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What's the secret in the Starbucks Cat's Paw Cup?p
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What's the secret in the Starbucks Cat's Paw Cup?p

Views: 15     Author: Site Editor     Publish Time: 2019-02-28      Origin: www.fuchun-casting.com

Have you seen this cat paw cup circulating on the internet recently?

Starbucks China launched this unique double-walled glass cup today.

The merchandise has been making the news for causing chaos among customers who fought over it.After seeing the design, we can understand why people are going crazy.

The outer layer is a regular cup, but the inner layer is in the shape of a cat paw reaching for the bottom.The paw could belong to any furry animal, but it makes us think of tubby little cat paws kneading.



So, we have a question: how is such a "strange shape" cup made?


First, let's analyze the cat's paw cup. If it's an ordinary open cup, it's easy to make. Direct Die Stamping can be formed at one time. However, this shape of inner glass of is the cat's paw. If the cat's paw is stamped, the mold can not be pulled out. So what exactly should we do?


I think it's about the same way as making double-wall vacuum mug.Like the following:


1The liquid glass falls into the conical die to make an inverted conical bottle. The outer side of the conical bottle is an inverted triangle formed by the die, and the cylinder in the middle is also part of the die. This hollow is used to blow the bottle in the next die.

2Put the conical bottle in the new mould and blow the high-pressure air directly into the bottle with the industrial air jet. It will blow out a wine cup. If you want to make a cat's paw shape, you just need to change the mold of the cat's paw.

3One of the difficulties in the processing of double glasses is the merging of outer glasses and inner glasses.

Because of the machinability of glass, it's enough to be heated! The upper part of the opening of the bottle is clamped by the manipulator arm, and the middle part is heated by a high temperature open fire. Once pulled, the bottle is disconnected. When the glass is broken by firing, the glass mouth is melted and sealed.

4The manufacturing process of double glasses is nested. The left and right chucks fix the inner and outer single-layer glasses, and then straddle together.

5After nesting, the rotational speed of the two chucks keeps the same, holding the inner and outer glasses with friction force respectively, so as to make the big cup cover the small cup. At this time, there is a certain distance between the two layers of glass, using high-temperature melting cup at the mouth of the two layers of glass, gradually melting together, slowly to achieve "seamless"

6、If the inner cavity of the laminated glass is sealed first, the heated air will easily crack as soon as it expands. Therefore, the bottom of the large cup is often not sealed, leaving a hole or a tube, after the double-layer merger before starting to seal.

7、Finally, the finished glass should be tempered to eliminate the internal stress caused by concave moulding and prevent bursting.

Video source:https://www.youtube.com/watch?v=GcdElyR7Ru4



  • What is 'multiple certification'?

    This is where a batch of steel meets more than one specification or grade. It is a way of allowing melting shops to produce stainless steel more efficiently by restricting the number of different types of steel. The chemical composition and mechanical properties of the steel can meet more than one grade within the same standard or across a number of standards. This also allows stockholders to minimise stock levels.

    For example, it is common for 1.4401 and 1.4404 (316 and 316L) to be dual certified - that is the carbon content is less than 0.030%. Steel certified to both European and US standards is also common.

  • What surface finishes are available on stainless steels?

    There are many different types of surface finish on stainless steel. Some of these originate from the mill but many are applied later during processing, for example polished, brushed, blasted, etched and coloured finishes.

    The importance of surface finish in determining the corrosion resistance of the stainless steel surface cannot be overemphasised. A rough surface finish can effectively lower the corrosion resistance to that of a lower grade of stainless steel.

  • Can I use stainless steel at high temperatures?

    Various types of stainless steel are used across the whole temperature range from ambient to 1100 deg C. The choice of grade depends on several factors:

    1. Maximum temperature of operation
    2. Time at temperature, cyclic nature of process
    3. Type of atmosphere, oxidising , reducing, sulphidising, carburising.
    4. Strength requirement

    In the European standards, a distinction is made between stainless steels and heat-resisting steels. However, this distinction is often blurred and it is useful to consider them as one range of steels.

    Increasing amounts of Chromium and silicon impart greater oxidation resistance. Increasing amounts of Nickel impart greater carburisation resistance.

  • Can I use stainless steel at low temperatures?

    Austenitic stainless steels are extensively used for service down to as low as liquid helium temperature (-269 deg C). This is largely due to the lack of a clearly defined transition from ductile to brittle fracture in impact toughness testing.

    Toughness is measured by impacting a small sample with a swinging hammer. The distance which the hammer swings after impact is a measure of the toughness. The shorter the distance, the tougher the steel as the energy of the hammer is absorbed by the sample. Toughness is measured in Joules (J). Minimum values of toughness are specified for different applications. A value of 40 J is regarded as reasonable for most service conditions.

    Steels with ferritic or martensitic structures show a sudden change from ductile (safe) to brittle (unsafe) fracture over a small temperature difference. Even the best of these steels show this behaviour at temperatures higher than -100 deg C and in many cases only just below zero.

    In contrast austenitic steels only show a gradual fall in the impact toughness value and are still well above 100 J at -196 deg C.

    Another factor in affecting the choice of steel at low temperature is the ability to resist transformation from austenite to martensite. 

  • Is stainless steel non-magnetic?

    It is commonly stated that “stainless steel is non-magnetic”. This is not strictly true and the real situation is rather more complicated. The degree of magnetic response or magnetic permeability is derived from the microstructure of the steel. A totally non-magnetic material has a relative magnetic permeability of 1. Austenitic structures are totally non-magnetic and so a 100% austenitic stainless steel would have a permeability of 1. In practice this is not achieved. There is always a small amount of ferrite and/or martensite in the steel and so permeability values are always above 1. Typical values for standard austenitic stainless steels can be in the order of 1.05 – 1.1. 

    It is possible for the magnetic permeability of austenitic steels to be changed during processing. For example, cold work and welding are liable to increase the amount of martensite and ferrite respectively in the steel. A familiar example is in a stainless steel sink where the flat drainer has little magnetic response whereas the pressed bowl has a higher response due to the formation of martensite particularly in the corners.

    In practical terms, austenitic stainless steels are used for “non-magnetic” applications, for example magnetic resonance imaging (MRI). In these cases, it is often necessary to agree a maximum magnetic permeability between customer and supplier. It can be as low as 1.004.

    Martensitic, ferritic, duplex and precipitation hardening steels are magnetic.

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