There are lost plastic chairs for indoor or outdoor use. Plastic chairs are injection molded using a plastic chair injection molding machine. An injection molding machine is a piece of equipment that processes thermoplastic plastic through a chair mold. Plastic chair is injection molding furniture, plastic injection molded chairs are widly using. Before using an injection molding machine to process the plastic raw materials, a plastic chair mould of different shapes must first be customized. The plastic chair product is then produced by injecting the thermoplastic material through the injection molding machine into the custom chair mould. How to choose a plastic chair injection molding machine, is the question.
Haichen can supply a plastic chair injection molding machine that produces plastic chairs in a variety of shapes by changing molds. Plastic chairs are produced directly by injection molding machines. Plastic chairs are usually made of PP, PC, or ABS material. The plastic chairs produced are small in size, light in weight, impact-resistant, and durable. Haichen not only provides injection molding machines but also supports customized plastic chair molds and can be configured with different kinds of auxiliary machines.
Plastic chair injection molding machines vary in size, design, and shape. Different sizes of chairs such as benches, adult chairs, and beach chairs, each have different dimensions and weights and will require different plastic chair injection molding machines to achieve production goals.
Plastic Chair
A “chair” is a piece of injection molding furniture for everyday life, a seat with a backrest and armrest, and it comes in many styles.
The material of chair
There are also many different materials for plastic chairs, generally speaking, there are two main types of PP and PC.
The types of chair
There are various types of plastic chairs, which can be classified into the following categories based on their different designs and uses:
Sports facility seats:
This chair normally withouot arm, just the seats, in the stadium.
Plastic seats:
There are three styles of seats: no backrest, 25cm high backrest, and 32cm high backrest;
Plastic chairs in modern furniture:
Various chairs made of thermoplastic materials. PP chair with or without armrests
Office chair:
A revolution in ergonomics technology. Also known as ergonomic chair
Other types:
There are also some plastic stools made of aged plastic material that are sturdy, durable, and easy to clean.
These different types of plastic chairs have their own characteristics in design, materials, and usage, meeting the needs of various scenarios.
Plastic Chair Production—injection molding machine
The production of plastic chairs requires the use of a machine—injection molding machine.
How are chairs produced by injection molding machines?
Firstly, use an automatic feeding machine to add plastic raw material into the injection molding machine and melt them into a uniform resin through electric heating; Then, the molten material is injected into the closed mold cavity using a nozzle, and the mold is indirectly cooled by circulating cooling water to solidify and form the plastic parts
To produce relatively large furniture such as chairs, we need to use injection molding machines with relatively large tonnage to produce, generally ranging from 600 tons to 1850 tons.
These are the individual components and components of an injection molding machine, but we understand them simply that the injection molding machine can be summarized into two parts, the machine, and the mould, to complete the production action, the machine needs to melt the raw materials( PP or PE), and then squeeze them into the mould in the machine, and finally close the mould, so that the chair is formed, and finally open the mould, take out the chair, this is the complete production process.
That is, if you want to produce chairs, you need an injection molding machine, as well as the relative mould.
Injection Molding Chair Design
We provide injection molding chair design services for customers. Whether it is a plastic office chair or a molded dining side chair we will bring your design ideas to reality. Our creative team will work with you to come up with a production design template that matches your needs.
Furniture such as injection molding chairs is larger than ordinary molded parts. As a result, they require large, but very precise molds. Our injection mold designers will make sure that its dimensions match the dimensions of the mold design when designing, and consider production issues, such as the surface finish of the injection molding chair.
Overview of the Plastic Chair production progress.
Case Study: Step-by-Step Production Process for Plastic chair
5 stpes to produce one chair by injection molding machine:
1. Pre-Drying:
Different materials (PP PC) need to be dehumidified before further processing, here we use dryers or integrated drying and dehumidifying loaders.
2. Colour mixing:
Colors are added to each raw material using a color mixing machine.
3. injection moulding:
The finished colors are put into the injection molding machine and molded together according to different settings and matching moulds.
4. Cooling:
Precise cooling control after each cycle will determine the quality of the finished plastic chair. We use an air-cooled cooler for this process, and in addition, you can choose precise mould temperature control.
5. Inspection and quality control:
Arrange the chair and wait for subsequent packaging.
Plastic Chair Mould
Plastic chairs of different sizes and shapes can be customized by corresponding injection moulds. The injection mould is mainly composed of two parts, including the fixed (fixed) and movable (ejector) halves of the mould, so the mould has two pieces.
The fixed part of the mould is installed on the fixed plate of the injection molding machine; The ejector part of the mould is fixed to a movable fixing plate that contains an ejector for the finished plastic chair, which means that after the injection molding machine has finished production, the chair will automatically fall off the mould without having to be manually removed.
Especially for complex plastic chair moulds, not only must there be excellent processing equipment and professional mould manufacturing employees, but also excellent chair mould design.
To avoid unnecessary cumbersomeness in the casting production of plastic chairs, the producer should conduct a full analysis of the chairs, about the geometric characteristics, size, and aesthetic requirements of plastic chairs.
Even chairs of the same material, but different sizes and styles, require a separate mould to produce.
How to choose the machine according to a chair
700 ton injection molding machine for The PP chair with arm;
1200 ton injection molding machine for PC chair.
When choosing an injection molding machine for producing plastic chairs, two main factors should be considered:
- size of plastic chair
- Mobility of raw materials
size of plastic chair
The first step of the matching machine is to confirm the size of the chair, because the mould is to be placed in the injection molding machine for production, so the size of the mould can not exceed the spacing of the injection molding machine tie rod, otherwise, the mould can not be placed in the injection molding machine, and the production cannot be carried out.
If the size of the mould is not equal to the size of the chair, according to the actual situation, the length, width, and height of the mould will be tens of centimeters larger than the length, width, and height of the chair.
Mobility of raw materials
In addition to the size of the chair, the most important aspect of the selection of the injection molding machine is the fluidity of the material.
Let’s use two chairs of different materials but both same size
As an example:
The first one is a chair made of PE material, and the second is a chair made of PC material
In practical applications, PP is the most conventional material, and PC material has fast fluidity but is easier to solidify, so it requires a larger injection rate and pressure to inject, so it will also need a larger clamping force to cooperate to ensure that the product will not produce flash.
Therefore, in the production of a 556x543x800mm plastic chair, we choose HCK700. PC has high transparency and high hardness of the finished product, and in the case of the same size, we will need HCK1000 to produce PC seats.
Other issues about injection molded chair
More detailed plastic chair production line options
1. The backrest of the plastic chair has many different patterns. In actual production, we can design detachable metal plates for these backplates separately.
So that manufacturers do not need to buy separate whole moulds for each chair with a different backrest. But only need to replace their backplates, and you can get a different chair.
2. Since plastic chairs are large-volume plastic products, unlike small products, multi-cavity moulds can be used.
So each plastic chair injection molding machine can only be matched with a cavity mould. And to produce one chair in one injection cycle.
And manufacturers can purchase machines according to their actual conditions.
3. If you are a novice and are more concerned about the initial cost, you can only replace different injection molded parts (screw barrels) at the same time as different mould parts.
Such production can only obtain one type of part for some time, and the total production rate will be determined by the total number of parts.
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