A PVB film forming cooling mechanism
The PVB film forming cooling mechanism, which combines a frame-type cooling plate with multiple hot air blowers, solves the problems of insufficient temperature control and airflow regulation in the existing technology, realizes gradient cooling and airflow control of PVB film, and reduces the risk of internal stress and mechanical damage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG DUOLI PLASTIC CO LTD
- Filing Date
- 2025-08-11
- Publication Date
- 2026-07-03
AI Technical Summary
The cooling devices of existing blown film machines cannot achieve gradient temperature control and wind speed regulation, which causes PVB films to generate internal stress, wrinkles and cracks during the cooling process, and high-speed airflow may damage the film surface.
The system combines a frame-type cooling plate with multiple hot air blowers (60℃, 40℃ and 25℃), and uses air inlet ducts and valves to achieve gradient temperature control and airflow regulation, avoiding damage to the PVB membrane caused by temperature differences and high-speed airflow.
Gradient cooling of the PVB membrane is achieved, reducing internal stress, lowering the risk of membrane wrinkles and cracks, and protecting the integrity of the membrane surface.
Smart Images
Figure CN224446569U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of PVB film forming and cooling technology, specifically a PVB film forming and cooling mechanism. Background Technology
[0002] A blown film machine is a device that heats and melts plastic particles and then blows them into a thin film. Therefore, the blown film machine needs to go through a cooling and shaping process before it can be wound up.
[0003] For example, patent CN214927055U discloses a blown film forming cooling device for producing packaging bag films. This patent includes a support; a cooling blower shell, which is annular in structure, with the central axis of the annular structure extending vertically. Multiple cooling blower shells are arranged sequentially on the support at intervals. Multiple air outlets are evenly distributed on the inner circumferential wall of the cooling blower shell, and an air inlet is provided on the outer circumferential wall. This patent uses an annular cooling blower shell and a single blower to supply air through a ventilation pipe, cooling the cylindrical film through the annular air outlets. However, a single blower cannot achieve gradient temperature control. During the cooling process from high to low temperature, the film is prone to internal stress due to sudden cooling, leading to defects such as wrinkles and cracks. Furthermore, the lack of precise control over airflow speed means that high-speed airflow may cause physical damage to films with low tensile strength. Therefore, considering the characteristics of planar films such as PVB films, there is an urgent need for a forming cooling mechanism that can achieve gradient cooling and adjustable airflow speed. Utility Model Content
[0004] The purpose of this invention is to provide a PVB film forming cooling mechanism to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a PVB film forming cooling mechanism, comprising a frame-shaped cooling plate and a frame-shaped air duct inside the frame-shaped cooling plate, and a plurality of air outlet holes communicating with the frame-shaped air duct are evenly provided on the upper and lower inner walls of the frame-shaped cooling plate, an air inlet pipe is connected to the side wall of the frame-shaped cooling plate, and a hot air device is connected to the other end of the air inlet pipe, at least one frame-shaped cooling plate is provided, and a valve is provided on the air inlet pipe.
[0006] Preferably, the frame-shaped cooling plate is provided with three parts, and the hot air devices are respectively a first hot air blower, a second hot air blower and a third hot air blower. The frame-shaped cooling plate is connected to the first hot air blower, the second hot air blower and the third hot air blower through air inlet pipes.
[0007] Preferably, the rated temperatures of the first hot air blower, the second hot air blower, and the third hot air blower are 60°C, 40°C, and 25°C, respectively.
[0008] Preferably, the frame-type cooling plate, the first hot air blower, the second hot air blower, and the third hot air blower can all be detachably installed on the base at the lower end.
[0009] Compared with the prior art, the beneficial effects of this utility model are:
[0010] 1. Achieve gradient temperature control and reduce internal stress: Three frame-type cooling plates are connected to three independent hot air blowers (rated temperatures of 60℃, 40℃ and 25℃ respectively) to gradually cool the PVB film, avoiding stress concentration inside the film due to excessive temperature difference, and effectively reducing the risk of film wrinkles and cracks.
[0011] 2. Precisely control the air speed to protect the integrity of the membrane surface: The valve on the air inlet duct can adjust the air outlet speed to avoid high-speed airflow causing wrinkles, stretching deformation or tearing of the PVB membrane with low tensile strength, effectively protecting the flatness of the membrane surface. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of this utility model;
[0013] Figure 2 This is a cross-sectional structural diagram of the present invention.
