CN202858653U - Paper pulp molding container cover with dotted protrusions and hot-pressing die thereof - Google Patents
Paper pulp molding container cover with dotted protrusions and hot-pressing die thereof Download PDFInfo
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- CN202858653U CN202858653U CN2012202894823U CN201220289482U CN202858653U CN 202858653 U CN202858653 U CN 202858653U CN 2012202894823 U CN2012202894823 U CN 2012202894823U CN 201220289482 U CN201220289482 U CN 201220289482U CN 202858653 U CN202858653 U CN 202858653U
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Abstract
The utility model discloses a paper pulp molding container cover with dotted protrusions. Wet body paper is directly subjected to hot-pressing forming between a male die and a female die of a hot-pressing die. According to the utility model, the hot-pressing die is particularly improved, and specifically, steam exhaust holes are formed in the male die at intervals; the diameter of the steam exhaust holes for forming the protrusions ranges from 0.55mm to 4mm; and the spacing between the adjacent steam exhaust holes for forming the protrusions ranges from 1mm to 20mm. The paper pulp molding container cover with the dotted protrusions is prepared by a method disclosed by the utility model, the smooth dotted protrusions are formed on the inner surface of the container cover, and the inner and outer surfaces are smooth planes. The product not only has smooth inner and outer planes and is attractive and practical, and also is suitable for being used as the container cover with a water collection function. The paper pulp molding container cover with the dotted protrusions and the hot-pressing die simplify the producing structure and improve the product performance.
Description
Technical field
The present invention relates to the manufacturing field of paper pulp moulding product, more particularly, relate to the improvement of paper pulp moulded container cap surface structure, and improved manufacture method and mfg. moulding die.
Background technology
The processing method of the paper pulp moulding product of prior art mainly realizes thermocompression forming with the l Water Paper embryo between the punch and matrix of hot pressing die.Problem is:
1, the present invention relates to paper pulp moulding product mainly is especially paper pulp moulded container, the container cover of liquid of food container.The paper pulp moulded container of prior art, the body wall of container cover is the uniform thickness setting, does not have the obvious projection more than or equal to 0.1mm.Owing to do not have an obvious projection, therefore do not have catchment etc. functional.When using the container cover of paper mould, beverage or steam can't be assembled in container cover inner surface absorption and drips back container, when opening container cover, the water droplet that covers absorption is scattered easily everywhere, and container cover is soaked also for a long time and can be had influence on waterproof effect.
2, add man-hour, in the thermocompression forming process, need to cover at the underlying mould of punch and matrix one deck 40-60 purpose wire netting, be beneficial to dredging of steam, avoid gas explosion can't make qualified products.At this moment, because the existence of wire netting, so that the surface that product contacts with the underlying mould is with coarse wire mark.
Paper mould is used for field of tableware, generally speaking be smooth, one side is used for splendid attire food, because rough surface, the paper pulp fiber burr exposes, and is very easy to slag with the one side of wire mark, if with it as inner surface, the one, in food, be mixed with easily impurity, be that the consumer can not accept, also be food law institute is unallowed; The 2nd, rough surface, food sticks difficult drop-off on it, the utmost point is not attractive in appearance, and the 3rd, when paper mould is used on the tableware, need to add waterproof, oil-proofing agent, and the tiny paper pulp fiber of rough surface, very easily break away from vessel surface, cause the paper pulp surface small cavity to occur, when splendid attire hot soup or hot beverage, infiltration, the wet phenomenon of spreading and sinking in appear in inner surface, reduce waterproof oil-proof result.
When paper mould is made container cover and is used, particularly bowl cover such as coffee cup cover, the people can touch, so outer surface is that the light face is better.And inner surface is wire side, and coffee certainly will contact repeatedly with the bowl cover inner surface in the hand-held process that moves and drink, and the paper pulp fiber of bowl cover will incorporate in the coffee, affects quality of coffee, and is unhygienic; And under the immersion of and coffee stifling at steam, the large-area stain of spreading and sinking on the bowl cover also is that the utmost point is not attractive in appearance.
