CN102431141A - Method for cleaning extruding machine and die head of multilayer co-extrusion film blowing equipment - Google Patents
Method for cleaning extruding machine and die head of multilayer co-extrusion film blowing equipment Download PDFInfo
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- CN102431141A CN102431141A CN2011103275271A CN201110327527A CN102431141A CN 102431141 A CN102431141 A CN 102431141A CN 2011103275271 A CN2011103275271 A CN 2011103275271A CN 201110327527 A CN201110327527 A CN 201110327527A CN 102431141 A CN102431141 A CN 102431141A
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Abstract
The invention discloses a method for cleaning an extruding machine and a die head of multilayer co-extrusion film blowing equipment. The method comprises the following steps of: after the last batch of formulated products are produced by extruding the last batch of formulated materials out of all extruding machines respectively, adding new materials into corresponding extruding machines respectively to start cleaning the machine until the new materials clean the last batch of materials out of the extruding machine and the die head completely; and in the machine cleaning process, making the extrusion speeds of all the extruding machines continuously fluctuated and changed up and down by using a central controller, wherein the maximum extrusion speed of all the extruding machines at the highest speed reaches 1.4 to 1.8 times the normal extrusion speed of the extruding machine, but the sum of the extrusion speeds of all the extruding machines is kept constant at all time points in the machine cleaning process. In the method, an oscillating extrusion mode is used for all the extruding machines, so that the time consumed in the machine cleaning process is short, and a small number of raw materials are consumed.
Description
Technical field
The invention belongs to the technical field of multi-layer co-extruded blown film production technology, particularly a kind of extruder of multi-layer co-extruded blown film equipment and die head clear method.
Background technology
In the production process of multi-layer co-extruded blown film; Adopt many extruders to extrude different material melts; The material that each extruder is extruded gathers and extrudes jointly at die head; Formation has the circular membrane bubble of multilayer material, is enclosed with Compressed Gas so that form inflation in the film bubble, and film steeps through inflation, rolling after cooling.For multi-layer co-extruded blown film equipment, its production process has multiple different material prescription, when a kind of prescription is converted into another kind of prescription; Because fused materials viscosity; Need a transfer process, be detained material to last consignment of in extruder and the die head and thoroughly clear, replacement becomes new material fully; With the material that prevents last consignment of sneak into and influence the next group product and make the material of next group product or color influenced, above-mentioned cleaning transfer process is called " clear " again.
Traditional clear method is to extrude from each extruder respectively and after accomplishing the production of last consignment of prescription at the material of last consignment of prescription; New material is added extruder; The speed that each extruder is set when producing the last consignment of product is at the uniform velocity extruded new material; New material is released the last consignment of material in extruder and the die head, and promptly new material is replaced out with the last consignment of material.This clear mode of at the uniform velocity extruding can make film bubble hold in the continuation of insurance of clear process relaying that thickness is stable, film bubble extruded velocity keeps coordination with cooling velocity; Avoid clear process film follicular rupture, also can make the film bubble that produces in the clear process still can stably realize rolling.But, because melt in extruder and die head flow process, produces friction and viscous between melt and the flow path wall; Make the flowing velocity of runner middle part big, and slow near the melt flow rate of flow path wall, the material that newly affixes equates basically with the material that has just washed away and forms dynamic equilibrium; Sometimes form false wall 1 (as shown in Figure 1, the speed at this position of the longer expression of arrow is fast more among Fig. 1) even at flow path wall viscous one deck material, the existence of " false wall " phenomenon; Make the flow path wall surface be difficult to thoroughly effectively washed away; Therefore clear speed is very slow, needs about five hours usually, and the raw material consumption is big.
Summary of the invention
The extruder and the die head clear method that the objective of the invention is to overcome above-mentioned shortcoming and a kind of multi-layer co-extruded blown film equipment is provided, its clear process takes a short time, and it is few to expend raw material.
