CN103101169B - Coextruding method produces building plastic formwork technique and composite die - Google Patents
Coextruding method produces building plastic formwork technique and composite die Download PDFInfo
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- CN103101169B CN103101169B CN201310022637.6A CN201310022637A CN103101169B CN 103101169 B CN103101169 B CN 103101169B CN 201310022637 A CN201310022637 A CN 201310022637A CN 103101169 B CN103101169 B CN 103101169B
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Abstract
The invention discloses a kind of coextruding method and produce building plastic formwork technique and composite die, adopt at least two plastic extrusion machine production lines, surface structure is extruded by top layer plastic extruder at this plastic formwork blank outer surface after inner plastic template blank extruded by internal layer foamed plastic extruder, then successively through vacuum setting machine, hauling machine and cutting machine, multilayer composite plastic building template product is formed.Waste or used plastics can be that primary raw material is as internal layer by the present invention, add the virgin material of 20% as skin, by co-extrusion processing technology, produce a kind of brand-new plastic formwork, the present invention can improve product surface intensity, and surface smoothness is high, and intensity height is not easily damaged, alkali-resistant property is strong, and service life extends greatly.Composite die can make top layer plastics from chute to center convergence, produce pressure equably, and its intensity of pressure is suitable with internal layer gait of march, and result of use is good, and operating efficiency is high, be very beneficial to promotion and implementation.
Description
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 adopted in building field; cure process must be done in its surface; otherwise because of template and concrete in conjunction with time its surface can corrode because of concrete strong basicity; template degradation is caused even to scrap; the Surface hardening treatment Method compare of existing building template is simple, be by outlet mold after template direct water-cooling but or oil cooling, make the rapid curing formation layer protective layer of template surface.Facts have proved, protective layer can improve template surface fineness, serves effect that is anticorrosive and the not easy demoulding with concrete bonding to a certain extent.But 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, be generally 20 thickness, because concrete has alkalescence, under normal usage, the protective layer of template surface can be corroded gradually, and finally cause the coarse easily sticky ash of template surface, template is shorter for 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's routine in building field construction uses with plank sheathing in the majority, and have bamboo slab rubber, steel form is also deposited simultaneously.The shortcomings such as plank sheathing has easy water suction, comes unglued, distortion, and the number of turnover is few, are badly in need of carrying out alternative traditional mould material by a kind of New Type Architecture Mode, could save the timber resources of China's preciousness like this.
In building field, can be improved intensity and the corrosion resistance of plastic formwork by composite shuttering, composite shuttering has the Common advantages of unlike material.Existing composite shuttering is generally plastic steel composite structure, or moulds wooden composite construction, or the plastic composite structure of two or more varying strength performance, but, existing composite shuttering adopts fixing formation composite shuttering in the method for paste mostly, and this complex method has intensity difference, defect easy to crack.Paste or heat seal mode exist only in adhesive surface in conjunction with dynamics, sticking veneer can be aging gradually, causes composite shuttering shorter for service life.
Summary of the invention
It is poor to the object of the invention is for plastic building template ubiquity surface strength in prior art, the problem be easily corroded, and 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 produces building plastic formwork technique, comprise and adopt plastics kneader, the extrusion process that feeder and extruder are formed, adopt at least two sleeving plastic kneaders simultaneously, be respectively top layer kneader and inner sandwich layer kneader, each plastics kneader is combined to form at least two plastic extrusion machine production lines respectively by after feeder with top layer plastic extruder and internal layer foamed plastic extruder, surface structure is extruded by top layer plastic extruder at this plastic formwork blank outer surface after inner plastic template blank extruded by internal layer foamed plastic extruder, then successively through 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, side between inner sandwich layer shaping channel and composite bed shaping channel is provided with side inlet, internal layer foamed plastic extruder is connected with the entrance of inner sandwich layer shaping channel, top layer plastic extruder is connected with the side inlet of composite die, composite die arranges heater, temperature range is kept to be 155 ~ 170 DEG C, 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 keeps temperature range to be 160 DEG C, composite bed shaping channel keeps temperature range to be 165 DEG C, the front end face of composite bed shaping channel is provided with top layer plastics and hoards chamber, the outward flange that chamber hoarded by these top layer plastics is provided with chute, chute upper, lower end is respectively arranged with the discharging opening that top layer plastics can be flowed into chute, on the middle part or trailing flank of composite bed shaping channel, be provided with guiding gutter simultaneously, guiding gutter is exported with top layer plastic extruder by passage or pipeline and is connected, the upper and lower end of guiding gutter is respectively arranged with charging aperture, upper and lower charging aperture is corresponding with described upper and lower discharging opening to be respectively communicated with, and makes to hoard in chamber to keep pressure.Adopt two plastic