CN110936593A - Waterproof ventilated membrane stretching device - Google Patents
Waterproof ventilated membrane stretching device Download PDFInfo
- Publication number
- CN110936593A CN110936593A CN201911338124.XA CN201911338124A CN110936593A CN 110936593 A CN110936593 A CN 110936593A CN 201911338124 A CN201911338124 A CN 201911338124A CN 110936593 A CN110936593 A CN 110936593A
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- Prior art keywords
- film
- stretching
- roller
- rollers
- air
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
- B29C55/065—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed in several stretching steps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/045—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using gas or flames
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/06—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam for articles of indefinite length
Abstract
The invention relates to a waterproof breathable film stretching device which comprises an oven, an air heater and at least 4 groups of solid stretching rollers, wherein both ends of the oven are respectively provided with a film inlet and a film outlet, each side surface of the oven is provided with the air heater, and the top of the oven is provided with an air suction port; the air inlet of the air heater is in fluid communication with the air suction opening, and the air outlet of the air heater is in fluid communication with the hot air opening; the stretching rollers are arranged on the same horizontal plane in the oven in a centered mode and are evenly spaced, and the rotating speed of the stretching rollers is increased in sequence along the advancing direction of the film. The film is stretched in multiple steps, the stretching rate of each step is small, the film can be fully and uniformly stretched, the air permeability is uniform, the width size is reduced less, and the product yield is improved; and because the film adopts the heated air to heat in the oven uniformly, the surface heating temperature of the film is more uniform compared with the existing heat-conducting oil heating mode, and the stretching is more uniform.
Description
Technical Field
The invention relates to the field of waterproof breathable film production devices, in particular to a waterproof breathable film stretching device.
Background
The waterproof and breathable film is mainly formed by adding inorganic mineral filler into thermoplastic plastic serving as a carrier through extrusion molding by a casting cold roll forming method and then longitudinally stretching to enable the film to have a unique microporous structure. The micropores with special structures are distributed on the surface of the waterproof breathable film in a high-density manner, so that the waterproof breathable film can not only prevent liquid water from leaking, but also allow gas molecules such as water vapor and the like to pass through. The main application fields of the existing waterproof breathable film comprise personal hygiene nursing products, medical protective products (such as medical mattresses, protective clothing, surgical gowns, surgical sheets, heat application, medical pillowslip and the like), personal protective products in special places, clothing linings, auxiliary materials for medicine packaging, building industry and the like. Waterproof, breathable films have been widely used in the above fields in europe and america, japan, korea, far east, and in the harbor counter areas of our country. The existing waterproof breathable film stretching device (shown in figure 1) uses 3 groups of hollow stretching rollers 3 to stretch a film 100, the film 100 adopts an S-shaped film, the stretching times are less, and the single stretching proportion is larger and uneven easily occurs; and the roller surface uses the conduction oil that flows through from its inner chamber to heat, gives the film with heat transfer again, uses the back for a long time, has the scale deposit to produce to lead to roller surface temperature uneven, this can lead to the film surface temperature of being heated inhomogeneous, thereby lead to tensile inhomogeneous and finally the air permeability deviation between the different positions of waterproof ventilated membrane finished product great, be difficult to be applied to and require the less field of air permeability deviation.
Disclosure of Invention
The invention aims to provide a waterproof breathable film stretching device, which aims to solve the problem that the existing stretching device is easy to stretch unevenly.
To achieve the above object, according to an embodiment of the present invention, there is provided a waterproof breathable film stretching device, which may include:
the device comprises a drying oven, a film inlet and a film outlet are respectively arranged at two ends of the drying oven, a hot air port is arranged on each side surface, and an air suction port is arranged at the top of the drying oven;
the air inlet of the hot air blower is communicated with the air suction opening in a fluid manner, the air outlet of the hot air blower is communicated with the hot air opening in a fluid manner,
and at least 4 groups of solid stretching rollers are arranged on the same horizontal plane in the oven in the center and are uniformly spaced, a film enters from the film inlet by adopting a straight line, is stretched by each group of stretching rollers in sequence and leaves from the film outlet, and the rotating speed of the stretching rollers is increased progressively in sequence along the advancing direction of the film.
Further, the number of the stretching rollers was 5 sets, and the rotation speed ratios therebetween were 1.15, 1.17, and 1.17, respectively.
