CN217169361U - Film stretching oven and combined heating unit - Google Patents

Abstract

The utility model relates to a tensile oven of film and combination formula heating unit heats the film through the electromagnetic radiation heater, can promote the temperature of film comparatively fast to predetermineeing the temperature, and heating efficiency improves greatly for traditional hot-blast heating methods. As the film is not required to be heated quickly by increasing the flow of hot air as in the traditional technology, the physical deformation of the film can be avoided, the air channeling interference is avoided, and the stability is improved. In addition, after hot air is blown to the transmission chain clamp through the hot air circulation mechanism, the hot air circulation mechanism heats the transmission chain clamp in a mode that the hot air contacts the transmission chain clamp, so that the temperature of the side part of the film can be raised to a preset temperature, and the processing quality of the film can be further ensured.

Description

Film stretching oven and combined heating unit

Technical Field

The utility model relates to a tensile technical field of film especially relates to tensile oven of film and combination formula heating unit.

Background

The film stretching oven is formed by combining a plurality of relatively independent functional sections with certain temperature difference, and the technological processes of preheating, stretching, heat setting, cooling or heat treatment after film coating and the like are respectively completed on each functional section from the inlet to the outlet of the oven under the traction of the chain clamps along the line on the two sides of the film. Each functional section comprises at least two oven units which are adjacently arranged, and the process temperature of each oven unit is often set to be the same and/or different according to the actual process requirement.

Because the film is generally high to the temperature precision, each oven unit is to the heating of film generally adopt the accurate hot-blast conduction mode of accuse temperature, heats its inside air through independent hot-blast return circuit in the oven unit promptly and obtains the hot-air, carries out the contact heating by the hot-air to the film surface again to constitute a plurality of stable hot-blast return circuits and guarantee the homogeneity of temperature: the method comprises the following steps of backflow air, a heater, a centrifugal fan, hot air distribution, a static pressure box (nozzle), film heat exchange, internal space return, a return air suction opening and the next circulation.

When the process temperature of two adjacent oven units is greatly raised, the heating efficiency based on a hot air conduction mode is not high, and the core layer of the film and the surface layer can reach the heat setting process temperature quickly by increasing the hot air output (speed) acting on the film. However, increasing the amount of hot air can easily cause serious air channeling among the oven units, which affects the stability of the temperature fields. On the other hand, since a part of the film is very thin (3 μm to 5 μm) after being stretched at a high magnification in the stretching section, the external stretching tension is eliminated with the completion of the stretching process, and the film is in the weakest state before heat setting, and the high-speed air flow in the initial section of the heat setting section easily causes the defect of plastic deformation of the film.

SUMMERY OF THE UTILITY MODEL

In view of the foregoing, there is a need to overcome the disadvantages of the prior art and to provide a film stretching oven and a combined heating unit that can improve the heating efficiency and ensure the processing quality of the film.

The technical scheme is as follows: a modular heating unit, the modular heating unit comprising: the box body is provided with a transportation channel; the track penetrates through the box body through the conveying channel, the transmission chain clamp is arranged on the track, and the transmission chain clamp is used for clamping the side part of the film and synchronously driving the film to run; the electromagnetic radiation heater is arranged in the box body and is arranged above and/or below the film; and the hot air circulating mechanism is used for blowing hot air to the transmission chain clamp and the film side part of the combined heating unit.

In one embodiment, the electromagnetic radiation heater comprises a reflective enclosure and at least one infrared element disposed on the reflective enclosure, the infrared element facing the film; the infrared element is an infrared lamp tube and/or an infrared plate.

In one embodiment, the infrared element is disposed to extend along a transverse direction of the film; the number of the infrared elements is at least two, and all the infrared elements are sequentially arranged at intervals along the longitudinal direction of the film.

In one embodiment, the hot air circulation mechanism comprises a wind shielding structure, an air inlet pipe and an air return pipe; the wind shielding structure and the rail are enclosed to form a hot air channel, and the transmission chain clamp is movably arranged in the hot air channel in a penetrating mode; the air inlet pipe and the air return pipe are communicated with the hot air channel, the air inlet pipe is used for introducing hot air into the hot air channel, and the air return pipe is used for recovering the hot air in the hot air channel.

