Intermittent water-blocking fully-dry optical cable and manufacturing method therefor

Abstract

An intermittent water-blocking fully-dry optical cable and a manufacturing method. The intermittent water-blocking fully-dry optical cable comprises a loose tube (1), and an optical fiber assembly (2) and water blocking units (3) located in the loose tube (1). A plurality of water blocking units (3) are provided, and the plurality of water blocking units (3) are distributed at intervals along an axial direction of the optical cable. Each water blocking unit (3) is of a cylindrical structure formed by crimping and connecting water blocking tape segments, and the water blocking units (3) are wrapped around the optical fiber assembly (2).

Description

An intermittent water-blocking fully dry optical cable and its manufacturing method Technical Field

[0001] The present application relates to the technical field of optical fiber and cable manufacturing, and in particular to an intermittent water-blocking fully dry optical cable and a manufacturing method thereof. Background Art

[0002] During the manufacturing process of fully dry-type loose tube optical cables, continuous water-blocking powder, water-blocking yarn, or water-blocking tape is typically used to block water inside the loose tube. When using continuous water-blocking tape, the tape is longitudinally wrapped around the outside of the optical fiber ribbon and enters the loose tube at the same time as the optical fiber ribbon.

[0003] The optical fiber ribbon is usually twisted into a loose tube, and the water-blocking tape is passively followed into the loose tube. During this process, the optical fiber ribbon rotates inside the loose tube with the water-blocking tape.

[0004] If the water-blocking tape contacts and adheres to the melted loose sleeve in advance, the accumulated stress cannot be released in time, and the rotating water-blocking tape will rotate slightly with the loose sleeve, causing wrinkles on the sleeve surface and poor appearance of the sleeve.

[0005] The rotating water-blocking tape tends to return to its straight state due to its own stress, which creates lateral pressure on the optical fiber ribbon. This continuous lateral pressure acts on the optical fibers, causing the four corner fibers of the optical fiber ribbon to be stressed and increase transmission loss.

[0006] Therefore, how to shield the continuous torsion of the water-blocking tape, eliminate the continuous stress accumulation, and improve the stress environment of the optical unit has become an urgent problem to be solved.

[0007] Summary of the Invention

[0008] The embodiments of the present application provide an intermittently water-blocking, fully dry optical cable and a manufacturing method thereof, so as to solve the problem in the related art that when the water-blocking tape and the molten loose tube come into contact and adhere to each other in advance, the stress accumulation cannot be released in time, and the rotating water-blocking tape will slightly rotate with the loose tube, resulting in wrinkles on the surface of the tube and poor appearance of the tube.

[0009] In a first aspect, an intermittent water-blocking, fully dry optical cable is provided, comprising a loose tube and an optical fiber assembly and a water-blocking unit located within the loose tube;

[0010] There are multiple water-blocking units, and the multiple water-blocking units are distributed at intervals along the axial direction of the optical cable. The water-blocking unit is a tubular structure formed by curling and connecting water-blocking tape segments, and the water-blocking unit is wrapped around the optical fiber assembly.

[0011] In some embodiments, the water blocking unit is fixed to the inner wall of the loose tube.

[0012] In some embodiments, hot melt adhesive is provided on the water blocking unit, the water blocking unit is fixed to the inner wall of the loose tube by the hot melt adhesive, and the water blocking tape segments are bonded by the hot melt adhesive to form the water blocking unit.

[0013] In some embodiments, the softening point of the hot melt adhesive is between 75°C and 90°C;

[0014] And / or, the hot melt adhesive forms a ring structure on the water blocking unit, or the hot melt adhesive forms a linear structure on the water blocking unit;

[0015] And / or, the optical fiber assembly is an optical fiber ribbon, or a plurality of twisted optical fibers.

[0016] In some embodiments, the water-blocking unit includes a water-blocking material and at least two stacked layers of water-blocking base fabrics, wherein two adjacent layers of water-blocking base fabrics are connected to form a receiving area, and the water-blocking material is located in the receiving area.

