CN102431141B - 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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- CN102431141B CN102431141B CN2011103275271A CN201110327527A CN102431141B CN 102431141 B CN102431141 B CN 102431141B CN 2011103275271 A CN2011103275271 A CN 2011103275271A CN 201110327527 A CN201110327527 A CN 201110327527A CN 102431141 B CN102431141 B CN 102431141B
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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-extrusion film-blowing production technology, particularly a kind of clear method of extruder of Multi-layer co-extrusion film-blowing equipment and die head.
Background technology
In the production process of Multi-layer co-extrusion film-blowing, adopt many extruders to extrude different material melts, the material that each extruder is extruded gathers and jointly extrudes at die head, formation has the circular film bubble of multi-layer material, be enclosed with Compressed Gas in film bubble in order to form inflation, film bubble is through inflation, rolling after cooling.For Multi-layer co-extrusion film-blowing equipment, its production process has multiple different material formula, when a kind of formula is converted into another kind of formula, due to the fused materials viscosity, need a transfer process, be detained material to last consignment of in extruder and die head and thoroughly clear, fully replace and become new material, with the material that prevents last consignment of sneak into and affect the next group product and make the material of next group product or color influenced, above-mentioned cleaning transfer process is called again " clear ".
Traditional clear method is from each extruder, to extrude respectively and completing the production of last consignment of formula at the material of last consignment of formula, new material is added to 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 die head, and new material is replaced out by the last consignment of material.This clear mode of at the uniform velocity extruding can make film bubble hold in clear process relaying continuation of insurance that thickness is stable, the film bubble extruded velocity keeps coordination with cooling velocity, avoid clear process film bubble to break, also can make the film bubble produced in the clear process still can stably realize rolling.But, due to melt in extruder and die head flow process, produce friction and viscous between melt and flow path wall, make the flowing velocity of runner middle part large, and it is slow near the melt flow rate of flow path wall, the material newly affixed substantially equates with the material just washed away and forms dynamic equilibrium, sometimes even at flow path wall viscous one deck material, form false wall 1 (as shown in Figure 1, in Fig. 1, the speed at this position of the longer expression of arrow is faster), the existence of " false wall " phenomenon, make the flow path wall surface be difficult to thoroughly effectively be washed away, therefore clear speed is very slow, usually need about five hours, the raw material amount of expending is large.
Summary of the invention
The clear method that the object of the invention is to overcome above-mentioned shortcoming and a kind of extruder and die head of Multi-layer co-extrusion film-blowing equipment are provided, its clear process takes a short time, and expends raw material few.
For achieving the above object, the clear method of the extruder of Multi-layer co-extrusion film-blowing equipment of the present invention and die head comprises the following steps: at the material of last consignment of formula, from each extruder, extrude respectively and completing the production of last consignment of formula, new material is added respectively to corresponding extruder and starts clear, until new material clears the delay material of last consignment of formula fully from extruder and die head; It is characterized in that, in the clear process, the extruded velocity of each extruder adopts central controller controls; The extruded velocity that central controller makes each extruder is fluctuation conversion up and down constantly, 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, refer to 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 mode that the present invention adopts concussion to extrude to each extruder, therefore with traditional at the uniform velocity clear mode, compare, the clear time can significantly be shortened, save the required material of clear, this mainly contains two 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 lifting occurs 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, so more easily destroy false wall or be not easy to form and stablize false wall.(2), tradition is at the uniform velocity in the clear mode, the impulsive force of clear fluid remains unchanged; And the maximum extruded velocity of clear mode of the present invention is larger than the extruded velocity of traditional at the uniform velocity clear, maximum scouring force is larger than the scouring force of traditional at the uniform velocity clear, forms violent scour, and this also is conducive to the reduce clash required time.(give an example, suppose that the viscous force size that flow path wall certain is detained between material and flow path wall is a, if adopting the tradition scouring force size that at the uniform velocity the clear mode forms at this place is only 0.8a, the maximum scouring force that adopts clear mode of the present invention to form at this place just is greater than a.For example may reach the 1.2a left and right; In these cases, if adopt at the uniform velocity clear mode of tradition, need one section for a long time, could be by this delay material at leisure, layer by layer, progressively wash away from outside to inside, if but adopt clear mode of the present invention, in the moment of maximum scouring force, just may make under this delay material monoblock full wafer ground ablation, so clear mode of the present invention can shorten the clear required time).