In one embodiment, the wind shielding structure comprises a first wind shielding plate and a second wind shielding plate; the first wind shield and the second wind shield are arranged at intervals up and down to form a first gap through which the film penetrates, the first wind shield and the second wind shield are arranged at intervals with the transmission chain clamp, and the first wind shield, the second wind shield and the rail are enclosed to form a hot air channel.

In one embodiment, the air return pipe and the air inlet pipe are respectively arranged at two ends of the hot air channel along the running direction of the film.

In one embodiment, the arrangement direction of the air inlet pipe forms an included angle with the running direction of the film; the included angle between the air inlet pipe and the running direction of the film is defined as a, and a is less than 90 degrees.

In one embodiment, along the running direction of the film, two opposite ends of the box body are provided with partition plates, the transportation channel is arranged on the partition plates, and the wall of the transportation channel is provided with a wind shielding piece.

In one embodiment, each wind shielding piece comprises a first wind curtain and a second wind curtain which are arranged on the wall of the transportation channel at intervals up and down, and a second gap for the thin film to pass through is formed between the first wind curtain and the second wind curtain.

A film stretching oven comprising at least one of said modular heating units.

Foretell tensile oven of film and combination formula heating unit, the during operation, on the one hand, heats the film through the electromagnetic radiation heater, can promote the temperature of film comparatively fast to predetermineeing the temperature, and heating efficiency improves greatly for traditional hot-blast heating methods, heating efficiency. As the film is not required to be heated quickly by increasing the flow of hot air as in the traditional technology, the physical deformation of the film can be avoided, and the processing quality of the film can be ensured. In addition, the wind interference can be avoided, i.e. the stability is improved. In addition, the electromagnetic radiation heater can heat all parts of the film by means of infrared light, but cannot directly heat the transmission chain clamp made of metal, and the transmission chain clamp can absorb heat of the side parts of the film in the process of clamping the side parts of the film, so that the temperature of the side parts of the film is relatively lower than that of the middle part of the film. After hot air is blown to the transmission chain clamp through the hot air circulation mechanism, the hot air circulation mechanism heats the transmission chain clamp in a mode that hot air contacts the transmission chain clamp, so that the temperature of the side part of the film can be raised to a preset temperature, and the processing quality of the film can be ensured.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a perspective schematic view of a combined heating unit according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a combined heating unit according to an embodiment of the present invention;

FIG. 3 is a schematic view of the structure of the electromagnetic radiation heater shown in FIG. 2 after being hidden;

FIG. 4 is a schematic bottom view of the modular heating unit of the configuration of FIG. 2;

FIG. 5 is a schematic cross-sectional view at A-A of FIG. 4;

fig. 6 is an enlarged schematic view of fig. 5 at B.

10. A film; 20. an electromagnetic radiation heater; 21. a reflector; 22. an infrared element; 30. a track; 40. A drive chain clip; 50. a hot air circulating mechanism; 51. a first windshield; 52. a second wind deflector; 53. an air inlet pipe; 54. a return air duct; 55. a hot air passage; 56. a first gap; 60. a partition plate; 61. a window; 62. A wind shielding member; 621. a first air curtain; 622. a second air curtain; 623. a second gap; 70. a box body; 71. side plates.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

Referring to fig. 1 to 3, fig. 1 shows a schematic structural diagram of a film stretching oven according to an embodiment of the present invention, fig. 2 shows a schematic perspective structural diagram of a combined heating unit according to an embodiment of the present invention, and fig. 3 shows a schematic structural diagram of a combined heating unit according to an embodiment of the present invention. An embodiment of the utility model provides a pair of modular heating unit, modular heating unit includes: a box 70, a track 30 and a driving chain clamp 40, an electromagnetic radiation heater 20 and a hot air circulating mechanism 50. The case 70 is provided with a transportation passage. The track 30 passes through the transportation channel and is arranged in the box body 70, the transmission chain clamp 40 is arranged on the track 30, and the transmission chain clamp 40 is used for clamping the side part of the film 10 and synchronously driving the film 10 to run. The electromagnetic radiation heater 20 is disposed in the case 70, and the electromagnetic radiation heater 20 is disposed above and/or below the thin film 10. The hot air circulating mechanism 50 is used to blow hot air to the drive chain nip 40 and the side portion of the film 10 in the combined heating unit.