[0017] In some embodiments, the water-blocking material includes water-blocking powder and an adhesive resin mixed in the water-blocking powder.

[0018] In some embodiments, the adhesive resin is acrylic resin or polyurethane resin.

[0019] In a second aspect, a method for manufacturing the intermittent water-blocking, fully dry optical cable as described above is provided, comprising the following steps:

[0020] Rotate and release the optical fiber assembly;

[0021] Segmenting the water-blocking tape to form water-blocking tape segments, and intermittently wrapping each of the water-blocking tape segments around the optical fiber assembly to form a water-blocking unit, thereby obtaining a combined body;

[0022] The assembly is forced through an extruder and, after cooling, a loose tube is formed on the assembly.

[0023] In some embodiments, the water-blocking tape comprises a plurality of water-blocking tape segments, a perforation line is provided between two adjacent water-blocking tape segments, and the perforation line is parallel to the short side of the water-blocking tape;

[0024] The water-blocking tape is provided with hot-melt adhesive for bonding water-blocking tape segments to form water-blocking units. The hot-melt adhesive is applied on the long sides of the water-blocking tape, or the hot-melt adhesive is applied on the perforated lines.

[0025] In some embodiments, the direction of the water-blocking tape is the same as the direction of the optical fiber assembly, or the direction of the water-blocking tape is perpendicular to the direction of the optical fiber assembly.

[0026] The beneficial effects of the technical solution provided by this application include:

[0027] The full dry type optical cable provided by the embodiment of the present application has an intermittent water blocking structure formed therein, which is specifically a plurality of water blocking units, and a plurality of the water blocking units are distributed at intervals along the axial direction of the optical cable, and the water blocking units are in a tubular structure and wrapped around the optical fiber assembly. Because the water blocking unit is a tubular structure formed by curling and connecting water blocking tape segments, and the water blocking unit and the water blocking unit are distributed at intervals, so that the two adjacent water blocking units are equivalent to forming a force unloading area, each water blocking unit can independently carry out water blocking, even if a water blocking unit contacts and adheres to the molten loose tube in advance, the rotating water blocking unit rotates slightly with the loose tube, but because of the existence of the force unloading area, the rotational stress generated by the water blocking unit to the loose tube can be avoided from being accumulated backward on the stress generated by the next water blocking unit to the loose tube, that is, it is difficult to produce continuous torsion between the water blocking unit and the water blocking unit, and then the continuous stress accumulation of the water blocking unit to the loose tube is eliminated, thereby avoiding the problem of wrinkles and poor appearance of the loose tube surface, reducing the influence on the cooling forming of the loose tube.

[0028] At the same time, since the water-blocking tape is divided into multiple spaced water-blocking units, water-blocking materials can be saved to a certain extent. For example, by optimizing the spacing of the water-blocking units, more than 60% of water-blocking materials can be saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] FIG1 is a schematic diagram of an intermittent water-blocking, fully dry optical cable provided in an embodiment of the present application;

[0031] FIG2 is a schematic diagram of a water-blocking unit provided in an embodiment of the present application (the hot melt adhesive is in a ring-shaped structure);

[0032] FIG3 is a schematic diagram of a water-blocking unit provided in an embodiment of the present application (the hot melt adhesive is in a linear structure);

[0033] FIG4 is a schematic diagram of a water-blocking tape provided in an embodiment of the present application;

[0034] FIG5 is a schematic diagram of a production method of an intermittent water-blocking, fully dry optical cable provided in an embodiment of the present application;

[0035] FIG6 is a schematic diagram of a longitudinally wrapped segmentation device provided in an embodiment of the present application;

[0036] FIG7 is a schematic diagram of another production method of an intermittent water-blocking, fully dry optical cable provided in an embodiment of the present application;

[0037] FIG8 is a schematic diagram of an optical fiber ribbon stack provided in an embodiment of the present application;

[0038] FIG9 is a schematic diagram of an assembly provided in an embodiment of the present application.

