CN108394080B

CN108394080B - Distributor structure for preparing multilayer CPP film

Info

Publication number: CN108394080B
Application number: CN201810371093.7A
Authority: CN
Inventors: 张建林
Original assignee: Suzhou Rongdaxin New Material Technology Co ltd
Current assignee: Suzhou Rongdaxin New Material Technology Co ltd
Priority date: 2018-04-24
Filing date: 2018-04-24
Publication date: 2021-10-12
Anticipated expiration: 2038-04-24
Also published as: CN108394080A

Abstract

In order to solve the problem that the co-extrusion of a plurality of CPP films is difficult to realize because the current distributor has uneven distribution technology, especially when the single-layer CPP film is lower than 15um, the invention provides a distributor structure for preparing the multi-layer CPP film, which adopts a mode of multiple distribution cones for distributing and converging again, so that the polypropylene molten liquid can be uniformly distributed, and the thickness of each layer of CPP film can reach 5 um-15 um. Therefore, the original single-layer CPP film can be replaced by the multi-layer CPP film, and the material cost is not increased.

Description

Distributor structure for preparing multilayer CPP film

Technical Field

The invention relates to processing equipment of an aluminum-plastic composite film, in particular to a distributor structure for producing a multilayer CPP film in the aluminum-plastic composite film.

Background

In general, an aluminum-plastic composite film is a composite material composed of an outer nylon layer, an intermediate aluminum foil layer and an inner heat-sealing layer, wherein the layers are bonded through an adhesive. However, the lithium ion battery may have leakage of corrosive liquid or hydrofluoric acid during use, the inner heat-sealing layer of the common aluminum-plastic composite film is easily penetrated by the corrosive liquid or the hydrofluoric acid to cause short circuit, the inner heat-sealing layer of the common aluminum-plastic composite film is easily penetrated by the corrosive liquid or the hydrofluoric acid because the inner heat-sealing layer of the aluminum-plastic composite film is mainly a CPP film, the CPP film is a cast polypropylene film and has the characteristics of a thermoplastic polymer material, and in the production and processing processes, residues are carried out in a certain link of mechanical equipment due to incomplete plasticization of raw materials or extrusion and circulation processes, or the raw materials are decomposed in advance due to dead corners of a flow channel or excessively high friction temperature, so that 'fish eyes' can be generated; or the local plasticizing temperature is too high, so that a shiny white light spot, namely a so-called 'crystal point', appears on the surface of the film, the connection between the CPP film and the whole body of the CPP film at the position of the 'fish eye' or the 'crystal point' is not completely closed, and the corrosion liquid or hydrofluoric acid is easy to permeate from the 'fish eye' or the 'crystal point' when the part is relatively weak.

In order to solve the problem, the conventional method in the industry is to add an anti-corrosion treatment layer between an intermediate layer aluminum foil layer and an inner layer heat-sealing layer of an aluminum-plastic composite film, and the anti-corrosion treatment layer is combined with the aluminum foil layer and the inner layer hot air layer through an adhesive.

However, if a corrosion-resistant treatment layer is added, not only is the material cost increased, that is, an additional corrosion-resistant layer is added, but also an adhesive with a corrosion-resistant effect is preferably used; this also increases the cost of the process, since the addition of a tie layer requires the addition of at least one additional adhesive application line, which is relatively costly and relatively inefficient.

In view of this, it is proposed to replace a single-layer CPP film with a multi-layer CPP film in the aluminum-plastic composite film industry, which has the advantage that due to the physical characteristics of the CPP itself, the probability of generating "fish-eyes" or "crystal points" is relatively small, and if the CPP is stacked in multiple layers, the probability of hydrofluoric acid or corrosive liquid passing through all CPP films is greatly reduced. However, the current distributor has uneven flow distribution technology, and especially when the single-layer CPP film layer is lower than 15um, the single-layer CPP film layer is difficult to be uniformly distributed, so that the co-extrusion of the multi-layer CPP film layer is difficult to realize.