So the dining utensil that the paper mould industry is produced can only be that smooth surface is inside, packing foods, beverage; And outside the coarse surface punching with wire mark, and this can have influence on the overall appearance of pulp vessel, so the product of paper mould is in low-grade level always, can't be promoted the use of on a large scale.
Smooth for appearance looks elegant, the two sides of accomplishing product, a kind of implementation of prior art is: allow first l Water Paper embryo drying machine oven dry or naturally dry, and then 30 tons even the shaping of more pressurizeing under the high pressure, make its two sides smooth.But the product that this method is made is thick, loose, and what the surface was easy to press chaps, and product can not be accomplished fineness.
Another kind method is applied to paper pulp moulding forming net mould and shape-fixing mesh mould with application of copper ball sintering process, adopt spherical powder processing hot pressing counterdie, but can only process simple mild structure, then fire difficult for the complicated abnormal shape structure, and fire and can not grind at all afterwards, can't do the fine setting on the size, otherwise the smalls that grinds can block eyelet, affects air permeable effect, and because the existence of hole between copper ball, can only be approximate smooth, still can see vestige, key is because hole between copper ball is too little, has a large amount of steam to be mingled with fiber fragment in the use and passes through, therefore as easy as rolling off a log obstruction can't be used in large-scale industrial production.
In addition, in the process of manufacture of the paper pulp moulding product of prior art, usual manner is the paper pulp of concentration about 0.5-1%, after vacuum forming on the wire netting, form the l Water Paper embryo, the l Water Paper embryo of this moment contains 70 ± 10% moisture, and this l Water Paper embryo also need to hot pressing oven dry on the thermal finalization mould.The temperature of the male and female mold of thermal finalization mould is generally about 150-250 ℃, contain in the process of the upper and lower closed pressing and stoving of l Water Paper indusium thermal finalization mould of 70 ± 10% left and right sides moisture, can produce a large amount of steam, so the paper mould industry must have some air-vents equably on the hot pressing counterdie, wire netting is set on the counterdie, realizes thermal finalization processing.In the production and processing of usual manner, cylinder pressure can reach the pressure of 2-30 ton at the 2-8 atmospheric pressure after the supercharge cylinders.With this understanding, upper and lower hot-die closes up, and at first can push the aqueous water of discharge about 20%, and all the other moisture are to be discharged by the exhaust hole on the hot-die by the net mould with the steam state form.
Summary of the invention
The present invention is intended to change the manufacture of prior art paper pulp moulding product, provides a kind of surfaces externally and internally to be the light face, and inner surface belt point-like projection is practical, have paper pulp moulding product a---container cover of water collecting function.The present invention has also improved and has produced the structure of the required hot pressing die of product, and then improved production method in order to realize this paper pulp moulding product, has reached the simplification production structure, the requirement of the quality of enhancing product performance.
The present invention provides countless projection conducts to catchment a little at the inner surface of container cover, for the water droplet drippage, and its principle following (with reference to the accompanying drawings 5-7):
According to one of the fundamental equation of surface chemistry Young's equation
cos θ=(γ
sv-γ
sl)/γ
lv
Wherein: γ
LvInterfacial tension between------liquid and gas
γ
SvInterfacial tension between------solid and gas
γ
SlInterfacial tension between------liquid and solid
Contact angle when θ is gas, solid, liquid three-phase equilibrium.It is believed that generally the surface of solids shows as hydrophobic property when θ＞90 °, show as hydrophilic nmature during θ＜90 °.
This shows that the angle of θ is the key of water droplet drippage.Through deep discussion, research repeatedly, we find finally, if change artificially the θ angle, will greatly change its hydrophilicity.When the inner surface that adopts the present invention in container cover increases catchmenting a little of countless projections, just can be so that the number of degrees people of θ be for reducing, little water droplet is more hydrophilic, gets off with regard to easier drippage.
The interfacial tension on droplet and paper pulp surface so that droplet is adsorbed on the inner surface of container cover, its interfacial tension vertically upward, this moment is because the gravity of water droplet self is adsorbed in the paper pulp surface less than interfacial tension.