[0014] In the diagram: 1. Frame-type cooling plate; 11. Air outlet; 2. Air inlet pipe; 21. Valve; 3. First hot air blower; 4. Second hot air blower; 5. Third hot air blower; 6. Base. Detailed Implementation
[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0016] Please see Figure 1-2 This utility model provides a technical solution: a PVB film forming cooling mechanism, including a frame-shaped cooling plate 1 and a frame-shaped air duct inside the frame-shaped cooling plate 1, and a plurality of air outlet holes 11 that communicate with the frame-shaped air duct are evenly provided on the upper and lower inner walls of the frame-shaped cooling plate 1. An air inlet pipe 2 is connected to the side wall of the frame-shaped cooling plate 1, and a hot air device is connected to the other end of the air inlet pipe 2. At least one frame-shaped cooling plate 1 is provided, and a valve 21 is provided on the air inlet pipe 2.
[0017] Furthermore, the frame-type cooling plate 1 is provided with three components, and the hot air devices are respectively a first hot air blower 3, a second hot air blower 4, and a third hot air blower 5. The frame-type cooling plate 1 is connected to the first hot air blower 3, the second hot air blower 4, and the third hot air blower 5 through the air inlet pipe 2. By setting up three frame-type cooling plates 1 to perform gradient cooling of the PVB film, the internal stress caused by rapid cooling is reduced, and the risk of film wrinkles and cracks is lowered.
[0018] Furthermore, the rated temperatures of the first hot air blower 3, the second hot air blower 4, and the third hot air blower 5 are 60℃, 40℃, and 25℃, respectively. The PVB membrane is at a relatively high temperature (usually 70-90℃, close to its softening point) when it comes out of the forming mechanism. It is cooled by the airflow gradient to avoid excessive temperature difference that could lead to stress concentration inside the membrane and reduce the risk of cracking and wrinkling.
[0019] Furthermore, the frame-type cooling plate 1, the first hot air blower 3, the second hot air blower 4, and the third hot air blower 5 can all be detachably installed on the base 6 at the lower end.
[0020] Specifically, the PVB film exits the forming mechanism and passes through three frame-shaped cooling plates 1 in sequence. Simultaneously, the power is connected to turn on the first hot air blower 3, the second hot air blower 4, and the third hot air blower 5. The hot air from the first hot air blower 3, the second hot air blower 4, and the third hot air blower 5 enters the frame-shaped air duct inside the frame-shaped cooling plate 1 through the air inlet pipe 2, and exits through the air outlet 11. Gradual air blowing cooling is performed on the upper and lower surfaces of the PVB film to reduce the internal stress caused by sudden cooling and reduce the risk of film wrinkles and cracks.
[0021] Furthermore, the airflow speed is controlled by adjusting valve 21. Due to the low tensile strength of PVB membranes, high-speed airflow may cause wrinkles, stretching deformation, or even tearing of the membrane surface. By controlling the airflow speed, the impact force of the airflow on the membrane surface can be reduced, protecting the flatness of the membrane surface and avoiding mechanical damage.
[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A PVB film forming cooling mechanism, comprising a frame-shaped cooling plate (1) and a frame-shaped air duct inside the frame-shaped cooling plate (1), wherein a plurality of air outlet holes (11) communicating with the frame-shaped air duct are evenly provided on the upper and lower inner walls of the frame-shaped cooling plate (1), and an air inlet pipe (2) is connected to the side wall of the frame-shaped cooling plate (1), and a hot air device is connected to the other end of the air inlet pipe (2), characterized in that: At least one frame-type cooling plate (1) is provided, and a valve (21) is provided on the air inlet pipe (2).
2. The PVB film forming and cooling mechanism according to claim 1, wherein: The frame-type cooling plate (1) is provided with three units, and the hot air devices are respectively the first hot air blower (3), the second hot air blower (4) and the third hot air blower (5). The frame-type cooling plate (1) is connected to the first hot air blower (3), the second hot air blower (4) and the third hot air blower (5) through the air inlet pipe (2).
3. The PVB film forming and cooling mechanism according to claim 2, characterized in that: The rated temperatures of the first hot air blower (3), the second hot air blower (4) and the third hot air blower (5) are 60℃, 40℃ and 25℃, respectively.
4. The PVB film forming and cooling mechanism of claim 2, wherein: The frame-type cooling plate (1), the first hot air blower (3), the second hot air blower (4) and the third hot air blower (5) can all be detachably installed on the base (6) at the lower end.