Sep 05 2016

Successful China Composite Expo 2016

Category: SMC mould maker,exhibitionAlice @ 8:38 am

Based on East Asia,the most economically-vigorous region in the world.China Composites Expo,attracted exhibitors from about 20 major world economies and visitors from more than 60 countries.

Ningguang Mould take part in this exhibition,attracting a lot of customers come to visit our booth.Huangyan NingGuang Mould is a company specialized  in  making SMC,BMC ,GMT mould, have abundant experience on mould designing and mould building.

With the rapid growing in recent decades,the visitors is also much widening in China,Composite materials have been widely used in Auto,aircraft,boat,construction……

Alice Chen
MOBILE PHONE:+8613989617789
Skype : alicechen40

Jul 29 2016

Surface Properties Of SMC Parts

Category: SMC mould maker,plastic crate mouldAlice @ 8:06 am

Surface quality is comparable is importance to mechanical properties in SMC compression-molded parts,particularly in automotive applications.Several sypes of defects are  frequently encountered such as surface waviness,sink marks,fiber readout,blisters,and pores.

Surface waviness,as the texture on the surface of an SMC part that is left by replication of an existing pattern on the surface of the mold or from residual stresses in the molded parts that remain after molding.Some of these defects can be avoided by careful preparation of the mold surface.

Sink marks appear above ribs and bosses in molded parts.These are caused by heterogeneous distribution of fibrous reinforcement,fillers,and resin.This,in turn,leads to nonuniform coefficients of thermal expansion or shrinkage behavior during curing.Directly above ribs,there may be a fiber-deficient area that exhibits a much larger thermal expansion coefficient .when cooled,this fiber-deficient area will shrink more than surrpinding areas,causing the sink.Consequently,these phenomena are very sensitive to the surface composition of SMC parts which can be analyzed by infrared spectriscopy technique …….

Surface porosity is defined as voids or pits on the surface of the parts. Porosity results form air or gases (e.g., mois-ture) that get trapped during compounding and molding processes or subsequent process stages.Blisters are porous regions that are concealed by thin skins at the surface. The skin prevents gas evacuation and causes bubbles on the surface of SMC parts, which pop up after subsequent painting and high temperature baking.

Paint-popping phenomenon that creates bubbles or sur-face porosity such as pinholes or craters may also appear on coated parts with powder priming.

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Jul 27 2016


Category: SMC mould makerAlice @ 3:03 am

Once the paste viscosity is sufficiently thickened to reach its forming plateau,the SMC can be compression molded inside a hot mold.For that purpose, hydraulic or mechan-ical presses can be used.Their loading capacity depends on the size of the part to be  molded (presses with a maximal load up to 40,000 kN can be used for the largest parts). Dedicated molds are mounted on these presses. They are made of cast, forged,or machined metals (usually steel). Their surfaces are hardened, polished, and at times, treated (chrome plated) Side cores, requirements for inserts, and other refinements can be added.The molds can be heated byusing preferably, a thermal fluid (steam, oil) that cir-culates inside the mold. Compared to standard heating systems (e.g., electrical heating cartridges), this solution can heat the mold and the SMC but it can also extract the additional heat that is released during the exothermic SMC curing. Various successive operations are required for compression molding, the second and fundamental step of the SMC process. Depending on the complexity of   the part to be produced, most of these operations can be robotized.

First, several sheets or charges are cut from the thick-ened SMC. Their carrier film is withdrawn, and sets of  2–10 charges are then stacked together. The surface of  the stacked charges usually occupies 30–70% of the total surface of the mold (mold surface coverage). The time required for this operation is concurrent and not taken into account in the compression molding cycling time:it is generally achieved during the curing of the previous compression-molded part (see below). Special care must be taken to cut, ply, and weigh the stacks respectively to their prescribed shape and weight: their weights must equal those of the final parts (for that purpose, and because of the possible thickness irregularity of compounded sheets,small pieces of charges are sometimes cut from the stacks or added to them) and their geometrical shapes are usually designed for optimized mold-filling conditions. It is also important to notice that the charge stacking can induce air entrapment between the charges: if not properly eliminated during compression molding, the entrapped air can be a possible source of residual and unfavorable pores  in produced parts.