When water droplet is in raised brim place on the inner surface, because water droplet is not to be on the horizontal plane, its interfacial tension can be decomposed into vertically upward pulling force and horizontal direction towards the pulling force of low spot direction that catchments of projection, at this moment, by the projection of catchmenting a little, capillary θ is reduced, and water droplet moves towards a low spot direction of catchmenting of projection.Being conducive to each little water droplet compiles mutually towards low spot.
A minimum point of catchmenting that is pooled to projection when countless little water droplets is when forming large water droplet, owing to compile the amplitude that the increase amplitude of the contact area of the water droplet that forms increases less than gravity, so gravity overcomes the effect of interfacial tension, drippage gets off.
In order to achieve the above object, the invention provides a kind of paper pulp moulded container lid with the point-like projection, the inner surface of container cover is provided with the point-like projection, and the inside and outside surface of container cover is smooth flat, and namely surfaces externally and internally is all without wire mark.It is emphasized that " smooth " plane that the present invention mentions illustrates that just these planes are " without wire mark " plane.In addition, the height of described projection is more than or equal to 0.1mm, and less than or equal to the body thickness of shaped article paper matrix, and projection also is smooth point-like projection; " smooth " refers to crowning " without wire mark " herein.Wherein, height of projection could form obviously projection during more than or equal to 0.1mm, and has certain functional.Thereby the present invention has changed the form of prior art paper pulp moulding product body wall uniform thickness, is further function setting, and setting attractive in appearance lays the first stone.
Under the optimal way, in order to make the paper pulp moulding product without wire mark, namely the two sides is the paper pulp moulding product of smooth surface.Described height of projection is 0.1-1mm, and diameter is 0.55-4mm; The spacing of adjacent described point-like projection is 1-20mm.
In order to improve the quality of product, so that processing is easier, under the optimum way, the diameter of point-like projection is 1-3mm; The spacing of adjacent described point-like is 5-10mm.
The point-like projection of container cover inner surface of the present invention, as catchmenting a little, general diameter is no more than 3mm greater than 0.55mm; Height is no more than 1mm greater than 0.1mm.
The present invention also provides the processing method of above-mentioned paper pulp moulded container lid with the point-like projection, and concrete grammar is: with the direct thermocompression forming between the punch-die of hot pressing die of l Water Paper embryo; Wherein, on the punch-die all without the wire netting mould.Interval mode arranges exhaust hole on the described punch; Wherein, being used to form protruding described exhaust hole diameter is 0.55-4mm; The spacing that is used to form the adjacent described exhaust hole of projection is 1-20mm.
Under the optimal way, the described exhaust hole diameter that is used to form projection is 1-3mm; The adjacent spacing that is used to form the described exhaust hole of projection is 5-10mm.
For above-mentioned processing method, the present invention also provides a kind of hot pressing die, comprises punch and the die of direct clamping l Water Paper embryo realization thermocompression forming, and interval mode arranges exhaust hole on the described punch.Be with prior art difference part, on the punch-die all without the wire netting mould.Wherein, being used to form protruding described exhaust hole diameter is 0.55-4mm; The spacing that is used to form the adjacent described exhaust hole of projection is 1-20mm.
Under the optimal way, the described exhaust hole diameter that is used to form projection is 1-3mm; The adjacent spacing that is used to form the described exhaust hole of projection is 5-10mm.
According to mentioned above, the exhaust hole that the present invention mentions is mainly used in getting rid of the exhaust hole of water vapour.Wherein, the present invention defines the size of specific region exhaust hole in the punch in order to form the point-like projection at the product ad-hoc location.Specifically, being used to form protruding described exhaust hole diameter is 0.55-4mm; The spacing that is used to form the adjacent described exhaust hole of projection is 1-20mm.
Paper pulp moulding product and the processing method thereof of the level and smooth bulge-structure of band of the present invention have been abandoned the required wire netting of hot pressing die, the generation with directly between punch-die direct heat molded, be smooth surface thereby reach the paper pulp moulding product two sides.Because, all hot pressing dies under the prior art, the wire side that the molded surface of punch-die must arrange wire netting is smooth, and therefore shaped article of the present invention has the smooth advantage in two sides than prior art.