For realizing above-mentioned purpose; The extruder of the multi-layer co-extruded blown film equipment of the present invention and die head clear method may further comprise the steps: extrude from each extruder respectively and after accomplishing the production of last consignment of prescription at the material of last consignment of prescription; New material is added corresponding extruder respectively and begins clear, clear fully from extruder and die head until the delay material of new material with the last consignment of prescription; It is characterized in that in the clear process, the extruded velocity of each extruder adopts central controller controls; Central controller makes the conversion of constantly fluctuating up and down of the extruded velocity of each extruder, and the highest extruded velocity of each extruder when high speed reaches 1.4～1.8 times of normal extruded velocity of this extruder; But on each time point in the middle of the clear process, the summation of each extruder extruded velocity remains unchanged.The normal extruded velocity of a certain extruder is meant the normal extruded velocity of this extruder in extruding last consignment of material process.
The present invention has the following advantages and effect:
1, the present invention adopts the mode of extruding of shaking to each extruder; Therefore compare with traditional at the uniform velocity clear mode; The clear time can be shortened significantly; Save the required material of clear; This mainly contains two aspect reasons: (1), tradition are at the uniform velocity extruded in the clear mode; The velocity pressure of clear fluid remains a constant speed constant, forms the stable false wall of dynamic equilibrium; And the alternately fluctuation of up-down takes place in the speed of clear fluid of the present invention and pressure; Form turbulent flow; Next group material melt on flow path wall and the last consignment of of runner corner be detained material and initiate the concussion shock wave; Break the dynamic equilibrium of false wall, destroy false wall so more easily or be not easy to form and stablize false wall.(2), at the uniform velocity in the clear mode, the impulsive force of clear fluid remains unchanged tradition; At the uniform velocity the extruded velocity of clear is big and the maximum extruded velocity of clear mode of the present invention is than tradition, and the maximum erosion force rate tradition at the uniform velocity scouring force of clear is big, forms and acutely washes away, and this also helps reducing and washes away required time.(give an example; Suppose that the viscous force size that flow path wall certain is detained between material and the flow path wall is a; If adopt tradition at the uniform velocity the clear mode be merely 0.8a in the scouring force size that this place forms, then adopt clear mode of the present invention in the maximum erosion power of this place's formation just greater than a.For example possibly reach about 1.2a; Under above-mentioned situation; If adopt at the uniform velocity clear mode of tradition; Then need one section for a long time, could should be detained material and progressively wash away at leisure, in layer, from outside to inside, if but adopt clear mode of the present invention; Then just possibly make under this delay material monoblock full wafer ground ablation, so clear mode of the present invention can shorten the clear required time) in the moment of maximum erosion power.
2, the present invention is on each time point in the middle of the clear process, and the summation of each extruder extruded velocity remains unchanged, and therefore when each extruder adopts the speed change extrusion way, can guarantee that still the film bubble does not break.And it is constant to keep film bubble thickness and film to steep extruded velocity, and film bubble extruded velocity and cooling velocity maintenance are coordinated, and the film bubble is stable in the maintenance of clear process, continuity, the stability of whole process of production film bubble before and after the maintenance clear.
Description of drawings
Fig. 1 is traditional clear method velocity flow profile and produces false wall sketch map.
The specific embodiment
Embodiment one
A kind of extruder of nine layers of coextrusion film blowing equipment and die head clear method; This blown film equipment has A, B, C, D, E, F, G, H, nine extruders of I; May further comprise the steps: extrude from nine extruders respectively and after accomplishing the production of last consignment of prescription at the material of last consignment of prescription; New material is added each extruder respectively and begins clear, clear fully from extruder and die head until the delay material of new material with the last consignment of prescription; In the clear process, the extruded velocity of each extruder adopts central controller controls; Central controller makes the conversion of constantly fluctuating up and down of the extruded velocity of each extruder; The highest extruded velocity of each extruder when it reaches its high speed reaches 1.8 times of normal extruded velocity of this extruder; But on each time point in the middle of the clear process, the summation of the extruded velocity of nine extruders remains unchanged.
