CN206066990U - Impregnation mold - Google Patents

Abstract

The utility model is related to impregnation mold.A kind of impregnation mold for impregnating molded articles for production by made by the thermoplastic strengthened with glass fibre.

Description

Impregnation mold

Technical field

The utility model is related to a kind of impregnation mold.More specifically, the utility model is related to a kind of for producing by heat The impregnation mold of molded articles is impregnated made by plastic material.

Background technology

Such as gloves, sacculus, condom and other items gather typically by mould is immersed in the liquid for molded articles It is obtained in compound bath.Liquid polymer is coated on mould, and forms one layer on the mold surface in its condensation and after being dried Polymer, shape of this one polymer in mould.This one polymer will form dipping molded articles.Such mould is referred to as dipping Mould.

Dipping molding process is supermatic and dipping is obtained in the equipment or batch device for be provided with conveyer belt Molded articles, wherein many moulds are immersed in liquid polymer bath every time.After immersion, it is coated with liquid polymer thin The impregnation mold of film leaves the bath.Impregnation mold has significant weight in the dipping process for producing dipping molded articles The property wanted.There may be use so that liquid polymer can adhere to the pre-preg process step of impregnation mold, and will impregnate Molded articles carry out the rear impregnation process step for for example leaching, vulcanizing and be dried from before impregnation mold peeling.

Impregnation mold be simulate object shape and enable dipping molded articles corresponding to the body form into The structural elements of type.The finished machined or superficial makings of mould can have homogeneous texture or can be smooth, to produce table Face is uniform（It is inside and outside）And the dipping molded articles without any surface irregularity or impression.Due to impregnating molded articles Retail price is generally relatively low, so production cost must keep minimum to realize desired profit.Therefore, the production cost of mould must Low and mould must be kept to provide long-term reusability to improve cost effectiveness.

Pottery, porcelain and glass are the common used materials for manufacturing impregnation mold.However, such material is frangible.By this class Impregnation mold made by material needs handled, and the threat of danger when which ruptures, is then caused to staff.Due to The frangible property of such material, impregnation mold not strong resistance must be lived mechanical shock and thermal shock and be caused crack to cause what is ruptured Stress.Made by previously mentioned material, impregnation mold also shows the porous due to chemical attack, so as to affect Superficial makings.For example, microdot erosion or hole will be caused plus the cerdip mould endangered by hot conditions by chemical attack, and The dipping molded articles for causing to be molded can be had defect by this.When impregnation mold surface in the way of chemical attack or crack quilt During harm, just impregnation mold must be carried out properly to dispose to avoid its rupture from fragmentating.

As mentioned before, the production cost for impregnating molded articles must keep minimum, however, using by weight and frangible Material（For example, pottery, porcelain and glass）Made by impregnation mold come manufacture dipping molded articles increased dipping molded articles it is total Production cost.The transport of weight and frangible impregnation mold or shipment cost are generally higher, and inadvertently falling off for impregnation mold will be led Mould fracture is caused so as to cause potential loss.When transporting or ship such impregnation mold, it is necessary to which impregnation mold is divided among Individually in compartment preventing which from bumping against each other.Sum it up, unsatisfactory to make impregnation mold by heavy and frangible material.

Plastics are alternative heavy and frangible materials, are commonly used for manufacturing impregnation mold.

U.S. Patent number 3,363,284 discloses a kind of impregnation mold being made of plastics, and the plastics are epoxy resin With polyurethane resin and the mixture of suitable curing agent or catalyst.Plastics impregnation mold lightweight, it is durable and be easy to storage. However, its in terms of heat dissipation less effectively, and therefore need after be immersed in it is high outward Portion's heat energy is used for the be coated with liquid polymer of drying.Required heating increased the cost of production dipping molded articles.

With the polyphenylene sulfide that 14-20% ceramic powders are strengthened（PPS）Plastics have enhanced thermal conductivity.By with ceramic powder In terms of heat dissipation more effectively, which automatically promotes be coated with liquid polymer faster to impregnation mold made by the PPS at end Ground is dried, so as to cause low-energy-consumption and higher manufacture speed in terms of manufacture dipping molded articles.Plastics impregnation mold Several parts are commonly manufactured as, subsequently these parts link together.Separate part is linked together into presence admittedly Some difficulties.For example, die parting line is obvious, joint is uneven and/or seam loosely.This is undesirable, because uneven surface Defect will be produced in the dipping molded articles for being produced, and/or joint loosely by reduction of service life and reduces impregnation mold Reusability.