When the combined heating unit works, on one hand, the film 10 is heated through the electromagnetic radiation heater 20, the temperature of the film 10 can be rapidly increased to a preset temperature, and the heating efficiency is greatly improved compared with the traditional hot air heating mode. Since the temperature of the film 10 does not need to be rapidly raised by increasing the flow rate of hot air as in the conventional art, the physical deformation of the film 10 can be prevented, and the processing quality of the film 10 can be ensured. In addition, the wind interference can be avoided, i.e. the stability is improved. In addition, the electromagnetic radiation heater 20 can heat all the parts of the film 10 by means of infrared light, but cannot directly heat the metal driving chain clamp 40, and the driving chain clamp 40 can absorb heat from the side parts of the film 10 while clamping the side parts of the film 10, so that the temperature of the side parts of the film 10 is relatively lower than that of the middle part of the film 10. After hot air is blown to the transmission chain clamp 40 through the hot air circulation mechanism 50, the hot air circulation mechanism 50 heats the transmission chain clamp 40 in a mode that the hot air contacts the transmission chain clamp 40, so that the temperature of the side part of the film 10 can be raised to a preset temperature, and the processing quality of the film 10 can be further ensured.

Alternatively, in order to ensure the heating effect of the electromagnetic radiation heater 20 on the thin film 10, the wavelength of the electromagnetic radiation heater 20 is configured to be compatible with the molecules of the heated material.

Referring to fig. 1 and 2, in one embodiment, the electromagnetic radiation heater 20 includes a reflector 21 and at least one infrared element 22 disposed on the reflector 21. An infrared element 22 is directed toward the film 10. Thus, when the electromagnetic radiation heater 20 is operated, the infrared element 22 emits infrared light toward the film 10, thereby raising the temperature of the film 10 to the second process temperature. In addition, the reflective cover 21 reflects infrared light of the infrared element 22, and improves the heating effect of the infrared element 22. Optionally, the infrared element 22 includes, but is not limited to, an infrared lamp tube and/or an infrared plate, which are selected and arranged according to actual requirements, and is not limited herein.

Referring to fig. 1 and 2, in one embodiment, the infrared elements 22 extend along a transverse direction (e.g., the direction indicated by the y-axis in fig. 1) of the film 10. Specifically, the infrared elements 22 project onto the film 10 in a direction perpendicular to the film 10 across opposite sides of the film 10. Thus, the infrared ray emitted by the infrared element 22 can cover all parts of the film 10 in the transverse direction, and the heating effect of the film 10 is good.

Referring to fig. 1 and 2, in one embodiment, there are at least two infrared elements 22, and all the infrared elements 22 are sequentially spaced along the running direction (the direction indicated by the x-axis in fig. 1) of the film 10. Thus, during the operation of the film 10 through the modular heating unit, various portions of the film 10, including the transverse direction (as shown by the y-axis in FIG. 1) and the longitudinal direction (as shown by the x-axis in FIG. 1), as well as the skin and core layers, are better heated; in addition, the temperature of the film 10 may gradually increase as it moves through the combined heating unit, and may reach the second process temperature as the film 10 exits the combined heating unit.

Alternatively, the electromagnetic radiation heater 20 may be disposed at intervals directly above the film 10, and emit infrared light to the upper surface of the film 10 from above to heat the entire film 10; the electromagnetic radiation heater 20 may be disposed at an interval just below the film 10, and emit infrared light from below to the lower surface of the film 10 to heat the entire film 10.

Referring to fig. 4 to 6, two drive chain clips 40 and two tracks 30 are provided, and the two drive chain clips 40 are disposed on the two tracks 30 in a one-to-one correspondence manner. One of the drive chain clamps 40 is for clamping one of the sides of the film 10 and the other drive chain clamp 40 is for clamping the other side of the film 10. Correspondingly, the number of the hot air circulating mechanisms 50 is two, and the two hot air circulating mechanisms 50 are arranged in one-to-one correspondence with the two transmission chain clamps 40. Thus, the two hot air circulating mechanisms 50 can respectively and synchronously heat the two transmission chain clamps 40, and can ensure that the temperatures of the two opposite sides of the film 10 are all increased to the second process temperature, so that the processing quality of the film 10 can be ensured.

