A film penetrating structure for a pvdc co-extrusion film stress relief device
By employing six heating rollers arranged in an S-shape with double vertical planes and an automated film-passing structure in the production of PVDC co-extruded film, the problems of internal stress accumulation and the risk of scalding have been solved, achieving safe and efficient film transfer and increasing production line speed.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LUOYANG SUNWAY TECH CO LTD
- Filing Date
- 2025-07-17
- Publication Date
- 2026-07-31
AI Technical Summary
The existing PVDC co-extruded film production process suffers from internal stress accumulation, which prevents the production line from increasing its speed. Furthermore, the film threading process is fraught with the risk of burns and takes a long time.
A film-threading structure for a stress relief device of PVDC co-extruded film was designed. It adopts six heating rollers arranged in an S-shape with double vertical planes. The automated film-threading without contact with the high-temperature heating rollers is achieved through the film-threading roller, guide roller and traction component. The combination structure of film clamping rod and traction component ensures stable film transmission.
This achieves a safe and efficient film-threading process, avoids burns, shortens film-threading time, and improves production efficiency.
Smart Images
Figure CN224576131U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of PVDC co-extruded film production technology, and in particular to a film-penetrating structure for a PVDC co-extruded film stress relief device. Background Technology
[0002] Polyvinylidene chloride (PVDC) co-extruded films are widely used in high-requirement packaging fields such as food and pharmaceuticals due to their excellent barrier properties (oxygen and moisture barrier). However, during the extrusion molding process, when the PVDC layer is co-extruded with a non-polar substrate (such as PE or PP), the significant difference in their coefficients of thermal expansion (PVDC: 1×10⁻⁶) can lead to problems. -4 / ℃; PE: 2×10 -4 During the cooling stage, uneven shrinkage is likely to occur. In addition, PVDC undergoes secondary crystallization in the temperature range of 60-80℃, and the molecular chain orientation caused by the melt flow rate gradient in the extrusion process, together with the formation of significant internal stress in the PVDC co-extruded film.
[0003] Currently, the industry commonly uses a two-roll heat setting process to eliminate internal stress in PVDC films. This process typically sets the temperature of the first heating roll (preheating roll) to 20-25℃ (slightly higher than the glass transition temperature of PVDC, Tg≈17℃), with a linear speed of 8-12 m / min to initiate molecular chain relaxation. The second heating roll (setting roll) is heated to 55-60℃, with a speed 1-2% faster than the first heating roll, to promote the release of deep stress. However, this existing technology suffers from a technical bottleneck: the production line speed cannot be increased.
[0004] To address this, the applicant developed a six-roller heat setting process with an S-shaped double vertical plane arrangement. This process breaks through the technical bottleneck of the double-roller heat setting process, which cannot increase the production line speed. However, the six-roller heat setting process with an S-shaped double vertical plane arrangement is more difficult than the double-roller heat setting process, especially the heat setting operation after film breakage during production. At this time, due to the high temperature of the heating rollers, hot hands often occur, which not only poses certain safety hazards, but also has the problem of long heat setting time.
[0005] Therefore, we designed a film-passing structure for a stress relief device of PVDC co-extruded film for a six-roller heat setting process with an S-shaped double vertical plane arrangement. Utility Model Content
[0006] In order to overcome the shortcomings of the prior art, this utility model discloses a membrane-penetrating structure for a PVDC co-extruded membrane stress relief device.
[0007] To achieve the above objectives, the present invention adopts the following technical solution: A film-passing structure for a stress relief device for PVDC co-extruded film includes a machine body. The machine body has six heating rollers arranged in an S-shaped double vertical plane on its inner side. Each heating roller has a film-passing wheel rotatably sleeved on both ends of its shaft, and the diameter of the film-passing wheel is larger than the diameter of the heating roller. The inner side wall of the machine body is provided with an upper guide wheel and a lower guide wheel arranged at intervals above and below the outer area of the heating roller; The film-threading wheel, upper guide wheel and lower guide wheel on the same side are together wound with traction components, and a film clamping rod is detachably connected between the two traction components.
[0008] Furthermore, the film-piercing wheel, the upper guide wheel, and the lower guide wheel are all sprockets; the traction component is a chain.
[0009] Further, the clamping rod includes: Two clamping rods, each with a semi-circular stud at its end, are used to clamp the ends of the PVDC co-extruded double-layer film after splicing. The threaded sleeve is screwed onto the two semi-circular studs after splicing and connected to the fixing stud on the inside of the chain.
[0010] Furthermore, the fixing stud is fixedly installed in the middle of the outer plate surface of the inner chain plate.
[0011] Furthermore, the film-threading wheel, the upper guide wheel, and the lower guide wheel are all thread wheels, and the traction component is a pulling rope.