extrusion machine production lines, two plastic extrusion machine production lines form ectonexine composite plastic building shuttering by composite die simultaneously.Tapering transition face is provided with between chute and composite bed shaping channel.Between tapering transition face and composite bed shaping channel, be provided with the planar annular district around 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 die hole import, the rear end of shell is provided with die hole outlet, middle housing side from die hole import to mould outlet is provided with top layer plastic feed, described die hole import is communicated with internal layer foamed plastic outlet of extruder, and described top layer plastic feed is communicated with top layer plastic extruder, shell upper or sidewall is provided with electric heater unit simultaneously; In the shell inner cavity corresponding with top layer plastic inlet, co-extruding mould is installed, the middle part of this co-extruding mould is provided with composite bed shaping channel, the width of the shaping channel at die inlet place is less than the width of composite bed shaping channel, the front end face of co-extruding mould is provided with top layer plastics and hoards chamber, the outward flange that chamber hoarded by these top layer plastics is provided with chute, and the upper and lower end of chute is respectively arranged with the discharging opening that top layer plastics can be flowed into chute; On the middle part or trailing flank of co-extruding mould, be provided with guiding gutter simultaneously, guiding gutter is exported with top layer plastic extruder by passage or pipeline and is connected, the upper and lower end of guiding gutter is respectively arranged with charging aperture, upper and lower charging aperture is corresponding with described upper and lower discharging opening to be respectively communicated with, and makes to hoard in chamber to keep pressure.Tapering transition face is provided with between flow-guiding channel and composite bed shaping channel.Between tapering transition face and composite bed shaping channel, be provided with the planar annular district around 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 adopting co-extrusion mode to realize composite shuttering, be that primary raw material is as internal layer with waste or used plastics, add the virgin material of 20% as skin, by 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 the hard PVC of 20% entire package is carried out to PVC foam goods simultaneously, them are made to combine completely by the operation of certain technique, 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, make both press together, it is directly extruded with outer hot melt state that internal layer is in hot melt state, two-layerly be combined with each other and permeate formation fixed structure, shaped article has thicker skin, is usually greater than 50, not only increase surface strength, also improve the intensity of whole template.Composite shuttering after shaping no longer directly forms surperficial sclerocortex through 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 are formed, surface smoothness is high, and intensity height is not easily damaged, and alkali-resistant property is strong, and service life extends greatly.
Co-extruding mould is have employed in composite die of the present invention, the front and back end (or middle part) of co-extruding mould have employed feeding-passage, the end face of co-extrusion is provided with and hoards chamber, its edge arranges chute and contributes to the tapering transition face of top layer plastic slide and keep the planar annular district of extruding allowance.By on probation and many experiments for a long time, determine the structure of reasonable co-extrusion, top layer plastics produce pressure equably from chute to center convergence, and quite, result of use is good, and operating efficiency is high, is very beneficial to promotion and implementation for its intensity of pressure and internal layer gait of march.
The product produced by the present invention is pure plastic products, surface strength and density high, do not absorb water.Inner sandwich layer take waste or used plastics as masterbatch, and form skeletal support power, intensity is high.Overcome common foam template fragility large, surface skining layer is thin, and the number of turnover shortcoming (co-extrusion epidermal area reaches 0.7MM) of the corrosivity resistance difference of mixed clay being substantially increased to template can reach more than 30 times.Product has good toughness, rigidity, and anti-impact force is strong, not fragile.
Accompanying drawing explanation
Fig. 1 is process chart;
Fig. 2 is internal layer and outside coextrusion mold view;
Fig. 3 be shaping after (D portion) end view;
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 inner plastic template, and 2 is outside plastic formwork, and 3 is limit rib, 4 is middle rib, and 5 is internal layer foamed plastic extruder, and 6 is top layer plastic extruder, and 7 is composite die, 8 is co-extruding mould, and 9 is inner sandwich layer shaping channel, and 10 is composite bed shaping channel, 11 is upper end discharging opening, and 12 is lower end discharging opening, and 13 is chute, 14 is tapering transition face, and 15 is planar annular district, and 16 is upper end charging aperture, 17 is lower end charging aperture, and 18 is guiding gutter, and 19 is fixing hole.
Detailed description of the invention
Embodiment 1: see Fig. 1, Fig. 2 and Fig. 3, coextruding method is produced building plastic formwork technique and is adopted two sleeving plastic kneaders simultaneously, be respectively top layer kneader and inner sandwich layer kneader, each plastics kneader is combined to form two plastic extrusion machine production lines respectively by after feeder with top layer plastic extruder and internal layer foamed plastic extruder, article two, plastic extrusion machine production line forms composite plastic building shuttering by composite die simultaneously, then successively through vacuum setting machine, hauling machine and cutting machine, multilayer composite plastic building template product is formed.Wherein, top layer plastic extruder 6 is connected with composite die, see Fig. 4 by orthogonal mode with internal layer foamed plastic extruder 5.
