular sheet after rolling is 0.5-3mm.

[0110] Process step three: stack the rolled magnetic plastic rectangular sheet in multiple layers, with the number of stacking layers being 2-12 layers; the die temperature is 70-90 degrees, and the ambient temperature is 5-30 degrees; the thickness of the stacked magnetic plastic rectangular sheet is 2-15mm.

[0111] Process step 4: cutting the laminated magnetic plastic rectangular sheets into long strip-shaped plastic magnets, the width of the long strip-shaped plastic magnets is 3-30 mm; the thickness of the long strip-shaped plastic magnets is 2-15 mm; the length of the long strip-shaped plastic magnets is unlimited, and long strip-shaped plastic magnets of any length can be made according to needs and uses.

[0112] Process step 5: Place the cut long strips of plastic magnets into a magnetizer for magnetization.

[0113] Process step six, placing the magnetized long strip plastic magnet into a punching machine and a mold to punch out a plastic magnet (11) with a groove (112), wherein the characteristics after punching are as follows: the two symmetrical sides of the plastic magnet (11) have mutually symmetrical grooves (112), the groove bottom surface (112a) of the groove (112) is a plane, the groove bottom angle (112r) is an arc, and the groove opening angle (112Ak) is a right angle; the groove depth of the groove (112) is 1.5-15mm; the groove width of the groove (112) of the plastic magnet (11) is 4-40mm; the spacing between the grooves (112) on one side of the plastic magnet (11) is 1-30 times the size of the groove width (112b); the number of the grooves (112) on one side of the plastic magnet (11) is N.

[0114] Process step seven: affixing an adhesive tape (12) to the attachment surface A (114A) of the plastic magnet (11) punched with the groove (112); that is, affixing the adhesive tape (12) to one side of the manufactured plastic magnet (11); the adhesive tape (12) is preferably a cloth-based tape.

[0115] The plastic magnet (11) is attached with an adhesive tape (12), thus forming a foldable magnetic attraction device (1) for a door curtain of the present invention.

[0116] The foldable magnetic device (1) for a door curtain produced by the process is used for the magnetic movable connection of the door curtain.

[0117] exist Figure 8 In the embodiment, the grooves on the two symmetrical sides of the plastic magnet (11) can also be configured as flat-bottom right-angle grooves (112T), full-arc angle grooves (112R), oblique bottom angle grooves (112K), or trapezoidal grooves (112X). Example

[0118] exist Figure 8 In the method, the grooves on two symmetrical sides of the plastic magnet (11) are arranged to be full arc angle grooves (112R).

[0119] exist Figure 8 , Fig. 9In the embodiment, the structure of the full arc angle groove (112R) includes a groove bottom surface R (112Ra), a groove width R (112Rb), a groove bottom angle R (112Rr), a groove depth R (112Rd), and a groove mouth angle R (112RAk).

[0120] The structural feature of the full arc angle groove (112R) is that the groove bottom surface R (112a) is a plane, the groove bottom surface R (112Ra) and the groove walls at both ends form an arc-shaped intersection angle; and the groove opening angles R (112RAk) on both sides of the groove opening are arc-shaped angles.

[0121] The function and effect of the arc-shaped notch angle R (112RAk) is to further facilitate the bending of the plastic magnet (11) of the present invention, making the plastic magnet (11) more flexible when bending, but the magnetic attraction is not as strong as when the notch angle is a right angle; compared with the groove (112) of the first embodiment, the groove (112) of the first embodiment has moderate magnetic attraction and a long service life. Example

[0122] exist Figure 8 In the method, the grooves on two symmetrical sides of the plastic magnet (11) are arranged as flat-bottomed right-angle grooves (112T).

[0123] exist Figure 8 The structural features of the flat-bottom right-angle groove (112T) are as follows: the groove bottom is a plane, the groove bottom and the groove wall are perpendicular to each other, and the angles on both sides of the groove opening are right angles; this is conducive to the bending and use of the plastic magnet (11).

[0124] The function and effect of the vertical intersection angle between the groove bottom and the groove wall is to make the plastic magnet (11) bend smoothly, but due to the vertical intersection angle between the groove bottom and the groove wall, it is easy to crack when bent and used; compared with the groove (112) of the first embodiment, the groove (112) of the first embodiment is more conducive to the bending of the plastic magnet (11) and has a long service life. Example

[0125] exist Figure 8 In the embodiment, the grooves on the two symmetrical sides of the plastic magnet (11) are arranged as oblique bottom angle grooves (112K).

[0126] exist Figure 8 The oblique bottom angle groove (112K) has the following structural features: the groove bottom is a plane, there is an oblique intersection angle between the groove bottom and the groove wall, and the angles on both sides of the groove opening are right angles; this is conducive to the bending and use of the plastic magnet (11).

[0127] The function and effect of the oblique intersection angle between the groove bottom and the groove wall are that the plastic magnet (11) is not prone to cracking, the bending angle is small, and the bending is not smooth; compared with the groove (112) of the first embodiment, the groove (112) of the first embodiment is more conducive to the bending of the plastic magnet (11) and has a long service life. Example

[0128] exist Figure 8 In the method, the grooves on two symmetrical sides of the plastic magnet (11) are arranged as trapezoidal grooves (112X).

[0129] exist Figure 8 The structural features of the trapezoidal groove (112X) are as follows: the groove bottom is a plane, the groove bottom width is smaller than the groove opening width, and the angles on both sides of the groove opening are obtuse angles; this facilitates bending for use.