[0039] In the figure: 1. Loose tube; 2. Fiber optic assembly; 3. Water-blocking unit; 4. Hot melt adhesive; 5. Water-blocking tape; 6. Assembly; 7. Extruder; 8. Punching line; 9. Twisting cage; 10. Tape-joining mold; 11. Longitudinal wrapping and segmenting device; 12. Preforming mold; 13. Shaping mold; 14. Cutting robot. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0041] The embodiments of the present application provide an intermittently water-blocking, fully dry optical cable, which can solve the problem in the related art that when the water-blocking tape and the molten loose tube come into contact and adhere prematurely, the stress accumulation cannot be released in time, and the rotating water-blocking tape will slightly rotate with the loose tube, resulting in wrinkles on the surface of the tube and poor appearance of the tube.

[0042] Referring to Figures 1, 2 and 3, an embodiment of the present application provides an intermittent water-blocking, fully dry optical cable, which includes a loose tube 1 and an optical fiber assembly 2 and a water-blocking unit 3 located in the loose tube 1; wherein, there are multiple water-blocking units 3, and the multiple water-blocking units 3 are distributed at intervals along the axial direction of the optical cable, and the water-blocking unit 3 is a tubular structure formed by curling and connecting water-blocking tape segments, and the water-blocking unit 3 is wrapped around the optical fiber assembly 2.

[0043] The fully dry optical cable provided in an embodiment of the present application has an intermittent water-blocking structure formed therein, specifically a plurality of water-blocking units 3, and the plurality of water-blocking units 3 are distributed at intervals along the axial direction of the optical cable, and the water-blocking units 3 are cylindrical in structure and wrapped around the optical fiber assembly 2. Since the water-blocking unit 3 is a tubular structure formed by curling and connecting water-blocking tape segments, and the water-blocking units 3 and the water-blocking units 3 are distributed at intervals, a force-unloading region is formed between the two adjacent water-blocking units 3. Each water-blocking unit 3 can independently perform water-blocking. Even if one water-blocking unit 3 contacts and adheres to the molten loose tube in advance, the rotating water-blocking unit 3 rotates slightly with the loose tube. However, due to the presence of the force-unloading region, the rotational stress generated by the water-blocking unit 3 on the loose tube can be prevented from being accumulated backward onto the stress generated by the next water-blocking unit 3 on the loose tube. That is, it is difficult to generate continuous torsion between the water-blocking units 3 and the water-blocking units 3, thereby eliminating the continuous stress accumulation of the water-blocking unit 3 on the loose tube, thereby avoiding the problem of wrinkles on the surface of the loose tube and the poor appearance of the tube, and reducing the influence on the cooling molding of the loose tube.

[0044] At the same time, since the water-blocking tape is divided to form a plurality of spaced water-blocking units 3, water-blocking materials can be saved to a certain extent. For example, by optimizing the spacing of the water-blocking units 3, more than 60% of water-blocking materials can be saved.

[0045] In the present application, the optical fiber assembly 2 may be an optical fiber ribbon or a plurality of twisted optical fibers.

[0046] For the optical fiber ribbon, since the water-blocking units 3 of this application are spaced apart, even if the rotating water-blocking ribbon is subjected to its own stress, it tends to return to a straight state. The lateral pressure exerted on the optical fiber ribbon is not continuous, thereby reducing the lateral pressure exerted on the four corner fibers of the optical fiber ribbon, improving the stress environment of the optical unit, and reducing transmission loss.

[0047] In order to prevent the water blocking unit 3 from moving inside the loose tube 1 , the present application fixes the water blocking unit 3 to the inner wall of the loose tube 1 .

[0048] Specifically, the water blocking unit 3 is provided with hot melt adhesive 4 , the water blocking unit 3 is fixed to the inner wall of the loose tube 1 by the hot melt adhesive 4 , and the water blocking tape segments are bonded by the hot melt adhesive 4 to form the water blocking unit 3 .

[0049] It can be seen that the hot melt adhesive 4 plays two roles. On the one hand, it bonds the water blocking tape segments to form a cylindrical water blocking unit 3 , and on the other hand, it fixes the water blocking unit 3 to the inner wall of the loose tube 1 .