Second, the stacked charges, initially and usually at room temperature, are then positioned onto the lower part of the compression-heated mold (130–160 ◦ C, depending on the resin to be cured). During this charge placement,which lasts approximately 10–20 s, particular attention must be paid to the positioning of the stacks in the mold:slight variations can induce drastic changes during mold filling.

Third, the heated mold is progressively closed at typical closing velocities usually ranging between 1 and 10mm/s.During the mold closing (duration: 1–10 s), the SMC charges are continuously heated and forced to flow within the mold cavity. Flow mechanisms occurring during this phase are closely related to the rheology and the ini-tial microstructure of SMC. They are very complex but they are essential, since they considerably affect the final microstructures of molded SMC parts (see the section titled ‘‘Mold-Filling Phase’’), and so their end properties.

Fourth, the mold is kept closed under high pressure (5–20MPa) for approximately 30 s–3min. Most of the curing reaction of the SMC paste occurs during this phase (see the section titled ‘‘Curing Phase’’).

After this curing, an in-mold coating (IMC) operation can be achieved [93] in order to erase surface defects that have been created during compression molding (sink marks, pores, etc.) and to form a primer-like surface before painting. This operation consists in opening the mold slightly and injecting and curing a coating compound onto  the external surface of the SMC.(WE DON’T DO IN-MOLD COATING(IMC),we cam do coating after we get parts.)

Lastly, the mold is opened and the cured part is ejected.It is then often positioned onto a cooling jig in order to complete the cooling while maintaining its geometry to defined dimensions. Thereafter, subsequent finishing operations are usually performed: deburring, polishing,insert placement, bonding, painting, and so on

Jul 22 2016

Major Advantages of SMC

Category: SMC mould makerAlice @ 1:17 am

SMC are versatile materials: their formulation can be adjusted and tailored to meet the requirements of adiverse range of applications. Compression molding of SMC allows

processing complex and large shapes on a rapid cycle time.Features such as inserts, ribs, bosses, and attachments can be molded in. This process needs little mold prepara-tion

and generates few scraps, thus reducing the cost of trimming operations. Good surface finishes are obtainable,contributing to lower part-finishing cost. This process can also be automated.

Compared, for instance, to steels, SMC provide design freedom and flexibility by accommodating shape complex-ity and geometric details; reduced manufacturing com-plexity through part integration in a single assembly; and combining structural, assembly, and integration functions (e.g., antennae embedment); substantial weight reduction (∼20–35% lighter than equivalent steel parts); superior corrosion resistance; and reduced tooling costs (40% less than tools for steel stamping). SMC also offer enhanced damage resistance from dents and dings, especially in exterior cladding (body panels), as compared to aluminum alloys and steels; good harshness properties; and good noise and vibration properties. The benefits of using SMC are also: in-mold coloring and powder priming for painted parts with the requirement of high temperature resistance from 150 to 200 ◦ C for e-coat application.

Compared with injection molded parts, particularly those produced using the BMC process, SMC parts have better mechanical properties. For instance, equivalent parts exhibit typically an average thickness of 2.5mm in the SMC case, whereas this thickness is about 3.5mm in the case of injection molded BMC to meet the same mechanical requirements. This is due to the highest length of the fibers used in SMC. Even if fibers having the same length can be used in both processes, it is known that injection processes have a clear tendency to damage the fibrous reinforcement resulting in a drastic length reduc-tion. This shows a limitation and an inefficiency in the injection processes. On the contrary, compression molding allows a lower freedom of design and complex geometry to be molded. This can be seen as an advantage when com-paring SMC with prepreg fabrics: the latter indeed offer higher mechanical properties, but the parts have simpler geometry.

For many applications, SMC compete with fiber-reinforced thermoplastic materials. Those materials can be injection molded or compression molded as GMT. SMC parts have better mechanical properties, heat resistance, better than usual dimensional stability and environmental resistance, and cost-effective thermoplastic composite parts. In contrast, fiber-reinforced thermoplas-tics generate fewer scraps than SMC, thus lowering labor costs. Furthermore, SMC have some disadvantages: the continuous thickening of the paste, the variations of the rheological properties, as well as the emission of styrene,which impacts the curing reaction, the variations of the basis weight, and the cooling of molding parts, which may induce some geometrical distortions if not controlled properly, still remain tricky to control at the industrial scale. But there is no clear trend yet that SMC will be replaced by composite thermoplastics. Indeed, assembly can be manufactured from a subset of parts. SMC can be used for the structural parts of the assembly, whereas visible skins can be composed of thermoplastic composites.This type of solution is currently implemented in the automotive industry. Nevertheless, painted SMC body panels are still being produced without major insoluble industrial problems.