Specific as follows: in the clear process; Extruder A, extruder B and extruder C are divided into first group; Extruder D, extruder E and extruder F are divided into second group, and extruder G, extruder H, extruder I are divided into the 3rd group, and control is respectively organized the extruded velocity of extruder and remained unchanged.In each group, when wherein the extruded velocity of an extruder reached maximum (normally 1.8 times of extruded velocity), same group the extruded velocity of two extruders in addition was minimum of a value (normally 0.6 times of extruded velocity).Three extruders in same group reach maximum extruded velocity in turn.The extruded velocity of nine extruders all fluctuates between separately minimum extruded velocity value and maximum extruded velocity value.
Embodiment two
A kind of extruder of seven-layer co-extrusion blown film equipment and die head clear method; This blown film equipment has A, B, C, D, E, F, seven extruders of G; May further comprise the steps: extrude from seven extruders respectively and after accomplishing the production of last consignment of prescription at the material of last consignment of prescription; New material is added each extruder respectively and begins clear, clear fully from extruder and die head until the delay material of new material with the last consignment of prescription; In the clear process, the extruded velocity of each extruder adopts central controller controls; Central controller makes the conversion of constantly fluctuating up and down of the extruded velocity of each extruder; The highest extruded velocity of each extruder reaches 1.5 times of normal extruded velocity of this extruder; But on each time point in the middle of the clear process, the summation of the extruded velocity of seven extruders remains unchanged.
In the clear process, extruder A and extruder B are divided into first group, and extruder C and extruder D are divided into second group, and extruder E, extruder F, extruder G are divided into the 3rd group, and the extruded velocity summation that extruder is respectively organized in control remains unchanged.In first group, second group, when wherein the extruded velocity of an extruder reached maximum (normally 1.5 times of extruded velocity), the extruded velocity of another extruder of same group was minimum of a value (normally 0.5 times of extruded velocity); In the 3rd group, when wherein the extruded velocity of an extruder reaches maximum (normally 1.5 times of extruded velocity), same group the extruded velocity of two extruders in addition is minimum of a value (normally 0.75 times of extruded velocity).Each extruder of same group reaches the highest extruded velocity in turn.The extruded velocity of seven extruders all fluctuates between separately minimum extruded velocity value and maximum extruded velocity value.
Embodiment three
A kind of extruder of three-layer co-extruded blown film equipment and die head clear method; This blown film equipment has A, B, three extruders of C; May further comprise the steps: extrude from three extruders respectively and after accomplishing the production of last consignment of prescription at the material of last consignment of prescription; New material is added each extruder respectively and begins clear, clear fully from extruder and die head until the delay material of new material with the last consignment of prescription; In the clear process, the extruded velocity of each extruder adopts central controller controls; Central controller makes the conversion of constantly fluctuating up and down of the extruded velocity of each extruder; The highest extruded velocity of each extruder reaches 1.4 times of normal extruded velocity of this extruder; But on each time point in the middle of the clear process, the summation of the extruded velocity of each extruder remains unchanged.In the clear process, when wherein the extruded velocity of an extruder reached maximum (normally 1.4 times of extruded velocity), the extruded velocity of two extruders reached minimum of a value (normally 0.8 times of extruded velocity) in addition; Three extruders reach maximum extruded velocity in turn.The extruded velocity of three extruders all fluctuates between minimum extruded velocity value and maximum extruded velocity value.
Through actual measuring and calculating, the actual clear time of above-mentioned three embodiment was respectively 1.7 hours, 1.9 hours, 2 hours, reduced by about 2/3 time than traditional approach, saved about 2/3 raw material.