The utility model is it is intended that solve some or all of problems of prior art.

Utility model content

According to one side of the present utility model, there is provided it is a kind of for production by include with glass fibre strengthen polyamide The impregnation mold of molded articles is impregnated made by the material of 4T.

In one embodiment, the material includes the polyamide 4T strengthened with 30% glass fibre.

In a further embodiment, in the way of injection-molded producing impregnation mold.Material used make it possible to by The injection-molded part of impregnation mold welds together, preferably in the way of Vibration Welding or ultrasonic are welded.

Before welding, following pre-welding step can be adopted：Injection mould at a temperature of 160-230 DEG C to impregnation mold Part processed carries out annealing and lasts 5-10 minutes.Preferably, annealing can be implemented at a temperature of 160 DEG C and lasts 5 minutes.

In other aspect of the present utility model, there is provided the material of the polyamide 4T for including strengthening with glass fibre is used In production impregnation mold.

In one embodiment, the material includes the polyamide 4T strengthened with 30% glass fibre.

In other aspect of the present utility model, exist it is a kind of for production by include with glass fibre strengthen polyamides The method of impregnation mold made by the material of amine 4T.The method comprising the steps of：

I) preparation includes the mould of cavity body of mould and mold insert；

II) material of the polyamide 4T for including strengthening with glass fibre is provided, and by injection-molded producing dipping former The some of tool；And

III) by welding connecting injection-molded part.

In one embodiment, can implement to last the injection-molded cycle of about 30-80 seconds, and preferably greater than 45 seconds with On.

In a further embodiment, the injection-molded of material can be implemented under the pressure of about 110-120MPa.

In different embodiments, the opening stroke of injection-molded process can be about 120-155mm.

In a further embodiment, before step III, injection-molded part can be repaired in edge to remove Any unnecessary material.

In one embodiment, before step III, injection-molded part can be carried out at a temperature of 160-230 DEG C Annealing lasts 5-10 minutes.Preferably, annealing can be carried out to injection-molded part at a temperature of 160 DEG C and lasts 5 minutes.

In a further embodiment, can be in the way of Vibration Welding or ultrasonic be welded by the injection-molded portion of impregnation mold Divide and weld together.In step III, can the amplitude of 0.2-1.00mm, the pressure of 3.2MPa, the total depth of 0.81mm, Implement the weldering to injection-molded part under the frequency of 230.5Hz, the entire cycle time of the weld interval of 5.61 seconds and 26.8 seconds Connect.

In different embodiments, after step III, impregnation mold can be repaired in seam crossing outwards to remove out The unnecessary material for highlighting.

Impregnation mold of the present utility model has toughness, chemical resistant（For example, it is acidproof and alkaline-resisting）, lightweight and not Frangible.For manufacturing the thermoplastic of impregnation mold due to the addition of glass fibre so that hardness strengthens.The material foot It is enough strong and being capable of resist chemical.The lightweight of impregnation mold and non-friable property allow processing ease and elimination is by inadvertently falling off The possible crack for causing or fracture.

This impregnation mold has high heat conductance, so as to efficiently reduce during production dipping molded articles（Particularly exist Afterwards during impregnation process）Energy ezpenditure.High heat conductance allows to apply liquid polymer by means of from the heat transfer of impregnation mold Layer is heated from inner homogeneous.

It is injection-molded mainly for the production of the article by made by thermoplastic.For producing dipping former of the present utility model The thermoplastic of tool produces homogeneous melt at high temperature.Homogeneous melt is needed during injection-molded process.It is injection-molded to go back Can allow for impregnation mold and there is variable inner thickness section, to provide different intensity profiles and heat distribution when needed （With reference to increased heat conductivity value）.Or, using uniform thickness all the time.

For impregnation mold complicated and in irregular shape, it is necessary to by injection-molded come some sections of construction or at least two Individual identical half portion, subsequently connects together.The different sections of impregnation mold of the present utility model can be welded on one Rise.High weld strength is realized in the commissure of the injection-molded part of impregnation mold of the present utility model.The pairing of the section The material at end is fused together and is distributed with the material for realizing whole homogeneous.Sealed throughout whole weld seam and without any gap Impregnation mold makes it possible to produce flawless dipping molded articles.

The additional advantage of impregnation mold of the present utility model will be elaborated in herein below.

Description of the drawings

The following description to embodiment carried out by referring to accompanying drawing is illustrating the utility model, but the utility model is simultaneously It is unrestricted, in the accompanying drawings：

Fig. 1 is illustrated according to the impregnation mold for manufacturing gloves of the present utility model.