Alice Chen
MOBILE PHONE:+8613989617789
Skype : alicechen40

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Jul 19 2016

Typical Applications Of SMC

Category: SMC mould makerAlice @ 2:13 am

Today,SMC used worldwide and represent a major part of the world’s thermoset composites.Globally,the compression molding of SMC is the third most intensively used technique for the production of polymer composite parts worldwide(behind the injection of reinforced thermoplatics and the hand lay-up techniques).It represents about 15% of the total of produced parts and of the total of materials used by the composite industry.

There is a large diversity of fields of applications for SMC.The automotive and truck inductries remain the drivers of the SMC technology,but SMC are commonly used in the  agricultural ,rail and marine(interior and body parts,watercraft parts,etc),electrical(low voltage and mdeium voltage energy systems,fuses and switchgear,cabinets and junction boxes,encapsulation of wirings and electronic circuits,electrical components with reduced surface resistivity,lamp housings) and energy(parts for wind turbine ciruits,electrical components with reduced surface resistivity, lamp housings) and energy (parts for wind tur-bine and solar power applications, etc.), sanitary (sinks and bath tubs, toilet seats, drain covers, etc.), domestic appliance (blower housings, drain pans, and heating, ven-tilation, and air conditioning (HVAC) systems, vent trims,parabolic mirrors, swimming pool panels, etc.), building and construction (drinking water tanks, panels, doors,etc.), and medical (surgery equipment, dental medication systems, antibacterial components) sectors.

In the automotive and truck industries, SMC parts are used notably in exterior and interior body panels,painted (class A parts) and unpainted, semistructural and structural parts (cf. Fig. 2). Basically, class A means that the surface finish has to exhibit an aspect of flatness,smoothness, and light reflection similar to that of stamped steels. A nonexhaustive list of automotive parts gives, for instance, bumpers, fenders, trunk divider, hood and door assemblies, deck lids, body panels, fenders, roof panels, spoilers, step assists, back panels, wheelhouses, firewalls,grilles, tailboards, cargo lids, stowage tubs, headlamp housings, and supports. More recently, high temperature underhood parts have been developed (e.g., valve covers).

SMC in aerospace are still rare. Nonetheless,allied with carbon fibers, SMC are penetrating the aeronautic indus-trial field for extra-wide-body commercial aircrafts (e.g.,large window frames, secondary structures, and interi-ors). Their performances are then between standard SMC and a quasi-isotropic laminate and meet the requirements of tight geometrical tolerances and weigh half as much as aluminum alloys. Finally, SMC are also spreading in sporting and leisure goods (bicycle components, etc.).

Alice Chen

MOBILE PHONE:+8613989617789
Skype : alicechen40

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Jun 29 2016

China Compression Moulds Manufacturer of SMC And BMC

Category: SMC mould makerAlice @ 8:10 am

As a professional compression moulds manufactuer of SMC,BMC,we can make Santitary Series SMC mould(bathroom suites,shower base,sink etc),Automotibe SMC mould(trucks,cars and caravan etc),Electrical & Electronic SMC mould (housings,fuses and switchgear etc),Building & Construction Industries (civil engineering and household fixtures)……

We focus on the  thermosetting plastic industry ,supplying SMC,BMC(DMC),GMT fiberglass moulds,and moulded parts.

We mainly provide follow services:

1.Mould design & mould manufactuers

SMC mould,BMC (DMC)  mould,GMT mould

2.Moulding of SMC,BMC,GMT products,small batch trial production,


Welcome to Ningguang Mould,We Supplying products of quality,durability and reliability,have high standard management system for making high quality SMC,BMC,GMT mould,our rich experiences will help you to buliding a high quality mould.

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Jun 27 2016

SMC Tooling,BMC Tooling,GMT Tooling

Category: SMC mould makerAlice @ 3:18 am

In the 2000′s Ningguang Mould began to design and manufacture tooling for SMC,BMC and GMT material.Since  that time,Ningguang can produced tooling for the production of automotive parts(front and rear bumper,dashboar,shell roof,floor,car door,spoiler,seat,engine cover etc),sanitary(SMC/BMC shower chassis,shower panel,SMC/BMC toilet seat,SMC/BMC sink,SMC/BMC washing basin,SMC/BMC bathtub,SMC/BMC ceiling,lavabo),SMC train window frame,SMC toilet assembly,SMC seat,roof sheet,electrical components,SMC motorcycle parts,SMC panel and many other products.