Disclosure of Invention

In order to solve the above problems, the present invention provides a dispenser structure for preparing a multilayer CPP film, which can uniformly distribute a polypropylene melt and make the thickness of each CPP film reach 5um to 15 um. Therefore, the original single-layer CPP film can be replaced by the multi-layer CPP film, and the material cost is not increased.

A dispenser structure for producing a multilayer CPP film, comprising: raw materials import (10), reposition of redundant personnel awl (11, 12, 14, 15), shunt tubes (111, 112, 114, 115), center tube (113), current-limiting awl (13), its characterized in that: at least two shunting cones (11, 12) are sequentially and concentrically sleeved on a central tube (113), wherein one end of a first shunting cone (11) is connected with a raw material inlet (10), the other section of the first shunting cone (11) is concentrically nested at one end of a second shunting cone (12), each time the fluid passes through one shunting cone (11, 12, 14, 15), the fluid is divided into more than or equal to 2 symmetrical strands and is transmitted along the axial direction through the shunting tubes (111, 112, 114, 115), a flow limiting cone (13) is sleeved at the tail end of the central tube (113), the fluid passing through the flow limiting cone (13) and the preceding shunting tubes (111, 114) can be combined to form a fluid I, the fluid passing through the flow limiting cone (13) and the preceding shunting tubes (112, 115) can be combined to form a fluid II, and the fluid I and the fluid II respectively enter the same layer of an extruder die head through the shunting tubes.

Furthermore, the shunting cones (11, 12, 14, 15) can be respectively and independently provided with shunting rings (16). The diverter ring (16) can fix the diverter cones (11, 12, 14, 15).

Further, the diameter of the central tube (113) is larger than that of the shunt tubes (111, 112, 114, 115).

Further, the fluid I and the fluid II can be divided after passing through the dividing cones (14, 15) respectively, and the divided liquids are conveyed to the same layer of the die head of the extruder.

Furthermore, the distributor structure for preparing the multilayer CPP film can divide the molten PP fluid into 2-20 parts; preferably, the molten PP fluid is divided into 3 to 12 parts.

By adopting the distributor structure for preparing the multilayer CPP film, the molten PP raw material is divided by at least two shunting cones (11, 12), and then is respectively and independently combined with the shunting pipes (111, 114) to form a fluid I and combined with the shunting pipes (112, 115) to form a fluid II, so that the fluid is more stable, the formula distribution is more uniform, the bottleneck that the existing CPP film is difficult to be thinner can be solved, and the multilayer ultrathin CPP film co-extrusion is realized.

Description of the drawings:

the embodiments are further described with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view showing a dispenser structure for preparing a multilayer CPP film according to embodiment 1.

Description of main components:

a raw material inlet 10; a first tap cone 11; a second skimmer cone 12; a current limiting cone 13; a tap cone 14; a spreader cone 15; a diverter ring 16; a shunt tube 111; a shunt tube 112; a center tube 113; a shunt tube 114; a shunt tube 115; a draft tube 211; a draft tube 212; a draft tube 213; a draft tube 214; a draft tube 215; draft tube 216

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

Specific embodiment example 1:

as shown in FIG. 1, there is a schematic diagram of a dispenser structure for preparing a multilayer CPP film, which includes: raw materials import (10), reposition of redundant personnel awl (11, 12, 14, 15), shunt tubes (111, 112, 114, 115), center tube (113), current-limiting awl (13), its characterized in that: two shunting cones (11, 12) are sequentially and concentrically sleeved on a central tube (113), wherein one end of the first shunting cone (11) is connected with a raw material inlet (10), the other section of the first shunting cone (11) is concentrically nested at one end of the second shunting cone (12), each time the fluid passes through one shunting cone (11, 12, 14, 15), the fluid is divided into 2 strands and is transmitted along the axial direction through a shunting tube (111, 112, 114, 115), a flow limiting cone (13) is sleeved at the tail end of the central tube (113), the fluid passing through the flow limiting cone (13) and the preceding shunting tubes (111, 114) can be combined into a strand of fluid I, the fluid passing through the flow limiting cone (13) and the preceding shunting tubes (112, 115) can be combined into a strand of fluid II, the fluid I and the fluid II can respectively pass through the shunting cones (14, 15) and then are shunted and enter the same layer of an extruder die head through the shunting tubes (211-216), six-layer co-extruded CPP films can be formed in this way. And the thickness of each layer can be 10 um.