[0050] As shown in Figure 1, the optical fiber ribbon is spirally placed in the loose tube 1. The water blocking unit 3 is intermittently attached to the inside of the loose tube 1. After the loose tube 1 cools down, the hot melt adhesive 4 on one side of the water blocking unit 3 is bonded to the loose tube 1 to ensure that it does not move inside the loose tube.

[0051] The softening point of the hot melt adhesive 4 is between 75 and 90° C., and it is in a melting state between 160 and 180° C.

[0052] In fact, the hot melt adhesive 4 has at least two forms on the water blocking unit 3. For example, as shown in FIG. 2 , the hot melt adhesive 4 forms a ring structure on the water blocking unit 3 , or as shown in FIG. 3 , the hot melt adhesive 4 forms a linear structure on the water blocking unit 3 .

[0053] Specifically, referring to Figure 4, the rolled-up water-blocking tape 5 includes a plurality of water-blocking tape segments, and a perforation line 8 is provided between two adjacent water-blocking tape segments to facilitate disassembly so as to be intermittently wrapped around the optical fiber assembly 2. The perforation line 8 is parallel to the short side of the water-blocking tape 5.

[0054] There are at least two ways to provide the hot melt adhesive 4 on the water blocking tape 5:

[0055] Method 1: As shown in FIG. 4 , hot melt adhesive 4 is coated on the long side of the water-blocking tape 5 .

[0056] When the production method shown in FIG5 is adopted, the direction of the water-blocking tape 5 is made the same as that of the optical fiber assembly 2 . At this time, the hot melt adhesive 4 forms a linear structure on the water-blocking unit 3 as shown in FIG3 .

[0057] When the production method shown in FIG. 7 is adopted, the direction of the water-blocking tape 5 is perpendicular to the direction of the optical fiber assembly 2 . At this time, the hot melt adhesive 4 forms a ring structure on the water-blocking unit 3 as shown in FIG. 2 .

[0058] Method 2: The hot melt adhesive 4 is coated on the perforated lines 8 .

[0059] When the production method shown in FIG5 is adopted, the direction of the water-blocking tape 5 is made the same as that of the optical fiber assembly 2 . At this time, the hot melt adhesive 4 forms a ring structure on the water-blocking unit 3 as shown in FIG2 .

[0060] When the production method shown in FIG. 7 is adopted, the direction of the water-blocking tape 5 is perpendicular to the direction of the optical fiber assembly 2 . At this time, the hot melt adhesive 4 forms a linear structure on the water-blocking unit 3 as shown in FIG. 3 .

[0061] It should be noted that the material of the hot melt adhesive can be commonly used materials.

[0062] The water-blocking unit 3 includes a water-blocking material and at least two layers of stacked water-blocking base fabrics, wherein two adjacent layers of water-blocking base fabrics are connected to form a receiving area, and the water-blocking material is located in the receiving area.

[0063] The water-blocking material includes water-blocking powder and a bonding resin mixed in the water-blocking powder. The bonding resin firmly bonds the water-blocking powder to the water-blocking base fabric, so that after the water-blocking unit 3 absorbs water, the water-blocking powder is unlikely to be carried away by water pressure.

[0064] There are many options for the adhesive resin. For example, as an example, the adhesive resin uses acrylic resin or polyurethane resin.

[0065] 5 , 6 and 7 , an embodiment of the present application further provides a method for manufacturing an intermittent water-blocking, fully dry optical cable, which comprises the following steps:

[0066] 101: Rotate and release the optical fiber assembly 2.

[0067] As an example, for an optical fiber ribbon, the optical fiber ribbon is released from the twisting cage 9 and stacked into an optical fiber ribbon stack through the ribbon splicing die 10. The twisting cage 9 drives the optical fiber ribbon and the ribbon splicing die 10 to rotate, so that the optical fiber ribbon stack is rotated and released.

[0068] As shown in FIG8 , if the number of optical fiber ribbons is n, the width is w1, and the thickness is t1, then the equivalent diameter of the optical fiber ribbon stack is d1.

[0069] And d1=[w1 2 +(n×t1) 2 ] 1 / 2 .