[0012] Further, the clamping rod includes: Two clamping rods, each with a semi-circular stud at its end, are used to clamp the ends of the PVDC co-extruded double-layer film after splicing. A threaded sleeve is screwed onto the two semi-circular studs after they are joined together. The assembled semi-circular stud is located inside the threaded sleeve and is tied to the lead wire on the pulling rope.
[0013] Furthermore, one of the clamping rods has a groove on its splicing surface, and the other clamping rod has a protruding ridge that matches the groove on its splicing surface.
[0014] Furthermore, the protruding ridge is made of a flexible material.
[0015] Furthermore, a traction roller is also provided on the inner side of the machine body below the heating roller; both shaft ends of the traction roller are also fitted with film-penetrating wheels.
[0016] Compared with the prior art, the beneficial effects of this utility model are: 1. By adopting this film-threading structure, the entire operation can be completed by the operator from the side of the machine. The operator does not need to come into contact with the high-temperature heating roller area to complete the film-threading operation. This not only avoids the occurrence of burns to the hands during manual film-threading operations, but also greatly shortens the film-threading time. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the traction component surrounding the present invention; Figure 3 This is another schematic diagram of the traction component in this utility model. Figure 4 This is a schematic diagram of the traction component and the clamping rod in this utility model; Figure 5 This is an exploded structural diagram of the traction component and clamping rod in this utility model; Figure 6 This is an exploded structural diagram of another structure of the traction component and clamping rod in this utility model.
[0018] In the diagram: 1. Machine body; 2. Heating roller; 3. Film threading roller; 4. Upper guide roller; 5. Lower guide roller; 6. Traction component; 61. Fixing stud; 62. Lead wire; 7. Film clamping rod; 71. Clamping rod; 711. Groove; 712. Raised ridge; 72. Semi-circular stud; 73. Threaded sleeve; 8. Traction roller. Detailed Implementation
[0019] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if terms such as "upper", "lower", "front", "rear", "left", "right" indicate orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention. It should be understood that if terms such as "end", "side", "end portion", "side part", "lateral", "longitudinal", etc. indicate orientation or positional relationship, they are only corresponding to the length and width of the corresponding component. That is, "end" indicates the head and tail area in the length direction of the corresponding component, and "side part" indicates the head and tail area in the width direction of the corresponding component. They are used for the convenience of describing the present invention and do not indicate or imply that the device or element referred to must have a specific orientation.
[0020] Example 1, in conjunction with Appendix Figure 1-2 A film-passing structure for a stress relief device for PVDC co-extruded film includes a machine body 1, with six heating rollers 2 arranged in an S-shaped double vertical plane on the inner side of the machine body 1.
[0021] Each heating roller 2 has a film-threading wheel 3 rotatably mounted on both shaft ends, and the diameter of the film-threading wheel 3 is larger than the diameter of the heating roller 2; as needed, the diameter of the film-threading wheel 3 is 1.1-1.2 times that of the heating roller 2.
[0022] As needed, the inner side of the film-threading wheel 3 can be fixed to the shaft head of the heating roller 2 by bearings and a base sleeve. That is, the base sleeve is fixedly installed on the shaft head of the heating roller 2, and the base sleeve and the film-threading wheel 3 are interference-fitted with bearings.
[0023] The inner wall of the machine body 1 is provided with an upper guide wheel 4 and a lower guide wheel 5 arranged at intervals on the outer side of the heating roller 2; The film-threading wheel 3, the upper guide wheel 4, and the lower guide wheel 5 on the same side are all wound around the traction member 6, and the two traction members 6 are detachably connected to the film clamping rod 7.
[0024] It should be noted that the winding direction of the traction component 6 corresponding to the heating roller 2 is consistent with the transmission direction of the PVDC co-extruded film in the heating roller 2.
[0025] In this embodiment, the film-piercing wheel 3, the upper guide wheel 4, and the lower guide wheel 5 are all sprockets; the traction component 6 is a chain.
[0026] In this embodiment, the membrane clamping rod connection structure is as follows: Combined with appendix Figure 4-5 The clamping rod 7 consists of two clamping rods 71 and a threaded sleeve 73. The semi-circular studs 72 at the ends of the two clamping rods 71 are spliced together to form a complete screw.
[0027] The threaded sleeve 73 is screwed into the spliced part to form a complete screw rod, and is also welded to the middle of the inner chain plate of the chain and fixed to the chain by the fixing stud 61.
[0028] It should be noted that: there may be only one fixing stud 61 on the chain, or there may be multiple fixing studs 61 spaced apart.
[0029] In use, first, splice the two clamping rods 71, clamping the ends of the PVDC co-extruded double-layer film during the splicing process. Then, fully install the threaded sleeve 73 onto the spliced, complete screw. At this point, align the spliced, complete screw with the fixing stud 61 on the chain, and rotate the threaded sleeve 73 in the opposite direction so that the threaded sleeve 73 is simultaneously installed on the fixing stud 61. Subsequently, pull the two chains synchronously, causing the fixing stud 61 to pass over the six heating rollers 2 in sequence.