Furthermore, each stretching roller pair comprises a driving roller and a pressing roller, the driving roller is a stainless steel roller, and the pressing roller is a rubber roller.
Further, the drive roll and the press roll each have a diameter of 100 mm.
Further, the distance between the adjacent pairs of stretching rollers was 20 mm.
Furthermore, an air suction cover is arranged in the oven and is positioned above the stretching roller to serve as the air suction opening.
Further, still include preheating roller set and design roller set, preheating roller set arranges before advancing the membrane mouth, design roller set arranges after the play membrane mouth.
Further, preheat the roller set with advance and be equipped with first deflector roll between the membrane mouth, go out the membrane mouth with be equipped with the second deflector roll between the design roller set.
Further, the preheating roller set and the shaping roller set respectively comprise three hollow rollers and two compression rollers, the three hollow rollers are arranged in an inverted isosceles triangle, and the two compression rollers are pressed on the hollow rollers on two sides.
Further, the diameter of the hollow roller is larger than that of the press roller.
Furthermore, the first roller, the second roller and the hollow roller are all provided with heat conducting oil which flows through the inner cavities of the first roller, the second roller and the hollow roller.
By adopting the technical scheme, the invention has the beneficial effects that: the film is stretched in multiple steps (more than three steps), the stretching rate of each step is small, the film can be fully and uniformly stretched, the air permeability is uniform, the width size is reduced less, and the product yield is improved; and because the film adopts the heated air to heat in the oven uniformly, the surface heating temperature of the film is more uniform compared with the existing heat-conducting oil heating mode, and the stretching is more uniform.
Drawings
FIG. 1 is a schematic view of a prior art stretching apparatus;
fig. 2 is a schematic view of a stretching apparatus according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings in order to more clearly understand the objects, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.
Throughout the specification and claims, the word "comprise" and variations thereof, such as "comprises" and "comprising," are to be understood as an open, inclusive meaning, i.e., as being interpreted to mean "including, but not limited to," unless the context requires otherwise.
Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and/or" unless the context clearly dictates otherwise.
In the following description, for the purposes of clearly illustrating the structure and operation of the present invention, directional terms will be used, but terms such as "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be construed as words of convenience and should not be construed as limiting terms.
It is to be noted that in the claims and the description of the present application, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
As shown in fig. 2, a waterproof breathable film stretching apparatus according to an embodiment of the present invention may include an oven 1, a hot air blower 2, and at least 4 sets (5 sets are shown) of solid stretching rollers 3. The oven 1 has a rectangular parallelepiped shape, and is substantially closed except for a film inlet 11 and a film outlet 12 provided at both ends to prevent heat loss. Preferably, the outer surface of oven 1 is coated with a heat insulating layer to reduce heat loss and save energy consumption. Each side of the oven 1 is provided with a hot air port, and the top of the oven is provided with an air suction port. In the embodiment shown, the air suction opening takes the form of an air suction hood 4. An air draft hood 4 is arranged inside the oven 1 above the stretching roller 3. The air inlet of the air heater 2 is communicated with the air suction opening in a fluid mode, and the air outlet is communicated with the hot air opening in a fluid mode. I.e. the internal circulation of oven 1 by means of hot air blower 2, on the one hand ensures that the temperature inside oven 1 is substantially at the desired temperature (for example 80 ℃), and on the other hand greatly improves the energy efficiency. The sets of draw rolls 3 are centrally arranged on the same horizontal plane within the oven 1 and are evenly spaced apart. The film is linearly moved, enters the oven 1 from the film inlet 11, is sequentially stretched by the stretching rollers 3, and leaves the oven 1 from the film outlet 12, so that the stretching process is completed. Because the film adopts the heating air to heat in oven 1 uniformly, make the film surface temperature of being heated more even for current conduction oil heating mode to make the drawing more even. The rotation speed of the stretching roller 3 is sequentially increased in the film advancing direction. In one specific embodiment, the number of draw rolls is 5 sets with a ratio of 1.15, 1.17 and 1.17 between the speeds. In this case, the film is capable of achieving a stretch of 1.84(1.15 × 1.17 ═ 1.84). Because multi-step (more than three steps) stretching is adopted, for the same stretching multiple, the stretching rate of each step is smaller, the full and uniform stretching of the film can be realized, the air permeability is uniform, the width size of the product is reduced less, and the product yield is improved.
