Xuzhou Zhengxin Glass Products Co.,Ltd. is one of the top glass bottle manufacturers in China. An industry and trade company integrating development, design, production, sales and trade. We offer bulk glass bottles in different shapes and sizes, including Uline Straight Sided Glass Jars, Straight Sided Glass Jars With Lids, Wide Mouth Straight Sided Glass Jars, Cram Jars With Crimp Tops, etc.
Why Choose Us
Production Capacity
We operate 16 cutting-edge glass bottle production lines and no fewer than 25 state-of-the-art furnaces. Our production capabilities allow us to accept large-volume orders year-round, offering a wide range of shapes, sizes, and colors.
Product Application
We have the expertise and capacity to serve a diverse range of industries and clients, including traders, perfumers, cosmetic companies, and food and beverage manufacturers.
Quality Control
All our products are meticulously manufactured in strict adherence to industry standards. We implement a comprehensive quality testing process throughout the entire production cycle.
Custom Service
To meet a variety of customer needs, we offer highly customizable services. If you have specific requirements or creative ideas, please feel free to reach out. Our team is always ready to work with you to create the ideal packaging solution for your products.
We offer stock and custom food grade glass jars in a variety of shapes, sizes and finishes. Choose from a large stock portfolio. glass jars are 100% recyclable.
Glass jar Size
|
Regular Mouth glass jar Size |
Ounces |
Cups |
Height |
Width @ Midpoint |
Straw Size |
|
Jelly Jar |
4 oz |
½ |
2 ¼" |
2 ¾" |
N/A |
|
Half Pint |
8 oz |
1 |
3 ¾" |
2 ⅜" |
Short |
|
Three Quarters Pint |
12 oz |
1½ |
5 ¼" |
2 ⅜" |
Medium |
|
Pint |
16 oz |
2 |
5″ |
2 ¾" |
Medium |
|
Quart |
32 oz |
4 |
6 ¾" |
3 ⅜" |
Long |
|
Wide Mouth glass jar Size |
Ounces |
Cups |
Height |
Width @ Midpoint |
Straw Size |
|
Half Pint |
8 oz |
1 |
2 ½" |
2 ⅞" |
N/A |
|
Pint |
16 oz |
2 |
4 ⅝" |
3″ |
Medium |
|
Pint and a Half |
24 oz |
2 ½ |
6 ⅝" |
3″ |
Long |
|
Quart |
32 oz |
4 |
6 ½" |
3 ¼" |
Long |
|
Half Gallon |
64 oz |
8 |
9 ⅛" |
4″ |
Extra Long |
Styles of Glass Jars
● Regular mouth glass jars
Regular mouth glass jars have a narrower opening, making them ideal for items like jams, jellies, and pickles. Their slender mouth size facilitates easy pouring and minimizes spills during filling.
● Wide mouth glass jars
Wide mouth glass jars feature a broader opening, making them suitable for canning larger items such as whole fruits, vegetables, and even soups.
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Silica sand or borax: The main component of silica sand or borax introduced into glass is silica or boron oxide, which can be separately melted into a glass body during combustion, which determines the main properties of the glass, correspondingly called silicate glass or boron. Acid salt glass.
Soda or Glauber's salt: The main component of soda and thenardite introduced into the glass is sodium oxide. In calcination, they form a fusible double salt with an acidic oxide such as silica sand, which acts as a flux and makes the glass easy to form. However, if the content is too much, the thermal expansion rate of the glass will increase and the tensile strength will decrease.
Limestone, dolomite, feldspar, etc.: The main component of limestone introduced into glass is calcium oxide, which enhances the chemical stability and mechanical strength of the glass, but the excessive content makes the glass crystallized and reduces heat resistance.
Broken glass: Not all new materials are used in the manufacture of glass, but 15%-30% broken glass is blended.
Collection of Raw Material
Natural raw materials are used for manufacturing of glass jars and glass jars for packaging. These raw materials are Silica and Soda lime.
Preparation of Batch
The batch is prepared on a grinding machine. Raw material, cullet (shredded glass pieces) and decolourisers / colourisers are ground finely in a grinder. The mixing of these ingredients is usually done in a mixer until a homogeneous mixture known as a batch or frit is obtained. Before being fed to the kiln, the batches are stored in large vertical silos. The batch is now taken for further process of melting in a furnace.
Melting in Furnace
The mixture continues to melt in a furnace heated to a temperature of about 1748 °C. The furnace operates 24 hours a day, 7 days a week and has a service life of approximately 1012 years. The raw material entering the furnace turns into glass containers in about a day. Molten glass is delivered to the forming machine through a series of distribution channels called forehearths. At the end of the forehearths, the flow of glass is cut into pieces that are tightly controlled by weight, shape and temperature.
Forming at Present
Manufacturing of glass jars is done by two methods: B&B (Blow and Blow) process and NNPB (Narrow Neck Press and Blow) process. Both processes involve cutting a stream of molten glass with a cutting blade at a temperature of about 1,050–1,200 °C to form a rigid glass cylinder commonly referred to as a gob.
Annealing
To ensure the strength of a newly formed glass vessel, it must be heat treated and subjected to controlled and uniform cooling in a tunnel kiln known as an "annealing lehr". This can take anywhere from 30 minutes to 2 hours. An annealing oven commonly known in the industry as a lehr heats the vessel to about 580°C and then cools it down for 20-60 minutes, depending on the thickness of the glass.
Coatings
Usually there are two surface coatings done on glass jars and glass jars. The first one is done before annealing, at the hot end and the other one happens at the cold end, right after annealing.
They are also coated to prevent the containers from sticking together as they move along the conveyor.
Quality Inspection Machines
The defects of glass containers can be of various different kinds. The glass can have small cracks called checks, and sometimes foreign objects called stones can penetrate the walls of the glass container.
Packaging
Glass containers are packaged differently. Once packed, new "in-stock items" are tagged, stored in a warehouse, and finally shipped.
For the design of a new glass jar that will uniquely reflect your image, the our teams will be by your side at every step:
● Collection and formalization of your requirements.
● Validation of the feasibility of your project by our development team.
● Production of samples to allow you to visualize and validate all the technical characteristics of the glass bottle.
● Validation of the technical drawing, control of the samples and formalization of the specification by the quality department.
● Production assistance and recommendations for the use of the glass bottles on bottling lines.
● Validation of the decoration project (our infographics studio makes any enhancements necessary).
● Production of a paper proof followed by a glass proof for the final validation of the decoration.
● Quality control of all the production steps.
● A quality manager is available during all the phases of the glass and decoration project.
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As one of the most professional glass jar manufacturers and suppliers in China, we're featured by quality products and good service. Please rest assured to wholesale bulk customized glass jar made in China here from our factory.
Glass Jar, Matte Black Cream Jar, Square Glass Spice Jars With Bamboo Lids