CN103101169A - Process for producing building plastic formwork by co-extrusion method and compound mould - Google Patents

Process for producing building plastic formwork by co-extrusion method and compound mould Download PDF

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CN103101169A
CN103101169A CN2013100226376A CN201310022637A CN103101169A CN 103101169 A CN103101169 A CN 103101169A CN 2013100226376 A CN2013100226376 A CN 2013100226376A CN 201310022637 A CN201310022637 A CN 201310022637A CN 103101169 A CN103101169 A CN 103101169A
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plastic
shaping channel
composite
top layer
composite bed
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CN103101169B (en
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张琪彬
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Abstract

The invention discloses a process for producing a building plastic formwork by a co-extrusion method and a compound mould. At least two plastic extruder production lines are adopted; after an inner-layer foaming plastic extruder extrudes a prototype of an inner-layer plastic formwork, a surface-layer structure is extruded on the outer surface of the prototype of the plastic formwork by a surface-layer foaming plastic extruder; and then, a multilayered compound plastic building formwork product is formed through a vacuum sizing machine, a traction machine and a cutting machine in sequence. According to the process for producing the building plastic formwork by the co-extrusion method and the compound mould, waste plastic is used as a main raw material to form an inner layer and 20% of new materials are added to form an outer layer; and a brand-new plastic formwork is produced through a co-extrusion machining process; and the surface strength of products can be improved, the surface smooth finish is high, the strength is high and the compound mould is not easy to damage, the alkaline corrosion resistance is strong and the service life is greatly prolonged. According to the compound mould, surface-layer plastic can be uniformly collected to the center from a chute and pressure is generated; the pressure strength corresponds to an inner layer traveling speed; the utilization effect is good and the working efficiency is high; and the compound mould is very good for popularization and implementation.

Description

Coextruding method is produced building plastic formwork technique and composite die
Technical field
The present invention relates to template production technology in a kind of building field, be specifically related to a kind of coextruding method and produce building plastic formwork technique and composite die.
Background technology
At present; the plastic formwork that adopts in building field; cure process must be done in its surface; otherwise because template its surface meeting when concrete is combined be corroded because of concrete strong basicity; cause the template degradation even to scrap; the surperficial cure process mode of existing building template is fairly simple, is with the template direct water-cooling after outlet mold but or oil cooling, makes the template surface formation layer protective layer that hardens rapidly.Facts have proved, protective layer can improve template surface fineness, played to a certain extent anticorrosive and not with the effect of the easy demoulding of concrete bonding.Yet the protective layer intensity of existing template surface is not high, still can be corroded by alkaline matter.And existing template protection layer thickness is lower, is generally 20 thickness, and because concrete has alkalescence, under normal operating position, the protective layer of template surface can be corroded gradually, finally causes the coarse easily sticking ash of template surface, and template is shorter service life.
At present, there are a large amount of waste PVC plastic products in China, does not also have good method to be recycled, and so not only causes a large amount of wastes of these waste PVC plastic products resources, but also causes a large amount of white pollutions.China is conventional in building field construction, and what use is in the majority with plank sheathing, and the bamboo offset plate is arranged simultaneously, and steel form is also deposited.The shortcomings such as plank sheathing has easy suction, comes unglued, and is out of shape, and the number of turnover is few are badly in need of substituting traditional mould material with a kind of New Type Architecture Mode, could save like this timber resources of China's preciousness.
In building field, can improve intensity and the corrosion resistance of plastic formwork by composite shuttering, composite shuttering has the common advantage of unlike material.Existing composite shuttering is generally plastic steel composite structure, or moulds wooden composite construction, perhaps the plastic composite structure of two or more varying strength performances, yet, existing composite shuttering is adopted the fixing composite shuttering that forms in the method for paste mostly, and this complex method has intensity difference, defective easy to crack.Paste or the heat seal mode exist only in adhesive surface in conjunction with dynamics, sticking veneer can be aging gradually, causes composite shuttering shorter service life.