Each group of stretching rollers 3 comprises a driving roller 31 and a pressing roller 32, wherein the driving roller 31 is a stainless steel roller, and the pressing roller 32 is a rubber roller. The drive roll 31 and the press roll 32 may have the same or different diameters. In the embodiment shown, the drive roll 31 and the pressure roll 32 are of the same diameter. Preferably, it has a diameter of 80-150 mm. The diameter is reduced compared to the prior art stretching roller 3, so that the stretching gap is reduced to ensure an increased stretching efficiency in a single stretching. In a specific embodiment, the diameter of each of the drive roll 31 and the press roll 32 is 100 mm, and the distance between two adjacent sets of stretching rolls 3 is 20 mm.
In the illustrated embodiment, the stretching apparatus of the present invention may further include a preheating roller group 5 and a shaping roller group 6, wherein the preheating roller group 5 is disposed before the film inlet 11 of the oven 1 for preheating the film, for example, to about 50 ℃. The preheating roller group 5 includes three hollow rollers 51 and two press rollers 52, wherein the three hollow rollers 51 are arranged in an inverted isosceles triangle, and the two press rollers 52 press against the hollow rollers 51 on both sides. Heat conducting oil is filled in the hollow roller 51, namely the heat conducting oil is used for heating. The diameter of the hollow roller 51 is generally larger than the diameter of the press roller 52. The shaping roller set 6 is arranged after the film outlet 12 of the oven 1. The shaping roller set 6 has the same structure as the preheating roller set 5 and is used for shaping the stretched film. The film adopts S-shaped film-moving to pass through the preheating roller set 5 and the shaping roller set 6.
Preferably, a first guide roller 7 is arranged between the preheating roller group 5 and the film inlet 11, and a second guide roller 8 is arranged between the film outlet 12 and the shaping roller group 6. Specifically, the first guide roller 7 and the second guide roller 8 are respectively arranged outside the oven 1 and close to the film inlet 11 and the film outlet 12. The first guide roll 7 and the second guide roll 8 are arranged with the stretching roll 3 such that the film therebetween is on the same horizontal plane. Advantageously, in the embodiment shown, a third guide roller 9 is also provided between the second guide roller 8 and the set of shaping rollers 6. The third guide roller 9 is lower than the second selected area, and the first guide roller 7 and the second guide roller 8 are also heated by adopting heat conduction oil.
The beneficial effects of the new stretching device are illustrated by comparative experiments. The experimental materials are the waterproof breathable film stretched by adopting the traditional stretching device and the novel stretching device. The width of the waterproof and breathable film is about 1.6 m, samples are taken every 300 mm, and 5 groups of samples are totally represented by 1-5 respectively.
Experiment one
Measuring the grammage (unit: g/m)2) The results are shown in Table 1.
TABLE 1 grammage comparison
As can be seen from Table 1, the waterproof breathable film obtained by the novel stretching device has better uniformity.
Experiment two
The air passage time (unit: second) was measured using a blood pressure meter, and the results of the experiment are shown in Table 2.
TABLE 2 comparison of ventilation transit times
As can be seen from Table 2, the waterproof breathable film obtained by the novel stretching device has better uniformity.
Experiment three
Air permeability (unit: sec) was measured using a jordan air permeameter, which measures the time for every cubic meter of air to pass through 1 square meter of air permeable membrane, and the results of the experiment are shown in table 3.
TABLE 3 air permeability contrast
As can be seen from Table 3, the breathable films obtained using the conventional stretching apparatus have non-uniform air permeability: the maximum value reaches 20325, the minimum value is only 13550, the difference between the maximum value and the minimum value is 6775, the difference between the maximum value 17782 and the minimum value 16640 of the breathable film obtained by using the new stretching device is only 1142, and the uniformity of the waterproof breathable film obtained by using the new stretching device is better.
Experiment four
Moisture permeability (unit: g/m) of 24 hours is measured by adopting a constant temperature and humidity chamber2) The results are shown in Table 4.
TABLE 3 comparison of moisture vapor transmission
As can be seen from Table 4, the moisture permeability of the breathable film obtained by using the conventional stretching apparatus was not uniform: the maximum value reaches 1231, the minimum value is just 529, the difference between the maximum value 607 and the minimum value 560 of the breathable film obtained by adopting the new stretching device is just 47, and the uniformity of the waterproof breathable film obtained by adopting the new stretching device is better.