Referring to fig. 4-6, in one embodiment, the hot air circulating mechanism 50 includes a wind shielding structure, an air inlet pipe 53 and an air return pipe 54. The wind shielding structure and the rail 30 enclose to form a hot air channel 55, and the transmission chain clamp 40 is movably arranged in the hot air channel 55 in a penetrating way. The air inlet pipe 53 and the air return pipe 54 are both communicated with the hot air channel 55, the air inlet pipe 53 is used for introducing hot air into the hot air channel 55, and the air return pipe 54 is used for recovering the hot air in the hot air channel 55. Therefore, when the hot air recovery device works, hot air enters the hot air channel 55 through the air inlet pipe 53, correspondingly heats the transmission chain clamp 40 in the process that the hot air contacts the transmission chain clamp 40, and the hot air after heat exchange with the transmission chain clamp 40 is recovered through the air return pipe 54.

Referring to fig. 4 to 6, in one embodiment, the wind shielding structure includes a first wind shield 51 and/or a second wind shield 52. The first wind deflector 51 and the second wind deflector 52 are vertically spaced to form a first gap 56 (as shown in fig. 6) through which the film 10 passes, the first wind deflector 51 and the second wind deflector 52 are spaced from the transmission chain clamp 40, and the first wind deflector 51, the second wind deflector 52 and the rail 30 enclose to form a hot air channel 55. In this way, as the first wind deflector 51, the second wind deflector 52 and the rail 30 enclose and form the hot air channel 55, hot air entering the hot air channel 55 can fully contact and heat the transmission chain clamp 40, so that the hot air heating effect on the transmission chain clamp 40 is better; in addition, the first wind deflector 51 and the second wind deflector 52 are isolated, that is, the hot air in the hot air channel 55 only heats the transmission chain clip 40 and the side portions of the film 10, and basically does not enter the middle area of the film 10, that is, does not heat the middle portion of the film 10, so that the heating effect on the side portions of the film 10 can be ensured.

It should be noted that, in order to heat the side portion of the film 10 to the preset temperature, the temperature of the hot air introduced through the air inlet pipe 53 is flexibly adjusted and set according to the preset temperature, as long as the side portion of the film 10 is heated to the preset temperature.

Referring to fig. 4 to 6, in an embodiment, in order to improve the tightness of the hot air channel 55 formed by the first wind deflector 51, the second wind deflector 52 and the rail 30, the first wind deflector 51 and the second wind deflector 52 are all set to have an L shape, an arc shape, or the like, and may be regular or irregular.

Referring to fig. 1, in one embodiment, the air return duct 54 and the air inlet duct 53 are respectively disposed at two ends of the hot air channel 55 along the moving direction of the film 10 (e.g., the x-axis direction of fig. 1). In this way, along the running direction of the film 10, the temperature of the hot air inside the hot air channel 55 is gradually increased, so that the temperature of the side portion of the film 10 can be gradually increased to the preset temperature by the hot air inside the hot air channel 55. In addition, the hot air can be ensured to flow in the whole hot air channel 55, so that the heating effect on the side part of the film 10 and the transmission chain clamp 40 is better.

As an alternative, the air inlet pipe 53 and the air return pipe 54 may also be communicated with the hot air channel 55 in other arrangements, and are flexibly set and adjusted according to actual requirements, which is not limited herein.

Referring to fig. 4, in one embodiment, the air inlet pipe 53 is disposed at an angle to the running direction of the film 10; the angle between the air inlet duct 53 and the direction of travel of the film 10 is defined as a, a <90 °. As one example, a ≦ 60 °, including but not limited to 45 °, 30 °, 25 °, 20 °, 15 °, 10 °, 5 °, and so forth. Thus, the air inlet pipe 53 can smoothly introduce hot air into the hot air passage 55, and the hot air introduced into the hot air passage 55 exchanges heat with the drive chain clip 40 and the side portion of the film 10, and is then recovered by the return air pipe 54.

In one embodiment, the air inlet pipe 53 may be connected to a separate hot air source, that is, hot air is fed into the hot air channel 55 through the air inlet pipe 53 by the separate hot air source; accordingly, the return duct 54 circulates the hot air inside the hot air passage 55 to the separate hot air source, heats the recovered hot air to a preset temperature by the separate hot air source, and then delivers the heated hot air to the intake duct 53.

In another embodiment, the air inlet pipe 53 can also be connected to the hot air source inside the other functional section through a duct, that is, by feeding a part of the hot air source inside the other functional section into the hot air passage 55 through the air inlet pipe 53. Accordingly, the return air pipe 54 directly discharges the hot air in the hot air channel 55 to the outside, and the hot air can be circulated to the inside of other functional sections, and the other functional sections heat the recovered hot air to a preset temperature.