Summary of the invention
It is poor to the objective of the invention is for plastic building template ubiquity surface strength in prior art, and the problem that easily is corroded provides a kind of coextruding method to produce building plastic formwork technique and composite die.
the present invention is achieved through the following technical solutions: a kind of coextruding method is produced building plastic formwork technique, comprise and adopt the plastics kneader, the extrusion process that feeder and extruder form, adopt simultaneously at least two sleeving plastic kneaders, be respectively top layer kneader and inner sandwich layer kneader, each plastics kneader is respectively by being combined to form at least two plastic extrusion machine production lines with top layer plastic extruder and internal layer foamed plastic extruder after feeder, internal layer foamed plastic extruder is extruded surface structure by the top layer plastic extruder at this plastic formwork blank outer surface after extruding inner plastic template blank, then pass through successively vacuum setting machine, hauling machine and cutting machine, form multilayer composite plastic building template product.
the co-extrusion process of multilayer composite plastic building template adopts composite die to realize, described composite die comprises inner sandwich layer shaping channel and composite bed shaping channel from front to back successively, be provided with side inlet on the side between inner sandwich layer shaping channel and composite bed shaping channel, internal layer foamed plastic extruder is connected with the entrance of inner sandwich layer shaping channel, the top layer plastic extruder is connected with the side inlet of composite die, heater is set on composite die, keeping temperature range is 155~170 ℃, the width of inner sandwich layer shaping channel is less than the width of composite bed shaping channel, preferred version is that inner sandwich layer shaping channel maintenance temperature range is 160 ℃, it is 165 ℃ that the composite bed shaping channel keeps temperature range, be provided with the top layer plastics at the front end face of composite bed shaping channel and hoard the chamber, the outward flange that these top layer plastics are hoarded the chamber is provided with chute, chute upper, the lower end is respectively arranged with and the top layer plastics can be flowed into the discharging opening of chute, simultaneously be provided with guiding gutter on the middle part of composite bed shaping channel or trailing flank, guiding gutter is connected with the outlet of top layer plastic extruder by passage or pipeline, the upper and lower end of guiding gutter is respectively arranged with charging aperture, upper and lower charging aperture respectively with the corresponding connection of described upper and lower discharging opening, make to hoard in the chamber to keep pressure.Adopt two plastic extrusion machine production lines, two plastic extrusion machine production lines form the ectonexine composite plastic building shuttering by composite die simultaneously.Be provided with the tapering transition face between chute and composite bed shaping channel.Be provided with the planar annular district around the composite bed shaping channel between the excessive face of taper and composite bed shaping channel, each plane in planar annular district is vertical with composite bed shaping channel inner surface.
A kind of composite die, comprise shell, the front end of shell is provided with the die hole import, the front end of shell is provided with the rear end and is provided with the die hole outlet, be provided with the top layer plastic feed from the die hole import to the middle housing side mould outlet, described die hole import is communicated with internal layer foamed plastic outlet of extruder, and described top layer plastic feed is communicated with the top layer plastic extruder, is provided with electric heater unit in shell upper or sidewall simultaneously; In the shell inner cavity corresponding with the top layer plastic inlet, co-extruding mould is installed, the middle part of this co-extruding mould is provided with the composite bed shaping channel, the width of the shaping channel at die inlet place is less than the width of composite bed shaping channel, be provided with the top layer plastics at the front end face of co-extruding mould and hoard the chamber, the outward flange that these top layer plastics are hoarded the chamber is provided with chute, and the upper and lower end of chute is respectively arranged with and the top layer plastics can be flowed into the discharging opening of chute; Simultaneously be provided with guiding gutter on the middle part of co-extruding mould or trailing flank, guiding gutter is connected with the outlet of top layer plastic extruder by passage or pipeline, the upper and lower end of guiding gutter is respectively arranged with charging aperture, upper and lower charging aperture respectively with the corresponding connection of described upper and lower discharging opening, make to hoard in the chamber to keep pressure.Be provided with the tapering transition face between flow-guiding channel and composite bed shaping channel.Be provided with the planar annular district around the composite bed shaping channel between the excessive face of taper and composite bed shaping channel, each plane in planar annular district is vertical with composite bed shaping channel inner surface.