Claims (1)
1. the extruder of a multi-layer co-extruded blown film equipment and die head clear method; May further comprise the steps: extrude from each extruder respectively and after accomplishing the production of last consignment of prescription at the material of last consignment of prescription; New material is added corresponding extruder respectively and begins clear, clear fully from extruder and die head until the delay material of new material with the last consignment of prescription; It is characterized in that: in the clear process, the extruded velocity of each extruder adopts central controller controls; Central controller makes the conversion of constantly fluctuating up and down of the extruded velocity of each extruder, and the highest extruded velocity of each extruder when high speed reaches 1.4～1.8 times of normal extruded velocity of this extruder; And on each time point in the middle of the clear process, the summation of each extruder extruded velocity remains unchanged.
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| CN2011103275271A CN102431141B (en) | 2011-10-25 | 2011-10-25 | Method for cleaning extruding machine and die head of multilayer co-extrusion film blowing equipment |
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| CN2011103275271A CN102431141B (en) | 2011-10-25 | 2011-10-25 | Method for cleaning extruding machine and die head of multilayer co-extrusion film blowing equipment |
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| CN102431141A true CN102431141A (en) | 2012-05-02 |
| CN102431141B CN102431141B (en) | 2013-12-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111672837A (en) * | 2020-06-16 | 2020-09-18 | 三门核电有限公司 | Pipeline high-flow flushing method |
Citations (5)
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| FR2483843A1 (en) * | 1980-06-06 | 1981-12-11 | Serta Sa | Variable speed drive for blow moulding parison extruder - with electric and hydraulic motors linked via a variable output pump |
| JPS59131438A (en) * | 1983-01-17 | 1984-07-28 | Japan Steel Works Ltd:The | Color or material changing method in injection molding method |
| CN1822942A (en) * | 2003-07-17 | 2006-08-23 | 住友重机械工业株式会社 | Molding method, purging method, and molding machine |
| CN101821080A (en) * | 2007-09-10 | 2010-09-01 | 西德尔公司 | Process for forming containers, which comprises step of flushing the internal volume of the container of variable duration over at least one given compensation time |
| CN101973118A (en) * | 2010-09-20 | 2011-02-16 | 北京化工大学 | Method for cleaning PVC extruder by using rubber |
-
2011
- 2011-10-25 CN CN2011103275271A patent/CN102431141B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2483843A1 (en) * | 1980-06-06 | 1981-12-11 | Serta Sa | Variable speed drive for blow moulding parison extruder - with electric and hydraulic motors linked via a variable output pump |
| JPS59131438A (en) * | 1983-01-17 | 1984-07-28 | Japan Steel Works Ltd:The | Color or material changing method in injection molding method |
| CN1822942A (en) * | 2003-07-17 | 2006-08-23 | 住友重机械工业株式会社 | Molding method, purging method, and molding machine |
| CN101821080A (en) * | 2007-09-10 | 2010-09-01 | 西德尔公司 | Process for forming containers, which comprises step of flushing the internal volume of the container of variable duration over at least one given compensation time |
| CN101973118A (en) * | 2010-09-20 | 2011-02-16 | 北京化工大学 | Method for cleaning PVC extruder by using rubber |
Non-Patent Citations (1)
| Title |
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| 李浩: "优质、高效的TPU薄膜吹塑机组", 《中国塑料》, vol. 22, no. 11, 30 November 2008 (2008-11-30), pages 92 - 96 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111672837A (en) * | 2020-06-16 | 2020-09-18 | 三门核电有限公司 | Pipeline high-flow flushing method |
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Effective date of registration: 20170119 Address after: Haojiang District Textile Industrial Park, 515098 Guangdong city of Shantou Province Patentee after: Guangdong Jinming Machinery Co., Ltd. Patentee after: Guangdong gold Jiaxin Mstar Technology Ltd Address before: Haojiang District Textile Industrial Park, 515098 Guangdong city of Shantou Province Patentee before: Guangdong Jinming Machinery Co., Ltd. |