Plastic jars are small plastic containers that are used for storage or for the distribution of small quantities of products. They are similar to plastic bottles in that they are generally small, but a plastic jar is distinct from a plastic bottle because of its larger opening. This feature makes jars more practical than bottles in certain applications. Because of their small size and light but durable construction, plastic jars are an excellent material for storing and shipping food products.
Related Categories

Processed foods and condiments that are not eaten by themselves are especially suited to jars with wide openings because of the ease of access they provide for consumers and food service industry professionals. Their lightness and durability also makes them attractive to distributors and suppliers because of their resistance to becoming damaged in transit or because of exposure to uncontrollable climate conditions. Cosmetics, hygiene products and a wide variety of other consumer products are packaged using plastic jars. They are an inexpensive alternative to glass, which is especially vulnerable to becoming damaged in transit. Many plastic jars are also recyclable or reusable depending on the composition of the raw materials from which they are constructed.
Plastic jars, like many plastic containers, are manufactured by a process called blow molding. The process begins with a collection of raw plastic resin, which is called stock. The stock is loaded into a hopper that directs the stock into a conveyance channel. A long screw in that conveyance channel moves the stock through the channel toward the mold. Along the way, the pressure and friction caused by the turning screw in conjunction with heating elements placed along the conveyance channel heat the stock to a liquid state. At this point, the stock is forced into the mold cavity. As the liquefied plastic takes the shape of the mold, compressed air is forced into the mold; this creates a hollow recess in the middle of the product. Once the plastic has taken the desired shape, it is allowed to cool and harden. Then it is ejected from the mold, cleansed of imperfections (if they are present) and either shipped to the customer or sent for additional processing. Because of the modularity of the blow molding process, blow molds can be designed in almost any shape or size, which allows for the construction of plastic jars in almost any shape or size.