[0030] As needed, one clamping rod 71 has a protruding ridge 712 on its splicing surface, such as PVC material with a Shore hardness of 70A, and the other clamping rod 71 has a matching groove 711. This can effectively ensure that the end of the PVDC co-extruded double-layer film will not come out of the clamping rod 7.
[0031] Example 2, in conjunction with Appendix Figure 6 A film-piercing structure for a PVDC co-extruded film stress relief device differs from Embodiment 1 in that the film-piercing wheel 3, the upper guide wheel 4, and the lower guide wheel 5 are replaced with threaded wheels instead of sprockets, and the traction component 6 is replaced with a pulling rope instead of a chain.
[0032] At the same time, the fixing stud 61 in the middle of the inner chain plate is changed to the lead wire 62 fixed on the pull rope; by using the lead wire 62 to bind the complete screw formed after splicing, a detachable connection is achieved. At this time, the threaded sleeve 73 plays the role of preventing the lead wire 62 binding ring from moving axially and coming out of the complete screw formed after splicing.
[0033] As needed, the inner end of the lead wire 62 can be braided onto the pull rope and fixed to the pull rope by binding.
[0034] When the lead wire 62 is fixed to the pull rope by binding, the pull rope can be knotted near the lead wire 62 to prevent the lead wire 62 from moving along the pull rope.
[0035] It should be noted that the chain may have only one lead wire 62, or it may have multiple lead wires 62 spaced apart.
[0036] It should be noted that the spools are spools with grooves on both the rim surface and the spool.
[0037] In other embodiments, in conjunction with the appendix Figure 3 The traction roller 8 is located on the inner side of the machine body 1 below the heating roller 2; both shaft heads are also fitted with film-passing wheels 3.
[0038] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the above embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims in this utility model, and no reference numerals in the claims should be regarded as limiting the content of the claims.
Claims
1. A film threading structure for a PVDC co-extruded film stress relief device comprising a body (1), characterised in that: The inner side of the machine body (1) is provided with six heating rollers (2) arranged in an S-shaped double vertical plane. Each heating roller (2) has a film-passing wheel (3) rotatably sleeved on both shaft ends, and the diameter of the film-passing wheel (3) is larger than the diameter of the heating roller (2). The inner wall of the machine body (1) is provided with an upper guide wheel (4) and a lower guide wheel (5) arranged at intervals above and below the outer area of the heating roller (2). The film-piercing wheel (3), upper guide wheel (4) and lower guide wheel (5) on the same side are together wound around the traction member (6), and the two traction members (6) are detachably connected to the film clamping rod (7).
2. A membrane threading structure for a PVDC co-extruded film stress relief device according to claim 1, characterized in that: The film-piercing wheel (3), the upper guide wheel (4) and the lower guide wheel (5) are all sprockets; the traction component (6) is a chain.
3. A membrane threading structure for a PVDC co-extruded film stress relief device according to claim 2, characterized in that: The clamping rod (7) includes: Two clamping rods (71) are provided with semi-circular studs (72) at their ends, which are used to clamp the ends of the PVDC co-extruded double-layer film after splicing; The threaded sleeve (73) is screwed onto the two semi-circular studs (72) after splicing, and connected to the fixing stud (61) on the inside of the chain.
4. A membrane threading structure for a PVDC co-extruded film stress relief device according to claim 3, characterized in that: The fixing stud (61) is fixedly installed in the middle of the outer plate of the inner chain plate.
5. A membrane threading structure for a PVDC co-extruded film stress relief device according to claim 1, characterized in that: The film-threading wheel (3), the upper guide wheel (4) and the lower guide wheel (5) are all thread wheels, and the traction component (6) is a pulling rope.
6. A membrane threading structure for a PVDC co-extruded film stress relief device according to claim 5, characterized in that: The clamping rod (7) includes: Two clamping rods (71) are provided with semi-circular studs (72) at their ends, which are used to clamp the ends of the PVDC co-extruded double-layer film after splicing; The threaded sleeve (73) is screwed onto the two semi-circular studs (72) after splicing; The assembled semi-circular stud (72) is located inside the threaded sleeve (73) and is tied to the lead wire (62) on the pulling rope.
7. The membrane threading structure for a PVDC co-extruded film stress relief device according to claim 3 or 6, characterized in that: One of the clamping rods (71) has a groove (711) on its splicing surface, and the other clamping rod (71) has a protrusion (712) that matches the groove on its splicing surface.
8. A membrane piercing structure for a PVDC co-extruded film stress relieving device according to claim 7, characterized in that: The protruding ridge (712) is made of flexible material.
9. A membrane piercing structure for a PVDC co-extruded film stress relieving device according to claim 1, characterized in that: The inner side of the machine body (1) is also provided with a traction roller (8) below the heating roller (2); both shaft ends of the traction roller (8) are also fitted with film-passing wheels (3).