Fig. 2 a are illustrated according to the front view for manufacturing the impregnation mold of gloves of the present utility model.

Fig. 2 b are illustrated according to the rearview for manufacturing the impregnation mold of gloves of the present utility model.

Fig. 2 c are illustrated according to the rearview for manufacturing the impregnation mold of gloves of the present utility model.

Specific embodiment

Impregnation mold of the present utility model is made up of thermoplastic that being strengthened based on nylon and with glass fibre.Nylon It is polyamide 4T（Nylon 4T）.Preferably, thermoplastic is strengthened with 30% glass fibre.Thermoplastic used Not halogen-containing and phosphorus.

The embodiment of impregnation mold of the present utility model is as shown in Figure 1.

For producing high Glass Transition temperature of the thermoplastic of impregnation mold with 325 DEG C of high melting temperature, 125 DEG C Degree, high rigidity and agent of low hygroscopicity.Which has the thermal conductivity value range of about 2-10 Watts/m.K, and which is that corrosivity is minimum Thermoplastic in one kind.Generally speaking, when compared with other types of plastics, thermoplastic used in the utility model Property material goes up excellent property in many aspects.

The details of the property with regard to thermoplastic are outlined in following table.

It has been found that impregnation mold at least has following physical property by made by thermoplastic：

1. there is toughness（That is, hard）, it is durable and non-friable；

2. resist chemical（For example, it is acidproof and alkaline-resisting）；

3. lightweight；And

4. high heat conductance.

Above-mentioned physical property is explained fully in the Examples section of specification ending.

Impregnation mold of the present utility model causes which that easy fracture is not allowed after physical impact due to the toughness of material.For The thermoplastic of manufacture impregnation mold strengthens its hardness due to the addition of glass fibre.Inadvertently falling off for impregnation mold will not Cause impregnation mold fracture or be broken into piece.In addition, impregnation mold can sustain in order to clean the purpose of impregnation mold it Long-time mechanical chipping on surface.

The material of impregnation mold being capable of resist chemical.Even if at high temperature with corrosive chemicals（For example, nitric acid or Alkali）After long time period ground is contacted repeatedly, the superficial makings of impregnation mold remains uniform and imporous.In exposure extremely The material for impregnating molded articles chemicals being made from it can be affected or change is unlikely to occur in surface.

The lightweight of impregnation mold and non-friable property cause processing ease, particularly when impregnation mold is transported.This is It is favourable, because which reduce transport and ship cost, and eliminate by inadvertently falling off the possible crack or fracture that cause.Separately Outward, when drive just carrying impregnation mold conveyer belt is installed production equipment when, less energy will be consumed.

Toughness and chemical resistance extend the reusability of impregnation mold.

The high heat conductance of impregnation mold is effectively reduced during the manufacture of manufacture dipping molded articles（Particularly in example Such as during the rear impregnation process of the drying of liquid polymer coating）Energy ezpenditure.High heat conductance allows to cross over impregnation mold The mode of the heat transfer on surface makes liquid polymer coating be heated from inside.It is poly- to liquid across the heat transfer on impregnation mold surface Compound coating provides uniform heat distribution, so that it is guaranteed that molded articles will impregnated from its all region before impregnation mold peeling Fully it is dried.In this example, heat stems from inside impregnation mold.In a word, shorter arid cycle can be adopted, so as to can The manufacturing cost of dipping molded articles can be reduced.

The material of the impregnation mold can be used in manufacture blow molding impregnation mold or injection-molded impregnation mold.So And, impregnation mold of the present utility model can be manufactured using any suitable manufacturing process.Impregnation mold can be made into single construction, If or can be made into stem portion, these parts are connected after a while or weld together.Fig. 2 a, Fig. 2 b and Fig. 2 c are illustrated to have therebetween and are poured Two identical half portions are being connected or are welding together it by two identical half portions of the injection-molded impregnation mold of mouth, the cast gate It is front to be removed.It is mentioned that the material using in the way of injection-molded during manufacturing impregnation mold being Especially advantageous.

For impregnation mold complicated and in irregular shape, metal injection or it is injection-molded be preferred.Possibility must Several parts or at least two same sections must be manufactured first, be subsequently welded to together.For example, use for producing operation The impregnation mold of gloves may include three injection-molded parts, and the impregnation mold for being used to produce examination gloves may include two Injection-molded part.

The thickness profile of impregnation mold can be uniform or with variable thickness.Preferably, the thickness of impregnation mold Scope is 2-3mm.