The present invention directly has logical steam vent on mould, need not additionally to increase the net mould again.And offer the hole on the punch, reach the effect of draining, steam discharge.
For the position that makes the product corresponding aperture forms smooth projection, the present invention defines pore structure, thereby final so that the projection on the product has the effect of catchmenting.Particularly the present invention defines the gap size in hole, under the prerequisite that does not change the prior art processes parameter, not only can realize projection, and can guarantee the smooth of projection.And select the gap size in the hole different from the present invention, can't reach required processing effect.Specifically, when the aperture of opening 0.3-0.5mm, can't form obvious projection; And when offering greater than the 4mm hole, projection then occurs easily breaks, and the problem of burr appears in product, particularly along with the increase of pore-size, break or Burr Problem also can increase, and then product quality reduces gradually.
The l Water Paper embryo is to be formed by paper pulp fiber free settling, and generally speaking surface and out-of-flatness are smooth, so need the hot pressing of hot pressing die to plate, when aperture during less than 3mm, though the point of projection is smooth with respect to the hot-pressed surface out-of-flatness, but because surface area is also little, and not obvious, can accept.But when greater than 3mm, the one, surface area increases, and is too coarse obvious, and the people can't be accepted; The 2nd, the aperture is larger, and the projection of generation is higher, and then adhesion is limited between fiber, certainly will rupture, and the surface of projection forms the splitting traces of paper pulp.
To sum up, overall structure of the present invention is not only inside and outside to be the light face, attractive in appearance, practical, and has specific function, suitable bowl cover as water collecting function.The present invention has also improved and has produced the structure of the required hot pressing die of product, and then improved production method in order to realize paper pulp moulding product, has reached the simplification production structure, the requirement of the quality of enhancing product performance.
Description of drawings
Fig. 1 is the interior orthographic projection structural representation of container cover lid that paper mould of the present invention is made;
Fig. 2 is the perspective view of container cover shown in Figure 1;
Fig. 3 is the side-looking structural representation of container cover shown in Figure 1;
Fig. 4 is the hot pressing die working state structure schematic side view of making container cover shown in Figure 1;
Fig. 5 is the principle explanation schematic diagram that catchments in the plane;
Fig. 6 is that the principle of catchmenting on the container cover of the present invention a little illustrates schematic diagram;
Fig. 7 is the principle explanation schematic diagram of the water droplet state before the minimum point drippage that catchments shown in Figure 6.
The specific embodiment
The present invention is by directly cancelling wire netting at hot-die, and offer the pass of some, timely steam discharge when accomplishing thermocompression forming by intensive open-work neither produces wire mark, can utilize again exhaust hole to produce smooth dot structure, play the function of catchmenting without wire mark.Specifically, the paper pulp moulding product of the level and smooth bulge-structure of band of the present invention is mainly as having the container cover of water collecting function.
The present invention can reach the purpose of draining steam discharge in the point-like projection that container cover adopts, and the decorative pattern combination is beautiful, without the paper scrap slag-off phenomenon, can form again simultaneously and catchment a little.
As illustrated in fig. 1 and 2, formed point-like projection 3 in the lid, the some height of projection is greater than 0.1mm, when being no more than 1mm, can be used for catchmenting a little of container cover such as coffee cup cover, that is to say, the inner point-like projection that forms of bowl cover, can play the effect of catchmenting, namely steam can compile to this low spot of round dot of projection after bowl cover condenses into little water droplet, forming large water droplet falls back in the cup, and can avoid the bowl cover surface to be immersed in for a long time in the water, and can prolong water-proofing time, strengthen waterproof effect.
The inner surface of container cover is provided with the point-like projection, and wherein, the diameter of point-like projection is 0.55-4mm; The spacing of adjacent point-like projection is 1-20mm.Under the optimal way, spot diameter 1-3mm, dot spacing are 5-10 ㎜.