Specific embodiment example 2:

a dispenser for preparing a multilayer CPP film, comprising: raw materials import (10), reposition of redundant personnel awl (11, 12, 14, 15), shunt tubes (111, 112, 114, 115), center tube (113), current-limiting awl (13), its characterized in that: two shunting cones (11, 12) are sequentially and concentrically sleeved on a central tube (113), wherein one end of the first shunting cone (11) is connected with a raw material inlet (10), the other section of the first shunting cone (11) is concentrically nested at one end of the second shunting cone (12), each time the fluid passes through one shunting cone (11, 12, 14, 15), the fluid is divided into 2 strands and is transmitted along the axial direction through a shunting tube (111, 112, 114, 115), a flow limiting cone (13) is sleeved at the tail end of the central tube (113), the fluid passing through the flow limiting cone (13) and the front shunting tube (111, 114) can be combined into a strand of fluid I, the fluid passing through the flow limiting cone (13) and the front shunting tube (112, 115) can be combined into a strand of fluid II, and the fluid I and the fluid II can respectively pass through the two shunting tubes to enter the same layer of an extruder die head, so that a two-layer CPP co-extruded film can be formed, and each layer is 12um thick.

Therefore, the distributor structure for preparing the multilayer CPP film can uniformly distribute the polypropylene molten liquid and enable the thickness of each layer of CPP film to reach 5-15 um. Therefore, the original single-layer CPP film can be replaced by the multi-layer CPP film, and the material cost is not increased.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A dispenser structure for producing a multilayer CPP film, comprising: raw materials import (10), reposition of redundant personnel awl (11, 12, 14, 15), shunt tubes (111, 112, 114, 115), center tube (113), current-limiting awl (13), its characterized in that: at least two shunting cones (11, 12) are sequentially and concentrically sleeved on a central pipe (113), wherein one end of a first shunting cone (11) is connected with a raw material inlet (10), the other section of the first shunting cone (11) is concentrically nested at one end of a second shunting cone (12), each time the fluid passes through one shunting cone (11, 12, 14, 15), the fluid is divided into more than two symmetrical streams which are transmitted along the axial direction through the shunting pipes (111, 112, 114, 115), a flow limiting cone (13) is sleeved at the tail end of the central pipe (113), and the fluid passing through the flow limiting cone (13) and the front shunt pipes (111, 114) are combined into a jet of fluid I, simultaneously, the fluid passing through the flow limiting cone (13) and the front shunt tubes (112, 115) are combined into a fluid II, and the fluid I and the fluid II respectively enter the same layer of the die head of the extruder through the flow guide tube; the fluid I and the fluid II can be divided after passing through the dividing cones (14 and 15) respectively, and the divided liquid is conveyed to the same layer of the die head of the extruder.

2. The dispenser structure for producing a multilayer CPP film according to claim 1, wherein: and shunt rings (16) are respectively and independently arranged on the shunt cones (11, 12, 14 and 15).

3. The dispenser structure for producing a multilayer CPP film according to claim 1, wherein: the diameter of the central tube (113) is larger than that of the shunt tubes (111, 112, 114, 115).

4. The dispenser structure for producing a multilayer CPP film according to claim 1, wherein: the distributor structure for preparing the multilayer CPP film divides the molten PP fluid into 2-20 parts.

5. The dispenser structure for producing a multilayer CPP film according to claim 1, wherein: the distributor structure for preparing the multilayer CPP film divides molten PP fluid into 3-12 parts.