the present invention has the following advantages: the invention provides the technique that adopts the co-extrusion mode to realize composite shuttering, take waste or used plastics as primary raw material as internal layer, add 20% virgin material as skin, by the co-extrusion processing technology, produce a kind of brand-new plastic formwork, cardinal principle is: attach the auxiliary agents such as blowing agent with waste or used plastics and pass through extruder, extrude inner sandwich layer (density is about 0.6), jointly extrude in a mould with 20% hard PVC simultaneously the PVC foaming product is carried out entire package, operation by certain technique can combine them completely, produce a kind of brand-new coextruding method plastic formwork.
By technique of the present invention, can guarantee internal layer when blank with outer by pressure and mould shape, both are pressed together, internal layer is in the hot melt state directly and the extrusion modling of outer hot melt state, two-layerly mutually combine and permeate the formation fixed structure, shaped article has thicker skin, usually greater than 50, not only improve surface strength, also improved the intensity of whole template.Composite shuttering after moulding no longer directly forms surperficial [Dan through the water cooling skinning in mouth mould end but does heat treatment by vacuum setting machine, and globality is better.By the composite shuttering that the method and mould form, surface smoothness is high, and intensity is high to be difficult for impairedly, and alkali resistant corrosivity is strong, and greatly extend service life.
Adopted co-extruding mould in composite die of the present invention, feeding-passage has been adopted in the front and back end of co-extruding mould (or middle part), be provided with on the end face of co-extrusion and hoard the chamber, its edge arranges chute and helps the tapering transition face of top layer plastics slip and the planar annular district that keeps extruding allowance.By long-term on probation and many experiments, determined the structure of reasonable co-extrusion, the top layer plastics converge and produce pressure equably from the chute to the center, and its intensity of pressure is suitable with the internal layer gait of march, and result of use is good, and high efficiency is beneficial to promotion and implementation very much.
The product of producing by the present invention is pure plastic products, and surface strength and density are high, do not absorb water.Inner sandwich layer forms the skeleton support force take waste or used plastics as masterbatch, and intensity is high.Overcome common foam template fragility large, the surface skining layer is thin, and the number of turnover that the poor shortcoming (the co-extrusion epidermal area reaches 0.7MM) of corrosivity resistance of mixing clay has been improved greatly template can reach more than 30 times.Product has good toughness, rigidity, and anti-impact force is strong, and is not fragile.
Description of drawings
Fig. 1 is process chart;
Fig. 2 is internal layer and outside coextrusion mold view;
Fig. 3 is (D section) end view after moulding;
Fig. 4 is composite die and top layer plastic extruder and internal layer foamed plastic extruder annexation figure;
Fig. 5 is the A-A cross-sectional view of Fig. 4;
Fig. 6 is the B-B cross-sectional view of Fig. 4;
Fig. 7 is the C-C cross-sectional view of Fig. 4.
In figure, label 1 is the inner plastic template, and 2 is outside plastic formwork, and 3 is the limit rib, 4 is middle rib, and 5 is internal layer foamed plastic extruder, and 6 is the top layer plastic extruder, and 7 is composite die, 8 is co-extruding mould, and 9 is the inner sandwich layer shaping channel, and 10 is the composite bed shaping channel, 11 is the upper end discharging opening, and 12 is the lower end discharging opening, and 13 is chute, 14 is the tapering transition face, and 15 is the planar annular district, and 16 is the upper end charging aperture, 17 is the lower end charging aperture, and 18 is gathering sill, and 19 is fixing hole.