Processing method of the present invention is: on the mould in the paper mould hot pressing die, remove common net mould, suitably add large opening rate, increase exhaust hole, so that drainage effect meets the explained hereafter needs, can accomplish to discharge rapidly steam, do not affect product quality.Open-work diameter on the mould is at 0.55-4mm, and the perforate interval is no more than 20mm.
As shown in Figure 4, label 4 is die, and label 5 is punch, and label 6 is for forming the exhaust hole of point-like projection.
When the l Water Paper indusium was transferred on the hot pressing die, moisture should remain on about 70 ± 10%, and moisture surpasses 80%, and water content is excessive, during convex-concave hot-die matched moulds, can produce a large amount of steam, be unfavorable for the moment steam discharge, easily produce gas explosion, a large amount of steam also can be taken away a large amount of heats in addition, is unfavorable for energy-conservation.Moisture needs to strengthen the power of vacuum machine less than 60%, increases the working time of vacuum machine, and the effect that moisture reduces is but also not obvious, and this also is a kind of waste.
In the actual production processing of paper mould, the moisture content of l Water Paper embryo is about 70 ± 10%, and hot pressing punch-die temperature is between the 150-250 degree, and cylinder pressure can reach the pressure of 2-30 ton at the 2-8 atmospheric pressure after the supercharge cylinders.With this understanding, the convex-concave hot-die closes up, and at first can push the aqueous water of discharge about 20%, and all the other moisture are to be discharged by the exhaust hole on the hot-die by the net mould with the steam state form.
Hole density is selected:
Realization is removed the net mould and the paper pulp smooth surface, needs to select suitable hole density, accomplishes to discharge smoothly steam.
Prior art, band net mould processing 4 gram left and right sides paper matrix bowl cover products, as 180 ° of C of patrix temperature, 200 ° of C of counterdie temperature, cylinder pressure 4 atmospheric pressure, hot pressing time are about 45 seconds, product can be dried, make qualified products, and the aperture 2.0mm under this moment net mould, pitch of holes 20mm.
Only removing the net mould in the constant situation of the conditions such as other temperature, pressure, below for the present invention not with hole density and the hot pressing time relation of net mould.
| Pitch of holes mm | Hot pressing time (second) | Explanation |
| 20 | 150 | Time is longer |
| 10 | 60 | Time is slightly long |
| 5 | 45 | Time is suitable with band net mould |
By above experiment, the method for prior art is described, only remove the net mould and do not change the steam discharge discharge structure, hot pressing time is long, and is long than the hot pressing time of common net mould, is unfavorable for very much quick production, improved production cost.
When pitch of holes 10mm, moisture can very fast discharge, and is just very close with hot pressing time with the net mould, can accept.
Pitch of holes 5mm, just just the same with the hot pressing time with the net mould.
So under existing paper mould manufacturing condition, pitch of holes should be no more than 20mm, optimal spacing is about 5-10mm.Surpass the 20mm spacing, need of production reduces hot pressing temperature, prolongs hot pressing time, reduces production efficiency, loses more than gain.
The diameter in hole is selected: when the diameter in hole too large, when surpassing 4.0mm, under above-mentioned actual production conditions, the salient point that its paper pulp surface extrudes, the surface is easy to produce slight crack, and the salient point of compacting is loose not tight, there is not structural strength, so should be no more than 4.0mm for well.
When the diameter in hole too little, during less than 0.5mm, the salient point that suppresses, projection is too little, does not have actual functional effect, and because the aperture is too little, processing cost is high also to be stopped up easily, is difficult for forming serialization production.
So under the best working condition, pore diameter range is about 0.55-4mm.
The arrangement in hole is selected: satisfying under the selection prerequisite in above-mentioned hole, the hole can be arranged in various patterns or decorative pattern, to improve the aesthetics of product.