The thermoplastic of the polyamide 4T strengthened with glass fibre will be included for via injection-molded manufacturing dipping Mould has following enormous benefits：

1. homogeneous melt is realized when higher than 330 DEG C；

2. close manufacturing tolerance；

3. low-energy-consumption；

4. it is high to manufacture speed；And

5. variable thickness on finished product, detailed design and mark are allowed.

On other factory's proprietary formula compositions, thermoplastic may further be enriched with the glass fibre of various percentages and contain Amount, to obtain required property（Such as hardness, thermal conductivity, chemical resistance and processing mold flowing property）.Preferably, add 30% glass fibre is with the hardness of reinforced thermoplastics.In addition to the hardness of reinforced thermoplastics, the glass fibre for being added Amount also by other processing requests determining.

Selected resin（For example, including the polyamide 4T strengthened with 30% glass fibre thermoplastic variant）Quilt As the injection-molded raw material for molding part.The type of the variant of resin depends on the required property of impregnation mold, example Such as hardness, chemical resistance, high temperature resistant and wear resistance and the surface tension energy value for excellent wettability.

The shape and configuration that can model to determine preferable impregnation mold using computer.Then Rapid Prototype Design side can be passed through Method（For example, 3-D is printed）Come the sample of impregnation mold determined by producing.These samples are tested, to produce dipping molded articles And obtain basic physics and size measuring.After shape and configuration satisfied and that confirm impregnation mold, give birth to followed by adopting The metal injection mould of product scale, which includes cavity body of mould and mold insert.

In order to produce the impregnation mold with textured surface, mold cavity surface can be matched with expected superficial makings, and This can be stamped on the surface of molding part.Alternately, sandblasting or grit blast can be carried out to injection-molded part in outside, with Superficial makings needed for producing.

Injecting molding machine used depends on the thickness of impregnation mold to be produced, and can have 200-350 mT's Capacity.Thermoplastic will be melted at a temperature of 330-340 DEG C first, and will be subsequently injected in about 100-150 DEG C At a temperature of metal injection mould.It is desirable that the 30-80 seconds are about including injection and the injection-molded cycle time for cooling down, it is excellent Selection of land is longer than more than 45 seconds, and injection pressure is about 110-120MPa and opening stroke is about 120-155mm.

The unnecessary material of the edge positioned at injection-molded part can be trimmed.

After manufacture different piece, can be using Vibration Welding, ultrasonic welding or any other suitable welding method So that injection-molded part to be linked together.

Vibration Welding or ultrasonic welding are preferably as can not introduce any not phase for these sections are connected Reliable combination is realized in the case of closing material.At with opposite end, material is fused together to realize with high weld strength Combination.Therefore, impregnation mold has the material distribution of whole homogeneous.

Pre-welding step can be adopted, to produce higher weld strength.Higher than glass transformation temperature in about 160- Annealing is carried out to injection-molded part under 230 DEG C of high heat level and lasts 5-10 minutes, 5 minutes are preferably lasted at 160 DEG C. By by infrared beam focus on injection-molded part with abutment joint, hyperpyrexia can be produced.

To carry out Vibration Welding, it is preferable that can adopt the amplitude of 0.2-1.00mm, the pressure of 3.2MPa, 0.81mm it is total Depth, the frequency of 230.5Hz, the entire cycle time of the weld interval of 5.61 seconds and 26.8 seconds.After welding process is completed, can The excess stock for outwards highlighting of seam crossing is repaired by automatic machinery people equipment or any other suitable method.Can hide Firmly connect or welding portion, subsequent butt joint or seam carry out sandblasting to obtain smooth surface.

In order to produce superficial makings, can be etched using laser surface.

The section for connecting impregnation mold of the present utility model does not have difficulties, and easily can realize throughout welding The seal line of line/weld seam.Pre-welding step is for matching edge heating and discharging cumulative stress to injection-molded part Preliminary measure.When high pressure and relative motion is forced in the interface for matching edge during welding process, the material quilt of preheating It is welded together to realize there is high weld strength and combination very close to each other between sealing wire/weld seam.Homogeneous surface for Manufacture surface is uniform（It is inside and outside）And the dipping molded articles without any surface irregularity, impression or gap are important 's.By no defect in the dipping molded articles produced using impregnation mold of the present utility model.

Example

The example below illustrates different aspect of the present utility model.This example is not intended to limit the utility model, the utility model Scope be set forth in appended claims.