[0130] The function and effect of the groove bottom width being smaller than the groove opening width is that the plastic magnet (11) is easy to bend for use and is not prone to cracking, which is beneficial for the free attraction of the present invention (1) when it is hung for use, but the bending amplitude changes little and is not convenient for folding and storage; compared with the groove (112) of the first embodiment, the groove (112) of the first embodiment is more conducive to the bending of the plastic magnet (11) and has a long service life.

Claims

1. A foldable magnetic attraction device (1) for a door curtain, comprising a plastic magnet (11) and an adhesive tape (12), characterized in that: One side of the plastic magnet (11) is bonded to an adhesive tape (12); and two mutually symmetrical sides of the plastic magnet (11) are provided with mutually symmetrical grooves (112).

2. A foldable magnetic device for a door curtain according to claim 1, characterized in that: The plastic magnet (11) comprises a plastic magnet block (111), a plastic magnet rib (111T), and a groove (112); the plurality of plastic magnet blocks (111) and the plurality of plastic magnet ribs (111T) are connected at intervals to form a long chain; the two side surfaces of the plastic magnet rib (111T) are provided with grooves (112) that are symmetrical to each other; the plastic magnet block (111) is a rectangular bar-shaped block, having a magnetic attraction surface A (113A) and a magnetic attraction surface B (113B); and having an attachment surface A (114A) and an attachment surface B (114B).

3. The foldable magnetic device for door curtain according to claim 1, characterized in that: The groove (112) comprises a groove bottom surface (112a), a groove width (112b), a groove bottom angle (112r), a groove depth (112d), and a groove opening angle (112Ak); the groove bottom surface (112a) is a plane, the groove bottom angle (112r) is an arc, and the groove opening angle (112Ak) is a right angle; 11b is the width of the plastic magnet (11); the groove depth (112d) is 0.3-0.48 times the width of the plastic magnet (11); and the groove width (112b) is 3-15 times the groove depth (112d).

4. A foldable magnetic attraction device (1) for a door curtain according to claim 1 or 2, characterized in that: One side of the plastic magnetic rib (111T) of the plastic magnet (11) is connected to the adhesive tape (12); two sides of the plastic magnetic rib (111T) are respectively provided with mutually symmetrical grooves (112); and one side of the plastic magnetic block (111) is connected to the adhesive tape (12).

5. A foldable magnetic device for a door curtain (1) according to claim 1 or 2, characterized in that: The grooves on the two symmetrical sides of the plastic magnet (11) are configured as flat-bottom right-angle grooves (112T), full-arc angle grooves (112R), oblique bottom angle grooves (112K), and trapezoidal grooves (112X).

6. A production process for producing claim 1, characterized in that: The production process of a foldable magnetic attraction device (1) for a door curtain comprises the production of a plastic magnet (11) and the pasting of an adhesive tape (12); the production of the plastic magnet (11) is as follows: the plastic magnet (11) is vulcanized by mixing CPE and magnetic powder, and after vulcanization, it is produced by manufacturing processes such as sheet pressing, multi-layer lamination, cutting, magnetizing, and grooving.

7. The production process according to claim 7, characterized in that: The production process of the foldable magnetic device (1) for door curtains is as follows: process step 1, CPE and magnetic powder are mixed and vulcanized, the mass ratio of CPE to magnetic powder is: CPE 5-25 parts, magnetic powder 75-95 parts, vulcanization temperature is 100-145 degrees; vulcanization time is 10-20 minutes, and the vulcanized magnetic plastic shape is a rectangular square sheet with a thickness of 2-10mm; Process step 2: The vulcanized magnetic plastic rectangular sheet is pressed by a roller press, the roller press pressure is 3-10 mp, the roller temperature is 40-80 degrees, the roller speed is 5-20 meters per minute, the ambient temperature is 5-30 degrees, and the thickness of the magnetic plastic rectangular sheet after rolling is 0.5-3 mm; Process step three: laminating the rolled magnetic plastic rectangular sheet in multiple layers, wherein the number of laminating layers is 2-12 layers; the die temperature is 70-90 degrees, and the ambient temperature is 5-30 degrees; the thickness of the laminated magnetic plastic rectangular sheet is 2-15 mm; Process step 4: cutting the laminated magnetic plastic rectangular sheet into long strip plastic magnets, wherein the width of the long strip plastic magnets is 3-30 mm; the thickness of the long strip plastic magnets is 2-15 mm; the length of the long strip plastic magnets is unlimited, and long strip plastic magnets of any length can be made according to needs and uses; Process step 5: placing the cut long strips of plastic magnets into a magnetizer for magnetization; Process step six, placing the magnetized long strip plastic magnet into a punching machine and a mold to punch out a plastic magnet (11) with a groove (112), wherein the characteristics after punching are as follows: the two symmetrical sides of the plastic magnet (11) have mutually symmetrical grooves (112), the groove bottom surface (112a) of the groove (112) is a plane, the groove bottom angle (112r) is an arc, and the groove opening angle (112Ak) is a right angle; the groove depth of the groove (112) is 1.5-15mm; the groove width of the groove (112) of the plastic magnet (11) is 4-40mm; the spacing between the grooves (112) on one side of the plastic magnet (11) is 1-30 times the size of the groove width (112b); the number of the grooves (112) on one side of the plastic magnet (11) is N; Process step seven: affixing an adhesive tape (12) to the attachment surface A (114A) of the plastic magnet (11) punched with the groove (112); that is, affixing the adhesive tape (12) to one side of the manufactured plastic magnet (11); the adhesive tape (12) is preferably a cloth-based tape; The plastic magnet (11) is attached with an adhesive tape (12), thus forming a foldable magnetic attraction device (1) for a door curtain of the present invention.

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