It should be noted that, the air inlet pipe 53 is connected to the first wind deflector 51 or the second wind deflector 52, and the "air inlet pipe 53" may be a part of the "first wind deflector 51 or the second wind deflector 52", that is, the "air inlet pipe 53" and the "other part of the first wind deflector 51 or the second wind deflector 52" are integrally formed; or a separate member which is separable from the other portion of the first wind deflector 51 or the second wind deflector 52, that is, the "air inlet duct 53" may be separately manufactured and then integrated with the other portion of the first wind deflector 51 or the second wind deflector 52.

It should be noted that the return duct 54 is connected to the first wind deflector 51 or the second wind deflector 52, and the "return duct 54" may be a part of the "first wind deflector 51 or the second wind deflector 52", that is, the "return duct 54" and the "other part of the first wind deflector 51 or the second wind deflector 52" are integrally formed; or a separate component which can be separated from the other parts of the first wind deflector 51 or the second wind deflector 52, that is, the "return air pipe 54" can be manufactured separately and then combined with the other parts of the first wind deflector 51 or the second wind deflector 52 into a whole.

Referring to fig. 1 and 3, in one embodiment, partitions 60 are provided at opposite ends of the box 70 along the running direction of the film 10, the transportation path is provided on the partitions 60, and wind shielding members 62 are provided on the walls of the transportation path. Therefore, the wind shielding part 62 at one end of the combined heating unit can prevent hot wind in the upstream functional section from entering the combined heating unit through the cross flow of the conveying channel as much as possible, and the wind shielding part 62 at the other end of the combined heating unit can prevent hot wind in the downstream functional section from entering the combined heating unit through the cross flow of the conveying channel as much as possible, so that the hot wind in the upstream functional section and the hot wind in the downstream functional section are completely isolated from each other, the hot wind in the upstream functional section and the hot wind in the downstream functional section are prevented from mutual cross flow influence, and the processing quality of the film 10 is ensured.

Referring to fig. 1 and 3, in one embodiment, each wind shielding member 62 includes a first wind curtain 621 and a second wind curtain 622 spaced apart from each other up and down on the wall of the transportation channel, and the first wind curtain 621 and the second wind curtain 622 form a second gap 623 (as shown in fig. 3) for the film 10 to pass through. Thus, the first air curtain 621 and the second air curtain 622 are adopted to keep out the wind, so that a good wind-shielding isolation effect can be ensured, and meanwhile, the damage to the film 10 is small. Specifically, the first air curtain 621 and the second air curtain 622 are made of a high temperature resistant non-metal material and/or a metal material, including but not limited to silicone, rubber, resin, and plastic.

Referring to fig. 1-6, in one embodiment, a film stretching oven includes at least one combined heating unit of any of the above embodiments.

When the film stretching oven works, on one hand, the film 10 is heated through the electromagnetic radiation heater 20, the temperature of the film 10 can be rapidly increased to the preset temperature, and the heating efficiency is greatly improved compared with the traditional hot air heating mode. Since the temperature of the film 10 does not need to be rapidly raised by increasing the flow rate of hot air as in the conventional art, the physical deformation of the film 10 can be prevented, and the processing quality of the film 10 can be ensured. In addition, the wind interference can be avoided, i.e. the stability is improved. In addition, the electromagnetic radiation heater 20 can heat all the portions of the film 10 by means of infrared light, but cannot directly heat the metal power transmission chain clamp 40, and the power transmission chain clamp 40 absorbs heat from the side portions of the film 10 while clamping the side portions of the film 10, so that the temperature of the side portions of the film 10 is relatively lower than that of the middle portion of the film 10. After hot air is blown to the transmission chain clamp 40 through the hot air circulation mechanism 50, the hot air circulation mechanism 50 heats the transmission chain clamp 40 in a mode that the hot air contacts the transmission chain clamp 40, so that the temperature of the side part of the film 10 can be raised to a preset temperature, and the processing quality of the film 10 can be further ensured.