While the preferred embodiments of the present invention have been illustrated and described in detail, it should be understood that various changes and modifications of the invention can be effected therein by those skilled in the art after reading the above teachings of the invention. Such equivalents are intended to fall within the scope of the claims appended hereto.
Claims (10)
1. The utility model provides a waterproof ventilated membrane stretching device which characterized in that includes:
the device comprises a drying oven, a film inlet and a film outlet are respectively arranged at two ends of the drying oven, a hot air port is arranged on each side surface, and an air suction port is arranged at the top of the drying oven;
the air inlet of the hot air blower is communicated with the air suction opening in a fluid manner, the air outlet of the hot air blower is communicated with the hot air opening in a fluid manner,
and at least 4 groups of solid stretching rollers are arranged on the same horizontal plane in the oven in the center and are uniformly spaced, a film enters from the film inlet by adopting a straight line, is stretched by each group of stretching rollers in sequence and leaves from the film outlet, and the rotating speed of the stretching rollers is increased progressively in sequence along the advancing direction of the film.
2. The stretching apparatus for waterproof breathable films according to claim 1, wherein the number of said stretching rollers is 5 sets, and the rotation speed ratio therebetween is 1.15, 1.17 and 1.17, respectively.
3. The waterproof breathable film stretching apparatus of claim 1, wherein each set of stretching rollers comprises a driving roller and a pressing roller, wherein the driving roller is a stainless steel roller, and the pressing roller is a rubber roller.
4. The waterproof breathable film stretching apparatus of claim 3, wherein the drive roll and the pressure roll are each 100 mm in diameter.
5. The waterproof breathable film stretching apparatus of claim 4, wherein the distance between two adjacent sets of stretching rollers is 20 mm.
6. The stretching device for waterproof breathable films according to claim 1, wherein an air suction hood is arranged in the oven and is positioned above the stretching roller to serve as the air suction opening.
7. The waterproof breathable film stretching device of claim 1, further comprising a preheating roller set and a sizing roller set, wherein the preheating roller set is arranged before the film inlet, and the sizing roller set is arranged after the film outlet.
8. The stretching device for waterproof breathable films according to claim 7, wherein a first guide roller is arranged between the preheating roller set and the film inlet, and a second guide roller is arranged between the film outlet and the shaping roller set.
9. The waterproof breathable film stretching device of claim 8, wherein the preheating roller set and the sizing roller set each comprise three hollow rollers and two pressing rollers, the three hollow rollers are arranged in an inverted isosceles triangle, and the two pressing rollers press against the hollow rollers on both sides.
10. The stretching device of claim 9, wherein the first guide roller, the second guide roller and the hollow roller have heat conducting oil flowing through the inner cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911338124.XA CN110936593A (en) | 2019-12-23 | 2019-12-23 | Waterproof ventilated membrane stretching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911338124.XA CN110936593A (en) | 2019-12-23 | 2019-12-23 | Waterproof ventilated membrane stretching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110936593A true CN110936593A (en) | 2020-03-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911338124.XA Pending CN110936593A (en) | 2019-12-23 | 2019-12-23 | Waterproof ventilated membrane stretching device |
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| CN (1) | CN110936593A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114536726A (en) * | 2022-02-24 | 2022-05-27 | 宁波长阳科技股份有限公司 | Film longitudinal stretching device and film longitudinal stretching method |
| CN115008713A (en) * | 2022-06-02 | 2022-09-06 | 宿迁市金田塑业有限公司 | Preparation process and automatic production line of low-precipitation type antifogging film |
-
2019
- 2019-12-23 CN CN201911338124.XA patent/CN110936593A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114536726A (en) * | 2022-02-24 | 2022-05-27 | 宁波长阳科技股份有限公司 | Film longitudinal stretching device and film longitudinal stretching method |
| CN114536726B (en) * | 2022-02-24 | 2023-11-07 | 宁波长阳科技股份有限公司 | Film longitudinal stretching device and film longitudinal stretching method |
| CN115008713A (en) * | 2022-06-02 | 2022-09-06 | 宿迁市金田塑业有限公司 | Preparation process and automatic production line of low-precipitation type antifogging film |
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