As can be seen 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, and composite die 7 arranges heater.The width of inner sandwich layer shaping channel 9 is less than the width of composite bed shaping channel 10, inner sandwich layer shaping channel keeps temperature range to be 160 DEG C, composite bed shaping channel keeps temperature range to be 165 DEG C, be combined with inner layer material better to make top layer plastics, the front end face of composite bed shaping channel 10 is provided with top layer plastics and hoards chamber, the outward flange that chamber hoarded by these top layer plastics is provided with chute 13, chute 13 upper, lower end is respectively arranged with the discharging opening 11 and 12 that top layer plastics can be flowed into chute, chute 13 is structures of annular, inwardly can extrude from surrounding, make extruding even.Plastic formwork structure shaping is as required different, the formwork structure with limit rib 3 and middle rib 4 such as described in Fig. 3, the central region of limit rib 3 and middle rib 4, and the larger plane domain in plastic formwork upper surface there will be discontinuity or dead angle area, take the method being provided with tapering transition face (giving prominence to forward) between chute and composite bed shaping channel, to improve the intensity of pressure of position, dead angle, local, guarantee that the whole skin power that is squeezed is even.It is be provided with guiding gutter 18 on the middle part or trailing flank of composite bed shaping channel 10 that top layer plastics are introduced the mode of chute, guiding gutter 18 is exported with top layer plastic extruder 6 by passage or pipeline and is connected, the upper and lower end of guiding gutter 18 is respectively arranged with charging aperture 16 and 17, upper and lower charging 16 is communicated with described upper and lower discharging opening 11 is corresponding with 12 respectively with 17 mouthfuls, makes to hoard in chamber to keep pressure.
The problem of top layer plastics maldistribution during for preventing extruded, the planar annular district 15 around composite bed shaping channel is provided with between tapering transition face 14 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 hoarding enough top layer plastics at composite bed channel entrance, in case leak-stopping hole produces.
Embodiment 2: content is substantially the same manner as Example 1, unlike, have employed containing an internal layer foamed plastic extruder and two top layer plastic extruders, each extruder is connected with composite die respectively, sequencing arrangement installed by two top layer plastic extruders, adopt the co-extrusion mode that two covers are identical with embodiment 1, namely have employed the co-extrusion mode described in embodiment 1 and structure between first top layer plastic extruder and internal layer, form ground floor composite shuttering, second top layer plastic extruder adopts co-extrusion mode as described in Example 1 and structure with the first time composite shuttering formed, form the composite shuttering with inside and outside three-decker.
Embodiment 3: see Fig. 3 ~ Fig. 7, composite die comprises shell, the front end of shell is provided with die hole import, the front end of shell is provided with rear end and is provided with die hole outlet, middle housing side from die hole import to mould outlet is provided with top layer plastic feed, described die hole import is communicated with internal layer foamed plastic outlet of extruder, and described top layer plastic feed is communicated with top layer plastic extruder, shell upper or sidewall is provided with electric heater unit simultaneously; In the shell inner cavity corresponding with top layer plastic inlet, co-extruding mould is installed, the middle part of this co-extruding mould is provided with composite bed shaping channel, the width of the shaping channel at die inlet place is less than the width of composite bed shaping channel, the front end face of co-extruding mould is provided with top layer plastics and hoards chamber, the outward flange that chamber hoarded by these top layer plastics is provided with chute, and the upper and lower end of chute is respectively arranged with the discharging opening that top layer plastics can be flowed into chute; On the middle part or trailing flank of co-extruding mould, be provided with guiding gutter simultaneously, guiding gutter is exported with top layer plastic extruder by passage or pipeline and is connected, the upper and lower end of guiding gutter is respectively arranged with charging aperture, upper and lower charging aperture is corresponding with described upper and lower discharging opening to be respectively communicated with, and makes to hoard in chamber to keep pressure.Tapering transition face is provided with between flow-guiding channel and composite bed shaping channel.Between tapering transition face and composite bed shaping channel, be provided with the planar annular district around composite bed shaping channel, each plane in planar annular district is vertical with composite bed shaping channel inner surface.