[0070] Since the parameters n, w1, and t1 related to the optical fiber ribbon can be determined in advance, the equivalent diameter of the optical fiber ribbon stack can be calculated as d1.

[0071] 102 : Segment the water-blocking tape 5 to form water-blocking tape segments, and intermittently wrap each of the water-blocking tape segments around the optical fiber assembly 2 to form a water-blocking unit 3 , thereby obtaining an assembly 6 .

[0072] In which, the water-blocking tape 5 includes multiple water-blocking tape segments, and a perforation line 8 is set between two adjacent water-blocking tape segments, and the perforation line 8 is parallel to the short side of the water-blocking tape 5; the water-blocking tape 5 is provided with a hot melt adhesive 4 for bonding the water-blocking tape segments and forming a water-blocking unit 3, and the hot melt adhesive 4 is applied on the long side of the water-blocking tape 5, or the hot melt adhesive 4 is applied on the perforation line 8.

[0073] The water-blocking tape 5 is actively released and enters the longitudinal wrapping segmentation device 11, where it is intermittently longitudinally wrapped around the periphery of the optical fiber ribbon stack.

[0074] 9 , the width of the water-blocking unit 3 when unfolded is w2, the thickness is t2, and the equivalent diameter of the assembly 6 is d2. d2 = d1 + 3 × t2. w2 = m × π × d2.

[0075] Since the parameters w2 and t2 related to the water-blocking tape can be determined in advance, the equivalent diameter of the assembly 6 can be calculated as d2.

[0076] Wherein, m is the water-blocking unit width magnification coefficient, which means that in order to bond the water-blocking tape segments and form the water-blocking unit 3, there needs to be an overlapping area at both ends of the water-blocking tape segments, as shown in the dotted box in Figure 9. Therefore, its width is lengthened and magnified to enable the smooth formation of this overlapping area. The value range is 1.5 to 2.5.

[0077] 103: The assembly 6 is driven through the extruder 7 and after cooling, a loose tube 1 is formed on the assembly 6.

[0078] The inner hole of the extruder head die of the extruder 7 is D1, and the inner hole of the loose tube 1 is d3. D1 = d2 + k.

[0079] Among them, k is the mold enlargement size, and its value range is 1 to 3 mm. The purpose of setting this mold enlargement size k is to increase k on the basis of the equivalent diameter d2, to ensure that the assembly 6 can be extruded smoothly, while avoiding large friction between the loose sleeve and the inner hole of the extruder head mold, which may cause mold damage.

[0080] Since the equivalent diameter d2 of the assembly 6 is known, k can be assigned a value within a range of values, thereby obtaining the inner hole of the extruder head die of the extruder 7 as D1.

[0081] In addition, as shown in FIG9 , the width w2 of the water blocking unit 3 also satisfies the following formula: w2=π×d3+p.

[0082] p is the width of the overlapping area of ​​the waterblocking tape segments, ranging from 1 to 5 mm. The purpose of setting this overlapping area width p is to ensure that the waterblocking tape segments can form a complete closed loop and avoid the waterblocking tape segments from forming a closed loop due to thermal shrinkage, wrinkling, etc. during the production process.

[0083] Since m is calculated from the magnification angle, and p is calculated from the size of the actual overlapping area, the values ​​of w2, m, and p can be obtained by combining w2=m×π×d2 and w2=π×d3+p, as well as the value ranges of m and p.

[0084] As shown in FIG6 , the longitudinal wrapping and segmenting device 11 includes a preforming die 12 , a shaping die 13 and a cutting robot 14 .

[0085] The water-blocking tape is actively released with a tension of 1 to 5N, becomes a semicircular shape after passing through the preforming die 12, is heated to 100 to 120°C after passing through the shaping die 13, and is curled into shape after the hot melt adhesive softens, and is bonded into a cylindrical shape. Finally, it is segmented from the punching line 8 by the cutting robot 14 and tightly wrapped around the outer periphery of the optical fiber ribbon.