The specific embodiment
Embodiment 1: referring to Fig. 1, Fig. 2 and Fig. 3, coextruding method is produced building plastic formwork technique and is adopted simultaneously two sleeving plastic kneaders, be respectively top layer kneader and inner sandwich layer kneader, each plastics kneader is respectively by being combined to form two plastic extrusion machine production lines with top layer plastic extruder and internal layer foamed plastic extruder after feeder, article two, the plastic extrusion machine production line forms composite plastic building shuttering by composite die simultaneously, then pass through successively vacuum setting machine, hauling machine and cutting machine, form multilayer composite plastic building template product.Wherein, top layer plastic extruder 6 is connected with internal layer foamed plastic extruder and is connected with composite die by orthogonal mode, referring to Fig. 4.
Can find out from Fig. 5, Fig. 6 and Fig. 7, composite die 7 comprises inner sandwich layer shaping channel 9 and composite bed shaping channel 10 from front to back successively, on composite die 7, heater is set.the width of inner sandwich layer shaping channel 9 is less than the width of composite bed shaping channel 10, it is 160 ℃ that the inner sandwich layer shaping channel keeps temperature range, it is 165 ℃ that the composite bed shaping channel keeps temperature range, be combined with inner layer material better in order to make the top layer plastics, be provided with the top layer plastics at the front end face of composite bed shaping channel 10 and hoard the chamber, the outward flange that these top layer plastics are hoarded the chamber is provided with chute 13, chute 13 upper, the lower end is respectively arranged with and the top layer plastics can be flowed into the discharging opening 11 and 12 of chute, chute 13 is structures of annular, can inwardly push from surrounding, make extruding evenly.The plastic formwork structure of moulding is different as required, the described formwork structure with limit rib 3 and middle rib 4 of Fig. 3 for example, the central region of limit rib 3 and middle rib 4, and discontinuity or dead angle area can appear in the larger plane domain in plastic formwork upper surface, take to be provided with the method for tapering transition face (outstanding forward) between chute and composite bed shaping channel, in order to improve the intensity of pressure of position, local dead angle, guarantee that the whole skin power that is squeezed is even.The mode that the top layer plastics are introduced chute is to be provided with guiding gutter 18 on the middle part of composite bed shaping channel 10 or trailing flank, guiding gutter 18 is connected with 6 outlets of top layer plastic extruder by passage or pipeline, the upper and lower end of guiding gutter 18 is respectively arranged with charging aperture 16 and 17, upper and lower charging 16 and 17 mouthfuls respectively with described upper and lower discharging opening 11 and 12 corresponding connections, make to hoard to keep pressure in the chamber.
The problem of top layer plastics maldistribution when preventing extrusion modling, be provided with the planar annular district 15 around the composite bed shaping channel between the excessive face 14 of taper and composite bed shaping channel 10, each plane in planar annular district 15 is vertical with composite bed shaping channel inner surface, planar annular district 15 is conducive to hoard enough top layer plastics at the composite bed channel entrance, in case leak-stopping hole generation.
embodiment 2: content is substantially the same manner as Example 1, different is, adopted and contained an internal layer foamed plastic extruder and two top layer plastic extruders, each extruder is connected with composite die respectively, two top layer plastic extruders are installed sequencing and are arranged, adopt the two cover co-extrusion modes identical with embodiment 1, be to have adopted the described co-extrusion mode of embodiment 1 and structure between first top layer plastic extruder and internal layer, form the ground floor composite shuttering, second top layer plastic extruder adopts co-extrusion mode and structure as described in Example 1 with the composite shuttering for the first time that has formed, formation has the composite shuttering of inside and outside three-decker.
