CN215359976U

CN215359976U - Polyimide film production line with hot and cold air box system

Info

Publication number: CN215359976U
Application number: CN202022288057.XU
Authority: CN
Inventors: 罗江荣; 闵功勋
Original assignee: Ningbo Yong Yong Photoelectric Technology Co ltd
Current assignee: Ningbo Yong Yong Photoelectric Technology Co ltd
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2021-12-31
Anticipated expiration: 2030-10-14

Abstract

The utility model relates to a polyimide film production line with a cold and hot air box system, which comprises a casting machine, a stretcher, a high-temperature imidization furnace, a heat setting oven and a winding machine, wherein the stretcher is a longitudinal stretcher connected with a transverse stretcher in front of and behind, or a transverse stretcher connected with a longitudinal stretcher in front of and behind, or a bidirectional synchronous stretcher, the air box system consisting of two cold air boxes and a hot air box is arranged behind the casting machine, the cold air boxes are arranged at one ends close to the casting machine and the stretcher, and a polyamic acid film at the casting machine passes through the air box system and then enters the stretcher. This production line has integrated a plurality of alternate arrangement's cold wind case and hot-blast case, has reduced the manufacturing cost of bellows, effectual reduction energy resource consumption. In addition, the number of the turning rollers can be increased in the improved production line, so that the number of times that the film enters the air box system after completing a single process is increased, different process requirements are met, and the space volume of the production line is greatly reduced.

Description

Polyimide film production line with hot and cold air box system

Technical Field

The utility model relates to a polyimide film manufacturing technology, in particular to a polyimide film production line with a cold and hot air box system.

Background

The polyimide film is a high polymer material with excellent properties such as high strength, high toughness, wear resistance, high temperature resistance, corrosion resistance and the like, is a main insulating material for manufacturing various middle-high grade electrical and electronic components, and is widely applied to the electrical and electronic industry.

With the development trend of light, thin, short, small and high-reliability design of downstream electronic products, films demanded in the market tend to be thinned, and meanwhile, higher requirements are put forward on the electrical, thermal, physical and other properties of polyimide films.

The conventional method for manufacturing a polyimide film at present is as follows: preparing polyimide precursor polyamic acid solution through polymerization reaction of dianhydride and diamine in a reaction kettle with dimethyl acetamide as solvent, salivating in a salivator to obtain self-supporting polyamic acid film, stretching in longitudinal and transverse directions, high temperature imidization, heat setting and winding. Polyimide film products manufactured by the prior art have poor electrical, thermal, physical and other properties, and particularly have low electrical strength modulus, high thermal shrinkage, high water absorption, high thermal expansion coefficient, high dielectric constant and the like.

Disclosure of Invention

The utility model aims to design a polyimide film production line with a hot and cold air box system, which is characterized in that a hot and cold air box is reformed on the basis of the prior production line, so that one air box system can finish the cold and hot treatment process of the whole polyimide film production line, and the space volume of the production line is greatly saved.

A polyimide film production line with a cold and hot air box system is an air box system formed by two cold air boxes and a hot air box in an alternating mode, the number of times that a film enters the air box system after completing a single process is increased by adding a steering roller, and the number of times of cold and hot alternate treatment processes is finally controlled.

The high-low temperature alternative treatment process for preparing the polyimide film adopts the polyamide acid solution to obtain the polyamide acid film with self-supporting property by tape casting, and then the polyamide acid film is rolled after longitudinal and transverse stretching, high-temperature imidization and heat setting; and (3) performing low-temperature and high-temperature alternate treatment on the polyamic acid self-supporting film obtained after casting, and then performing a stretching process, wherein the total times of the low-temperature and high-temperature treatment is 3-15, the polyamic acid self-supporting film subjected to casting is subjected to low-temperature treatment firstly, and the polyamic acid self-supporting film subjected to casting is also subjected to low-temperature treatment before the polyamic acid self-supporting film enters the stretching process.

Preferably, the low-temperature treatment temperature in the high-low temperature alternate treatment process of the polyamic acid self-supporting film obtained after casting is-60-250 ℃, the high-temperature treatment temperature is 100-160 ℃, and the low-temperature or high-temperature treatment time of the film is 0.05-1 min each time.

Preferably, the cold and hot air box system for performing the high-low temperature alternative treatment process in the production line is composed of two cold air boxes and one hot air box in an alternative mode.

Preferably, 2-16 transition rollers which are parallel to each other are arranged in each layer of the cold air box or the hot air box, the film entering the cold air box or the hot air box sequentially bypasses each transition roller, and the advancing process of the film on the section perpendicular to the center line of the roller is S-shaped.

Preferably, the temperature in the cold air boxes of each layer behind the casting machine, the longitudinal drawing machine, the transverse drawing machine, the bidirectional synchronous drawing machine and the heat setting oven is gradually decreased by 10-30% along with the distance from the winding machine, and the temperature in the hot air boxes of each layer is gradually increased by 10-30% along with the distance from the winding machine.

Preferably, the air inlets of the cold and hot air box system are arranged at the bottom of the cold and hot air box system, the air outlets of the cold and hot air box system are arranged at the top of the cold and hot air box system, and all layers of air box systems are separated by a heat insulation plate with gaps from top to bottom and are controlled to decrease the temperature of each layer of cold air box and increase the temperature of each layer of hot air box.