Tooling is usually designed with hydraulic cylinders with folw diverters for the ejection side.Many of the tools are polished to diamond finish and textured prior to chrome plating.The tools are either machined from high hard P20,heat treated H13 or 1.2738 to provide the longest life possible.

With more than 10 years of experience within the tooling industry,with focus on quality at an affordable.The focus of our operation is to supply our clients with quality SMC,BMC,GMT tooling and parts,conforming to the standards of our clients,to be reliable in terms of time and agreetments and a competitive price.

Whatever your SMC,BMC and GMT tooling needs,we have the design and manufacture capabilities to fullfil them,we are able to assemble parts for you and paint these to your requirements.

Alice Chen
MOBILE PHONE:+8613989617789
Skype : alicechen40

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Jun 17 2016

Plastic injection Family Molds Save Your Money

Category: plastic mould makerAlice @ 8:00 am

Plastic injection family molds offer an efficient and economic way to produce a set of different plastic part in a single mould,it produce a set of parts similar in size that are molded at the same time,in the same quantities,from the same material and color,usually built to save money on multiple part types.

Two different parts can be produce from a single mold.This can save on time and expenses by sharing common mold components such as the mold base,However,family molds are typically better suited for lower volume applications.

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Jun 16 2016

Two Types Of SMC Moulds,BMC Moulds

Category: SMC mould makerAlice @ 7:17 am

Ningguang Mould have many kinds of hydraulic press and oil temperature,in this case,we can produce SMC/BMC parts for you.So we give you choice for this SMC/BMC mould your get,depending on your part volume and how your parts will be made.


Production SMC/BMC moulds are built to high stand prodution volumes,we’ll maintain and repair(if necessary) your SMC/BMC mould at our cost for as long as we are making your part.


Sometims,our customer wants us manufacture the SMC/BMC mould for them,but they want to produce the parts by themselves or another facility.In this case,we will make the SMC/BMC  mould according to cllients standards and export it to them.Optionally,we can press as many parts as you need of your export mould beofre we ship it to you.This is the good choice to check the quality of our mould.

Alice Chen
MOBILE PHONE:+8613989617789
Skype : alicechen40

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Jun 16 2016

Tips For Injection Moulding Project

Category: plastic mould makerAlice @ 3:08 am

In order  to  get right injection mould,Here a few tips for your reference.

1.Choosing  material

It will help your mould maker if you konw what polymer you are using  before starting the mould. When you choosing  material for your injection moulded part,figure out what you needs,you can discuss with material representative,i think these guys will help you select a material that best meets your parts.If you decide on one  material,then don’t change your mind.Remember, it does not have to be the most expensive resin to be a quality material.

2.Selecting the right mould maker

There are many kinds of mould makers in China,some are very large,some are small.Just keeping in mind the requirements for your parts,select a mould maker that is capable.If your requirements are low,stay away from the big injection mould maker,their mould cost is very high.

3.Get the specification and design right in the beginning

Make sure you specify everything you want up front.Getting  the design optimised for injection moulding is probably the single most important thing.Describe intimately the function of the part and which parts need to fit together and how well they need to do that——if you are getting a drawing done,this will be set up as tolerances.The mould maker should have these to work to for mould structure drawing.If the mould maker have the spec up front,they should make a product that makes that part to how you want it.If you haven’t specced it before,sometimes this can be a painful process as you may end up with bill to pay making minor modification when the part hasn’t moulded correctly.

3. Choose appropriate steel

If you choose wrong steel,the part may get stuck in the mould,can’t eject properly.

If you are expecting 1000 part/year for 5 years then finish,a softer steel(like aluminium) will be recommended.

If you want running for over 15 years,and there’s no reason that if you choose a good grade of stool.Remember,the longer the mould runs,the more profitable it is.

What material you use will affect steel choice:for example,if you want to make parts in PVC,then we’d recommend a stainless steel mould due to it’s corrosive nature.

Alice Chen
MOBILE PHONE:+8613989617789
Skype : alicechen40

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