Embodiment 3: referring to Fig. 3~Fig. 7, composite die comprises shell, the front end of shell is provided with the die hole import, the front end of shell is provided with the rear end and is provided with the die hole outlet, be provided with the top layer plastic feed from the die hole import to the middle housing side mould outlet, described die hole import is communicated with internal layer foamed plastic outlet of extruder, and described top layer plastic feed is communicated with the top layer plastic extruder, is provided with electric heater unit in shell upper or sidewall simultaneously; In the shell inner cavity corresponding with the top layer plastic inlet, co-extruding mould is installed, the middle part of this co-extruding mould is provided with the composite bed shaping channel, the width of the shaping channel at die inlet place is less than the width of composite bed shaping channel, be provided with the top layer plastics at the front end face of co-extruding mould and hoard the chamber, the outward flange that these top layer plastics are hoarded the chamber is provided with chute, and the upper and lower end of chute is respectively arranged with and the top layer plastics can be flowed into the discharging opening of chute; Simultaneously be provided with guiding gutter on the middle part of co-extruding mould or trailing flank, guiding gutter is connected with the outlet of top layer plastic extruder by passage or pipeline, the upper and lower end of guiding gutter is respectively arranged with charging aperture, upper and lower charging aperture respectively with the corresponding connection of described upper and lower discharging opening, make to hoard in the chamber to keep pressure.Be provided with the tapering transition face between flow-guiding channel and composite bed shaping channel.Be provided with the planar annular district around the composite bed shaping channel between the excessive face of taper and composite bed shaping channel, each plane in planar annular district is vertical with composite bed shaping channel inner surface.

Claims (10)

1. a coextruding method is produced building plastic formwork technique, comprise and adopt the plastics kneader, the extrusion process that feeder and extruder form, it is characterized in that: adopt simultaneously at least two sleeving plastic kneaders, be respectively top layer kneader and inner sandwich layer kneader, each plastics kneader is respectively by being combined to form at least two plastic extrusion machine production lines with top layer plastic extruder and internal layer foamed plastic extruder after feeder, internal layer foamed plastic extruder is extruded surface structure by the top layer plastic extruder at this plastic formwork blank outer surface after extruding inner plastic template blank, then pass through successively vacuum setting machine, hauling machine and cutting machine, form multilayer composite plastic building template product.
2. coextruding method according to claim 1 is produced building plastic formwork technique, it is characterized in that: the co-extrusion process of multilayer composite plastic building template adopts composite die to realize, described composite die comprises inner sandwich layer shaping channel and composite bed shaping channel from front to back successively, be provided with side inlet on the side between inner sandwich layer shaping channel and composite bed shaping channel, internal layer foamed plastic extruder is connected with the entrance of inner sandwich layer shaping channel, the top layer plastic extruder is connected with the side inlet of composite die, heater is set on composite die, keeping temperature range is 155~170 ℃, the width of inner sandwich layer shaping channel is less than the width of composite bed shaping channel, be provided with the top layer plastics at the front end face of composite bed shaping channel and hoard the chamber, the outward flange that these top layer plastics are hoarded the chamber is provided with chute, chute upper, the lower end is respectively arranged with and the top layer plastics can be flowed into the discharging opening of chute, simultaneously be provided with guiding gutter on the middle part of composite bed shaping channel or trailing flank, guiding gutter is connected with the outlet of top layer plastic extruder by passage or pipeline, the upper and lower end of guiding gutter is respectively arranged with charging aperture, upper and lower charging aperture respectively with the corresponding connection of described upper and lower discharging opening, make to hoard in the chamber to keep pressure.
3. coextruding method according to claim 2 is produced building plastic formwork technique, it is characterized in that: it is 160 ℃ that the inner sandwich layer shaping channel keeps temperature range, and it is 165 ℃ that the composite bed shaping channel keeps temperature range.
4. according to claim 1-3 described coextruding methods of any one are produced building plastic formwork technique, and it is characterized in that: only adopt two plastic extrusion machine production lines, two plastic extrusion machine production lines form the ectonexine composite plastic building shuttering by composite die simultaneously.