In one embodiment, the film stretching oven includes a plurality of functional segments arranged in series in sequence along the direction of travel of the film 10. The plurality of functional stages include, but are not limited to, a pre-heat stage, a stretch stage, a heat setting stage, a buffer stage, a cooling stage, or a post-film coating heat treatment stage. The preheating section adopts a hot air loop mode to provide hot air for heating the film 10 positioned in the preheating section, so that the film 10 can be heated to the first process temperature. The stretching section is used to stretch the film 10 while heating the film 10 to a second process temperature. The heat setting section is used to heat set the film 10 and control the film 10 to a third process temperature. The buffer section is arranged between the heat setting section and the cooling section, plays a role in buffering, and can avoid the mutual cross flow influence between the heat setting section and the cooling section. The cooling section cools the film 10 to room temperature.

Referring to fig. 1, the preheating section, the stretching section, the heat setting section, the buffering section and the cooling section each include at least two oven units sequentially connected in series along the longitudinal direction. The process temperature of each oven unit can be flexibly adjusted and set according to actual requirements, and only the process temperature of each oven unit is required to be met. In addition, any two adjacent oven units are separated by the partition plate 60, so that the independence of the oven units is improved, the temperature of each oven unit is controlled conveniently, and meanwhile, the phenomenon of hot air channeling interference between the oven units can be avoided.

In one embodiment, any one of the oven units in the above functional sections is configured as a combined heating unit in any of the above embodiments.

In one embodiment, the housing 70 provides a relatively closed environment, which ensures the processing quality of the film 10, and serves to collect hot air so as to recycle the hot air, thereby preventing the hot air from being discharged to the outside. Specifically, the box 70 includes a top plate (hidden in the drawing and not shown) and a bottom plate (hidden in the drawing and not shown) which are oppositely arranged, and two side plates 71 which are oppositely arranged, and the top plate is connected with the bottom plate through the two side plates 71.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims (10)

1. A modular heating unit, characterized in that it comprises:

the box body is provided with a transportation channel;

the track penetrates through the box body through the conveying channel, the transmission chain clamp is arranged on the track, and the transmission chain clamp is used for clamping the side part of the film and synchronously driving the film to run;

the electromagnetic radiation heater is arranged in the box body and is arranged above and/or below the film;

and the hot air circulating mechanism is used for blowing hot air to the transmission chain clamp and the film side part of the combined heating unit.

2. The modular heating unit of claim 1 wherein the electromagnetic radiation heater comprises a reflective housing and at least one infrared element disposed on the reflective housing, the infrared element being directed toward the film; the infrared element is an infrared lamp tube and/or an infrared plate.

3. The modular heating unit of claim 2 wherein said infrared element is disposed to extend along a transverse direction of said film; the number of the infrared elements is at least two, and all the infrared elements are sequentially arranged at intervals along the longitudinal direction of the film.

4. The modular heating unit of claim 1 wherein said hot air circulation mechanism comprises a wind shield, an air inlet duct and an air return duct; the wind shielding structure and the rail are enclosed to form a hot air channel, and the transmission chain clamp is movably arranged in the hot air channel in a penetrating mode; the air inlet pipe and the air return pipe are communicated with the hot air channel, the air inlet pipe is used for introducing hot air into the hot air channel, and the air return pipe is used for recovering the hot air in the hot air channel.

5. The combined heating unit of claim 4, wherein the wind shielding structure comprises a first wind shield and a second wind shield; the first wind shield and the second wind shield are arranged at intervals up and down to form a first gap through which the film penetrates, the first wind shield and the second wind shield are arranged at intervals with the transmission chain clamp, and the first wind shield, the second wind shield and the rail are enclosed to form a hot air channel.

6. The modular heating unit of claim 5 wherein said return air duct and said air inlet duct are disposed at opposite ends of said hot air passageway along the direction of travel of said film.

7. The modular heating unit of claim 5 wherein the air inlet duct is disposed at an angle to the direction of travel of the film; the included angle between the air inlet pipe and the running direction of the film is defined as a, and a is less than 90 degrees.

8. The modular heating unit according to claim 1, wherein partitions are provided at opposite ends of the housing in the direction of travel of the film, the transport channel being provided on the partitions, and wind shields being provided on the walls of the transport channel.

9. The combined heating unit of claim 8, wherein each wind shield comprises a first wind curtain and a second wind curtain arranged on the wall of the transportation channel at an interval from top to bottom, the first wind curtain and the second wind curtain forming a second gap for the film to pass through.

10. A film stretching oven characterized in that it comprises at least one combined heating unit according to any one of claims 1 to 9.

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