The principle explanation of catchmenting in the prior art plane such as Fig. 5.The interfacial tension of water droplet vertically upward, this moment is because the gravity of water droplet self will be adsorbed in the paper pulp surface less than interfacial tension.Fig. 6 is that the principle of catchmenting on the container cover of the present invention a little illustrates schematic diagram; When water droplet is in raised brim place on the inner surface, its interfacial tension can be decomposed into vertically upward pulling force and horizontal direction towards the pulling force of low spot direction that catchments of projection, can see that capillary θ reduces this moment, and water droplet moves towards a low spot direction of catchmenting of projection.Fig. 7 is the principle explanation schematic diagram of the water droplet state before the minimum point drippage that catchments shown in Figure 6.Countless little water droplets is pooled to a minimum point of catchmenting of projection, the size that can see interfacial tension is to be determined by the contact area of water droplet and paper pulp, but owing to compile the amplitude that the increase amplitude of the contact area of the water droplet that forms increases less than gravity, so gravity overcomes the effect of interfacial tension, drippage gets off.
The above; only be the better specific embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, all should be encompassed within protection scope of the present invention.
Claims (6)
1. the paper pulp moulded container lid with the point-like projection is characterized in that the inner surface of described container cover is provided with the point-like smooth bumps, and described container cover surfaces externally and internally is smooth flat.
The height of described projection is more than or equal to 0.1mm, less than or equal to the body thickness of shaped article paper matrix.
2. described paper pulp moulded container with the point-like projection covers according to claim 1, it is characterized in that described height of projection is 0.1-1mm, and diameter is 0.55-4mm; The spacing of adjacent described point-like projection is 1-20mm.
3. described paper pulp moulded container with the point-like projection covers according to claim 2, it is characterized in that the diameter of described point-like projection is 1-3mm; The spacing of adjacent described point-like is 5-10mm.
4. described paper pulp moulded container with the point-like projection covers according to claim 2, it is characterized in that, and the point-like projection of described container cover lower surface, as catchmenting a little, diameter is no more than 3mm greater than 0.55mm; Height is no more than 1mm greater than 0.1mm.
5. processing hot pressing die with the paper pulp moulded container of point-like projection lid comprises it is characterized in that punch and the die of direct clamping l Water Paper embryo realization thermocompression forming,
Interval mode arranges exhaust hole on the described punch;
Wherein, being used to form protruding described exhaust hole diameter is 0.55-4mm; The spacing that is used to form the adjacent described exhaust hole of projection is 1-20mm.
6. the processing hot pressing die of described paper pulp moulded container lid with the point-like projection according to claim 5 is characterized in that being used to form protruding described exhaust hole diameter is 1-3mm; The adjacent spacing that is used to form the described exhaust hole of projection is 5-10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202894823U CN202858653U (en) | 2012-06-19 | 2012-06-19 | Paper pulp molding container cover with dotted protrusions and hot-pressing die thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202894823U CN202858653U (en) | 2012-06-19 | 2012-06-19 | Paper pulp molding container cover with dotted protrusions and hot-pressing die thereof |
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| Publication Number | Publication Date |
|---|---|
| CN202858653U true CN202858653U (en) | 2013-04-10 |
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ID=48025422
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012202894823U Expired - Lifetime CN202858653U (en) | 2012-06-19 | 2012-06-19 | Paper pulp molding container cover with dotted protrusions and hot-pressing die thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103504928A (en) * | 2012-06-19 | 2014-01-15 | 江峰 | Pulp-molded container cover with dotted protrusions and processing method and hot-pressing die thereof |
| WO2023193348A1 (en) * | 2022-04-08 | 2023-10-12 | 浙江舒康科技有限公司 | Pulp molded container lid, container assembly and processing process |
-
2012
- 2012-06-19 CN CN2012202894823U patent/CN202858653U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103504928A (en) * | 2012-06-19 | 2014-01-15 | 江峰 | Pulp-molded container cover with dotted protrusions and processing method and hot-pressing die thereof |
| CN103504928B (en) * | 2012-06-19 | 2016-06-29 | 江峰 | The paper pulp moulded container lid protruding with point-like and processing method thereof and hot pressing die |
| WO2023193348A1 (en) * | 2022-04-08 | 2023-10-12 | 浙江舒康科技有限公司 | Pulp molded container lid, container assembly and processing process |
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| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130410 Effective date of abandoning: 20160629 |
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