5. coextruding method according to claim 1 is produced building plastic formwork technique, it is characterized in that: be provided with the tapering transition face between chute and composite bed shaping channel.
6. coextruding method according to claim 1 is produced building plastic formwork technique, it is characterized in that: be provided with the planar annular district around the composite bed shaping channel between the excessive face of taper and composite bed shaping channel, each plane in planar annular district is vertical with composite bed shaping channel inner surface.
7. composite die that is applicable to the described coextrusion process of claim 1, comprise shell, the front end of shell is provided with the die hole import, the front end of shell is provided with the rear end and is provided with the die hole outlet, it is characterized in that: be provided with the top layer plastic feed from the die hole import to the middle housing side mould outlet, described die hole import is communicated with internal layer foamed plastic outlet of extruder, described top layer plastic feed is communicated with the top layer plastic extruder, is provided with electric heater unit in shell upper or sidewall simultaneously; In the shell inner cavity corresponding with the top layer plastic inlet, co-extruding mould is installed, the middle part of this co-extruding mould is provided with the composite bed shaping channel, the width of the shaping channel at die inlet place is less than the width of composite bed shaping channel, be provided with the top layer plastics at the front end face of co-extruding mould and hoard the chamber, the outward flange that these top layer plastics are hoarded the chamber is provided with chute, and the upper and lower end of chute is respectively arranged with and the top layer plastics can be flowed into the discharging opening of chute.
8. composite die according to claim 7, it is characterized in that: be provided with guiding gutter on the middle part of co-extruding mould or trailing flank, guiding gutter is connected with the outlet of top layer plastic extruder by passage or pipeline, the upper and lower end of guiding gutter is respectively arranged with charging aperture, upper and lower charging aperture respectively with the corresponding connection of described upper and lower discharging opening, make to hoard in the chamber to keep pressure.
9. composite die according to claim 7, is characterized in that: be provided with the tapering transition face between flow-guiding channel and composite bed shaping channel.
10. composite die according to claim 7 is characterized in that: be provided with the planar annular district around the composite bed shaping channel between the excessive face of taper and composite bed shaping channel, each plane in planar annular district is vertical with composite bed shaping channel inner surface.
CN201310022637.6A 2013-01-22 2013-01-22 Coextruding method produces building plastic formwork technique and composite die Expired - Fee Related CN103101169B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2519249A (en) * 2014-01-07 2015-04-15 Environmental Technology Evolution Ltd Process and apparatus for manufacturing a multilayer article
CN105965816A (en) * 2016-05-27 2016-09-28 河北莫特美橡塑科技有限公司 Production line of three-layer hollow plastic formwork
CN106003644A (en) * 2016-05-23 2016-10-12 中山市百事顺业塑料电器有限公司 Production method of colored crystal frame bar
CN107244083A (en) * 2017-05-08 2017-10-13 姚献忠 The production technology and equipments of ribbed plate
CN111844677A (en) * 2020-06-24 2020-10-30 四川大学 Multilayer foamed recycled plastic and preparation method thereof

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Publication number Priority date Publication date Assignee Title
GB2519249A (en) * 2014-01-07 2015-04-15 Environmental Technology Evolution Ltd Process and apparatus for manufacturing a multilayer article
CN106003644A (en) * 2016-05-23 2016-10-12 中山市百事顺业塑料电器有限公司 Production method of colored crystal frame bar
CN105965816A (en) * 2016-05-27 2016-09-28 河北莫特美橡塑科技有限公司 Production line of three-layer hollow plastic formwork
CN107244083A (en) * 2017-05-08 2017-10-13 姚献忠 The production technology and equipments of ribbed plate
CN107244083B (en) * 2017-05-08 2023-07-28 姚献忠 Production process and equipment for ribbed plate
CN111844677A (en) * 2020-06-24 2020-10-30 四川大学 Multilayer foamed recycled plastic and preparation method thereof

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