Compared with the prior art, the polyimide film production line with the cold and hot air box system has the advantages that:

1. the air box system integrates a plurality of alternately arranged cold air boxes and hot air boxes, reduces the manufacturing cost of the air boxes, and effectively reduces energy consumption because all high-low temperature treatment processes are concentrated in one air box system. 2. The times of passing polyimide through the air box system are increased, so that the times of high-low temperature treatment can be increased, and the whole production line is simpler to transform. 3. The air box system is separated by the heat insulation plate with the gap, the temperature of each layer is controlled to increase or decrease gradually, and the installation and the disassembly are convenient. 4. The space volume of the whole polyimide production line is greatly reduced.

Drawings

FIG. 1 is a schematic view of a polyimide film production line with a hot and cold air box system.

Fig. 2 is a schematic structural view of a cold air box and a hot air box alternately arranged in fig. 1.

The reference numbers in the figures are: 1. a film; 2. an inlet of a cold air box; 3. a cold air box; 4. a hot air box; 5. a hot air box inlet 6 and a film inlet; 7. a heat insulation plate; 8. an outlet of the cold air box; 9. a transition roller; 10. and an outlet of the hot air box.

Detailed Description

The polyimide film production line is shown in figure 1 and comprises a casting machine, a cold and hot air box system \ a longitudinal drawing machine, a cold and hot air box system, a transverse drawing machine, a cold and hot air box system, a high-temperature imidization furnace, a heat setting oven, a cold and hot air box system and a winding machine.

As shown in fig. 2, two cold air boxes 3 and two hot air boxes 4 are alternately arranged to form a cold and hot air box system.

In the embodiment, 7 mutually parallel transition rolling cylinders 9 are arranged in each cold air box 3 or hot air box 4, the film 1 entering the cold air box 3 or the hot air box 4 sequentially bypasses each transition rolling cylinder 9, the advancing process of the film 1 on the section vertical to the central line of the rolling cylinders is S-shaped, and the time of the film 1 in each cold air box 3 or hot air box 4 is 60 seconds.

The cold air box or the hot air box is a heat preservation box body, and both ends of the cold air box or the hot air box are respectively provided with a film inlet 6 and a film outlet.

The temperature of each layer of air boxes is controlled by the heat insulation plate 7 with the pores, and the temperature of each layer of cold air boxes is gradually increased and the temperature of each layer of hot air boxes is gradually decreased from bottom to top.

The temperature in the cold air box after the slobbering machine is-50 ℃, and the temperature in the hot air box is 120 DEG C

The temperature in the cold air box after the longitudinal drawing machine is-60 ℃, and the temperature in the hot air box is 145 ℃.

The temperature in the cold air box after the transverse drawing machine is-70 ℃, and the temperature in the hot air box is 175 ℃.

The temperature in the cold air box after the heat setting oven is-80 ℃, and the temperature in the hot air box is 210 ℃.

The preparation method of the polyimide film adopts the prior art for casting, longitudinal drawing, transverse drawing, imidization and heat setting, the solvent content of the polyamide acid film with self-supporting property obtained after casting is 32 percent, the longitudinal drawing ratio is 1.18, the transverse drawing ratio is 1.15, the drawing temperature is 200 ℃, the imidization temperature is 450 ℃, and the heat setting temperature is 280 ℃; the line speed was 8.0 m/min.

Claims

1. The utility model provides a polyimide film production line with hot and cold air box system, includes casting machine, stretcher, high temperature imidization stove, heat setting oven and rolling machine, the stretcher is for indulging the drawing machine in the front, its back connects horizontal drawing machine, or for violently drawing machine in the front, its back connects vertical drawing machine, or be two-way synchronous stretcher, its characterized in that: there are two air-cooling boxes and the bellows system that a hot-blast box constitutes behind the casting machine, the one end that the cold-cooling box is being close to casting machine and stretcher: the polyamic acid film at the casting machine firstly passes through the bellows system and then enters the stretcher.

2. The polyimide film production line with the hot and cold air box system according to claim 1, wherein: if the stretcher is a longitudinal stretcher, a transverse stretcher is connected behind the longitudinal stretcher, an air box system consisting of two cold air boxes and a hot air box is arranged behind the longitudinal stretcher, and the cold air boxes are arranged near the longitudinal stretcher and the transverse stretcher.

3. The polyimide film production line with the hot and cold air box system according to claim 2, wherein: the polyimide film production line enables the film conveying direction to be changed by 360 degrees through 2-3 turning rollers.

4. The polyimide film production line with the hot and cold air box system according to claim 2, wherein: the temperature in the cold air boxes of each layer behind the casting machine, behind the longitudinal drawing machine, behind the transverse drawing machine, behind the biaxial stretching machine and behind the heat setting oven is gradually decreased according to the gradient of 10-30% along with the distance between the cold air boxes and the winding machine, and the temperature in the hot air boxes of each layer is gradually increased according to the gradient of 10-30% along with the distance between the hot air boxes and the winding machine; the air inlet of the whole cold and hot air box system is arranged at the bottom, the air outlet is arranged at the top, and each layer of air box realizes the regulation and control of temperature through a heat insulation plate with pores.

5. The polyimide film production line with the hot and cold air box system according to claim 2, wherein: 2-16 parallel transition rollers are arranged in each layer of cold air box or hot air box, a film entering the cold air box or the hot air box bypasses each transition roller once, and the advancing process of the film on the section perpendicular to the central line of the rollers is S-shaped.