CN201677481U

CN201677481U - Production equipment of EVA copolymer package film

Info

Publication number: CN201677481U
Application number: CN2010202110855U
Authority: CN
Inventors: 徐维军
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-05-25
Filing date: 2010-05-25
Publication date: 2010-12-22
Anticipated expiration: 2020-05-25

Abstract

The utility model discloses a production device of EVA diaphragms used for photovoltaic battery package. Through the additional arrangement of a heating radiation device between a mold opening of an extrusion flat mold and a cooling forming roller, diaphragms going out from the flat mold are firstly heated, and then carry out process processing such as subsequent forming traction rolling and the like, so the unidirectional stretching is generated in a specific temperature range, the opening degree of a flat mold head can be increased, the thickness of the diaphragms is determined according to a certain stretching ratio, and the stress memory is eliminated by temperature in the stretching process so that the diaphragms can realize proper interlinking to reach the high-speed production of low-contraction hot sol. The utility model has the advantages of low equipment cost, simple production process, capability of greatly improving the yield and the like.

Description

A kind of production equipment of EVA copolymer packaging film

Technical field

The utility model relates to the production equipment of plastic cement diaphragm, the production equipment of particularly a kind of EVA copolymer photovoltaic cell packaging bag.

Background technology

At present, the production of EVA (ethylene-vinyl acetate copolymer) diaphragm is mainly extrudes curtain coating or extrusion calendaring production, sees accompanying drawing 1.Main component is that the raw material of EVA is melt state by the extruder plasticizing, and making melt forming by flat molds 1 then is sheet 2, finishes the production of diaphragm again by technologies such as the cold roller 4 typing traction rollings of follow-up silica gel pressure roller 3 embossing.

General curtain coating or the extrusion calendaring extruded produced plastic film and is actually a kind of simple tension method, and promptly going out die orifice at melt has stretching between cold roller, and thin more diaphragm stretches many more, the diaphragm thickness that obtains to require by cold roller speed and melt outflow speed difference.Because PUR characteristics such as EVA, the stretching after the depanning are the main causes that thermal contraction produces.

Owing to contain crosslinking agents such as peroxide in the photovoltaic cell packaging EVA diaphragm composition, in order to prevent cross-linking reaction in advance, adopt existing processes and equipment to determine EVA diaphragm extrusion plasticizing could carry out smoothly down at the low temperature (80-90 ℃) of strictness, low temperature means that fluidity of molten descends.

For the EVA diaphragm of application such as photovoltaic cell encapsulation, percent thermal shrinkage is a very important index, and general the requirement is below 5%, and percent thermal shrinkage is low more favourable more for application such as postorder photovoltaic cell encapsulation.

At present, PUR diaphragm manufacturer such as EVA takes method to mainly contain in order to reach the percent thermal shrinkage index:

1. adopt the methods such as stretching reduce behind the mould to reach the minimizing percent thermal shrinkage, for this reason, have to wait and control diaphragm thickness by reducing mould die lip aperture.The method causes to make and extrudes back pressure and heighten, and energy consumption heightens, and fluidity of molten further descends, and has seriously reduced production efficiency; And make the control of mould and extruder temperature that difficulty take place.

2. adopt stress in the method elimination process that adds tempering destressing device after the film typing, reduce thermal contraction.The method extends production line greatly, and equipment cost significantly increases; And the indexs such as planarization of tempering caudacoria are difficult to control; Feasibility is doubtful.

Summary of the invention

The production equipment of the EVA that can also boost productivity when the purpose of this utility model is to provide a kind of percent thermal shrinkage that can effectively reduce the EVA film.

For achieving the above object, the utility model adopts following scheme: a kind of equipment of the EVA of production copolymer packaging film, comprise flat molds, silica gel pressure roller, the cold roller of embossing, described silica gel pressure roller is mutually circumscribed with the cold roller of embossing, described flat molds is positioned at the top of silica gel pressure roller and the cold roller of embossing, it is characterized in that: between the tangent place of silica gel pressure roller and the cold roller of embossing heater is set in described flat molds exit.

Cold roller of described embossing and silica gel pressure roller are crossed the tangent line at its common point of contact on the diaphragm that flows out, and described heater is arranged between flat molds exit to cold roller of embossing and the tangent place of silica gel pressure roller.

Described heater is arranged on the outside of the cold roller of embossing between the diaphragm of described EVA copolymer and the cold roller of embossing contact position to cold roller of embossing and the tangent place of silica gel pressure roller.

The beneficial effects of the utility model are:

1. under the equal speed of production, shrinkage factor descends.Can accomplish to shrink≤2%.

2. compare with no drawing process, under the equal shrinkage factor, because line speed is accelerated, single machine yield increases greatly.

3. compare with the later stage tempering process, production line shortens dramatically, and reduces the production loss, reduces equipment cost.

4. compare with the later stage tempering process, Yin Jiawen can not produce problems such as planarization before typing, can not destroy the embossing effect that needs yet.

5. can make diaphragm realize appropriate hot glue chain, solidify the diaphragm intermolecular distance, eliminate film stretching Memorability such as EVA, reduce even the elimination thermal contraction.