[0086] The water-blocking unit 3 enters the molten loose tube material. Because the loose tube material is in a molten state and has an internal temperature between 180 and 220°C, the hot melt adhesive on the side of the water-blocking unit 3 melts and expands inside the loose tube. When the loose tube cools, it naturally adheres to the inner wall of the loose tube, ultimately forming an intermittently water-blocked, fully dry optical cable.

[0087] As shown in FIG. 5 , the direction of the water-blocking tape 5 is the same as the direction of the optical fiber assembly 2 , or as shown in FIG. 7 , the direction of the water-blocking tape 5 is perpendicular to the direction of the optical fiber assembly 2 .

[0088] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0089] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0090] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. An intermittent water-blocking fully dry optical cable, characterized in that: It comprises a loose tube (1), and an optical fiber assembly (2) and a water blocking unit (3) located in the loose tube (1); There are a plurality of water-blocking units (3), and the plurality of water-blocking units (3) are distributed at intervals along the axial direction of the optical cable; the water-blocking unit (3) is a tubular structure formed by curling and connecting water-blocking tape segments; and the water-blocking unit (3) is wrapped around the optical fiber assembly (2).

2. The intermittent water-blocking fully dry optical cable according to claim 1, characterized in that: The water blocking unit (3) is fixed to the inner wall of the loose tube (1).

3. The intermittent water-blocking fully dry optical cable according to claim 2, characterized in that: The water blocking unit (3) is provided with a hot melt adhesive (4), the water blocking unit (3) is fixed to the inner wall of the loose tube (1) by means of the hot melt adhesive (4), and the water blocking tape segments are bonded by means of the hot melt adhesive (4) to form the water blocking unit (3).

4. The intermittent water-blocking fully dry optical cable according to claim 3, characterized in that: The softening point of the hot melt adhesive (4) is between 75 and 90°C; And / or, the hot melt adhesive (4) forms a ring structure on the water blocking unit (3), or the hot melt adhesive (4) forms a linear structure on the water blocking unit (3); And / or, the optical fiber assembly (2) is an optical fiber ribbon, or a plurality of twisted optical fibers.

5. The intermittent water-blocking fully dry optical cable according to claim 1, characterized in that: The water-blocking unit (3) comprises a water-blocking material and at least two layers of water-blocking base fabrics arranged in a stacked manner, wherein two adjacent layers of water-blocking base fabrics are connected to form a receiving area, and the water-blocking material is located in the receiving area.

6. The intermittent water-blocking fully dry optical cable according to claim 5, characterized in that: The water-blocking material includes water-blocking powder and an adhesive resin mixed in the water-blocking powder.

7. The intermittent water-blocking fully dry optical cable according to claim 6, characterized in that: The bonding resin is acrylic resin or polyurethane resin.

8. A method for manufacturing an intermittent water-blocking fully dry optical cable as claimed in claim 1, characterized in that: It includes the following steps: Rotating and releasing the optical fiber assembly (2); The water blocking tape (5) is segmented to form water blocking tape segments, and each of the water blocking tape segments is intermittently wrapped around the optical fiber assembly (2) to form a water blocking unit (3), thereby obtaining a combined body (6); The assembly (6) is driven through an extruder (7) and after cooling, a loose tube (1) is formed on the assembly (6).

9. The method for manufacturing an intermittent water-blocking fully dry optical cable according to claim 8, characterized in that: The water blocking tape (5) comprises a plurality of water blocking tape segments, a perforation line (8) is arranged between two adjacent water blocking tape segments, and the perforation line (8) is parallel to the short side of the water blocking tape (5); The water blocking tape (5) is provided with hot melt adhesive (4) for bonding water blocking tape segments to form water blocking units (3); the hot melt adhesive (4) is applied on the long sides of the water blocking tape (5), or the hot melt adhesive (4) is applied on the perforated lines (8).

10. The method for manufacturing an intermittent water-blocking fully dry optical cable according to claim 8, characterized in that: The direction of the water blocking tape (5) is the same as the direction of the optical fiber assembly (2), or the direction of the water blocking tape (5) is perpendicular to the direction of the optical fiber assembly (2).

Images