For the gloves impregnation mold tested.In addition to MD25, by the impregnation mold tested make two it is identical Half portion, and subsequently connect or weld together.The impregnation mold of four types tested（4）Details it is as follows：

1. the impregnation mold of the form of MD25-by made by ceramics in single construction；

The impregnation mold of 2 D3G-by made by the thermoplastic strengthened with glass fibre, which is in the form of identical half portion, And these identical half portions are linked together by glue；

3. the impregnation mold of D3-by made by the thermoplastic strengthened with glass fibre, which is in the form of identical half portion, And these identical half portions are fetched by vibratory weld and are welded together；

4. the impregnation mold of D10-by made by the thermoplastic strengthened with glass fibre, which is in the shape of identical half portion Formula, and these identical half portions are fetched by vibratory weld and welded together, the Vibration Welding with 160 DEG C to the phase Carry out annealing the pre-welding step for lasting 5 minutes with half portion.

D10 is impregnation mold of the present utility model.

Stage 1

Film forming

On different impregnation molds, the result of film forming is listed in table 1 below.

Film forming of the table 1. on different impregnation molds

Impregnation mold	Film forming at palm	Film forming at side
			MD25	Good filming	Seamless line
D3（Using glue）	Good filming	Serious jointing line
			D3	Good filming	Slight jointing line
D10	Good filming	Seamless line

In a word, the impregnation mold of all Jing tests has good film-formation result at palm area.However, due to dipping Be present slight gap in the seam crossing between two identical half portions of mould, observe tight at the side of the produced gloves of D3G The jointing line of weight.Slight jointing line is observed at the side of the produced gloves of D3.

Stage 2

The property of dipping molded articles

The measured property of produced dipping molded articles is tabulating in table 2.

The property of the dipping molded articles that table 2. is produced by different impregnation molds

Generally, in the middle of the impregnation mold tested, impregnation mold D10 has highest physical property.

Stage 3

The Temperature Distribution of different types of impregnation mold

The Temperature Distribution of the finger, webs and palm area in different impregnation molds is measured, and result is listed in table 3 Lattice.

The Temperature Distribution of 3. impregnation mold of table

Observe, 3 minutes afterwards, and MD25 has minimum temperature in finger, webs and palm area.Generally, MD25 Temperature Distribution is substantially less than the impregnation mold tested by other.Observe, 3 minutes afterwards, D3G, D3 and D10 have higher than MD25 Temperature Distribution.

Conclusion

Thus the stage 1 of example is, it is evident that MD25 and D10（Impregnation mold of the present utility model）Zero defect can be produced Dipping molded articles.Observe in the stage 2, in the middle of the impregnation mold tested, D10 has highest physical property.Base The Temperature Distribution of the impregnation mold tested in the stage 3 of this example, MD25 have most at finger, webs and palm area Low temperature.

Production dipping molded articles are suitable for based on the impregnation mold of the result of this example, MD25 and D10.However, being used for The material for making MD25 is heavy and frangible, and due to its fugitiveness（Because which presents many after chemicals are continually exposed to Permeability）And careful operation is needed, so which is not preferable material.Additionally, with by the thermoplasticity material strengthened with glass fibre Made by material, D3G, D3 are compared with D10, and the Temperature Distribution of MD25 is low.

D10 is preferable impregnation mold, because its seamless dipping molded articles of generation, with high physical property and having High Temperature Distribution.

As those skilled in the art will be readily apparent, without prejudice to scope of the present utility model or essential characteristic In the case of, the utility model easily can be produced in other specific forms.Therefore, the present embodiment will be considered merely as be Illustrative and not restrictive, scope of the present utility model is specified by claims rather than preceding description, and therefore is fallen All changes in the range of entering are intended to be contained therein.

Claims (2)

1. a kind of gloves impregnation mold, wherein,

The impregnation mold includes uniform and non-porous superficial makings；

The impregnation mold has uniform or variable thickness profile, and the scope of the thickness profile is 2-3mm；

The different sections or half portion of wherein described impregnation mold weld together the material for causing to realize whole homogeneous and are distributed, and Whole weld seam is sealed and without any gap；And

The impregnation mold is without surface irregularity, impression or gap.

2. a kind of gloves impregnation mold, wherein,

The impregnation mold is made up of the material of the polyamide 4T for including strengthening with glass fibre；And

The impregnation mold includes uniform and non-porous superficial makings；

The impregnation mold has uniform or variable thickness profile, and the scope of the thickness profile is 2-3mm；

The different sections or half portion of wherein described impregnation mold weld together the material for causing to realize whole homogeneous and are distributed, and Whole weld seam is sealed and without any gap；And

The impregnation mold is without surface irregularity, impression or gap.