Claims (9)
1. a coextruding method produces building plastic formwork technique, comprise and adopt plastics kneader, the extrusion process that feeder and extruder are formed, it is characterized in that: adopt at least two sleeving plastic kneaders simultaneously, be respectively top layer kneader and inner sandwich layer kneader, each plastics kneader is combined to form at least two plastic extrusion machine production lines respectively by after feeder with top layer plastic extruder and internal layer foamed plastic extruder, surface structure is extruded by top layer plastic extruder at this plastic formwork blank outer surface after inner plastic template blank extruded by internal layer foamed plastic extruder, then successively through vacuum setting machine, hauling machine and cutting machine, form multilayer composite plastic building template product, the co-extrusion process of its 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, side between inner sandwich layer shaping channel and composite bed shaping channel is provided with side inlet, internal layer foamed plastic extruder is connected with the entrance of inner sandwich layer shaping channel, top layer plastic extruder is connected with the side inlet of composite die, composite die arranges heater, temperature range is kept to be 155 ~ 170 DEG C, the width of inner sandwich layer shaping channel is less than the width of composite bed shaping channel, the front end face of composite bed shaping channel is provided with top layer plastics and hoards chamber, the outward flange that chamber hoarded by these top layer plastics is provided with chute, chute upper, lower end is respectively arranged with the discharging opening that top layer plastics can be flowed into chute, on the middle part or trailing flank of composite bed shaping channel, be provided with guiding gutter simultaneously, guiding gutter is exported with top layer plastic extruder by passage or pipeline and is connected, the upper and lower end of guiding gutter is respectively arranged with charging aperture, upper and lower charging aperture is corresponding with described upper and lower discharging opening to be respectively communicated with, and makes to hoard in chamber to keep pressure.
2. coextruding method according to claim 1 produces building plastic formwork technique, it is characterized in that: inner sandwich layer shaping channel keeps temperature range to be 160 DEG C, and composite bed shaping channel keeps temperature range to be 165 DEG C.
3. the coextruding method according to any one of claim 1-2 produces building plastic formwork technique, it is characterized in that: only adopt two plastic extrusion machine production lines, and two plastic extrusion machine production lines form ectonexine composite plastic building shuttering by composite die simultaneously.
4. coextruding method according to claim 1 produces building plastic formwork technique, it is characterized in that: be provided with tapering transition face between chute and composite bed shaping channel.
5. coextruding method according to claim 4 produces building plastic formwork technique, it is characterized in that: between tapering transition face and composite bed shaping channel, be provided with the planar annular district around composite bed shaping channel, each plane in planar annular district is vertical with composite bed shaping channel inner surface.
6. one kind is applicable to the composite die that coextruding method described in claim 1 produces building plastic formwork technique, comprise shell, the front end of shell is provided with die hole import, the rear end of shell is provided with die hole outlet, it is characterized in that: the middle housing side from die hole import to mould outlet is provided with top layer plastic feed, described die hole import is communicated with internal layer foamed plastic outlet of extruder, described top layer plastic feed is communicated with top layer plastic extruder, shell upper or sidewall is provided with electric heater unit simultaneously; In the shell inner cavity corresponding with top layer plastic inlet, co-extruding mould is installed, the middle part of this co-extruding mould is provided with composite bed shaping channel, the width of the shaping channel at die inlet place is less than the width of composite bed shaping channel, the front end face of co-extruding mould is provided with top layer plastics and hoards chamber, the outward flange that chamber hoarded by these top layer plastics is provided with chute, and the upper and lower end of chute is respectively arranged with the discharging opening that top layer plastics can be flowed into chute.
7. composite die according to claim 6, it is characterized in that: on the middle part or trailing flank of co-extruding mould, be provided with guiding gutter, guiding gutter is exported with top layer plastic extruder by passage or pipeline and is connected, the upper and lower end of guiding gutter is respectively arranged with charging aperture, upper and lower charging aperture is corresponding with described upper and lower discharging opening to be respectively communicated with, and makes to hoard in chamber to keep pressure.
8. composite die according to claim 7, is characterized in that: be provided with tapering transition face between flow-guiding channel and composite bed shaping channel.
9. composite die according to claim 8, is characterized in that: between tapering transition face and composite bed shaping channel, be provided with the planar annular district around composite bed shaping channel, and each plane in planar annular district is vertical with composite bed shaping channel inner surface.
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| CN201310022637.6A CN103101169B (en) | 2013-01-22 | 2013-01-22 | Coextruding method produces building plastic formwork technique and composite die |
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| CN201310022637.6A CN103101169B (en) | 2013-01-22 | 2013-01-22 | Coextruding method produces building plastic formwork technique and composite die |
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| CN103101169B true CN103101169B (en) | 2016-02-24 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB201400232D0 (en) * | 2014-01-07 | 2014-02-26 | Environmental Technology Evolution Ltd | Ete 1 |
| 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 |
| 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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Granted publication date: 20160224 Termination date: 20190122 |