2, on the present invention's each time point in the middle of the clear process, the summation of each extruder extruded velocity remains unchanged, and therefore when each extruder adopts speed change extrusion way, still can guarantee that film bubble do not break.And keep bubble thickness and the film bubble extruded velocity constant, make film bubble extruded velocity and cooling velocity keep coordinating, film bubble keeps stable in the clear process, keeps continuity, the stability of the whole production process film bubble in clear front and back.
The accompanying drawing explanation
Fig. 1 is traditional clear method velocity flow profile and produces false wall schematic diagram.
The specific embodiment
embodiment mono-
A kind of clear method of extruder of nine layers of coextrusion film blowing equipment and die head, this film blowing device has A, B, C, D, E, F, G, H, nine extruders of I, comprise the following steps: at the material of last consignment of formula, from nine extruders, extrude respectively and completing the production of last consignment of formula, new material is added respectively to each extruder and starts clear, until new material clears the delay material of last consignment of formula fully from extruder and die head; In the clear process, the extruded velocity of each extruder adopts central controller controls; Central controller makes the constantly fluctuation conversion up and down of 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, control the extruded velocity of respectively organizing extruder and remain unchanged.In each group, when wherein the extruded velocity of an extruder reaches maximum (normally 1.8 times of extruded velocity), the extruded velocity of the another two extruders of same group is 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 minimum extruded velocity value separately and maximum extruded velocity value.
embodiment bis-
A kind of clear method of extruder of seven-layer co-extrusion film blowing device and die head, this film blowing device has A, B, C, D, E, F, seven extruders of G, comprise the following steps: at the material of last consignment of formula, from seven extruders, extrude respectively and completing the production of last consignment of formula, new material is added respectively to each extruder and starts clear, until new material clears the delay material of last consignment of formula fully from extruder and die head; In the clear process, the extruded velocity of each extruder adopts central controller controls; Central controller makes the constantly fluctuation conversion up and down of 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, control the extruded velocity summation of respectively organizing extruder and remain unchanged.In first group, second group, when wherein the extruded velocity of an extruder reaches maximum (normally 1.5 times of extruded velocity), the extruded velocity of another extruder of same group is 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), the extruded velocity of the another two extruders of same group 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 minimum extruded velocity value separately and maximum extruded velocity value.
embodiment tri-
A kind of clear method of extruder of three-layer co-extruded film blowing device and die head, this film blowing device has A, B, tri-extruders of C, comprise the following steps: at the material of last consignment of formula, from three extruders, extrude respectively and completing the production of last consignment of formula, new material is added respectively to each extruder and starts clear, until new material clears the delay material of last consignment of formula fully from extruder and die head; In the clear process, the extruded velocity of each extruder adopts central controller controls; Central controller makes the constantly fluctuation conversion up and down of 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 reaches maximum (normally 1.4 times of extruded velocity), the extruded velocity of another two extruders reaches minimum of a value (normally 0.8 times of extruded velocity); 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 is respectively 1.7 hours, 1.9 hours, 2 hours, reduces the time of 2/3 left and right than traditional approach, saves the raw material of 2/3 left and right.
Claims (1)
1. the clear method of the extruder of a Multi-layer co-extrusion film-blowing equipment and die head, comprise the following steps: at the material of last consignment of formula, from each extruder, extrude respectively and completing the production of last consignment of formula, new material is added respectively to corresponding extruder and starts clear, until new material clears the delay material of last consignment of formula fully from extruder and die head; It is characterized in that: in the clear process, the extruded velocity of each extruder adopts central controller controls; The extruded velocity that central controller makes each extruder is fluctuation conversion up and down constantly, 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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| CN102431141B true CN102431141B (en) | 2013-12-11 |
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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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59131438A (en) * | 1983-01-17 | 1984-07-28 | Japan Steel Works Ltd:The | Color or material changing method in injection molding method |
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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 |
| 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 (3)
| Title |
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| JP昭59-131438A 1984.07.28 |
| 优质、高效的TPU薄膜吹塑机组;李浩;《中国塑料》;20081130;第22卷(第11期);92-96 * |
| 李浩.优质、高效的TPU薄膜吹塑机组.《中国塑料》.2008,第22卷(第11期),92-96. |
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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. |