Description of drawings

Accompanying drawing 1: prior art is produced the schematic diagram of EVA film device and flow process;

Accompanying drawing 2: heater is arranged on production EVA membrane production equipment and the schematic flow sheet on the intersecting lens of silica gel pressure roller and the cold roller of embossing;

Accompanying drawing 3: heater is arranged on melt and the cold roller contact wire of embossing to production EVA membrane production equipment and schematic flow sheet between cold roller of embossing and silica gel pressure roller tangent line;

Description of reference numerals: 1-flat molds, 2-EVA diaphragm, 3-silica gel pressure roller.The cold roller of 4-embossing, the 5-heater

The specific embodiment

Embodiment 1

As shown in Figure 2, the production equipment of EVA copolymer packaging film described in the utility model comprises flat molds 1, silica gel pressure roller 3, the cold roller 4 of embossing, the cold roller of silica gel pressure roller 3 and embossing 4 is mutually circumscribed, the circle center line connecting level of the cold roller 4 of silica gel pressure roller 3 and embossing, flat molds 1 be positioned at silica gel pressure roller 3 and the cold roller 4 of embossing tangent place directly over, the tangent line of crossing cold roller 4 of embossing and silica gel pressure roller 3 common point of contacts is on diaphragm 2, the die lip of flat molds 1 to the distance of the tangent line mutually of the cold roller 4 of silica gel pressure roller 3 and embossing is about 350mm, in flat molds 1 die lip to the both sides of diaphragm between the phase tangent line of silica gel pressure roller 3 and the cold roller 4 of embossing exothermal infrared device 5 is installed; Diaphragm 2 remains on about 100 ℃ by the temperature of heater 5, it is good that the flowability of diaphragm 2 keeps, and effectively raises production efficiency, for this reason, the corresponding aperture that increases the die orifice of flat molds 1, the corresponding simultaneously velocity of rotation that improves silica gel pressure roller 3 and the cold roller 4 of embossing.

Production procedure of the present utility model: the raw material that with main component is EVA (ethylene-vinyl acetate copolymer) is melt state by extruder (not drawing among the figure) plasticizing; The melt of above-mentioned EVA copolymer is shaped to diaphragm 2 by flat molds 1; Diaphragm 2 passes firing equipment 5 earlier carries out the production that technology such as cold roller 4 typing traction rollings of follow-up silica gel pressure roller 3 embossing is finished packaging film after heating again.

Embodiment 2

As shown in Figure 3, the production equipment of EVA copolymer packaging film described in the utility model comprises flat molds 1, silica gel pressure roller 3, the cold roller 4 of embossing, the cold roller of silica gel pressure roller 3 and embossing 4 is mutually circumscribed, the cold roller 4 circle center line connecting levels of silica gel pressure roller 3 and embossing, flat molds 1 is positioned at the top of the cold roller 4 of embossing, in diaphragm 2 and the cold roller of embossing 4 contact positions to embossing between cold roller 4 and the silica gel pressure roller 3 tangent places outside of the cold roller 4 of embossing infrared heating device 5 is installed; Diaphragm 2 makes the flowability of diaphragm 2 keep good by the heating of heater 5, effectively raises production efficiency, for this reason, increases the aperture of the die orifice of flat molds 1 accordingly, the corresponding simultaneously velocity of rotation that improves silica gel pressure roller 3 and the cold roller 4 of embossing.

Production procedure of the present utility model: the raw material that with main component is EVA (ethylene-vinyl acetate copolymer) is melt state by extruder (not drawing among the figure) plasticizing; The melt of EVA copolymer is shaped to diaphragm 2 by flat molds 1; Diaphragm 2 flow to space heating and the embossing that enters behind the cold roller 4 of embossing between heater 5 and the cold roller 4 of embossing, carries out the production that technology such as cold roller 4 typing traction rollings of follow-up silica gel pressure roller 3 embossing is finished diaphragm again.

Above embodiment only is not intended to limit in order to the explanation the technical solution of the utility model, and the specific embodiment of the present utility model is made amendment or the part technical characterictic is equal to replacement; And not breaking away from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.

Claims

1. equipment of producing the EVA copolymer packaging film, comprise flat molds (1), silica gel pressure roller (3), the cold roller of embossing (4), described silica gel pressure roller (3) is mutually circumscribed with the cold roller of embossing (4), described flat molds (1) is positioned at the top of silica gel pressure roller (3) and the cold roller of embossing (4), it is characterized in that: between the tangent place of silica gel pressure roller (3) and the cold roller of embossing (4) heater (5) is set in described flat molds (1) exit.

2. according to the equipment of the EVA copolymer packaging film of the described production of claim 1, it is characterized in that: cold roller of described embossing (4) and silica gel pressure roller (3) are crossed the tangent line at its common point of contact on the diaphragm (2) that flows out, and described heater (5) is arranged between flat molds (1) exit to cold roller of embossing (4) and the tangent place of silica gel pressure roller (3).

3. the equipment of production according to claim 1 EVA copolymer packaging film is characterized in that: described heater (5) is arranged on the outside of the cold roller of embossing (4) between the diaphragm (2) of described EVA copolymer and the cold roller of embossing (4) contact position to cold roller of embossing (4) and the tangent place of silica gel pressure roller (3).